ࡱ> 6 F_ ҡbjbj bbO/ Q) 2dOdO\.\$X_X_X_ccc kpc(t 6n d\)$$r)X_]@]])]]   ]+]X_F ]  >8:^"^Y|T20("4 ""X_p: ʶt>ppp))  ppp(]]]]"pppppppppdO [: Section 3: Power System Generation and Delivery Equipment Generators Classification of generator applications (Buff 12.2) Single-isolated generators (Buff 12.2) Single-isolated generators are used to supply emergency power or for standby service and are normally shut down. They are operated for brief periods when the normal source fails or during maintenance, testing, and inspection. They are connected to the system load through an automatic transfer switch or through interlocked circuit breakers and are not operated in parallel with other system power sources. They are driven by diesel engines or gas turbines with ratings from less than 100kW up to a few megawatts. Generation is usually at utilization voltage level, typically 480V or 480Y/277V, but with larger machines the voltage may be 2.4kV or 4.16kV. These generators are designed to start, operate during a power failure, and to shut down when normal power is restored through automatic controls. Multiple-isolated generators (Buff 12.2) A multiple-isolated generator application consists of several units operating in parallel without connection to any electric utility supply system. Examples of these installations are total energy systems for commercial and industrial projects, offshore platforms for drilling and production of energy sources, and other remote sites requiring continuous electric energy. The size of the individual generators may range from a few hundred kilowatts up to several megawatts depending on the system demand. The prime movers are typically gas turbines and oil-, gas-, or diesel-fueled engines. These systems are normally operated manually, but load-sensing controls and automatic synchronizing relays can be used. The rated voltage of these generators is usually at the utilization voltage or the highest distribution voltage level, or both, such as 4.16kV or 13.8kV. Figure REF RTF33343937373a204669675469 \hError! Reference source not found. shows a typical installation where generators are connected directly to a distribution system. If the system is effectively grounded (X0/X1 3, R0/X1 1), the generator neutral (or the neutral of the bus-grounding transformer if the generator neutral is isolated) is grounded with a neutral inductive reactance. If the system is not effectively grounded, as for some three-wire distribution systems, the generator neutral or grounding-transformer neutral is generally grounded through a low-ohmic-value resistor.  Large industrial generators (Buff 12.2) Large industrial generators are bulk power-producing units that operate in parallel with an electric utility supply system. All generated power is normally utilized by the industrial user. These units are used where a demand exists for low-pressure process steam, such as in petrochemical installations and in pulp and paper plants. The generator size may range from 10000kVA to 50000kVA. Operation is continuous at or near rated load, but may vary seasonally. The prime movers are usually steam or gas turbines depending on the process requirements, fuel availability, and system economics. Generation is usually at the highest voltage level, typically 12.47kV or 13.8kV, of the industrial plant systems. The majority of these machines are operated by attendants. Figure REF RTF32383739303a204669675469 \hError! Reference source not found. illustrates how to connect two or more generators to a system using one step-up transformer. Two or more generators are bussed at generator voltage and a two-winding grounded wye-delta unit transformer is used to connect the machines to the system. These approaches may be used with thermal, hydro, or combustion-turbine generators. Low-resistance grounding of the generators would be used in order to achieve selective ground-fault protection for the machines. In some instances, the generators may be high- resistance-grounded through a distribution transformer in order to minimize destructive iron-burning damage due to phase-to-ground faults. High-resistance grounding for multiple machines has the disadvantage that it does not provide sufficient current for selective relaying. To overcome this problem, a combination of zero-sequence voltage and directional ground-fault protection would need to be provided. Unit generator-transformer configuration (Buff 12.2) In a unit generator-transformer configuration, a generator and its transformer (or unit transformer) are connected as a unit to the system as shown in Figure REF RTF31343033383a204669675469 \hError! Reference source not found.. The generator is usually wye-connected and high-resistance-grounded through a distribution transformer. The unit transformer is most commonly a grounded wye-delta connection. The unit auxiliary transformers may be either two-winding or three-winding transformers, depending upon the size of the generator unit. In most instances, each unit auxiliary transformer is connected delta-wye with the neutral of the wye connected to ground through some impedance. Cogeneration generators (Buff 12.2) Cogeneration is the simultaneous production of several forms of energy. Usually cogeneration involves the production of electric power and process steam within the plant. The Public Utilities Regulatory Act of 1978 (PURA) empowered the Federal Energy Regulatory Commission (FERC) to provide rules requiring electric utilities to buy power from or to sell power to cogeneration operators. When the generated power exceeds the plant demand, the excess power flows out to the electric utility. Historically, power only flowed into the industrial plant. This power flow in either direction significantly impacts the electrical protection at the intertie between the utility and the industrial, but has only minor significance for the generator protection. Induction generators (Buff 12.2) An induction generator is physically the same machine as an induction motor. The induction generator is operated slightly above synchronous speed rather than below as for an induction motor. It takes its excitation from the power system. Induction generators are subject to overspeed conditions on load rejection. The three-phase fault contribution from an induction generator duration is short compared to a synchronous generator. Additional electrical protection functions may be required in the interconnection (i.e., over and under voltage). Generator grounding (Buff 12.4) A common practice is to ground all types of generators through some form of external impedance. The purpose of this grounding is to limit the mechanical stresses and fault damage in the machine, to limit transient voltages during faults, and to provide a means for detecting ground faults within the machine. A complete discussion of all grounding and ground protection methods can be found in IEEE StdC37.101-1993 and IEEE StdC62.92-1989. The following methods, most commonly used for industrial generator grounding, are discussed in this chapter: High-resistance grounding Low-resistance grounding Reactance grounding Grounding-transformer grounding Solid grounding of a generator neutral is not generally used because this practice can result in high mechanical stresses and excessive fault damage in the machine. According to ANSI C50.13-1989, the maximum stresses that a generator is normally designed to withstand are associated with the currents of a three-phase fault at the machine terminals. Because of the relatively low zero-sequence impedance inherent in most synchronous generators, a solid phase-to-ground fault at the machine terminals produces winding currents that are higher than currents for a three-phase fault. Therefore, to comply with ANSI C50.13-1989, generators should be grounded so that the maximum phase-to-ground fault current is limited to a magnitude equal to, or less than, the three-phase fault current. Generators are not often operated ungrounded. While this approach greatly limits the phase-to-ground fault currents and consequently limits damage to the machine, it can produce high transient overvoltages during faults and also makes it difficult to locate the fault. High-resistance grounding (Buff 12.4) In high-resistance grounding, a distribution transformer is connected between the generator neutral and ground, and a resistor is connected across the secondary. The primary voltage rating of the distribution transformer is usually equal to or greater than rated generator line-to-neutral voltage, while the secondary winding rating is 120V or 240V. The secondary resistor is selected so that, for a single phase-to-ground fault at the generator terminals, the power dissipated in the resistor is equal to or greater than three times the zero-sequence capacitive kilovoltampere to ground of the generator windings and of all other equipment that may be connected to the machine terminals. The calculation for sizing the resistor R utilizes the phase-to-ground capacitance Xco in the generator, bus, cable, transformers, and surge device. The resistor is sized to be  Because the resistor is in parallel with the distributed capacitance, the total zero-sequence current is greater than the capacitive charging current. With this resistor rating, the transient overvoltages during faults are kept to safe values. For a single phase-to-ground fault at the machine terminals, the primary fault current is limited to a value in the range of about 3A to 25A. If possible, the ground-fault current level should be chosen to coordinate with the primary fuses (when used) of wye-wye-connected VTs with grounded neutrals. Distribution transformers with internal fuses or circuit breakers should not be used. They could inadvertently be open, and the grounding and protection scheme could be inoperative at the time of fault. In some cases, the distribution transformer is omitted, and a high value of resistance is connected directly between the generator neutral and ground. The resistor size is selected to limit ground-fault current to the range of 5A to 10A. While this method of grounding is used in Europe, the physical size of the resistors, the required resistor insulation level, and the cost may preclude the use of this method. High-resistance grounding does not provide sufficient current for selective ground relayingof several machines connected to a common bus. Consequently, it is generally used with unit-system installations where a single generator is connected through its individual primary grounded wye/secondary delta step-up transformer (or transformers) to the system. In a few cases, this type of grounding has been used when two or more generators are connected to one step-up transformer. However, with such a system, coordinating ground-fault protection is difficult, and shutting down all machines may be required to isolate a fault. Low-resistance grounding (Buff 12.4) In low-resistance grounding, a resistor is connected directly between the generator neutral and ground. The resistor is selected to provide sufficient current for selective ground relaying of several machines or feeders, or both. In general, the grounding resistor is selected to limit the generators contribution to a single phase-to-ground fault at the generators terminals to a value in the range of 200 A to 400 A. Resistor cost and size usually preclude the use of resistors to limit the current below 200 A or to permit currents above machine-rated current. Low-resistance grounding is generally used where two or more generators are bussed at generator voltage and connected to a system through one step-up transformer or where the generator is connected directly to a distribution system having a low-impedance-grounding source on the generator bus. The disadvantage of this method is that these values of ground-fault current may cause serious generator stator iron damage. Reactance grounding (Buff 12.4) Reactance grounding uses an inductive reactance between the generator neutral and ground. The inductive reactance is selected to produce an X0/X1 ratio at the machine terminals in the range of 1 to 10. A common practice is to maintain an effectively grounded system by keeping the X0/X1 ratio at 3 or less. This method of grounding produces relatively high levels of phase-to-ground fault currents ranging from approximately 25% to 100% of the three-phase fault current. Reactance grounding is generally used where the generator is connected directly to a solidly grounded distribution system. Grounding-transformer grounding (Buff 12.4) Grounding-transformer grounding involves the use of a grounding transformer connected to the machine terminals or to the generator bus. The grounding may be provided by a zigzag transformer, by a grounded wye-delta transformer, or by a grounded wye-broken-delta transformer with a resistor connected across a corner of the broken delta. When a zigzag or a grounded wye-delta transformer is used, the effective grounding impedance is selected to provide sufficient current for selective ground relaying. The grounded wye-broken-delta transformer with a resistance in the corner of the broken delta is generally a high-resistance-grounded system. The resistance would be selected in the same manner as for the distribution transformer with secondary resistor. This method limits the single phase-to-ground fault current to a range of 3primaryA to 25primaryA. A zigzag or grounded wye-delta transformer may be used as an alternate grounding source when a generator with neutral reactor grounding is connected directly to a distribution system. This approach can also be used where several ungrounded wye- or delta-connected generators are bussed at generator voltage. A grounded wye-broken-delta transformer with a resistor across the corner of the broken delta may be used to provide a means for detecting ground faults in ungrounded wye- or delta-connected generators. Transformers Transformers (Red 10.4) Classifications (Red 10.4) Transformers have many classifications that are useful in the industry to distinguish or define certain characteristics of design and application. Some of these classifications are described in the following subclauses. Distribution and power (Red 10.4) These are two classifications based on the rating of transformers measured in kilovolt- amperes. The distribution type covers the range of 3 to 500 kVA; the power type covers all ratings above 500 kVA. Transformer Types (Grey 5.2) The following types of transformers are normally used in commercial buildings: Substation Primary-unit substation Secondary-unit substation (power center) Network Pad-mounted Indoor distribution Many other types of transformers are manufactured for special applications, such as welding, constant voltage supply, and high-impedance requirements. Discussion of the special transformers and their uses is beyond the scope of this recommended practice. Substation Transformers Used with outdoor substations, they are rated 750-5000 kVA for single-phase units and 750-25 000 kVA for three-phase units. The primary voltage range is 2400 V and up. Taps are usually manually operated while de-energized; but automatic load tap changing may be obtained. The secondary voltage range is 480-13 800 V. Primaries are usually delta connected, and secondaries are usually wye connected because of the ease of grounding the secondary neutral. The insulation and cooling medium is usually liquid. High-voltage connections are on cover-mounted bushings. Low-voltage connections may be cover-mounted bushings or an air terminal chamber. Primary-Unit Substation Transformers Used with their secondaries connected to medium-voltage switchgear, they are rated 100010 000 kVA and are three-phase units. The primary voltage range is 6900 138 000 V. The secondary voltage range is 240034 500 V. Taps are usually manually changed while de- energized; but automatic load tap changing may be obtained. Primaries are usually delta connected. The type may be oil, less-flammable liquid, air, dry, cast-coil, or gas. The high-voltage connections may be cover bushings, an air terminal chamber, or throat. The low-voltage connection is a throat. Secondary-Unit Substation Transformers Used with their secondaries connected to low-voltage switchgear or switchboards, they are rated 112.52500 kVA and are three-phase units. The primary voltage range is 240034 500 V. The taps are manually changed while de-energized. The secondary voltage range is 120480 V. The primaries are usually delta-connected, and secondaries are usually wye connected. The type may be oil, less-flammable liquid, air, dry, cast-coil, or gas. The high-voltage connections may be cover bushings, an air terminal chamber, or throat. The low-voltage connection is a throat. Network Transformers Used with secondary-network systems, they are rated 3002500 kVA. The primary voltage range is 4 16034 500 V. The taps are manually operated while de-energized. The secondary voltages are 208Y/120 V and 480Y/277 V. The type may be oil, less-flammable liquid, air, dry, cast-coil, or gas. The primary is delta connected, and the secondary is wye-connected. The high-voltage connection is generally a network switch (on-off-ground) or an interrupter-type switch with or without a ground position. The secondary connection is generally an appropriate network protector, or a low-voltage power air circuit breaker designed to provide the functional equivalent of a network protector. ANSI C57.12.40-1990, Requirements for Secondary Network Transformers, Subway and Vault Types (Liquid Immersed) [6] applies to liquid immersed, subway- and vault-type network units. A subway-type unit is suitable for frequent or continuous operation while submerged in water; a vault-type unit is suitable for occasional submerged operation. Pad-Mounted Transformers Used outside buildings where conventional unit substations might not be appropriate, and are either single-phase or three-phase units. Because they are of tamper-resistant construction, they do not require fencing. Primary and secondary connections are made in compartments that are adjacent to each other but separated by barriers from the transformer and each other. Access is through padlocked hinged doors designed so that unauthorized personnel cannot enter either compartment. Where ventilating openings are provided, tamper-resistant grills are used. Gauges and accessories are in the low- voltage compartment. These units are rated 75-2500 kVA. The primary voltage range is 240034 500 V. Taps are manually changed while de-energized. The secondary voltage range is 120480 V. Primaries are almost always delta connected or special construction wye connected, and secondaries are usually wye connected. A delta-connected tertiary is not acceptable with a three-legged core unless an upstream device opens all three phases for a single-phase fault. The type may be oil, less-flammable liquid, air, dry, cast-coil, or gas. The high-voltage connection is in an air terminal chamber that may contain just pressure- or disconnecting-type connectors or may have a disconnecting device, either fused or unfused. The connections may be for either single or loop feed. The low-voltage connection is usually by cable at the bottom; but it may also be by bus duct. The dry-type, pad-mounted transformer does not have the inherent fire hazards of the oil filled, pad-mounted transformer and frequently the dry-type, pad-mounted transformer is mounted on the roofs of buildings so that it will be as near to the load center as possible. ANSI C57.12.22-1989 [5] applies to oil immersed units with primary voltages of 16 340 V and below. Indoor Distribution Transformers Used with panelboards and separately mounted, they are rated 1 - 333 kVA for single-phase units and 3-500 kVA for three-phase units. Both primaries and secondaries are 600 V and below (the most common ratio is 480-208Y/120V). The cooling medium is air (ventilated or nonventilated). Smaller units have been furnished in encapsulated form. High- and low-voltage connections are pressure-type connections for cables. Impedances of distribution transformers are usually lower than those of substation or secondary-unit substation transformers. Indoor and outdoor distribution transformers are also available at primary voltages of up to 34 500 V and 150 kV basic impulse insulation level (BIL). The majority of transformers for distributing power at 480 V in a commercial building are usually referred to as "general-purpose transformers" and secondaries are typically rated at 208Y/120 V. These transformers are mostly of the dry-type, and some of the smaller sized ones are encapsulated. General-purpose transformers are used for serving 120 V lighting, appliances, and receptacles. Virtually all power transformers used in commercial buildings are of the two-winding type, which may be referred to as isolating or insulating transformers, and are distinct from the one-winding type known as the autotransformer. The two-winding-type transformer provides a positive isolation between the primary and secondary circuits; which is desirable for safety, circuit isolation, reduction of fault levels, coordination, and reduction of electrical interference. There are also a number of "specialty transformers" used for applications, such as x-ray machines, laboratories, electronic equipment, and special machinery applications. The health care applications are described in detail in IEEE Std 602-1986, IEEE Recommended Practice for Electric Systems in Health Care Facilities (ANSI) [30].47 Specialty transformers used in applications where the least amount of leakage current could cause an arc and ignite the atmosphere (such as in an oxygenated environment) or cause personal injury (such as in open heart surgery) will require an ungrounded secondary. In the most sensitive applications, the leakage current may be monitored and is controlled by introducing a grounded shield between the primary and secondary coils. Such a shield also reduces electromagnetic interference (EMI), which may be present in the primary. K-factor-rated transformers Transformers are subjected to nonlinear, nonsinusoidal (harmonic) currents from loads caused by equipment such as computers, copiers, fax machines, electronic ballasts, high- intensity discharge lighting, rectifiers, uninterruptible power supply systems, induction furnaces, welders, overhead cranes, and adjustable frequency drives. Transformers serving nonlinear loads exhibit increased winding (eddy current) losses that can cause overheating due to harmonic currents generated by these loads. Voltage harmonics can also cause additional losses in the core, but in most practical cases the harmonic-current-related winding losses are the limiting factor affecting a transformer's capacity. Skin effect also can play a role at high frequencies and larger diameter conductors, but is not considered practical in most 60 Hz power system applications. Those harmonic currents that are multiples of three, such as third, sixth, ninth, etc., are called triplen harmonics. When triplen harmonics are present in the phase conductors of a three- phase system, they add together in the neutral conductor. In the case of third harmonics, the result is a high 180 Hz current flowing through neutral cables, panelboard neutrals, and transformer neutral terminals. Thus, transformers expected to supply nonlinear loads should be oversized by a factor depending upon the severity of the harmonics. Since many loads today exceed the harmonic-current limit of 0.05 per unit specified for "usual service conditions" of liquid and dry transformers as specified in both IEEE Std C57.12.00-1987 [B32] and IEEE Std C57.12.01-1989 [B33], IEEE Std C57.110-1986 [B39] was developed. This guide establishes a method for evaluating the effects of the higher eddy current loss on the heating of transformer windings. An equation presented in IEEE Std C57.110-1986 includes a tabulation of the per-unit current squared times the frequency squared that, when summed up for each harmonic, produces a value referred to as the K-factor. The K-factor is related to the eddy-current loss in the winding conductors. Transformer manufacturers have units to supply nonlinear loads, while remaining within specified temperature limits. Those transformers are given K-factor ratings. It should be noted that K-factor-rated transformers do not eliminate harmonics any more than does a standard unit. K-factor ratings of 4, 13, 20, 30, 40, and 50 are available, with the higher K-factor ratings indicating an ability to handle progressively more harmonic current. K-rated transformers should be used whenever the load being served might contain any appreciable percentage of nonlinear loads. In addition to dealing with the effects of harmonic currents, new technology is being employed to limit voltage harmonics that occur in power transformers. Depending upon the design of the standard transformer, voltage distortion does occur. While a supply voltage may have a voltage harmonic distortion of as low as 1%, a secondary output voltage may have a voltage distortion of from 3% or greater. Transformers manufactured to deal with harmonic currents and carry K-factor ratings are built to the following specifications: Eddy current losses are held to a minimum; The core is designed for low flux density; Neutral conductors have increased capacity; An electrostatic shield is placed between the primary and the secondary windings; Effort is made to significantly reduce the harmonic voltage distortion between the primary input and the secondary output voltages. Totally enclosed, nonventilated, K-factor-rated transformers are available for dusty or dirty environments, such as automotive plants, pulp and paper mills, glass plants, and chemical plants. These units are larger, heavier, and more expensive than ventilated units but are ideal for use in difficult environments. Autotransformer In this type of transformer the primary and secondary windings are electrically connected so that part of the winding is common to both the primary and secondary. A simplified circuit of an autotransformer is shown in figure 10-1. In this figure, an input voltage V is applied across XZ , which has N turns. The exciting cur- 1 1 rent flows in the winding through XYZ, so the secondary voltage V , 2 , across YZ is with N2 " V1 N2 being the number of turns in YZ. N1 In an autotransformer, part of the power is transformed by conduction and the other part is by transformer action. This is the fundamental difference between a potential divider and an autotransformer. In a potential divider, almost the entire power flows by conduction, creating more losses than in the autotransformer. The input current in a potential divider must be higher than the output current, but in an autotransformer this is not the case.  Figure 10-1 Typical autotransformer In general, autotransformers are used when the transformation ratio is three or less and the electrical isolation of the two windings is not required. The application of autotransformers includes the following: Power distribution (lowering and raising voltage level)"buck-boost" operation Induction motor starters on a selected basis Small variable-voltage power supply units A characteristic use of autotransformers is illustrated by the following example. In the past, 600 V systems were common within certain industries. The conversion to 480 V could be accomplished by the use of a standard 480 to 120 V transformer. The 480 V winding was connected in series with the 120 V winding, thus obtaining 600 V. The neutral was common to both systems. After the source was converted to 480 V, the same buck-boost transformer could be turned around and used to convert 480 V to 600 V for the remaining equipment until it could be converted to the 480 V level. At the conclusion of the conversion, the standard 480 to 120 V transformer could be used for lighting use. Thus, the same transformer served three purposes. Their application is covered in Article 450 of the NEC [B15]. The advantages of autotransformers are as follows: a) For the same input and output; the weight of conductor, core material, and insulation of an autotransformer is less than that of a two-winding transformer: # # N weight of conductor # 2 = 1 " # in autotransformer # # N1 # # weight of conductor in " #two-winding transformer# Thus, if the transformation ratio is close to unity, the autotransformer is much less expensive than an equal-sized two-winding transformer. b) The efficiency of an autotransformer is higher than that of a two-winding transformer for the following reasons: Fewer windings result in lower losses. Since part of the energy transfer takes place by conduction, the exciting current is lower, creating lower reactance and losses. c) The reduction of ohmic resistance by reduction of conductor material, as well as the reduction of impedance by reduction of leakage flux and reactance due to presence of common winding, produce lower leakage impedance, thus creating a superior voltage regulation. The disadvantages of autotransformers are as follows: The electrical connection between primary and secondary winding can be hazardous in step-down operations when an open circuit occurs in the common winding (the low-voltage side will experience high voltage). The available fault current is higher than the comparable two-winding transformer because of the inherently lower impedance. The autotransformer provides less of a barrier to the transmission of electrical noise than does a comparable two-winding transformer. Specifications (Red 10.4) In specifying a transformer for a particular application, the following items comprising the rating structure should be included: Rating in kilovoltamperes or megavoltamperes Single-phase or three-phase Frequency Voltage ratings Voltage taps Winding connections, delta or wye Impedance (base rating) Basic impulse insulation level (BIL) Temperature rise The desired construction details to be specified should include the following: Insulation medium, dry or liquid type (see 10.4.7) Indoor or outdoor service Accessories Type and location of termination facilities Sound level limitations if the installation site requires this consideration Manual or automatic load tap changing Grounding requirements Provisions for future cooling of the specified type Radiator type and thickness Special painting requirements Category of enclosure (A, B, or C) for personnel protection per Table 3 in ANSI C57.12.13-1982 [B4], or Table 1 in ANSI C57.12.55-1987 [B14] Designation of enclosure type (103, 103R, 103S, or 104) for outdoor hazardous locations per Table 9 in ANSI C57.12.13-1982 [B4], or Table 7 in ANSI C57.12.55- 1987 [B14] Consideration should be given to energy conservation features in the transformer specification which may, in some instances, be mandated by law or by individual company policy. Where efficiency is of concern, several cost-analysis techniques are used to formalize procurement decisions with the goal of maximizing efficiency or minimizing overall life-cycle cost. In either case, the following information about the transformer should be supplied to the prospective vendors based on annualized operating projections: The cost in dollars/kW at which no-load losses are valued; The cost in dollars/kW at which load losses are valued; and The percentage of the transformer rating at which load losses will be evaluated during the bid-comparison process. Given this information, a prospective vendor can then establish the optimum proportion of conductor and core material to be used in the construction of the transformer. In this manner, the cost of inefficiency can be factored into the initial capital expenditure. This process is detailed in IEEE Std 739-1984 [B42]. Power and voltage ratings (Red 10.4) Ratings in kilovoltamperes or megavoltamperes will include the self-cooled rating at a specified temperature rise, as well as the forced-cooled rating if the transformer is to be so equipped. The standard self-cooled ratings, and self-cooled/forced-cooled relationships, are listed in tables 10-10 and 10-11. As a minimum, the self-cooled rating should be at least equal to the expected peak demand, with an allowance for projected load growth. Table 10-10Liquid-immersed and dry-type transformer standard base kVA ratings Single-phaseThree-phase1508338 333153003 75025 000*375125010 000*305005 00030 000*5100166712 500*457507 50037 500*10167250016 667*75100010 00050 000*15250333320 000*1121/2150012 00060 000*25333500025 000*150200015 00075 000*371/2500666733 000*225250020 000100 000* Source: Based on IEEE Std C57.12.00-1987 [B32] and IEEE Std C57.12.01-1989 [B33]. *Liquid-immersed transformer only. The standard average winding temperature rise (by resistance test) for the modern liquid- immersed transformer is 65 C, based on an average ambient of 30 C (40 C maximum) for any 24-hour period. Liquid-immersed transformers may be specified with a 55 C/65 C rise to permit 100% loading with a 55 C rise, and 112% loading at the 65 C rise. In addition, 115 C rise, high-fire-point, liquid-immersed transformers are available from some manufacturers. In NEMA TR 1-1980 [B47], IEEE Std C57.12.00-1987 [B32], and IEEE Std C57.12.01-1989 [B33], mention is made of three insulation classes, such as 150 C, 185 C, and 220 C. The modern 220 C insulation class dry-type transformer has an average winding temperature rise (by resistance) of 150 C, based on an average ambient temperature of 30 C, and a 24-hour period maximum ambient temperature of 40 C. The allowable hot-spot winding temperature rise is 30 C, resulting in a maximum hot spot temperature of 220 C. Low-loss, high-efficiency, dry-type transformers can be specified with 115 C or 80 C rise. These lower temperature rise units have longer life expectancies. For instance, a 115 C transformer has a life expectancy about ten times greater than that of a 150 C rise transformer. Dry-type transformers of 115 C and 80 C rise also have, respectively, an approximate emergency overload capability of 15% and 30%. However, most modern dry-type transformers 30 kVA and larger are designed with a UL-listed 220 C insulation system. Both liquid-immersed and dry-type transformers are available with lower core and coil watt loss designs at higher initial prices, but with significantly lower overall operating costs due to the higher energy efficiency. Table 10-11 Classes of transformer cooling systems ClassMethod of coolingOALiquid-immersed, self-cooledOA/FALiquid-immersed, self-cooled/forced-air-cooledOA/FA/FALiquid-immersed, self-cooled/forced-air-cooled/forced-air-cooledOA/FA/FOALiquid-immersed, self-cooled/forced-air-cooled/forced-liquid-cooledOA/FOA/FOALiquid-immersed, self-cooled/forced-air, forced-liquid-cooled/forced-air, forced-liquid-cooledFOALiquid-immersed, forced-liquid-cooled with forced-air-cooledFOWLiquid-immersed, forced-liquid-cooled with forced-water-cooledOWLiquid-immersed, water-cooledOW/ALiquid-immersed, water-cooled/self-cooledAADry-type,* ventilated self-cooledAFADry-type,* ventilated forced-air-cooledAA/FADry-type,* ventilated self-cooled/forced-air-cooledANVDry-type,* non-ventilated, self-cooledGADry-type,* sealed self-cooled Source: Based on IEEE Std C57.12.00-1987 [B32] and IEEE Std C57.12.01-1989 [B33] *Dry-type: Including those with solid cast and/or resin-encapsulated winding. Transformers have certain overload capabilities, varying with ambient temperature, preloading, and overload duration. These capabilities are defined in IEEE Std C57.92-1981 [B36] and IEEE Std C57.96-1989 [B37] for both the liquid-insulated and dry types. The substation transformer for industrial plant service is an integral three-phase unit, as compared to three single-phase units. The advantages of the three-phase unit, such as lower cost, higher efficiency, less space, and elimination of exposed interconnections, have contributed to its widespread acceptance. The transformer voltage ratings will include the primary and secondary continuous-duty levels at the specified frequency, as well as the BIL for each winding. The continuous rating specified for the primary winding will be the nominal line voltage of the system to which the transformer is to be applied, and preferably within 5% of the normally sustained voltage. The secondary or transformed voltage rating will be the value under no-load conditions. The change in secondary voltage experienced under load conditions is termed regulation, and is a function of the impedance of the system and the transformer and the power factor of the load. Table 10-12 illustrates the proper designation of voltage ratings. The BIT, for a transformer winding signifies the design and tested capability of its insulation to withstand transient overvoltages from lightning and other surges. Standard values of BIL established for each nominal voltage class are listed in tables 10-13 and 10-14. A description of test requirements for these values is given in IEEE Std C57.12.00-1987 [B32]. Transformer bushings may be specified with extra creepage distance and higher than standard BIL ratings, if required by local conditions or users' practices. Protecting the transformer windings from high-voltage surges with surge arresters will allow the use of a transformer with a lower BIL and still provide for better performance. For high voltage and high kVA-rated performance transformers, this will also result in lower transformer cost. Refer to Chapter 6 for a discussion on arrester application for the overvoltage protection of transformers. Voltage taps (Red 10.4) Voltage taps are usually necessary to compensate for small changes in the primary supply to the transformer, or to vary the secondary voltage level with changes in load requirements. The most commonly selected tap arrangement is the manually adjustable no-load type, con- 1 sisting of four 2 / 2 % steps or variations from the nominal primary voltage rating. These tap positions are usually numbered one through five, with the number one position providing the greatest number of effective turns. Based on a specific incoming voltage, selection of a higher voltage tap (lower tap number) will result in a lowering of the output voltage. The changing of tap positions is performed manually only with the transformer de-energized. In addition to the no-load taps, automatic tap-changing under load is available. This feature is considered desirable when load swings are larger and more frequent or voltage levels more critical. Automatic tap-changing under load can provide an additional automatic voltage adjustment, typically 10%, in incremental steps, with continuous monitoring of the secondary terminal voltage or of a voltage level remote from the transformer. Connections (Red 10.4) Connections for the standard two-winding power transformers are preferably delta-primary and wye-secondary. The wye-secondary, specified with external neutral bushing, provides a convenient neutral point for establishing a system ground, or can be run as a neutral conductor for phase-to-neutral load. The delta-connected primary isolates the two systems with respect to the flow of zero-sequence currents resulting from third-harmonic exciting current, secondary generated triplens due to non-linear loads, or a secondary ground fault, and may be used without regard to whether the system to which the primary is connected is three-wire or four-wire. Table 10-12(a)Designation of voltage ratings of single-phase windings (schematic representation) Identifi- cationNomen- clatureNameplate markingTypical winding diagramCondensed usage guide(1)(a)E2400E shall indicate a winding of E volts which is suitable for Aconnection on an E volt system.(1)(b)E/E 1 Y2400/4160YE/E1Y shall indicate a winding of E volts which is suitable for A connection on an E volt system or for Y connection on an E volt 1 system.(1)(c)E/E1GrdY2400/4160GrdYE/E1GrdY shall indicate a winding of E volts having reduced insulation which is suitable for A connection on an E volt system or Y connection on an E volt system, transformer 1 neutral effectively grounded.(1)(d)E 1 GrdY/E12 470GrdY/7200E1GrdY/E shall indicate a winding of E volts with reduced insulation at the neutral end. The neutral end may be connected directly to the tank for Y or for single-phase operation on an E volt system, provided the neutral 1 end of the winding is effectively grounded.(1)(e)E/2E120/240E/2E shall indicate a winding, the sections of which can be connected in parallel for operation at E volts, or which can be connected in series for operation at 2E volts, or connected in series with a center terminal for three wire operation at 2E volts between the extreme terminals and E volts between the center terminal and each of the extreme terminals.(1)(f)2E/E240/1202E/E shall indicate a winding for 2E volts, two-wire full kVA between extreme terminals, or 2E/E volts three-wire service with 1/2 kVA available only, from midpoint to each extreme terminal.(1)(g)V x V 1240 x 480 2400/4160Y x 4800/8320YV x V shall indicate a winding for 1 parallel or series operation only but not suitable for three-wire service. Source: Reprinted from IEEE Std C57.12.01-1989 [B33]. Key: E1= 3 E Table 10-12(b)Designation of voltage ratings of three-phase windings (schematic representation) Identifi- cationNomen- clatureNameplate markingTypical winding diagramCondensed usage guide(2)(a)E2400E shall indicate a winding of E volts which is suitable for connection on an E volt system.(2)(b)E 1 Y4160YE/E1Y shall indicate a winding of E volts which is suitable for connection on an E volt system or for Y connection on an E volt 1 system.(2)(c)E 1 Y/E4160Y/2400E1Y shall indicate a winding which is permanently Y connected with a fully insulated neutral brought out for operation on an E volt system, 1 with E volts available from line to neutral.(2)(d)E/E 1 Y2400/4160YE/E1Y shall indicate a winding which may be connected for operation on an E volt system, or may be Y connected without a neutral brought out (isolated) for operation on an E1 volt system.(2)(e)E/E 1 Y/E2400/4160Y/2400E/E1Y/E shall indicate a winding which may be connected for operation on an E volt system or may be Y connected with a fully insulated neutral brought out for operation on an E volt system with E volts 1 available from line to neutral.(2)(f)E GrdY/E 134 500GrdY/ 19 920E1GrdY/E shall indicate a winding with reduced insulation and permanently Y connected, with a neutral brought out and effectively grounded for operation on an E1 volt system with E volts available from line to neutral.(2)(g)E/E GrdY/E 17200/12 470GrdY/ 7200E/E1GrdY/E shall indicate a winding, having reduced insulation, which may be connected for operation on an E volt system or may be connected Y with a neutral brought out and effectively grounded for volt system with E volts available from line to neutral. Source: Reprinted from IEEE Std C57.12.01-1989 [B33]. Key: E = 3 E Table 10-12(b)Designation of voltage ratings of three-phase windings (schematic representation) (continued) Identifi- cationNomen- clatureNameplate markingTypical winding diagramCondensed usage guide(2)(h)V V 17200 14 400V V shall indicate a winding, the 1 sections of which may be connected in parallel to obtain one of the voltage ratings (as defined in a, b, c, d, e, f, and g) of V 1 , or may be connected in series to obtain one of the voltage ratings (as defined in a, b, c, d, e, f, and g) of V1. Windings are permanently or Y connected.4160Y/2400 12 470Y/7200 Source: Reprinted from IEEE Std C57.12.01-1989 [B33]. Key: E = 3 E 1 In some installations a grounded primary wye-wye transformer connection is used to minimize the problem of ferroresonance. However, this connection introduces the problem of having to cope with zero-sequence quantities during conditions of circuit unbalance. There are two methods for balancing zero-sequence ampere turns: Shell-form construction can be used to provide a low-reluctance return path for the single-phase zero-sequence flux. This construction would include the five- or four- legged core. The five-legged core is a three-phase core with five legs. Coils are mounted on three of the legs with the remaining two serving as a return path for magnetic flux. Thus, the five-legged core has a path for undesirable zero-sequence flux during unbalanced conditions. A delta-connected tertiary winding could circulate the required balancing ampere turns. A primary grounded transformer with a delta tertiary or equivalent delta tertiary winding will provide a source of ground fault current to system ground faults. However, a careful study must be made to determine the impact of such a ground source on the system ground fault protection and coordination. The maximum ground fault current provided by this transformer for external faults must not result in operation of primary fuses or overcurrent devices. Additionally, the transformer components must be designed to be thermally adequate to carry the maximum unbalance currents expected during both unbalanced steady state and ground fault conditions. It should also be noted that if one primary conductor opens upstream, the tertiary winding may attempt to feed power to other loads downstream of the failure and cause an overload and eventual failure of the tertiary winding. Impedance (Red 10.4) The impedance voltage of a transformer is the voltage required to circulate rated current through one of two specified windings of a transformer when the other winding is short- circuited, and with the windings connected as they would be for rated-voltage operation. Table 10-13Relationships of nominal system voltage to maximum system voltage and basic lightning impulse insulation levels (BIL) for systems 34.5 kV and below for liquid-immersed transformers ApplicationNominal system voltage (kV rms)Basic lightning impulse insulation levels (BIL) in common use (kV crest)Distribution1.2302.5455.0608.77595155.015012525.020015012534.5Power1.245302.560455.075608.795751109515.015025.020034.5 Source: Based on IEEE Std C57.12.00-1987 [B321. NOTES 1 BIL values in bold typeface are listed as standard in one or more of ANSI C57.12.10-1988 [B31, ANSI C57.12.20-1981 [B51, ANSI C57.12.21-1980 [B61, ANSI C57.12.22-1989 [B71, ANSI C57.12.23-1992 [B81, ANSI C57.12.24-1982 [B91, ANSI C57.12.25-1988 [B101, and ANSI C57.12.26-1992 [B11l. 2Single-phase distribution and power transformers and regulating transformers for voltage ratings between terminals of 8.7 kV and below are designed for both Y and connection and are insulated for the test voltages corresponding to the Y connection, so that a single line of transformers serves for the Y and applications. The test voltages for such transformers when operated connected are, therefore, higher than needed for their voltage rating. 3For series windings in transformers, such as regulating transformers, the test values to ground shall be determined by the BIL of the series windings rather than by the rated voltage between terminals. 4Values listed as nominal system voltage in some cases (particularly voltages 34.5 kV and below) are applicable to other lesser voltages of approximately the same value. For example, 15 kV encompasses nominal system voltages of 14 440 V, 13 800 V, 13 200 V, 13 090 V, 12 600 V, 12 470 V, 12 000 V, 11 950 V, etc. Impedance voltage is normally expressed as a percent value of the rated voltage of the winding in which the voltage is measured on the transformer self-cooled rating in kilovolt- amperes. The percent impedance voltage levels considered as standard for two-winding transformers are listed in tables 10-15 and 10-16, and a value specified above or below those listed may result in higher costs. The percent impedance voltage of a two-winding transformer shall have a tolerance of 7.5% of the specified value. For three-winding or auto- transformers, the manufacturing tolerance is 10%. The manufacturing tolerance is 10% from the specified impedance if the specified impedance is less than or equal to 2.5%, and Table 10-14Relationships of nominal system voltage and basic lightning impulse insulation levels (BILs) for systems 34.5 kV and below for dry-type transformers Nominal system voltage (kV)Basic lightning impulse insulation levels (BILs) in common use (kV crest)1020304560951101251502001.2S112.5S115.0S118.7S1115.0S1125.02S1134.52S1 Source: Reprinted from IEEE Std C57 .12.01-1989 [B33]. NOTES S = Standard values. 1 = Optional higher levels where exposure to overvoltage occurs and higher protective margins are required. 2 = Lower levels where surge arrester protective devices can be applied with lower spark-over levels. 7.5% if it is over 2.5%. When considering a low-impedance voltage level, as compared to figures shown in tables 10-15 and 10-16, it should be remembered that the standard transformer is designed with a limited ability to withstand the stresses imposed by external faults. Refer to IEEE Std C57.12.00-1987 [B32] for short-circuit requirements and IEEE Std C57.12.90-1987 [B34] for short-circuit test levels. A combined primary system and transformer impedance voltage permitting rms symmetrical fault magnitudes in excess of these standards should be avoided. With respect to impedance, transformers are generally considered suitable for parallel operation if their impedances match within 5%. The importance of minimizing the mismatch becomes greater as the total load approaches the combined capacity of the paralleled transformers, since load division is inversely proportional to the internal impedance. The impedance mismatch should be checked throughout the entire range of taps (both load and no-load). Insulation (Red 10.4) This classification includes three types: liquid, dry, and combination. The liquid-immersed type can be further defined by the types of liquid used: mineral oil, nonflammable, or low- Table 10-15BIL and percent impedance voltages at self-cooled (OA) rating for liquid-immersed transformers (833/958 kVA and abovesingle-phase 750/860 kVA and abovethree-phase) High-voltage BIL (kV)Without load tap changingWith load tap changingLow voltage 480VLow voltage 2400 V and aboveLow voltage 2400 V and above601105.75*5.5*1506.756.57.02007.257.07.5 Source: Based on Table 10 of ANSI C57.12.10-1988 [B31. NOTEThis table covers general percentage impedances values accepted industry-wide. Above- referenced values should be utilized, and manufacturers should be consulted for the transformers not included in the tables. *For transformers greater than 5000 kVA self-cooled, these values shall be the same as those shown for 150 kV high-voltage BIL. Table 10-16BILs and percent impedance voltage for dry-type transformers (501 kVA and above) High-voltage BIL (kV)Low voltage600 volts and below2400 volts and above60 and below5.755.75Above 60See noteSee note Source: Based on Table 4 of ANSI C57.12.51-1981 [B121 and on ANSI C57.12.55-1981 [B131. NOTEIn view of the relatively little experience industry has had in building and applying dry-type transformers above 15 kV high voltage, no consensus regarding standard values of impedance has yet been established. Such impedances should be determined by discussion between users and manufacturers until experience is available to determine consensus values. flammable liquids. The dry type includes the ventilated, cast coil, totally enclosed nonventilated, sealed gas-filled, and vacuum pressure impregnated (VPI) types. The third classification includes a combination liquid-, vapor-, and gas-filled unit. Dry-type transformers are being manufactured by several manufacturers with the same BIL as liquid-immersed transformers. A choice may be considered of specifying either the same BIL for dry-type as for liquid-immersed types since they both are subject to the same envi ronment as far as impulses and transients are concerned, or providing the power system with additional surge protection. Even though both dry and liquid-immersed transformers may be specified with the same BIL ratings, in severe environments having high levels of moisture or dirt, the sealed enclosure of the liquid-immersed (or the sealed or gas-filled dry) will maintain insulation levels better and with less maintenance. Insulation medium (Red 10.4) The selection of the insulation medium is dictated mainly by the installation site and cost. For outdoor installations, the mineral-oil-insulated transformer has widespread use due to its lowest cost and inherent weatherproof construction. When located close to combustible buildings, safeguards are required as specified by the NEC [B 15], Article 450-27. For indoor installations refer to the NEC, Article 450-26. Where mineral-oil-immersed transformers are installed, it may be necessary to provide means to prevent any escaped oil, including drips, from migrating into the environment. The discontinuance of the use of PCB (polychlorinated biphenyls) liquid-immersed transformers to meet regulatory requirements has promoted the use of high-fire-point liquids, such as polyalpha olefins, silicones, and high-molecular-weight hydrocarbons. They are being used in applications previously applied to PCB transformers with the tacit approval of insurance and safety authorities, as specified in the NEC [B 15], Article 450-23. In general, these high-fire-point liquids increase the cost of the transformer compared to mineral oil. These liquids should receive essentially the same care and maintenance that applies to conventional mineral-oil-immersed transformers. Per existing federal regulatory requirements, no new transformer installations may be made using PCB liquids. Due to environmental pollution impact, the users of existing PCB-immersed transformers should consult the manufacturer of the transformer or the manufacturer of the liquid for selection as well as proper safeguards in the disposal of used liquid (see IEEE Std C57.102- 1974 [B38]. All liquid-filled transformers must be properly labeled as to content, or if of unknown content, are assumed to be PCB-contaminated. The ventilated dry-type transformer has application in industrial plants for indoor installation where floor space, weight, and regard for liquid maintenance and safeguards would be important factors. Since the BILs listed as "standard values" for the ventilated dry-type and gas- filled transformer windings are usually less than that of the liquid-immersed surge arresters should be included for the primary winding in order to obtain additional protection, or the optional higher BILs listed in IEEE Std C57.12.01-1989 [B33] should be specified. The totally enclosed nonventilated dry-type transformer, the cast coil (where both the high- and low-voltage coils are cast), and the sealed or gas-filled dry-type transformer, although all more expensive than ventilated dry-type or mineral-oil-immersed units, are especially suitable for adverse environments. They require little maintenance, need no fire-proof vaults, and generally have lower losses than comparable ventilated or mineral-oil-immersed units. The same applies to the high-fire-point liquid-immersed transformers; however, when they are installed in combustible buildings or areas, automatic fire-extinguishing systems or vaults are required. Transformers over 35 000 V installed inside a building must be installed in vaults specified in B of Article 450 of the NEC [B 15]. Less flammable liquid-immersed transformers must meet Section 450-23 of the NEC and must meet the specific requirements of Underwriters Laboratories or the Factory Mutual Corporation for these types of liquids. On oil-immersed transformers, a sealed-tank construction and welded cover is standard practice with manufacturers. Optional oil-preservation systems may be specified as follows: A gas-oil seal that consists of an auxiliary tank mounted on the transformer. This seal provides for the safe expansion and contraction of the transformer gas and oil without exposing the transformer oil to the atmosphere. This option is now rarely used. An automatic gas seal that maintains a constant positive nitrogen pressure within the tank. A combination regulating valve and pressure relief operates with a cylinder of high-pressure nitrogen to control the proper functioning of this seal. Accessories (Red 10.4) Accessories furnished with the transformer include those identified as standard and optional in manufacturers' publications. The standard devices will vary with different types of transformers. Some of the optional devices that offer protective features include the following: Winding temperature equipment in addition to the standard top-oil temperature indicator. This device is calibrated for use with specific transformers and automatically takes into account the hottest spot temperature of the windings, ambient temperature, and load cycling. For this reason, it provides a more accurate, continuous, and automatic measure of the transformer loading and overloading capacity. It may have contacts that can be set to alarm and even subsequently trip a circuit breaker or fusible disconnect equipped with shunt trip capabilities. For all dry-type transformers, similar winding temperature protective devices employing detectors embedded in the windings are available. The pressure relay for sensitive high-speed indication of liquid-immersed transformer internal faults. Since the device is designed to operate on the rate of change of internal pressure, it is sensitive only to that resulting from internal faults and not to pressure changes due to temperature and loading. Alarm contacts such as temperature indicators, liquid-level and pressure vacuum gauges, and pressure-relief activator and alarm devices, can be included on the standard devices for more effective utilization. Surge arresters mounted directly on the transformer tank provide maximum surge protection for the transformer. The type of arrester specified and its voltage rating should be coordinated with the voltage parameters of the system on which it is applied and the BIL of the transformer. Refer to Chapter 6 for a detailed discussion of surge arrester application. Termination facilities (Red 10.4) Termination facilities are available to accommodate most types of installation. For the unit substation arrangement, indoors or outdoors, the incoming and outgoing bushings are usually side-wall-mounted and enclosed in a throat or transition section for connection to adjacent switchgear assemblies. Tank-wall-mounted enclosures, oil- or air-insulated, with or without potheads or cable clamps, are available for direct cable termination. The size and number of conductors should be specified, along with minimum space for stress cone termination, if required. For the station-type transformers in an outdoor installation, cover-mounted bushings provide the simplest facility for overhead lines. Sound levels (Red 10.4) The transformer sound level is of importance in certain installations. The maximum standard levels are listed in NEMA TR 1-1980 [B47]. These can be reduced to some extent by special design. The transformer manufacturer should be consulted regarding the possible reduction for a particular type and rating. Transformers Transformers in commercial installations are normally used to change a voltage level from a utility distribution voltage to a voltage that is usable within the building, and are also used to reduce building distribution voltage to a level that can be utilized by specific equipment. Applicable standards are the ANSI C57 Series and NEMA TR and ST Series. Transformers are constructed in several different types, which are discussed below. This section is generally applicable to transformers of the liquid filled, ventilated dry, or gas filled dry types. Liquid insulated and gas filled transformers have their windings brought out to bushings or to junction boxes on the ends or the top of the transformers. Ventilateddry-type transformers usually have their windings terminated within the enclosure of the transformer to either standoff insulators or bus bar terminals. Liquid Filled Transformers Are constructed with the windings encased in a liquid-tight tank filled with insulating liquid. Liquid filled transformers should be avoided inside commercial buildings unless nonflammable or less-flammable liquids are used or unless proper precautions are taken by building a transformer vault that meets the requirements of the NEC [9], and then only if all applicable jurisdictional and insurance carrier requirements have been met. The liquid provides insulation between the various sections of the windings and between the windings and the tank, and serves as a cooling medium, absorbing heat from the windings and transferring it to the outside of the tank. To increase the transfer of heat to the air, tanks are provided with cooling fins (to increase the area of the radiating surface) or with external cooling tubes or radiators. The hot liquid circulates through the radiators, transferring the heat picked up in the transformer windings to the radiator and then to the surrounding air. Fans are sometimes installed to force air over the radiators in order to increase the full load rating by approximately 15% on transformers rated 750-2000 kVA and 25% on transformers rated 2500-10 000 kVA. It is essential that the liquid in the transformer be maintained, clean, and free from moisture. Moisture can enter the transformer through leaks in the tank covers or when moisture-laden air is drawn into the transformer. Transformers can draw air into the tanks through breathing action that results from changes in the volume of liquid, and air in the tank that occurs with changes in temperature. Most modern transformers are tightly sealed and do not breathe if they are free from leaks. Insulating liquid, through the normal aging process, develops a small amount of acid that, if allowed to increase above well-established limits, can cause damage to insulation in the transformer. Yearly testing to determine the dielectric breakdown voltage of the liquid (a low dielectric test indicates the presence of water or other foreign material) and neutralization number (a high neutralization number indicates the presence of acid in the liquid) by a competent testing laboratory will greatly prolong the life of the transformer. Liquid samples should be withdrawn under carefully controlled conditions as directed by the group making the liquid test. In some areas, this service is available from the electric utility. The classification and handling of existing liquid filled transformers with regard to PCB contamination is subject to strict control by environmental agencies. Information on the handling and maintenance of liquid filled transformers can be obtained from the Federal Register, manufacturers, local EPA offices, and, usually, the local electric utility. It is important that any existing liquid filled transformers that have not been "evaluated" tagged, or otherwise classified be properly handled. Liquid filled transformers, which contain from 50500 parts per million (ppm) of PCB, have successfully been brought into the 050 ppm range, which is within the limits of non-PCB contamination. Ventilated-Dry-Type Transformers Are constructed in much the same manner as liquid filled transformers, except that the insulating liquid is replaced with air, and larger clearances and different insulating materials are used to compensate for the lower dielectric strength of air (see IEEE C57.12.01-1989, IEEE Standard General Requirements for Dry-Type Distribution and Power Transformers Including Those with Solid-Cast and/or Resin-Encapsulated Windings (ANSI) [24]). Both ventilated-dry-type and sealed-dry-type transformers use a UL component recognized insulation system that is suitable for operation at an ultimate temperature of 220 C. The normal temperature rise of the windings is 150 C by resistance. If transformers are purchased with a 220 C insulation system, but are rated for full load use at a lower temperature (115 C or 80 C rise), then an improvement in efficiency, overload capability, and life can be expected. Units rated over 600 V are listed under UL 15621990, Transformers, Distribution, Dry-Type Over 600 V [38].48 In addition, IEEE PC57.12.58, Guide for Conducting a Transient Voltage Analysis of a Dry-Type Transformer Coil [25] is a guide to making a transient analysis of the high-voltage winding to assure that the insulating system can withstand the repetitive transients prevalent in today's electric system due to vacuum switches and similar devices. IEEE PC57.12.58 [25] also indicates that a transient surge can be doubled upon entering the high-voltage winding. IEEE C57.12.01-1989 (ANSI) [24] also applies. Consideration should also be given to nonlinear harmonic loads, such as SCRs, UPS, rectifiers, and variable speed drive applications, since these higher harmonics can cause appreciably higher eddy and stray loss heating in the windings as well as very high currents in the neutrals of these transformers. Very often special designs for nonlinear load applications are preferable to just oversizing the unit because of the skin effect at the higher frequencies. The ventilated-dry-type transformer is provided with a sheet metal enclosure that surrounds the winding for mechanical protection of the windings and the safety of personnel. Ventilating 1ouvers are installed in the enclosure to permit thermal circulation of air directly over the winding for cooling. Fans are sometimes installed to force air directly over the windings in order to increase the full load rating by approximately 33%. These types of transformers are normally installed indoors and require the periodic cleaning of the complete core and coil assembly and an adequate supply of clean ventilating air. These transformers are gaining acceptance in the 15 kV and 34.5 kV class, and can be built to match the BIL of liquid immersed transformers and with special enclosures for use outdoors. Meggering before energizing is recommended after a lengthy shutdown or lengthy periods when the insulation has been subjected to moisture. Sealed-Dry-Type Transformers Sealed-dry-type transformers are constructed in essentially the same way as ventilated-dry-type transformers. The enclosing tank is sealed and operated under positive pressures. It may be filled with nitrogen or other dielectric gas. Heat is transferred from the winding to the gas within the transformer housing and from there to the tank and to the surrounding air. The sealed-dry-type (gas filled) transformer can be installed both outdoors and indoors and in areas where a corrosive or dirty atmosphere would make it impossible to use a ventilated-dry-type transformer. 48UL publications are available from Underwriters Laboratories, 333 Pfingsten Road, Northbrook, IL 60062. Cast-Coil, Dry-Type Transformers Are constructed with primary and secondary windings encapsulated (cast) in reinforced epoxy resin. Because of the cast-coil construction, they are ideal in applications where moisture or airborne contaminants, or both, are a major concern. This type of construction is available with primary voltage ratings through the 34.5 kV class and BIL ratings through 200 kV. These transformers are ideal alternatives for liquid or gas filled units in indoor or rooftop applications. They may be forced air cooled to increase their self-cooled ratings by 50%. Totally Enclosed, Nonventilated-Dry-Type Transformers Are constructed in essentially the same way as ventilated-dry-type transformers. The enclosure, while not sealed, contains air, so the units have the same BIL capabilities as ventilated-dry-type transformers. The totally enclosed, nonventilated-dry-type transformer can be installed both indoors and outdoors and in areas where a corrosive or dirty atmosphere would make it impossible to use a ventilated-dry-type transformer. These units are available with fan cooling for a minimum 25% increase in capacity. Winding Temperature Measurement and Controls Various temperature measurement equipment and controls are available for determining the winding temperature and for activating cooling, tripping, or alarm devices. To make sure the ultimate temperature of the insulating system is not exceeded, imbedded detectors should be wound in each low-voltage winding. Objectives in transformer protection Protection is achieved by the proper combination of system design, physical layout, and protective devices as required to Economically meet the requirements of the application, Protect the electrical system from the effects of transformer failure, Protect the transformer from disturbances occurring on the electrical system to which it is connected, Protect the transformer as much as possible from incipient malfunction within the transformer itself, and Protect the transformer from physical conditions in the environment that may affect reliable performance. Transformer primary protective device A fault on the electrical system at the point of connection to the transformer can arise from failure of the transformer (e.g., internal fault) or from an abnormal condition on the circuit connected to the transformer secondary, such as a short circuit (e.g., through fault). The predominant means of clearing such faults is a current-interrupting device on the primary side of the transformer, such as fuses, a circuit breaker, or a circuit switcher. Whatever the choice, the primary-side protective device should have an interrupting rating adequate for the maximum short-circuit current that can occur on the primary side of the transformer. If a circuit switcher is used, it should be relayed so that it is called upon only to clear lower current internal or secondary faults that are within its interrupting capability. Instantaneous relays used to protect transformer feeders and high-voltage windings are set greater than the maximum asymmetrical through-fault current on the transformer secondary. The operating current of the primary protective device should be less than the short-circuit current of the transformer as limited by the combination of system and transformer impedance. This recommendation is true for a fuse or a time-overcurrent relay. The point of operation should not be so low, however, to cause circuit interruption due to the inrush excitation current of the transformer or normal current transients in the secondary circuits. Of course, any devices operating to protect the transformer by detecting abnormal conditions within the transformer and removing it from the system also operate to protect the system; but these devices are subordinate to the primary protection of the transformer. Protecting the transformer from electrical disturbances (Buff 11.9) Transformer failures arising from abusive operating conditions are caused by Continuous overloading Short circuits Ground faults Transient overvoltages Overload protection (Buff 11.9) An overload causes a rise in the temperature of the various transformer components. If the final temperature is above the design temperature limit, deterioration of the insulation system occurs and causes a reduction in the useful life of the transformer. The insulation may be weakened so that a moderate overvoltage may cause insulation breakdown before expiration of expected service life. Transformers have certain overload capabilities that vary with ambient temperature, preloading, and overload duration. These capabilities are defined in ANSIC57.92-2000 and IEEE StdC57.96-1999. When the temperature rise of a winding is increased, the insulation deteriorates more rapidly, and the life expectancy of the transformer is shortened. Protection against overloads consists of both load limitation and overload detection. Loading on the transformers may be limited by designing a system where the transformer capacity is greater than the total connected load when a diversity in load usage is assumed. This method of providing overload protection is expensive because load growth and changes in operating procedures would quite often eliminate the extra capacity needed to achieve this protection. A good engineering practice is to size the transformer at about 125% of the present load to allow for system growth and change in the diversity of loads. The specification of a lower-than-ANSI temperature rise also permits an overload capability. Load limitation by disconnecting part of the load can be done automatically or manually. Automatic load shedding schemes, because of their cost, are restricted to larger units. However, manual operation is often preferred because it gives greater flexibility in selecting the expendable loads. In some instances, load growth can be accommodated by specifying cooling fans or providing for future fan cooling. The major method of load limitation that can be properly applied to a transformer is one that responds to transformer temperature. By monitoring the temperature of the transformer, overload conditions can be detected. A number of monitoring devices that mount on the transformer are available as standard or optional accessories. These devices are normally used for alarm or to initiate secondary protective device operation. They include the devices described in  REF RTF33303535383a2048342c312e \hOvercurrent relays and  REF RTF33333135383a2048342c312e \hFuses, circuit breakers, and fused switches. Overcurrent relays (Buff 11.9) Transformer overload protection may be provided by relays. Chapter 4 describes overcurrent relay construction characteristics and ranges. These relays are applied in conjunction with CTs and a circuit breaker or circuit switcher, sized for the maximum continuous and interrupting duty requirements of the application. A typical application is shown in Figure REF RTF32393936333a204669675469 \hError! Reference source not found.. Overcurrent relays are selected to provide a range of settings above the permitted overloads and instantaneous settings when possible within the transformer through-fault current withstand rating. The characteristics should be selected to coordinate with upstream and downstream protective devices. The settings of the overcurrent relays should meet the requirements of applicable standards and codes and meet the needs of the power system. The requirements in the National Electrical Code (NEC) (NFPA 70-1999) represent upper limits that should be met when selecting overcurrent devices. These requirements, however, are not guidelines for the design of a system providing maximum protection for transformers. For example, setting a transformer primary or secondary overcurrent protective device at 2.5 times rated current could allow that transformer to be damaged without the protective device operating. Fuses, circuit breakers, and fused switches (Buff 11.9) The best protection for the transformer is provided by circuit breakers or fuses on both the primary side and secondary side of the transformer when they are set or selected to operate at minimum values. Common practice is for the secondary-side circuit breaker or fuses to protect the transformer for loading in excess of 125% of maximum rating. Using a circuit breaker on the primary of each transformer is expensive, especially for small-capacity and less expensive transformers. An economical compromise is where one circuit breaker is installed to feed two to six relatively small transformers. Each transformer has its own secondary circuit breaker and, in most cases, a primary disconnect. Overcurrent protection should satisfy the requirements prescribed by the NEC. The major disadvantage of this system is that all of the transformers are de-energized by the opening of the primary circuit breaker. Moreover, the rating or setting of a primary circuit breaker selected to accommodate the total loading requirements of all of the transformers would typically be so large that only a small degree of secondary-fault protection, and almost no backup protection, would be provided for each individual transformer. By using fused switches on the primary of each transformer, short-circuit protection can be provided for the transformer and additional selectivity provided for the system. Using fused switches and time-delay dual-element fuses for the secondary of each transformer allows close sizing (typically 125% of secondary full-load current) and gives excellent overload and short-circuit protection for 600V or less applications. Short-circuit current protection (Buff 11.9) In addition to thermal damage from prolonged overloads, transformers are also adversely affected by internal or external short-circuit conditions, which can result in internal electromagnetic forces, temperature rise, and arc-energy release. Ground faults occurring in the substation transformer secondary or between the transformer secondary and main secondary protective device cannot be isolated by the main secondary protective device, which is located on the load side of the ground fault. These ground faults, when limited by a neutral grounding resistor, may not be seen by either the transformer primary fuses or transformer differential relays. They can be isolated only by a primary circuit breaker or other protective device tripped by either a ground relay in the grounding resistor circuit or a ground differential relay. A ground differential relay may consist of a simple overcurrent relay, connected to a neutral ground CT and the residual circuit of the transformer line CTs fed through a ratio matching auxiliary CT. Because this scheme is subject to error on through faults due to unequal CT saturation, a relay with phase restraint coils may be used instead of a simple overcurrent relay. Secondary-side short circuits can subject the transformer to short-circuit current magnitudes limited only by the sum of transformer and supply-system impedance. Hence, transformers with unusually low impedance may experience extremely high short-circuit currents and incur mechanical damage. Prolonged flow of a short-circuit current of lesser magnitude can also inflict thermal damage. Protection of the transformer for both internal and external faults should be as rapid as possible to keep damage to a minimum. This protection, however, may be reduced by selective-coordination system design and operating procedure limitations. Several sensing devices are available that provide varying degrees of short-circuit protection. These devices sense two different aspects of a short circuit. The first group of devices senses the formation of gases consequent to a fault and are used to detect internal faults. The second group senses the magnitude or the direction of the short-circuit current, or both, directly. The gas-sensing devices include pressure-relief devices, rapid pressure rise relays, gas-detector relays, and combustible-gas relays. The current-sensing devices include fuses, overcurrent relays, differential relays, and network protectors. Gas-sensing devices (Buff 11.9) Low-magnitude faults in the transformer cause gases to be formed by the decomposition of insulation exposed to high temperature at the fault. Detection of the presence of these gases can allow the transformer to be taken out of service before extensive damage occurs. In some cases, gas may be detected a long time before the unit fails. High-magnitude fault currents are usually first sensed by other detectors, but the gas-sensing device responds with modest time delay. These devices are described in detail in  REF RTF33393534313a2048322c312e \hError! Reference source not found.. Current-sensing devices (Buff 11.9) Fuses, overcurrent relays, and differential relays should be selected to provide the maximum degree of protection to the transformer. These protective devices should operate in response to a fault before the magnitude and duration of the overcurrent exceed the short-time loading limits recommended by the transformer manufacturer. In the absence of specific information applicable to an individual transformer, protective devices should be selected in accordance with applicable guidelines for the maximum permissible transformer short-time loading limits. Curves illustrating these limits for liquid-immersed transformers are discussed in  REF RTF31373737303a2048342c312e \hTransformer through-fault capability. In addition, ratings or settings of the protective devices should be selected in accordance with pertinent provisions of Chapter 4 of NEC Article 450. Transformer through-fault capability (Buff 11.9) The following discussion is excerpted and paraphrased from Appendix A of ANSI C37.91-2000. Similar information and through-fault protection curves can be found in IEEEStdC57.109-1993. The following discussion is based on these two standards. Overcurrent protective devices such as fuses and relays have well-defined operating characteristics that relate fault-current magnitude to operating time. The characteristic curves for these devices should be coordinated with comparable curves, applicable to transformers, which reflect their through-fault withstand capability. Such curves for CategoryI, CategoryII, CategoryIII, and CategoryIV liquid-immersed transformers (as described in IEEE StdC57.12.00-2000) are presented in this subclause as through-fault protection curves. The through-fault protection curve values are based on winding-current relationships for a three-phase secondary fault and may be used directly for delta-delta- and wye-wye-connected transformers. For delta-wye-connected transformers, the through-fault protection curve values should be reduced to 58% of the values shown to provide appropriate protection for a secondary-side single phase-to-neutral fault. Damage to transformers from through faults is the result of thermal and mechanical effects. The latter have gained increased recognition as a major cause of transformer failure. Although the temperature rise associated with high-magnitude through faults is typically acceptable, the mechanical effects are intolerable if such faults are permitted to occur with any regularity. This possibility results from the cumulative nature of some of the mechanical effects, particularly insulation compression, insulation wear, and friction-induced displacement. The damage that occurs as a result of these cumulative effects is, therefore, a function of not only the magnitude and duration of through faults, but also the total number of such faults. The through-fault protection curves presented in IEEE StdC57.12.00-2000 take into consideration the fact that transformer damage is cumulative, and the number of through faults to which a transformer can be exposed is inherently different for different applications. For example, transformers with secondary-side conductors enclosed in conduit or isolated in some other fashion, such as transformers typically found in industrial, commercial, and institutional power systems, experience an extremely low incidence of through faults. In contrast, transformers with overhead secondary-side lines, such as transformers found in utility distribution substations, have a relatively high incidence of through faults. Also, the use of reclosers or automatic reclosing circuit breakers may subject the transformer to repeated current surges from each fault. Thus, for a given transformer in these two different applications, a different through-fault protection curve should apply, depending on the type of application. For applications in which faults occur infrequently, the through-fault protection curve should reflect primarily thermal damage considerations because cumulative mechanical-damage effects of through faults would not be a problem. For applications in which faults occur frequently, the through-fault protection curve reflects the fact that the transformer is subjected to both thermal and cumulative-mechanical damage effects of through faults. In using the through-fault protection curves to select the time-current characteristics (TCCs) of protective devices, the protection engineer should take into account not only the inherent level of through-fault incidence, but also the location of each protective device and its role in providing transformer protection. For substation transformers with secondary-side overhead lines, the secondary-side feeder protective equipment is the first line of defense against through faults; therefore, its TCCs should be selected by reference to the frequent-fault-incidence protection curve. More specifically, the TCCs of feeder protective devices should be below and to the left of the appropriate frequent-fault-incidence protection curve. Secondary-side main protective devices (if applicable) and primary-side protective devices typically operate to protect against through faults in the rare event of a fault between the transformer and the feeder protective devices, or in the equally rare event that a feeder protective device fails to operate or operates too slowly due to an incorrect (i.e., higher) rating or setting. The TCCs of these devices, therefore, should be selected by reference to the infrequent-fault-incidence protection curve. In addition, these TCCs should be selected to achieve the desired coordination among the various protective devices. In contrast, transformers with protected secondary conductors (e.g., cable, bus duct, switchgear) experience an extremely low incidence of through faults. Hence the feeder protective devices may be selected by reference to the infrequent-fault-incidence protection curve. The secondary-side main protective device (if applicable) and the primary-side protective device should also be selected by reference to the infrequent-fault-incidence protection curve. Again, these TCCs should also be selected to achieve the desired coordination among the various protective devices. For CategoryI transformers (i.e., 5-500kVA single-phase, 15-500kVA three-phase), a single through-fault protection curve applies (see Figure REF RTF33363037383a204669675469 \hError! Reference source not found.). This curve may be used for selecting protective device TCCs for all applications, regardless of the anticipated level of fault incidence. For CategoryII transformers (i.e., 501-1667kVA single-phase, 501-5000kVA three-phase), and CategoryIII transformers (i.e., 1668-10000kVA single-phase, 500-30000kVA three-phase), two through-fault protection curves apply (see Figure REF RTF34323533353a204669675469 \hError! Reference source not found. and Figure REF RTF33323932333a204669675469 \hError! Reference source not found. , respectively). The left-hand curve in both figures reflects both thermal and mechanical damage considerations and may be used for selecting feeder protective device TCCs for frequent-fault-incidence applications. The right-hand curve in both figures reflects primarily thermal damage considerations and may be used for selecting feeder protective device TCCs for infrequent-fault-incidence applications. These curves may also be used for selecting secondary-side main protective device (if applicable) and primary-side protective device TCCs for all applications, regardless of the anticipated level of fault incidence. For CategoryIV transformers (i.e., above 10000kVA single-phase, above 30000kVA three-phase), a single through-fault protection curve applies (see Figure REF RTF31313130363a204669675469 \hError! Reference source not found.). This curve reflects both thermal and mechanical damage considerations and may be used for selecting protective device TCCs for all applications, regardless of the anticipated level of fault incidence. The aforementioned delineation of infrequent- versus frequent-fault-incidence applications for CategoryII and CategoryIII transformers can be related to the zone or location of the fault (see Figure REF RTF33303835393a204669675469 \hError! Reference source not found.). Because overload protection is a function of the secondary-side protective device or devices, the primary-side protective device characteristic curve may cross the through-fault protection curve at lower current levels. (Refer to appropriate transformer loading guides, IEEEStdC57.91-1995 and ANSIC57.92-2000.) Efforts should be made to have the primary-side protective device characteristic curve intersect the through-fault protection curve at as low a current as possible in order to maximize the degree of backup protection for the secondary-side devices. Fuses (Buff 11.9) Fuses utilized on the transformer primary are relatively simple and inexpensive one-time devices that provide short-circuit protection for the transformer. Fuses are normally applied in combination with interrupter switches capable of interrupting full-load current. By using fused switches on the primary where possible, short-circuit protection can be provided for the transformer, and a high degree of system selectivity can also be provided. Fuse selection considerations include having An interrupting capacity equal to or higher than the system fault capacity at the point of application A continuous-current capability above the maximum continuous load under various operating modes TCCs that pass, without fuse operation, the magnetizing and load-inrush currents that occur simultaneously following a momentary interruption, but interrupt before the transformer withstand point is reached Fuses so selected can provide protection for secondary faults between the transformer and the secondary-side overcurrent protective device and provide backup protection for the latter. The magnitude and duration of magnetizing inrush currents vary between different designs of transformers. Inrush currents of 8 or 12 times normal full-load current for 0.1 s are commonly used in coordination studies. Overload protection can be provided when fuses are used by utilizing a contact on the transformer temperature indicator to shed nonessential load or trip the transformer secondary-side overcurrent protective device. When the possibility of backfeed exists, the switch, the fuse access door, and the transformer secondary main overcurrent protective device should be interlocked to ensure the fuse is de-energized before being serviced. Relay-protected systems can provide low-level overcurrent protection. Relay protection systems and fused interrupter switches can provide protection against single-phase operation when an appropriate open-phase detector is used to initiate opening of a circuit breaker or interrupter switch if an open-phase condition should occur. Overcurrent relay protection (Buff 11.9) Overcurrent relays may be used to clear the transformer from the faulted bus or line before the transformer is damaged. On some small transformers, overcurrent relays may also protect for internal transformer faults. On larger transformers, overcurrent relays may be used to provide backup for differential or pressure relays. Time overcurrent relays (Buff 11.9) Overcurrent relays applied on the primary side of a transformer provide protection for transformer faults in the winding, and provide backup protection for the transformer for secondary-side faults. They provide limited protection for internal transformer faults because sensitive settings and fast operation are usually not possible. Insensitive settings result because the pickup value of phase-overcurrent relays must be high enough to take advantage of the overload capabilities of the transformer and be capable of withstanding energizing inrush currents. Fast operation is not possible because they must coordinate with loadside protection. Settings of phase-overcurrent relays on transformers involve a compromise between the requirements of operation and protection. These settings may result in extensive damage to the transformer from an internal fault. If only overcurrent protection is applied to the highvoltage delta side of a deltawye-grounded transformer, it can have a problem providing sensitive fault protection for the transformer. For low-voltage (wye-side) linetoground faults, the high-side line current is only 58% of the low-voltage per-unit fault current. When the wye is grounded through a resistor, the high-side fault current may be less than the maximum transformer load current. The time setting should coordinate with relays on downstream equipment. However, transformers are mechanically and thermally limited in their ability to withstand shortcircuit current for finite periods. For proper backup protection, the relays should operate before the transformer is damaged by an external fault. (Refer to the transformer through-fault current duration limits.) When overcurrent relays are also applied on the secondary side of the transformer, these relays are the principal protection for transformer secondary-side faults. However, overcurrent relays applied on the secondary side of the transformer do not provide protection for the transformer winding faults, unless the transformer is backfed. When setting transformer overcurrent relays, the short-time overload capability of the transformer in question should not be violated. (See IEEE StdC57.911995 and ANSIC57.922000 for allowable short-time durations, which may be different from the durations in the through-fault current duration curves.) The manufacturer should be consulted for the capability of a specific transformer. Instantaneous overcurrent relays (Buff 11.9) Phase instantaneous overcurrent relays provide short-circuit protection to the transformers in addition to overload protection. When used on the primary side, they usually coordinate with secondary protective devices. Fast clearing of severe internal faults can be obtained. The setting of an instantaneous relay is selected on its application with respect to secondary protective devices and circuit arrangements. Such relays are normally set to pick up at a value higher than the maximum asymmetrical throughfault current. This value is usually the fault current through the transformer for a low-side three-phase fault. The setting of instantaneous devices for short-circuit protection for three-circuit arrangements is described in Mathur  REF RTF32383935383a204269626c69 \hError! Reference source not found.. For instantaneous units subject to transient overreach, a pickup setting of 175% of the calculated maximum low-side threephase symmetrical fault current generally provides sufficient margin to avoid false tripping for a low-side bus fault, while still providing protection for severe internal faults. (Variations in pickup settings of 125% to 200% are common.) For instantaneous units with negligible transient overreach, a lesser margin can be used. The settings in either case shall also be above the transformer inrush current to prevent nuisance tripping. In some cases, instantaneous trip relays cannot be used because the necessary settings are greater than the available fault currents. In these cases, a harmonic restraint instantaneous relay may be considered to provide the desired protection. Tertiary winding overcurrent relays (Buff 11.9) The tertiary winding of an autotransformer, or threewinding transformer, is usually of much smaller kilovoltampere rating than the main windings. Therefore, fuses or overcurrent relays set to protect the main windings offer almost no protection to such tertiaries. During external system ground faults, these tertiary windings may carry very heavy currents. The method selected for protecting the tertiary generally depends on whether the tertiary is used to carry load. If the tertiary does not carry load, protection can be provided by a single overcurrent relay connected to a CT on the tertiary winding. This relay senses system grounds and also phase faults in the tertiary or in its leads. If the tertiary is used to carry load, partial protection can be provided by a single overcurrent relay supplied by three CTs, one in each winding of the tertiary and connected in parallel to the relay. This connection provides zero-sequence protection, but does not protect for positive- and negative-sequence overload current. The relay operates for system ground faults, but does not operate for phase faults in the tertiary or its leads. This relay needs to be set to coordinate with other system relays. Differential relays (Buff 11.9) Phase differential relays (Buff 11.9) Differential relaying compares the sum of currents entering the protected zone to the sum of currents leaving the protected zone; these sums should be equal. If more than a certain amount or percentage of current enters than leaves the protected zone, a fault is indicated in the protected zone; and the relay operates to isolate the faulted zone. Transformer differential relays operate on a percentage ratio of input current to through current; this percentage is called the slope of the relay. A relay with 25% slope operates when the difference between the incoming and outgoing currents is greater than 25% of the through current and higher than the relay minimum pickup. The fault-detection sensitivity of differential relays is determined by a combination of relay setting and circuit parameters. For most high-speed transformer differential relays, the relay pickup is about 30% of the tap setting. Depending on the setting, sensitivity is about 25% to 50% of full-load current. For delta-wye-connected transformers that supply low-resistance-grounded systems, phase differential relays should be supplemented with secondary ground differential relays (Device87TG), as shown in Figure REF RTF33393336373a204669675469 \hError! Reference source not found., to provide additional sensitivity to secondary ground faults. For more details on application of Device87TG, refer to Chapter8 on ground-fault protection. The protection for a single-phase transformer is shown in Figure REF RTF33333637373a204669675469 \hError! Reference source not found., although most transformer differential relay applications would apply to three-phase transformers of 5MVA and larger. In Figure REF RTF33333637373a204669675469 \hError! Reference source not found. , two restraining windings and one operating coil are shown. The CT ratios are selected to produce essentially equal secondary currents so that, under a no-fault condition, the CT secondary current entering one restraining circuit continues through the other restraining circuit, with no differential current to pass through the operating circuit. Because of ratio mismatches in CTs and relay tap settings, some current may always exist in the operating circuit under a no-fault condition. When a fault is internal to the differential relay zone, definite quantities of current flow into the operating circuit. The relay then responds to this differential current based on the ratio of the operating current to the restraining currents. The relay operates to trip when this ratio exceeds the slope setting and is above the relay minimum sensitivity. (Ratio settings of 15%, 25%, 30%, or 40% are usually available.) The three-phase connection shown in Figure REF RTF31333439373a204669675469 \hError! Reference source not found. illustrates a typical application for protection of a three-phase transformer. The transformer is connected wye-delta: this configuration is selected generally to provide an ungrounded secondary connection while permitting the primary wye neutral to be grounded solidly. Other configurations would be reversed, and the grounded wye would be the secondary connection. The basic delta-wye or wye-delta connection produces a phase shift between current entering the primary and current leaving the secondary. For this reason, the CTs on the wye side have their secondaries connected in delta, and the CTs on the delta side have their secondaries connected in wye. Several considerations are involved in the application of differential relays: The system should be designed so that the relays can operate a transformer primary circuit breaker. If a remote circuit breaker is to be operated, a remote trip system should be used (e.g., a pilot wire, a high-speed grounding switch). Often the utility controls the remote circuit breaker and may not allow it to be tripped. Operation of a user-owned local primary circuit breaker presents no problem. CTs associated with each winding typically have different ratios, ratings, and excitation characteristics when subjected to heavy loads and short circuits. Multiratio CTs and relay taps may be selected to compensate for ratio differences. A less preferable but acceptable method is to use auxiliary transformers. Transformer taps can be operated changing the effective turns ratio. By selecting the ratio and taps for midrange, the maximum unbalance will be equivalent to half the transformer tap range. CTs of the same make and type are recommended to minimize error current due to the CTs different characteristics. Magnetizing inrush current appears as an internal fault to the differential relays. The relays should be desensitized to the inrush current, but they should be sensitive to short circuits within the protection zone during the same period. This goal can be accomplished using relays with harmonic restraint. The magnetizing current inrush has a large harmonic component, which is not present in short-circuit currents. This feature permits harmonic-restraint relays to distinguish between faults and inrush. Transformer connections often introduce a phase shift between high- and low-voltage currents. Proper CT connections compensate for this shift. For a delta-primary, wye-secondary transformer, CTs are normally wye connected in the primary and delta connected in the secondary. Heavy currents for faults outside the zone of protection can cause an unbalance between the CTs. Percentage differential relays shown in Figure REF RTF33333637373a204669675469 \hError! Reference source not found., which operate when the difference is greater than a definite percentage of the phase current, are designed to overcome this problem. Percentage differential relays also help in solving the tap-changing problem and the CT ratio balance problem. Percentage slopes vary by manufacturer, but are generally available from 15% to 60%. A slope of 15% is normally used for standard transformers, 25% for load tap-changing transformers, and 40% to 60% for special applications. Guidelines are provided in 4.4.15.3 on selecting the slope. Harmonic-restraint percentage differential relays are recommended for transformers rated 5000kVA and above. Unlike the differential relays applied to protect high-voltage buses or large motors, the transformer differential relay application has both harmonics and phase shift to consider. Although all transformer differential relays do not include harmonic filters, the use of harmonic filters has been beneficial and faster acting, and they permit more sensitive pickups. A delta-wye, or wye-delta, transformer with the neutral grounded is a source (i.e., generator) of zero-sequence (or ground) fault current. A ground fault on the wye side of the transformer, external to the differential protective zone, causes zero-sequence currents to flow in the CTs on the wye side of the transformer without corresponding current flow in the line CTs on the delta side of the transformer. If these zero-sequence currents are allowed to flow through the differential relays, they cause immediate undesired tripping. To prevent such undesired tripping, the CT connections should cause the zero-sequence currents to flow in a closed-delta CT secondary connection of low impedance instead of in the differential relay operating coil. This goal is readily accomplished by connecting the CT secondary in delta on the wye side of the transformer. In addition to the phase shift, which is easily corrected, the magnitudes of the secondary currents rarely match each other when standard CT ratios are employed. To compensate for this tendency, most percentage differential relays have selectable auto transformer taps at the input of each restraining winding. By following the relay instructions, the best match can be made so that the current in the no-fault operating coil is minimized. In some cases where high-voltage switchyards are involved, the available relay adjustments on electromechanical relays are inadequate, due to the limited tap range available. Therefore, auxiliary CTs or autotransformers are needed. This configuration should be attempted only after a thorough examination of the effects of through faults and secondary burdens upon the primary CTs. Solid-state relays typically have a wide tap range with incremental selectivity that allows reduced mismatch to below 2%. This setup eliminates the need for auxiliary or autotransformers. Assuming that CT ratio and phase shift problems can be resolved, a transformer secondary may often be connected to more than one bus. In that event, a separate restraining winding is required for each such bus. Paralleling CT secondaries in place of multiple restraining windings can lead to misoperation on through faults if the secondary buses are strong fault-current sources. If they are only weak sources, then paralleled CT secondaries are acceptable. Harmonics in the primary circuit can develop during transformer energization, during overvoltage periods, and during through faults. The harmonics could cause differential relay misoperation if not recognized. For the most part, zero-sequence harmonics (e.g., third, ninth) are excluded from the relays by the CT secondary connection. The second harmonic and some relays with higher harmonics (e.g., fifth, seventh, eleventh, thirteenth) are filtered to restrain them. The filtered harmonics are applied to the restraining winding when the magnitude of the second harmonic exceeds 7.5% to 20% of the fundamental current. The lower percentage is beneficial during normal no-fault conditions because it provides larger restraining action, but the lower percentage setting makes the relay less sensitive on an internal fault. Ground differential relays (Buff 11.9) Protection of the transformer by percentage differential relays improves the overall effectiveness in detecting phase-to-phase internal faults. However, line-to-ground faults in a wye winding may not be detected if the transformer is low-resistance-grounded where ground-fault current is limited to a low value below the differential relay pickup level. Such ground faults may evolve into to a destructive phase-to-phase fault. A protection scheme for low-resistance-grounded system is shown in Figure REF RTF33393336373a204669675469 \hError! Reference source not found.. Where the transformer is solidly grounded, the transformer differential relay operates for ground faults within the differential protective zone. Two methods can be easily adapted for protecting the wye winding more effectively. Figure REF RTF34303930343a204669675469 \hError! Reference source not found. illustrates one approach that employs an overcurrent relay in a differential connection. The zero-sequence currents are shown for an external fault. Properly connected, the secondary current circulates for this external fault, but would be additive for an internal fault and cause Device51G to operate. The method shown in Figure REF RTF34303930343a204669675469 \hError! Reference source not found. is susceptible to through faults that may saturate the phase CTs and cause Device51G to operate. For this reason CT selections are more demanding and Device51G settings are less sensitive than would originally appear. Utilizing a directional relay shown in Figure REF RTF34303736353a204669675469 \hError! Reference source not found. can overcome problems associated with CT saturation on through faults. The currents shown are for an external fault, and the secondary currents circulate as shown. However, upon an internal fault, the secondary currents are additive in the operating coil as shown in Figure REF RTF31323837323a204669675469 \hError! Reference source not found.. This directional relay has the additional element that prevents misoperation and, in fact, permits a faster acting relay: a product relay that can operate in less than a cycle. Comparing this operating time to the seconds taken by a Device51G relay makes the choice more definitive. In any ground-fault differential relay application, selection of CT ratios is important. The neutral CT ratio is generally smaller than the phase CT. In such cases, the auxiliary CT in the residual secondary can correct this mismatch. Some users select the auxiliary CT ratio so that slightly more restraining current flows during an external fault, as shown in Figure REF RTF31333638373a204669675469 \hError! Reference source not found.. In effect, this excess secondary current flows in the opposite direction in the operating winding and precludes false operation. Network protectors (Buff 11.9) The network protector is normally flange mounted directly on the network transformer low-voltage terminals. The network protector contains the following components: low-voltage air circuit breaker, controls for the air circuit breaker, and network relays. Network protectors trip for faults occurring on the primary side of the network transformer and/or when a power reversal occurs with power flowing from the secondary side of the network transformer to the primary side. The wattvar network master relay has superior operating characteristics over the standard watt network master relay. If a primary-side linetoground fault occurs and a single primary fuse operates without tripping the feeder breaker, the unfaulted phases may still supply power to the network. Under these conditions, the net threephase power flow in the network protector is not in the reverse direction, and the standard watt master relay does not operate. The reactive flow (vars) in the network protector is in the reverse direction. The wattvar master relay properly connected to see this reverse reactive flow operates for this condition. Protection against overvoltages (Buff 11.9) Transient overvoltages produced by lightning, switching surges, switching of power factor correction capacitors, and other system disturbances can cause transformer failures. High-voltage disturbances can be generated by certain types of loads and from the incoming line. A common misconception is that underground services are isolated from these disturbances. System insulation coordination in the use and location of primary and secondary surge arresters is important. Normally, liquid-insulated transformers have higher basic impulse insulation level (BIL) ratings than standard ventilated dry and sealed dry transformers. Solid dielectric cast coil transformers have BILs equal to liquid-insulated transformers. Ventilated dry transformers and sealed dry transformers can be specified to have BILs equal to the BILs of liquid transformers. Surge arresters (Buff 11.9) Ordinarily, if the liquid-insulated transformer is supplied by enclosed conductors from the secondaries of transformers with adequate primary surge protection, additional protection may not be required, depending on the system design. However, if the transformer primary or secondary is connected to conductors that are exposed to lightning, the installation of surge arresters is necessary. For best protection, the surge arrester should be mounted as close as possible to the transformer terminals, preferably within 1 m and on the load side of the incoming switch. This location ensures that the lead inductance does not affect the impedance adversely and, therefore, affect the performance of the surge arrester and surge capacitor. If the surge arrester is built into the transformer, further engineering is required to determine whether additional surge protection is required on the secondary. The degree of surge protection obtained is determined by the amount of exposure, the size and importance of the transformer to the system, and the type and cost of the arresters. In descending order of cost and degree of protection, the types of arresters are station, intermediate, and distribution. Ventilated dry and sealed dry transformers are normally used indoors, and surge protection is still necessary. Because all systems have the potential for transmitting and reflecting primary and secondary surges caused by lightning and system disturbances, special low-sparkover distribution arresters and low-voltage arresters have been developed for the protection of dry transformers and rotating machinery. The surge arrester selection (i.e., kV class) should be based on the system voltage and system conditions (i.e., grounded or ungrounded). The arrester kV class is not determined by the kV class of the primary winding of the transformer. Surge capacitors (Buff 11.9) Additional protection in the form of surge capacitors located as closely as possible to the transformer terminals may also be appropriate for all types of transformers. The installation should be examined for excess capacitance already existing in the shielded conductors. Transformer windings can experience a nonuniform distribution of a fast-front surge in the winding, and this surge can overstress the turn insulation locally in parts of the windings. Surge capacitors serve a dual function of sloping off fast-rising transients that might impinge on the transformer winding and of reducing the effective surge impedance presented by the transformer to an incoming surge. This type of additional protection is appropriate against voltage transients generated within the system due to circuit conditions such as prestriking, restriking, high-frequency current interruption, multiple reignitions, voltage escalation, and current suppression (or chopping) as the result of switching, current-limiting fuse operation, thyristor-switching, or ferroresonance conditions. Ferroresonance (Buff 11.9) Ferroresonance is a phenomenon resulting in the development of a higher than normal voltage in the windings of a transformer. These overvoltages may result in surge arrester operation, damage to the transformer, and electrical shock hazard. The following conditions combine to produce ferroresonance: No load on the transformer An open circuit on one of the primary terminals of the transformer and, at the same time, an energized terminal. In the case of three-phase transformers, either one or two of the three primary terminals may be disconnected. The location of the point of disconnection if it is not close to the transformer A voltage potential between the disconnected terminal conductor and ground The resonant circuit may be traced from the energized terminal through the transformer primary to one of the disconnected terminals, then through the capacitance of the isolated terminal conductor insulation to ground, and then back through the supply system to the energized terminal (see Figure REF RTF32333334333a204669675469 \hError! Reference source not found.). Although more common with underground distribution systems, ferroresonance can occur with overhead lines when the single-phase open point is far enough from the transformer. The typical scenarios for ferroresonance involve single-phase remote switching of an unloaded transformer, remote primary fuse operation on one phase, or failure of all three poles of a three-pole device to properly open accompanied by disconnection of the secondary load. Ferroresonance may be minimized or eliminated by having load connected to the secondary when single-phase switching on the primary; by using gang-operated switches, circuit breakers, or circuit switchers on the primary; or by providing that current-interrupting devices are located next to or on the transformer. The subject of ferroresonance is complicated, and the literature on this subject should be reviewed by concerned persons to avoid ferroresonance in transformer operation or system design. Fundemental Properties Theory vs Reality Transformer types Dry-Type Transformers Liquid Filled Transformers Conductors, Raceways and Cable Trays Conductors 12.1 Introduction The primary function of cable is to carry energy reliably between source and utilization equipment. In carrying this energy, there are heat losses generated in the cable that must be dissipated. The ability to dissipate these losses depends on how the cables are installed, and this affects their ratings. Cables may be installed in raceway, in cable trays, underground in duct or direct buried, in cable bus, as open runs of cable, or may be messenger supported. The selection of conductor size requires consideration of the load current to be carried and the loading cycle, emergency overloading requirements and duration, fault clearing time and interrupting capacity of the cable overcurrent protection or source capacity, voltage drop, and ambient temperatures for the particular installation conditions. Caution must be exercised when locating conductors in high ambient heat areas so that the operating temperature will not exceed that designated for the type of insulated conductor involved. Insulations can be classified in broad categories as solid insulations, taped insulations, and special purpose insulations. Cables incorporating these insulations cover a range of maximum and normal operating temperatures and exhibit varying degrees of flexibility, fire resistance, and mechanical and environmental protection. The installation of cables requires care in order to avoid excessive pulling tensions that could stretch the conductor or insulation shield, or rupture the cable jacket when pulled around bends. The minimum bending radius of the cable or conductors should not be exceeded during pulling around bends, at splices, and particularly at terminations to avoid damage to the conductors. The engineer should also check each run to ensure that the conductor jamming ratio is correct and the maximum allowable sidewall pressure is not exceeded. Provisions should be made for the proper terminating, splicing, and grounding of cables. Minimum clearances must be maintained between phases and between phase and ground for the various voltage levels. The terminating compartments should be designed and constructed to prevent condensation from forming. Condensation or contamination on medium voltage terminations could result in tracking over the terminal surface with possible flashover. Many users test cables after installation and periodically test important circuits. Test voltages are usually dc of a level recommended by the cable manufacturer for the specific cable. Usually this test level is well below the dc strength of the cable, but it is possible for accidental flashovers to weaken or rupture the cable insulation due to the higher transient overvoltages that can occur from reflections of the voltage wave. IEEE Std 400-19871 provides a detailed discussion on cable testing. The application and sizing of all cables rated up to 35 kV is governed by the National Electrical Code (NEC) (ANSIINFPA 70-1993). Cable use may also be covered under state and local regulations recognized by the local electrical inspection authority having jurisdiction in a particular area. The various tables in this chapter are intended to assist the electrical engineer in laying out and understanding, in general terms, requirements for the cable system under consideration. 12.2 Cable construction 12.2.1 Conductors The two conductor materials in common use are copper and aluminum. Copper has historically been used for conductors of insulated cables due primarily to its desirable electrical and mechanical properties. The use of aluminum is based mainly on its favorable conductivity to weight ratio (the highest of the electrical conductor materials), its ready availability, and the lower cost of the primary metal. The need for mechanical flexibility usually determines whether a solid or a stranded conductor is used, and the degree of flexibility is a function of the total number of strands. The NEC requires conductors of No. 8 AWG and larger to be stranded. A single insulated or bare conductor is defined as a conductor, whereas an assembly of two or more insulated conductors, with or without an overall covering, is defined as a cable. Stranded conductors are available in various configurations, such as stranded concentric, compressed, compact, rope, and bunched, with the latter two generally specified for flexing service. Bunched stranded conductors consist of a number of individual strand members of the same size that are twisted together to make the required area in circular mils for the intended service. Unlike the individual strands in a concentric stranded conductor, illustrated in figure 12-1, the strands in a bunch stranded conductor are not controlled with respect to one another. This type of conductor is usually found in portable cords. 12.2.2 Comparison between copper and aluminum Aluminum requires larger conductor sizes to carry the same current as copper. For equivalent ampacity, aluminum cable is lighter in weight and larger in diameter than copper cable. The properties of these metals are given in table 12-1. The 36% difference in thermal coefficients of expansion and the different electrical nature of their oxide films require consideration in connector designs. An aluminum oxide film forms immediately on exposure of fresh aluminum surface to air. Under normal conditions it slowly builds up to a thickness of 36 nanometers (nm) and stabilizes at this thickness. The oxide film is essentially an insulating film or dielectric material and provides aluminum with its corrosion resistance. Copper produces its oxide rather slowly under normal conditions, and the film is relatively conducting, presenting no real problem at connections.  Figure 12-1 Conductor stranding Approved connector designs for aluminum conductors essentially provide increased contact areas and lower unit stresses than are used for copper cable connectors. These terminals possess adequate strength to ensure that the compression of the aluminum strands exceeds their yield strength and that a brushing action takes place that destroys the oxide film to form an intimate aluminum contact area yielding a low-resistance connection. Recently developed aluminum alloys provide improved terminating and handling as compared to electrical conductor (EC) grades. Water should be kept from entering the strand space in aluminum conductors at all times. Any moisture within a conductor, either copper or aluminum, is likely to cause corrosion of the conductor metal or impair insulation effectiveness. 12.2.3 Insulation Basic insulating materials are classified as either organic or inorganic. A wide variety of insulations fall into the organic classification. Mineral-insulated cable employs the one inorganic insulation, magnesium oxide (MgO), that is generally available. Table 12-1 Properties of copper and aluminum PropertyCopper electrolyticAluminum ECConductivity, % IACS* at 20 C100.061.0Resistivity, cmil/ft at 20 C10.37117.002Specific gravity at 20 C8.892.703Melting point, C1083660Thermal conductivity at 20 C, (cal cm)/(cm2 C s)t0.9410.58Specific heat, cal/(g C)t for equal weights for equal direct-current resistance0.0920.230.1840.23Thermal expansion, in; equal to constant 106 length in inches F steel = 6.19.412.818-8 stainless = 10.2 brass = 10.5 bronze = 15Relative weight for equal direct-current resistance and length1.00.506 Modulus of elasticity, (lb/in 2 ) 101610 *International annealed copper standard. tIn this table, cal denotes the gram calorie. Insulations in common use are the following: Thermosetting compounds, solid dielectric Thermoplastic compounds, solid dielectric Paper laminated tapes Varnished cloth, laminated tapes Mineral insulation, solid dielectric granular Most of the basic materials listed in table 12-2 must be modified by compounding or mixing with other materials to produce desirable and necessary properties for manufacturing, handling, and end use. The thermosetting or rubberlike materials are mixed with curing agents, accelerators, fillers, and antioxidants in varying proportions. Cross-linked polyethylene (XLPE) is included in this class. Generally, smaller amounts of materials are added to the thermoplastics in the form of fillers, antioxidants, stabilizers, plasticizers, and pigments. Table 12-2Commonly used insulating materials Common nameChemical compositionProperties of insulationElectricalPhysicalThermosettingCross-linked polyethylenePolyethyleneExcellentExcellentEPREthylene propylene rubberExcellentExcellent(copolymer and terpolymer)ButylIsobutylene isopreneExcellentGoodSBRStyrene butadiene rubberExcellentGoodOil baseComplex rubber-like compoundExcellentGoodSiliconeMethyl chlorosilaneGoodGoodTFE*TetrafluoroethyleneExcellentGoodETFEtEthylene tetrafluoroethyleneExcellentExcellentNeopreneChloropreneFairGoodClass CP rubberlChlorosulfonated polyethyleneGoodGoodThermoplasticPolyethylenePolyethyleneExcellentGoodPolyvinyl chloridePolyvinyl chlorideGoodGoodNylonPolyamideFairExcellent *For example, Teflon or Halon. tFor example, Tefzel. lFor example, Hypalon. Insulation comparison. The aging factors of heat, moisture, and ozone are among the most destructive to organic insulations, so the following comparisons are a gauge of the resistance and classifications of these insulations. Relative heat resistance. The comparison in figure 12-2 illustrates the effect of a relatively short period of exposure at various temperatures on the hardness characteristic of the material at that temperature. The basic differences between thermoplastic and thermosetting insulation, excluding aging effect, are evident.  Figure 12-2Typical values for hardness versus temperature Heat aging. The effect on elongation of an insulation (or jacket) when subjected to aging in a circulating air oven is an acceptable measure of heat resistance. The air oven test at 121 C, which is contained in some specifications, is severe, but provides a relatively quick method of grading materials for possible use at elevated conductor temperatures or in hot spot areas. The 150 C oven aging is many times more severe and is used to compare materials with superior heat resistance. The temperature ratings of insulations in general use are shown in table 12-3. Depending upon the operating conditions, the maximum shield temperature must also be considered (see ICEA P-45-482-1979). Ozone and corona resistance. Exposure to accelerated conditions, such as higher concentrations of ozone (as standardized by NEMA WC 5-1973) for butyl, 0.03% ozone for 3 h at room temperature, or air oven tests followed by exposure to ozone, or exposure to ozone at elevated temperatures, aids in measuring the ultimate ozone resistance of the material. Insulations exhibiting superior ozone resistance under accelerated conditions are silicone, rubber, polyethylene, cross-linked polyethylene (XLPE), ethylene propylene rubber (EPR), and polyvinyl chloride (PVC). In fact, these materials are, for all practical purposes, inert in the presence of ozone. However, this is not the case with corona discharge. The phenomenon of corona discharge produces concentrated and destructive thermal effects along with formation of ozone and other ionized gases. Although corona resistance is a property associated with cables over 600 V, in a properly designed and manufactured cable, damaging corona is not expected to be present at operating voltage. Materials exhibiting less susceptibility than polyethylene and XLPE to such discharge activity are the EPRs. Moisture resistance. Insulations such as XLPE, polyethylene, and EPR exhibit excellent resistance to moisture as measured by standard industry tests, such as the ICEA Accelerated Water Absorption TestElectrical Method (EM-60) (see NEMA WC 3-1980, NEMA WC 5-1973, NEMA WC 7-1988, and NEMA WC 8-1988). The electrical stability of these insulations in water as measured by capacitance and power factor is impressive. A degradation phenomenon called "treeing" has been found to be aggravated by the presence of water. This phenomenon appears to occur in solid dielectric insulations and is more prevalent in polyethylene and XLPE than in EPR. The capacitance and power factor of natural polyethylene and some cross-linked polyethylenes are lower than those of EPR or other elastomeric power cable insulations. Insulations in general use. Insulations in general use for 2 kV and above are shown in table 12-3. Solid dielectrics, both thermoplastic and thermosetting, are used most frequently, while laminated constructions, such as paper and lead cables, are being used only on critical circuits in industrial facilities. Table 12-3Rated conductor temperatures Insulation typeMaximum voltage class (kV)Maximum operating temperature (C)Maximum overload* temperature (C)Maximum short-circuit temperature (C)Paper (solid-type) multi-995115200conductor and single2990110200conductor, shielded4980100200696580200Varnished cambric585100200157785200287072200Polyethylene (natural)t57595150357590150SBR rubber27595200Butyl rubber5901052003585100200Oil-base rubber357085200Polyethylene (cross-linked)t3590130250EPR rubbert3590130250Chlorosulfonated polyethylenet290130250Polyvinyl chloride2608515027595150290105150Silicone rubber5125150250Ethylene tetrafluoroethylenel2150200250 *Operation at these overload temperatures shall not exceed 100 h/yr. Such 100 h overload periods shall not exceed five. tCables are available in 69 kV and higher ratings. lFor example, Tefzel. The generic names given for these insulations cover a broad spectrum of actual materials, and the history of performance on any one type may not properly be related to another in the same generic family. 12.2.4 Cable design The selection of power cable for particular circuits or feeders should be based on the following considerations: Electrical. Dictates conductor size, type and thickness of insulation, correct materials for low- and medium-voltage designs, consideration of dielectric strength, insulation resistance, specific inductive capacitance (dielectric constant), and power factor. Thermal. Compatible with ambient and overload conditions, expansion, and thermal resistance. Mechanical. Involves toughness and flexibility, consideration of jacketing or armoring, and resistance to impact, crushing, abrasion, and moisture. Chemical. Stability of materials on exposure to oils, flame, ozone, sunlight, acids, and alkalies. Flame resistance. Cables installed in cable tray must be listed by a nationally recognized testing laboratory as being flame retardant and marked for installation in cable tray. The marking may be "Type TC", "TC", "for use in cable trays", or "for CT use", depending on the voltage and construction. Low smoke. The NEC authorizes the addition of the suffix "LS" to the cable marking on any cable construction that is flame retardant and has limited smoke characteristics. The criteria for "Limited Smoke" was being developed at the time this recommended practice was published. While the NEC does not specifically require the use of "LS" constructions in any area, this requirement might be considered for occupancies with large populations or high-rise occupancies. Toxicity. All electrical wire and cable installed or terminated in any building in the State of New York after December 16, 1987, must have the toxicity level and certain other data for the product on file with the New York Secretary of State. The installation of cable in conformance with the NEC and state and local codes under the jurisdiction of a local electrical inspection authority requires evidence of Listing for use in the intended application and occupancy by a nationally recognized testing laboratory, such as Underwriters Laboratories (UL). Some of the more common industrial types listed in the NEC types are discussed in 12.2.4.1 through 12.2.4.4. 12.2.4.1 Low-voltage cables Low-voltage power cables are generally rated at 600 V, regardless of the voltage used, whether 120 V, 208 V, 240 V, 277 V, 480 V, or 600 V. The selection of 600 V power cable is oriented more toward physical rather than electrical service requirements. Resistance to forces, such as crush, impact, and abrasion becomes a predominant factor, although good electrical properties for wet locations are also needed. The 600 V compounds of cross-linked polyethylene (XLPE) are usually filled with carbon black or mineral fillers to further enhance the relatively good toughness of conventional polyethylene. The combination of cross-linking the polyethylene molecules through vulcanization plus fillers produces superior mechanical properties. Vulcanization eliminates polyethylene's main drawback of a relatively low melting point of 105 C. The 600 V construction consists of a copper or aluminum conductor with a single extrusion of insulation in the specified thickness. Rubber-like insulations, such as ethylene propylene rubber (EPR) and styrene butadiene rubber (SBR), require outer jackets for mechanical protection, usually of polyvinyl chloride (PVC), neoprene, or CP rubber. However, the newer EPR insulations have improved physical properties that do not require an outer jacket for mechanical protection. A list of the more commonly used 600 V conductors and cables is provided below. Cables are classified by conductor operating temperatures and insulation thicknesses in accordance with the NEC. EPR or XLPE insulated, with or without a jacket. Type RHW for 75 C maximum operating temperature in wet or dry locations, Type RHH for 90 C in dry locations only, and Type RHW-2 for 90 C maximum operating temperature in wet and dry locations. XLPE or EPR insulated, without jacket. Type XHHW for 75 C maximum operating temperature in wet locations and 90 C in dry locations only, and Type XHHW-2 for 90 C maximum operating temperature in wet and dry locations. PVC insulated, nylon jacketed. Type THWN for 75 C maximum operating temperature in wet or dry locations, and Type THHN for 90 C in dry locations only. PVC insulated, without jacket. Type THW for 75 C maximum operating temperature in wet or dry locations. The preceding conductors are suitable for installation in conduit, duct, or other raceway, and, when specifically approved for the purpose, may be installed in cable tray (1/0 AWG and larger) or direct-buried, provided NEC requirements are satisfied. Cables in items b and d are usually restricted to conduit or duct. Single conductors may be furnished paralleled or multiplexed, as multiconductor cables with an overall nonmetallic jacket or as aerial cable on a messenger. Metal-clad cable, Type MC. A multiconductor cable employing either an interlocking tape armor or a continuous metallic sheath (corrugated or smooth), with or without an overall jacket. The maximum temperature rating of the cable is based upon the temperature rating of the individual insulated conductors used, which are usually Type XHHW, XHHW-2, RHH/RHW, or RHW-2. Type MC cable may be installed in any raceway, in cable tray, as open runs of cable, direct buried, or as aerial cable on a messenger. Power and control tray cable, Type TC. A multiconductor cable with an overall flame-retardant nonmetallic jacket. The individual conductors may be any of the above and the cable has the same maximum temperature rating as the conductors used. Type TC may be installed in cable trays, raceways, or where supported in outdoor locations by a messenger wire. Note that the temperatures listed are the maximum rated operating temperatures as specified in the NEC. 12.2.4.2 Power-limited circuit cables When the power in the circuit is limited to the levels defined in Article 725 of the NEC for remote-control, signaling, and power-limited circuits, then Class 2 (CL2) or Class 3 (CL3) power-limited circuit cables or Power Limited Tray Cable (Type PLTC) may be utilized as the wiring method. These cables, which are rated 300 V, include copper conductors for electrical circuits and thermocouple alloys for thermocouple extension wire. Cables installed in ducts, plenums, and other spaces used for environmental air must be plenum cable Type CL2P or CL3P. Cables installed in vertical runs and penetrating more than one floor, or cables installed in vertical runs in a shaft must be riser cable Type CL2R or CL3R. Limited-Use Type CL2X or CL3X cables may be installed in dwellings or in raceway in buildings. Cables installed in cable tray must be Type PLTC. If the circuit is not Class 2 or Class 3 power-limited, then 600 V branch circuit conductors or cable must be used. Similarly power-limited fire-protective signaling circuit cable may be used on circuits that comply with the power limitations of Article 760 of the NEC. Type FPLP cable is required for plenums, Type FPLR cable for risers, and Type FPL cable for general-purpose fire alarm use. If the circuit is not power-limited, then 600 V cables must be used. Type NPLFP cable is required for plenums, Type NPLFR cable for risers, and Type NPLF cable for general- purpose fire alarm use. 12.2.4.3 Medium-voltage cables Type MV (medium voltage) power cables have solid extruded dielectric insulation and are rated from 200135 000 V. These single conductor and multiconductor cables are available with nominal voltage ratings of 5 kV, 8 kV, 15 kV, 25 kV, and 35 kV. Solid dielectric 69 kV and 138 kV transmission cables are also available, however, they are not listed in the NEC. EPR and XLPE are the usual insulating compounds for Type MV cables; however, polyethylene and butyl rubber are also available. The maximum operating temperatures are 90 C for EPR and XLPE, 85 C for butyl rubber, and 75 C for polyethylene. Type MV cables may be installed in raceways in wet or dry locations. The cable must be specifically listed for installation in cable tray, direct burial, exposure to sunlight, exposure to oils, or for messenger supported wiring. Multiconductor Type MV cables that also comply with the requirements for Type MC metal- clad cables may be labeled as Type MV or MC and may be installed as open runs of cable. 12.2.4.4 Shielding of medium-voltage cable For operating voltages below 2 kV, nonshielded constructions are normally used. Above 2 kV, cables are required to be shielded to comply with the NEC and ICEA standards. The NEC does permit the use of nonshielded cables up to 8 kV provided the conductors are listed by a nationally recognized testing laboratory and are approved for the purpose. Where non- shielded conductors are used in wet locations, the insulated conductor(s) must have an overall nonmetallic jacket or a continuous metallic sheath, or both. Refer to the NEC for specific insulation thicknesses for wet or dry locations. Since shielded cable is usually more expensive than nonshielded cable, and the more complex terminations require a larger terminal box, nonshielded cable has been used extensively at 2400 and 4160 V and occasionally at 7200 V. However, any of the following conditions may dictate the use of shielded cable: Personnel safety Single conductors in wet locations Direct earth burial Where the cable surface may collect unusual amounts of conducting materials (e.g., salt, soot, conductive pulling compounds) Shielding of an electric power cable is commonly referred to as the practice of confining the electric field of the cable to the insulation surrounding the conductor by means of conducting or semiconducting layers, or both, which are in intimate contact or bonded to the inner and outer surfaces of the insulation. In other words, the outer insulation shield confines the electric field to the space between the conductor and the shield. The inner or strand stress relief layer is at or near the conductor potential. The outer or insulation shield is designed to carry the charging currents and, in many cases, fault currents. The conductivity of the shield is determined by its cross-sectional area and the resistivity of the metal tapes or wires employed in conjunction with the semiconducting layer. The metallic shield, which is available in several forms, is an electrostatic shield and is not designed to carry fault currents. The most common is the tape shield consisting of a copper tape, 35 mils thick, which is helically applied over the insulation shield. A modification of the tape shield consists of a corrugated copper tape applied longitudinally over the insulation shield. This permits full electrical use of the tape as a current-carrying conductor, and it is capable of carrying a much greater fault current than a helically wrapped tape. Another type is a wire shield, where copper wires are helically applied over the insulation screen with a long lay. Typically, a wire shield will have 1520% less cross-sectional area than a tape shield. A modification of the wire shielding system consists of six corrugated copper drain wires embedded in an extruded black conducting chlorinated polyethlene (CPE) combination insulation shield and jacket. An extruded lead sheath may also be used as a combination shield and mechanical covering. The thickness of the lead can be varied to provide the desired cross-sectional area to carry the required fault current. The lead also provides an excellent moisture barrier for direct burial applications. The stress-control layer at the inner and outer insulation surfaces, by its close bonding to the insulation surface, presents a smooth surface to reduce the stress concentrations and minimize void formation. Ionization of the air in such voids can progressively damage insulating materials and eventually cause failure. Insulation shields have several purposes: To confine the electric field within the cable To equalize voltage stress within the insulation, minimizing surface discharges To protect cable from induced potentials To limit electromagnetic or electrostatic interference to communications receivers, e.g., radio, TV To reduce shock hazard (when properly grounded) Figure 12-3 illustrates the electrostatic field of a shielded cable.  Figure 12-3Electric field of shielded cable The voltage distribution between a nonshielded cable and a grounded plane is illustrated in figure 12-4. Here, it is assumed that the air is the same, electrically, as the insulation, so that the cable is in a uniform dielectric above the ground plane to permit a simpler illustration of the voltage distribution and field associated with the cable. In a shielded cable (see figure 12-3), the equipotential surfaces are concentric cylinders between conductor and shield. The voltage distribution follows a simple logarithmic variation, and the electrostatic field is confined entirely within the insulation. The lines of force and stress are uniform and radial and cross the equipotential surfaces at right angles, eliminating any tangential or longitudinal stresses within the insulation or on its surface.  Figure 12-4Electric field of conductor on ground plane in uniform dielectric The equipotential surfaces for the nonshielded system (see figure 12-5) are cylindrical but not concentric with the conductor and cross the cable surface at many different potentials. The tangential creepage stress to ground at points along the cable may be several times the normal recommended stress for creepage distance at terminations in dry locations for nonshielded cable operating on 4160 V systems.  Figure 12-5Electric field of nonshielded cable on ground plane Surface tracking, burning, and destructive discharges to ground could occur under these conditions. However, properly designed nonshielded cables, as described in the NEC, limit the surface energies available, which could protect the cable from these effects. Typical cables supplied for shielded and nonshielded applications are illustrated in figure 12-6. 12.3 Cable outer finishes Cable outer finishes or outer coverings are used to protect the underlying cable components from the environmental and installation conditions associated with the intended service. The choice of a cable outer finish for a particular application is based on the same performance criteria as used for insulations, namely electrical, thermal, mechanical, and chemical. A combination of metallic and nonmetallic coverings are available to provide the total protection needed for the particular installation and operating conditions. Specific industry requirements for these coverings are defined in IEEE, UL, ICEA, and ASTM Standards. 12.3.1 Nonmetallic finishes Extruded Jackets. There are outer coverings, either thermoplastic or vulcanized, that may be extruded directly over the insulation, or over electrical shielding systems of metal sheaths or tapes, copper braid, or semiconducting layers with copper drain wires or spiraled copper concentric wires, or over multiconductor constructions. Commonly used materials include polyvinyl chloride (PVC), chlorinated polyethylene (CPE), nitrile butadiene/polyvinyl chloride (NBR/PVC), cross-linked polyethylene (XLPE), polychloroprene (neoprene), and chlorosulfonated polyethylene (hypalon). While the detailed characteristics may vary due to individual manufacturers' compounding, these materials provide a high degree of moisture, chemical, and weathering protection, are reasonably flexible, provide some degree of electrical isolation, and are of sufficient mechanical strength to protect the insulating and shielding components from normal service and installation damage. Materials are available for service temperatures from 55 C to +115 C. Fiber braids. This category includes braided, wrapped, or served synthetic or natural fiber materials selected by the cable manufacturer to best meet the intended service. While asbestos fiber has been the most common material used in the past, fiberglass is now used extensively for employee health reasons. Some special industrial applications may require synthetic or cotton fibers applied in braid form. All fiber braids require saturants or coating and impregnating materials to provide some degree of moisture and solvent resistance as well as abrasive and weathering resistance. Glass braid is used on cables to minimize flame propagation, smoking, and other hazardous or damaging products of combustion. 12.3.2 Metallic finishes This category of materials is widely used where a high degree of mechanical, chemical, or short-time thermal protection of the underlying cable components is required by the application. Commonly used materials are interlocked galvanized steel, aluminum, or bronze armor; extruded lead or aluminum; longitudinally applied, welded, and corrugated aluminum or cop  Figure 12-6Commonly used shielded and nonshielded constructions per sheath; and helically applied round or flat armor wires. The use of any of these materials, alone or in combination with others, does reduce flexibility of the overall cable. Installation and operating conditions may involve localized compressive loadings, occasional impact from external sources, vibration and possible abrasion, heat shock from external sources, extended exposure to corrosive chemicals, and condensation. Interlocked armor. Provides mechanical protection with minimum reduction in flexibility. While not entirely impervious to moisture or corrosive agents, interlocked armor does provide mechanical protection against impact and abrasion and protection from thermal shock by acting as a heat sink for short periods of localized exposure. When moisture protection is required, an inner jacket over the cable core and under the armor is required. If an inner jacket is not used, 600 V cables in wet locations can only be rated for 75 C unless the newer RHW-2 or XHHW-2 conductors are used, in which case the cable can then be rated 90 C wet or dry. Where corrosion resistance is required for either environmental conditions, direct burial, or embedment in concrete, an overall jacket is required. The use of interlocked galvanized steel armor should be avoided on single-conductor ac power circuits due to the high hysteresis and eddy current losses. This effect, however, is minimized by using three conductor cables with overall armor or with aluminum armor on single conductor cables. Commonly used interlocked armor materials are galvanized steel, aluminum (for less weight and corrosion resistance), marine bronze, and other alloys for highly corrosive atmospheres. Corrugated metal sheath. Longitudinally welded and corrugated metal sheaths (corrugations formed perpendicular to the cable axis) have been used for many years in direct buried communications cables, but only since 1960 has this method of cable core protection been applied to control and power cable. The sheath material may be of copper, aluminum, copper alloy, or a bimetallic composition with the choice of material selected to best meet the intended service. The corrugated metal sheath offers mechanical protection equal or greater than interlocked armor but at a lower weight. The aluminum or copper sheath may also be used as the equipment grounding conductor, either alone or in parallel with a grounding conductor within the cable. The sheath is made from a metal strip that is longitudinally formed around the cable, welded into a continuous, impervious metal cylinder, and corrugated for pliability and increased radial strength. This sheath offers maximum protection from moisture and liquid or gaseous contaminants. An extruded nonmetallic jacket must be used over the metal sheath for direct burial, embedment in concrete, or in areas that are corrosive to the metal sheath. This cable construction is always rated 90 C in wet or dry locations. Lead. Pure or lead alloy is occasionally used for power cable sheaths for moisture protection in underground manhole and tunnel, or underground duct distribution systems subject to flooding. While not as resistant to crushing loads as interlocked armor or a corrugated metal sheath, its very high degree of corrosion and moisture resistance makes lead attractive in these applications. Protection from installation damage can be provided by an outer jacket of extruded material. Pure lead is subject to work hardening and should not be used in applications where flexing may be involved. Copper- or antimony-bearing lead alloys are not as susceptible to work hardening as pure lead, and may be used in applications involving limited flexing. Lead or its alloys must never be used for repeated flexing service. One problem encountered today with the use of lead sheathed cable is in the area of splicing and terminating. Installation personnel experienced in the art of wiping lead sheath joints are not as numerous as they were many years ago, which poses an installation problem for many potential users. However, many insulation systems do not require lead sleeves at splices and treat the lead like any other metallic sheath. Aluminum or copper. Extruded aluminum or copper sheaths, or die-drawn aluminum or copper sheaths, are used in certain applications for weight reduction and moisture penetration protection. While more crush-resistant than lead, aluminum sheaths are subject to electrolytic attack when installed underground. Under these conditions aluminum sheathed cable should be protected with an extruded outer jacket. Mechanical splicing sleeves are available for use with aluminum sheathed cables, and sheath joints can be made by inert gas welding, provided that the underlying components can withstand the heat of welding without deterioration. Specifically designed hardware is available for terminating the sheath at junction boxes and enclosures. Wire armor. Significant mechanical protection and particularly longitudinal strength can be obtained with the use of spirally wrapped or braided round steel armor wire. This type of outer covering is frequently used in submarine cable and vertical riser cable for mechanical protection and support. As noted for steel interlocked armor, this form of protection should be used only on three conductor power cables to minimize sheath losses. 12.3.3 Single and multiconductor constructions Single conductor cables are usually easier to handle and can be furnished in longer lengths as compared to multiconductor cables. The multiconductor constructions have smaller overall dimensions than the same number of single conductor cables, which can be an advantage where space is important. Sometimes the outer finish can influence whether the cable should be supplied as a single or multiconductor cable. For example, as mentioned previously, the use of steel interlocked or steel wire armor on ac cables is practical on multiconductor constructions, but should be avoided on single conductor cables. It is also more economical to apply a metallic sheath or armor over multiconductor constructions rather than over each of the single conductor cables. 12.3.4 Physical properties of materials for outer coverings Depending on the environment and application, the selection of outer finishes to provide the degree of protection needed can be complex. For a general appraisal, table 12-4 lists the relative properties of some commonly used materials. Table 12-4Properties of jackets and braids MaterialAbrasion resistanceFlexibilityLow temperatureHeat resistanceFire resistanceNeopreneGoodGoodGoodGoodGoodClass CP rubber*GoodGoodFairExcellentGoodCross-linked polyethyleneGoodPoorPoorExcellentPoorPolyvinyl chlorideFairGoodFairGoodFairPolyurethaneExcellentGoodGoodGoodPoorGlass braidFairGoodGoodExcellentExcellentNylonExcellentFairGoodGoodFairETFEExcellentPoorExcellentGoodFair NOTEChemical resistance and barrier properties depend on the particular chemicals involved, and the question should be referred to the cable manufacturer. *For example, Hypalon. 12.4 Cable ratings 12.4.1 Voltage rating The selection of the cable insulation (voltage) rating is made on the basis of the phase-tophase voltage of the system in which the cable is to be applied, whether the system is grounded or ungrounded, and the time in which a ground fault on the system is cleared by protective equipment. It is possible to operate cables on ungrounded systems for long periods of time with one phase grounded due to a fault. This results in line-to-line voltage stress across the insulation of the two ungrounded conductors. Therefore, such cable must have greater insulation thickness than a cable used on a grounded system where it is impossible to impose full line-to-line potential on the other two unfaulted phases for an extended period of time. Therefore, 100% insulation level cables are applicable to grounded systems provided the protection devices will clear ground faults within 1 min. On ungrounded systems where the clearing time of the 100% level category cannot be met, and yet there is adequate assurance that the faulted section will be cleared within 1 h, 133% insulation level cables are required. On systems where the time required to de-energize a grounded section is indefinite, a 173% insulation level is used. 12.4.2 Conductor selection The selection of conductor size is based on the following considerations: Load current criteria as related to loadings, the NEC requirements, thermal effects of the load current, mutual heating, losses produced by magnetic induction, and dielectric losses Emergency overload criteria Voltage drop limitations Fault current criteria Frequency criteria Hot-spot temperature criteria Length of cable in elevated ambient temperature areas Equipment termination requirements 12.4.3 Load current criteria The ampacity tables in the NEC for low- and medium-voltage cables must be used where the NEC applies. These are derived from IEEE S-135. All ampacity tables show the minimum conductor size required, but conservative engineering practice, future load growth considerations, voltage drop, and short-circuit heating may make the use of larger conductors necessary. Large groups of cables should be carefully considered, as deratings due to mutual heating may be limiting. Conductor sizes over 500 kcmil require the consideration of paralleling two or more smaller size cables because the current-carrying capacity per circular mil of conductor decreases for ac circuits due to skin effect and proximity effect. The reduced ratio of surface to cross-sectional area of the larger conductors is a factor in the reduced ability of the larger conductor to dissipate heat. When multiple cables are used, consideration must be given to the phase placement of the cables to minimize the effects of maldistribution of current in the cables, which will also reduce ampacity. Although the material cost of cable may be less for two smaller conductors, this cost saving may be offset by increased installation costs. The use of load factor in underground runs takes into account the heat capacity of the duct bank and surrounding soil, that responds to average heat losses. The temperatures in the underground section will follow the average loss, thus permitting higher short-period loadings. The load factor is the ratio of average load to peak load. The average load is usually measured on a daily basis; the peak load is the average of a 30 min to 1 h period of the maximum loading that occurs in 24 h. For direct buried cables, the average cable surface temperature is limited to 60 C to 70 C, depending on soil conditions, to prevent moisture migration and thermal runaway. Cables must be derated when in proximity to other loaded cables or heat sources, or when the ambient temperature exceeds the ambient temperature on which the ampacity (current-carrying capacity) tables are based. The normal ambient temperature of a cable installation is the temperature the cable would assume at the installed location with no load being carried on the cable. A thorough understanding of this temperature is required for a proper determination of the cable size required for a given load. For example, the ambient temperature for a cable exposed in the air and isolated from other cables is the temperature of that cable before load is applied, assuming, of course, that this temperature is measured at the same time of day and with all other conditions exactly the same as they will be when the required load is being carried. It is also assumed that, for cables in air, the space around the cable is large enough so that the heat generated by the cable can be dissipated without raising the temperature of the room as a whole. Unless exact conditions are specified, the following ambients are commonly used for calculation of current-carrying capacity. Indoors. The ampacity tables in the NEC are based upon an ambient temperature of 30 C for low-voltage cables. In most parts of the United States, 30 C is too low for summer months, at least for some parts of the building. The Type MV cable ampacity tables in the NEC are based upon a 40 C ambient air temperature. In any installation where the conditions are accurately known, the measured temperature should be used; otherwise, use 40 C. Refer to NEC Article 318 for cables installed in cable tray. Sources of heat adjacent to the cables under the most adverse condition should be taken into consideration when calculating the current-carrying capacity. This is usually done by correcting the ambient temperature for localized hot spots. These may be caused by steam lines or other heat sources adjacent to the cable, or they may be due to sections of the cable running through boiler rooms or other hot locations. Rerouting may be necessary to avoid this problem. Outdoors. An ambient temperature of 40 C is commonly used as the maximum for cables installed in the shade and 50 C for cables installed in the sun. In using these ambient temperatures, it is assumed that the maximum load occurs during the time when the ambient temperature will be as specified. Some circuits probably do not carry their full load during the hottest part of the day or when the sun is at its brightest, so that an ambient temperature of 40 C for outdoor cables is probably reasonably safe for certain selected circuits; otherwise, use 50 C. Refer to the NEC Article 310 ampacity tables and associated notes for the calculations to be used for outdoor installations and Article 318 for cables installed in cable tray. c) Underground. The ambient temperature used for underground cables varies in different sections of the country. For the northern sections, an ambient temperature of 20 C is commonly used. For the central part of the country, 25 C is commonly used, while for the extreme south and southwest, an ambient of 30 C may be necessary. The exact geological boundaries for these ambient temperatures cannot be defined, and the maximum ambient should be measured in the earth at a point away from any sources of heat at the depth at which the cable will be buried. Changes in the earth ambient temperature will lag changes in the air ambient temperature by several weeks. The thermal characteristics of the medium surrounding the cable are of primary importance in determining the current-carrying capacity of the cable. The type of soil in which the cable or duct bank is buried has a major effect on the current-carrying capacity of cables. Porous soils, such as gravel and cinder fill, usually result in a temperature increase and lower ampacities than normal sandy or clay soil. The type of soil and its thermal resistivity should be known before the size of the conductor is calculated. The moisture content of the soil has a major effect on the current-carrying capacity of cables. In dry sections of the country, cables may have to be derated or other precautions taken to compensate for the increase in thermal resistance due to the lack of moisture. On the other hand, in ground which is continuously wet or under tidewater conditions, cables may safely carry higher than normal currents. Shielding for even 2400 V circuits is necessary for continuously wet or alternately wet and dry conditions. Where the cable passes from a dry area to a wet area, which provides natural shielding, there will be an abrupt voltage gradient stress, just as at the end of shielded cables terminated without a stress cone. Nonshielded cables specifically designed for this service are available. Alternate wet and dry conditions have also been found to accelerate the progress of water treeing in solid dielectric insulations. Ampacities in the NEC tables take into account the grouping of adjacent circuits. For ambient temperatures different from those specified in the tables, more than three conductors in a cable or raceway, or other installation conditions, the derating factors to be applied are contained in Tables 3 10-16 through 3 10-19, "Notes to Ampacity Tables of 0 to 2000 V,' and "Notes to Tables 3 10-69 through 310-84.' 12.4.4 Emergency overload criteria The normal loading limits of insulated wire and cable are based on many years of practical experience and represent a rate of deterioration that results in the most economical and useful life of such cable systems. The rate of deterioration is expected to result in a useful life of 20 30 years. The life of cable insulation is about halved, and the average rate of thermally caused service failures about doubled for each 5 C to 15 C increase in normal daily load temperature. Additionally, sustained operation over and above maximum rated operating temperatures or ampacities is not a very effective or economical expedient because the temperature rise is directly proportional to the conductor loss, which increases as the square of the current. The greater voltage drop might also increase the risks to equipment and service continuity. As a practical guide, the Insulated Cable Engineers Association (ICEA) has established maximum emergency overload temperatures for various insulations. Operation at these emergency overload temperatures should not exceed 100 hours/year, and such 100 hour overload periods should not exceed five during the life of the cable. Table 12-5 provides uprating factors for short-time overloads for various types of insulated cables. The uprating factor, when multiplied by the nominal current rating for the cable in a particular installation, will give the emergency or overload current rating for the particular insulation. A more detailed discussion on emergency overload and cable protection is contained in IEEE Std 242-1986, Chapter 11. 12.4.5 Voltage drop criteria The supply conductor, if not of sufficient size, will cause excessive voltage drop in the circuit, and the drop will be in direct proportion to the circuit length. Proper starting and running of motors, lighting equipment, and other loads that have heavy inrush currents must be considered. The NEC recommends that the steady-state voltage drop in power, heating, or lighting feeders be no more than 3%, and the total drop including feeders and branch circuits be no more than 5% overall. 12.4.6 Fault current criteria Under short-circuit conditions, the temperature of the conductor rises rapidly. Then, depending upon the thermal characteristics of the insulation, sheath, surrounding materials, etc., the conductor cools off slowly after the short-circuit condition is removed. For each insulation, the ICEA recommends a transient temperature limit for short-circuit duration times not in excess of 10 seconds. Failure to check the conductor size for short-circuit heating could result in permanent damage to the cable insulation due to disintegration of the insulation material, which may be accompanied by smoke and generation of combustible vapors. These vapors will, if sufficiently heated, ignite, possibly starting a fire. Less seriously, the insulation or sheath of the cable may be expanded to produce voids leading to subsequent failure. This becomes especially important in cables rated 5 kV and higher. In addition to the thermal stresses, mechanical stresses are set up in the cable through expansion when heated. As the heating is usually very rapid, these stresses may result in undesirable cable movement. However, on modern cables, reinforcing binders and sheaths considerably reduce the effect of such stresses. Within the range of temperatures expected with coordinated selection and application, the mechanical aspects can normally be discounted except with very old or lead sheathed cables. During short-circuit or heavy pulsing currents, single-conductor cables will be subjected to forces that tend to either attract or repel the individual conductors with respect to each other. Therefore, cables installed in cable trays, racks, switchgear, motor control centers, or switchboard cable compartments, should be secured to prevent damage caused by such movements.  The minimum conductor size requirements for various rms short-circuit currents and clearing times are shown in table 12-6. The initial and final conductor temperatures from ICEA P-32- 382 (1969), are shown for the various insulations. Table 12-3 provides conductor temperatures (maximum operating, maximum overload, and maximum short-circuit current) for various insulated cables. The shield can be damaged if exposed to excessive fault currents. ICEA P-45-482 (1979) 1 recommends that the ground-fault current not exceed 2000 A for / 2 s. Some lighter duty shield constructions may have a lower current limit; check with the cable manufacturer. To limit ground-fault shield conductor exposure, the recommended practice is to utilize current- limiting overcurrent protective devices or employ low-resistance grounded supply systems for a maximum ground-fault current of 400 to 2000 A with suitably sensitive relaying. Without such limiting, it is likely that the occurrence of a ground fault could require replacement of substantial lengths of cable. Grounding of the shield at all splice and termination points will direct fault currents into multiple paths and reduce shield damage. A more detailed discussion of fault current and cable protection is contained in IEEE Std 242-1986. 12.4.7 Frequency criteria In general, three-phase, 400 Hz power systems are designed in the same way as 60 Hz systems; however, the specifier must be aware that the higher frequency will increase the skin and proximity effects on the conductors, thereby increasing the effective copper resistance. For a given current, this increase in resistance results in increased heating and may require a larger conductor. The higher frequency will also increase the reactance, and this, combined with the increased resistance, will increase the voltage drop. The higher frequency will also increase the effect of magnetic materials upon cable reactance and heating. For this reason, the cables should not be installed in steel or magnetic conduit, steel wireway, or run along magnetic structural members within the building. The curves in figure 12-7 show the ac/dc resistance ratio which exists on a 400 Hz system and the resulting reduction in current rating which is necessary from a heating standpoint to counteract the effect of the increased frequency. The reactance can be taken as directly proportional to the frequency without introducing any appreciable errors. This method of determining reactance does not take into account the reduction due to proximity effect, but this change is not large and the error introduced by neglecting it is small. The curves are applicable to any 600 V cable in the same nonmagnetic conduit, or to any Type MC cable with an aluminum or bronze sheath or interlocking armor. When voltage drop is the limiting factor, then paralleling smaller conductors should be considered.   Figure 12-7AC/DC resistance ratio on a 400 Hz system 12.4.8 Elevated ambient temperature The ambient temperature of the area where cables are installed must be considered in determining the allowable ampacity of the circuit. Cables and insulated conductors rated 2000 V or less, installed in areas where the ambient temperature is higher than that permitted in NEC Tables 310-16 through 310-19, must have the allowable ampacity reduced by the ampacity correction factors listed in appropriate table. The ampacity of cables and insulated conductors rated over 2000 V, installed in areas where the ambient temperature is either higher or lower than the temperatures specified in NEC Tables 310-69 through 310-84, may be determined by using the formula contained in Note 1 of "Notes to Tables 3 10-69 through 310-84.' 12.4.9 Hot-spot temperature criteria The allowable ampacity of a cable or insulated conductor must be reduced whenever more than 6 ft of the run is in a higher ambient temperature area. Refer to 12.4.8 for the applicable correction factors. 12.4.10 Termination criteria Equipment termination requirements must be considered; e.g., the manufacturer of a circuit breaker may specify a minimum conductor size for a particular breaker rating. Also, on 600 V terminations, the rating of the termination may require the cable to be operated at a lower temperature, 60 C or 75 C. 12.5 Installation There are a variety of ways to install power distribution cables in industrial facilities. The engineer's responsibility is to select the method most suitable for each particular application. Each method has characteristics that make it more suitable for certain conditions than others; that is, each method will transmit power with a unique combination of reliability, safety, economy, and quality for a specific set of conditions. These conditions include the quantity and characteristics of the power being transmitted, the distance of transmission, and the degree of exposure to adverse mechanical and environmental conditions. 12.5.1 Layout The first consideration in wiring systems layout is to keep the distance between the source and the load as short as possible. This consideration should be tempered by many other important factors to arrive at the lowest cost system that will operate within the reliability, safety, economy, and performance required. Some other factors that must be considered for various routings are the cost of additional cable and raceway versus the cost of additional supports; inherent mechanical protection provided in one alternative versus additional protection required in another; clearance for and from other facilities; and the need for future revision. 12.5.2 Open wire This method was used extensively in the past. Although it has now been replaced in most applications, it is still quite often used for primary power distribution over large areas where conditions are suitable. Open-wire construction consists of single conductors on insulators that are mounted on poles or structures. The conductors may be bare or have a covering or jacket for protection against corrosion or abrasion. The attractive features of this method are its low initial cost and the fact that damage can be detected and repaired quickly. On the other hand, the noninsulated conductors are a safety hazard and are also very susceptible to mechanical damage and electrical outage from birds, animals, lightning, etc. There is an increased safety hazard where crane or boom truck use may be involved. In some areas, insulator contamination or conductor corrosion can result in increased maintenance costs. Due to the large conductor spacing, open wire circuits have a higher reactance than circuits with more closely spaced conductors, producing a larger voltage drop. This problem is reduced by operating at a higher voltage and higher power factor. Exposed open wire circuits are more susceptible to outages from lightning than other installation methods. The problem may be minimized through the use of overhead ground wires, surge arresters, or special insulators. 12.5.3 Aerial cable Aerial cable is usually used for incoming or service distribution between commercial buildings. As a logical replacement for open wiring, it provides greater safety and reliability and requires less space. Properly protected cables are not a safety hazard and are not easily damaged by casual contact. They are, however, open to the same objections as open wire in regard to vertical and horizontal clearances. Aerial cables are frequently used in place of the more expensive conduit systems, where the mechanical protection of the conduit is not required. They are also generally more economical for long runs of one or two cables than are cable tray installations. It is cautioned that aerial cable having a portion of the run in conduit must be derated to the ampacity in conduit for this condition. Aerial cables may be either self-supporting or messenger-supported. They may be attached to pole lines or structures. Self-supporting aerial cables have high tensile strength conductors for this application. Multiple single conductors, Types MV, THW, RHH or RHW, both without outer braids; or multiconductor cables, Types MI, MC, SE, UF, TC, MV, or other factory-assembled multi- conductor control, signal, or power cables that are identified for the use in NEC, Article 321, may be messenger-supported. Cables may be messenger-supported either by spirally wrapping a steel band around the cables and the messenger or by pulling the cable into rings suspended from the messenger. The spiral wrap method is used for factory-assembled cable, while both methods are used for field assembly. A variety of spinning heads are available for application of the spiral wire banding in the field. The messenger used on factory-assembled messenger-supported wiring is required to be copper-covered steel or a combination of copper-covered steel and copper, and the assembly must be secured to the messenger by a flat copper binding strip. Single insulated conductors should be cabled together. Factory-preassembled aerial cables are particularly susceptible to installation damage from high stress at support sheaves while being pulled in. Self-supporting cable is suitable for only relatively short spans. Messenger-supported cable can span longer distances, depending on the weight of the cable and the tensile strength of the messenger. The supporting messenger provides the strength to withstand climatic rigors or mechanical shock. The messenger must be grounded in accordance with the NEC. A convenient feature available in one form of factory assembled aerial cable makes it possible to form a slack loop to connect a circuit tap without cutting the cable conductors. This is done by reversing the direction of spiral of the conductor cabling every 1020 ft. Spacer cable is an electric distribution line construction that consists of an assembly of one or more covered conductors separated from each other and supported from a messenger by insulating spacers. This is another economical means of transmitting power overhead between buildings. Available for use in three-phase 515 kV grounded or ungrounded systems, the insulated nonshielded phase conductors provide protection from accidental discharge through contact with ground level equipment, such as aerial ladders or crane booms. Uniform-line electrical characteristics are obtained through the balanced geometric positioning of the conductors with respect to each other by the use of plastic or ceramic spacers located at regular intervals along the line. Low terminating costs are obtained because the conductors are non- shielded. 12.5.4 Open runs This is a low-cost method where adequate support surfaces are available between the source and the load. It is most useful in combination with other methods, such as branch runs from cable trays, and when adding new circuits to existing installations. This method employs multiconductor cable attached to surfaces, such as structural beams and columns. Type MC cable is permitted to be installed in this manner in industrial facilities as well as power-limited control and telephone circuits. For architectural reasons in office buildings, it is usually limited to service areas, above hung ceilings, and electric shafts. 12.5.5 Cable tray A cable tray is defined in the NEC as a unit or assembly of units or sections, and associated fittings, forming a rigid structural system used to support cables and raceways." These supports include ladders, troughs, and channels, and have become very popular in industrial electric systems for the following reasons: low installation cost, system flexibility, improved reliability, accessibility for repair or addition of cables, and space saving when compared with conduit where a larger number of circuits with common routing are involved. Cable trays are available in a number of styles, materials, and mechanical load-carrying capabilities. Special coatings or materials for corrosion protection are available. Initial planning of a cable tray should consider occupancy requirements as given in the NEC and also allow additional space for future system expansion. Covers, either ventilated or nonventilated, may be used when additional mechanical protection is required or for additional electrical shielding when communication circuits are involved. Where cable trays are continuously covered for more than 6 ft with solid, unventilated covers, the cable ampacity rating must be derated as required by the NEC, Section 318. A solid fixed barrier is required for separation of cables rated over 600 V from those rated 600 V or less. Barrier strips are not required when the cables over 600 V are Type MC. Seals or fire stops may be required when passing through walls, partitions, or elsewhere to minimize flame propagation. In stacked tray installations, it is good practice to separate voltages, locating the lowest voltage cables in the bottom tray and increasingly higher voltage cables in ascending order of trays. In a multiphase system, all phase conductors should be installed closely grouped in the same tray. A cable tray provides a convenient economical support method when more than three cables are being routed in the same direction. Single conductors of size 1/0 AWG and larger, that are identified for the use, are permitted in cable tray in industrial establishments. Type MC cable can be installed in cable tray and, when only one or two cables have to be routed to a separate location, the cable can then be installed as open runs of cable. Type TC cable, as well as single conductors, requires the use of a raceway between the cable tray and the termination point. The steel or aluminum metal in a cable tray can also be used as an equipment grounding conductor when the tray sections are listed by a nationally recognized testing laboratory as having adequate cross-sectional area and are bonded using mechanical connectors or bonding jumpers. Refer to the NEC, Section 318-7, for complete requirements. 12.5.6 Cable bus Cable bus is used for transmitting large amounts of power over relatively short distances. It is a more economical replacement of conduit or busway systems, but more expensive than cable tray. Cable bus is also more reliable, safer, and requires less maintenance than open- wire or bus systems. Cable bus is a hybrid between cable tray and busway. It uses insulated conductors in an enclosure that is similar to cable tray with covers. The conductors are supported at maintained spacings by nonmetallic spacer blocks. Cable buses are furnished either as components for field assembly or as completely assembled sections. The use of completely assembled sections is recommended when the run is short enough that splices may be avoided. Multiple sections requiring joining may preferably employ the continuous conductors. The conductors are generally spaced one cable diameter apart so that the rating in air may be attained. This spacing is also close enough to provide low reactance, resulting in minimum voltage drop. 12.5.7 Conduit Among conduit systems, rigid steel provides the greatest degree of mechanical protection available in above-ground conduit systems. Unfortunately, this is also a relatively high cost system. For this reason, it is being replaced, where possible, by other types of conduit and wiring systems. Where applicable, rigid aluminum, rigid nonmetallic conduit (NMC), electrical metallic tubing (EMT), intermediate metal conduit (IMC), electrical nonmetallic tubing (ENMT), and plastic, fiberglass, and cement ducts may be used. Cable trays and open runs of Type MC cable are also being utilized. Conduit systems offer some degree of flexibility in permitting replacement of existing conductors with new ones. However, in case of fire or short-circuit current faults, it may be impossible to remove the conductors. In this case, it is necessary to replace both conduit and wire at great cost and delay. Also, during fires, conduits may transmit corrosive fumes into equipment where these gases can do a lot of damage. To keep flammable gases out of such areas, seals must be installed. With magnetic conduits, an equal number of conductors of each phase must be installed in each conduit; otherwise, losses and heating will be excessive. For example, a single conductor should not be installed in steel conduit. Refer to the NEC for regulations on conduit use. Underground ducts are used where it is necessary to provide good mechanical protection. For example, when overhead conduits are subject to extreme mechanical abuse or when the cost of going underground is less than providing overhead supports. In the latter case, direct burial (without conduit) may be satisfactory under certain circumstances. Underground ducts use rigid steel, plastic, or fiberglass conduits encased in concrete, or precast with multihole concrete duct banks with close fitting joints. When the added mechanical protection of concrete is not required, heavy wall versions of fiberglass conduits are direct buried as are rigid steel and plastic conduits. Medium-voltage, low-voltage, signal and communications systems should not be installed in the same manhole. Manholes intended for cable splices or for drain provisions on long length cables should have adequate provisions for grounding. Cables used in underground conduits must be suitable for use in wet areas. Some cost savings can be realized by using flexible plastic conduits with factory installed conductors. Where a relatively long distance between the point of service entrance into a building and the service entrance protective device is unavoidable, the requirements of the NEC, Section 230-6, apply. The conductors must be placed under at least 2 in of concrete beneath the building; or they must be placed in conduit or duct and enclosed by concrete or brick not less than 2 in thick. They are then considered outside the building. 12.5.8 Direct burial Cables may be buried directly in the ground where permitted by the NEC when the need for future maintenance along the cable run is not anticipated nor the protection of conduit required. The cables used must be suitable for this purpose; that is, they must be resistant to moisture, crushing, soil contaminants, and insect and rodent damage. Direct buried cables rated over 600 V must be shielded and provide an exterior ground path for personnel safety in the event of accidental dig-in. Multiconductor nonshielded Type MC cables rated up to 5000 V are also permitted to be direct buried. Refer to the NEC, Tables 300-5 and 7 10-3(b), for minimum depth requirements. The cost savings of this method over duct banks can vary from very little to a considerable amount. Cable trenching or burying machines, when appropriate, can significantly reduce the installation cost of direct buried cable, particularly in open field construction, such as in industrial parks. While this system cannot readily be added to or maintained, the current- carrying capacity of a cable of a given size is usually greater than that for cables in ducts. Buried cable must have selected backfill for suitable heat dissipation. It should be used only when the chances of its being disturbed are minimal or it should be suitably protected. Relatively recent advances in the design and operating characteristics of cable fault location equipment and subsequent repair methods and material have diminished the maintenance mean time to repair. 12.5.9 Hazardous (classified) locations Wire and cable installed in locations where fire or explosion hazards may exist must comply with the NEC, Articles 500 through 517. The authorized wiring methods are dependent upon the Class and Division of the specific area (see table 12-7). The wiring method must be approved for the class and division, but is not dependent upon the group, which defines the hazardous substance. Equipment and the associated wiring system approved as intrinsically safe is permitted in any hazardous location for which it has been approved. However, the installation must prevent the passage of gases or vapors from one area to another. Intrinsically safe equipment and wiring is not capable of releasing sufficient electrical or thermal energy under normal or abnormal conditions to cause ignition of a specific flammable or combustible atmospheric mixture in its most easily ignitable concentration. Seals must be provided in the wiring system to prevent the passage of the hazardous atmosphere along the wiring system from one division to another or from a Division I or II hazardous location to a nonhazardous location. The sealing requirements are defined in the NEC, Articles 501 through 503. The use of multiconductor cables with a gas/vaportight continuous outer sheath, either metallic or nonmetallic, can significantly reduce the sealing requirements in Class 1, Division 2 hazardous locations. 12.5.10 Installation procedures Care must be taken in the installation of raceways to ensure that no sharp edges exist to cut or abrade the cable as it is pulled in. Another important consideration is to not exceed the maximum allowable tensile strength or the manufacturer's recommendation for the maximum sidewall pressure of a cable. These forces are directly related to the force exerted on the cable while it is being pulled in. The forces can be decreased by shortening the length of each pull and reducing the number of bends. The force required for pulling a given length can be Table 12-7Wiring methods for hazardous locations Wiring methodClass I divisionClass II divisionClass III division12121 or 2Threaded rigid metal conduitXXXXXThreaded steel intermediate metal conduitXXXXXRigid metal conduitXXIntermediate metal conduitXXElectrical metallic tubingXXRigid nonmetallic conduitXType MI mineral insulated cableXXXXXType MC metal-clad cableXXXType SNM shielded nonmetallic cableXXXType MV medium-voltage cableXType TC power and control tray cableXType PLTC power-limited tray cableXEnclosed gasketed busways or wirewaysXDust-tight wirewaysXX Source: Based on the NEC. reduced by the application of a pulling compound on cables in conduit and the use of rollers in cable trays. When the cable is to be pulled by the conductors, the maximum tension in pounds is limited to 0.008 times the area of the conductors, in circular mils, within the construction. The allowable tension should be reduced by 2040% when several conductors are being pulled simultaneously since the tension is not always evenly distributed among the conductors. This allowable tension must be further reduced when the cable is pulled by a grip placed over the outer covering. A reasonable figure for most jacketed constructions would be 1000 lb per grip; but the calculated conductor tension should not be exceeded. Pulling eyes, connected to each conductor, provide the maximum allowable pulling tension. Reusable pulling eyes are available. Sidewall pressures on most single conductors limit pulling tensions to approximately 450 lb times the cable diameter (inches) times the radius of the bend (feet). Triplexed and paralleled cables would use their single conductor diameters and a factor of 225 lb and 675 lb, respectively, instead of the 450 lb factor for a single conductor. For duct installations involving many bends, it is preferable to feed the cable into the end closest to the majority of the bends (since the friction through the longer duct portion without the bends is not yet a factor) and pull from the other end. Each bend gives a multiplying factor to the tension it sees; therefore, the shorter runs to the bends will keep this increase in pulling tensions to a minimum. However, it is best to calculate pulling tensions for installation from both ends of the run and install from the end requiring the least tension. The minimum bending radii is 8 times the overall cable diameter for nonshielded single and multiconductor cables and 12 times for metal tape shielded or lead covered cables. The minimum bending radius for nonshielded Type MC cable with interlocking armor or a corrugated sheath is 7 times the overall diameter of the metallic sheath; for shielded cables, the minimum bending radius is 12 times the overall diameter of one of the individual conductors or 7 times the overall diameter of the multiconductor cable, whichever is greater. Type MC cable with a smooth metallic sheath requires a greater minimum bending radius; refer to the NEC, Section 334-11. The minimum bending radius is applicable to bends of even a fraction of an inch in length, not just the average of a long length being bent. When installing cables in wet underground locations, the cable ends must be sealed to prevent entry of moisture into the conductor strands. These seals should be left intact or remade after pulling if disrupted, until splicing, terminating, or testing is to be done. This practice is recommended to avoid unnecessary corrosion of the conductors and to safeguard against entry of moisture into the conductor strands, which would generate steam under overload, emergency loadings, or short-circuit conditions after the cable is energized. 12.6 Connectors 12.6.1 Types available Connectors are classified as thermal or pressure, depending upon the method used to attach them to the conductor. Thermal connectors use heat to make soldered, silver soldered, brazed, welded, or cast-on terminals. Soldered connections have been used with copper conductors for many years, and their use is well understood. Aluminum connections may also be soldered satisfactorily with the proper materials and technique. However, soldered joints are not commonly used with aluminum. Shielded arc welding of aluminum terminals to aluminum cable makes a satisfactory termination for cable sizes larger than 4/0 AWG. Torch brazing and silver soldering of copper cable connections are in use, particularly for underground connections with bare con- ductors such as in grounding mats. Exothermic welding kits utilizing carbon molds are also used for making connections with bare copper or bimetallic (copperweld) cable for ground mats and for junctions that will be below grade. These are satisfactory as long as the conductors to be joined are dry and the welding charge and tool are proper. The exothermic welding process has also proved satisfactory for attaching connectors to insulated power cables. Mechanical and compression pressure connectors are used for making joints in electric conductors. Mechanical connectors obtain the pressure to attach the connector to the electric conductor from an integral screw, cone, or other mechanical parts. A mechanical connector thus applies force and distributes it suitably through the use of bolts or screws and properly designed sections. The bolt diameter and number of bolts are selected to produce the clamping and contact pressures required for the most satisfactory design. The sections are made heavy enough to carry rated current and withstand the mechanical operating conditions. These are frequently not satisfactory with aluminum, since only a portion of the strands are distorted by this connector. Compression connectors are those in which the pressure to attach the connector to the electric conductor is applied externally, changing the size and shape of the connector and conductor. The compression connector is basically a tube with the inside diameter slightly larger than the outer diameter of the conductor. The wall thickness of the tube is designed to carry the current, withstand the installation stresses, and withstand the mechanical stresses resulting from thermal expansion of the conductor. A joint is made by compressing the conductor and tube into another shape by means of a specially designed die and tool. The final shape may be indented, cup, hexagon, circular, or oval. All methods have in common the reduction in cross- sectional area by an amount sufficient to assure intimate and lasting contact between the connector and the conductor. Small connectors can be applied with a small hand tool. Larger connectors are applied with a hydraulic compression tool. A properly crimped joint deforms the conductor strands sufficiently to have good electrical conductivity and mechanical strength, but not so much that the crimping action overcompresses the strands, thus weakening the joint. Mechanical and compression connectors are available as tap connectors. Many connectors have an independent insulating cover. After a connection is made, the cover is assembled over the joint to insulate and, in some cases, to seal against the environment. 12.6.2 Connectors for aluminum Aluminum conductors are different from copper in several ways, and these property differences should be considered in specifying and using connectors for aluminum conductors (see table 12-1). The normal oxide coating on aluminum has a relatively high electrical resistance. Aluminum has a coefficient of thermal expansion greater than copper. The ultimate and the yield strength properties and the resistance to creep of aluminum are different from the corresponding properties of copper. Corrosion is possible under some conditions because aluminum is anodic to other commonly used metals, including copper, when electrolytes even from humid air are present. Mechanical properties and resistance to creep. Creep is commonly referred to as the continued deformation of the material under stress. The effect of excessive creep resulting from the use of an inadequate connector that applies excessive stress could be the relaxation of contact pressure within the connector, and a resulting deterioration and failure of the electric connection. In mechanical connectors for aluminum, as for copper, proper design can limit residual unit bearing loads to reasonable values, with a resulting minimum plastic deformation and creep subsequent to that initially experienced on installation. Connectors for aluminum wire can accommodate a range of conductor sizes, provided that the design takes into account the residual pressure on both minimum and maximum conductors. Oxide film. The surface oxide film on aluminum, though very thin and quite brittle, has a high electrical resistance and, therefore, must be removed or penetrated to ensure a satisfactory electric joint. This film can be removed by abrading with a wire brush, steel wool, emery cloth, or similar abrasive tool or material. A plated surface, whether on the connector or bus, should never be abraded; it can be cleaned with a solvent or other means that will not remove the plating. Some aluminum fittings are factory filled with a connection aid compound, usually containing particles that aid in obtaining low contact resistance. These compounds act to seal connections against oxidation and corrosion by preventing air and moisture from reaching contact surfaces. Connection to the inner strands of a conductor requires deformation of these strands in the presence of the sealing compound to prevent the formation of an oxide film. Thermal expansion. The linear coefficient of thermal expansion of aluminum is greater than that of copper and is important in the design of connectors for aluminum conductors. Unless provided for in the design of the connector, the use of metals with coefficients of expansion less than that of aluminum can result in high stresses in the aluminum during heat cycles, causing additional plastic deformation and significant creep. Stresses can be significant, not only because of the differences of coefficients of expansion, but also because the connector may operate at an appreciably lower temperature than the conductor. This condition will be aggravated by the use of bolts that are of a dissimilar metal or have different thermal expansion characteristics from those of the terminal. Corrosion. Direct corrosion from chemical agents affects aluminum no more severely than it does copper and, in most cases, less. However, since aluminum is more anodic than other common conductor metals, the opportunity exists for galvanic corrosion in the presence of moisture and a more cathodic metal. For this to occur, a wetted path must exist between external surfaces of the two metals in contact to set up an electric cell through the electrolyte (moisture), resulting in erosion of the more anodic of the two, in this instance, the aluminum. Galvanic corrosion can be minimized by the proper use of a joint compound to keep moisture away from the points of contact between dissimilar metals. The use of rela tively large aluminum anodic areas and masses minimizes the effects of galvanic cor rosion. Plated aluminum connectors must be protected by taping or other sealing means. Types of connectors for aluminum conductors. UL has listed connectors approved for use on aluminum that have successfully withstood UL performance tests as specified by ANSI/UL 486B-1990. Both mechanical and compression connectors are available. The most satisfactory connectors are specifically designed for aluminum conductors to prevent any possible troubles from creep, the presence of oxide film, and the differences of coefficients of expansion between aluminum and other metals. These connectors are usually satisfactory for use on copper conductors in noncorrosive locations. The connection of an aluminum connector to a copper or aluminum pad is similar to the connection of bus bars. When both the pad and the connector are plated and the connection is made indoors, few precautions are necessary. The contact surfaces should be clean; if not, a solvent should be used. Abrasive cleaners are undesirable since the plating may be removed. In normal application, steel, aluminum, or copper alloy bolts, nuts, and flat washers may be used. A light film of a joint compound is acceptable, but not mandatory. When either of the contact surfaces is not plated, the bare surface should be cleaned by wire brushing and then coated with a joint compound. Belleville washers are suggested for heavy duty applications where cold flow or creep may occur, or where bare contact surfaces are involved. Flat washers should be used wherever Belleville washers or other load concentrating elements are employed. The flat washer must be located between the aluminum lug, pad, or bolt and the outside edge of the Belleville washer with the neck or crown of the Belleville against the bolting nut to obtain satisfactory operation. In outdoor or corrosive atmosphere, the above applies with the additional requirement that the joint be protected. An unplated aluminum to aluminum connection can be protected by the liberal use of a nonoxide compound. In an aluminum to copper connection, a large aluminum volume compared to the copper is important as well as the placement of the aluminum above the copper. Again, coating with a joint compound is the minimum protection; painting with a zinc chromate primer or thoroughly sealing with a mastic or tape is even more desirable. Plated aluminum should be completely sealed against the elements. Welded aluminum terminals. For aluminum cables 250 kcmil and larger, which carry large currents, excellent terminations can be made by welding special terminals to the cable. This is best done by the inert gas shielded metal arc method. The use of inert gas eliminates the need for any flux to be used in making the weld. The welded terminal is shorter than a compression terminal because the barrel for holding the cable can be very short. It has the advantage of requiring less room in junction or equipment terminal boxes. Another advantage is the reduced resistance of the connection. Each strand of the cable is bonded to the terminal, resulting in a continuous metal path for the current from every strand of the cable to the terminal. Welding of these terminals to the conductors may also be done by using the tungsten electrode type of ac welding equipment. The tungsten arc method is slower but, for small work, gives somewhat better control. The tongues or pads of the welded terminals, such as the large compression connectors, are available with bolt holes to conform to NEMA FB 11-1983 and NEMA PR 4-1983 for terminals to be used on equipment. g) Procedure for Connecting Aluminum Conductors (see figure 12-8) When cutting cable, avoid nicking the strands. Nicking makes the cable subject to easy breakage [see figure 12-8(a)]. Contact surfaces should be cleaned. The abrasion of contact surfaces is helpful even with new surfaces, and is essential with weathered surfaces. Do not abrade plated surfaces [see figure 12-8(b)]. Apply joint compound to the conductor if the connector does not already have it [see figure 12-8(c)].  Figure 12-8Procedures for connecting aluminum conductors Use only connectors specifically tested and approved for use on aluminum conductors. On mechanical connectors, tighten the connector with a screwdriver or wrench to the required torque. Remove excess compound [see figure 12-8(d)]. On compression connectors, crimp the connector using proper tool and die. Remove excess compound [see figure 12-8(e)]. Always use a joint compound compatible with the insulation and as recommended by the manufacturer. The oxide film penetrating or removing properties of some compounds aids in obtaining good initial conductivity. The corrosion inhibiting and sealing properties of some compounds help ensure the maintenance of continued good conductivity and prevention of corrosion. When making an aluminum to copper connection that is exposed to moisture, place the aluminum conductor above the copper. This prevents soluble copper salts from reaching the aluminum conductor, which could result in corrosion. If there is no exposure to moisture, the relative position of the two metals is not important. When using insulated conductors outdoors, extend the conductor insulation or covering as close to the connector as possible to minimize weathering of the joint. Outdoors, whenever possible, joints should be completely protected by tape or other means. When outdoor joints are covered or protected, the protection should completely exclude moisture, as the retention of moisture could lead to severe corrosion. 12.6.3 Connectors for cables of various voltage Standard mechanical or compression connectors are recommended for all primary voltages provided the bus is noninsulated. Welded connectors may also be used for conductors sized in circular mils. Up to 600 V, standard connector designs present no problem for insulated or noninsulated conductors. The standard compression connectors are suitable for use on non- shielded conductors up to 5 kV. Above 5 kV and on shielded 5 kV conductors, stress considerations make it desirable to use tapered end compression connectors or semiconducting tape construction to provide the same effect. 12.6.4 Performance requirements Electric connectors for industrial plants are designed to meet the requirements of the NEC. They are evaluated on the basis of their ability to pass secureness, heating, heat cycling, and pull-out tests as specified in ANSI/UL 486A-1991 and ANSI/UL 486B-1990. These standards were revised to incorporate more stringent requirements for aluminum terminating devices. The reader is cautioned to specify and use only those lugs meeting the requirements of current UL Standards. 12.6.5 Electrical and mechanical operating requirements Electrically, the connectors must carry the current without exceeding the temperature rise of the conductors being joined. Joint resistance that is not appreciably greater than that of an equal length of conductor being joined is recommended to assure continuous and satisfactory operation of the joint. In addition, the connector must be able to withstand momentary overloads or short circuit currents to the same degree as the conductor itself. Mechanically, a connector must be able to withstand the effects of the environment within which it is operating. When installed outdoors, it must withstand temperature extremes, wind, vibration, rain, ice, sleet, gases, chemical attack, etc. When used indoors, any vibration from rotating machinery, corrosion caused by plating or manufacturing processes, elevated temperatures from furnaces, etc., must not materially affect the performance of the joint. 12.7 Terminations 12.7.1 Purpose A termination for an insulated power cable must provide certain basic electrical and mechanical functions. These essential requirements include the following: Electrically connect the insulated cable conductor to electric equipment, bus, or non- insulated conductor. Physically protect and support the end of the cable conductor, insulation, shielding system, and overall jacket, sheath, or armor of the cable. Effectively control electrical stresses to provide both internal and external dielectric strength to meet desired insulation levels for the cable system. The current carrying requirements are the controlling factors in the selection of the proper type and size of the connector or lug to be used. Variations in these components are related to the base material used for the conductor within the cable, the type of termination used, and the requirements of the electrical system. The physical protection offered by the termination will vary considerably, depending on the requirements of the cable system, the environment, and the type of termination used. The termination must provide an insulating cover at the cable end to protect the cable components (conductor, insulation, and shielding system) from damage by any contaminants that may be present, including gases, moisture, and weathering. Shielded medium voltage cables are subject to unusual electrical stresses where the cable shield system is ended just short of the point of termination. The creepage distance that must be provided between the end of the cable shield, which is at ground potential, and the cable conductor, which is at line potential, will vary with the magnitude of the voltage, the type of terminating device used, and, to some degree, the kind of cable used. The net result is the introduction of both radial and longitudinal voltage gradients that impose dielectric stress of varying magnitude at the end of the cable. The termination provides a means of reducing and controlling these stresses within the working limits of the cable insulation and the materials used in the terminating device. 12.7.2 Definitions The definitions for cable terminations are contained in IEEE Std 48-1990. A Class 1 medium voltage cable termination, or more simply, a Class 1 termination, provides the following: Some form of electric stress control for the cable insulation shield termination. Complete external leakage insulation between the medium voltage conductor(s) and ground. A seal to prevent the entrance of the external environment into the cable and to maintain the pressure, if any, within the cable system. This classification encompasses what was formerly referred to as a pothead. A Class 2 termination provides only items a and b: some form of electrical stress control for the cable insulation shield termination, and complete external leakage insulation, but no seal against external elements. Terminations within this classification would be stress cones with rain shields or special outdoor insulation added to give complete leakage insulation, and the newer slip-on terminations for cables having extruded insulation that do not provide a seal as in Class 1. A Class 3 termination provides only item a: some form of electrical stress control for the cable insulation shield termination. This class of termination is used primarily indoors. Typically, this would include hand-wrapped stress cones (tapes or pennants) and the slip-on stress cones. 12.7.3 Cable terminations The requirements imposed by the installation location dictate the termination design class. The least critical is an indoor installation within a building or inside a sealed protective housing. Here the termination is subjected to a minimum exposure to the elements, i.e., sunlight, moisture, and contamination. IEEE Std 48-1990 refers to what is now called a Class 3 termination, as an indoor termination. Outdoor installations expose the termination to a broad range of elements and require that features be included in its construction to withstand this exposure. The present Class 1 termination defined in IEEE Std 48-1990 was previously called an outdoor termination. In some areas, the air can be expected to carry a significant amount of gaseous contaminants and liquid or solid particles that may be conducting, either alone or in the presence of moisture. These environments impose an even greater demand on the termination to protect the cable end, prevent damaging contaminants from entering the cable, and for the termination itself to withstand exposure to the contaminants. The termination may be required to perform its intended function while partially or fully immersed in a liquid or gaseous dielectric. These exposures impose upon the termination the necessity of complete compatibility between the liquids and exposed parts of the termination, including any gasket sealing materials. Cork gaskets have been used in the past, but the newer materials such as tetrafluoroethylene (TFE) and silicone provide superior gasketing characteristics. The gaseous dielectrics may be nitrogen or any of the electronegative gases, such as sulfur hexafluoride, that are used to fill electrical equipment. 12.7.3.1 Nonshielded cable Cables have a copper or aluminum conductor with thermosetting or thermoplastic insulation and no shield. Terminations for these cables generally consist of a lug and may be taped. The lug is fastened to the cable by one of the methods described in 12.6, and tape is applied over the lower portion of the barrel of the lug and down onto the cable insulation. Tapes used for this purpose are selected on the basis of compatibility with the cable insulation and suitability for application in the environmental exposure anticipated. 12.7.3.2 Shielded cable Cables rated over 2000 V have either a copper or aluminum conductor with an extruded solid dielectric insulation, such as ethylene propylene rubber (EPR) or cross-linked polyethylene (XLPE), or a laminated insulating system, such as oil-impregnated paper tapes or varnished cloth tapes. A shielding system must be used on solid dielectric cables rated 5 kV and higher unless the cable is specifically listed or approved for nonshielded use (see 12.2.4.4). When terminating shielded cable, the shielding is terminated far enough back from the conductor to provide the necessary creepage distance between the conductor and the shield. This abrupt ending of the shield introduces longitudinal stress over the surface of the exposed cable insulation. The resultant combination of radial and longitudinal electric stress at the termination of the cable results in maximum stress occurring at this point. However, these stresses can be controlled and reduced to values within the safe working limits of the materials used for the termination. The most common method of reducing these stresses is to gradually increase the total thickness of insulation at the termination by adding, over the insulation, a premolded rubber cone or insulating tapes to form a cone. The cable shielding is carried up the cone surface and terminated at a point approximately 1/8 inch behind the largest diameter of the cone. A typical tape construction is illustrated in figure 12-9. This form is commonly referred to as a stress cone or geometric stress cone. This function can also be accomplished by using a high dielectric constant material, as compared to that of the cable insulation, either in tape form or premolded tube, applied over the insulation in this area. This method results in a low stress profile and is referred to as capacitive stress control. It is advisable to consult individual manufacturers of cable, terminating, and splicing materials for their recommendations on terminating and splicing shielded cables. 12.7.3.3 Termination classes A Class 1 termination is designed to handle the electrical functions as defined in 12.7.2. A Class 1 termination is used in areas that may have exposure to moisture or contaminants, or both. As pointed out in 12.7.3, the least severe requirements are those for a completely weather-protected area within a building or in a sealed protective housing. In this case, a track-resistant insulation, such as a silicone rubber tape or tube, would be used to provide the external leakage insulation function. The track-resistant surface would not necessarily need the skirts (fins or rain shields). The design of the termination to provide stress control and cable conductor seal can be the same for a weather protected, low contamination area as for a high contamination area. When a Class 1 termination is installed outdoors, the design of the X, Y, Z Dielectric stress lines A, B, C, D Equipotential lines Figure 12-9Stress cone termination will vary according to the external leakage insulation function that will be in the form of silicone rubber, EPDM rubber, or porcelain insulation with rain shields. Of these forms, porcelain has the better resistance to long term exposure in highly contaminated areas and to electrical stress with arc tracking. Because of these features, they are usually chosen for coastal areas where the atmosphere is salty. The choice in other weather exposed areas is usually based on such factors as ease of installation, time of installation, overall long-term corrosion-resistance of components, device cost, and past history. Typical Class 1 terminations are shown in figures 12-10 and 12-11. A Class 2 termination is different from a Class 1 termination only in that it does not seal the cable end to prevent entrance of the external environment into the cable or maintain the pres sure, if any, within the cable. Therefore, a Class 2 termination should not be used where  Figure 12-10Typical Class 1 porcelain terminator (for solid dielectric cables) moisture can enter into the cable. For a nonpressurized cable, typical of most industrial power cable systems using solid dielectric insulation, this seal is usually very easy to make. In the case of a poured porcelain terminator (commonly known as a pothead) , the seal is normally built into the device. For a tape or slip-on terminator, the seal against external elements can be obtained by using tape (usually silicone rubber) to seal the conductor between the insulation and connector, assuming that the connector itself has a closed end. The Class 3 termination only provides some form of stress control. Formerly known as an indoor termination, it is recommended for use only in weather protected areas. Before selecting a Class 3 termination, consideration should be given to the fact that, while it is not directly exposed to the elements, there is no guarantee of the complete absence of some moisture or contamination. As a result, the lack of external leakage insulation between the medium voltage conductor(s) and ground (or track resistant material), and the seal to prevent  Figure 12-11Typical Class 1 molded rubber terminators (for solid dielectric cables) the moisture from entering the cable, can result in shortened life of the termination. In general, this practice should be avoided. A typical Class 3 termination is shown in figure 12-12. 12.7.3.4 Other termination design considerations Termination methods and devices are available in ratings of 5 kV and above for either single conductor or three conductor installations and for indoor, outdoor, or liquid-immersed applications. Mounting variations include bracket, plate, flanged, and free hanging types. Both cable construction and the application should be considered in the selection of a termination method or device. Voltage rating, desired basic impulse insulation level (BIt), conductor size, and current requirements are also considerations in the selection of the termination device or method. Cable construction is the controlling factor in the selection of the proper entrance sealing method and the stress-relief materials or filling compound. Application, in turn, is the prime consideration for selecting the termination device or method, mounting requirements, and desired aerial connectors. Cable systems may be  Figure 12-12Typical Class 3 rubber terminator (for solid dielectric cable) categorized into two general groups: nonpressurized and pressurized. Most power cable distribution systems are nonpressurized and utilize solid dielectric insulation. 12.7.3.5 Termination devices and methods The termination hardware used on a pressurized cable system, which can also be used on a nonpressurized system, includes a hermetically sealed feature used to enclose and protect the cable end. A typical design consists of a metallic body with one or more porcelain insulators with fins (also called skirts or rain shields). The body is designed to accept a variety of optional cable entrance fittings, while the porcelain bushings, in turn, are designed to accommodate a number of cable sizes and aerial connections. These parts are assembled in the field onto the prepared cable ends, with stress cones required for shielded cables, and the assembled unit is filled with an insulating compound. Considerable skill is required for proper installation of this Class 1 termination, particularly in filling and cooling out, to avoid shrinkage and formation of voids in the fill material. Similar devices are available that incorporate high dielectric filling compounds, such as oil and thermosetting polyurethane resin, which do not require heating. Advances in terminations for single conductor cables include units designed to reduce the required cable end preparation, installation time, and eliminate the hot-fill-with-compound step. One termination, applicable only to solid dielectric cables, is offered with or without a metal porcelain housing and requires the elastomeric materials to be applied directly to the cable end. Another termination consists of a metal porcelain housing filled with a gelatin-like substance designed to be partially displaced as the termination is installed on the cable. This latter unit may be used on any compatible nonpressurized cable. The advantages of the preassembled terminations include simplified installation procedures, reduced installation time, and consistency in the overall quality and integrity of the installed system. Preassembled Class 1 terminations are available in ratings of 5 kV and above for most applications. The porcelain housings include flanged mounting arrangements for equipment mounting and liquid-immersed applications. Selection of preassembled termination devices is essentially the same as for poured compound devices with the exception that those units using solid elastomeric materials generally must be sized, with close tolerance, to the cable diameters to ensure proper fit. Another category of termination devices incorporates preformed stress cones (figure 12-1 1). The most common preformed stress cone is a two-part elastomeric assembly consisting of a semiconducting lower section formed in the shape of a stress cone and an insulating upper section. With the addition of medium-voltage insulation protection from the stress cone to the termination lug (a track-resistant silicone tape or tube, or silicone insulators or fins for weather-exposed areas) and by sealing the end of the cable, the resultant termination is a Class 2 termination, for use in areas exposed to moisture and contamination, but not required to hold pressure. Taped terminations, although generally more time-consuming to apply, are very versatile. Generally, taped terminations are used at 15 kV and below; however, there have been instances where they were used on cables up to 69 kV. On nonshielded cables, the termination is made with only a lug and a seal, usually tape. Termination of shielded cables requires the use of a stress cone and cover tapes in addition to the lug. The size and location of the stress cone is controlled primarily by the operating voltage and whether the termination is exposed or protected from the weather. A creepage distance of 1 in/kV of nominal system voltage is commonly used for protected areas, and a 23 in distance allowed for exposed areas. Additional creepage distance may be gained by using a nonwetting insulation, fins, skirts, or rain hoods between the stress cone and conductor lug. For weather-exposed areas, this insulation is usually a track-resistant material, such as silicone rubber or porcelain. Insulating tapes for the stress cone are selected to be compatible with the cable insulation, and tinned copper braid and semiconducting tape are used as conducting materials for the cone. A solid copper strap or solder-blocked braid should be used for the ground connection to prevent water wicking along the braid. Some of the newer terminations do not require a stress cone. They utilize a stress-relief or grading tape or tube. The stress-relief or grading tape or tube is then covered with another tape or a heat shrinkable tube for protection against the environment. The exterior tape or tube may also provide a track-resistant surface for greater protection in contaminated atmospheres. 12.7.4 Jacketed and armored cable connectors Outer coverings for these cables may be nonmetallic, such as neoprene, polyethylene, or polyvinyl chloride, or metallic, such as lead, aluminum, or galvanized steel, or both, depending upon the installation environment. The latter two metallic coverings are generally furnished in an aluminum or galvanized steel tape helically applied and interlocked over the cable core or a continuously welded and corrugated aluminum sheath. The terminations available for use with these cables provide a means of securing the outer covering and may include conductor terminations. The techniques for applying them vary with the cable construction, voltage rating, and the requirements for the installation. The outer covering of multiconductor cables must be secured at the point of termination using cable connectors approved both for the cable and the installation conditions. Type MC metal clad cables with a continuously welded and corrugated sheath or an interlocking tape armor require, in addition to cable terminators, an arrangement to secure and ground the armor. Fittings available for this purpose are generally referred to as armored cable connectors. These armored cable connectors provide mechanical termination and electrically ground the armor. This is particularly important on the continuous corrugated aluminum sheath because the sheath is the grounding conductor. In addition, the connector may provide a watertight seal for the cable entrance to a box, compartment, pothead, or other piece of electrical equipment. These connectors are sized to fit the cable armor and are designed for use on the cable alone, with brackets or with locking nuts or adaptors for application to other pieces of equipment. 12.7.5 Separable insulated connectors These are two-part devices used in conjunction with medium-voltage electrical apparatus. A bushing assembly is attached to the medium-voltage apparatus (transformer, switch, fusing device, etc.), and a molded plug-in connector is used to terminate the insulated cable and connect the cable system to the bushing. The dead front feature is obtained by fully shielding the plug-in connector assembly. Two types of separable insulated connectors, for application at 15 kV and 25 kV, are available: load break and nonload break. Both utilize a molded construction design for use on solid dielectric insulated cables (rubber, cross-linked polyethylene, etc.) and are suitable for submersible applications. The connector section of the device has an elbow (900) configuration to facilitate installation, improve separation, and save space. See IEEE Std 386-1985. Electric apparatus may be furnished with only a universal bushing wall for future installation of bushings for either the load break or nonload break dead front assemblies. Shielded elbow connectors may be furnished with a voltage detection tap to provide a means of determining whether or not the circuit is energized. 12.7.6 Performance requirements Design test criteria have been established for terminations in IEEE Std 48-1990, which specifies the short-time ac 60 Hz and impulse-withstand requirements. Also listed in this design standard are maximum dc field proof test voltages. Individual terminations may safely withstand higher test voltages, and the manufacturer should be contacted for such information. All devices employed to terminate insulated power cables should meet these basic requirements. Additional performance requirements may include thermal load cycle capabilities of the current-carrying components, the environmental performance of completed units, and the long-term overvoltage-withstand capabilities of the device. 12.8 Splicing devices and techniques Splicing devices are subjected to a somewhat different set of voltage gradients and dielectric stress from that of a cable termination. In a splice, as in the cable itself, the greatest stresses are around the conductor and connector area and at the end of the shield. Splicing design must recognize this fundamental consideration and provide the means to control these stresses to values within the working limits of the materials used to make up the splice. In addition, on shielded cables, the splice is in the direct line of the cable system and must be capable of handling any ground currents or fault currents that may pass through the cable shielding. The connectors used to join the cable conductors together must be electrically capable of carrying the full-rated load, emergency overload, and fault currents without overheating, as well as being mechanically strong enough to prevent accidental conductor pullout or separation. Finally, the splice housing or protective cover must provide adequate protection to the splice, giving full consideration to the nature of the application and its environmental exposure. a) 600 V and below. An insulating tape is applied over the conductor connection to electrically and physically seal the joint. The same taping technique is employed in the higher voltages, but with more refinement to cable end preparation and tape applications. Insulated connectors are used where several relatively large cables must be joined together. These terminators, called moles or crabs, are, fundamentally, insulated buses with a provision for making a number of tap connections that can be very easily taped or covered with an insulating sleeve. Connectors of this type enable a completely insulated multiple connection to be made without the skilled labor normally required for careful crotch taping or the expense of special junction boxes. One widely used connector is a preinsulated multiple joint in which the cable connections are made mechanically by compression cones and clamping nuts. Another type is a more compact preinsulated multiple joint in which the cable connections are made by standard compression tooling that indents the conductor to the tubular cable sockets. Also available are tap connectors that accommodate a range of conductor sizes and have an independent insulating cover. After the connection is made, the cover is snapped closed to insulate the joint. Insulated connectors lend themselves particularly well to underground services and industrial wiring where a large number of multiple connections must be made. b) Over 600 V. Splicing of nonshielded cables up to 8 kV consists of assembling a connector, usually soldered or pressed onto the cable conductors, and applying insulating tapes to build up the insulation wall to a thickness of 1.5-2 times that of the original insulation on the cable. Care must be exercised in applying the connector and insulating tapes to the cables; but it is not as critical with nonshielded cables as with shielded cables. Aluminum conductor cables require a moistureproof joint to prevent entry of moisture into the stranding of the aluminum conductors. Splices on solid dielectric cables are made with uncured tapes, that will fuse together after application and provide a waterproof assembly. It is necessary, however, to use a moistureproof adhesive between the cable insulation and the first layer of insulating tapes. Additional protection may be obtained through the use of a moistureproof cover over the insulated splice. This cover may consist of additional moistureproof tapes and paint or a sealed weatherproof housing of some form. 12.8.1 Taped splices Taped splices (see figure 12-13) for shielded cables have been used quite successfully for many years. Basic considerations are essentially the same as for nonshielded cables. Insulating tapes are selected not only on the basis of dielectric properties but also for compatibility with the cable insulation. The characteristics of the insulating tapes must also be suitable for the application of the splice. This latter consideration should include such details as providing a moisture seal for splices subjected to water immersion or direct burial, thermal stability of tapes for splices subjected to elevated ambient and operating temperatures, and ease of handling for applications of tapes on wye or tee splices. Connector surfaces should be smooth and free from any sharp protrusions or edges. The connector ends are tapered, and indentations or distortion caused by pressing tools are filled and shaped to provide a round, smooth surface. Semiconducting tapes are recommended for covering the connector and the exposed conductor stranding to provide a uniform surface over which insulating tapes can be applied. Cables with a solid dielectric insulation are tapered, and those with a tape insulation are stepped to provide a gradual transition between the conductor/connector diameter and the cable insulation diameter prior to application of the insulating tapes. This is done to control the voltage gradients and resultant voltage stress to values within the working limits of the insulating materials. The splice should not be overinsulated to provide additional protection since this could restrict heat dissipation at the splice area and risk splice failure. A tinned or coated copper braid is used to continue the shielding function over the splice area. Grounding straps are applied to at least one end of the splice for grounding purposes, and a heavy braid jumper is applied across the splice to carry available ground fault current. Refer to 12.9.1 for single-point grounding to reduce sheath losses. Final cover tapes or weather barriers are applied over the splice to seal it against moisture entry. A splice on a cable with a lead sheath is generally housed in a lead sleeve, that is solder wiped to the lead cable sheath at each end of the splice. These lead sleeves are filled with compound in much the same way as potheads. Hand-taped splices may be made between lengths of dissimilar cables if proper precautions are taken to ensure the integrity of the insulating system of each cable and the tapes used are compatible with both cables. One example of this would be a splice between a rubber insulated cable and an oil-impregnated paper insulated cable. Such a splice must have an oil barrier to prevent the oil impregnate in the paper cable from coming in contact with the insulation on the rubber cable. In addition, the assembled splice should be made completely moistureproof. This requirement is usually accomplished by housing the splice in a lead sleeve with wiped joints at both ends. A close-fitting lead nipple is placed on the rubber cable and sealed to the jacket of the cable with tape or epoxy. The solder wipe is made to this lead sleeve. Three-way wye and tee splices and the several other special hand-taped splices that can be made all require special design considerations. In addition, a high degree of skill on the part of the installer is a prime requirement for proper installation and service reliability. 12.8.2 Preassembled splices Similar to the preassembled terminators, there are several variations of factory-made splices. The most basic is an elastomeric unit consisting of a molded housing sized to fit the cables involved, a connector for joining the conductors, and tape seals for sealing the ends of the molded housing to the cable jacket. Other versions of elastomeric units include an overall protective metallic housing that completely encloses the splice. These preassembled elastomeric splices are available in two and three way tees, and multiple configurations for applications up to 35 kV. They can be used on most cables having an extruded solid dielectric insulation. The preassembled splice provides a moistureproof seal to the cable jacket and is suitable for submersible, direct burial, and other applications where the splice housing must provide protection for the splice to the same degree that the cable jacket provides protection to the cable insulation and shielding system. An advantage of these preassembled splices is the reduction in time required to complete the splice after cable end preparation. However, the solid elastomeric materials used for the splice are required to be sized, with close tolerance, to the cable diameters to ensure a proper fit. 12.9 Grounding of cable systems For safety and reliable operation, the shields and metallic sheaths of power cables must be grounded. Without grounding, shields would operate at a potential considerably above ground. Thus, they would be hazardous to touch and would cause rapid degradation of the jacket or other material intervening between shield and ground. This is caused by the capacitive charging current of the cable insulation, that is on the order of 1 mA/ft of conductor length. This current normally flows, at power frequency, between the conductor and the earth electrode of the cable, normally the shield. In addition, the shield or metallic sheath provides a fault return path in the event of insulation failure, permitting rapid operation of the protection devices. The grounding conductor and its attachment to the shield or metallic sheath, normally at a termination or splice, should have an ampacity no less than that of the shield. In the case of a lead sheath, the ampacity of the grounding conductor should be adequate to carry the available fault current without overheating, until it is interrupted. Attachment to the shield or sheath is frequently done with solder, which has a low melting point; thus an adequate area of attachment is required. There is much disagreement as to whether the cable shield should be grounded at both ends or at only one end. If grounded at only one end, any possible fault current must traverse the length from the fault to the grounded end, imposing high current on the usually very light shield conductor. Such a current could readily damage or destroy the shield and require replacement of the entire cable rather than only the faulted section. With both ends grounded, the fault current would divide and flow to both ends, reducing the duty on the shield, with consequently less chance of damage. There are modifications to both systems. In one, single- ended grounding may be attained by insulating the shields at each splice or sectionalizing point and grounding only the source end of each section. This limits possible shield damage to only the faulted section. Multiple grounding, rather than just grounding at both ends, is simply the grounding of the cable shield or sheath at all access points, such as manholes or pull boxes. This also limits possible shield damage to only the faulted section. 12.9.1 Sheath losses Currents are induced in the multigrounded shields and sheaths of cables by the current flowing in the power conductor. These currents increase with the separation of the power conductors and increase with decreasing shield or sheath resistance. This sheath current is negligible with three conductor cables, but with single conductor cables separated in direct burial or separate ducts, it can be appreciable. For example, with three single-conductor 500 kcmil cables laid parallel on 8 in centers with twenty spiral No. 16 AWG copper shield wires, the ampacity is reduced approximately 20% by this shield current. With single-conductor, lead- sheathed cables in separate ducts, this current is important enough that single-end grounding is mandatory. As an alternate, the shields are insulated at each splice (at approximately 500 ft intervals) and crossbonded to provide sheath transposition. This neutralizes the sheath currents, but still provides double-ended grounding. Of course, these sheaths and the bonding jumpers must be insulated; their voltage differential from ground may be in the 3050 V range. For details on calculating sheath losses in cable systems, consult the National Electrical Safety Code (NESC) (Accredited Standard Committee C2-1993). Difficulties may arise from current attempting to flow via the cable shield, unrelated to cable- insulation failures. To prevent this, all points served by a multiple grounded shielded cable need to be interconnected with an ample grounding system. The insulation between shield sections at splices of single end grounded shield systems should have sufficient dielectric strength to withstand possible abnormal voltages as well. This system requires interconnecting grounding conductors of suitably low impedance that lightning, fault, and stray currents will follow this path rather than the cable shield. Cable shield ground connections should be made to this system, which should also be connected to the grounded element of the source supplying the energy to the cable. Duct runs, or direct burial routes, generally include a heavy grounding conductor to ensure such interconnection. For further details, refer to Chapter 7, as well as to IEEE Std 142-1991 and the NESC. 12.10 Protection from transient overvoltage Cables rated up to 35 kV that are used in power distribution systems have insulation strengths well above that of other electrical equipment of similar voltage ratings. This is to compensate for installation handling and possibly a deterioration rate greater than for insulation that is exposed to less severe ambient conditions. This high insulation strength may or may not exist in splices or terminations, depending on their design and construction. Except for deteriorated points in the cable itself, the splices or terminations are most affected by overvoltages of lightning and switching transients. The terminations of cable systems not provided with surge protection may flashover due to switching transients. In this event, the cable would be subjected to possible wave reflections of even higher levels, possibly damaging the cable insulation; however, this is a remote possibility in medium-voltage cables. Like other electric equipment, the means employed for protection from these overvoltages is usually surge arresters. These may be for protection of associated equipment as well as the cable. Distribution or intermediate class arresters are used, applied at the junctions of open wire lines and cables, and at terminals where switches may be open. Surge arresters are not required at intermediate positions along the cable run in contrast to open wire lines. It is recommended that surge arresters be connected between the conductor and the cable shielding system with short leads to maximize the effectiveness of the arrester. Similarly recommended is the direct connection of the shields and arrester ground wires to a substantial grounding system to prevent surge current propagation through the shield. Fully insulated aerial cables that are messenger supported and spacer cables are subject to direct lightning strokes, and a number of such cases are on record. The incidence rate is, however, rather low, and, in most cases, no protection is provided. Where, for reliability, such incidents must be guarded against, a grounded shield wire, similar to that used for bare aerial circuits, should be installed on the poles a few feet above the cable. Grounding conductors down the pole need to be carried past the cable messenger with a lateral offset of approximately 18 in to guard against side flashes from the direct strokes. Metal bayonets, when used to support the grounded shielding wire, should also be kept no less than 18 in clear of the cables or messengers. 12.11 Testing 12.11.1 Application and utility Testing, particularly of elastomeric and plastic (solid) insulations, is a useful method of checking the ability of a cable to withstand service conditions for a reasonable future period. Failure to pass the test will either cause breakdown of the cable during test or otherwise indicate the need for its immediate replacement. Whether or not to routinely test cables is a decision each user has to make. The following factors should be taken into consideration. If there is no alternate source for the load supplied, testing should be done when the load equipment is not in operation. The costs of possible service outages due to cable failures should be weighed against the cost of testing. With solid dielectric insulation, failures of cables in service may be reduced approximately 90% by dc maintenance testing. Personnel with adequate technical capability should be available to do the testing, make observations, and evaluate the results. The procedures discussed in this chapter are recommended practices, and many variations are possible. At the same time, variations made without a sound technical basis can negate the usefulness of the test or even damage equipment. With solid dielectric cable (elastomeric and plastic), the principal failure mechanism results from progressive degradation due to ac corona cutting during service at the locations of manufacturing defects, installation damage, or accessory workmanship shortcomings. Initial tests reveal only gross damage, improper splicing or terminating, or cable imperfections. Subsequent use on ac usually causes progressive enlargement of such defects proportional to their severity. Oil-impregnated paper (laminated) cable with a lead sheath (PILC) usually fails from water entrance at a perforation in the sheath, generally within 3 to 6 months after the perforation occurs. Periodic testing, unless very frequent, is therefore likely to miss many of these cases, making this testing method less effective with PILC cable. Testing is not useful in detecting possible failure from moisture-induced tracking across termination surfaces, since this develops principally during periods of precipitation, condensation, or leakage failure of the enclosure or housing. However, terminals should be examined regularly for signs of tracking, and the condition corrected whenever detected. 12.11.2 Alternating current versus direct current Cable insulation can, without damage, sustain application of dc potential equal to the system basic impulse insulation level (BIL) for very long periods. In contrast, most cable insulations will sustain degradation from ac overpotential, proportional to the overvoltage, time of exposure, and the frequency of the applications. Therefore, it is desirable to utilize dc for any testing that will be repetitive. While the manufacturers use ac for the original factory test, it is almost universal practice to employ dc for any subsequent testing. All discussion of field testing hereafter applies to dc high voltage testing. 12.11.3 Factory tests All cable is tested by the manufacturer before shipment, normally with ac voltage for a 5 min period. Nonshielded cable is immersed in water (ground) for this test; shielded cable is tested using the shield as the ground return. Test voltages are specified by the manufacturer, by the applicable UL or ICEA specification, or by other specifications such as those published by the Association of Edison Illuminating Companies (AEIC); refer to AEIC CS5-1987 and AEIC CS6-1987. In addition, a test may be made using dc voltage of two to three times the rms value used in the ac test. On cables rated over 2 kV, corona tests may also be made. 12.11.4 Field tests As well as having no deteriorating effect on good insulation, dc high voltage is the most convenient to use for field testing since the test power sources or test sets are relatively light and portable. However, it should be recognized that correlation between dc test results and cable life expectancy has never been established. The primary benefit of dc high voltage testing is to detect conducting particles left on the creepage surface during splicing or termination. Voltages for such testing should not be so high as to damage sound cable or component insulation but should be high enough to indicate incipient failure of unsound insulation that may fail in service before the next scheduled test. Test voltages and intervals require coordination to attain suitable performance. One large industrial company with more than 25 years of cable testing experience has reached over 90% reduction of cable system service failures through the use of voltages specified by ICEA. These test voltages are applied at installation, after approximately 3 years of service, and every 5 to 6 years thereafter. The majority of test failures occur at the first two tests; test (or service) failures after 8 years of satisfactory service are less frequent. The importance of uninterrupted service should also influence the test frequency for specific cables. Tables 12-8 and 12-9 specify cable field test voltages. The AEIC has specified test values for 1968 (see AEIC CS5-1987 and AEIC CS6-1987) and newer cables at approximately 20% higher than the ICEA values. IEEE Std 400-1980 specifies much higher voltages than either the ICEA or the AEIC. These much more severe test voltages, as shown in table 12-10, are intended to reduce cable failures during operation by overstressing the cables during shutdown testing and causing weak Table 12-8ICEA specified dc cable test voltages (kV), pre-1968 cable Maintenance test rated cable voltageInsulation typeGrounding5 kV15 kV25 kV35 kVElastomeric:Grounded2747butyl, oil base, EPRUngrounded67Polyethylene, including cross-linked polyethyleneGrounded Ungrounded22 40 5267 88  Table 12-9ICEA specified dc cable test voltages (kV), 1968 and later cable* Insulation levelRated cable voltage5 kV15 kV25 kV35 kVInsulation type(%)12121212Elastomeric:100251955418060butyl and oil base13325196549Elastomeric:10025195541806010075EPR1332519654910075Polyethylene, including cross-linked polyethylene100 13325 2519 1955 6541 4980 10060 75100 75  NOTEColumns 1: Installation tests, made after installation, before service; columns 2: maintenance tests, made after cable has been in service. *These test values are lower than for pre-1968 cables because the insulation is thinner. Hence the ac test voltage is lower. The dc test voltage is specified as three times the ac test voltage, so it is also lower than for older cables. cables to fail at that time. These test voltages should not be used without the concurrence of the cable manufacturer, otherwise the cable warranty will be voided. Cables to be tested must have their ends free of equipment and clear from ground. All conductors not under test must be grounded. Since equipment to which cable is customarily connected may not withstand the test voltages allowable for cable, either the cable must be disconnected from this equipment, or the test voltage should be limited to levels that the Table 12-10IEEE Std 400-1980 specified dc cable test voltages (kV), installation and maintenance L-L system voltage (kV)BIL (kV)Test voltage (kV)100% insulation level133% insulation level2.560405057550658.79565851511075100231501051402817012034.5200140 NOTEThese test voltages should not be used without the cable manufacturers' concurrence as the cable warranty will be voided. equipment can tolerate. The latter constitutes a relatively mild test on the cable condition, and the predominant leakage current measured is likely to be that of the attached equipment. Essentially, this tests the equipment, not the cable. It should also be recognized that some pre- assembled or premolded cable accessories may have a lower BIt than the cable itself, and this must be considered when establishing the test criteria. In field testing, in contrast to the "go/no-go" nature of factory testing, the leakage current of the cable system must be closely watched and recorded for signs of approaching failure. The test voltage may be raised continuously and slowly from zero to the maximum value, or it may be raised in steps, pausing for 1 min or more at each step. Potential differences between steps are on the order of the ac rms rated voltage of the cable. As the voltage is raised, current will flow at a relatively high rate to charge the capacitance and, to a much lesser extent, to supply the dielectric absorption characteristics of the cable as well as to supply the leakage current. The capacitance charging current subsides within a second or so; the absorption current subsides much more slowly and will continue to decrease for 10 min or more, ultimately leaving only the leakage current flowing. At each step, and for the 515 min duration of the maximum voltage, the current meter (normally a microammeter) is closely watched. Except when the voltage is first increased at each step, if the current starts to increase, slowly at first, then more rapidly, the last remnants of insulation at a weak point are failing, and total failure of the cable will occur shortly thereafter unless the voltage is reduced. This is characteristic of approximately 80% of all elastomeric insulation test failures. In contrast to this avalanche current increase to failure, sudden failure (flashover) can occur if the insulation is already completely or nearly punctured. In the latter case, voltage increases until it reaches the sparkover potential of the air gap length; then flashover occurs. Polyethylene cables exhibit this characteristic for all failure modes. Conducting leakage paths, such as at terminations or through the body of the insulation, exhibit a constant leakage resistance independent of time or voltage. One advantage of step testing is that a 1 min absorption stabilized current may be read at the end of each voltage step. The calculated resistance of these steps may be compared as the test progresses to the next voltage step. At any step where the calculated leakage resistance decreases markedly (approximately 50% of that of the next lower voltage level), the cable could be near failure and the test should be discontinued short of failure as it may be desirable to retain the cable in serviceable condition until a replacement cable is available. On any test in which the cable will not withstand the prescribed test voltage for the full test period (usually 5 min) without current increase, the cable is considered to have failed the test and is subject to replacement as soon as possible. The polarization index is the ratio of the current after 1 min to the current after 5 min of maximum test voltage and, on good cable, will be between 1.25 and 2. Anything less than 1 should be considered a failure and, between 1 and 1.25, only a marginal pass. After completion of the 5 min maximum test voltage step, the supply voltage control dial should be returned to zero and the charge in the cable allowed to drain off through the leakage of the test set and voltmeter circuits. If this requires too long a time, a bleeder resistor of 1 M per 10 kV of test potential can be added to the drainage path, discharging the circuit in a few seconds. After the remaining potential drops below 10% of the original value, the cable conductor may be solidly grounded. All conductors should be grounded when not on test, during the testing of other conductors, and for at least 30 min after the removal of the dc test potential. They may be touched only while the ground is connected to them; otherwise, the release of absorption current by the dielectric may again raise their potential to a dangerous level. 12.11.5 Procedure Load is removed from the cables either by diverting the load to an alternate supply or by shutdown of the load served. The cables are de-energized by switching, tested to ensure voltage removal, grounded, and then disconnected from the attached switching equipment. (In case they are left connected, lower test potentials are required.) Surge arresters, potential transformers, and capacitors should also be disconnected. All conductors and shields should be grounded. The test set is checked for operation and, after its power has been turned off, the test lead is attached to the conductor to be tested. At this time and not before, the ground should be removed from that conductor, and the bag or jar (see 12.11.6) applied over all of the terminals by covering all noninsulated parts at both ends of the run. The test voltage is then applied slowly, either continuously or in steps as outlined in 12.11.4. Upon completion of the maximum test voltage duration, the charge is drained off, the conductor grounded, and the test lead removed for connection to the next conductor. This procedure is repeated for each conductor to be tested. Grounds should be left on each tested conductor for no less than 30 min. 12.11.6 DC corona and its suppression Starting at approximately 1015 kV and increasing at a high power of the incremental voltage, the air surrounding all bare conductor portions of the cable circuit becomes ionized from the test potential on the conductor and draws current from the conductor. This ionizing current indication is not separable from that of the normal leakage current and reduces the apparent leakage resistance value of the cable. Wind and other air currents tend to blow the ionized air away from the terminals, dissipating the space charge and allowing ionization of the new air, thus increasing what is known as the direct corona current. Enclosing the bare portions of both end terminations in plastic bags, or in jars of plastic or glass, prevents the escape of this ionized air, thus it becomes a captive space charge. Once formed, it requires no further current, so the direct corona current disappears. Testing up to approximately 100 kV is possible with this treatment. Above 100 kV, larger bags or a small bag inside a larger one are required. In order to be effective, the bags must be blown up so that no part of the bag touches the conductor. An alternate method to minimize corona is to completely tape all bare conductor surfaces with standard electrical insulating tape. This method is superior to the bag method for corona suppression, but it requires more time to adequately tape all the exposed ends. 12.11.7 Line voltage fluctuations The very large capacitance of the cable circuit makes the microammeter extremely sensitive to even minor variations in the 120 V, 60 Hz supply to the test set. Normally, it is possible to read only average current values or the near steady current values. A low harmonic content, constant-voltage transformer improves this condition moderately. Complete isolation and stability are attainable only by use of a storage battery and 120 V, 60 Hz inverter to supply the test set. 12.11.8 Resistance evaluation Medium-voltage cable exhibits extremely high insulation resistance, frequently many thousands of megohms. While insulation resistance alone is not a primary indication of the condition of the cable insulation, the comparison of the insulation resistances of the three-phase conductors is useful. On circuits less than 1000 ft long, a ratio in excess of 5:1 between any two conductors is indicative of some questionable condition. On longer circuits, a ratio of 3:1 should be regarded as a maximum. Comparison of insulation-resistance values with previous tests may be informative; but insulation resistance varies inversely with temperature, with winter insulation resistance measurements being much higher than those obtained under summer conditions. An abnormally low insulation-resistance is frequently indicative of a faulty splice, termination, or a weak spot in the insulation. Test voltages greater than standard values have been found practical in locating a weak spot by causing a test failure where the standard voltage would not cause breakdown. Fault location methods may also be used to locate the failure. 12.11.9 Megohmmeter test Since the insulation resistance of a sound medium-voltage cable circuit is generally in the order of thousands to hundreds of thousands of megohms, a megohmmeter test will reveal only grossly deteriorated insulation conditions of medium voltage cable. For low-voltage cable, however, the megohmmeter tester is quite useful and is probably the only practical test. Sound 600 V cable insulation will normally withstand 20 000 V or higher dc. Thus, a 1000 V or 2500 V megohmmeter is preferable to the lower 500 V testers for such cable testing. For low-voltage cables, temperature-corrected comparisons of insulation resistances with other phases of the same circuit, with previous readings on the same conductor, and with other similar circuits are useful criteria for adequacy. Continued reduction in the insulation resistance of a cable over a period of several tests is indicative of degrading insulation; however, a megohmmeter will rarely initiate final breakdown of such insulation. 12.12 Locating cable faults In electric power distribution systems, a wide variety of cable faults can occur. The problem may be in a communication circuit or in a power circuit, either in the low- or medium-voltage class. Circuit interruption may have resulted, or operation may continue with some objectionable characteristic. Regardless of the class of equipment involved or the type of fault, the one common problem is to determine the location of the fault so that repairs can be made. The vast majority of cable faults encountered in an electric power distribution system occur between conductor and ground. Most fault-locating techniques are made with the circuit de- energized. In ungrounded or high-resistance grounded, low-voltage systems, however, the occurrence of a single line-to-ground fault will not result in automatic circuit interruption; therefore, the process of locating the fault may be carried out by special procedures with the circuit energized. 12.12.1 Influence of ground fault resistance Once a line-to-ground fault has occurred, the resistance of the fault path can range from almost zero up to millions of ohms. The fault resistance has a bearing on the method used to locate the failure. In general, a low-resistance fault can be located more readily than one of high resistance. In some cases, the fault resistance can be reduced by the application of voltage sufficiently high to cause the fault to break down as the excessive current causes the insulation to carbonize. The equipment required to do this is quite large and expensive, and its success is dependent, to a large degree, on the insulation involved. Large users indicate that this method is useful with paper and elastomeric cables but generally of little use with thermoplastic insulation. The fault resistance that exists after the occurrence of the original fault depends on the cable insulation and construction, the location of the fault, and the cause of the failure. A fault that is immersed in water will generally exhibit a variable fault resistance and will not consistently arc over at a constant voltage. Damp faults behave in a similar manner until the moisture has been vaporized. In contrast, a dry fault will normally be much more stable and, consequently, can be more readily located. For failures that have occurred in service, the method of system grounding and available fault current, as well as the speed of relay protection, will be influencing factors. Because of the greater carbonization and conductor vaporization, a fault resulting from an in-service failure can generally be expected to be of a lower resistance than one resulting from overpotential testing. 12.12.2 Equipment and methods A wide variety of commercially available equipment and a number of different approaches can be used to locate cable faults. The safety considerations outlined in 12.11 should be observed. The method used to locate a cable fault depends on the following: Nature of fault Type and voltage rating of cable Value of rapid location of faults Frequency of faults Experience and capability of personnel 12.12.2.1 Physical evidence of the fault Observation of a flash, a sound, or smoke accompanying the discharge of current through the faulted insulation will usually locate a fault. This is more probable with an overhead circuit than with underground construction. The discharge may be from the original fault or may be intentionally caused by the application of test voltages. The burned or disrupted appearance of the cable will also serve to indicate the faulted section. 12.12.2.2 Megohmmeter instrument test When the fault resistance is sufficiently low that it can be detected with a megohmmeter, the cable can be sectionalized and each section tested to determine which contains the fault. This procedure may require that the cable be opened in a number of locations before the fault is isolated to one replaceable section. This could, therefore, involve considerable time and expense, and might result in additional splices. Since splices are often the weakest part of a cable circuit, this method of fault locating may introduce additional failures at a subsequent time. 12.12.2.3 Conductor-resistance measurement This method consists of measuring the resistance of the conductor from the test location to the point of fault by using either the Varley loop or the Murray loop test. Once the resistance of the conductor to the point of fault has been measured, it can be translated into distance by using handbook values of resistance per unit length for the size and conductor material involved, correcting for temperature as required. Both of these methods give good results that are independent of fault resistance, provided the fault resistance is low enough that sufficient current for readable galvanometer deflection can be produced with the available test voltage. Normally a low-voltage bridge is used for this resistance measurement. For distribution systems using cables insulated with organic materials, relatively low-resistance faults are normally encountered. The conductor-resistance measurement method has its major application on such systems. Loop tests on large conductor sizes may not be sensitive enough to narrow down the location of the fault. High-voltage bridges are available for higher resistance faults but have the disadvantage of increased cost and size as well as requiring a high voltage dc power supply. High-voltage bridges are generally capable of locating faults with a resistance to ground of up to 1 or 2 M, while a low-voltage bridge is limited to the application where the resistance is several kilohms or less. 12.12.2.4 Capacitor discharge This method consists of applying a high-voltage and high-current impulse to the faulted cable. A high-voltage capacitor is charged by a relatively low-current capacity source such as that used for high-potential testing. The capacitor is then discharged across an air gap or by a timed closing contact into the cable. The repeated discharging of the capacitor provides a periodic pulsing of the faulted cable. The maximum impulse voltage should not exceed 50% of the allowable dc cable test voltage since voltage doubling can occur at open circuit ends. Where the cable is accessible, or the fault is located at an accessible position, the fault may be located simply by sound. Where the cable is not accessible, such as in duct or directly buried, the discharge at the fault may not be audible. In such cases, detectors are available to trace the signal to the location of the fault. The detector generally consists of a magnetic pickup coil, an amplifier, and a meter to display the relative magnitude and direction of the signal. The direction indication changes as the detector passes beyond the fault. Acoustic detectors are also employed, particularly in situations where no appreciable magnetic field external to the cable is generated by the tracing signal. In applications where relatively high-resistance faults are anticipated, such as with solid dielectric cables or through compound in splices and terminations, the impulse method is the most practical method presently available and is the one most commonly used. 12.12.2.5 Tone signal A tone signal may be used on energized circuits. A fixed-frequency signal, generally in the audio frequency range, is imposed on the faulted cable. The cable route is then traced by means of a detector, which consists of a pickup coil, receiver, and a head set or visual display, to the point where the signal leaves the conductor and enters the ground return path. This class of equipment has its primary application in the low-voltage field and is frequently used for fault location on energized ungrounded circuits. On systems over 600 V, the use of a tone signal for fault location is generally unsatisfactory because of the relatively large capacitance of the cable circuit. 12.12.2.6 Radar system A short-duration, low-energy pulse is imposed on the faulted cable and the time required for propagation to and return from the point of fault is monitored on an oscilloscope. The time is then translated into distance to locate the fault. Although this equipment has been available for a number of years, its major application in the power field has been on long-distance, high-voltage lines. In older test equipment, the propagation time is such that it cannot be displayed with good resolution for relatively short cables. However, recent equipment advances have largely overcome this deficiency. The major limitation to this method is its inability to adequately determine the difference between faults and splices on multitapped circuits. An important feature of this method is that it will locate an open in an otherwise unfaulted circuit. 12.12.3 Selection The methods already listed represent some of the methods available to locate cable faults. They range from very simple to relatively complex. Some require no equipment, others require equipment that is inexpensive and can be used for other purposes, while still others require special equipment. As the complexity of the means used to locate a fault increases, so does the cost of the equipment as well as the training and experience required of those who are to use it. In determining which approach is most practical for any particular facility, the size of the installation and the amount of circuit redundancy that it contains must be considered. The importance of minimizing the outage time of any particular circuit must be evaluated. The cable installation and maintenance practices and the number and time of anticipated faults will determine the expenditure for test equipment that can be justified. Equipment that requires considerable experience and operator interpretation for accurate results may be satisfactory for an application with frequent cable faults but ineffective where the number of faults is so small that adequate experience cannot be obtained. Because of these factors, many companies employ firms that offer the service of cable-fault locating. Such firms are usually located in large cities and cover a large area with mobile test equipment. While the capacitor discharge method is most widely used, no single method of cable-fault location can be considered to be most suitable for all applications. The final decision on which method or methods to use depends upon evaluation of the advantages and disadvantages of each in relation to the particular circumstances of the facility in question. As a last resort, opening splices in manholes and testing the cable between manholes can be used to locate the faulted cable. 12.13 Cable specification Once the correct cable has been determined, it can be described in a cable specification. Cable specifications generally start with the conductor and progress radially through the insulation and coverings. The following is a check list that can be used in preparing a cable specification: Number of conductors in cable, and phase identification required Conductor size (AWG, kcmil) and material Insulation (rubber, polyvinyl chloride, XLPE, EPR, etc.) Voltage rating, and whether system requires 100%, 133%, or 173% insulation level Shielding system, required on cable systems rated 8 kV and above and may be required on systems rated 20018000 V Outer finishes Installation approvals required (for use in cable tray, direct burial, messenger- supported, wet location, exposure to sunlight or oil, etc.) Applicable UL listing Test voltage and partial-discharge voltage Ground-fault-current value and time duration Cable accessories, if any, to be supplied by cable manufacturer An alternate method of specifying cable is to furnish the ampacity of the circuit (amperes), the voltage (phase-to-phase, phase-to-ground, grounded, or ungrounded), and the frequency, along with any other pertinent system data. Also required is the installation method and the installation conditions (ambient temperature, load factor, etc.). For either method, the total number of linear feet of conductors required, the quantity desired shipped in one length, any requirement for pulling eyes, and whether it is desired to have several single-conductor cables paralleled on a reel should also be given. Raceways Cable trays Protective Devices Red 5.1-5.9 Purpose Analysis of system behavior and protection needs Protective devices and their applications Performance limitations Principles of protective relay application Protection requirements Use and interpretation of time-current coordination curves Specific examples, applying the fundementals Acceptance testing (commissioning, maintenance, and field testing Fuses General discussion A low-voltage fuse is a device that protects a circuit by opening its current-responsive element when an overcurrent passes through it. A fuse, as defined in The Authoritative Dictionary of IEEE Standards, Seventh Edition, is an overcurrent protective device with a circuit-opening fusible part that is heated and severed by the passage of the overcurrent through it. NOTEA fuse comprises all the parts that form a unit capable of performing the prescribed functions. It may or may not be the complete device necessary to connect it into an electric circuit. A fuse has these functional characteristics: It combines both the sensing and interrupting elements in one self-contained device. It is direct acting in that it responds to a combination of magnitude and duration of circuit current flowing through it. It normally does not include any provision for manually making and breaking the connection to an energized circuit, but requires separate devices (e.g., a disconnect switch) to perform this function. It is a single-phase device. Only the fuse in the phase or phases subjected to overcurrent responds to de-energize the affected phase or phases of the circuit or equipment that is faulty. After having interrupted an overcurrent, it is renewed by the replacement of its current-responsive element before restoration of service. Definitions The following terms may be found in other industry publications on fuses, but are included in this recommended practice for convenience. ampere rating: The root-mean-square (rms) or dc current that the fuse carries continuously without deterioration and without exceeding temperature rise limits specified for that fuse. arcing time: The time elapsing from the melting of the current-responsive element (e.g., the link) to the final interruption of the circuit. This time is dependent upon such factors as voltage and reactance of the circuit. (See Figure REF RTF31313036363a204669675469 \hError! Reference source not found..) bridge: The narrowed portion of a fuse link that is expected to melt first. One link may have two or more bridges in parallel and in series as well. The shape and size of the bridge is a factor in determining the fuse characteristics under overload and fault current conditions. current limiter: A device intended to function only on fault currents and not on lesser overcurrents regardless of time. Such a device is often used in series with a circuit breaker, which protects against overloads and low-level short circuits. However, cable limiters are types of current limiters that are used to provide short-circuit protection for cables, without being in series with another type of device. current-limiting fuse: A fuse that interrupts all available currents above its threshold current and below its maximum interrupting rating, limits the clearing time at rated voltage to an interval equal to or less than the first major or symmetrical loop duration, and limits peak let-through current to a value less than the peak current that would be possible with the fuse replaced by a solid conductor of the same impedance. Only ClassG, ClassJ, ClassL, ClassR, ClassCC, and ClassT may be marked current limiting. ClassK fuses are, in fact, current limiting, but may not be marked current limiting. Article240-60b of the National Electrical Code (NEC) (NFPA70-1999) prohibits fuse clips for current-limiting fuses from accepting noncurrent-limiting fuses. (See Figure REF RTF31313036363a204669675469 \hError! Reference source not found. .) delay: A term usually applied to the opening time of a fuse when in excess of 1cycle, where the time may vary considerably between types and manufacturers and still be within established standards. This word, in itself, has no specific meaning other than in manufacturers claims unless published standards specify delay characteristics. See: time delay. dual-element fuse: A cartridge fuse having two or more current-responsive elements of different fusing characteristics in series in a single cartridge. The dual-element design is a construction technique frequently used to obtain a desired time-delay response characteristic. Labeling a fuse as dual-element means this fuse meets Underwriters Laboratories (UL) time-delay requirements (i.e., can carry five times rated current for a minimum of 10s for ClassJ, ClassH, ClassK, and ClassR, except for the 0A to 30A, 250V case size ClassH, ClassK, and ClassR fuses, where minimum opening time can be reduced to 8s for five times the rated current). ferrule: The cylindrical-shaped fuse terminal that also encloses the end of the fuse. In low-voltage fuses, the design is only used in fuses rated up to and including 60A. The ferrule may be made of brass or copper and may be plated with various materials. fuse-link: [British Standards Association (BSA) terminology] A complete enclosed cartridge fuse. The addition of a carrier, or holder, completes the fuse. [In the United States] A replaceable part or assembly that comprises entirely or principally the conducting element and is required to be replaced after each circuit interruption to restore the fuse to operating conditions. See: link. high rupturing capacity (HRC): [British Standards Association (BSA) and Canadian Standards Association (CSA) terminology] A term equivalent to National Electrical Manufacturers Association (NEMA) high interrupting rating and generally indicating capability of interruption of at least 100000A root-mean-square (rms) for low-voltage fuses. I2t (ampere-squared seconds): A factor of heat energy developed within a circuit during the fuses melting or arcing. The sum of melting and arcing I2t is generally stated as total clearing I2t. Actual energy is I2rt, but r (resistance) is assumed as a constant for comparison (see Figure  REF RTF33363837383a204669675469 \hError! Reference source not found.). interrupting rating: The rating based upon the highest root-mean-square (rms) ac or dc current that the fuse is tested to interrupt under the conditions specified. The interrupting rating, in itself, has no direct bearing on any current-limiting effect of the fuse. link: The current-responsive element in a fuse that is designed to melt under overcurrent conditions and interrupt the circuit. A renewal link is one intended for use in ClassH low-voltage renewable fuses. melting time: The time required to melt the current-responsive element on a specified overcurrent. Where the fuse is current limiting, the melting time may be approximately half or less of the total clearing time. (Sometimes referred to as pre-arcing time.) (See Figure REF RTF31313036363a204669675469 \hError! Reference source not found..) NEC dimensions: Dimensions once stated in the National Electrical Code (NEC) (NFPA70-1999), but now found in Underwriters Laboratories (UL) and Canadian Standards Association (CSA) standards. These dimensions are common to ClassH and ClassK fuses and provide interchangeability between manufacturers for fuses and fusible equipment of a given ampere and voltage range. one-time fuse: Strictly speaking, any nonrenewable fuse, but generally accepted and used to describe any ClassH or ClassK nonrenewable cartridge fuse, with a single (as opposed to dual) fusing element. overload: An overcurrent, or more current than normal, that stays in the normal current path. peak let-through current (IP): The maximum instantaneous current through a current-limiting fuse during the total clearing time. Because this value is instantaneous, it exceeds the root-mean-square (rms) available current, but is less than the peak current available without a fuse in the circuit if the fault level is high enough for it to operate in its current-limiting mode. (See Figure REF RTF31313036363a204669675469 \hError! Reference source not found..) plug fuses: Fuses that are rated 125V and available with current ratings up to 30A. Their use is limited to circuits rated 125V or less. However, they may also be used in circuits supplied from a system having a grounded neutral and in which no conductor operates at more than 150V to ground. The National Electrical Code (NEC) (NFPA70-1999) requires TypeS fuses in all new installations of plug fuses because they are tamper resistant and size limiting and thus make overfusing difficult. pre-arcing time: See: melting time. renewable fuse: A fuse in which the element, usually a zinc link, may be replaced after the fuse has opened. Once a popular item, this fuse is gradually losing popularity due to the possibility of using higher ampere-rated links or multiple links in the field. selectivity: A general term describing the interrelated performance of protective devices. Complete selectivity is obtained when a minimum amount of equipment is removed from service for isolation of a fault or other abnormality. short-circuit current: An overcurrent, or more current than normal, that goes outside the normal current path when it is shunted around the load. See: overload. threshold current: The magnitude of current at which a fuse becomes current limiting, specifically, the symmetrical root-mean-square (rms) available current at the threshold of the current-limiting range, where the fuse total clearing time is less than 0.5cycle at rated voltage and rated frequency, for a symmetrical closing, at a power factor of less than 20%. The threshold ratio is simply the ratio of the threshold current to the fuses continuous-current rating. time delay: A term now used by National Electrical Manufacturers Association (NEMA), American National Standards Institute (ANSI), Underwriters Laboratories (UL), and Canadian Standards Association (CSA) to mean, in ClassH, ClassK, ClassJ, and ClassR cartridge fuses, a minimum opening time of 10s on an overload current five times the ampere rating of the fuse, except for ClassH, ClassK, and ClassR, 0A to 30A, 250V case size where the minimum opening time can be reduced to 8s for five times the rated current. Such time-delay is particularly useful in allowing the fuse to pass the momentary starting overcurrent of a motor, yet not hindering the opening of the fuse should the overload persist. In ClassG, ClassCC, and plug fuses, the phrase time-delay requires a minimum opening time of 12s on an overload of twice the fuses ampere rating. The time-delay characteristic does not affect the fuses short-circuit current clearing ability. Time-delay is in contrast with the term nontime-delay or fast-acting as applied to other fuse types. total clearing time: The total time between the beginning of the specified overcurrent and the final interruption of the circuit, at rated voltage. It is the sum of the minimum melting time plus tolerance and the arcing time. For clearing times in excess of 0.5cycle, the clearing time is substantially the maximum melting time for low-voltage fuses. (See Figure REF RTF31313036363a204669675469 \hError! Reference source not found..) tube: The cylindrical enclosure of a fuse. It may be made of laminated paper, special fiber, melamine impregnated glass cloth, bakelite, ceramic, glass, plastic, or other materials. voltage rating: The root-mean-square (rms) ac (or the dc) voltage at which the fuse is designed to operate. All low-voltage fuses function on any lower voltage, but use on higher voltages than rated is hazardous. For high short-circuit currents, increasing the voltage increases the arcing and clearing times and the clearing I2t values. Documentation The various electrical industry standards about fuses are highlighted in this clause. Each is available from its source and should be studied for detailed requirements. Standards from Underwriters Laboratories (UL) and Canadian Standards Association (CSA) UL248-1-2000 and CSAC22.2 No.248.1-2000 provide general requirements for low-voltage fuses (1000V or less). Subsequent, detailed parts, along with the general requirements, are described in  REF RTF31393934313a2048342c312e \hClass H fuses through  REF RTF33363639313a2048342c312e \hDC fuses. Figure REF RTF38393734323a204669675469 \hError! Reference source not found. shows the classification of low-voltage fuses covered by the standards. Class H fuses UL248-6-2000 and CSAC22.2 No.248.6-2000 cover nonrenewable ClassH fuses. UL248-7-2000 and CSAC22.2 No.248.7-2000 cover standard renewable ClassH fuses. These fuses are rated 250V or 600V, 600A or less, and are in accordance with the National Electrical Code (NEC) (NFPA70-1999). These fuses are not recognized as being current limiting. They shall not bear a marking that states or implies that they are current limiting. Neither a fuse nor its carton may be marked direct current or dc unless found suitable for use on both ac and dc. (See  REF RTF33363639313a2048342c312e \hDC fuses.) Fuses marked time-delay, D, dual element, or any phrase of similar significance should not open in less than 10s at five times their rating, except for the 250V, 30A case size, which has a minimum 8s opening time at five times their rating. The principal requirements are dimension, design, construction, performance, and markings. Under performance, the fuses are tested for the following: Continuous-current-carrying ability and temperature rise. Overload operation within prescribed maximum times at 135% and 200% of the fuses continuous-current rating. Time-delay test (optional) for a minimum opening time of 10s at five times the continuous-current rating, except for fuses of 0A to 30A, 250V, minimum clearing time may be reduced to 8s at 500%. A fuse may be labeled time delay, dual element, etc. only if it passes this test. Short-circuit interrupting capability at 10000A root mean square (rms) (ac). DC testing is optional. ClassG, ClassJ, ClassL, ClassCC, ClassC, ClassCA, and ClassCB The following standards cover the indicated fuses: Fuse classStandardGUL 248-5-2000 and CSA C22.2 No. 248.5-2000JUL 248-8-2000 and CSA C22.2 No. 248.8-2000LUL 248-10-2000 and CSA C22.2 No. 248.10-2000CCUL 248-4-2000 and CSA C22.2 No. 248.4-2000CUL 248-2-2000 and CSA C22.2 No. 248.2-2000CA and CBUL 248-3-2000 and CSA C22.2 No. 248.3-2000 These requirements cover nonrenewable cartridge fuses that limit the peak let-through current and the total I2t and that exhibit current-limiting characteristics above specified values of current. These fuses have different dimensional characteristics than ClassH and ClassK fuses to meet noninterchangeability requirements of current-limiting fuses. (See NEC Article240-60b and Figure REF RTF39313730303a204669675469 \hError! Reference source not found..) ClassG fuses have an ac rating to interrupt 100000A rms. They are labeled as current-limiting, have an ac rating of 480V (2560A) and 6000V (020A), and may have an additional optional dc rating up to 480V. Their dimensions are not interchangeable with other classes of fuses. ClassG fuses may be either fast-acting or time-delay. ClassG fuses are available up through 60A in four different body sizes (015A, 20A, 25 and 30A, and 3560A). ClassJ fuses have an ac rating to interrupt 200000A rms. They are labeled as current-limiting, have an ac rating of 600V, and may have an additional optional dc rating up to 600V. Their dimensions are not interchangeable with other classes of fuses. ClassJ fuses may be either fast-acting or time-delay. ClassJ fuses that have a time delay of at least 10s at five times rated current may have time delay or the equivalent written on the label. ClassL fuses have ratings in the range of 601A to 6000A, have an ac rating to interrupt 200000A, have an ac rating of 600V, and have specified dimensions larger than those of other fuses rated 600V (or less). They are intended to be bolted to bus bars and are not used in clips. UL has no definition of time delay for ClassL fuses; however, many ClassL fuses have substantial overload time-current carrying capability. ClassL fuse standards do not include 250V ratings. ClassCC fuses have an ac rating to interrupt 200000A rms. They are labeled as current-limiting, have an ac rating of 600V, and may have an additional optional dc rating up to 600V. Rejection features in fuse clips for ClassCC fuses reject all but ClassCC fuses. They may be either fast-acting or time-delay. ClassCC fuses are available up through 30A in one case size. ClassC fuses have an ac rating to interrupt 200000A rms. They may be marked current-limiting if they pass a threshold current test. ClassC fuses have an ac rating of 600V and may have an additional optional dc rating up to 600V. ClassC fuses are available up through 1200A in four case sizes (0100A, 101200A, 201800A, and 8011200A). ClassCA and ClassCB fuses have an ac rating to interrupt 200000A rms. They are labeled as current-limiting, have an ac rating of 600V, and may have an additional optional dc rating up to 600V. ClassCA fuses are available up through 30A and have mounting holes in their end blades. ClassCB fuses are available up through 60A, without mounting holes in their end blades. ClassCB fuses have two body sizes (030A and 3560A). Class K UL248-9-2000 and CSAC22.2 No.248.9-2000 cover fuses made in the same dimensions as ClassH fuses, but which have an ac rating to interrupt 50000A, 100000A, or 200000A rms. ClassK fuses have prescribed values of peak let-through current and I2t for each case size (030A, 3160A, 61100A, 101200A, 201400A, and 401600A). Because they have no required threshold ratio and are interchangeable with ClassH fuses, they are not labeled as current limiting. See NEC Article240-60(b). They are rated up to 600A in both 250V and 600V sizes. ClassK fuses are tested for continuous-current-carrying ability, temperature rise, overload opening, and an optional time-delay test of 10s (8s for 250V, 30A case size) at five times the current rating in order to be labeled as time delay, dual element, etc. They are also tested at various short-circuit levels up to their maximum interrupting rating and for compliance with prescribed maximum values of peak let-through current and I2t for each of the three divisions: K-1, K-5, and K-9 . K-1 fuses are required to have the lowest I2t and IP let-through values. K-5 fuses are allowed to have higher values, and K-9 fuses have the highest I2t and IP limits. They are labeled for the class subdivision, interrupting rating, amperes, and maximum voltage. NOTEAny one manufacturer may produce two or three Class K-5 fuses with different interrupting ratings or with the same interrupting rating and differing peak let-through and I2t values distinguished by catalog numbers, but all within the requirements of that class. Class R UL248-12-2000 and CSAC22.2 No.248.12-2000 cover ClassR fuses. They have ac ratings to interrupt 200000A. The standard has prescribed values for maximum peak let-through currents, I2t and threshold current, with subclass RK-1 having the lowest (or most restrictive) values as compared to subclass RK-5. Fuseholders designed to accept ClassR fuses do not accept ClassH or ClassK fuses or any other class. However, ClassR fuses do fit into ClassH or ClassK fuseholders. ClassR fuses are available with or without time delay. If marked time delay or similarly, they are required to have a minimum opening time of 10 s when subjected to a load of five times rated current, except for the 0A to 30A, 250V case size, where minimum opening time can be reduced to 8s for five times the rated current. Plug fuses UL248-11-2000 and CSAC22.2 No.248.11-2000 cover Edison base and TypeS base plug fuses, which may or may not be provided with time-delay characteristics. TypeS base plug fuses have rejection features that limit the ampere rating of fuses that may be installed in a particular fuseholder. Supplemental fuses UL248-14-2000 and CSAC22.2 No.248.14-2000 cover glass, miniature, micro, and other miscellaneous fuses for supplementary protection. These standards do not pertain to branch circuit fuses. Class T UL248-15-2000 and CSAC22.2 No.248.15-2000 cover ClassT current-limiting fuses. These fuses have characteristics similar to ClassJ fuses, but are dimensionally smaller. They are available in ac ratings up to 1200A at both 300V and 600V. As current-limiting fuses, they are not dimensionally interchangeable with any other class of fuse. ClassT fuses have an ac rating to interrupt 200000A rms. DC fuses Optional requirements for dc are found in UL248-1-2000, CSAC22.2 No.248.1-2000, and UL 198L-1995. Preferred dc voltage ratings are 60V, 125V, 160V, 250V, 300V, 400V, 500V, and 600V. Preferred dc interrupting ratings are 10000A, 20000A, 50000A, 100000A, 150000A, and 200000A. These requirements cover ClassC, ClassCA, ClassCB, ClassCC, ClassG, ClassH, ClassJ, ClassK, ClassL, ClassR, and ClassT fuses. UL198M-1995 covers requirements for ClassK and ClassR fuses intended for use in protecting trailing cables in dc circuits in mines. The standard follows the requirements of the US Department of Labors Mine Safety and Health Administration (MSHA). These fuses have a maximum rating of 600A, with a voltage rating of 300V or 600V. The maximum dc interrupting rating is 20000A. NEMA FU-1-1986 NEMA FU-1-1986 covers low-voltage cartridge fuses with requirements that are similar to the requirements found in the UL and CSA standards given in  REF RTF33383735393a2048332c312e \hStandards from Underwriters Laboratories (UL) and Canadian Standards As. The NEC NEC articles that apply to fuses include 110-9, Interrupting Rating Requirements 110-10, Circuit Impedance and Other Characteristics 240-02, List of Articles Covering Overcurrent Protection for Specific Equipment 240-6, Standard Ampere Ratings 240-11, Definition of Current-Limiting Protective Device 240-50, Plug Fuses, Fuseholders, and Adapters 240-51, Edison Base Fuses 240-53, Type S Fuses 240-54, Types S Fuses, Adapters, and Fuseholders 240-60b, Noninterchangeability 240-60c, Marking on Fuses 240-61, Fuse Classification Standard dimensions UL and CSA have established the dimensional requirements for the various classifications of low-voltage fuses. Figure REF RTF31333431333a204669675469 \hError! Reference source not found. through Figure REF RTF34323033393a204669675469 \hError! Reference source not found. show typical dimensions (see fuse manufacturers data for actual dimensions) for ClassH, ClassK, ClassL, ClassG, ClassJ, ClassT, ClassCC, and ClassR fuses. Typical interrupting ratings Interrupting ratings of low-voltage fuses expressed in rms symmetrical amperes are as follows: FuseTypical interrupting rating (kA)Class H10Class K50, 100, or 200Class RK-1 and Class RK-5200Class J, Class CC, Class T, and Class L200Class G100Plug fuses10 Some fuses that meet the dimensional and performance requirements of ClassRK-1, ClassJ, and ClassL fuses have been listed or certified as special purpose with interrupting ratings of 300000A. Achieving selectivity with fuses Basic considerations Because the electrical distribution system is the heart of most industrial, commercial, and institutional installations, preventing any unnecessary shutdowns of electrical power is imperative. Such incidents can be avoided by the proper selection of overcurrent protective devices. Selectivity (often referred to as selective coordination) is obtained when a minimum amount of equipment is removed from service for isolation of an overcurrent condition. Figure REF RTF33323334353a204669675469 \hError! Reference source not found. shows a selective system. Figure REF RTF33323432303a204669675469 \hError! Reference source not found. illustrates the general principle by which current-limiting fuses coordinate for any value of short-circuit current sufficient for them to operate in the current-limiting mode. For selectivity, the total clearing I2t of FuseB should be less than the minimum melting I2t of FuseA. In low-voltage fuse applications, coordination may sometimes be determined through the use of selectivity ratio tables (see  REF RTF32363036383a2048332c312e \hSelectivity ratio tables). Time-current characteristic (TCC) curves TCC curves of fuses show the relationship between various overcurrrent values and their respective opening times. They are plotted on transparent log-log paper so they may be easily traced. The current values are normally represented on the abscissa (or bottom of the curve). The time values are shown on the ordinate (or vertical side) and may represent the minimum melting time, average melting time, or total clearing time, as specified on the curve. The average melting time is assumed to be represented unless otherwise stated. It represents an opening characteristic having a maximum tolerance of 15% in current for any given time. Thus the 15% boundary represents the minimum melting characteristic, and the +15% boundary usually represents the total clearing time. For times greater than 0.1s, the maximum melting time is essentially the same as the total clearing time. For times less than 0.01s, the arcing time may be equal to or greater than the maximum melting time. In these short periods, the I2t (or fault energy) becomes of increasing importance. The curves in Figure REF RTF33333333373a204669675469 \hError! Reference source not found. and Figure REF RTF33303231333a204669675469 \hError! Reference source not found. show the average melting time characteristics for RK-5 time-delay fuses (30600A) and ClassL current-limiting fuses (8006000A), respectively. Selectivity ratio tables Table REF RTF31333935383a205461626c65 \hTypical selectivity schedul shows a typical selectivity schedule for various combinations of fuses. This schedule is general and is different for each fuse manufacturer. Specific data are available from the fuse manufacturers. An example of using Table REF RTF31333935383a205461626c65 \hTypical selectivity schedul is found in Figure REF RTF31373734343a204669675469 \hError! Reference source not found. , where a 1200A ClassL fuse is to be selectively coordinated with a 400A ClassJ current-limiting fuse. Typical selectivity schedulea for low voltage fusesLine sideLoad sideClassL fuse 6016000AClassK1 fuse 0600AClassJ fuse 0600AClassK5 time-delay fuse 0600AClassJ time-delay fuse 0600AClassG fuse 060AClassL fuse 6016000A2:12:12:16:12:1ClassK1 fuse 0600A2:13:18:14:14:1ClassJ fuse 0600A3:13:18:14:14:1ClassK5 time-delay current-limiting fuse 0600A1.5:11.5:12:11.5:12:1ClassJ time-delay fuse 0600A1.5:11.5:18:12:12:1NOTEFor illustration only. Refer to fuse manufacturer for specific and up-to-date data.aExact ratios vary with ampere ratings, system voltage, and short-circuit current. Selectivity schedules or tables are used as a simple check for selectivity, assuming that identical or reduced fault currents flow through the circuits in descending order, that is, from main, to feeder, to branch. Where closer fuse sizing than indicated is desired, the fuse manufacturer should be consulted as the ratios may be reduced for lower values of short-circuit current. A coordination study may be desired when the simple check as outlined is not sufficient and can be accomplished by plotting fuse TCC curves on standard log-log graph paper. If fuse ratios for high- or medium-voltage fuses to low-voltage fuses are not available, it is recommended that the fuse curves in question be plotted on log-log paper. Also, fuse ratios cannot be used with fuses at different voltages or from different manufacturers. Fuse manufacturers can furnish selectivity tables showing actual ampere ratings. NOTEAt short-circuit power factors greater than 15%, peak and equivalent rms let-through currents are less than the values that can be determined from a let-through chart. However, no acceptable method has been developed to determine these lower values. Therefore, the line with a slope of 2.3 may not be moved to the right or left to account for power factors other than 15%. These charts then provide worst case values for power factors of 15% or greater. Example selectivity study A typical example showing selectivity between a high-voltage and a low-voltage fuse using this graphic analysis is shown in Figure REF RTF32323731353a204669675469 \hError! Reference source not found.. The total clearing curve of the 1200A low-voltage fuse and the minimum melting curve of the 125E-rated 5kV fuse are separated by clear space and thus are said to be selective. The curves are referred to 240V because this study is of secondary faults. Current-limiting characteristics Due to the speed of response to short-circuit currents, current-limiting fuses have the ability to cut off the current before it reaches its full prospective short-circuit value. Figure REF RTF31313036363a204669675469 \hError! Reference source not found., Figure REF RTF33363837383a204669675469 \hError! Reference source not found. , and Figure REF RTF33323432303a204669675469 \hError! Reference source not found. show the current-limiting action of fuses. The available short-circuit current would flow if no fuse were in the circuit or if a noncurrent-limiting protective device were in the circuit. In its current-limiting range, a current-limiting fuse limits the peak current to a value less than the available value; opens in 0.5cycle or less in its current-limiting range; and, therefore, lets through only a portion of the available short-circuit energy. The degree of current limitation is usually represented in the form of peak let-through current charts. Peak let-through current charts Peak let-through current charts (sometimes referred to as current-limiting effect curves) are useful for determining the degree of short-circuit protection that a current-limiting fuse provides to the equipment beyond it. These charts show fuse peak let-through current as a function of available symmetrical rms current, as shown in Figure REF RTF34303535363a204669675469 \hError! Reference source not found.. The straight line running from the lower left to the upper right shows a 2.3 relationship (based on a 15% power factor; see UL248-1-2000 and CSAC22.2 No.248-1-2000) between the peak current that would occur without a current-limiting devise in the circuit and the available symmetrical rms current. Peak let-through current and apparent equivalent rms let-through current can be determined from the let-through current charts and are useful in relating to equipment withstandability. Let-through data may be compared to short-circuit ratings of the fixed components that are static and have a time rating of 0.5cycle or longer at a test circuit power factor of 15% or greater. Examples include wire, cable, and bus. An example showing the application of the let-through current charts is represented in Figure REF RTF32313334323a204669675469 \hError! Reference source not found., where the load-side component is protected by an 800A current-limiting fuse. Example: Determine the fuse let-through current values with 40000A rms symmetrical available at the line side of the fuse. Enter the let-through current chart of Figure REF RTF34303535363a204669675469 \hError! Reference source not found. at an available current of 40000A rms symmetrical, and find a fuse peak let-through current of 38000A and an effective rms current of 16500A. The clearing time is less than 0.5cycle. The load-side circuit components is not subjected to an I2t duty greater than the total clearing let-through I2t of the fuse. Magnetic forces vary with the square of the peak current IP2 and can be severe. These forces can be reduced considerably when current-limiting fuses are used. Maximum clearing I2t I2t is a measure of the energy that a fuse lets through while clearing a fault. Every piece of electrical equipment is limited in its capability to withstand energy. The equipment I2t withstand rating can be compared with maximum clearing I2t values for fuses. These maximum clearing I2t values are available from fuse manufacturers. Special applications for low-voltage fuses Bus-bracing requirements Reduced bus-bracing requirements may be attained when current-limiting fuses are used. Figure REF RTF34303337363a204669675469 \hError! Reference source not found. shows an 800A motor-control center being protected by 800A ClassL fuses. The maximum available fault current to the motor-control center is 40000A rms symmetrical. If a noncurrent-limiting device were used ahead of the motor-control center, the bracing requirement would be a minimum of 40000A rms symmetrical, with a peak value of 92000A (2.3 40000A). For this example with current-limiting fuses, the maximum peak current has been reduced from 92kA to 38kA with a corresponding reduction in effective rms available current from 40kA to 16.5kA. As a result, bus bracing of 16.5kA or greater is possible rather than requiring the full 40kA bracing. Most bus is now listed for maximum short-circuit currents with specific types and sizes of current-limiting fuses. The bus manufacturer should be consulted for these specific combination ratings. Circuit breaker protection Molded case, insulated case, and power circuit breakers protected by current-limiting fuses may be applied in circuits where the available short-circuit current exceeds the interrupting rating of the circuit breakers alone. The short-circuit interrupting rating for older style nondynamic impedance circuit breakers can be compared to fuse let-through current values to determine the degree of protection provided. Using present methods, engineering protection for modern circuit breakers exhibiting dynamic impedance through the use of repulsion (or blow-apart) contacts is not possible. However, nationally recognized testing laboratories have developed a set of tests that do establish that a particular fuse and circuit breaker combination will successfully clear a fault. These successful combinations are given a series rating and are typically published in recognized component directories. These recognized combinations should be specified for use in load centers, panelboards, and switchboards that have been tested, listed, and marked for their use. The circuit breaker and fuse manufacturers should be consulted for proper applications. An example of applying fuses to protect molded-case circuit breakers is given in Figure REF RTF31383933373a204669675469 \hError! Reference source not found., where an older 225A lighting panel has circuit breakers with an interrupting rating of 14000A rms symmetrical. The available fault current at the line side of the lighting panel is40000A rms symmetrical. A 400A RK-1 fuse would reduce the current at the circuit breakers to an effective 8000A rms available. With this significant level of current limitation by the fuse ahead of the circuit breaker, the circuit breaker will interrupt an effectively lower short circuit that is within its interrupting rating. Wire and cable protection Fuses should be sized for conductor protection according to the NEC. When noncurrent-limiting overcurrent protective devices are used, reference should be made to the insulated cable thermal damage charts for short-circuit withstands of copper and aluminum cable in ICEA P-32-382-1999. (Also, see Chapter 9.) When current-limiting fuses are used, small conductors are protected from high-magnitude short-circuit currents even though the fuse may be 300% to 400% of the conductor ampacity rating as allowed by the NEC for nontime-delay fuses for motor branch circuit protection. Motor starter short-circuit protection UL tests motor starters under short-circuit conditions (see UL508-1999). The short-circuit test performed may be used to establish a withstand rating for motor starters. UL tests motor starters of 50 hp (37kW) and under with a minimum of 5000A of available short-circuit current. Starters over 50 hp (37kW) in size are tested in similar fashion, except with greater available fault currents. When applying motor starters in systems with high available fault currents, current-limiting fuses are often used to reduce the let-through energy to a value within the withstand of the motor starter. The motor starter manufacturer should be contacted for proper applications. Figure REF RTF33353336383a204669675469 \hError! Reference source not found. is a typical one-line diagram of a motor circuit, where the available short-circuit current has been calculated to be 40000A rms symmetrical at the motor-control center and the fuses are to be selected so that short-circuit protection is provided. The fuse selected should limit the fault current to within the withstand rating of the motor starter. In this case the starter has been investigated and found acceptable for fault levels through 100000A when protected by ClassJ fuses. IEC60947-4-1 describes two types of motor controller protection in terms of the extent of damage to which the motor controller is subjected during a short circuit. Type1 is similar to the requirements for listing in UL508-1999, but the controller may still need to be replaced because of the significant amount of damage allowed. Type2 is much more restrictive and allows no permanent damage to the controller. Many motor controller manufacturers have had UL verify their controllers with ClassJ, ClassRK-1, and ClassCC fuses for Type2 protection in compliance with IEC 60947-4-1. The motor controller manufacturers or fuse manufacturers should be consulted for lists of specific fuses to use with specific controllers. Transformer protection Low-voltage distribution transformers are often equipped on the primary side (above 600V) with medium-voltage fuses sized for short-circuit protection. Transformer overload protection may be provided by fusing the low-voltage secondary with appropriate fuses sized at 100% to 125% of the transformer secondary full-load amperes. Figure REF RTF32313039323a204669675469 \hError! Reference source not found. shows a proper size of low-voltage fuse for a 1000kVA transformer to provide overload protection. Transformers are frequently used in low-voltage electrical distribution systems to transform 480V to 208Y/120V. For these types of transformers, appropriate time-delay fuses should be provided, sized at 100% to 125% of the primary full-load current. Consideration should be given to the magnetizing inrush current because dry- and liquid-immersed transformers have inrush currents equivalent to about 12, or even as high as 18, times full-load rating with a duration of 0.1s (also about 20 to 25 times rating for 0.01s). Inrush currents can be easily checked against the minimum melting curve so that needless opening may be avoided. If necessary, a larger size time-delay fuse may need to be selected. Figure REF RTF31373434353a204669675469 \hError! Reference source not found. shows a 225kVA lighting transformer with time-delay fuses. See Chapter 11 for transformer protection. Motor overcurrent protection Single- and three-phase motors can be protected by specifying time-delay fuses for motor-running overload protection according to the NEC. These ratings depend on service factor, temperature rise, and application (e.g., jogging). Where motor overload relays are used in motor starters, a larger size time-delay fuse may be used to coordinate with the motor overload relays and provide short-circuit protection. Combination motor starters that employ overload relays sized for motor-running protection (maximum of 115% for 1.0 service factor and 125% for 1.15 service factor) can incorporate time-delay fuses sized at 115% (1.0 service factor) or 125% (1.15 service factor) or the next larger size to serve as backup protection. (Larger time-delay fuses, sized up to 175%, may be used for branch circuit protection only.) A combination motor starter with backup fuses provides excellent protection, motor control, and flexibility. Figure REF RTF31393035333a204669675469 \hError! Reference source not found. illustrates the use of fuses for protection of a typical motor circuit. When motors are operated near full-load, single-phasing protection may be provided by time-delay fuses sized at approximately 125% of the motor full-load current. Loss of one phase, either primary or secondary, results in an increase in the line current to the motor. This change is sensed by the motor fuses because they are sized at 125%, and the single-phasing current opens the fuses. If the motors are operated at less than full load, the overload relays and time-delay fuses should be sized to the actual running amperes of the motor. For example, if a motor with a full-load rating of 10A is being used in a situation where it is drawing only 8 A, the time-delay fuses should be sized at 10A instead of 12A. Another option is to utilize antisingle-phasing motor overload relays. DC applications Most dc systems require some form of overcurrent and/or short-circuit protection (see Brozek). These systems include dc motor drives and controllers, semiconductor components, telecommunication switching stations (both power and signal), electrical relay and control circuits for medium-voltage circuit breakers, and transit substations. Battery-powered applications from automobiles and factory warehouse vehicles to more sophisticated loads such as uninterruptible power supply (UPS, or battery backup) systems also require dc overcurrent protection. As with any fuse selection, the three elements of system voltage, normal load current, and available short-circuit current should be considered. For proper application, the fuses ratings should equal or exceed the system parameters. The user should always obtain the proper dc data from the manufacturer. Furthermore, the manufacturers dc test data may not necessarily apply to the dc system at hand. Factors including circuit time constant, voltage, and available short-circuit current may preclude the use of certain dc-rated fuses. A common misconception is that all published ac fuse data may be used for those same fuses on dc systems. Time-current curves that predict a fuses opening time under overload conditions can be used for ac and sometimes dc current. These curves are typically based on rms current, which is thermally equivalent to dc current. However, dc applications have an added twist in that the time constant of the system should also be considered. The dc time constant affects the melting and clearing time of the fuse under overload and short-circuit conditions. The net result is typically a lower voltage rating for the fuse. For a better understanding of how fuses are rated for dc, see UL198L-1995. UL198L-1995 UL198L-1995 defines the requirements and test procedures for dc-rated fuses for industrial use in accordance with the NEC. Fuses that are tested to UL198L-1995 should first meet the requirements of their respective ac standard. Overload test Fuse selection for the overload test is based on internal construction and case size (see UL198L-1995). The largest ampere rating for each internal design and/or case size is sampled. These fuses should open a circuit adjusted to obtain 200% of the current rating at rated dc voltage. For fuses with current ratings greater than 600A, the test circuit can deliver 200% to 300% of the current rating at rated dc voltage. The time constant for this test cannot be less than the value given by  where T is the time constant (ms), I is the test current (A). The time constant is the time required for the current to reach 63.2% of the test current and is shown in Figure REF RTF33363730333a204669675469 \hError! Reference source not found.. Additionally, fuses marked with D, time delay, dual element or similar designations and in compliance with time-delay fuse requirements are to be tested on a circuit adjusted to 900% of the fuse rating at rated dc voltage. (This test is not required for ClassL fuses.) For both the 200% and 900% test, the test voltage is maintained for 1min after circuit interruption to insure that the fuse has permanently cleared the circuit. To pass the test, the fuse casing cannot char or rupture, and external solder connections cannot melt. The time required for the fuse to clear is not specified. Interrupting ability test To establish the short-circuit interrupting rating, fuses are tested at one of the following dc voltage levels: 60V, 125V, 160V, 250V, 300V, 400V, 500V, or 600V (see UL198L-1995). A ClassH fuse has a maximum dc interrupting rating of 10000A. All other classes rated 600A or less have maximum dc interrupting ratings of 10000A, 20000A, 50000A, or 100000A. ClassL and ClassT fuses greater than 600A have maximum interrupting ratings of 20000A, 50000A, or 100000A. The time constant for these heavy short-circuit tests cannot be less than 10ms. As in the overload test, the largest ampere rating for each internal design and/or case size is sampled. To pass, the fuse should remain intact and permanently clear the circuit. The overall length of the cylindrical portion of the fuse cannot be deformed more than 3.2 mm, and molten solder cannot be emitted. After interruption, the recovery voltage is continuously applied for 30s to ensure that the fuse has become quiescent. Evidence of smoking, unusual heating, or internal arcing during this period is unacceptable. When the interrupting ability test is conducted above 10000A, the peak let-through current and clearing I2t cannot exceed the established ac values for the respective fuse class. DC listed ClassL fuses have a minimum interrupting rating of 20kA. However, UL248-10-2000 and CSAC22.2 No.248.10-2000 have 50kA as the lowest fault level for which maximum clearing I2t and I peak are defined. Table REF RTF32333738343a205461626c65 \hShort-circuit values for Class L fuses indicates these values for 50kA available short-circuit current. Short-circuit values for Class L fusesAmperage rangeClearing I2t 106 a IP 103b 601 8001080801 120012801201 1600221001601 200035110aUnits are rms amperes2seconds 106 bUnits are peak amperes 103 Maximum values taken from various fuse classes are shown in Table REF RTF31323039343a205461626c65 \hMaximum clearing. The clearing values shown in Table REF RTF32333738343a205461626c65 \hShort-circuit values for Class L fuses and Table REF RTF31323039343a205461626c65 \hMaximum clearing are the maximum allowable to meet UL198L-1995. Actual values of clearing I2t and Ip may be much less than the maximums and can be obtained from the fuse manufacturer. Maximum energy test The final short-circuit test for fuse types with interrupting ratings greater than 10000A is the maximum energy test (see UL198L-1995). These fuses should interrupt short-circuit current of at least 10000A and limit the peak let-through current to 60% to 80% of the peak available. The largest amperage size of each fuse case size is sampled. Before testing, fuses are preconditioned in a high-humidity environment for 5days. Fuses listed to UL198L-1995 typically are rated at a dc voltage level lower than the ac rating. The lower voltage rating is a direct result of the time constant requirement within the standard. Maximum clearing I2t and Ip for various fuse classes: available short-circuit current between threshold and 50kA rmsAmperage rangeClass CCClass JClass RK5Clearing I2t 103 aIp 103 bClearing I2t 103 aIp 103 bClearing I2t 103 aIp 103 b02023765011213076765011316030820020611006012500221012002001616003221040010002550005040160025003510000656018008011200Amperage rangeClass RK1Class T (600V)Class T (300V)Clearing I2t 103 aIp 103 bClearing I2t 103 aIp 103 bClearing I2t 103 aIp 103 b0 20106763.5521 30106763.5531 60401030815761 100100146012409101 200400182001615013210 40012003310002555022401 600300043250035100031601 800  400050150037801 1200    350050aUnits are rms amperes2seconds 103 bUnits are peak amps 103  Mine duty fuses UL198M-1995 is an additional procedure to list ClassK and ClassR fuses intended for use in protecting trailing cables in dc circuits in mines. The standard follows MSHA requirements. Fuses tested to UL198M-1995 should first comply with their respective ac standard. The dc voltage ratings for UL198M-1995 are 300V or 600V. The largest ampere rating for each internal design and/or case size is sampled after temperature and humidity conditioning. The overload and short-circuit requirements are given in Table REF RTF32393137383a205461626c65 \hTests of fuses. Tests of fuses200% clearing at rated voltagea300% clearing at rated voltageb900% overload at rated voltageInterrupting ability at 10000 AInterrupting ability at 20000 ASource: UL198M-1995.aFor fuses with a rating 200A or less bFor fuses with a rating greater than 200A The minimum time constants for this test are shown in Table REF RTF34303534323a205461626c65 \hCircuit time constants. The time constants required for UL198M-1995 are greater than the time constants in UL198L-1995. Fuses are tested both in open fuse clips and in trolley-tap fuseholders. After the fuse interrupts the circuit, the test voltage is applied for 30s. Performance is acceptable if the fuse clears without excessive smoking or excessive venting of gases. Circuit time constantsTest current (A)Time constant (ms)09921009996100099998+1000016 Superficial damage to the fuse is allowable, that is, a maximum of 1.588 mm hole in any metal part of fuse or a maximum of one 3.175 mm opening in any nonmetal part of the fuse. Restrike is allowable within 30ms of initial current interruption. If a restrike occurs, the test voltage is again applied for 30s, and no further restriking is allowable. Fuses tested in the trolley tap fuseholder cannot damage the fuseholder. UL198M-1995 does not specify peak allowable let-through current or maximum I2t values. It is exceedingly difficult for fuses to just survive this test because of the voltage constraints and relatively long time constants. For a better understanding of how these parameters affect the fuse, an explanation of circuit time constant is given in  REF RTF32393432383a2048342c312e \hDC time constant. DC time constant The circuit time constant is the time required for the current to reach 63.2% of the peak current and may be stated as  where I is current at one time constant, Ip is maximum peak current. The time constant can be calculated by taking the ratio of inductance to resistance L/R in the circuit. In simple terms, magnetic energy is stored in the inductance (in henrys) and opposes any change in current. The relationship between energy and inductance is shown in Equation REF RTF31343334363a204571756174 \h . where U is magnetic energy, L is inductance, i is current. For a circuit with a given resistance, a large inductance causes a slow rate of current rise, and negligible inductance has a fast current rise. The maximum value to which the current rises is limited by the circuit resistance. As a rule of thumb, fuses applied at rated voltage on dc circuits, having time constants less than 2ms, have short-circuit melting and clearing characteristics similar to fuses applied on ac circuits with short-circuit power factors of 15% or greater. This assumption can be made because the current rise time di/dt is comparable. DC voltage ratings To meet the requirements in UL198L-1995 or UL198M-1995, the dc voltage ratings of industrial power fuses are typically derated to about one half of the ac voltage rating. The voltage derating decreases the arcing time needed to equalize to the system voltage, decreases the arcing I2t, and maintains clearing I2t to below the allowable levels. Semiconductor fuses that are designed primarily for dc systems typically have voltage derating charts for a given time constant. One manufacturers voltage derating table is shown in Table REF RTF32383235363a205461626c65 \hVoltage derating vs time constan. Voltage derating vs time constanta Time constant (L/R) msPercentage of rated voltage (rms)700V fuses1000V fuses58090%8595%107080%8090%206070%7085%305570%6580%405065%6075%505065%5570%604560%5065%aBased on fuse opening time of 25300ms For most battery protection applications, fuse operation is straightforward and reliable. Batteries contain little inductance and, as stated by one large UPS manufacturer, a shorted battery is similar to a fault through a resistor. A shorted battery drains rapidly and gives rise to high di/dt. Fuses listed to UL198L-1995 (and certainly UL198M-1995) are generally applicable for UPS battery protection. Proper placement of the fuse in a battery circuit is beyond the scope of this recommended practice (see Nailen). For applications where inductive loads are present (e.g., in motors, solenoids, any other coil loads), the circuit time constant should be determined to ensure proper application of the fuse. By specifying fuses with a rated dc voltage beyond the system voltage, the user incorporates more leeway into the allowable time constants. If the dc voltage capability in a particular fuse application is uncertain, the fuse manufacturer should be consulted. Time Current Curves Current Liminting fuses Current-limiting and expulsion power fuse designs Current-limiting power fuses Current-limiting power fuses generally consist of an insulating support (or mounting) and a fuse unit. Their principal applications are for protecting voltage (or potential) transformers (VTs), auxiliary transformers, power transformers, and capacitor banks, and in other applications where their high interrupting ratings and current-limiting properties are beneficial. Because current-limiting fuses do not emit any expulsion gases, they can be used in enclosures or vaults. At present, the application of these types of fuses is in areas where the voltage is between 2.4 kV and 34.5 kV nominal. The ratings for this style of fuse are given in Table REF RTF33373839333a205461626c65 \hMaximum continuous-current and short-circuit interrupting rating fo. Maximum continuous-current and short-circuit interrupting rating for current-limiting power fusesRated maximum voltage (kV)Continuous-current ratings (A) (maximum)Short-circuit maximum interrupting ratings (kA, rms symmetrical)2.75225, 450, 750,a 1350a50.0, 50.0, 40.0, 40.02.75/4.76450a50.05.5225, 400, 750,a 1350a50.0, 62.5, 40.0, 40.08.25125, 200a50.0, 50.015.565, 100, 125,a 200a85.0, 50.0, 85.0, 50.025.850, 100a35.0, 35.038.050, 100a35.0, 35.0 Current-limiting power fuses have three features that have led to their extensive usage on medium-voltage power distribution circuits having high fault currents: Interruption of overcurrents is accomplished quickly without the expulsion of arc products or gases, as all the arc energy of operation is absorbed by the sand filler of the fuse and subsequently released as heat at relatively low temperatures. This feature enables the current-limiting fuse to be used indoors or in enclosures of small size. Furthermore, because no hot gases are discharged, only normal electric clearances need to be provided. The absence of expulsion by-products also permits the fuse to be immersed in dielectric fluid. The operation of a current-limiting fuse causes a reduction in the peak current through the fuse to a value less than the current available from the power system if the fault current greatly exceeds the continuous-current rating of the fuse. Such a reduction in current reduces the stresses and possible damage to the circuit up to the fault or to the faulted equipment itself. For a current-limiting fuse used with a motor starter, the contractor is required only to have momentary current and to make current capabilities equal to the maximum let-though current of the largest current rating of the fuse that is used in the starter. Very high interrupting ratings are achieved by virtue of current-limiting action so that current-limiting power fuses can be applied on medium-voltage distribution circuits having very high short-circuit capacity. It should be noted that current-limiting fuses limit the let-through current by producing an arc voltage in excess of system voltage. This arc voltage may affect insulation coordination and the application of surge arresters (see Table REF RTF34303634303a205461626c65 \hError! Reference source not found. and  REF RTF32393333363a2048342c312e \hError! Reference source not found.). Current-limiting power fuses are typically clip-mounted. Also available are current-limiting fuses that mount in industry-recognized fiber-lined and solid-material mountings used for power expulsion fuses described in  REF RTF32393239393a2048332c312e \hFiber-lined and solid-material expulsion power fuses. Fiber-lined and solid-material expulsion power fuses Expulsion power fuses generally consist of an insulating support (i.e., mounting) plus a fuse unit or, alternately, a fuse holder that accepts a refill unit or a replaceable fuse link. One form of medium-voltage power fuses is the fiber-lined expulsion fuse, employing longer and heavier fuse holders (compared to fuse cutouts) to cope with higher circuit voltages and short-circuit interrupting requirements. Their operating characteristics are similar to the characteristics of a distribution fuse cutout except that the noise and emission of exhaust gases are greatly magnified as the design evolved to handle higher voltages and fault currents. Therefore, this type of fuse has been restricted to outdoor applications in substations. Fiber-lined expulsion power fuses are still used for protection of small and medium power transformers or substation capacitor banks. Table REF RTF32323934363a205461626c65 \hMaximum continuous-current and short-circuit interrupting ratings fo gives the rating for fiber-lined expulsion power fuses. Maximum continuous-current and short-circuit interrupting ratings for fiber-lined expulsion fusesRated maximum voltage (kV)Continuous-current ratings (A) (maximum)Maximum interrupting ratinga (kA, rms symmetrical)8.3100, 200, 300, 40012.515.5100, 200, 300, 40016.025.8100, 200, 300, 40020.038.0100, 200, 300, 40020.048.3100, 200, 300, 40025.072.5100, 200, 300, 40020.0121.0100, 20016.0145.0100, 20012.5169.0100, 20012.5aApplies to all continuous-current ratings. The solid-material boric acid fuse was developed in the 1930s to improve the interrupting capacity of early expulsion fuses and for application inside buildings or enclosures. In this design, the deionizing action necessary to interrupt the fault current was not due to organic material, but solid boric acid molded into a dense lining for the interrupting chamber. The advantages of this design are listed below: For identical dimensions compared to fiber-lined fuse, the boric acid design can interrupt higher currents and be applied at higher voltages and with lower arc energies to reduce emission of gases. Because the gas liberated from the boric acid is noncombustible and highly deionized, the fuse design advantageously uses normal clearance distances required in air. During the interruption process, the heat of the arc liberates steam from the boric acid crystals. This steam can be condensed by an exhaust control device (commonly called an exhaust filter, condenser silencer, or snuffler). This feature allows use indoors and in small enclosures up to 34.5kV. These fuses are available in two styles: The fuse-unit style in which the fusible element, interrupting media, and arc-elongating spring assembly are all combined in an insulating tube and the entire unit being replaceable The fuse-holder and refill-unit style of which only the refill unit is replaced after operation The fuse-unit style is principally used outdoors at transmission and subtransmission voltages (see Figure REF RTF32363538323a204669675469 \hError! Reference source not found.). However, fuses in this style are also available for use at distribution voltages up to 34.5kV, in current ratings up to 400A. The fuse units are specifically designed for outdoor pole-top or station mountings and for indoor mountings installed in metal-enclosed interrupter switchgear, indoor vaults, and pad-mounted gear. Indoor mountings incorporate an exhaust control device that contains most of the arc-interruption products and virtually eliminates noise accompanying a fuse operation. These exhaust control devices do not require a reduction of the fuses interrupting rating. Indoor mountings for use with fuse units up to 25kV can be furnished with an integral hookstick-operated load-current-interrupting device, thus providing single-pole live switching in addition to the fault-interrupting function provided by the fuse. The ratings of the fuse-unit style are given in Table REF RTF31353332333a205461626c65 \hMaximum continuous-current and short-circuit interrupting ratings fo. The refill-unit style of fuse is used either indoors or outdoors at medium voltage, and its ratings are given in Table REF RTF31373235363a205461626c65 \hMaximum continuous-current and short-circuit interrupting ratings fo . Maximum continuous-current and short-circuit interrupting ratings for solid-material power fuses (fuse units)Rated maximum voltage (kV)Continuous-current ratings (A) (maximum)Short-circuit maximum interrupting ratings (kA, rms symmetrical)5.540025.017.0200,40014.0, 25.027.020012.529.040020.038.0100, 200, 3006.7, 17.5, 33.548.3100, 200, 3005.0, 13.1, 31.572.5100, 200, 3003.35, 10.0, 25.0121.0100, 2505.0, 10.5145.0100, 2504.2, 8.75 Maximum continuous-current and short-circuit interrupting ratings for solid-material power fuses (refill units)Rated maximum voltage (kV)Continuous-current ratings (A) (maximum)Short-circuit maximum interrupting ratings (kA, rms symmetrical)2.8200, 400, 72019.0, 37.5, 37.54.8200, 400, 720a19.0, 37.5, 37.55.5200, 400, 720a19.0, 37.5, 37.58.3200, 400, 720a16.6, 29.4, 29.414.4200, 400, 720a14.4, 29.4, 29.415.5200, 400, 720a14.4, 34.0, 29.417.0200, 400, 720a14.0, 34.0, 25.025.8200, 300, 540a10.5, 21.0, 21.027.0200, 30012.5, 20.038.0200, 300, 540a8.45, 17.5, 16.8 Newer types of fuses Demands on electrical circuits have increased over the years with the growth of industrial and utility systems. In many instances fuse ratings covered by standards are no longer adequate. In some cases, the continuous-current requirements exceed existing fuse ratings. In other cases, the short-circuit interrupting capabilities of the fuses is insufficient. In still other instances, the low-current interrupting performance of fuses is a problem. Fuse manufacturers responded to these needs in the early 1980s by combining or integrating new technologies with existing fuse designs. Thus, a variety of modern fuse-like devices have been developed, which make use of one or more of the following technologies: electronic sensing and triggering, pyrotechnics to increase the speed of interruption, and vacuum and magnetically enhanced SF6 interruption. The use of analog and digital circuitry provides for a wide variety of TCC curves, and the inherent flexibility of these curves can result in improved selectivity in tight coordination schemes. These newer devices are described in  REF RTF33363531333a2048342c312e \hPower fuses using vacuum and S through  REF RTF33373632333a2048342c312e \hTriggerable fuses that interrupt upon command. Power fuses using vacuum and SF6 interruption technology Vacuum power fuses Vacuum power fuses are an extension of vacuum power interrupters. A short fuse wire is held axially between two electrodes; hence there is a low arc voltage when the fuse wire is melted by the overcurrent. Thus the total-clearing characteristic is similar to an expulsion fuse. Interruption takes place at a current zero, and dielectric recovery is in high vacuum. SF6 power fuses This type of fuse has an E characteristic. As the relatively short fuse wire melts, an arc is formed within an SF6 chamber. This arc is commutated from the lower electrode to the housing. A coaxial coil is series-connected to the housing. The coil produces an axial magnetic field. It causes the arc to rotate radially between the housing as the first electrode and a central arc runner at the second electrode until a current zero is reached, at which point interruption takes place. Self-triggering fuses that carry high continuous currents In principle, this fuse design consists of two parallel fuses. The first has a short fusible element in series with a heavy copper conductor. This combination carries the continuous current. On overcurrents the fusible element melts and ignites a cutting charge, which cuts and folds back the copper conductor at several predetermined reduced sections. The arcs formed at these sections aid in the commutation of the overcurrent into the parallel current-limiting fuse. This fuse, in turn, melts quickly and interrupts the current in a manner consistent with the principle of a current-limiting fuse. The parallel fuse may be a full range, a general purpose, or a backup current-limiting fuse. These fuses can carry high continuous currents up to 600 A. Their features are low continuous-current losses, current limitation with low let-through currents, and an ability to interrupt substantially lower currents than their continuous-current rating. Triggerable fuses that interrupt upon command In this category several novel fuse types can be distinguished. Their common denominator is a heavy copper conductor in parallel with a current-limiting fuse. The copper conductor carries the continuous current anywhere from 600A to 3000A. In one design, upon command from the sensing or firing logic, which may be integral or remote, the conductor is severed by a chemical charge at predetermined sections. The arcs formed at these gaps aid in commutation of the current to the parallel fuse. Its element is designed to melt quickly and then interrupt the current like a current-limiting fuse. In another design the fuse consists of a circuit interrupter in parallel with a current-limiting fuse in one body. The interrupter is actuated to open the circuit by a chemical actuator. While the interrupter is opening, the current is shunted to the parallel current-limiting fuse, which interrupts the current in a manner consistent with the principle of a current-limiting fuse. The interrupter contacts in the meantime move farther apart isolating the circuit. The interrupter assembly is replaced after each interruption. These types of fuses are combined typically with a built-in current transformer (CT), an electronic sensing logic, which may respond to a predetermined current level, rate of rise of current, an integrated logic, or any combination of these, to provide a trigger signal for the opening of the copper conductor. Some of these logic circuits are combined with additional elements that can delay or shift or even change the shape of the TCCs and thus form a family of TCCs, much like the functions of modern protective relays. The accuracy of these TCCs, along with fast clearing times, provides a narrow band between the minimum operating and total-clearing time, greatly enhancing the coordination possible with these devices. The power for these logic devices may be derived from the CT or transmitted from ground by a small isolation transformer. The trigger signal may also be transmitted from ground to one or more phases by simple pulse transformers, if the sensing and firing logic is located at ground potential. Current-limiting characteristics Due to the speed of response to short-circuit currents, current-limiting fuses have the ability to cut off the current before it reaches its full prospective short-circuit value. Figure REF RTF31313036363a204669675469 \hError! Reference source not found., Figure REF RTF33363837383a204669675469 \hError! Reference source not found. , and Figure REF RTF33323432303a204669675469 \hError! Reference source not found. show the current-limiting action of fuses. The available short-circuit current would flow if no fuse were in the circuit or if a noncurrent-limiting protective device were in the circuit. In its current-limiting range, a current-limiting fuse limits the peak current to a value less than the available value; opens in 0.5cycle or less in its current-limiting range; and, therefore, lets through only a portion of the available short-circuit energy. The degree of current limitation is usually represented in the form of peak let-through current charts. Peak let-through current charts Peak let-through current charts (sometimes referred to as current-limiting effect curves) are useful for determining the degree of short-circuit protection that a current-limiting fuse provides to the equipment beyond it. These charts show fuse peak let-through current as a function of available symmetrical rms current, as shown in Figure REF RTF34303535363a204669675469 \hError! Reference source not found.. The straight line running from the lower left to the upper right shows a 2.3 relationship (based on a 15% power factor; see UL248-1-2000 and CSAC22.2 No.248-1-2000) between the peak current that would occur without a current-limiting devise in the circuit and the available symmetrical rms current. Peak let-through current and apparent equivalent rms let-through current can be determined from the let-through current charts and are useful in relating to equipment withstandability. Let-through data may be compared to short-circuit ratings of the fixed components that are static and have a time rating of 0.5cycle or longer at a test circuit power factor of 15% or greater. Examples include wire, cable, and bus. An example showing the application of the let-through current charts is represented in Figure REF RTF32313334323a204669675469 \hError! Reference source not found., where the load-side component is protected by an 800A current-limiting fuse. Example: Determine the fuse let-through current values with 40000A rms symmetrical available at the line side of the fuse. Enter the let-through current chart of Figure REF RTF34303535363a204669675469 \hError! Reference source not found. at an available current of 40000A rms symmetrical, and find a fuse peak let-through current of 38000A and an effective rms current of 16500A. The clearing time is less than 0.5cycle. The load-side circuit components is not subjected to an I2t duty greater than the total clearing let-through I2t of the fuse. Magnetic forces vary with the square of the peak current IP2 and can be severe. These forces can be reduced considerably when current-limiting fuses are used. Maximum clearing I2t I2t is a measure of the energy that a fuse lets through while clearing a fault. Every piece of electrical equipment is limited in its capability to withstand energy. The equipment I2t withstand rating can be compared with maximum clearing I2t values for fuses. These maximum clearing I2t values are available from fuse manufacturers. 9.9 Current-Limiting Circuit Breakers. When using circuit breakers, current- limiting characteristics can be obtained in the following ways: Auxiliary current-limiting fuses are internally mounted in molded-case circuit breakers. These are usually special-purpose fuses designed for breaker application. Current-limiting fuses are used with low-voltage power circuit breakers. The fuses are usually mounted on the drawout circuit breaker or within a separate drawout assembly, or on switchboards or switchgear. Non-fused current-limiting circuit breakers utilize very fast tripping speeds so that the potential high-magnitude fault current is limited during the first half-cycle of fault current, just as is achieved by some classes of current- limiting fuses. The unit operates as a conventional circuit breaker for overload and lower level fault currents. Current-limiting circuit breakers, including those incorporating current-limiting fuses, are intended for applications needing the overload/overcurrent and switching functions of the circuit breaker in systems where available fault current exceeds the rated fault current capabilities of the circuit breaker, or other components of the power distribution system. The current-limiting element used in conjunction with the circuit breaker is designed such that the current limiter operates only in the event of a low-impedance fault (in a power system of high-fault current capacity) to provide protection against high peak fault current for the circuit components, including the circuit breaker and the load-side circuit components. The conventional elements of the circuit breaker will clear the overloads and low-magnitude fault currents, which are the most frequent causes of automatic operation of protective equipment in low-voltage systems. The current-limiting element handles the relatively infrequent high-magnitude fault currents, and operation of any fuse will trip the circuit breaker. Time Delay Fuses See PD Electronic fuses See PD Circuit Breakers Air Circuit Breakers Vaccume Cuircuit Breakers Oil Circuit Breakers Power Circuit Breakers Molded Case Circuit Breakers 5.11 Molded-Case Circuit Breakers Standard designs of molded-case circuit breakers (MCCB) are quick-make and quick-break switching devices with both inverse time and instantaneous trip action. They are encased within rigid, non-metallic housings and vary greatly in size and rating. Standard frames are available with 304000 A current, and 120600 Vac and 125250 Vdc ratings. The smaller breakers are built in one-, two-, or three-pole construction and are sealed units without adjustable instantaneous trips. The larger ratings are usually available in three- or four-pole frames only and have interchangeable and adjustable instantaneous trip units. With modifications and new developments, the manufacturers' catalogs should be consulted to obtain the MCCB best suited for user requirements. The current domestic standards are NEMA AB 1-1986, Molded-Case Circuit Breakers [31] and ANSI/UL 489-1985, Molded-Case Circuit Breakers and Circuit Breaker Enclosures [12]. Requirements With few exceptions, the manufacturing, ratings, and performance requirements are the same for both standards. Typically, MCCBs are submitted for UL witness testing, which is repeated periodically for certification. The required switching tests are conducted sequentially with a set of MCCBs according to a listed schedule. The test samples undergo all tests, which include overload, endurance, and short circuit. Accessories MCCBs are usually operated manually; but solenoids are available for remote tripping and electrical motor operators are available for remote operation with the larger frames. Other attachments are auxiliary contacts for signaling and undervoltage devices to trip the MCCB on reduced system potential. All MCCB designs employ a trip-free mechanism, which prevents injury to an operator who closes a breaker into a fault. The larger frames have ground-fault designs utilizing external current transformers and relays to energize a shunt trip within the MCCB. Application Ambient temperature and system frequency should be considered for all MCCBs. Unlike the power air-type circuit breakers, MCCBs usually require a 20% current de-rating when installed in enclosures. Several manufacturers offer 100% rated MCCBs with 600 A frames and larger. With few exceptions, conventional MCCB designs cannot be coordinated for selectivity. These breakers employ rapid mechanisms that have little inertia, and interrupting times at maximum fault levels are usually one cycle or less. MCCBs employing electronic trip units and current transformers can be applied for selective coordination and their short-time ratings vary with each design. Many of these modern designs have internal ground-fault detection, which improves system protection. 5.11.1 Types of Molded-Case Circuit Breakers These devices are available in the following general types: Thermal Magnetic Employ temperature-sensitive bimetals, which provide inverse or time delayed tripping on overloads, and coils or magnet and armature designs for instantaneous tripping. Magnetic Only Employ only instantaneous tripping and are used in welding or motor circuit application. The NEC [9] recognizes adjustable magnetic types only for motor circuit applications. Integrally Fused Specially designed current-limiting fuses are housed within the molded case for extended short-circuit application in systems with 100 or 200 kA available, and interlocks are provided to ensure that the MCCB trips when any fuse operates. Current Limiting Employs electromagnetic principles to effectively reduce the let-through magnitudes of current and energy (I2t). Their ratings and number of effective operations are available in manufacturers' literature, and the designs are UL listed. However, some designs may be larger in size than typical circuit breakers. High Interrupting Capacity Many manufacturers offer this type for application in systems having high fault currents. They employ stronger, high-temperature molded material, but retain the standard circuit breaker dimensions. 5.11.2 Use of Molded-Case Circuit Breakers Molded-case circuit breakers are suitable in various equipment and installations. 1) Individual enclosures Wall-mounted, dust-resistant NEMA Types 1A and 12 (See ANSI/NEMA ICS6-1988, Enclosures for Industrial Control and Systems [8].) Outdoor, raintight NEMA Type 3 (See ANSI/NEMA ICS6- 1988 [8].) Hazardous NEMA Types 4, 5, 7, and 9 (See ANSI/NEMA ICS6-1988 [8].) 2) In panelboards and distribution switchboards 3) In switchgear having rear-connected, bolt-on, plug-in, or drawout features 4) In combination starters and motor control centers 5) In automatic transfer switches In case (5), molded-case circuit breakers may be used as a part of the automatic transfer switches to serve as service or feeder disconnects and to provide overcurrent protection. They may also be used as part of the automatic transfer switch when found suitable for this particular task and when operated by appropriate mechanisms in response to initiating signals, such as loss of voltage, etc. If MCCBs are used to combine both functions, an external manual operator should be provided for independent disconnections of both the normal and alternate supplies. Particularly in the larger sizes (current ratings), consideration should be given to the anticipated number of operations to which the equipment will be subjected because MCCBs are not designed for highly repetitive duty. Protective Relays 5.5 Principles of protective relay application [B23], [B43], [B65] Fault-protection relaying can be classified into two groups: primary relaying, which should function first in removing faulted equipment from the system, and backup relaying, which functions only when primary relaying fails. To illustrate the areas of protection associated with primary relaying, figure 5-16 shows the various areas, together with circuit breakers, that feed each electric element of the system. Note that it is possible to disconnect any piece of faulted equipment by opening one or more circuit breakers. For example, when a fault occurs on the incoming line Ll, the fault is within a specific area of protection (area A) and should be cleared by the primary relays that operate circuit breakers 1 and 2. Likewise, a fault on bus 1 is within a specific area of protection, area B, and should be cleared by the primary relaying actuating circuit breakers 2, 3, and 4. If circuit breaker 2 fails to open and the faulted equipment remains connected to the system, the backup protection provided by circuit breaker 1 and its relays must be depended upon to clear the fault. Figure 5-16 illustrates the basic principles of primary relaying in which separate areas of protection are established around each system element so that each can be isolated by a separate interrupting device. Any equipment failure occurring within a given area will cause tripping of all circuit breakers supplying power to that area. To assure that all faults within a given zone will operate the relays of that zone, the current transformers associated with that zone should be placed on the line side of each circuit breaker so that the circuit breaker itself is a part of two adjacent zones. This is known as overlapping. Sometimes it is necessary to locate both sets of current transformers on the same side of the circuit breaker. In radial circuits the consequences of this lack of overlap are not usually very serious. For example, a fault at X on the load side of circuit breaker 3 in figure 5-16 could be cleared by the opening of circuit breaker 3 if there were any way to cause it to open circuit breaker 3. Since the fault is between the circuit breaker and the current transformers, the relays of circuit breaker 3 will not see it, and circuit breaker 2 will have to open and consequently interrupt the other load on the bus. When the current transformers are located immediately at the load bushings of the circuit breaker, the amount of circuit exposed to this problem is minimized. The consequences of lack of overlap become more serious in the case of tie circuit breakers between differentially protected buses and bus feeders protected by differential or pilot-wire relaying. In applying relays to industrial systems, safety, simplicity, reliability, maintenance, and the degree of selectivity required should be considered. Before attempting to design a protective relaying plan, the various elements that make up the distribution system, together with the operating requirements, should be examined.  Figure 5-16One-line diagram illustrating zones of protection 5.5.1 Typical small-plant relay systems One of the simplest industrial power systems consists of a single service entrance circuit breaker and one distribution transformer stepping the utility's primary distribution voltage down to utilization voltage, as illustrated in figure 5-17. There would undoubtedly be several circuits on the secondary side of the transformer, protected by either circuit breakers or combination fused switches. Protection for the feeder circuit between the incoming line and the devices on the transformer secondary would normally consist of conventional overcurrent relays, Devices 50/51. Preferably, the relays should have the same timecurrent characteristics as the relays on the utility system, so that for all values of fault current the local service entrance circuit breaker can be  Figure 5-1 7Typical small industrial system programmed to trip before the utility supply line circuit breaker. The phase relays should also have instantaneous elements, Device 50, to promptly clear high-current faults. This simple system provides both primary and backup relay protection. For instance, a fault on a secondary feeder should be cleared by the secondary protective device; however, if this device should fail to trip, the primary relays will trip circuit breaker 1. Where the secondary voltage is 600 V or less, local code authorities may require a main secondary device to be installed to protect the incoming conductors and provide back-up protection to the feeder protective devices. This simple industrial system can be expanded by tapping the primary feeder and providing fuse protection on the primary of each distribution transformer, as shown in figure 5-18. This provides an additional step or area of protection over the simpler system shown in figure 5-17. All secondary feeder faults should be cleared by the secondary overcurrent devices as before, while faults within the transformer should now be cleared by the transformer primary fuses. The fuses may also act as backup protection for the faults that are not cleared by the secondary feeder overcurrent devices. Primary feeder faults will, as before, be cleared by circuit breaker 1, and it, in turn, will act as backup protection for the transformer primary fuses. 5.5.2 Protective relaying for a large industrial plant power system [B63], [B80], [B81] As an electric system becomes larger, the number of sequential steps of relaying also increases, giving rise to the need for a protective relaying scheme that is inherently selective within each zone of protection. Figure 5-19 shows the main connections of a large system.  Figure 5-18System of figure 5-17 expanded by addition of a transformer and associated secondary circuits 5.5.2.1 Primary protection The relay selectivity problem is of great concern to the utilities because their 69 kV supply lines are paralleled and their transformers are connected in parallel with the plant's local generation. The utility company should participate in the selection of relays applied for operation of either incoming circuit breaker in case of a disturbance in the 69 kV bus or transformers. Due to the 69 kV bus tie, a fault in either a bus or a transformer cannot be cleared by the opening of circuit breaker A or B alone, but will require the opening of circuit breakers A or B as well as AB and C or D. When 69 kV tie breaker is open and a fault occurs on utility line 1, fault current will flow from line 2 back through the two industrial supply transformers. Three overcurrent relays having inverse-time characteristics should be installed at circuit breaker positions A and B as backup protection for faults that may occur on or immediately adjacent to the 69 kV buses. The connection of these overcurrent relays (Devices 50/5 1), shown in figure 5-19 as being energized from the output of two current transformers in a summation connection at the incoming 69 kV lines and bus tie, provides the advantage of isolating only the faulted bus section in a shorter time than would be possible if individual circuit breaker relays were used. This is commonly called a partial differential scheme. Three directionally controlled overcurrent relays (Device 67) should be installed for circuit breakers C and D and connected to trip for current flow toward the respective 69 kV transformer. Directionally controlled overcurrent relays are ideal for interrupting this current, since their sensitivity is not limited by the magnitude of load current in the normal or nontrip direction. The next zones of protection are the 13.8 kV buses 1 and 2. Fault currents are relatively high for any equipment failure on or near the main 13.8 kV buses. For this reason a differential protective relay scheme (Device 87B) is recommended for each bus. Differential relaying is instantaneous in operation and is inherently selective within itself. Without such relaying, high-current bus faults should be cleared by proper operation of overcurrent devices on the several sources. This usually results in long-time clearing since the overcurrent devices have pickup and time settings determined by other than bus fault considerations. General practice is to use separate current transformers with the same ratio and output characteristics for the differential relay scheme. A multicontact auxiliary relay (Device 86B) is used with the differential relays to trip all the circuit breakers connected to the bus whenever a bus fault occurs. To realize maximum sensitivity, the time-delay ground relays (Device 51N) at the 6913.8 kV source transformers are connected to the output of current transformers measuring the current in the neutral connection to ground. The 87TN relay is differentially connected to provide sensitive tripping on faults between the transformer secondary and the 13.8 kV main circuit breaker. Auxiliary current transformers will normally be required to provide equal currents to the relay. Unlike the time-delay relays 51N-1 and 51N-2, this relay does not have to be set to be selective with other downstream ground-fault relays. Selective tripping of breakers C and D is achieved by the use of the partial differential relays scheme (Device 51). Superior protection for the cable tie between buses 2 and 3 is provided by pilot-wire differential relays (Device 87L). In addition to being instantaneous in operation, pilot-wire schemes are inherently selective within themselves and require only two pilot wires if the proper relays are used. Backup protection provided by overcurrent relays should be installed at both ends of the tie line. Nondirectional relays can be applied at circuit breaker M, but at circuit breaker N directional relays are more advantageous since the 10 MVA generator represents a fault source at bus 3. Separate current transformers are used for the pilot-wire differential relaying to provide reliability and flexibility in the application of other protective devices. The 9000 hp 13.8 kV synchronous motor is provided with a reactor-type reduced-voltage starting arrangement using metal-clad switchgear. Overload protection is provided by a thermal relay (Device 49) whose sensor is a resistance temperature detector (RTD) imbedded in the stator windings. This relay can be used to either trip or alarm. Internal fault protection is provided by the differential relay scheme (Device 87M). Backup fault protection and locked- rotor protection is provided by an overcurrent relay (Device 5 1/50) applied in all three phases. Undervoltage and reverse-phase rotation protection are provided by the voltage-sensitive relay (Device 47) connected to the main bus potential transformers. Ground-fault protection is provided by the instantaneous zero-sequence current relay (Device 50GS). The current-balance relay (Device 46) protects the motor against damage from excessive rotor heating caused by single phasing or another unbalanced voltage condition. The motor rotor starting winding can be damaged by excessive current due to loss of excita tion or suddenly applied loads, which cause the motor to pull out of step. Rotor damage could also result from excessive time for the motor to reach synchronous speed and lock into step.   Protective device legend for Figure 5-19 Protective device legend for Figure 5-19 (continued) Protective device legend for Figure 5-19 (continued)  To protect against damage from these causes, loss of excitation (Device 40), pull-out (Device 56PO), and incomplete sequence (Device 48) relays should be provided. Multifunction motor protection relays, (Device 11) which combine many of the above functions, e.g., Device 49, 50LR, 50GS, 46, 48, in a single enclosure may be used. These are microprocessor-based devices that provide sensitive levels of protection and are easily programmable to meet the characteristics of the motor. The 10 MVA generator connected to bus 3 is protected against internal faults by a percentage differential relay (Device 87G) and against ground faults by the overcurrent relay in the generator neutral (Device 51NG) where the current is limited by the 400 A neutral grounding resistor. Loss of excitation protection is provided by Device 40, and negative phase sequence protection caused by unbalanced loading or unbalanced fault conditions is provided by Device 46. The generator must also be protected from being driven as a motor (anti- motoring) when the prime mover can be damaged by such operation using a reverse power relay, Device 32. Backup overcurrent protection should be capable of detecting an external fault condition that corresponds to the minimum level of generator contribution with fixed excitation. This can be accomplished by three voltage-restraint or voltage-controlled overcurrent relays, Device 5 1V [B 57]. It is good practice for transformers of the size shown on the incoming service, where a circuit breaker is used on both the primary and secondary sides, to install percentage differential relays and inverse characteristic overcurrent relays for backup protection. To prevent operation of the differential relays on magnetizing inrush current when energizing the transformer, the large proportion of currents at harmonic multiples of the line frequency contained in the magnetizing inrush current are filtered out and passed through the restraint winding so that the current unbalance required to trip is made much greater during the excitation transient than during normal operation. 5.5.2.2 Medium-voltage protection The medium-voltage (2.4 kV) substations shown in figure 5-19 are designed primarily for the purpose of serving the medium- and large-size motors. Buses 2 and 3 fed by the 3750 kVA transformers are connected together by a normally closed tie circuit breaker, which is relayed in combination with each main circuit breaker by means of a partial differential or totalizing relaying scheme (Device 51). The current transformers are connected with the proper polarity so that the relay sees only the total current into its bus zone and does not see any current that circulates into a bus zone through either main and leaves through the tie. The relay backs up the feeder circuit breaker relaying connected to its respective bus or operates on bus faults to trip the tie and appropriate main circuit breakers simultaneously, thereby saving one step of relaying time over what is required when the tie and main circuit breakers are operated by separate relays. One possible disadvantage to this scheme occurs when a directional relay or main circuit breaker malfunctions for a transformer fault or when a bus feeder circuit breaker fails to properly clear a downstream fault. The next device in the system that can clear is the opposite primary feeder circuit breaker. If this occurs, a total loss of service to the substation will result. As a result, additional overcurrent relays (Device 51) are sometimes added to the tie circuit breaker on systems where the possibility of this occurrence cannot be tolerated, although they are not shown on the system in figure 5-19. These relays can be set so as not to extend any other relay operating time, while providing the necessary backup protection to afford proper circuit isolation for faults upstream from either main circuit breaker. The source ground relaying for the double-ended 2.4 kV primary unit substation is similar to that described for the 13.8 kV transformer secondary. The single-ended 1500 kVA 2.4 kV primary unit substation on bus1 illustrates a method for high-resistance grounding utilizing an isolation transformer in the neutral circuit. This scheme limits the magnitude of ground current to a safe level, while permitting the use of a lower voltage rated resistor stack. The remainder of the 2.4 kV relaying shown in figure 5-19 is, in one form or another, provided for protection of the motor loads. The application of a combination motor and transformer as shown connected to the 13.8 kV bus 3 is referred to as the unit method. This is done to take advantage of the lower cost of the motor and the transformer at 2.4 kV, as compared to the motor alone at 13.8 kV. Motor internal fault protection is provided by instantaneous overcurrent relays, arranged to provide differential protection (Device 87M), by the use of zero-sequence (doughnut-type) current transformers located either at the motor terminals or, preferably, in the starter. The latter current transformer location will also afford protection to the cable feeder. Three current transformers and three relays are applied in this form of differential protection. Thermal overload protection is provided by Device 49 using an RTD as the temperature sensor. Surge protection is provided by the surge arrester and capacitor located at the motor terminals, while undervoltage and reverse-phase rotation protection is provided by Device 47 connected to the bus potential transformers. The sudden pressure relay (Device 63) is used for detection of transformer internal faults. Branch circuit phase and ground-fault protection is provided by Devices 51/50 and 50GS, respectively. The 500 hp induction motor served from the 2.4 kV bus 1 is provided with a nonfused class E1 contractor. The maximum fault duty on this 2.4 kV bus is well within the 50 000 kVA interrupting rating of the contractor and, therefore, fuses are not required. Motor overload protection is furnished by the replica-type thermal relay (Device 49) with the instantaneous overcurrent element (Device 50) applied for phase-fault protection. Separate relaying for motor locked-rotor protection is normally not justified on motors of this size. Undervoltage and single-phasing protection is provided for this and the other motors connected to this bus by Device 27, an undervoltage relay, and by Device 60, a negative-sequence voltage relay connected to the bus potential transformers. Due to the essential function of the motors applied on this bus, a high-resistance grounding scheme is utilized. A line-to-ground fault produces a maximum of two amperes as limited by the 1.72 resistor applied in the neutral transformer secondary. A voltage is developed across the overvoltage relay (Device 59N), which initiates an alarm signal to alert operating personnel. The 1250 hp induction motor connected to 2.4 kV bus 2 is provided with a fused class E2 contractor for switching. The R-rated fuse provides protection for high-magnitude faults. Motor overload protection is furnished by a replica-type thermal relay (Device49). Locked- rotor and circuit protection for currents greater than heavy overloads is furnished by Device 51. Protection against single-phasing underload is provided by the current-balance relay (Device 46). Instantaneous ground-fault protection is provided by Device 50GS, which is connected to trip the motor contractor since the ground-fault current is safely limited to 800 A maximum. Undervoltage and reverse-phase rotation protection is provided by Device 47. 5.5.2.3 Low-voltage protection Figure 5-19 illustrates several different types of 480 V unit substation operating modes. Buses 1, 2, and 3, for example, represent a typical low-voltage industrial spot network system that is often used where the size of the system and its importance to the plant operation require the ultimate in service continuity and voltage stability. Multiple sources operating in parallel and properly relayed provide these features. The circuit breakers are provided with solid-state trip devices as the overcurrent protection means. Ground-fault protection is also indicated and would be supplied either as an optional modification to the trip device on the respective circuit breaker, or as a standard zero-sequence relaying scheme on feeder circuits. For tripping of transformer secondary main circuit breakers and protecting the secondary winding, a relay located in the transformer neutral provides another convenient approach. Since the trip devices of the three main circuit breakers supplying 480 V buses 1, 2, and 3 would normally be set identically to provide selectivity with the tie circuit breakers feeding the 3000 A bus and the other 480 V feeder circuit breakers for downstream faults, directional relays should be provided on these circuit breakers. This will permit selective operation between all 480 V feeder circuit breakers and the main circuit breaker during reverse current flow conditions for transformer or primary faults. Directional relays might also be applied to each of the service-tie circuit breakers feeding the 3000 A bus duct so as to provide selective operation between these interrupters for transformer secondary bus faults. To protect the 800 A frame size feeder circuit breakers from the high level of available fault current at secondary buses 1, 2, 3, and 5, current-limiting fuses should be applied in combination with each circuit breaker. Since the tie circuit breaker at bus 5 is normally closed, the main circuit breakers are also provided with directional relays to ensure selective operation between mains for upstream faults. The unit substation feeding 480 V bus 4 is a conventional radial arrangement and, except for the addition of ground-fault protection, the circuit breakers shown are equipped with standard trip devices. Bus 6 is fed from a delta-connected transformer and is provided with a ground- fault detection system with both a visible and an audible signal. The small low-current frame- size circuit breakers at this bus have standard trip devices only and do not require the assistance of current-limiting fuses as a result of the lower fault duty on the load side of the 1000 kVA transformer. 5.5.3 Relaying for an industrial plant with local generation [B59], [B66], [B76], [B77] When additional power is required in a plant that has been generating all its power, and a parallel-operated tie with a utility system is adopted, the entire fault-protection problem should be reviewed, together with circuit breaker interrupting capacities and system component withstand capabilities. In figure 5-20 the following assumptions are made: All circuit breakers in the industrial plant are capable of interrupting the increased short-circuit current. Each plant feeder circuit breaker is equipped with inverse-time or very inverse-time overcurrent relays with instantaneous units. Each of the generators is protected by differential relays and also has external fault backup protection in the form of generator overcurrent relays with voltage-restraint or voltage-controlled overcurrent relays, as well as negative-sequence current relays for protection against excessive internal heating for line-to-line faults. The utility company end of the tie line will be automatically reclosed through synchronizing relays following a trip-out. The utility system neutral is solidly grounded and the neutrals of one or both plant generators will be grounded through resistors. The plant generators are of insufficient capacity to handle the entire plant load; there fore, no power is to be fed back into the utility system under any condition.  Figure 5-20Industrial plant system with local generation Protection at the utility end of the tie line might consist of three distance relays or time over- current relays without instantaneous units. If the distance relays were used, they would be set to operate instantaneously for faults in the tie line up to 10% of the distance from the plant, and with time delay for faults beyond that point in order to allow one step of instantaneous relaying in the plant on heavy faults. If time overcurrent relays were used, they would be set to coordinate with the time delay and instantaneous relays at the plant. At the industrial plant end of the tie at circuit breaker 1, there should be a set of directional overcurrent relays for faults on the tie line, or reverse power relaying to detect and trip for energy flow to other loads on the utility system should the utility circuit breaker open, or both. The directional overcurrent relays are designed for optimum performance during fault conditions. The tap and time dial should be set to ensure operation within the short-circuit capability of the plant generation, and also to be selective to the extent possible with other fault-clearing devices on the utility system. The reverse power or power directional relay is designed to provide maximum sensitivity for flow of energy into the utility system where coordination with the utility protective devices is not a requisite of proper performance. A sensitive tap setting can be used, although a small time delay is required to prevent nuisance tripping that may occur from load swings during synchronizing. Due to this time delay a reverse power relay trip of circuit breaker 1 alone may be too slow to prevent generator overload in the event of loss of the utility power source. Further, the amount of power flowing out to the other utility loads may not at all times be sufficient to ensure relay pickup. A complete loss of the plant load can only be prevented by early detection of generator frequency decay to immediately trip not only circuit breaker 1, but also sufficient nonessential plant load so that the remaining load is within the generation capability. An underfrequency relay to initiate the automatic load shedding action is considered essential protection for this system. For larger systems, two or more underfrequency relays may be set to operate at successively lower frequencies. The nonessential loads could thereby be tripped off in steps, depending on the load demand on the system. The proposed relay protection for a tie line between a utility system and an industrial plant with local generation should be thoroughly discussed with the utility to ensure that the interests of each are fully protected. Automatic reclosing of the utility circuit breaker with little or no delay following a trip-out is usually normal on overhead lines serving more than one customer. To protect against the possibility of the two systems being out of synchronism at the time of reclosure, the incoming line circuit breaker l can be transfer-tripped when the utility circuit breaker trips. The synchro-check relaying at the utility end will receive a dead-line signal and allow the automatic reclosing cycle to be completed. Reconnection of the plant system with the utility supply can then be accomplished by normal synchronizing procedures. Generator external-fault protective relays, usually of the voltage-restraint or voltage- controlled overcurrent type, and negative-sequence current relays provide primary protection in case of bus faults and backup protection for feeder or tie line faults. These generator relays will also operate as backup protection to the differential relays in the event of internal generator faults, provided there are other sources of power to feed fault current into the generator. General discussion of a protective system Power systems should be designed so that protective relays operate to sense and isolate faults quickly to limit the extent and duration of service interruptions. Protective relays are important in industrial power systems because they can prevent large losses of production due to unnecessary equipment outages or unnecessary equipment damage occurring as a result of a fault or overload. Other considerations are safety, property losses, and replacements. Protective relays have been called the watchdogs or silent sentinels of a power system. Protective relays are classified by the variable they monitor or by the function they perform. For instance, an overcurrent relay senses current and operates when the current exceeds a predetermined value. Another example is a thermal overload relay that senses the temperature of a system component, either directly or indirectly (as a function of current), or both, and operates when the temperature is above a rated value. The application of relays is often called an art rather than a science because judgment is involved in making selections. The selection of protective relays requires compromises between conflicting objectives, while maintaining the capability of operating properly for several system operating conditions. These compromises include providing Maximum protection Minimum equipment cost Reliable protection Highspeed operation Simple designs High sensitivity to faults Insensitivity to normal load currents Selectivity in isolating a minimum portion of the system Planning for the protection system should be considered in the power system design stage to ensure that a good system can be implemented. The cost of applying protective relays should be balanced against the potential costs of not providing protection. Electromechanical relays have been used for over 60 years to provide power system protection. They are known for their reliability, low maintenance, and long life of operation. However, since the early 1960s, static relays have been used in an increasing number of applications. Static relays provide the advantages of lower burden, improved dynamic performance characteristics, high seismic withstand capability, self-monitoring, multifunctionality, system monitoring, and reduced panel space requirements. Many of the protection functions can be accomplished equally well by either electromechanical or static relays. The specific application should dictate which type of relay is used. The various protective relay functions have been given identifying device function numbers, with appropriate suffix letters when necessary. All of these numbers are listed in IEEEStdC37.21996 and are used in diagrams, instruction books, and specifications. Many possible numbers can be used; but, for convenience, only the ones most commonly used are listed in Table REF RTF32313936393a205461626c65 \hAbbreviated list of commonly used relay device function numbers, along with the function that each number represents. Abbreviated list of commonly used relay device function numbersRelay device functionnumberProtection function21Distance25Synchronizing27Undervoltage32Directional power40Loss of excitation (field)46Phase balance (current balance, negative-sequence current)47Phasesequence voltage (reverse phase voltage)49Thermal (generally thermal overload)50Instantaneous overcurrent51Time-overcurrent59Overvoltage60Voltage balance (between two circuits)67Directional overcurrent81Frequency (under and overfrequency)86Lockout87Differential Table REF RTF34313735303a205461626c65 \hCommonly used suffix letters applied to relay function numbers lists the commonly used suffix letters applied to each number denoting the circuit element being protected or the application. Each of the relay types listed in Table REF RTF32313936393a205461626c65 \hAbbreviated list of commonly used relay device function numbers is discussed in some detail in this chapter, along with their operating principles and applications. Commonly used suffix letters applied to relay function numbersSuffix letterRelay applicationa AAlarm onlyBBus protectionGGroundfault protection [relay current transformer (CT) in a system neutral circuit] or generator protectionGSGroundfault protection (relay CT is toroidal or ground sensor)LLine protectionMMotor protectionNGround-fault protection (relay coil connected in residual CT circuit)TTransformer protectionVVoltageaExamples: (1) 87T, transformer differential relay (2) 51G, time-overcurrent relay used for ground-fault protection (3) 49M, motor winding overload (or over-temperature) relay (4) 87B, bus differential relay or partial bus differential relay (also called summation differential) Zones of protection A separate zone of protection is normally established around each system element. This practice logically divides the system into protective zones for generators, transformers, buses, transmission lines, distribution lines or cable circuits, and motors. Any failure occurring within a protection zone sends a trip signal to circuit breakers serving that zone to isolate the faulted equipment from the rest of the system. Protection zones are classified as primary and/or backup. The primary protective relays are the first line of defense against system faults and operate first to isolate the fault. Typically, high-speed relays (i.e., 1cycle to 3cycles exclusive of breaker operating time) with high drop-out rates are applied in these applications. When a fault is not isolated after some time delay, backup protection clears the faulted equipment by retripping the primary circuit breakers or by tripping circuit breakers in adjacent zones. When adjacent zones are tripped by backup protective relays, more of the power system is removed from service. Backup protection can be either local or remote. Local backup protection is located within the zone in which the fault occurs, and trips either the primary circuit breaker or circuit breakers in adjacent zones. Remote backup protection is located in adjacent zones and generally only trips circuit breakers in their zone. The protection zones generally overlap to ensure no portion of the power system is left unprotected. Also, primary and backup protection systems should be selectively coordinated by current magnitude, time, fault type, direction, temperature, etc. Fundamental operating principles Protective relays generally operate in response to one or more electrical quantities to open or close contacts or to trigger thyristors. (An exception is a thermal relay, which operates in response to temperature levels.) Relays are constructed using either electromechanical or static principles. Electromechanical relay operating principle Electromechanical relays have only two operating principles: Electromagnetic attraction Electromagnetic induction Electromagnetic attraction relays operate by having either a plunger drawn by a solenoid or an armature drawn to a pole of an electromagnet. This type of relay operates from either an ac or a dc current or voltage source and is used for instantaneous or highspeed tripping. Electromagnetic induction relays use the principle of the induction motor, where torque is developed by induction into a rotor. This principle is used in an electromechanical watthour meter, where the rotor is a disk. The actuating force developed on the rotor is a result of the interaction of the electromagnetic fluxes applied and the flux produced by eddy currents that are induced in the rotor. Induction relays can only be used in ac applications, and the rotor is normally a disk or a cylinder. Time-overcurrent, time-undervoltage, and time-overvoltage relays commonly are of the disk design, while cup (cylinder) structures are often found in highspeed overcurrent, directional, differential, and distance relays. Static relay operating principle Static relays are either analog or digital. Static analog relays were first introduced in the early 1960s and were typically designed to emulate the characteristics of their electromechanical counterparts. Soon, digital technology was implemented in relay design with characteristics available that were outside the capabilities of the electromechanical design. Operation of the static design converts input signals to an appropriate magnitude for measurement within the relay, which is in direct proportion to the system signal. The measured value is then compared against a predetermined setting. Timing and other characteristics are derived from either the analog circuit design or algorithms within a microprocessor. Functional descriptionapplication and principles Distance relay (Device 21) Application Distance relays are widely used for primary and backup protection on subtransmission and transmission lines where highspeed relaying is desired, normally on circuits having voltages above 34.5kV. Other applications include generator backup protection for faults on the system and startup of large motors with high inertia (see Chapter 10). Operation principles Distance relay is a generic term applied to impedance relays that use voltage and current inputs to provide an output signal if a fault is within a predetermined distance from the relay location. Distance to the fault is calculated from the voltagetocurrent ratio as a measure of impedance, from the imaginary component of the voltagetocurrent ratio as a measure of reactance, or from the currenttovoltage ratio as a measure of the admittance. The major advantage of a distance relay is that it responds to system impedance instead of the magnitude of current. Thus, the distance relay has a fixed distance reach as contrasted with overcurrent relays for which the reach varies as shortcircuit levels and system configurations change. Electromechanical distance relays utilize an induction cup construction to achieve operating times of 1cycle to 1.5cycles. Static distance relays have an inherent operating time of 0.25cycle to 0.5cycle. A fixed time delay is added when required for selectivity. Distance relay characteristics can be shown graphically in terms of two variables, R and X (or Z and q), where R is the resistance, X is the reactance, Z is the impedance, and q is the angle by which current lags voltage. The relay characteristics and the line impedance can be plotted on the same RX diagram for analysis. In examining RX diagrams, it should be recalled that regions of positive R and X represent impedances in a defined tripping direction, while the third quadrant (negative R and X) contain impedance behind the relay, or in the nontripping direction. The origin of the RX diagram is placed at the relay location, which is defined by the location of its CTs and voltage transformers (VTs). Reactance distance relay Reactance relays measure the reactive component of system complex impedance. A generic reactance relay characteristic appears on the RX diagram as a straight line parallel to the Raxis, as shown in Figure REF RTF32303730373a204669675469 \hError! Reference source not found. . Operation of the generic reactance relay occurs when the reactance from the relay to the point of fault, X2 in Figure REF RTF32303730373a204669675469 \hError! Reference source not found. , is less than or equal to the reactance X1. Reactance X1 is the reactance setting of the relay. The relay also responds to any reactance in the negative direction. Reactance relays are inherently nondirectional. Operation is practically unaffected by arc resistance, but reactance relays may operate on load current and hence should be used in conjunction with other relays to restrict their reach along the Raxis and in the reverse, negative-reactance direction. Impedance distance relay The impedance relay measures the magnitude of the complex impedance. The generic impedance relay characteristic is a circle on the RX diagram as shown in Figure REF RTF31333634343a204669675469 \hError! Reference source not found.. Operation of the generic impedance relay occurs when the resistance and reactance (impedance) from the relay to the point of fault, Z2 = R2 + JX2 in Figure REF RTF31333634343a204669675469 \hError! Reference source not found. , lies within the circle having radius , impedance Z1 = R1 + JX1, is the setting on the relay. To make the impedance relay directional, the generic impedance relay should be used in conjunction with other relays to restrict their reach in the reverse direction (i.e., third quadrant of the RX diagram). Mho distance relay An mho relay measures complex admittance, but unlike impedance relays, mho relays are directional. The mho distance relay has a circular characteristic, as shown in Figure REF RTF33303132393a204669675469 \hError! Reference source not found.. Relay operation occurs when the impedance from the relay to the fault, Z2 = R2 + JX2 in Figure REF RTF33303132393a204669675469 \hError! Reference source not found. , lies inside the mho characteristic. Because the circular characteristic falls mainly in the first quadrant of the RX diagram, the mho relay is directional. For special applications, a mho characteristic may be shifted in either forward or reverse directions. For loss of field applications (see  REF RTF31383236363a2048332c312e \hLoss-of-excitation relay (Device 40)), the mho relay characteristic is centered on the Xaxis, with its center offset in the negative direction from the R-axis, as shown in Figure REF RTF33323537363a204669672054 \hError! Reference source not found.. Mhosupervised reactance relay characteristic For applications on short lines, a composite consisting of an ohm (reactance) unit and a mho unit in one case is often used. The mho unit, called the starting unit, provides a directional function. The tripping contacts of the mho unit and ohm unit are in series so that relay tripping is confined to the areas where both characteristics overlap (see Figure REF RTF32333634363a204669672054 \hError! Reference source not found.). A trip signal occurs if the reactance from the relay to the point of fault is less than or equal to X1 and the impedance from the relay to the fault is within the mho characteristic. Directional impedance relay characteristic One type of directional impedance relay that is sometimes used is shown in Figure REF RTF31393333353a204669675469 \hError! Reference source not found.. The origin of the relays circular characteristic is shifted into the first quadrant, and a directional element is added. Breaker tripping occurs when the impedance between the relay and the fault is within the relays unshaded circular characteristic. Many other characteristic shapes have been used over the past several years. Many of these shapes are known by the name of the item that they resemble (e.g., ice cream cone, tomato). Each of these various characteristics were developed to more closely match the characteristics of the line to eliminate unwanted operations. Synchronism check and synchronizing relays (Device 25) Application Synchronism check and automatic synchronizing relays are applied when two or more sources of power are to be connected to a common bus (see Figure REF RTF34303232303a204669672054 \hError! Reference source not found. and Figure REF RTF33303531323a204669672054 \hError! Reference source not found. ). The success of connecting two sources together depends largely upon securing small and preferably diminishing differences in the voltage magnitudes, phase angles, and frequencies of the two sources at the time they are to be connected together. Synchronism check (also called sync-check or syncroverifier) relays permit automatic or manual closing of a circuit breaker or switches only when the systems on each side of the devices are within the setting criteria of the relay (see Figure REF RTF34303232303a204669672054 \hError! Reference source not found.). Sync-check relays are typically applied for supervision of manual closing on small generators, as backup protection for automatic synchronizing of larger generators, and at locations where the system may become separated and loss of synchronism between the two resulting systems may occur. Automatic synchronizing relays may be used to automatically close or supervise the closing of a circuit breaker whose function is to connect a generator to a system or to connect two separate systems (see Figure REF RTF33303531323a204669672054 \hError! Reference source not found.). The same automatic synchronizing relay may be used to control more than one circuit breaker at a station by switching the relay wiring to the potential and control circuits of the unit being synchronized. Manual synchronization requires training, use of good judgment, experience, and the careful attention of the operator. Switchgear and generating equipment have been damaged as a result of misjudgment by an operator. Bent shafts of industrial-size turbine generators occur all too often when operators close circuit breakers when the systems are too far out of phase. Therefore, manual synchronizing is not recommended unless it is supervised with a relay that performs a synchronizing verification. Synchronism check (sync-check) relays Recommended practice promotes the use of a sync-check relay as a permissive device to supervise manual or automatic closing of a circuit breaker or switch between two systems. In this scheme, as shown in Figure REF RTF34303232303a204669672054 \hError! Reference source not found., a normally open contact of a sync-check relay in series with the circuit breakers or switchs closing circuit prohibits the closing of the device when system conditions are outside the setting criteria of the relay and minimizes the risk of equipment damage. Relay supervision of manual synchronism is accomplished in the following way: The operator performs all the normal manual synchronizing functions, but cannot complete the circuit breaker close circuit until the relay senses that the systems are in synchronism. When the operator is satisfied that the systems are in synchronism, the devices closing switch is operated to connect the two sources together. The relay monitors the voltages on each side of the device; and when the phase-angle and voltage difference between the two systems are within the preset values for a defined period, the relays normally open contact closes and allows closure of the device. The period, which is adjustable on the relay, defines the allowable system slip rate. The shorter the period, the higher the slip rate allowed. High slip rates or a late closing signal could permit the sources to be connected at an angle greater than the desired closing angle. This situation can lead to possible equipment damage because the system may be out of synchronism by the time the device actually closes its contacts. Therefore, a longer period is normally used to require a lower slip rate between the two systems. Sync-check relays are available with fixed and adjustable closing angles. Adjustable closing angles are typically set between 10 and 30 and are centered around 0 phase angle (i.e., a phase-angle setting of 20 would produce a total window of 40 centered about zero). However, static synch-check relays are available, which provide dynamic phase-angle window settings. In this case (Figure REF RTF33343931343a204669672054 \hError! Reference source not found.), the phase angle can be selected from one of four options: Phase-angle window only on the fast side Phase-angle window only on the slow side Phase-angle window on either side with the window dynamically changing based on the rotational direction of the synchroscope needle The traditional method with the total phase-angle window centered about zero, regardless of rotational direction Limiting the phase-angle window to only one side of the synchroscope limits the possible damage caused as the result of a slow-closing device receiving a close signal just prior to exiting the trailing edge of the window. For example, in Figure REF RTF33333734313a204669672054 \hError! Reference source not found., the phase-angle setting is 20 with a time-delay setting of 1.388s. These parameters provide for a slip setting of 0.08Hz, derived as follows: T = 40 60s/min 360 4.8rpm T = 1.388 where Slip (Hz) = Cycle/s = Rev/s  Slip 60 = rpm (rev/min) Assuming 0.08 Hz slip, rpm = 0.08 60 = 4.8 and  Therefore,   These settings mean that the two systems should be no further than 20 apart with a slip of not more than 0.08Hz. Sync-check relays can also be programmed to provide automatic closing under certain conditions. Most sync-check relays have the capability of providing automatic closing when one or more of the following conditions occur: Live line/dead bus Dead line/live bus Live line/live bus Dead line/dead bus If any of these condition switches are selected, and that condition occurs, the relay provides a close signal without the function of synchronism verification. These condition switches allow greater system flexibility to regain load quickly where no danger exists in closing without synchronization. Care should be taken when selecting these condition switches to ensure that proper synchronization is applied elsewhere when a dead line or bus is automatically energized. Automatic synchronizing relays An automatic synchronizing relay is used for synchronizing an incoming generator to a power system. Automatic synchronizing is applied to generating equipment where the station is unattended; where the element of human error should be ruled out in the startup procedures of a generating unit; or where consistent, accurate, and rapid synchronization is preferred. The relays used are multifunctional devices that sense the differences in phase angle, voltage magnitude, and frequency of the sources on both sides of an incoming generator breaker and initiate corrective signals to the prime mover and field in order to adjust the generator frequency and voltage until the systems are in synchronism. Most automatic synchronizing relays can anticipate an advance angle at which to initiate breaker closing so that, when the circuit breaker is closed, the systems are as close to exact synchronism as possible. A synchroscope is used to monitor the synchronizing process. From the time the relay initiates a close signal until the breakers contacts actually close, the needle travels a certain distance (measured in degrees) around the scope. The distance traveled can be determined based on the speed of rotation and how long it was permitted to rotate. The scopes needle rotates at a speed that is directly proportional to the slip frequency between the generator and the system. Therefore, given the circuit breakers closing time and the desired slip rate, the rotational distance traveled (or advance closing angle) can be determined. When the generator is to be connected to the system, the appropriate synchronizing switch is selected and closed. The synchronizing equipment performs the following functions automatically: A speed-matching relay element senses the frequency difference between the sources and adjusts the governor with raise or lower signals to control the speed of the incoming generator and thereby matches the frequency of the generator with the frequency of the running system bus. A voltage-matching relay element compares the running system and incoming generator voltages and provides raise or lower signals to the excitation system of the incoming generator so that its voltage matches the running system voltage. As the phase angle between the two systems approaches zero, the relay energizes the circuit breaker's closing circuit at an advance angle determined by the relay so that when the circuit breaker contacts close, the two systems are in synchronism. The synchronizing relay itself has at least two adjustable settings that should be made for correct performance. One adjustment permits the relay to accommodate breaker closing time, for example, 0.05s to 0.4s, and one adjustment sets the maximum phase-angle advance, from 0 to 3040. The advance closing angle is calculated by the following expression: q = 360(st) where q is advance angle (), s is slip frequency (cycles/s), t is breaker closing time (s). For example, for systems coming into synchronism rapidly, that is, s = 0.5cycles/s, the closing circuit should be energized well in advance of synchronism. If the circuit breaker has a 0.15s closing time, the advance angle required would be 27. If the slip frequency is much lower, then the advance angle is much smaller. For a 0.1cycle/s slip frequency, the closing angle is now 5.4. Thus, precise control of the point of synchronism can be obtained. Several different schemes for automatic synchronizing can be developed depending on economics, reliability, and operating system requirements. By using electromagnetic relays, several relays are required to perform all functions. Static relays provide all the functions in one unit. Undervoltage relays (Device 27) Application An undervoltage relay is calibrated on decreasing voltage to close a set of contacts at a specified voltage. The typical uses for this relay function include Bus undervoltage protection. The undervoltage relay may either alarm or trip voltage-sensitive loads, such as induction motors, whenever the line voltage drops below the calibrated setting. A time-delay relay is normally used to enable it to ride through momentary sags and thus prevent nuisance operation. For electromechanical relays, to prevent the inertia (or overtravel) of the time-delay relay from tripping the circuit, an instantaneous undervoltage relay with its contacts connected in series with the time undervoltage relay contacts may also be used to provide a fast reset time. Source transfer scheme. The undervoltage relay is used to initiate the transfer and, when desired, retransfer of a load from its normal source to a standby or emergency power source. Due to the possibility of a motor load, this relay has a time delay in order to preclude outofsynchronism closures. Permissive functions. An instantaneous undervoltage relay is used as a permissive device to initiate or block certain action when the voltage falls below the dropout setting. Backup functions. A time-undervoltage relay may be used as a backup device following the failure of other devices to operate properly. For example, a long time-delay relay may be used to trip an isolated generator and its auxiliaries if the primary protective devices fail to do so. Timing applications. A time-undervoltage relay can be used to insert a precise amount of time delay in an operating sequence. Certain protective functions, such as a negative-sequence overvoltage relay, may require a time delay to prevent nuisance tripping. Operation principles Undervoltage relays may be either electromechanical or static. Electromechanical design Time-undervoltage relays of the electromechanical design generally use the induction disk principle. When the applied voltage is above the pickup, the normally closed contacts open and are maintained open as long as the voltage remains above the dropout voltage. When the voltage is reduced to the dropout value and below, the relay contacts begin to close. The operating time is inversely related to the applied voltage, and several ranges of time delay are available. Typical operating characteristics are shown in Figure REF RTF32303933383a204669675469 \hError! Reference source not found.. Frequency-compensated models are available that maintain constant operating characteristics over a specified range of frequency variation. Instantaneous undervoltage relays of the electromechanical design are built in two basic types. The first is a highspeed cylinder design that has a dropout time of less than 1.5 cycles and a dropout voltage that can be accurately set over a wide calibration range. In a three-phase design, the relay may also respond to a reverse phase-sequence condition. The second type consists of a dc hingedarmature telephone relay rectified by a fullwave bridge for ac operation. A Zener diode provides for an accurate operating point, the value of which is determined by a rheostat. The dropout voltage is adjustable over a specified range, and the operating time is approximately 1cycle at 0V. AC electromechanical hinged-armature relays cannot generally be used as undervoltage relays because they would have to remain continuously picked up when voltage is nominal. AC relays operated in this fashion would attempt to drop out every halfcycle (at voltage 0), and the resulting vibration could cause early relay fatigue failure. The voltage setting for time-delay electromechanical relays is typically adjustable by discrete taps over a specified range. Various tap ranges are available depending on the application. The operating time is adjustable by a time-dial setting. In the induction disk design, it is continuously adjustable. Several ranges of time delay are available. The operating time is specified at zero applied voltage when set on the maximum time-dial setting. Instantaneous relays have dropout settings that are adjustable over a specified voltage range depending on the application. The method of adjustment varies depending on the construction of the relay. Static design Time-undervoltage relays of the static design provide similar inverse time-operating characteristics as the electromechanical design. Definite time characteristic timing is also available with static relay designs. When the applied voltage is above the pickup (in the de-energized position), a normally open contact is open and remains open as long as the voltage remains above the pickup setting. When the voltage falls below the pickup setting, the relay begins its timing operation. When the time delay has elapsed, based on the time-voltage operating characteristic, the output contacts close. Similar to the electromechanical design, the operating time is inversely related to the applied voltage with several ranges of time delay available. The typical operating characteristics shown in Figure REF RTF32303933383a204669675469 \hError! Reference source not found. also apply to the static design. These relays are also frequency compensated and are capable of withstanding high levels of seismic stress without malfunction. Voltage settings of static relays vary by manufacturer. They may be adjustable by discrete taps or continuously over a specified range. Various tap ranges may also be available for various applications. The operating time is adjustable by either a time-dial or definite time setting. The definite time setting is typically in units of cycles or seconds. Directional-power relay (Device 32) Application As the name implies, a directional-power relay functions when the real power component (watts) flow in a circuit exceeds a preset level in a specified direction. Typical uses for this relay function include Source power flow control. On systems having inplant generation operating in parallel with the utility supply, a reverse-power relay sensing the incoming power from the utility can be set to detect (and alarm or trip) when the generator begins to supply power to the utility company. Plants designed to sell surplus power to the utility would not use a reverse-power relay for this purpose, unless it was blocked by an under-frequency relay. Antimotoring of generators. This relay is used to detect the motoring power into a generator that has not been disconnected from the system following a shutdown of its driver. See Chapter 11 for further information. Reverse power flow. A sensitive highspeed relay can be used to detect linetoground faults on the delta side of a transformer bank (see the examples in Figure REF RTF33363430353a204669675469 \hError! Reference source not found. and Figure REF RTF31323330323a204669675469 \hError! Reference source not found. ) by detecting the inphase component of the transformer magnetizing current. This occurs when another relay in the system trips the transformers primary breaker and the transformer is energized through its secondary circuit. In applying this relay, the relay operation should be delayed to prevent undesired operations resulting from generator swings relative to the utility. The relay only need be fast enough to permit a successful reclosure from the remote end of the line. Operation principles Directional-power relays may be either electromechanical or static. Electromechanical design Electromechanical units are available in three types: A singlephase induction cup power directional unit with or without an auxiliary timing element A singlephase induction disk power directional element that provides an inherent time delay A polyphase directional unit consisting of three induction disk elements on a common vertical shaft Maximum torque on the relay element occurs when the relay current is at a designated angle relative to relay voltage; the maximum torque angle depends on the relay design. The relay is connected to the VTs and CTs so the maximum relay torque occurs at unity power factor of the load in the designated tripping direction. Figure REF RTF33323339333a204669675469 \hError! Reference source not found. shows the proper connection for a directional-power relay having a maximum torque angle of 90. Static design Static directional-power relays are also designed in single- and three-phase versions. Although a static relay does not develop rotational torque, the operating characteristics typically replicate that of the electromechanical design with the function of maximum relay torque occurring at unity power factor of the load in the designated tripping direction. Some designs have the capability of adjusting for different angles of maximum torque. Loss-of-excitation relay (Device 40) Application The loss-of-excitation relay is used to protect a synchronous motor or generator against damage due to loss of excitation. Loss of excitation or severely reduced excitation can cause generator heating, large voltage drops, and unstable operation. In severe cases, loss of synchronism can occur. Common protection used for smaller motors consist of two types: An instantaneous dc undercurrent relay that monitors field current A relay that monitors the relative angle between voltage and current and thereby responds to power factor On large synchronous motors (normally above 2200kW) and most generators, an impedance-measuring or var-measuring relay operating from current and voltage at the machine stator terminals is used. The distance unit has either an impedance or mho characteristic. When excitation to the generator is lost, the apparent impedance seen by the relay traces a path into the relays tripping zone. See Figure REF RTF33323537363a204669672054 \hError! Reference source not found. for the type of mho unit characteristic used for protection of a generator. Additional discussion is given in Chapter 12. The var relay provides an operating characteristic that is plotted in the complex power plane as shown in Figure REF RTF32373232383a204669675469 \hError! Reference source not found.. The characteristic is represented by a line that is shifted 8 from the horizontal axis. When converted to the impedance plane, this characteristic provides a mho characteristic that has its diameter shifted 8 from the X axis as shown in Figure REF RTF32373538303a204669675469 \hError! Reference source not found. . The relay is set in per-unit rated vars of the generator so that the characteristic falls above the steady state stability limit. Construction The undercurrent relay is a dc polarized relay or a highly sensitive DArsonval contactmaking dc millivoltmeter. The power factor relay is static. The impedance-measuring relay is an induction cylinder unit having directional characteristics. The var relay is also of static design. Phase balance current relay (Device 46) Application Phase balance relays provide motor or generator protection against unbalanced phase currents. Unbalanced currents are caused by An open fuse or conductor in a motor branch circuit or in the primary of a deltawye-connected transformer serving a group of motors, Unbalanced load conditions, or Singlephase switching in the distribution and transmission systems. Two types of phase balance relays are normally applied: current balance and negative-sequence overcurrent. The current balance relay operates when the difference in the magnitude of root-mean-square (rms) currents in two phases exceeds a given percentage value. The negative-sequence current relay operates on magnitude of negative-sequence current, but is set in terms of I22t, the thermal energy produced by this current. In order to set the negative-sequence relay, the I22t characteristic (or K factor) of the machine should be specified. Operation principles for a current balance relay Electromechanical design The electromechanical relay consists of two or three induction disk elements, each having two current coils, as shown in View(a) and View(b) of Figure REF RTF33313933353a204669675469 \hError! Reference source not found.. These coils are connected to different phases so that a closing torque is produced on the disk that is proportional to the difference or unbalance between the currents in the two phases. The amount of unbalance current required to close the contacts may be a fixed percentage, typically 25%, or it may be a variable percentage, as shown by the operating characteristic in Figure REF RTF31393138343a204669675469 \hError! Reference source not found.. Static design The static relay is designed as an individual unit for motor or generator protection or may be a part of an ac motor protective device that has several protective functions within the same unit. The relay determines the difference between line currents and trips when the difference exceeds a preset percentage of fullload current or when the difference exceeds a preset ampere value (depending on the relay manufacturer). Tripping time is either inversely proportional to the phase unbalance current or definite time. Operation principles of a negative-sequence relay Electromechanical design The electromechanical relay consists of an induction disk overcurrent relay and a negative-sequence filter so that the relay responds only to negative-sequence currents. The relay characteristics are extremely inverse, which provide essentially a constant I22t line. The typical operating characteristic is shown in Figure REF RTF33323735373a204669675469 \hError! Reference source not found.. Static design The static relay performs similarly to the electromechanical design. A typical connection diagram is shown in View(c) of Figure REF RTF33313933353a204669675469 \hError! Reference source not found.. This relay typically provides two set points, which allows an alarm signal at a sensitive, pretrip value of I22t in addition to the trip setting. Figure REF RTF33323735373a204669675469 \hError! Reference source not found. shows typical characteristics of this relay. Phase-sequence voltage relay (Device 47) Application The phase-sequence relays are used to protect ac machines from undervoltage and to prevent starting on open or reverse phase sequence. Phase-sequence relays may also provide overvoltage protection. Some phase-sequence relays do not give singlephase protection once the motor is running because the dynamic action of the motor supports the open phase voltage at or near its rated value. Often, a phase-sequence relay monitors the bus voltage and thus protects a group of motors. Operation principles The electromechanical version is an induction disk polyphase voltage relay. All units normally have an undervoltage pickup tap setting; some units are also available with time-dial and overvoltage tap settings. Operating time is inversely related to applied voltage. Machine or transformer thermal relay (Device 49) Application Thermal relays are used to protect motors, generators, and transformers from damage due to excessive longterm overloads. Operation principles Three types of thermal relays are available: Replica temperature relays, operating from CTs Bridge relays, operating from resistance temperature detectors (RTDs) located in the protected equipment A combination relay, operating from a current signal biased by an RTD signal Replica temperature relays usually consist of a coiled thermostatic metal spring mounted on a shaft and a heater element that monitors the output of a CT in a power circuit. The characteristics of the heater element and metal spring approximate the heating curve of the machine or transformer. These relays may or may not be ambient compensated. This type of thermal relay is normally applied to small (less than 1100kW) motors where motor RTDs are not generally included in the protected motor. However, if the motor is important, a more complex protection scheme, discussed in Chapter 10, should be used. Bridge temperature relays operate on the Wheatstone bridge principle using an RTD as a sensor to precisely measure the temperature in a certain part of a motor or generator stator. This relay may be applied to larger, more important motors, generators, and transformers where monitoring the actual temperature in the windings is desirable. Static thermal relays, some using microprocessor technology, also generate the motor heating curves. In some cases, the heating curves are modified by inputs from winding RTDs; this provides precise protection for motors and combines the best features of both relay types. The relay is available either as an individual module or combined with other functions to provide complete motor protection in a multifunction module. See Chapter10 on motor protection for more details. Time-overcurrent and instantaneous overcurrent relays (Device50, Device51, Device50/51, and Device51V) Application By far, the most commonly used protective relays are the time-overcurrent and instantaneous overcurrent relays. They are used as both primary and backup protective devices and are applied in every protective zone in the system. Specific application information can be found in Chapter8 through Chapter15, which describe the protection of major system components. The time-overcurrent relay is selected to give a desired time-delay tripping characteristic versus applied current, whereas instantaneous overcurrent relays are selected to provide highspeed tripping. The instantaneous unit may be applied by itself or included in the same enclosure as the time-overcurrent relay. For electromechanical relays, this is referred to as an instantaneous trip attachment. Time-delay overcurrent relay The most commonly used time-delay relays for system protection use the induction disk principle. Using the same principle as ac watthour meters, when applied to relay design, it provides many varieties of time-current characteristics. Electromechanical design The principal component parts of an electromechanical induction disk overcurrent relay are shown in Figure REF RTF31303233343a204669675469 \hError! Reference source not found.. The elements of an induction disk relay are shown in Figure REF RTF33383639323a204669675469 \hError! Reference source not found.. The disk is mounted on a rotating shaft, restrained by a spring. The moving contact is fastened to the shaft. The operating torque on the disk is produced by an electromagnet having a main (or operating current) coil and a lag coil, which produce the outofphase magnetic flux. A damping magnet provides restraint after the disk starts to move and contributes to the desired time characteristic. Two adjustments exist: the pickup current tap and the time dial. The pickup current is determined by a series of discrete taps that are furnished in several current ranges. The time-dial setting determines the initial position of the moving contact when the coil current is less than the tap setting. Its setting controls the time necessary for the relay to close its contact. A relay constructed on these principles has an inverse time characteristic. As a result, the relay operates slowly on small values of current above the tap setting. As the current increases, the time of operation decreases. When the primary current is above the knee of the CT saturation curve, the secondary current becomes less proportional to the primary current. The effect is further complicated when the relay magnetic circuit also saturates; thus, the time delay remains constant as a result. Different time-current curves can be obtained by modifications of electromagnetic design; some of these typical curves are shown in Figure REF RTF34303334333a204669675469 \hError! Reference source not found.. An auxiliary sealin relay is incorporated into the relay case to lighten the currentcarrying duty of the moving contact. It also operates the target indicator. An inherent characteristic with induction disk relay design is that of disk overtravel. As the disk rotates, it develops an inertia. As such, when the fault current is removed, the disk continues to rotate for some distance. Referred to as overtravel, the continued travel distance is dependent on the torque and inertia developed during operation. Depending on the distance the disk has traveled and the magnitude of the disk inertia when the fault current is removed, it is possible the inertia will cause sufficient rotation to result in the contact closure. Thus, an unnecessary trip operation is produced. Typically, an additional 0.1s is added to the time separation between the electromechanical relay time-current curve and the adjacent upstream device time-current curve. The purpose of this additional separation is to avoid unnecessary tripping of the upstream device after the primary device has cleared the fault. Static design Time-current characteristic curves for static relays are obtained through the use of analog or digital circuits. Time-current characteristic curves and tap ranges are similar to the curves and ranges provided in induction disk relays. Static overcurrent relays have the same application as induction disk relays and are particularly useful where severe vibration specifications or seismic shock is imposed. In addition, static overcurrent relays can provide faster reset times and have no significant overtravel. Instantaneous overcurrent relay Instantaneous overcurrent relays are designed to operate without any intentional time delay. Typical operating times are in the range of 0.5cycle to 2cycles. In the electromechanical design, the reset of the unit integrates over a specific time and is dependent upon dynamics within the design of the relay. Static designs typically provide instantaneous reset capabilities. Newer static designs provide the user with a selection of either instantaneous or integrating reset. This design gives the user the flexibility to utilize this relay in various applications. Electromechanical design Two types of electromechanical instantaneous relays exist and use the principle of electromagnetic attraction: solenoid (or plunger) and clapper (or hinged-armature) (see Figure REF RTF31343635343a204669675469 \hError! Reference source not found. and Figure REF RTF31323431303a204669675469 \hError! Reference source not found. , respectively). The basic elements of the solenoid relay are a solenoid and a movable plunger of soft iron. The pickup current is determined by the position of the plunger in the solenoid. A calibration screw may be provided to adjust the position of the plunger. These relays are of single-phase design with up to three relays mounted in a common enclosure. In a clapper relay, a hinged armature that is held open by a restraining spring is attracted to the pole face of an electromagnet. The magnetic pull of the electromagnet is proportional to the coil current. The pickup current is the coil current required to overcome the tension of the spring, and it may be calibrated over a specified range. In some applications, the pickup current can be varied by adjusting the position of a slug in the pole. The clapper relay is normally the one found in an induction relay case when a 50/51 (i.e., time-overcurrent with instantaneous) function is specified. For some electromechanical relays, separate Device50 relays may be required when low pickup settings (e.g., 0.5A) are desired because these low pickup settings may not be available in a combination Device50/51 relay. Static design In static designs, instantaneous overcurrent functions are normally combined with the time-overcurrent units and provided with all three phases in one enclosure. This configuration provides space savings and is generally more cost efficient. Individual instantaneous units are available where applications do not warrant the additional functions of time-overcurrent. Overcurrent relay types and their characteristic curves Time-overcurrent relays are available with many different current ranges and tap settings. The range of tap settings that are typically available are shown in Table REF RTF33333439343a205461626c65 \hTypical tap ranges and settings of time-overcurrent relays. Typical tap ranges and settings of time-overcurrent relaysTap rangeTap settings0.52.5 (or 0.52)0.5, 0.6, 0.8, 1.0, 1.2, 1.5, 2.0, 2.50.540.5, 0.6, 0.7, 0.8, 1.0, 1.2,1.5, 2.0, 2.5, 3.0, 4.01.56 (or 26)1.5, 2, 2.5, 3, 3.5, 4, 5, 6416 (or 412)4, 5, 6, 7, 8, 10, 12, 161121.0, 1.2, 1.5, 2.0, 2.5, 3.0,3.5, 4, 5, 6, 7, 8, 10, 12 The relays can be specified to have either single or double circuit closing contacts. Figure REF RTF34303334333a204669675469 \hError! Reference source not found. compares the basic shapes of five typical relay curves at the No.5 time dial. Manufacturers published time-current curves show the relay operating times for a full range of time-dial settings and multiples of tap current applied to the relay. Special types of overcurrent relays By adding different elements to the basic overcurrent relay, special types of overcurrent relays are derived, in particular, the voltage-dependent overcurrent relay. Voltagedependent overcurrent relays are used in generator circuits for backup during external faults. When an external fault occurs, the system voltage collapses to a relatively low value; but when an overload occurs, the voltage drop is relatively small. These relays utilize the voltage to modify the timecurrent characteristics so that the relay rides out permissible power swings, but gives fast response when tripping due to faults. This overcurrent relay has two variations: voltagecontrolled and voltagerestrained. Electromechanical and static relays use the same principles in the design of voltage-dependent overcurrent relays. The main difference is in the methods used to accomplish this task. Electromechanical design In the voltage-controlled overcurrent relay, an auxiliary undervoltage element controls the operation of the induction disk element. When the applied voltage drops below a predetermined level, an undervoltage contact is closed in a shaded pole circuit, permitting the relay to develop torque and operate as a conventional overcurrent relay. Thus, the undervoltage unit supervises the operating coil and permits it to operate only when the voltage is below a preset value. The voltage-restrained relay has a voltage element that provides restraining torque proportional to voltage and thus actually shifts the relay pickup current. Hence, the relay becomes more sensitive the larger the voltage drop (during faults), but is relatively insensitive at nominal voltage. The relay is set so it rides through permissible power swings at nominal voltage. See Chapter12 for additional discussion on the application of this relay for generator protection. Static design The characteristics of the static voltage-dependent relays are similar to the characteristics described in  REF RTF32373231353a2048352c312e \hElectromechanical design for electromechanical devices. These functions are accomplished through either analog or digital circuits. Voltage-controlled relays inhibit the overcurrent function from producing an output based on the voltage magnitude. If the voltage drops below the setpoint of the relay, the overcurrent function operates as normal. If the current increases above the setpoint without a decrease in voltage below its setpoint, the relay does not operate. This voltage supervision prevents nuisance tripping for any power swings that may cause the current to rise momentarily above the relays overcurrent setpoint. The voltage-restrained relay similarly reduces the overcurrent pickup setting proportional to the voltage drop. If the voltage drops to 50% of nominal, the overcurrent pickup point also decreases to 50% of its original value. Overvoltage relay (Device 59) Application Overvoltage relays are typically used to monitor voltage levels on buses or generators to initiate switching or tripping operations. Other applications for this relay are as follows: Simple overvoltage bus protection. The relay may either alarm or trip voltage-sensitive loads or circuits in order to protect them against sustained overvoltage conditions. Groundfault detection. Two methods are currently used to detect ground faults: One method measures the zerosequence voltage across the corner of a broken delta secondary of three VTs that are connected grounded wye-broken delta. A low-pickup relay is used because normally no voltage exists across the relay. During a ground fault on a high-resistance grounded-neutral or ungrounded system, the applied voltage causes the relay to operate in a predetermined period. A resistor may be required across the relay to prevent damage to the VT due to ferroresonance. The second method measures the actual voltage across a high ohmic value resistance that is connected between the system neutral and ground. The voltage appearing across the relay (and the resistor) during a ground fault may be several times the pickup voltage so that the relay can be set to operate in a specific time. The maximum continuous operating voltage limit of the relay should not be exceeded. In medium-voltage systems, a stepdown transformer is used with windings rated 120V or 240V. Using a 240V secondary of a 4160V/240V transformer produces a maximum of 139V on the secondary during a ground fault. Often, a 150V meter is used with this relay. Operation principles An overvoltage relay is designed to operate on voltage magnitude. When the voltage rises above the pickup setting of the relay, output contacts close to provide a trip signal. Overvoltage relays may be either electromechanical or static. The pickup (or tap) voltage is adjustable by discrete taps over a specified range. Various tap ranges are available depending on the relay design. In addition, some static relays provide continuous adjustment of the voltage pickup across the specified tap range. Electromechanical design Time-overvoltage relays of the electromechanical design generally use the induction disk principle. When the applied voltage is above the pickup voltage, the normally open contacts begin to close at a rate dependent on the percentage of voltage above the pickup value. This action results in a typical inverse operating characteristic. Frequency-compensated models are available that maintain constant operating characteristics over a specified range of frequency variation. The low-pickup relays used in groundfault applications have filters in the coil circuits tuned to filter out third harmonic voltages when applied to generator neutrals. This makes them less sensitive to third harmonic voltages that may be present under normal conditions. Instantaneous overvoltage relays are typically plunger relays where the armature is adjustable on the plunger rod to vary the pickup over the adjustment range. The operating time is approximately 1cycle for voltage greater than 1.5 times the pickup setting. This type of relay may be used either as an overvoltage or an undervoltage relay simply by calibrating the relay at the desired pickup or dropout voltage, although operation in the undervoltage mode is not normally recommended. Many of these relays have a dropouttopickup ratio of 90% to 98%. Care should be taken in applying these plunger relays because of the possibility of contact chatter when the pickup setting is near the normal voltage. Relays experience increased wear under those conditions. Static design Time-overvoltage relays of the static design provide similar inverse operating characteristics to the electromechanical design. These relays are frequency compensated and are capable of withstanding high levels of seismic stress without malfunction. The capability to filter third harmonic current is also available in the static design relays. Voltage balance relay (Device 60) A voltage balance relay may be used to block relays or other devices that operate incorrectly when a VT fuse blows. Two sets of VTs are required that are normally connected to the same primary source during the time when blown fuse protection is required. The relay is connected as shown in Figure REF RTF31363633313a204669675469 \hError! Reference source not found.. Normally, open contacts are used to ring an alarm, and normally closed contacts are used to open trip circuits of relays subject to misoperation, such as voltage-restrained relays, synchronizing relays, impedance relays, negative-sequence relays, and in general any relay that operates from both current and voltage inputs. Typical examples include to prevent incorrect operation of the loss-of-excitation relay (Device40) or the backup overcurrent relay (Device51V) in a generator circuit because of loss of voltage on a VT. Another application may be to inhibit the operation of a voltage regulator on a generator. The operating time is adjusted at the factory (e.g., 200ms is typical), and it is sufficiently fast to disable these relays before they have a chance to trip the circuit breaker. A voltage balance relay may also be used to detect a small voltage unbalance in a threephase system. The principal application of this relay is to protect threephase motors from the damage that may be caused by singlephase operation. The relay can detect singlephase conditions for light loads as well as heavy loads by detecting the negative-sequence component of voltage. Typically, an external timer relay is also required. Directional overcurrent relay (Device 67) Application Directional overcurrent relays are used to provide sensitive tripping for fault currents in one (tripping) direction and not trip for load or fault currents in the reverse (normal) direction. Typical applications of this relay include Protection of a network of distribution lines (not radial feeders) where tripping in a given direction to provide selective operation is required. In View(a) of Figure REF RTF31393035373a204669675469 \hError! Reference source not found., the tripping direction is for faults within the line section that are above the pickup setting of the relay. For faults on other lines from the bus at SubstationA, the operating current in the relay at SubstationA reverses, and the relay does not operate. Both phase and ground relays are normally used. Detection of uncleared faults on the utility line where fault current can be backfed through the industrial system from inplant generation or a second utility line, as illustrated in View(b) of Figure REF RTF31393035373a204669675469 \hError! Reference source not found.. The fault current magnitude fed from inplant generators and motors to the utility line normally is smaller than when it is fed from the utility line to the plant; therefore, a sensitive relay setting is required to respond to faults on the utility system. Sensitive highspeed groundfault protection of transformers and generators, as shown in View(c) and View(d) of Figure REF RTF31393035373a204669675469 \hError! Reference source not found.. The directional control gives the relay the characteristics of the differential protective scheme described in  REF RTF33373139383a2048332c312e \hDifferential and pilot wire relays (Device 87) and makes it particularly useful. Product directional relays may be used for this application. Applications required by Article450 of the National Electrical Code (NEC) (NFPA 701999)  REF RTF34323632303a204269626c69 \hError! Reference source not found., where transformers are applied in parallel with a closed secondary bus tie circuit breaker. Other applications where the desired objectives can be achieved by distinguishing between the direction of current flow. In all applications, a reference or polarizing input is required to provide the directional control. The polarizing input may be a current or voltage, or both. Current polarizing input is obtained from a CT in the neutral-grounding conductor of a generator or transformer, as shown in View(c) and View(d) of Figure REF RTF31393035373a204669675469 \hError! Reference source not found.. An auxiliary CT may be required to match the CT ratio of the operating current when the relay is connected for differential protection. The auxiliary CT is used to provide sufficient operating current during faults within the protection zone and sufficient restraint for faults outside the protection zone. Potential polarizing input for phase relays is obtained from VTs, either two units connected line to line in open delta or three units connected line to ground in wyewye, as shown in View(a) of Figure REF RTF31393035373a204669675469 \hError! Reference source not found.. The zerosequence potential required for polarizing ground relays is obtained using three VTs connected wyedelta, with the potential coil connected in series with the secondary windings. This configuration is referred to as the broken delta or corner-of-the-delta connection. Three auxiliary VTs may be used, connected as shown in View(b) of Figure REF RTF31393035373a204669675469 \hError! Reference source not found., or fully rated VTs may be used. Operation principles Directional overcurrent relays consist of an overcurrent function and a directional function. Operation of the overcurrent function is controlled by the directional function, which determines its direction of operation from a polarizing input. The polarizing input can be current or voltage, or both. The directional overcurrent relay shown in Figure REF RTF33353932353a204669675469 \hError! Reference source not found. comprises an electromechanical induction disk element and an instantaneous directional power element. When the current is flowing in the tripping direction, the directional function enables the overcurrent function to operate when the current exceeds its tap setting. If the fault current is flowing in the reverse direction, the directional function inhibits the overcurrent function and prevents operation. Electromechanical design The electromagnetic relay consists of a conventional induction disk time-overcurrent element and an instantaneous power directional element arranged as shown in Figure REF RTF33353932353a204669675469 \hError! Reference source not found.. The various time-delay characteristics may be selected as described in  REF RTF32363031353a2048342c312e \hOvercurrent relay types and their characteristic curves. The directional element has an operating current coil and a polarizing coil. The latter is energized by either voltage or current in order to determine the direction of current flow. Some units are dual polarized, having both a voltage and current coil. Maximum positive torque is produced (in tripping direction) when the angle between the operating coil current and the polarizing coil quantity is equal to the maximum torque angles of the relay. This characteristic of the directional element is shown in Figure REF RTF31343139393a204669675469 \hError! Reference source not found.. For example, maximum torque may be produced when the operating current leads the voltage by 45. In a currentpolarized relay, maximum torque may occur when the two currents are inphase (i.e., zero-phase angle). The angles of maximum torque vary; therefore, manufacturers data should be obtained. The relay is then connected to the CT and VT circuits so that during the fault conditions being protected, the relay produces maximum torque for tripping. A directional instantaneous overcurrent element is optionally available for mounting within the enclosure. Its operation is supervised by the same directional element used for the time-overcurrent element. Static design The static relay functions similarly to its electromechanical counterpart using analog or digital circuit designs similar to the design shown in Figure REF RTF32303236383a204669675469 \hError! Reference source not found.. The relay has a current input for the overcurrent and current-polarizing circuit and a voltage input for the voltage-polarizing circuit. The input quantities are generally supplied to a comparator or microprocessor, which determines whether the measured values are above the pickup settings and in the tripping direction. If both conditions are satisfied for the preset time delay, then a signal is sent to the output to provide contact closure. The directional operating characteristic for the static relay is also adjustable over a range to allow matching to the line and system conditions. Because no torque is developed to turn a disk, the characteristic setting is referred to as the angle of sensitivity. Similarly, maximum sensitivity is produced (in tripping direction) when the angle between the current and the polarizing quantity is equal to the maximum angle setting of the relay. The directional characteristic of a static relay is also depicted by a line (180 angle) through the origin of an R-X diagram that is perpendicular to the angle of maximum sensitivity. Some static relays have the capability to reduce the angle of the characteristic line (or region of operation) to something less than 180, as shown in Figure REF RTF32353937343a204669675469 \hError! Reference source not found.. This capability helps prevent false tripping for certain power system conditions, such as mutual coupling on adjacent lines. Static relays also typically have an option available for an instantaneous overcurrent function controlled by the directional function. The time-delay characteristics are similar to the electromechanical as described in 4.4.9.4 Instantaneous directional overcurrent relay An electromagnetic relay has an instantaneous induction cup element that is controlled by an instantaneous power directional element, as described in  REF RTF33323132323a2048342c312e \hOperation principles. The operating current is adjustable over a selected range, and the directional characteristics should be identified and applied in the same manner as described in  REF RTF33323132323a2048342c312e \hOperation principles. Product directional ground relay The product directional ground relay operates on the product of the current in the operating coil and the voltage or current in the polarizing coil. It provides sensitive protection in the desired direction of current flow. The operating element of an electromagnetic relay may be either an induction disk element having an adjustable time delay for selectivity or an induction cup element for highspeed operation. The directional characteristics of the relay should be determined in order to assure correct application. The application of product relays in directional applications on a network system is generally complex; this kind of relay is normally reserved for use in groundfault protection of wye-connected generator and transformer windings. Frequency relays (Device 81) Application A frequency relay is a device that operates at a predetermined value of frequency: either under or over normal system frequency or rate of change of frequency. When it is used to operate on a predetermined value below nominal frequency, it is generally called an underfrequency relay. When it operates on a predetermined value above nominal, it is called an overfrequency relay. Both functions are often included in the same case, but are utilized for different purposes. Underfrequency relays should be applied when the loads are supplied either by local generators exclusively or by a combination of local generation and utility tie (see Figure REF RTF34313637343a204669672054 \hError! Reference source not found., Figure REF RTF32333938393a204669672054 \hError! Reference source not found. , and Figure REF RTF32323030393a204669672054 \hError! Reference source not found. ). When a major generator drops off line unexpectedly in a system supplied only by local generation (see Figure REF RTF34313637343a204669672054 \hError! Reference source not found.), the underfrequency relays automatically open plant load circuit breakers so the load matches, or is less than, the remaining generation. Otherwise, moderate to severe overloads on the remaining generators could plunge the plant into a blackout before the operator can react. This application alsoapplies when the utility disconnects a plant system that has local generation (see Figure REF RTF32333938393a204669672054 \hError! Reference source not found.). When the utility does not disconnect the plant during an underfrequency condition, the plants generators begin to supply the utility system loads, causing overloading of the local generators. To prevent this event from happening, an underfrequency relay may be used to supervise an extremely sensitive directional power relay (see Figure REF RTF32323030393a204669672054 \hError! Reference source not found.). The underfrequency and reverse-power relay trip contacts are connected in series in the trip circuit of the incoming circuit breaker so that both relays would have to operate together in order totrip the incoming circuit breaker. When an overload exists (i.e., the load exceeds the available generation), the generators begin to slow down and the frequency drops. The underfrequency relay operates at a specific (i.e., preset) frequency below nominal to trip off a predetermined amount of load so the most critical load remains running with the available generation. More than one underfrequency relay may be used to permit a number of steps of load shedding, depending on the severity of the overload. For instance, X% of the load may be removed at 59.5Hz, Y% of the load removed at 59Hz, and Z% of the load removed at 58.5Hz, for a threestep load-shedding scheme. The number of load-shedding steps, the amount of load shed at each step, and the frequency settings for each step should be determined by a system study. Also, assigning a priority to each load is necessary so that the loads are removed on a priority basis, with the lowest priority loads being removed first. Overfrequency relays are often applied to generators. These relays protect against overspeed during startup or when the unit is suddenly separated from the system with little or no load. Relay contacts either sound an alarm or remove fuel input to the prime mover. In other words, for gas or diesel engines or turbines, the fuel line supply would be closed; for steam turbines or steam engines, the steam supply valves would be closed; and for hydro turbines, the wicket gates would be closed and the water supply would then be closed off. Operation principles Electromechanical design Two types of electromechanical frequency relays are available: induction disk and induction cup (or cylinder). The induction disk relay is subjected to two ac fluxes whose phase relationship changes with frequency to produce contact-opening torque above the frequency setting and closing torque below it. A time dial is used to adjust the initial contact separation that determines the operating time for a given applied frequency. The greater the rate at which the frequency drops, the faster the relay operates for a given time-dial setting. The induction disk underfrequency relay is accurate to within 0.1Hz to 0.2Hz and is designed for applications where high tripping speed is not essential. The induction cup underfrequency relay is more accurate and faster than the induction disk model. The operating principle is the same as the induction disk relay. Two ac fluxes, whose phase relationship changes with frequency, produce contact-closing torque in the cup unit when the frequency drops below the setting. The contacts have a fixed initial separation; the greater the rate of frequency decline, the faster the contacts close. The contacts may close in as little as 5cycles to 6cycles after application of the underfrequency potential. Because phase shifts in the ac potential supply due to faults or fault clearing may cause incorrect operation, at least 6cycles of intentional delay should be added before tripping. The frequency accuracy of this relay is about 0.1Hz. Induction disk and induction cup underfrequency relays usually may be adjusted at 90% to 100% of rated frequency; overfrequency relays, from 100% to 110%. Electromechanical frequency relays are typically available with only one set point per relay. In applications where multiple setpoints are required, additional relays would be necessary for each set point. Static design Some static or microprocessor relays operate on a specific frequency with definite or inverse characteristic operating times. Another static relay design operates on the rate of change of frequency. Static relays typically measure once each cycle at a zero crossing on the input voltage waveform. The relay calculates the frequency based on the time between measurement points each cycle. If the frequency is outside the set range of operation for the set time delay, the output contacts close and provide a trip signal. Static frequency relays can also inhibit operation when the voltage falls below a preset value. This action reduces the probability of operation under fault conditions when the voltage, and possibly the frequency, may drop. In addition, static frequency relays are available with multiple set points (up to four set points) in one relay, each selectable to operate for underfrequency or overfrequency conditions. Lockout relay (Device 86) Although a lockout relay is not a protective relay, it is included in this chapter because it is used widely in conjunction with relaying schemes. This relay is a highspeed, multicontact, manually or electrically reset auxiliary relay for multiplying contacts, increasing contact rating, isolating circuits, and tripping and locking out circuit breakers. The relay is operated by differential relays, such as a transformer or bus differential, and other protective relays. The lockout relay in turn trips all the source and feeder circuit breakers as required to isolate the fault. The relay must be reset before any of the circuit breakers can be reenergized. The manual reset prevents reclosing the breakers before the fault is repaired. In general, the contacts can carry and interrupt higher values of control power current than the protective relay can. In addition to tripping functions with the normally open (NO) contacts, the relay normally closed (NC) contacts are opened when tripped, and these NC contacts prevent any automatic reclosure until Device86 has been manually reset. Differential and pilot wire relays (Device 87) Application of differential relays A differential relay operates by summing the current flowing into and out of a protected circuit zone. Normally, the current flowing into a circuit zone equals the current flowing out, and no differential current flows in the relay. If a fault occurs in the circuit zone, part of the current flowing in is diverted into the fault; and the current flowing out of the circuit element is less than the current flowing in. As a result, a differential current flows in the relay. If this differential current is above a preset value, the relay operates. Differential protection may be applied to any section of a circuit and is used extensively to detect and initiate the isolation of internal faults in large motors, generators, lines or cables, transformers, and buses. It detects these faults immediately and is designed to be insensitive to overloads or faults outside the differentially protected section. Differential relays generally do not detect turntoturn coil failures on motors, generators, or transformers. Differential relays provide highspeed, sensitive, and inherently selective protection. The types of relays are Overcurrent differential Percentage differential Fixed percentage (restraint) differential Variable percentage (restraint) differential Harmonic-restraint percentage differential Highimpedance differential relay Pilot wire differential The correct selection and application of CTs used in differential protection schemes are critical to the proper operation of these schemes. The proper matching of relay and CT characteristics is a prime design requirement (see Chapter 3). Overcurrent differential relays (Device 87) An overcurrent differential relay operates on a fixed current differential and can be easily affected by CT errors. It is the least expensive form of differential relaying, but it has the least sensitive settings compared to other forms, especially for detecting lowlevel ground faults. Figure REF RTF31303837353a204669672054 \hError! Reference source not found. shows differential protection applied on one phase. (Three relaysone per phaseare required.) Both ends of the protection zone should be available for the installation of the CTs. Under normal conditions, the current flowing in each CT secondary winding is the same, and the differential current flowing through the relay operating winding is zero. For an internal fault in the zone, the CT currents are no longer the same, and the differential current flows through the relay operating circuit. When the current through the relays operating circuit exceeds its pickup setting, the relay provides an output to trip the circuit breakers. Under normal operating conditions, circumstances may produce a differential current to flow through the operating winding of the relay. One example of this situation is CT performance. CTs do not always perform exactly in accordance with their ratios. This difference is caused by minor variations in manufacture, differences in secondary loadings, and differences in magnetic history. Where a prolonged dc component exists in the primary fault current, such as invariably occurs close to generators, the CTs do not saturate equally, and a substantial relay operating current can be expected to flow. Hence, if overcurrent differential relays are used, they have to be set so that they do not operate on the maximum error current, which can flow in the relay during an external fault. Because of the sensitiveness of this circuit, the overcurrent relay pickup should be set high enough to allow for these minor variations. However, while increasing its security, the higher pickup settings reduce the sensitivity of this circuit. To address this problem without sacrificing sensitivity, the percentage differential relay is usually used. A highspeed, economical overcurrent differential relay can be applied to motor protection for phasetophase and phasetoground faults. Figure REF RTF32333237363a204669672054 \hError! Reference source not found. shows how one toroidal CT per phase measures the phase current and produces a differential current to the relay for a fault. Fault currents as low as 2A may be detected, and this application should follow the manufacturers recommendations concerning the CTs and the relay. Percentage differential relays (Device87T, Device87B, Device87M, and Device87G) Application Percentage differential relays are generally used in transformer, bus, motor, or generator applications. The advantage of this relay is its insensitivity to high currents flowing into faults outside its protection zone when CT errors are more likely to produce erroneous differential currents. However, the relay is highly sensitive to faults within its zone of protection. The three types of percentage differential relays are fixed percentage, variable percentage, and harmonicrestraint percentage. The fixed percentage and variable percentage relays are used for all the applications mentioned in the previous paragraph, but the harmonicrestraint percentage differential relay is used primarily for transformer applications. The variable percentage differential relay is more sensitive and can detect lowlevel faults within its protection zone and is less likely to have nuisance tripping for severe faults outside its protection zone than the fixed percentage relay. Generator protection relays are usually variable percentage. Less sensitive variable percentage differential relays should be selected for transformer protection compared with the fixed percentage differential relays used for bus, motor, or generator applications. This distinction is made to prevent nuisance tripping due to magnetizing inrush current that flows through only the power transformers primary circuit CTs during energization. For transformers, the standard sensitivities of these relays approach current values that may be as high as 50% of the transformers full load current. The harmonic-restraint percentage differential relay has the feature of offering more restraint to tripping when transformer inrush currents are present compared to the standard percentage differential relay. Hence, the relay can achieve fault current sensitivities (or slope settings) of between 15% and 60% of the transformers rated current. Because the inrush currents are rich in harmonics, with second harmonic predominant, a combination of the second and higher order harmonic currents is used to restrain the relay on inrush. Because of the different voltage levels and CT ratios, matching the secondary currents from the transformer into the relay becomes necessary when applying percentage differential protection to power transformers. The relay accomplishes this task by providing a range of taps that scale the current into each input to the desired magnitude for internal comparison. The current from the input circuits should be matched typically to within 5%. This normally can be accomplished by selecting the appropriate combination of relay taps. However, in cases where the range of tap settings is too limited, tapped auxiliary CTs are required. Figure REF RTF33313432303a204669675469 \hError! Reference source not found. shows a connection diagram for a fixed percentage differential relay applied to protect a transformer. Electromechanical percentage differential relays used for bus protection applications typically do not have taps. Therefore, all CTs should have the same ratio and characteristics. Static relays, however, are available with taps for use with CTs that have different ratios. Operating principles Electromechanical design The electromechanical differential relay uses the induction principle. It is connected as shown in Figure REF RTF34303439363a204669675469 \hError! Reference source not found.. Under normal conditions, current circulates through the CTs and relay-restraining coils R1 and R2; no current flows through the operating coil O. The current in the relay-restraining coils produces a restraining or contactopening torque. An internal fault in the protected machine unbalances the secondary currents and forces a differential current I0 through the relay-operating coil. For a fixed percentage differential relay, the amount of differential or operating current required to overcome the restraining torque and close the relay is a fixed (or constant) percentage of the restraining current. The operating characteristic for this relay is shown in Figure REF RTF32373030363a204669672054 \hError! Reference source not found.. As an example, for a setting of 10% on a fixed percentage differential relay, the relay would trip if the operating current were greater than or equal to 10% of the restraint current. In a variable percentage relay, the operating current required to operate the relay is a variable percentage of the restraining current, having a higher percentage at high fault-current levels. The operating characteristic for this relay is shown in Figure REF RTF32393631343a204669672054 \hError! Reference source not found.. The number of restraint elements in the relay is a function of application for which the relay is designed. A generator or motor differential relay contains two restraint elements, where a relay intended for bus or transformer protection may have multiple restraint elements. All relays are singlephase units and thus require three relays for a complete installation. Static design The static percentage differential relay consists of various functions, as shown in the block diagram of Figure REF RTF33373230303a204669675469 \hError! Reference source not found.. Because of the flexibility of the static technology, these functions can be configured for a single-phase unit or connected together to provide a threephase relay. The relay generally consists of restraint, operating, sensing, trip, and indicating functions. If the relay is a microprocessor-based design, the restraint and operating functions are accomplished with the microprocessor. The input current is normally scaled to the appropriate magnitude based on the tap setting of each input circuit. Depending on relay design, these scaled quantities are then input to a phase-shifting circuit or directly into the restraining functions. The restraint function senses the phase current and selects its reference value. The restraint reference level, typically a function of the input current, may vary between different manufacturers. The operating current for each phase is then compared to the percentage slope setting and the restraint reference levels. If the magnitude of current in the operating circuit is in excess of the set percentage restraint, the relay closes its contact to trip the circuit breakers. Harmonic-restraint percentage differential relays (Device 87T) The connection diagram for deltawye transformer protection using a harmonic-restraint percentage differential relay is shown in Figure REF RTF32323630333a204669675469 \hError! Reference source not found.. Harmonic-restraint relays use the harmonic content of transformer energization current to inhibit differential operation. When a transformer is energized, the current on one side increases, producing a difference current that would cause the differential relay to operate. This energization current contains a significant magnitude of certain harmonic currents. The relay measures the magnitude of various harmonic currents and, when above a preset percentage of fundamental, inhibits operation. Protection for faults during transformer energization is provided by an unrestrained overcurrent function. The electromechanical relay consists of transformer and rectifier units connected in restraint and operating configurations. The output of these units is applied to the differential unit and causes it to close its trip contact when the operating current exceeds the restraint current by an amount greater than the relay characteristic. The harmonic-restraint element is constructed similarly, except that filters block the fundamental frequency current to the restraint unit while directing harmonic current to the restraint unit. The operating unit of this element receives only fundamental frequency current, while harmonics are blocked, causing the relay to be insensitive to the harmonic current that flows during transformer energization. An instantaneous trip unit is included in the operating circuit to provide fast operating times on very high internal fault currents. These relays have current taps that are used to correct for mismatch between the currents from the CTs in the power transformers primary and secondary circuits. Relay sensitivity can be adjusted by selecting an appropriate slope tap unless the relay has a variable percentage characteristic. Tap changers should be considered in the selection of the slope. A tap changer range of 5% would add 10% to the slope of whatever else is considered. The overall relay operating time is between 1cycle and 2cycles. Static relays similarly filter the input currents to the relay for various harmonic currents. The output is then compared to the reference setting and, if in excess, provides a signal to inhibit relay operation during transformer energization. This situation is shown in Figure REF RTF33373230303a204669675469 \hError! Reference source not found.. Highimpedance differential relays (Device 87B) The highimpedance differential relay, used primarily for bus protection, avoids the problem of unequal CT performance by loading transformers with a highimpedance relay unit. For faults outside the protected zone (i.e., external faults), there is a high degree of error in the CTs in the faulted circuit. A higher-than-normal voltage is developed across the relay (typically having an impedance of 1700W to 2600W), and hence a higher voltage is impressed across the CT, which increases the CT excitation current. As a result, CT error currents are forced through the equivalent magnetizing impedance of the CTs rather than through the high impedance of the relay. However, for faults within the protected zone, the CT error currents are small, the CT magnetizing impedances appear to be almost infinite, and the current flows through the relay coil. The connection diagram for the highimpedance differential relay, designed to operate on bus circuits, is shown in Figure REF RTF32353830303a204669675469 \hError! Reference source not found.. The electromechanical relay consists of an overvoltage unit and an instantaneous overcurrent unit (either plunger or clapper). The overvoltage unit is connected across the paralleled secondaries of the CTs. The magnitude of voltage across the relay is a function of the fault location (i.e., internal or external to the protected zone), the resistance of the CT secondary leads and CT, the CT performance, the CT ratio, and the magnitude of fault current. The overvoltage unit operates when the voltage exceeds the pickup setting. When a fault occurs in the relays protection zone, the CT current is directed to the highimpedance relay. A nonlinear resistor in the relay limits the voltage developed across the relay to a value that does not overstress the relays insulation. This nonlinear element limits the voltage by permitting a large current to flow through it. The instantaneous overcurrent unit in the relay is connected in series with the nonlinear resistor and operates when the current exceeds its pickup setting. This relay provides fast tripping times of 0.5cycle to 1.5cycles on very severe faults within its protection zone. Pilot wire differential relays (Device 87L) Application The differential relays discussed thus far in  REF RTF33373139383a2048332c312e \hDifferential and pilot wire relays (Device 87) cannot be used to protect long lines or cables because of the distances required to bring CT leads and breaker tripping wires to the relay from both ends of the line. Therefore, a special type of relay called a pilot wire differential relay is used to protect lines. The pilot wire differential relay is a highspeed relay designed for phase and ground protection for two- and three-terminal transmission and distribution lines. They are generally applied on short lines, normally less than 40km long. Their operating speed is approximately 20ms. One of the typical pilot wire relays is discussed in  REF RTF33333839333a2048352c312e \hOperating principles of a current pilot wire relay. Operating principles of a current pilot wire relay Pilot wire differential relaying is a relay system consisting of two identical relays located at each end of a line (see Figure REF RTF32373735363a204669675469 \hError! Reference source not found.). The relays are connected together with a twoconductor pilot wire. The output from three individual phase CTs is applied to a sequence network that produces a composite current that is proportional to the line current and has a polarity related to line current flow direction. Each relay contains a restraint element and an operate element. The restraint elements are in series with the pilot wire, while the operate elements of each relay are in parallel with the pilot wire. The circuit is basically that of the percentage (restraint) differential relay with the operating circuit broken into parallel circuits separated by pilot wires. This relay is available in both electromechanical and static designs. When the fault is external to the relays protective zone (see Figure REF RTF32373735363a204669675469 \hError! Reference source not found.), current flows in the pilot wire through each relays restraint coils, but not through the relays operating coil. If the fault is within the relays protective zone and current is flowing into the fault from both directions, the direction of pilot wire current IPA remains the same; but the direction of current IPB reverses and forces current to flow into each relays operating coil. If the fault current flows through circuit breaker A only, the relay at A still passes sufficient current through the pilot wire to operate the relay at circuit breaker B. The relay is designed to give complete phase and ground-fault protection. The ground protection is derived from the residual connection of the line CTs, and its sensitivity depends on the CT ratio. A static pilot wire relay is available that accepts an input from a lowratio zero-sequence CT. This feature allows for a sensing lowlevel ground current that is useful when applied on a low-resistance grounded system. Compliance with the manufacturers application instructions is necessary to provide a total system of protection. Pilot wire specifications To insure the pilot relay system is reliable, details should be specified on the construction and installation of the pilot wires. Construction requirements should include wire size, insulation, twist length, shielding, and jacketing. Installation instructions should include whether overhead or underground (if overhead, include spacing below any power lines), splicing, where to ground the shield, protection of pilot wire shield against excessive currents, protection of cable and relays from overvoltages, and how to treat spare wires that are in the same conductor bundle as the pilot wires. Much controversy exists on what the exact specifications should be because many variations have worked successfully. A sample specification that has proved satisfactory at a number of industrial sites, for both overhead and underground applications, is given in  REF RTF31343231323a2048362c312e \hPilot wire construction requirements and  REF RTF33333637303a2048362c312e \hPilot wire installation instructions. Pilot wire construction requirements Wire size. Six pairs of AWG No 19 solid annealed copper conductors shall be used. (Maximum pilot wire loop resistance should be less than 2000W and maximum capacitance is 1.5mF for a twoterminal system.) Insulation. Each conductor shall be insulated with 0.381 mm polyethylene. The conductor shall be bound with a nonhydroscopic binder tape, over which shall be extruded a high-dielectric polyethylene inner jacket. The jacket shall have a nominal thickness of 1.143 mm. Twist length. The pairs shall be twisted with a minimum twist length of 178 mm. The twist length of each pair shall be different. Shield. Over the inner jacket shall be applied a spiral-wound shield tape with a minimum overlap of 20% of the tape width. The tape shall be 0.127 mm thick copper or 0.203 mm thick aluminum. Overall jacket. An overall jacket shall be applied over the shield tape. The thickness of the jacket over the shield tape shall be 0.152 mm. The overall jacket shall encompass the cable and messenger in a Figure-8 configuration. The jacket compound shall be applied so that it completely floods the interstices of the messenger. The outer jacket material shall be pigmented for protection from radiation and may be either polyvinyl chloride or polyethylene. Messenger. The messenger shall be 6.35 mm, 7strand, extra strength steel (minimum breaking strength, 30 kN) with Class A zinc coating. Messenger shall comply with ASTM A47569. Cable. The cable shall comply with the requirements of ICEA S61402 for TypeD control cable for pilot wire duty. DC high-potential test. In addition to the testing required by the reference specifications, the completed cable shall be subjected to a 20000V dc high-potential test in accordance with IEEE standards between conductors and shield and between shield and the messenger. Pilot wire installation instructions Ground the messenger wire at each pole. Ground the shield at each terminal. Connect shield to station ground. Shield should be continuous end to end. Protect shield from possible transient overcurrent during system faults with parallel power conductor. Because potential differences in grounds may exist during fault conditions, a conductor should be connected in parallel with the shield to carry the current that may flow between grounds rather than permit the current to flow through the shield. Splices (if required) shall be in line using Scotchmold Epoxy splice kits or equal. Insulating transformers shall not have a midpoint grounded on a high-voltage side. Neutralizing transformers shall not be used. Carbon gaps shall not be used. Mutual drainage reactors or gas discharge tubes, or both, shall not be used. If any pair in cable is used for purposes other than pilot wire, it shall be Twisted pair with twist length different from pilot wire pair, Ungrounded, Terminated at each end in 10 kV (minimum) insulating transformers or equivalent. Unused pairs in cable shall be shortcircuited and grounded at only one end. Terminal blocks are acceptable only if they are mounted on suitable standoff insulators and only if suitable clearances to ground and to shields are maintained. Line clearances shall comply with the National Electrical Safety Code (NESC) (ASC C2-2002). Application guidelines Other devices are required and applied with each relay terminal to provide a complete system. These devices include a milliammeter, switch, and auxiliary transformer for testing; insulating transformer for pilot wire isolation; and pilot wire supervision relays for detection and alarm of pilot wire problems. An optional neutralizing reactor is applied where the difference between station ground and remote ground can exceed 600V rms during power system faults. This rise in ground potential appears across the neutralizing transformer inserted in the pilot wire. In addition, an optional drainage reactor is applied to drain off longitudinally induced voltages that may occur by lightning surges (not a direct stroke) or the parallel association of the pilot wire with faulted power circuits. By forcing equal current flow from the two wires into ground, it minimizes wiretowire voltages. Taps Current taps are provided to give adjustable minimum trip selection and sequence filter circuit taps that permit phase and ground sensitivity selection. Relay Types See above Switchgear, switchboards, panelboards, and Industrial busways 5.1 General Discussion Electric systems for commercial installations encompass a wide variety of electrical apparatus. There are numerous choices to be made between similar equipment, which either have overlapping functions or which are direct substitutes with varying advantages or degrees of acceptability to a particular application. The engineer making these basic decisions should consider all facets of the actual project including, but not limited to, protection; coordination; initial cost including installation, operational personnel and cost; maintenance facilities and cost; availability and cost of space; and the procurement time to meet objectives. Equipment connecting directly to the serving electric utility should be compatible with the utility's requirements. General descriptions of apparatus frequently used in these electric systems follow in this order: Transformers Medium- and high-voltage fuses Metal-enclosed 5-34 .5 kV load interrupter switchgear Metal-clad 5-34.5 kV circuit breaker switchgear Metal-enclosed, low-voltage 600 V power switchgear and circuit breakers Metal-enclosed distribution switchboards Primary-unit substations Secondary-unit substations Panelboards Molded-case circuit breakers Low-voltage fuses Service protectors Enclosed switches Bolted pressure switches High-pressure contact switches Network protectors Lightning and transient protection Load transfer devices Interlock systems A brief explanation of equipment ratings is provided in 5.2.1. ANSI and NEMA Standards and other publications referred to in the text are listed in 5.22 and a bibliography is included in 5.23. Other equipment related to power conditioning (e.g., voltage regulators, power line conditioners, uninterruptible power supplies, adjustable frequency drives, etc.) are discussed elsewhere in this book. The safety of high-voltage installations should also be considered. ANSI/NFPA 70-1990, National Electrical Code (NEC) [9]45 and ANSI C2-1990 , National Electrical Safety Code (NESC) [1]46 are guidelines in this area. In addition, independent, nationally recognized testing laboratories (i.e., UL, Factory Mutual, etc.) publish standards on certain electrical apparatus. The code-enforcing agency will have final approval as to the acceptability of equipment; see Chapter 1, 1.6 for a discussion of the NEC, OSHA, equipment labeling, identification, and "approval by the code- enforcing agency" requirements for power system apparatus. 45The numbers in brackets correspond to those in the references at the end of this chapter. ANSI publications are available from the Sales Department of the American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036. NFPA publications are available from Publications Sales, National Fire Protection Association, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101. 46ANSI publications are available from the Sales Department of the American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036. Switchgear 10.3 Switchgear 10.3.1 General discussion Switchgear is a general term that describes switching and interrupting devices, either alone or in combination with other associated control, metering, protective, and regulating equipment, which are assembled in one or more sections. A power switchgear assembly consists of a complete assembly of one or more of the above- noted devices and main bus conductors, interconnecting wiring, accessories, supporting structures, and enclosure. Power switchgear is applied throughout the electric power system of an industrial plant, but is principally used for incoming line service and to control and protect load centers, motors, transformers, motor control centers, panelboards, and other secondary distribution equipment. Outdoor switchgear assemblies can be of the non-walk-in (without enclosed maintenance aisle) or walk-in (with an enclosed maintenance aisle) variety. Switchgear for industrial plants is generally located indoors for easier maintenance, avoidance of weather problems, and shorter runs of feeder cable or bus duct. In outdoor applications the effect of external influences, principally the sun, wind, moisture, and local ambient temperatures, should be considered in determining the suitability and current-carrying capacity of the switchgear. Further information on outdoor applications is contained in IEEE Std C37.24-1986 [B29]. In many locations, the use of lighter colored (non-metallic) paints will minimize the effect of solar energy loading so as to avoid derating of the equipment in outdoor locations. See IEEE Std C37.24-1986 [B29]. 10.3.2 Classifications An open switchgear assembly is one that does not have an enclosure as part of the supporting structure. Since open switchgear assemblies are rarely used in industrial installations, consideration will be given to metal-enclosed assemblies only. An enclosed switchgear assembly consists of a metal-enclosed supporting structure with the switchgear enclosed on the top and all sides with sheet metal (except for ventilating openings and inspection windows). Access within the enclosure is provided by doors or removable panels. Metal-enclosed switchgear is universally used throughout industry for utilization and primary distribution voltage service, for ac and dc applications, and for indoor and outdoor locations. 10.3.3 Types of metal-enclosed switchgear Specific types of metal-enclosed switchgear used in industrial plants are defined as (1) metal- clad switchgear, (2) low-voltage power circuit breaker switchgear, and (3) interrupter switchgear. The metal-enclosed bus will also be discussed because it is frequently used in conjunction with power switchgear in modern industrial power systems. 10.3.3.1 Metal-clad switchgear Metal-clad switchgear is metal-enclosed power switchgear characterized by the following necessary features: The main circuit switching and interrupting device is of the removable type arranged with a mechanism for moving it physically between connected and disconnected positions, and equipped with self-aligning and self-coupling primary and secondary disconnecting devices. Major parts of the primary circuit, such as the circuit switching or interrupting devices, buses, potential transformers, and control power transformers, are enclosed by grounded metal barriers. Specifically included is an inner barrier in front of, or as a part of, the circuit interrupting device to ensure that no energized primary circuit components are exposed when the unit door is opened. All live parts are enclosed within grounded metal compartments. Automatic shutters prevent exposure of primary circuit elements when the removable element is in the test, disconnected, or fully withdrawn position. Primary bus conductors and connections are covered with insulating material throughout. For special configurations, insulated barriers between phases and between phase and ground may be specified. Mechanical interlocks are provided to ensure a proper and safe operating sequence. Instruments, meters, relays, secondary control devices, and their wiring are isolated by grounded metal barriers from all primary circuit elements, with the exception of short lengths of wire associated with instrument transformer terminals. The door, through which the circuit-interrupting device is inserted into the housing, may serve as an instrument or relay panel and may also provide access to a secondary or control compartment within the housing. Auxiliary frames may be required for mounting associated auxiliary equipment, such as potential transformers, control power transformers, etc. The term metal-clad switchgear can be properly used only if metal-enclosed switchgear conforms to the foregoing specifications. All metal-clad switchgear is metal-enclosed, but not all metal-enclosed switchgear can be correctly designated as metal-clad. 10.3.3.2 Low-voltage power circuit breaker switchgear Metal-enclosed power circuit breaker switchgear of 1000 V and below is metal-enclosed power switchgear, including the following equipment as required: Power circuit breakers of 1000 V and below (fused or unfused) Non-insulated bus and connections (insulated and isolated bus is available) Instrument and control power transformers Instruments, meters, and relays Control wiring and accessory devices Cable and busway termination facilities g) Shutters to automatically cover line-side contacts when the circuit breaker is withdrawn The power circuit breakers of 1000 V and below are contained in individual grounded metal compartments and controlled either remotely or from the front of the panels. The circuit breakers are usually of the drawout type, but may be stationary ( xed or plug-in). When drawout-type circuit breakers are used, mechanical interlocks must be provided to ensure a proper and safe operating sequence. 10.3.3.3 Interrupter switchgear Metal-enclosed interrupter switchgear is metal-enclosed power switchgear, including the following equipment as required: Interrupter switches or circuit switchers Power fuses (if required) Non-insulated bus and connections Instrument and control power transformers Control wiring and accessory devices The interrupter switches and power fuses may be of the stationary or removable type. For the removable type, mechanical interlocks are provided to ensure a proper and safe operating sequence. 10.3.3.4 Metal-enclosed bus Metal-enclosed bus is an assembly of rigid electrical buses with associated connections, joints, and insulating supports, all housed within a grounded metal enclosure. Three basic types of metal-enclosed bus construction are recognized: nonsegregated phase, segregated phase, and isolated phase. The most prevalent type used in industrial power systems is the nonsegregated phase, which is defined as one in which all phase conductors are in a common metal enclosure without barriers between the phases. When metal-enclosed buses over 1000 V are used with metal-clad switchgear, the bus conductors and connections are covered with insulating material throughout. When metal-enclosed buses are associated with metal- enclosed power circuit breaker switchgear of 1000 V and below or metal-enclosed interrupter switchgear, the primary bus conductors and connections are usually noninsulated. 10.3.4 Ratings The ratings of switchgear assemblies and metal-enclosed buses are designations of the operational limits of the particular equipment under specific conditions of ambient temperature, altitude, frequency, duty cycle, etc. Table 10-5 lists the rated voltages and insulation levels for ac switchgear assemblies discussed in this section. The ratings for metal-enclosed buses are identical to those listed in table 10-5. Rated voltages and insulation levels for dc switchgear assemblies can be found by referring to IEEE Std C37.20.1-1987 [B26], IEEE Std C37.20.2-1987 [B27], and IEEE Std C37.20.3-1987 [B28]. The definition of the ratings listed in table 10-5, and others subsequently discussed, can be found in IEEE Std C37.100-1992 Table 10-5-Rated voltages and insulation levels for ac switchgear assemblies Rated voltage (rms)Insulation levels (kV)RatedRatedPowerDCImpulsenominal voltagemaximum voltagefrequency withstand (rms)withstand*withstandMetal-enclosed low-voltage power circuit breaker switchgear (in V)2402542.23.14805082.23.16006352.23.1Metal-clad switchgear (in kV)4.164.761927607.28.2536509513.815.036509534.538.080t150Metal-enclosed interrupter switchgear (in kV)4.164.761927607.28.2526377513.815.036509514.415.5507011023.025.860t12534.538.080t150Station-type cubical switchgear (in kV)14.415.550t11034.538.080t15069.072.5160t350 Source: Table based on IEEE Std C37.20-1987 [B251. Notes based on IEEE Std C37.20.1-1987 [B261, IEEE Std C37.20.2-1987 [B271, and IEEE Std C37.20.3-1987 [B2811. *The column headed DC withstand is given as a reference only for those using dc tests to verify the integrity of connected cable installations without disconnecting the cables from the switchgear. It represents values believed the corresponding power frequency withstand test values specified for each voltage rating of switchgear. The presence of this column in no way implies any requirement for a dc withstand test on ac equipment or that a dc withstand test represents an acceptable alternative to the low-frequency withstand tests specified in this standard, either for design tests, production tests, conformance tests, or field tests. When making dc tests, the voltage should be raised to the test value in discrete steps and held for a period of 1 min. tBecause of the variable voltage distribution encountered when making dc withstand tests, the manufacturer should be contacted for recommendations before applying dc withstand tests to the switchgear. Voltage transformers above 34.5 kV should be disconnected when testing with dc. See IEEE Std C57.13-1978 [B351, Section 8, and in particular, 8.8.2 (the last paragraph), which reads "Periodic kenotron tests should not be applied to transformers of higher than 34.5 kV voltage rating." [B3 1]. The short-circuit withstand level and duration capabilities of switchgear assemblies and metal-enclosed bus must be completely coordinated with the operating characteristics of the power system line-side interrupter. The continuous-current rating of the switchgear main bus must be no less than that of the highest rated overcurrent device or through current to which it must be subjected. The rated continuous current of a switchgear assembly is the maximum current in rms amperes, at rated frequency, that can be carried continuously by the primary circuit components without causing temperatures in excess of the limits specified in IEEE Std 37.20.1-1987 [B26]. The standard ratings of the main bus in ac low-voltage switchgear are 600 A, 800 A, 1200 A, 1600 A, 2000 A, 3000 A, 3200 A, or 4000 A, and in dc low-voltage switchgear are 1600 A, 2000 A, 2500 A, 4000 A, 5000 A, 6000 A, 8000 A, 10 000 A, and 12 000 A (IEEE Std C37.20.1-1987). The continuous-current rating of the vertical and section bus riser shall be equal to the frame size of ac low-voltage power circuit breaker used except any modification required for cumulating loading of multiple breakers (IEEE Std C37.20.1-1987 [B26]). The momentary and short-time short-circuit current ratings of power switchgear assemblies shall correspond to the equivalent ratings of the switching or interrupting devices used. The limiting temperature for a power switchgear assembly or metal-enclosed bus (where applicable) is the maximum temperature permitted for the following: Any component, such as insulation, buses, instrument transformers, and switching and interrupting devices; Air in cable termination compartments; Any non-current-carrying structural parts; For the air adjacent to devices; The operating temperature of the cable(s) connected to all switchgear termination lugs, while at maximum cable loading, must not exceed the rated temperature of the terminals. The information regarding temperature limits of insulating materials (hottest spots), buses and connections (hottest spots), and temperature limitations for air surrounding devices within an enclosed assembly and surrounding insulated power cables can be obtained from IEEE Std C37.20.1-1987 [B26]. 10.3.5 Application guides After determining system requirements for continuity of service, reliability, security, and safety, the engineer should establish initial system capacity and provisions for future load growth. From this data, the engineer can establish maximum fault duty and select the type of power switching apparatus for the primary and secondary distribution systems. For the primary system, the choice is between circuit breaker and switch-fuse combinations. For the secondary system, the choice is between fused and unfused power circuit breaker combinations and switch-fuse combinations. The following steps are normally taken in applying switchgear equipment: Develop a one-line diagram Determine short-circuit rating Determine rating of power switching apparatus Select main bus rating Select current transformers Select voltage transformers Select metering, relaying, and control power Determine closing, tripping, and other control power requirements Consider special applications Metal-enclosed switchgear is available for application at voltages through 34.5 kV. Metal- clad switchgear is available for application at voltages from 2.4 kV through 34.5 kV; however, it is seldom used above 15kV for economic reasons. Gas-insulated switchgear is available for higher voltage. Metal-enclosed switchgear is adaptable to many applications because it is easily expanded and can be specified and designed with load location and load characteristics in mind. If metal-enclosed switchgear with drawout-interrupting devices is applied, maintenance is facilitated because of the accessibility of most components. On the average, metal-enclosed switchgear represents a small percentage of total plant cost. Metal-enclosed switchgear is generally shipped factory-assembled and pretested and reduces the amount of expensive field assembly. Essentially, all recognized basic bus arrangements, radial, double bus, circuit breaker and half, main, and transfer bus, sectionalized bus, synchronizing bus, and ring bus are available in metal-enclosed switchgear to ensure the desired system reliability and flexibility. A choice is made based on an evaluation of initial cost, installation cost, required operating procedures, and total system requirements. The switchgear assembly should have momentary and short-time ratings equal, respectively, to the close-and-latch capability and short-time rating of the circuit breaker or short circuit rating at the fused switch. Current transformers (CTs) are used to develop scale replica secondary currents, separated from the primary current and voltage, to provide a readily usable current for application to instruments, meters, relays, and analog communication with computers. For switchgear applications, CTs are manufactured in single and double secondary types and the tapped multiratio type. The double secondary is suitable where two transformers of the same ratio would otherwise be required at the same location, with a resulting saving in space. The primary current rating should be no less than 125% of the ultimate full-load current of the circuit. The metering and relaying accuracy must be adequate for the burdens imposed upon the current transformer. The current transformer accuracy and excitation characteristics must be checked for proper relay application. Tables 10-6 and 10-7 list standard ratios and relaying and metering accuracies for current transformers. Table 10-6Standard accuracy class rating* current transformers in ac low-voltage switchgear RatioB 0.1B 0.2100:51.22.4t150:51.22.4t200:51.20.6300:50.60.6400:50.60.6600:50.60.3800:50.30.31200:50.30.31500:50.30.32000:50.30.33000:50.30.34000:50.30.35000:50.30.36000:50.30.3 Source: Reprinted from IEEE Std C37.20.1-1987 [B261. *See IEEE Std C57.13-1978 [B351. tNot in IEEE Std C57.13-1978 [B351. Voltage transformers (VTs) are used to transform primary voltage to a nominal safe value, usually 120 V. The primary rating is normally that of the system voltage, although slightly higher ratings may be used, i.e., a 14 400 V rating on a 13 800 V nominal system. These transformers are used to isolate the primary voltages from the instrumentation, metering, and relaying systems, yet provide replica scale values of the primary voltage. All ratings, such as impulse, dielectric, etc., should be adequate for the purpose. Table 10-8 lists standard voltage transformer ratios. 10.3.6 Control power Successful operation of switchgear embodying electrically operated devices is dependent on a reliable source of control power that will maintain voltage at all times at the terminals of all devices within their rated operating voltage range. See table 10-9. Table 10-7Standard accuracy class ratings* current transformers in metal-clad switchgear RatioMetering accuracy 60 Hz standard burdensRelaying accuracyB 0.1B 0.2B 0.5B 1.0B 2.050:5t1.22.4C or T 1075:5t1.22.4C or T 10100:51.22.4C or T 10150:50.61.22.4C or T 20200:50.61.22.4C or T 20300:50.61.22.42.4C or T 20400:50.30.61.21.22.4C or T 50600:50.30.30.31.22.4C or T 50800:50.30.30.30.61.2C or T 501200:50.30.30.30.30.3C 1001500:50.30.30.30.30.3C 1002000:50.30.30.30.30.3C 1003000:50.30.30.30.30.3C 1004000:50.30.30.30.30.3C 100 Source: Reprinted from IEEE Std C37.20.2-1987 [B2711. *See IEEE Std C57.13-1978 [B351. tThese ratios and transformer accuracies do not apply for metal-clad switchgear assemblies having rated momentary current above 60 000 A rms. Where such assemblies have a rated momentary current above 60 000 A rms, the minimum current transformer ratio shall be 100:5. This metering accuracy is not in IEEE Std C57.13-1978 [B351. Table 10-8Standard voltage transformer ratios 2400/4160Y1202400120420012048001207200120840012012 00012014 000120 Table 10-9Preferred control voltages and their ranges for low-voltage power circuit breakers and ac power circuit protectors* Voltage rangest, :1:, , **Nominal voltageClosing and auxiliary functionsTripping functionsDirect currenttt24:1::1:142848:1::1:3856285612510014070140250200280140280Voltage rangest, :1:, , **, Nominal voltage (60 Hz)Closing, tripping, and auxiliary functionsAlternating currentsingle phase120104_127***, t240208_254***480416_508***Alternating currentpolyphase208Y/1201 80Y/104220Y/127240208254480416508480Y/227416Y/240508Y/292 Source: Based on ANSI C37.16-1988 [B21. NOTESee IEEE Std C37.13-1990 [B221, IEEE Std C37.14-1979 [B231, IEEE Std C37.18-1979 [B241, and IEEE Std C37.29-1981 [B301. *When measured at the control power terminals of the operating mechanisms with the maximum operating current flowing, nominal voltages and their permissible ranges for the control power supply of switching and interrupting devices shall be as shown above. Table 10-9Preferred control voltages and their ranges for low-voltage power circuit breakers and ac power circuit protectors* (continued) tRelays, motors, or other auxiliary equipment that function as a part of the control for a device shall be subject to the voltage limits imposed by this standard, whether mounted at the device or at a remote location. The performance capability of an individual device over the full range of closing, auxiliary, and tripping voltages specified here shall be as defined in the C37 standard that covers the particular device. Switchgear devices in some applications may be exposed to control voltages exceeding those specified here owing to abnormal conditions, such as abrupt changes in line loading. Such applications require specific study, and the manufacturer should be consulted. Also, application of switchgear devices containing solid-state control exposed continuously to control voltages approaching the upper limits of ranges specified here requires specific attention, and the manufacturer should be consulted before application is made. Mining circuit breakers may require control voltages as high as 325 Vdc. **Some solenoid operating mechanisms are not capable of satisfactory performance over the range of voltage specified here; moreover, two ranges of voltage may be required for such mechanisms to achieve a satisfactory level of performance. For these solenoid-operated devices, the following table is applicable: Rated Voltage (dc) Closing voltage ranges for power supply 125 90115 or 105130 250 180230 or 210260 230 190230 or 210250 The preferred method of obtaining the double range of closing voltage is by use of tapped coils. Otherwise it will be necessary to designate one of the two closing voltage ranges listed above at representing the condition existing at the device location owing to battery or lead voltage drop or control power-transformer regulation. Also, caution should be exercised to ensure that the maximum voltage of the range used is not exceeded if the solenoid operator is energized during the time the station battery is on equalizing charge. ttIt is recommended that the coils of closing, auxiliary, and tripping devices that are directly connected to one dc potential be connected to the negative control bus so as to minimize electrolytic deterioration. j24 V tripping or 48 V tripping, closing, and auxiliary functions are recommended only when the device is located near the battery or where special effort is made to ensure the adequacy of conductors between battery and control terminals. 24 V closing is not recommended. Includes supply for pump or compressor motors. ***Includes heater circuits. ttt Shunt trip devices used with remote mounted ground-fault relaying must operate at 50% of the nominal voltage ratings. There are two primary uses for control power in switchgear: tripping power and closing power. Since an essential function of switchgear is to provide instant and unfailing protection in emergencies, the source of tripping power must always be available. The requirements for the security of the source of closing power are less rigid, and other options are available. For devices of 1000 V and below, manual closing for devices through 1600 A frame is a common practice. Four practical sources of tripping power are as follows: Direct current from a storage battery Direct current from a charged capacitor Alternating current from the secondaries of current transformers in the protected power circuit Direct or alternating current in the primary circuit passing through direct-acting trip devices Where a storage battery has been chosen as a source of tripping power, it can also supply closing power. The battery ampere-hour and inrush requirements have been reduced considerably with the advent of the stored-energy spring mechanism closing on power circuit breakers through 34.5 kV. General distribution systems, whether ac or dc, cannot be relied upon to supply tripping power because outages are always possible. These are most likely to occur in times of emergency, when the switchgear is required to perform its protective functions. Other factors influencing the choice of control power are as follows: Availability of adequate maintenance for a battery and its charger Availability of suitable housing for a battery and its charger Advantages of having removable circuit breaker units interchangeable with those in other installations Necessity for closing overcurrent devices with the power system de-energized The importance of periodic maintenance and testing of the tripping power source cannot be overemphasized. The most elaborate protective relaying system is useless if tripping power is not available to open the overcurrent device under abnormal conditions. Alarm monitoring for abnormal conditions of the tripping source and for circuits is a general requirement. Space heaters are supplied as a standard feature on outdoor metal-enclosed switchgear. Often ambient temperatures or other environmental conditions dictate the use of space heaters in indoor switchgear as well. When space heaters are furnished, they should be continuously energized from an ac power source. Since heaters are usually needed when the switchgear is out of service, a separate source of heater power is desirable. Standard air-magnetic or vacuum power circuit breakers are rated at 60 Hz, but can be applied as low as 50 Hz without derating. For a 25 Hz application, however, there is a derating factor that should be applied to the circuit breaker interrupting rating. Equipment manufacturers should be consulted to determine the proper derating factor for low-frequency power switchgear applications. The application of metal-enclosed switchgear in contaminated atmospheres may create many problems if adequate precautions are not taken. Typical precautions include, but are not limited to, the following: Location of equipment away from localized sources of contamination and potential sources of moisture, such as steam pipes and traps, water pipes, etc. Isolation of equipment through the use of air-conditioning or pressurization equipment Development of an appropriate supplemental maintenance program Maintenance of adequate spare-part replacements Switchboards 11.3 Switchboard and panel instruments Switchboard and panel instruments are permanently mounted, and most are single-range devices used in the continuing operation of a plant. The current coils of most instruments are rated 5 A; their potential coils are typically rated 120 V. Whenever the current and voltage of a circuit exceed the rating of the instruments, current and voltage (potential) transformers are required. In general, switchboard instruments are physically larger, have longer scale lengths, are more tolerant of transients and vibrations, and are more accurate than an equivalent panel instrument. For example, an analog ammeter for switchboards might be 45 in square with a scale length of 6 in and an accuracy of 1% of full scale. An equivalent analog panel ammeter might have a diameter of 23 in, a scale length of 1.5 in, and an accuracy of 2% of full scale. Accuracy at low scale decreases significantly with some instruments. Digital instruments often have accuracy ratings as a percentage of the reading plus or minus one or more reading digits. With both types of instruments, it is always recommended to specify the size, scale, and accuracy needed. Some of the common instruments are discussed below. (Also see ANSI C39.1-1981 [B4]1 for standard sizes, scales, and accuracies.) The full-scale reading for analog instruments equals, or is a function of, the primary rating of the instrument transformers. For example, a full-scale reading with a 1200:5 current transformer will be 1200 A for a 5 A instrument. If the load current is considerably less than 1200 A, the readings will be less accurate and may be difficult to read. In this example, the user may wish to specify a 2.5 A instrument for better accuracy and ease of reading. Digital instruments normally permit programming the instrument transformer ratio and have low burden. They have higher resolution and accuracy over a wider range. This offers users greater flexibility when specifying instrument transformer ratios and instrument full scale ratings. 11.3.1 Ammeters Ammeters are used to measure the current that flows in a circuit. If the current is less than 5 A, an ammeter is directly connected in the circuit to be measured. If the current is high, the ammeter is connected to a current transformer or to a shunt. Selector switches are often installed so that one ammeter may be connected to any phase or turned off. 11.3.2 Voltmeters Voltmeters are used to measure the potential difference between conductors or terminals. A voltmeter is connected directly across the points between which the potential difference is to be measured. Voltage (potential) transformers are generally required when more than 120 V is monitored. Selector switches are often installed so that one voltmeter may be connected between any phases or turned off. 11.3.3 Wattmeters A wattmeter measures the magnitude of electric power being delivered to a load. Proper application of this instrument requires correct polarity and phasing of both voltage and current. Scale factors for wattmeters typically indicate kilowatts or megawatts. 1The numbers in brackets preceded by the letter B correspond to those in the bibliography in 11.10. 11.3.4 Varmeters A varmeter measures reactive power. Varmeters usually have the zero point at the center of the scale, since reactive power may be leading or lagging. The varmeter has an advantage over a power-factor meter in that the scale is linear; thus small variations in reactive power can be read. Scale factors for varmeters typically indicate kilovars or megavars. 11.3.5 Power-factor meters A power-factor meter indicates the power factor of a load. The meter indicates unity power factor at center scale, leading power factor to the left of center, and lagging power factor to the right of center. Power-factor meters are reasonably accurate only when adequately loaded. When accuracy is desired throughout the load range, a wattmeter and a varmeter should be used in combination. Many power-factor meters can monitor only one phase at a time. This often leads to erroneous conclusions if the phase loads are not similar and if only one reading is taken. The proper selection of a power-factor meter or other instrument intended to monitor multiphase systems depends on the system to be monitored; for example, 3-phase, 3-wire; 3- phase, 4-wire wye; 3-phase, 4-wire delta, etc. 11.3.6 Frequency meters The frequency of an ac power supply can be measured directly by a frequency meter. Two commonly used types are the pointer-indicating and the vibrating-reed. These instruments are connected in the same way as voltmeters. 11.3.7 Synchroscopes A synchroscope shows the phase-angle difference between two systems and is used wherever two generators or systems are to be connected in parallel or where a generator will be operated in parallel with the utility system. A synchroscope has the appearance of a switchboard instrument except that the pointer is free to revolve 360. When the frequency of the system being synchronized is too low, the pointer rotates in one direction; when it is too high, the pointer rotates in the opposite direction. When the frequency is the same, the pointer stands still. When the voltages are equal and the pointer indicates a zero angular difference, the circuits are in phase, and the systems may be safely paralleled. 11.3.8 Elapsed-time meters Elapsed-time meters have a small, synchronous motor that drives cyclometer dials. The dials register the cumulative amount of time a circuit or apparatus is in operation. 5.7 Metal-Enclosed Distribution Switchboards Metal-enclosed distribution switchboards are frequently used in commercial buildings at 600 V and below for service entrance, power, or lighting distribution, and as the secondary sections of unit substations. A wide range of protective devices and single- or multiple-section assemblies are available for large services from 404000 A. While 4000 A equipment is available, the use of smaller services is recommended. NEMA PB2-1989, Deadfront Distribution Switchboards [35] is applicable. Equipment ground-fault protection is recommended when the switchboard is applied on grounded wye systems. It is required on electrical services of more than 150 V to ground for any service disconnecting mean rated 1000 A or more. See the NEC, Article 230-95 [9] for minimum requirements. Automatic transfer between main and emergency sources is generally provided as a complete package with all of the power and control features built into the assembly by the manufacturer in accordance with applicable standards (see 5.18). 5.7.1 Components The following components are available: Service protectors Molded-case circuit breakers, group or individually mounted Fusible switches Motor starters Low-voltage ac power circuit breaker (generally limited to main or tie position) Bolted pressure and high-pressure switches Transfer devices or switches Instrumentation, metering, and relaying Instrumentation and metering include the utility company metering equipment, voltmeters, ammeters, wattmeters, voltage and current transformers, etc. 5.7.2 Construction Features 1) Front Accessible Front Connected Designed to be installed against a wall. All mechanical and electrical connections are made from the front. Multiple-section switchboards have backs lined up. Switchboards are enclosed on all sides except the bottom. Maximum rating of 2000 A. Drawout low-voltage ac power circuit breakers are not available as branch devices. Load-side risers are not available. 2) Rear Accessible Front Connected Designed to be free-standing. Designed for rear accessibility. All main connections are made from the rear. All normal maintenance in the main bus is performed from the rear. All line and load connections for branch devices are made from the front. Cross bus is located behind the branch devices and is accessible only from the rear. Multiple-section switchboards have fronts lined up. Capable of accepting all components. 3) Rear Accessible Rear Connected Designed to be free-standing. Designed for rear accessibility. All main connections are made from the rear. All normal maintenance to the main bus is performed from the rear. All line and load connections for branch devices are made from the rear. All cross bus and line and load connections for branch devices are accessible only from the rear. Multiple-section switchboards have fronts lined up. Capable of accepting all components. Panelboards 5.10 Panelboards Electric systems in commercial buildings usually include panelboards, which utilize fusible or circuit breaker devices, or both. They are generally classified into two categories Lighting and appliance panels Power distribution panels Panelboard mounting of motor starter units may also be involved. NEMA PB 11990, Panelboards [34] and ANSI/UL 67-1988, Panelboards [10] are applicable. 5.10.1 Lighting and Appliance Panelboards These panels have more than 10% of the overcurrent devices rated 30 A or less, for which neutral connections are provided. The number of overcurrent devices (branch-circuit poles) is limited to a maximum of 42 in any one box. When the 42 poles are exceeded, two or more separate boxes are required. A common front for multiple boxes is usually available. Narrow width box constructions are used to fit into a 10 inch or 8 inch structural wide flange beam where mounting of a panelboard on a building column is appropriate. Column extensions and pull boxes are also available for this application. Ratings of these panels are single-phase, two-wire 120 V or three-wire 120/240 V; 120/208 V, three-phase, three-wire 208 V, 240 V, or 480 V; and three-phase, four-wire 208Y/120 V or 480Y/277 V. 5.10.2 Power Distribution Panelboards This type includes all other panelboards not defined as lighting and appliance panelboards. The 42 overcurrent protective device limitation does not apply. However, care should be exercised not to exceed practical physical limitations, such as the standard box heights and widths available. Common fronts for two or more boxes are often impractical from a weight and installation standpoint due to the size of this type of panelboard. Ratings are single-phase, two- or three-wire; three-phase, three- or four-wire; 120/240 V through 600 Vac, 250 Vdc; 501600 A, 1200 A maximum branch. 5.10.3 Motor Starter Panelboards Rather than use an individual mounting, a small number of motor starters can be grouped into a panelboard. Motor starter panelboards consist of combination units utilizing either molded-case or motor circuit protector fusible disconnects. The combination starters are factory wired and assembled. Class A provides no wiring external to the combination starter; Class B provides control wiring to terminal blocks furnished near the side of each unit. When a large number of motors are to be controlled from one location or additional wiring between starters and to master terminal blocks is required, conventional motor control centers (MCCs) are most commonly used. See Chapter 6. for a discussion of MCCs. 5.10.4 Multiple-Section Panelboards Both lighting and appliance panelboards or power distribution panelboards requiring more than one box are called "multiple-section" panelboards. Unless a main overcurrent device is provided in each section, each section should be furnished with a main bus and terminals of the same rating for connection to one feeder. The three methods commonly used for interconnecting multiple-section panelboards are as follows: Gutter Tapping Increased gutter width may be required. Tap devices are not furnished with the panelboard. Subfeeding A second set of main lugs (subfeed) are provided directly beside the main lugs of each panelboard section, except the last in the lineup. Throughfeeding A second set of main lugs (throughfeed) are provided on the main bus at the opposite end from the main lugs of each section, except the last in the lineup. This method has the undesirable feature of allowing the current of the second panelboard section to flow through the main bus of the first section. 5.10.5 Panelboard Data To assist the engineer planning an installation, manufacturers' catalogs provide a wide choice of panelboards for specific applications. Some very important rules governing the application of panelboards are described in the NEC [9]. Six Circuit Rule The NEC, Article 230-7 1 [9] specifies that a device may be suitable for service entrance equipment when not more than six main disconnecting means are provided (except two mains maximum in lighting and appliance branch-circuit panelboards). In addition, a disconnecting means (which need not be a switch) shall be provided for the ground conductor as specified in the NEC, Article 230-75 [9]. Thirty Conductor Rule The NEC, Article 362-5 [9] states that wireways shall not contain more than 30 conductors at any cross section, unless the conductors are for signaling or motor control. It further states that the total cross sectional areas of all the conductors shall not exceed 20% of the internal cross section of the wireway. Column panels or panels fed by a single wireway are limited to three main conductors and 27 branch and neutral conductors (12 circuit panelboard, single-phase, three-wire). When the neutral bar is mounted in a column panel pullbox, this will be changed to two main conductors and 28 branch circuits (28 circuit panelboard). 3) Gutter Tap Rule The NEC, Article 240-2 1 [9] states that overcurrent devices shall be located at the point where the conductor to be protected receives its supply. But many exceptions apply to this rule. For example, exception number 2 to this paragraph permits omission of the main overcurrent device if the tap conductor (a) is not over 10 feet long, (b) is enclosed in a raceway, (c) does not extend beyond the panelboard it supplies, and (d) has an ampacity not less than the combined computed loads supplied and not less than the ampere rating of the switchboard, panelboard, or control device supplied. Gutter taps are permitted under this ruling. Industrial Busway 13.2 Busway construction Originally a busway consisted of bare copper conductors supported on inorganic insulators, such as porcelain, mounted within a nonventilated steel housing. This type of construction was adequate for the current ratings of 225600 A then used. As the use of busways expanded and increased loads demanded higher current ratings, the housing was ventilated to provide better cooling at higher capacities. The bus bars were covered with insulation for safety and to permit closer spacing of bars of opposite polarity in order to achieve lower reactance and voltage drop. In the late 1950s busways were introduced utilizing conduction for heat transfer by placing the insulated conductor in thermal contact with the enclosure. By utilizing conduction, current densities are achieved for totally enclosed busways that are comparable to those previously attained with ventilated busways. Totally enclosed busways of this type have the same current rating regardless of mounting position. Bus configuration may be a stack of one bus bar per phase (0800 A), and higher ratings will use two (3000 A) or three stacks (5000 A). Each stack may contain all three phases, neutral, and grounding conductor to minimize circuit reactance. (See figure 13-1.) Early busway designs required multiple nuts, bolts, and washers to electrically join adjacent sections. Present designs use a single bolt for each stack. Joint connection hardware is captive to the busway section when shipped from the factory. Installation labor is greatly reduced with corresponding savings in installation costs.  Figure 13-1 Typical busway construction Busway conductors and current-carrying parts can be either copper or aluminum or copper alloy rated for the purpose. Compared to copper, electrical grade aluminum has lower conductivity (the minimum for aluminum is 55%; for copper, 97%) and less mechanical strength. Generally, for equal current-carrying ability, aluminum is lighter in weight and less costly. To prevent oxides or insulating film on the surfaces, all contact locations on current-carrying parts are plated with tin or silver (the exception being copper conductors in lighting busways and trolley busways). Power and distribution busways use Belleville springs (concave washers) and bolting practices at the joints to maintain mechanical integrity. Busway is usually manufactured in 10 ft sections. Since the busway must conform to the building structure, all possible combinations of elbows, tees, and crosses are available. Feed and tap fittings to other electric equipment, such as switchboards, transformers, motor-control centers, etc., are available. Plugs for plug-in busway use fusible switches and/or molded-case circuit breakers to protect the feeder or branch circuit. Neutral conductors may be supplied, if required. Four types of busways are available, complete with fittings and accessories, providing a unified and continuous system of enclosed conductors (figure 13-2): Feeder busway for low-impedance and minimum voltage drop for distribution of power as needed; Plug-in busway for easy connection or rearrangement of loads; Lighting busway to provide electric power and mechanical support for lighting or small loads; Trolley busway for mobile power tapoffs to electric hoists, cranes, portable tools, etc.  Figure 13-2Illustration of versatility of busways, showing use of feeder, plug-in, lighting, and trolley types 13.3 Feeder busway Feeder busway is used to transmit large blocks of power. It has a very low and balanced circuit reactance to minimize voltage drop and sustain voltage at the utilization equipment (figure 13-3). Feeder busway is frequently used between the source of power, such as a distribution transformer or service drop, and the service entrance equipment. Industrial plants use feeder busway from the service equipment to supply large loads directly and to supply smaller current ratings of feeder and plug-in busway, which in turn supply loads through power take-offs or plug-in units. Available current ratings range from 6005000 A, 600 Vac or Vdc. By paralleling runs, higher ratings can be achieved. The manufacturer should be consulted for dc ratings. Feeder busway is available in single-phase and three-phase service with 50% and 100% neutral conductor. A grounding bus is available with all ratings and types. Available short-circuit current ratings are 42 000200 000 A, symmetrical rms (see 13.8.2). The voltage drop of low-impedance feeder busway with the entire load at the end of the run ranges from 13 V/100 ft, line-to-line, depending upon the type of construction and the current rating (see 13.8.3). Feeder busway is available in indoor and outdoor construction. Outdoor construction is designed so that exposure to the weather will not interfere with successful operation (see  Figure 13-3Feeder busway NEMA BU 1-1988).1 Outdoor busway also can be used for indoor applications where similar adverse conditions might prevail. No busway is suitable for immersion in water or to be solidly entrenched. 13.4 Plug-in busway Plug-in busway is used in industrial plants as an overhead system to supply power to utilization equipment. Plug-in busway provides tapoff provisions at regular intervals (approximately every 2 ft) over the length of the run to allow safe connection of a switch or circuit breaker to the busway. Load side cable connections can then be short and direct. Plug-in tapoffs (bus plugs) can be connected to their loads by conduit and wire or flexible bus drop cable. Bus plugs can be removed, relocated, and reused. The use of flexible cable permits the bus plug and machine it serves to be relocated and put back into service in a minimum of time (see figure 13-4). 1Information on references can be found in 13.13.  Figure 13-4Machine installation using a busway feeder Bus plugs are available in several types. They include fusible switches, circuit breakers, static voltage protectors (potentializer), ground detectors (indicating), combination motor starters and lighting contactors, transformers, and capacitor plugs. Many can be equipped with additional accessories, such as control power transformers, relays, indicating lights (blown fuse), and terminal blocks for remote control and indication. Busway is totally enclosed and can be of the ventilated or non-ventilated design. Plug-in busways have current ratings ranging from 1005000 A. Plug-in and feeder busway sections of the same manufacturers above 600 A are usually of compatible design and are interchangeable, allowing for a section of plug-in to be installed in a feeder run where tapoffs are desired. Bus plugs are generally limited to maximum ratings of 800 A for fused-switch type plugs and 1200 A for circuit-breaker type plugs. Short-circuit current ratings vary from 10 000200 000 A symmetrical rms (see 13.8.2). The voltage drop ranges are approximately from 13 V/100 ft, line-to-line, for evenly distributed loading. If the entire load is concentrated at the end of the run, these values double (see 13.8.3). A neutral bar may be provided for single-phase loads such as lighting. Neutral bars usually are of the same capacity as the phase bars. The bus housing may be used as an equipment grounding path. However, grounding bus bar is often added for greater system protection and coordination under ground fault conditions. The grounding bus bar provides a low-impedance ground path and reduces the possibility of arcing at the joint under high-level ground faults if the housing is used as a ground path. (See 13.8.2 for additional details.) 13.5 Lighting busway Lighting busway is rated a maximum of 60 A, 300 V-to-ground, with two, three, or four conductors. It may be used on 480Y/277 V or 208Y/120 V systems and is specifically designed for use with fluorescent and high-intensity discharge lighting (figure 13-5).  Figure 13-5Example of lighting busway Tapoffs for lighting busway are available in various types and include those with built-in cir cuit protection by either fuse or circuit breaker. Accessories include special mounting brack ets and tapoffs for surface or close coupling attachment of fluorescent lighting fixtures to the busway. Lighting busway can be surface-mounted, recessed in dropped ceilings, or suspended from drop rods. Hangers are available to accommodate each method. Lighting busways provide power to the lighting fixture and also serve as the mechanical support for the fixture. Auxiliary supporting means called strength beams are available for increasing supporting intervals. The strength beams provide supports for the lighting busway as required by the National Electrical Code (NEC) (ANSI/NFPA 70-1993). Lighting busway is also used to provide power for light industrial applications. 13.6 Trolley busway Trolley busway is constructed to receive stationary or movable take-off devices to power overhead cranes, monorail systems, industrial doors, and conveyor lines. Trolley busways are not suitable for outdoor application. They are used on a moving production line to supply electric power to a motor or a portable tool moving with a production line, or where operators move back and forth to perform their specific operations. Trolley busway is available in current ratings ranging from 60800 A, up to 600 V ac or dc, and 3, 4, and 5 wire. The steel casing serves as the ground. Tapoffs (moving trolleys) range from 15200 A and can be equipped with circuit breakers, fusible protection, starters, contactors, and relays. Depending on manufacturer's recommendations, trolleys can support hanging loads of up to 30 lbs. Both horizontal and vertical curves are available, as well as isolation sections, end ramps, and switching sections. 13.8 Selection and application of busways To apply busways properly in an electric power distribution system, some of the more important items to consider are the following. 13.8.1 Current-carrying capacity Busways should be rated on a temperature-rise basis to provide safe operation, long life, and reliable service. Conductor size (cross-sectional area) should not be used as the sole criterion for specifying busway. Busway may have seemingly adequate cross-sectional area and yet have a dangerously high temperature rise. The UL requirement for temperature rise (55 C) (see ANSI/UL 857-1989) should be used to specify the maximum temperature rise permitted. Larger cross- sectional areas can be used to provide lower voltage drop and temperature rise. Although the temperature rise will not vary significantly with changes in ambient temperature, it may be a significant factor in the life of the busway. The limiting factor in most busway designs is the insulation life, and there is a wide range of types of insulating materials used by various manufacturers. If the ambient temperature exceeds 40 C or a total temperature in excess of 95 C is expected, then the manufacturer should be consulted. 13.8.2 Short-circuit current rating The bus bars in busways may be subject to electromagnetic forces of considerable magnitude by a short-circuit current. The generated force per unit length of bus bar is directly proportional to the square of the short-circuit current and is inversely proportional to the spacing between bus bars. Short-circuit current ratings are generally assigned in accordance with ANSI/NEMA BU1-1988 and tested in accordance with ANSI/UL 857-1989. The ratings are based on (1) the use of an adequately rated protective device ahead of the busway that will clear the short circuit in 3 cycles and (2) application in a system with short-circuit power factor not less than that given in table 13-1. Table 13-1 Busway ratings as a function of short-circuit power factor Busway rating (symmetrical rms amperes)Power factorX/R ratio*10 000 or less0.501.710 00120 0000.303.2Above 20 0000.204.9 *X/R is load reactance X divided by load resistance R. If the system on which the busway is to be applied has a lower short-circuit power factor (larger X/R ratio), the short-circuit current rating of the bus may have to be increased. The manufacturer should then be consulted. The required short-circuit current rating should be determined by calculating the available short-circuit current and X/R ratio at the point where the input end of the busway is to be connected. The short-circuit current rating of the busway must equal or exceed the available short-circuit current. The short-circuit current may be reduced by using a current- limiting fuse or circuit breaker at the supply end of the busway to cut it off before it reaches maximum value (see Chapter 5). Short-circuit current ratings are dependent on many factors, such as bus bar center line spacing, size, strength of bus bars, and mechanical supports. Since the ratings are different for each design of busway, the manufacturer should be consulted for specific ratings. Short-circuit current ratings should include the ability of the ground return path (housing and ground bar if provided) to carry the rated short-circuit current. Failure of the ground return path to adequately carry this current can result in arcing at joints, creating a fire hazard. The ground-fault current can also be reduced to the point that the overcurrent protective device does not operate. Bus plugs and attachment accessories also should have adequate short-circuit interrupting and/or withstand ratings. 13.8.3 Voltage drop Line-to-neutral voltage drop V in busways may be calculated by the following formulas. D The exact formulas for concentrated loads at the end of the line are, with VR known, VD = (VRcos+IR)2+(VRsin+IX)2VR and with V S known, VD = VS+IRcos+IXsin VS2 (IXcosIRsin)2 where ZL VR VS = ----- , V D = VSVR ZS Multiply the line-to-neutral voltage drop by to obtain the line-to-line voltage drop in 3 three-phase systems. Multiply the line-to-neutral voltage drop by 2 to obtain the line-to-line voltage drop in single-phase systems. The approximate formulas for concentrated loads at the end of the line are as follows: VD = I(Rcos+Xsin) S ( R cos + X sin ) V pr = 2 10 Vk The approximate formula for distributed load on a line is as follows: S ( R cos + X sin ) V pr = 2 10 Vk# # L1 # # 1 ----- 2L where V is the voltage drop, in volts D V pr is the voltage drop, in percent of voltage at sending end V is the line-to-neutral voltage at sending end, in volts S V is the line-to-neutral voltage at receiving end, in volts R  is the angle whose cosine is the load power factor R is the resistance of circuit, in ohms per phase X is the reactance of circuit, in ohms per phase I is the load current, in amperes Z is the load impedance, in ohms L Z is the circuit impedance, in ohms, plus load impedance, in ohms, added vectorially S S is the three-phase apparent power for three-phase circuits or single-phase apparent power for single-phase circuits, in kilovoltamperes V is the line-to-line voltage, in kilovolts k L is the distance from source to desired point, in feet 1 L is the total length of line, in feet The foregoing formulas for concentrated loads may be verified by a trigonometric analysis of figure 13-6. From this figure it can be seen that the approximate formulas are sufficiently accurate for practical purposes. In practical cases the angle between V will be small R and V S (much smaller than in figure 13-6, which has been exaggerated for illustrative purposes). The error in the approximate formulas diminishes as the angle between V decreases and R and V S is zero if that angle is zero. This latter condition will exist when the X/R ratio (or power factor) of the load is equal to the X/R ratio (or power factor) of the circuit through which the load current is flowing.  Figure 13-6Diagram illustrating voltage drop and indicating error when approximate voltage-drop formulas are used In actual practice, loads may be concentrated at various locations along the feeders, uniformly distributed along the feeder, or any combination of the same. A comparison of the approximate formulas for concentrated end loading and uniform loading will show that a uniformly loaded line will exhibit one-half the voltage drop as that due to the same total load concentrated at the end of the line. This aspect of the approximate formula is mathematically exact and entails no approximation. Therefore, in calculations of composite loading involving approximately uniformly loaded sections and concentrated loads, the uniformly loaded sections may be treated as end-loaded sections having one-half normal voltage drop of the same total load. Thus, the load can be divided into a number of concentrated loads distributed at various distances along the line. The voltage drop in each section may then be calculated for the load that it carries. Three-phase voltage drops may be determined with reasonable accuracy by the use of tables 13-2 and 13-3. These are typical values for the sandwich-type design of busway. The voltage drops will be different for other types of busway and will vary by manufacturer within each type. The voltage drop shown is three-phase, line-to-line, per 100 ft at rated load on a concentrated loading basis for feeder, plug-in, and trolley busway. Lighting busway values are single-phase, distributed loading. For other loading and distances use the following formula: voltage drop V D table V D actual load = " " rated loadactual distance (feet)100 ft The voltage drop for a single-phase load connected to a three-phase busway is 15.5% higher than the value shown in the tables. Typical values of resistance and reactance are shown in table 13-4. Resistance is shown at normal room temperature (25 C). This value should be Table 13-2-Voltage-drop values for three-phase sandwiched busways with copper bus bars, in V/1 00 ft, line-to-line, at rated current with concentrated load* Current rating (amperes)Load power factor (percent, lagging)20304050607080901006002.142.452.672.863.043.183.283.302.868002.172.472.672.853.003.123.193.172.6910002.012.322.522.702.852.983.063.062.6412001.792.102.282.452.592.712.792.792.4113501.862.142.322.482.622.732.812.812.4116001.942.162.352.512.642.752.822.802.6420002.082.232.402.562.692.792.852.832.39`25001.851.972.132.262.392.472.532.512.1130001.962.152.322.462.592.692.742.732.3040001.862.062.242.392.522.632.692.682.2950001.851.972.132.262.372.462.512.492.09 NOTE-These are average values for four major manufacturers of sandwiched busway. Voltage- drop values are based on bus-bar resistance at 75 C (ambient temperature of 25 C plus average conductor temperature at full load of 50 C rise). *Divide values by 2 for distributed loading. used in calculating the short-circuit current available in systems, since short circuits can occur when busway is lightly loaded or initially energized. To calculate the voltage drop when fully loaded (75 C), the resistance of copper and aluminum should be multiplied by 1.19. 13.8.4 Thermal expansion As load is increased, the bus-bar temperature will increase and the bus bars will expand. The lengthwise expansion between no load and full load will range from 1/2 to 1 in/100 ft. The amount of expansion will depend on the total load, size, and location of the tapoffs, and the size and duration of varying loads. To accommodate the expansion, the busway should be mounted using hangers that permit it to move. It may be necessary to insert expansion lengths in the busway run. To locate expansion lengths, the method of support, the location of power Table 13-3-Voltage-drop values for three-phase sandwiched busways with aluminum bus bars, in V/1 00 ft, line-to-line, at rated current with concentrated load* Current rating (amperes)Load power factor (percent, lagging)20304050607080901006001.912.352.712.953.223.463.673.823.628001.852.132.402.672.913.133.323.463.2710001.692.042.332.602.863.093.293.453.2112001.712.032.312.572.813.043.233.373.2113501.571.822.082.312.532.742.913.042.9016001.711.952.202.432.652.843.003.112.9320001.731.962.202.432.642.832.993.092.8825001.671.962.212.452.662.853.013.122.9230001.631.922.162.392.602.792.953.052.8640001.741.942.182.392.602.772.903.002.78 NOTE-These are average values for four major manufacturers of sandwiched busway. Voltage- drop values are based on bus-bar resistance at 75 C (ambient temperature of 25 C plus average conductor temperature at full load of 50 C rise). *Divide values by 2 for distributed loading. take-offs, the degree of movement permissible at each end of the run, and the orientation of the busway must be known. The manufacturer can then make recommendations as to the location and number of expansion lengths. 13.8.5 Building expansion joints Busway, when crossing a building expansion joint, must include provision for accommodating movement of the building structure. Fittings providing for up to 3 in of movement are available. 13.8.6 Welding loads The busway and the plug-in device must be properly sized when plug-in busway is used to supply power to welding loads. The plug sliding contacts (stabs) and protective device (cir cuit breaker or fused switch) should have sufficient rating to carry both the continuous and Table 13-4Typical busway parameters, line-to-neutral, in m/100 ft, 25 C Current rating (amperes)AluminumCopperRXRX6002.9821.282.331.578002.000.801.631.2510001.600.641.270.9212001.290.550.970.6913501.030.440.860.6316000.890.380.720.5520000.700.320.580.4625000.570.260.410.3230000.460.210.370.2940000.340.160.280.2150000.200.16 NOTEResistance values increase as temperature increases. Reactance values are not affected by temperature. The above values are based on conductor temperature of 25 C (normal room temperature) since short circuits may occur when busway is initially energized or lightly loaded. To convert values to fully loaded (75 C), multiply resistance of copper or aluminum by 1.19. peak welding load. This is normally done by determining the equivalent continuous current of the welder based on the maximum peak welder current, the duration of the welder current, and the duty cycle. Values may be obtained from the welder manufacturer. Loads 600 A and greater require special attention including consideration of bolted taps. 8.15 Busway Busways originated as a result of a request from the automotive industry in Detroit in the late '20s for an overhead wiring system that would simplify electrical connections for electric motor driven machines and permit a convenient arrangement of these machines in production lines. From this beginning, busways have grown to become an integral part of the low-voltage electric distribution system for industrial plants at 600 V and below. Busways are particularly advantageous when numerous current taps are required. Plugs with circuit breakers or fusible switches may be installed and wired without de-energizing the busway. Power circuits over 1000 A are usually more economical and require less space with busways than with conduit and wire. Busways may be dismantled and reinstalled in whole or in part to accommodate changes in the electric distribution system layout. Automatic Transfer Equipment Transfer switches NEMA standards define an automatic transfer switch (ATS) as self-acting equipment for transferring one or more load connections from one power source to another. The switch automatically retransfers the load back to the normal source when it is restored. Because of its crucial role in the reliability of the electrical system, the transfer switch should be a highly reliable device with a long life and minimum maintenance requirements. Transfer switches for health care facilities should be appropriate in terms of the following: a) Types of load to be transferred b) Voltage rating c) Continuous current rating d) Overload and fault current withstand ratings e) Type of overcurrent protective device ahead of the transfer switch f) Source monitoring g) Time delays such as on transfer or transfer-back h) Input/output control signals i) Main switching mechanism j) Ground-fault protection considerations k) System operation l) Bypass/isolation switches m) Nonautomatic transfer switches operation n) Multiple transfer switches vs. one large transfer switch per system o) Need to transfer system neutral Voltage ratings An ATS is unique in the electrical distribution system in that two unsynchronized power sources connect to it. This means that the voltages impressed on the insulation may actually be as high as 960 V on a 480 V ac system. A properly designed transfer switch should provide sufficient spacings and insulation to meet these increased voltage stresses. For this reason, the electrical spacing on a transfer switch should not be less than those shown in UL 1008 (Table 22.1), regardless of what type of component may be used as part of the transfer switch. NEMA ICS 10 standard voltage ratings of ATSs are normally 120V, 208V, 240V, 480V, or 600 V, single or polyphase. The standard frequency is 60 Hz. ATSs can also be supplied for other voltages and frequencies when required for dc and international applications. Continuous current rating Transfer switches differ from other emergency equipment in that they continuously carry the current to critical loads, while engine generators supply power only during emergency periods. Current flows continuously through the transfer switch whether the switch is in the normal or the emergency position. ATSs are available in continuous ratings ranging from 30 A to 4000 A. Most transfer switches are capable of carrying 100% of rated current at an ambient temperature of 40 C. However, some transfer switches, such as those incorporating integral overcurrent protective devices, may be limited to a continuous load current not to exceed 80% of the switch rating. Engineers need to size transfer switches based on the maximum continuous load current the switch will carry. Momentary inrushes, such as occur when lighting or motor loads are energized, can be ignored provided that the switch is UL 1008, total systems load rated. For new projects, the engineer may specify a transfer switch that will be able to carry future anticipated loads. In such cases, the switch should have a continuous current rating equal to the future total anticipated load. Overload and fault current withstand ratings Transfer switches are often subjected to currents of short duration that exceed the continuous duty ratings. The ability of the transfer switch to handle higher currents is measured by its overload and fault current withstand ratings. Additional information on overload ratings and fault current withstand ratings can be found in Chapter 3. Protective device ahead of transfer switch The type and size of the overcurrent device ahead of the transfer switch plays a significant role in transfer switch application. Refer to Chapter 3 for a discussion on coordinating the protective device and the transfer switch. Protective devices should be coordinated throughout the system so that a fault is cleared by the device nearest to the fault, thereby minimizing load disruption. Time delays Time delays operate to prevent the ATS from unnecessary starting and transfer to the alternate supply. An adjustable momentary outage time delay will override momentary interruptions and reductions in normal source voltage but will allow starting and transfer if the reduction or outage is sustained. The time delay is generally 1 s, but may be set higher if line-side automatic throwover arrangements and reclosers on the high lines take longer to operate, or if expected momentary power dips frequently exceed 1 s. If long delay settings are used, ensure that sufficient time remains to meet the 10s power restoration requirements. Once the load transfers to the alternate source, another timer delays retransfer to the normal source until that source has time to stabilize. Preferred source voltage monitors in the ATS control this delay, which is adjustable from 0 min to 30 min. Most facilities set their retransfer at 30 min. Another important function of the retransfer timer is to allow the engine generator set to operate under a load for a preselected minimum time to drive out moisture and ensure continued good performance of the set and its cranking system. This delay should be automatically bypassed if the alternate source fails and the normal source is available as determined by the voltage monitors. Engine generator set manufacturers often recommend a cool-down period following retransfer to the normal source. A third time delay, usually 5 min, provides this operation. The delay helps to prevent inadvertent high water temperature alarm and lockout when the set shuts down. Running an unloaded engine for more than 5 min can cause deterioration in engine performance. Some applications may benefit from sequencing the transfer of the loads to the alternate source where more than one ATS is connected to the same engine generator. Such a sequencing scheme can reduce starting kilovoltampere capacity requirements of the generator. A fourth timer, adjustable from 0 min to 5 min, will delay transfer to the alternate source for this and other similar requirements. NFPA 99 requires the delay on certain equipment system loads. Input/output control signals When the transfer switch control panel detects a sustained failure of the normal source, a set of contacts, one normally open and one normally closed, operates to signal starting of the alternate source generator set. These contacts should be rated to handle the dc voltages encountered on engine automatic starting systems. Additional dry contacts, normally open and normally closed, should be provided on the transfer switch unit for remote annunciation of transfer switch positions and other control functions. Main switching mechanism The main switching mechanism of a transfer switch should have the following characteristics: a) Electrical operation. The transfer switch should derive control power from the source to which the load is to be transferred. This arrangement ensures an adequate source of power for switch operation. b) Mechanically held. Electrically held transfer switches are limited in size, will drop out and disconnect the load if the main coil fails, and have very low fault current withstand ability. Mechanically held mechanisms are not limited in size, will not drop out, and can withstand higher fault currents. c) Mechanically interlockeddouble-throw. Normally, the switch mechanism should be of the mechanically interlocked double-throw-type, permitting only two possible positionsclosed on normal or closed on emergency. If the interlocking permits both sets of contacts to close at the same time, a system-to-system short circuit can occur. Exceptions are made for closed transition schemes. Bypass/isolation switches for automatic transfer switches In many health care facilities, it is difficult to perform regular testing or detailed inspections on the emergency system because some or all of the loads connected to the system are vital to human life. De-energizing these loads for any length of time is difficult. This situation results in a lack of maintenance. In such installations, a bypass switch in the ATS can bypass the critical loads directly to a reliable source of power without downtime. The transfer switch can then be isolated for safe inspection and maintenance. These switches can perform the following three functions: a) Shunt the service around the transfer switch without interrupting power to the load. b) Allow the transfer switch to be tested without interruption of power to the load. c) Electrically isolate the transfer switch from both sources of power and load conductors to permit the inspection and maintenance of all transfer switch components. These functions are accomplished by operating two handles in an easy-to-follow sequence. The equipment can be furnished as a complete automatic transfer and bypass/isolation switch for new installations, or as a replacement for existing equipment. Some arrangements can be supplied with a drawout mechanism so that the transfer switch can be easily removed for maintenance.  Typical automatic transfer and two-way bypass/isolation switch In addition to the two-way switches, one-way switches can bypass to only one preselected source. Two-way bypass/isolation switches allow either power source to be selected to feed the load during bypass. The operator can choose the source that is the more dependable at that time. Furthermore, when the transfer switch is in the test or open position, a two-way bypass/isolation switch can be used to transfer the load to the alternate source if the source to which it has been bypassed fails. (See Figure 5-12.) One-way devices cannot provide these features. Nonautomatic transfer switches Authorities having jurisdiction (AHJs) may sometimes permit nonautomatic transfer switches for certain code-defined portions of the equipment system load and for various nonessential loads. For these installations operating personnel operate the switch and engineers should only use them for loads that do not require immediate automatic restoration of power. The NEC requires that a portable or temporary alternate source of power be made available whenever the emergency generator is out of service for major maintenance or repair. How this is to be accomplished is left up to the system designer. Whatever approach is used, it should be in accordance with standard practice and equipment for emergency use. One suggestion might be to use a nonautomatic transfer switch. Devices used as nonautomatic transfer switches should have the same electrical characteristics, rating, and features as an ATS. Operators open and close these switches either through an externally operable manual operating handle or by electrical remote push-button control. Multiple transfer switches vs. one large transfer switch In small hospitals and nursing homes with a maximum demand of 150 kVA on the essential electrical system, the NEC permits one large transfer switch rather than multiple branch transfer switches. The engineer should consider the following in determining the best approach: a) One single large ATS close to the incoming service controlling the entire emergency load, in lieu of individual ATSs in each branch of the emergency system, may reduce the overall reliability and design flexibility of the system. Locating the transfer switches as close to the loads as possible provides the maximum protection. When closer to the loads, the ATSs monitor the utility and generator power supplies but also the power circuit conductors to the switch. b) Maximizing physical isolation of the separate branches and feeders in the essential electrical system may be accomplished by using separate transfer switches in each feeder. Separate transfer switches, in each of the essential load feeders, increase total system reliability because separation of the conductors is maintained all the way back to the utility and generator main distribution switchboards. If one large transfer switch were used, it might require a long power conductor run downstream of the switch. If something happened to this one conductor or the single ATS, the complete essential electrical system would be shut down, whereas with the multiple ATS approach, only one branch of the system would be affected. c) Where a system needs sequential load transfer, more numerous, smaller transfer switches are much easier on the system than fewer larger ones. d) Using fewer larger switches is, however, usually a less costly design. When branch circuits on the load side of the transfer switch are required to be extra reliable because they are life sustaining, consider area protection relays. These relays can sense failures at the load side of the individual panelboard overcurrent devices or directly at the point of utilization. Such relays can signal for remedial action when overcurrent device opening (inadvertent, mechanical failure, or overcurrent tripping), circuit wiring failure, equipment failure, or unintentional equipment disconnection occurs. Ground-fault protection considerations Ground-fault protection of electrical systems that have more than one power source (e.g., a load supplied by a utility and engine generator set) requires special consideration. When the neutral conductor of the engine generator set is grounded at the generator location, the transfer must also switch the neutral to avoid creating multiple neutral-to-ground connections. Without this kind of design, the system will be prone to improper sensing of ground-fault currents and nuisance tripping of overcurrent devices. Motor Control Centers and Motor Controllers Motor control equipment (Red 10.6) General discussion (Red 10.6) The majority of motors utilized by industrial firms are integral horsepower induction motors of squirrel-cage design supplied from distribution systems of three-phase 600 Vac and below. The choice of an integral horsepower controller depends on a number of factors: Power system. Does it use dc or ac; is it single-phase or three-phase? What is the voltage and frequency? Will the system permit large inrush currents during full- voltage starting without excessive voltage drop? Motor. Is the controller to be used with dc, squirrel-cage induction, wound-rotor induction, synchronous motor, or adjustable frequency drives? What is the horsepower? Will the motor be jogged or reversed frequently? What is the acceleration time from start to full speed? Will the motor design specify reduced current inrush? Load. Is the load geared, belt-driven, or direct-coupled? Loaded or unloaded start? Operation. Is operation to be manual or automatic? Protection. Are fuses or circuit protectors to be used for short-circuit protection? To size the elements of motor overload relays, the full-load current of the motor, the ambient temperature at the motor, controller, and the service factor of the motor should be known. Environment. Will the motor and controller be subjected to excessive vibration, dirt, dust, oil, or water? Will either be located in a hazardous or corrosive area? Cable connections and space. Will there be the required space for cable entrance, bending radius, terminations, and for reliable connections to line and load buses? Will capacitors be installed at the motor terminal box for power factor correction? Will surge-protective equipment, surge arresters, and capacitors, be installed at the motor terminal box? Will current transformers for motor differential protection be installed at the motor terminal box? To answer these questions for proper application of motor controllers, the specifying engineer should seek the assistance of the application engineers from the utility and manufacturers. In addition, process engineers and operating personnel associated with the installation should be consulted. Starters over 600 V (Red 10.6) Starters for motors from 230013 200 V are designed as integrated complete units based on maximum horsepower ratings for use with squirrel-cage, wound-rotor, synchronous, and multispeed motors for full- or reduced-voltage starting. Alternating current magnetic-fused type starters, NEMA class E2 (see NEMA ICS 2-1988 [B45], employ current-limiting power fuses and contactors. Each starter will be completely self-contained and prewired, with all components in place. Air-break contactors will be current-rated based on motor horsepower requirements. Combination starters will provide an interrupting fault capacity of 260 MVA symmetrical on a 2300 V system, and 520 MVA symmetrical on a 4160 or 4800 V system. This starter will conform to NEMA ICS 2-1988, class E2 controllers, and applicable IEEE and ANSI standards. There is also a UL listing standard on this equipment. Combinations of motor controllers and switchgear are available as assemblies. Starters are available with air- break contactors or vacuum contactors. Starters 600 V and below (Red 10.6) NEMA ICS 2-1988 [B45] summarizes the NEMA standard for magnetic controller ratings of 115 through 575 V. In ac motor starters, contactors are generally used for controlling the circuit to the motor. Starters should be carefully applied on circuits and in combination with associated short-circuit protective devices (circuit breakers, motor circuit protectors, or fusible disconnects) that will limit the available fault current and the let-through energy to a level the starter can safely withstand. These withstand ratings should be in accordance with ANSI/UL 508-1988 [B 17], NEMA ICS 1-1988 [B44], and NEMA ICS 2-1988 [B45], which cover industrial controls, systems, and devices. Some of the common motor-starting devices of 600 V and below that are used in industry are presented in the following subclauses. Combination across-the-line starter (Red 10.6) Magnetic, nonreversing. For full-voltage starting of polyphase motors. It provides motor overcurrent protection with thermal overload relays. Available with an unfused disconnect; provides short-circuit protection when specified with a fusible disconnect or circuit breaker. The available fault current must be considered before deciding which fuses or circuit breakers will be used. The magnetic contactor provides a level of undervoltage protection and is suitable for remote control. Magnetic, reversing. Same as reversing starter, except equipped with nonfusible disconnect, fusible disconnect, or circuit breaker. Reduced voltage starter (Red 10.6) Autotransformer, manual. For limiting starting current and torque on polyphase induction motors to comply with power supply regulations or to avoid excessive shock to the driven machine, or to limit excessive voltage drop. Overload and under- voltage protection are provided. Equipped with mechanical interlock to assure proper starting sequence. Taps are provided on the autotransformer for adjusting starting torque and current. Since the autotransformer controller reduces the voltage by transformation, the starting torque of the motor will vary almost directly as does the line current, even though the motor current is reduced directly with the voltage impressed on the motor. Autotransformers, magnetic. Same as manual, but suitable for remote control. It has a timing relay for adjustment of time at which full voltage is applied. To overcome the objection of the open-circuit transition associated with an auto transformer starter, a circuit known as the Korndorfer connection is in common use. This type of starter requires a two-pole and a three-pole start contactor. The two-pole contactor opens first on the transition from start to run, opening the connections to the neutral of the autotransformer. The windings of the transformer are then momentarily used as series reactors during the transfer, allowing a closed-circuit transition. Although it is somewhat more complicated, this type of starter is frequently used on high-inertia centrifugal compressors to obtain the advantages of low line-current surges and closed-circuit transition. Primary resistor or reactor type. Automatic reduced voltage starter designed for geared or belted drive where sudden application of full-voltage torque must be avoided. Inrush current is limited by the value of the resistor or reactor; starting torque is a function of the square of the applied voltage. Therefore, if the initial voltage is reduced to 50%, the starting torque of the motor will be 25% of its full-voltage starting torque. A compromise must be made between the required starting torque and the inrush current allowed on the system. It provides both overload and under- voltage protection and is suitable for remote control. The resistor or reactor is shorted out as speed approaches rated rpm. Part winding type. Used on light or low-inertia loads where the power system requires limitations on the increments of current inrush. It consists of two magnetic starters, each selected for one of the two motor windings, and a time-delay relay con trolling the time at which the second winding is energized. It provides overload and undervoltage protection and is suitable for remote control. Wye-delta type (also known as star-delta). This type of starter is most applicable to starting motors that drive high-inertia loads with resulting long acceleration times. When the motor has accelerated on the wye (or star) connection, it is automatically reconnected by contactors for normal delta operation. This type of starter requires 6 motor leads. In selecting the type of reduced-voltage starter, consideration should be given to the motor control transition from starting to running. In a closed-circuit transition, power to the motor is not interrupted during the starting sequence, whereas on open-circuit transition it is interrupted. Closed-circuit transition is recommended for all applications to minimize inrush voltage disturbances. A comparison of starting currents and torques produced by various kinds of reduced-voltage starters is shown in table 10-17. Slip-ring motor controller (Red 10.6) The wound-rotor or slip-ring motor functions in the same manner as the squirrel-cage motor, except that the rotor windings are connected through slip rings and brushes to external circuits with resistance to vary motor speed. Increasing the resistance in the rotor circuit reduces motor speed and decreasing the resistance increases motor speed. Some variation of this type controller employs thyristors in place of contactors and resistors. Some even rectify the secondary current and invert it to line frequency to supply back into the input, raising the efficiency appreciably. Multispeed controller (Red 10.6) These controllers are designed for the automatic control of two-, three-, or four-speed squirrel-cage motors of either the consequent-pole or separate-winding types. They are available for constant-horsepower, constant-torque, or variable-torque three-phase motors used on fans, blowers, refrigeration compressors, and similar machinery. Solid-state reduced-voltage motor starter (Red 10.6) Introduction. Solid-state motor starters can control the starting cycle and provide reduced voltage starting for standard ac squirrel-cage motors. Solid-state control electronics combined with power thyristors ensure long life, low maintenance, and eliminate burnout of parts, such as power contacts and ac coils associated with electromechanical starters. They provide an adjustable, controlled acceleration and eliminate high power demands during starting. In some applications, other types of power semiconductors can be utilized. These starters are available in standard models for motors rated from fractional horsepower to 1000 hp. Principle of a solid-state motor starter. One type of reduced-voltage motor starter uses six thyristors in a full-wave configuration to vary the input voltage from zero to full on, so that the motor accelerates smoothly from zero to full running speed. The thyristors are activated by an electronic control section that has an initial step voltage adjustment. This adjustment, combined with a ramped voltage and current-limit override, provides constant current (torque) to the motor until it reaches full speed. Table 10-17Comparison of different reduced voltage starters Autotransformer*Primary resistor or reactorPart windingtWye delta50% Tap65% Tap80% Tap65% Tap80% Tap2-step3-stepStarting current drawn from line as percentage of that which would be drawn upon full- voltage starting28%45%67%65%80%60%25%331/3%Starting torque devel- oped as percentage of25%42%64%42%64%50%12 1 / 2 %1 33 / 3 %Increases slightly with speedIncreases greatly with speedthat which would be developed on full- voltage startingSmoothness ofSecond in order ofSmoothness ofFourth in orderThird inaccelerationsmoothnessreduced-voltageof smoothnessorder oftypes. As motor gainssmoothnessspeed, currentdecreases. Voltagedrop across resistordecreases and motorterminal voltage increases.Starting current andAdjustable within lim-Adjustable withinFixedtorque adjustmentits of various tapslimits of various taps *Closed transition. tApproximate values only. Exact values can be obtained from motor manufacturer. Full-voltage start usually draws between 500 and 600% of full-load current. Variations in the design of starting circuit are as follows: Three power diodes replace the three return conducting thyristors. The control circuit is simple and each thyristor is protected against reverse voltage by its associated diode. This half-wave configuration could produce harmonics that generate added heat in the motor windings. Thermal protective devices should be properly sized to prevent this additional heat from damaging the motor. Thyristors are used only during the starting phase. At full voltage, a run contactor closes and the circuit operates as a conventional electromechanical starter. A starter with linear-timed acceleration uses a closed-loop feedback system to maintain the motor acceleration at a constant rate. The required feedback signal is provided by a dc tachometer coupled to the motor. Starter performance comparison: The solid-state reduced-voltage motor starter maintains a constant level of kilovoltamperes and reduces sudden torque surges to the motor. The current limiter, in conjunction with the acceleration ramp, holds the current constant at a preset level during the start-up period. When the start cycle is complete, the motor is running at almost full voltage with, essentially, a pure sine wave in each phase. Controller for dc motors (Red 10.6) These motors have favorable speed-torque characteristics, and their speed is easily controlled. Reduced voltage starting is accomplished by inserting a resistance in series with the armature winding. As counter electromagnetic force builds up in the armature, the external starting resistance can be gradually reduced and then removed as the motor comes up to speed. Speed control of dc motors can be accomplished by varying resistance in the shunt or series fields or in the armature circuit. Motor control center (Red 10.6) Most centers are tailor-made assemblies of conveniently grouped control equipment primarily used for power distribution and associated control of motors. They contain all necessary buses, incoming line facilities, and safety features to afford the maximum in convenience by saving space and labor and by providing adaptability to ever-changing conditions with a minimum of effort and a maximum of safety. NEMA ICS 2-1988 [B45] governs the type of enclosure and wiring; NEMA Type 1, 2, rH, and 12 enclosures are generally available. Wiring of motor-control centers conforms to two NEMA classes and three types. Class I provides for no wiring by the manufacturer between compartments of the center. Class II requires prewiring by the manufacturer with interlocking and other control wiring completed between compartments of the center. With Type A, no terminal blocks are provided; with Type B, all connections within individual compartments are made to terminal blocks; and with Type C, all connections are made to a master terminal block located in the horizontal wiring trough at the top or bottom of the center. The ideal wiring specification for minimum field installation time and labor is NEMA Class II, Type C wiring. The wiring specification most frequently used by industrial contractors is Class I, Type B wiring. Refer to NEMA ICS 2-1988 for definitions of wiring classes and types. NEMA ICS 2-1988 [B45] specifies that a control center shall carry a short-circuit rating defined as the maximum available rms symmetrical current in amperes permissible at line terminals. The available short-circuit current at the line terminals of the motor-control center is computed as the sum of maximum available current of the system at the point of connection and the short-circuit current contribution of the motors connected to the control center. It is common practice by many manufacturers to show only the short-circuit rating of the bus- work on the nameplate. As a result, it is very important to establish the actual rating of the entire unit and, in particular, the plug-in units (that is, circuit breakers, fusible disconnects, starters, etc.), especially for applications where available fault currents exceed 10 000 A. Also, the short-circuit withstand duration of a motor control center is a consideration, depending on the short-circuit operating time of the line-side interrupting device. Control circuits (Red 10.6) Conventional starters of 600 V and below are factory-wired with coils of the lower voltage rating than the phase voltage to the motor. In such cases, control transformers are used to step the voltage down to permit the use of lower voltage coil circuits. Control transformers can be supplied by manufacturers as separate units with provisions for mounting external to the controller, or they can be incorporated in the controller enclosure and wired in with an operating coil of proper voltage rating. Such transformers can be obtained with primary and secondary fused or other approved means to meet code requirements on control-circuit overcurrent protection. Internally protected control-circuit transformers are available at a rating of less than 50 VA. These do no require primary fuses but have a secondary fuse. Selection of the proper control transformer for a controller is a simple matter of matching the characteristics of the control circuit to the specifications of the transformer. The line voltage of the supply to the motor determines the required primary rating of the transformer. The secondary must be rated to provide the desired control-circuit voltage to match the voltage of the contactor operating coil. The continuous secondary current rating of the transformer should be sufficient for the magnetizing current of the operating coil and should also be able to handle the inrush current. In addition, the control transformer should be of sufficient capacity to supply power requirements of control devices associated with the particular control circuit, that is, indicating lamps, relays, timers, etc. Two forms of control, undervoltage release and undervoltage protection, can be provided in the motor starters. In the first, if the voltage drops below a set minimum, or if the control-circuit voltage fails, the contactor will drop out but will reclose as soon as the voltage is restored. With undervoltage protection, low voltage or failure of the control-circuit voltage will cause the contactor to drop out, but the contactor will not reclose upon restoration of voltage. On some occasions it may be desirable to measure the duration of the voltage dip, and unless the undervoltage lasts more than some predetermined time, the motor is not disconnected. This feature is called time-delay undervoltage protection. Overload protection (Red 10.6) Motor starters are equipped with overload relays. These relays have a time-current characteristic to allow for starting inrush current or momentary overloads. The relays may be thermal or electronic. Some existing outdated starters may have magnetic overload relays. In the case of magnetic relays a dashpot is used to provide the time delay. For thermal relays, the time current characteristic is derived from the response of components of the relay to heat generated by a thermal element that simulates the heating of the motor windings due to line current. Electronic overload relays sense motor currents, transform them into logic level signals, and process these signals to simulate motor thermal (I2t) models. Some of these relays offer field selectability for overload class, and communication capabilities for centralized computer control. Electronic overload relays permit field adjustment of overload settings, thereby eliminating the need for individual heater elements calibrated to specific motor currents. Electronic overload relays for larger motors (2300 V and above) are available with many standard and optional motor-protective functions in a singular modular unit, which permit precise protection of motors and allow motors to be utilized very close to their ratings. Protective functions generally available in these electronic relays are motor-timed overload protection, instantaneous overcurrent protection, stator winding overtemperature protection based on resistance temperature detectors (RTDs) embedded in stator windings, motor bearing overtemperature protection based on RTDs placed at motor bearings, load bearing over- temperature protection based on RTDs at load bearings, underload protection, phase reversal protection, and incomplete sequence protection. NEMA ICS 2-1988 [B45] divides overload relays into classes: Classes 30, 20, and 10. The class is defined by the maximum time, in seconds, in which the relay must function on six times its ultimate trip current. (Ultimate trip current is 1.25 times the full-load current for motors having a service factor of 1.15, and 1.15 times the full-load current for motors having a service factor of 1.0). The types of overload relays to be used on a particular application depend on required reliability, type of load, ambient conditions, motor type and size, safety factors, acceleration time, and probability of an overload. Recommended motor protection guidelines are given in Chapter 9 of IEEE Std 242-1986 [B40]. Solid-state control (Red 10.6) Solid-state controls are frequently applied with variable-speed systems, such as pump motor drives. Most solid-state systems consist of these basic sections: the sensor, the programmer, and the adjustable-speed unit. The sensor generates an electric signal proportional to the changing system conditions (pressure, flow, etc.). This dc signal is applied to the programmer. The programmer determines the automatic starting and stopping sequence of each motor and sets the speed range of each adjustable-speed drive. One type of solid-state programmer consists of plug-in, printed-circuit cards and a motherboard. The input signal is applied to the plug-in cards through printed circuits on the motherboard. The card functions are power supply, speed-programming control, sequencing control, and metering. The adjustable-speed unit controls the electric energy to an ac motor to change speed by means of a frequency-control system, a voltage-control system, or an impedance- control system. This unit contains the thyristors (silicon-controlled rectifiers) that provide the power control function to change motor speed. DC Motor Controls (Gray 6.11) DC motors are started by either full voltage or reduced voltage starting methods. Generally, full voltage starting is limited to motors of 2 hp or less because of very high starting currents. Reduced voltage starting is accomplished by inserting a resistance in series with the armature winding. As counter-electromotive force builds up in the armature, the external starting resistance can be gradually reduced and then removed as the motor comes up to speed, either by a current relay or by timers in steps. All resistance should be removed from the circuit as soon as the motor reaches full speed. Motor characteristics and the resistors are different for series and for shunt motors. Speed control of dc motors can be accomplished by varying resistance in the shunt or series fields or in the armature circuit. Reversing is accomplished by reversing the flow of current through either the armature or the field. An increasing number of solid-state dc motor drives are used for adjustable speed applications. In many cases, single- or three-phase ac power is converted to dc because dc motors are easier to regulate than ac motors. Power System Harmonics from Adjustable Speed Motor Controls (Gray 6.15) Both dc and ac adjustable speed drives using solid-state techniques (SCR converters, inverters, or cycloconverters) have nonsinusoidal, square-edged ac input current waveforms. These currents may be considered to contain harmonic frequency components (that is, current components at multiples of power frequency) that propagate through the power system feeding the drive. The effects of this are usually harmless, but can be troublesome. For instance, a harmonic component can excite a resonant condition between a power factor correcting capacitor bank and the inductance of the power system, causing damaging overvoltages to appear at or near the capacitors. In the rare cases when such harmonics problems occur, they can be readily eliminated by such a simple method as changing a capacitor bank rating. Electrical consultants and equipment suppliers can provide valuable advice on the prevention or cure of harmonics problems. Full Voltage Starting Starting (Grey 6.2) The primary function of a motor controller is starting, stopping, and protecting the motor to which it is connected. A magnetically operated contactor connects the motor to the power source. This contactor is designed for a large number of repetitive operations in contrast with the typical circuit breaker application. Energizing its operating coil with a small amount of control power causes it to close its contacts, connecting each line of the motor to the power supply. If the controller is to be the reversing type, two contactors are used to connect the motor with the necessary phase relation for the desired shaft rotation. Full voltage starting of the motor requires only that the contactor connect the motor terminals directly to the distribution system. Starting a squirrel-cage motor from standstill by connecting it directly across the line may allow inrush currents of approximately 500%600% of rated current at a lagging power factor of 35%-50%. The inrush current of motors rated 5 hp and below usually exceeds 600% of the rated current. Small motors, for example, 0.5 hp, may have inrush currents of 10 times full-load motor current. Energy-efficient motors may even draw higher currents. For applications, such as ventilating fans or small pumps, this type of starting is not objectionable. As a result, most of these controllers are full voltage types. However, some applications, such as large compressors for air-conditioning and pumping installations, may require motors as large as several thousand horsepower. For many of the larger motors, the starting inrush current may be great enough to cause voltage dips, which may adversely affect the building's lighting system. Electric utilities also have restrictions on starting currents, so that voltage fluctuations can be held to prescribed limits. Before applying large motors, starting limitations should be checked with the utility. Some type of starting that limits the current may be necessary. Some couplings or driven equipment have limitations on torque that may be safely applied. Such maximum torque limits may require reduced voltage starting. Many kinds of reduced voltage starters are in common use. Figures 5456 show the principles of the most common reduced voltage starters for squirrel-cage motors. In addition, the contactor sequence and control diagrams show the speed versus torque and voltage versus current characteristics of reduced voltage starters. 51ANSI publications are available from the Sales Department of the American National Standards Institute, 11 West 42nd Street, 13th Floor, New York, NY 10036. NEMA publications are available from the National Electrical Manufacturers Association, 2101 L Street, N.W., Washington, DC 20037. Part-Winding Starters (Grey 6.2) Part-winding starting of motors reduces inrush current drawn from the line to about 65% of locked-rotor current and reduces torque to about 42% of full voltage starting torque. This type of starting requires connecting part of the winding to the supply lines for the first step and connecting the balance in an additional step to complete the acceleration. Although special motors can be designed with any division of winding that is practicable, the typical motor used with part-winding starting has two equal windings. Figure 54Principles of the Most Common Reduced Voltage Starters for Squirrel-Cage Motors, Part 1 (The contactor sequence and control diagram show the speed versus torque and voltage versus current characteristics.) The total starting time should be set for about 24 seconds. Due to severe torque dip during the transfer, the transition time should be short and at approximately half-speed. The branch-circuit protection is usually set at 200% of each winding current. Part-winding starters are comparatively low cost but are only used for light starting loads, such as high-speed fans or compressors with relief or unloading valves. Resistor or Reactor Starters (Grey 6.2) The simplest reduced voltage starting is obtained through a primary reactor or resistor. The voltage impressed across the motor terminals is reduced by the voltage drop across the reactor or resistor, and the inrush current is reduced proportionately. When the motor has accelerated for a predetermined interval, a timer initiates the closing of a second contactor to short the primary resistor, or reactor, and connect the motor to the full line voltage. The transition from starting to running is smooth since the motor is not disconnected during this transition.  Figure 55Principles of the Most Common Reduced Voltage Starters for Squirrel-Cage Motors, Part 2. (The contactor sequence and control diagram show the speed versus torque and voltage versus current characteristics.) Also, the impressed voltage on the motor is a function of the speed at which it is running. Since the current decreases as the motor accelerates, this decreases the drop across the resistor or reactor. The starting torque of the motor is a function of the square of the applied voltage. Therefore, if the initial voltage is reduced to 50%, the starting torque of the motor will be 25% of its full voltage starting torque. If the drive has high inertia, such as centrifugal air- conditioning compressors, a compromise should be made between the starting torque necessary to start the compressor in a reasonable time and the inrush current that may be drawn from the system. Resistor- and reactor-type reduced voltage starters provide closed transition and can be used with standard motors. The resistors are usually selected for 5 seconds on and 75 seconds off. Other conditions require specially selected resistors. A three-step resistor-type starter usually does not start rotating the motor until the end of the first step. At the second step, the starting torque is 45%-50% of normal starting torque. The time setting is also usually between 3 and 4 seconds. The branch-circuit protection is the same as for full voltage starters. This is also true when reactor-type reduced voltage starters are used. They are difficult to adjust, however, and generally are only used for larger medium- voltage motors. Figure 56Principles of the Most Common Reduced Voltage Starters for Squirrel-Cage Motors, Part 3. (The contactor sequence and control diagram show the speed versus torque and voltage versus current characteristics.) Reactor-type reduced voltage starters have somewhat better torque speed characteristics than resistor-type starters; but resistor-type starters are less expensive and, therefore, are used more frequently. Resistor-type starters have the disadvantage that the wattage dissipation during start up can be costly for large motors that are started frequently. Autotransformer Starters (Grey 6.2) An autotransformer starter has characteristics that are similar, but at the same time more efficient, than the resistor- reactor starter. Since an autotransformer controller reduces the voltage by transformation, the starting torque of the motor will vary directly as the line current, even though the motor current is reduced directly with the voltage impressed on the motor. The formula generally used to calculate the starting current drawn from the line with an autotransformer is: the product of the motor locked-rotor current in A at full voltage times the square of the fraction of the autotransformer tap, plus one-fourth of the full-load current of the motor. The reason for this is that the magnetizing current of the autotransformers usually does not exceed 25% of the full-load motor current. Based on this formula, a motor with 100 A full-load current and 600 A locked-rotor current, when started on the 50% tap of an autotransformer, would only draw 175 A inrush current from the line. This is in contrast to the 300 A drawn from the line in a reactor-type or primary-resistor-type starter. If the voltage is reduced to 25% on starting, the torques will be identical on the reactor, primary resistor, and autotransformer starters. Autotransformer starters usually have taps for 65% and 80% voltage for motor up to 50 hp and taps for 50%, 65%, and 80% voltage for larger motors. However, on the autotransformer starter, the torque of the motor does not increase with acceleration but remains essentially constant until the transfer is made from starting to running voltage. Also, with an autotransformer-type starter using a five-pole start contactor and a three-pole run contactor, the motor is momentarily disconnected from the line on transfer from the start to the run connection. This open transition may result in some voltage disturbance. To overcome the objection of the open-circuit transition, a circuit known as the "Korndorfer connection" is in common use. This type of controller requires a twopole and a three-pole start contactor instead of the five-pole. The two-pole contactor opens first on the transition from start to run, opening the connections to the neutral of the autotransformer. The windings of the transformer are then momentarily used as series reactors during the transfer. This allows a closedcircuit transition without losing the advantages of the autotransformer type of starter. Although it is somewhat more complicated, this type of starter is frequently used on high-inertia centrifugal compressors to obtain the advantages of low-line current surges and closed-circuit transition. Standard motors can be used with autotransformer starters. The time setting should be 34 seconds and 45 seconds, respectively, for open- and closed-transition autotransformer starters. Most newer autotransformer starters are of the closed transition type. Wye-Delta (Y - ) Starters (Grey 6.2) Contactors 1M and 2M (as shown in the above circuits) for wye-delta starters carry 58% of the motor load; whereas contactors 1S and 2S carry 33.3% of the motor load. The NEMA rating of a wye-delta starter is higher than that of a full voltage starter that has the same contactor. In closed transition, contactor 2S is usually one size smaller than 1S. An overload relay is included in each phase and set at 58% of the full-load motor current. The time setting should be set somewhat longer than for part-winding starters; that is, 34 seconds on open transition and 35 seconds on closed transition autotransformer and wye-delta starters. The branch-circuit protection has to be selected very carefully for open transition starters. The magnetic trip unit should not trip below 15 times full-load motor current or even higher to avoid tripping on the severe current peak at the transition. The current peak is especially high on autotransformer starters; but it could also be 1314 times full-load motor current on open transition wye-delta starters. On closed transition wye-delta and autotransformer starters, the standard branch-circuit protective device is selected in the same manner as are full voltage starters. Autotransformer starters are mostly used in the United States for ventilators, conveyors, machine tools, pumps, and compressors without relief valves. Wye-delta starters are extensively utilized in Europe, and in the United States, particularly for large air-conditioning units. Wye-delta starters can only be used if the motor has two terminals for each phase. Series-Parallel Starters (Grey 6.2) Series-parallel starters are available, which initially connect the two windings of each phase in series in a conventional wye arrangement. Since this is maximum impedance, the inrush current is about 25% of full-voltage, locked-rotor current, and the torque is 25% of maximum starting torque. The second step removes one winding from each phase and allows the motor to run on the other winding, the same as in the first step of a part-winding controller. The third and final step connects the balance of the winding to the supply lines to affect the parallel connections for normal operation. Solid-State Starters (Grey 6.2) Solid-state or electronic reduced voltage starters provide a smooth, stepless method of acceleration for standard squirrel-cage motors. Three methods of acceleration are available: Constant current acceleration, in which the motor is accelerated to full speed at a field-selectable, preset current level. Current ramp acceleration, in which the voltage is gradually increased to provide smooth stepless acceleration under varying loads. Linear timed acceleration, in which the motor is accelerated at a linear rate that is field-adjustable. A tachometer feedback circuit is required for the latter type of acceleration. A solid-state control circuit provides control for the silicon controlled rectifiers, which are used to provide the variable voltage to the motor. A schematic diagram of the power circuit is shown in Fig 57. 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S! # # xgdk0$a$gdk0"gdk0 7$8$H$gdk0 $Hl]Ha$gdk0gdk0 gdk0gdk0    u G! R! S! # # # # # # e$ f$ ) ) ) G* K* * * $, <, G, H, 7 7 7 7 7 = = > > Z@ n@ y@ z@ /A A ľĸıĩĘȱzȱĸıssĸıĸı h _ hk0jhk0UmHnHuhk0@CJOJQJ^JaJ hk05@CJOJQJ\^Jj|hk0U huhk0 hk0RHi hk0@hk0&h _ hk05@CJOJQJ\^J$h _ hk0@CJOJQJ^JaJ hk05@CJOJQJ\^J*# # f$ ' ) ) * $, H, 1 3 7 7 6: = > Z@ z@ /A A /B B ,gdk0gdk0"gdk0xgdk0$a$gdk0 7$8$H$gdk0gdk0 $a$gdk0$\D]a$gdk0A B /B B C ͍܍'sǏ{ѐsǑBWA$%&UVW÷̄}smismish$B h$BRHdjh$BH*U hR{h>}?huhk0@huhk06@]huhk0@CJRHnaJhuhk0@CJRHnaJhuhk0@H*RHhuhk0@huhk0@huhk06@] hk0RHiU huhk0 hk0@hk0 hk0@)between the motor and the load. A typical enclosed solid-state, reduced voltage starter with fusible disconnect is shown in Fig 58. Solid-state starters are particularly suitable for applications that require extremely fast or a large number of operations, or both (several million under load). In addition to starting motors, solid-state controllers are also used for speed control of ac and dc motors. Speed control of ac motors is further discussed in 6.14. Cost Comparison (Grey 6.2) Table 46 shows a relative cost comparison of some of the more commonly used reduced voltage starters. The cost of solid-state controllers varies considerably, depending on ratings and features. As shown, they are generally more expensive than electromagnetic controllers. Across-the-line starter (Red 10.6.3.1) Manual. Provides overload protection, but not undervoltage protection. One- or two- pole single-phase for motor ratings to 3 hp. Single- or polyphase-motor-control for motor ratings up to 5 hp at 230 V single-phase, 71/2 hp at 230 V three-phase, and 10 hp at 460 V three-phase. Operating control available in toggle, rocker, or pushbutton design. Magnetic, nonreversing. For full-voltage frequent starting of ac motors, suitable for remote control with push-button station, control switch, or with automatic pilot devices. Undervoltage protection is obtained by using momentary contact-starting push-button in parallel with interlock contact in starter and series-connected stop push button. Available in single-phase construction up to 15 hp at 230 V, and three- phase ratings up to 1600 hp at 460 V. Magnetic, reversing. For full-voltage starting of single-phase and polyphase motors where application requires frequent starting and reversing, or plugging operation. It consists of two contactors wired to provide phase reversal, mechanically and electrically interlocked to prevent both contactors from being closed at the same time. Reduced Voltage Starting Red 10.6 From 4.1 Grey 6.11 & 6.15 from 4.1 Variable Frequency Speed Control Red 10.6 From 4.1 Grey 6.11 & 6.15 from 4.1 Information on references can be found in 12.6. Numbers in brackets correspond to the numbers in the bibliography in 11.13. Information on references can be found in 5.9. Parallel fuses Parallel fuses Information about references can be found in 4.5. The numbers in brackets correspond to the numbers of the bibliography in 4.6.      PAGE \* MERGEFORMAT 41 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 6  PAGE 54  PAGE 42 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 14 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 16  PAGE 56 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 18  PAGE 57 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 577  PAGE 58 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 20  PAGE 59 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 577  PAGE 60 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 22  PAGE 61 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 577  PAGE 62 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 24  PAGE 63 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 577  PAGE 64 IEEE Std 141-1993 CHAPTER 12  PAGE 578  PAGE 65  PAGE 66  PAGE 67  PAGE 67 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 30  PAGE 69  PAGE 68 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 38  PAGE 77 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 40  PAGE 79 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 46  PAGE 86 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 50  PAGE 90 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 52  PAGE 91 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 619  PAGE 92 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 56  PAGE 95 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 619  PAGE 96 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 58  PAGE 97 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 619  PAGE 98 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 60  PAGE 99 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 619  PAGE 100 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 62  PAGE 101 IEEE CABLE SYSTEMS Std 141 -1 993  PAGE 619  PAGE 133  PAGE \* MERGEFORMAT 140  PAGE \* MERGEFORMAT 203  PAGE \* MERGEFORMAT 208  PAGE \* MERGEFORMAT 212  PAGE \* MERGEFORMAT 223 # #     Low-voltage fuses have current, voltage, and interrupting ratings, which should not be exceeded in practical application. In addition, some fuses are also rated according to their current-limiting capability as established by UL Standards and are so designated by a class marking on the fuse label (Classes J, K1, K5, L, RK1, RK5, etc.). Current- limiting capabilities are established by UL Standards according to the maximum peak current let-through and the maximum I2t let-through of the fuse upon clearing a fault.         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( 8Help with custom functions and IEEE Draft Standard style Show HelpNewMacros.ShowHelp(p(݋ww"( $&Paste Ctrl+V Paste StuffNewMacros.PasteStuff*i&CopyCtrl+CIEEEStdsTemplateIEEEStdsTemplateLfLfLfLfLf1 (Required Info...!Enter/Update Required Info fieldsNewMacros.general_info(p(݋ww (@Insert Standard Text=Insert formatted required headings, and Required Info fields.Custom Popup 29 (@Insert Special%Insert miscellaneous formatted items.Custom Popup 31 (@Tables5Insert tables and table captions; apply table styles.Custom Popup 50 (@Figures#Insert figures and figure captions.Custom Popup 51 (@ Definitions@Insert Definitions clause heading; format terms and definitions.Custom Popup 52 (@Annexes+Insert annexes; apply annex heading styles.Custom Popup 32 (@Document OperationsCPerform field operations and reset document to show opening splash.Custom Popup 33 (@HelpLinks to Help documents.Custom Popup 57Custom Popup 29 Custom Popup 291 (@HeadingsCustom Popup 35 (@Required Info (fields)Custom Popup 36Custom Popup 30 Custom Popup 301 *@[ Body TextIEEEStds Paragraph(p(݋wwCustom Popup 31 Custom Popup 311 *@[Bibliographic EntryIEEEStds Bibliographic Entry(p(݋ww(Equation/Eq. 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IEEEStds Single Note hA@rReplaceIEEEStds Single Note hA@r ] is used to make changes in figures or equations by removing the existing figure or equation jand replacing it with a new one. Editing instructions, change markings, and this NOTE will not be carried [over into future editions because the changes will be incorporated into the base standard. IEEEStds Single Note hA@ro@  B@Ho `]H J$.D D!LIEEEStds Table Data - Center Z(n DB@Lk | H A@No ] R Z%P T$.D DB@Hd0 A@Bk o  ]` $.D D9XC@5LA@IEEEStds Image Z(nC@Lk q o ۷Attribute VB_Name = "NewMacros" Sub DisplayVariables() 'Show all currentstom docvP ADim mz As ,$Sng .my>LIST OF CUSTOM DOCVARIABLES% For EachwIn ActiveDocum}.˃9;& Chr(13) ": " k.Value 6NextLMsgBoxEnd SubReset[0InfoZOnp Errtj +run to\ rƂw , finternal use ponlyC"M bNE .DeleteB9EWith b.Add "tabfigcaps", "nonevjxtT!lUse (idx 0GorRPorSTDBGde./Rec. 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Style"IEEEStds @Image"#.Execu ?&k      !"#$%&'()*+,-./012345679:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwyz{|}~(SPSSS0{F7FA0753-04AC-477B-AEC1-8B5C3208536A}{60B67443-1B4A-4936-BEF3-0EA8492DEEBB}` P@ ~ `% %@@ @O "  "  (8 "@ HXh A@ro`@A@o@A@o HAttribute VB_Name = "style_help"D Bas0{F7FA0753-04AC-477B-AEC1-8B5C3208536A}{60B67443-1B4A-493 6-BEFhEA8492DEEBB} dGlobaBlSpacoFalse Cre atablPr@edeclaI"dTru BEx0pose0TemplateDerivCustomizD P Sub OK_Click() Unl oad MGEn2d manual_link GoToURL 1  t^_and_doc s"3HLlh cadd_warning. paste_stuff8add_equation+add_overview!x xME(SPSSS0{033A4B01-38D0-4B4F-B98E-BCE2BEBA04FF}{915B8778-AE98-4D28-9CFF-9859E9446862} P@ |% %@@@O ">zH  (@H `p0  "   !Z!< !\!< !^!<deKYou must select CAUTION or WARNING, and enter text for the caution/warning, or click Cancel to exit.A@L|0k( Z pfC@d !\!<CAUTION 9d !^!<eWARNING 9dkIEEEStds Warning9n5v(x hfC@d !Z!< IEEEStds Warning hA@rC@zq@ A@ro(@ A@roAttribute VB_Name = "add_warning" Bas0{033A4B01-38D0-4B4F-B98E-BCE2BEBA04FF}{915B8778-AE98-4D28-9CFF-9859E944 6862} dGlobalSpacoFalse CreatablPredeclaIdTru BExpose0Templat@eDerivCustomizD` P Sub OK_Click()  If ((Me._text .Value"") Or (Not caution) And   )) Then/1MsgBox "You mR select CAUTION or WARNING, aenter # fthe /D," & vbCr"c4 Cancel to exit.w@sAE?$E IfWith< S#7A .C ollapdir+:=wdEStartG AQQHKABT@XA>1GEDKUTJDOGPH:B Sty©"IEEEStds W Font.Bol[EVDnsFmt<Зo, ", , .TypeParagraph  A8Unload Mk]_cBDK`(t /k lhc' DLZV S]Dq2VO456{0vFL4xME@SPSSS+  ( 0X8 0@HX`p A@r (!o`@]H Z !!<--C@ !!<e C@ ! !<eIEEEStds Image9n  C@d@You must make a selection.A@L<error - no selection|kq A@r------|=Pasting failed. Click Retry to choose a different Paste type, 7or Cancel to exit. It is advised that text and graphics Fare pasted separately. For images, use Figures->Insert Figure/Graphic.  Paste failed.$L'  r>|dF A@rkoUAttribute VB_Name = "paste_stuff" Bas0{AF6DE4B5-0125-4EFA-983E-C71DED03797F}{F2E2AB8E-3FFC-439D-89AA-417DDC54 BE72} dGlobalSpacoFalse CreatablPredeclaIdTru BExpose0Templat@eDerivCustomizD` P Sub cancel_Click () Un@load MJELndOKDimssage As Variant On Error GoTo FailP?1With Selectio&n; If&.Text_KeepFormat.Value TheH A .EcHRemoveSpecial D@nType:=Insert /G# .",`, eE"oX!vbCk_0?|: -`2A2| tlhxMEPSPSSS<<<<0{2B80580B-4813-46C0-80D7-B67EF4A5265F}{68CD2342-5572-4304-9B49-B567FB0E87F7} |@ AA` % %` ~`X0%` %@dupP@0`OJ "  " (HTP0@H4P.4(08XJx(H@,X H* \ ` .p B p.  R ^ hp Z 08 0h     L @  P p x  N .  4( ` F  (      "     A@ro`@] HeadeA@ !!< !!<=*check missing location or object to insert0You must indicate where the equation is located: 3in the regular body of the standard or in an annex.A@L !B@|k !!< !!< !!<"You must select an item to insert.A@L !B@|0k( !!<#skip dialogs, just add numberx  JUse this function only to add new numbering for existing equations. Also, Rthe cursor must be positioned at the end of the equation line after the tab stop.  %Click Cancel to exit and move cursor. Warning!$LF|jk !!<F 'j !!<F 'j $!HF|j<back to form if Close or Cancel0IEEEStds Equation (% Z(n !!<F d ZB@jMdon't add tab if numonly hf ZB@d !!<$for regular equations Z!ll lLISTNUM STDS_EQd Z!B@ !!<e(for annex equations Verror handling for lack of annex style present in document, which will throw an error. (!. Z!l "Heading 1" \n %. !!d.Error! No text of specified style in document.GThere are no annexes defined. Please create an annex, then go back and add numbering to your equation.A@L B@ $go back so user can add annex clausekH !!d$'8-extract the annex number from the actual text B@ Mhaving tested for existence of annex number, and getting it, delete the field anow add the correctly formatted annex eq field, but because there is no function to add this type Tof field with the necessary format, must "manually" update the field after adding it Z!l ( .) %. *show the codes in order to manually update ( B@H pf ZB@d ^ b ZB@ Z!ll lANX_ _EQd Z!B@ (!B@ `^b ZB@k A@rHIf updated, function below might be used to shorten the procedure above.(Function InsEq(varDialogType As Variant) CheckWhere. If (Dialogs(varDialogType).Show = -1) Then With Selection? .Style = ActiveDocument.Styles("IEEEStds Equation") .MoveEnd! .TypeText Text:=vbTab .Fields.Add Range:=Selection.Range, Type:=wdFieldEmpty, Text:=' "LISTNUM STDS_EQ", PreserveFormatting:=True End With End If End FunctionoA@oCAttribute VB_Name = "add_equation" Bas0{2B80580B-4813-46C0-80D7-B67EF4A5265F}{68CD2342-5572-4304-9B49-B567FB0@E87F7} dG lobalSpacoFalse CreatablPredec$laIdTru BExpose0TemplateDerivCustomiz1D P Sub cancel_Click() Unl oad MIEnd insertDim varI As Variant, myFiel ds , th is , st@rAnnex S ng"Chec`kWher#&If Not ((@Me.opt .Value) Or BodyD) Then 'cA missing locB or object to 5CAMsgBox ("You mS@di@e w$2e  ised:" & v(bCr_"iBnB regu@ "b) ofstandard$ an aC."e#e.eq_type.SetFocusExitgj nIfCLN`umOnlGHMMSEQBSGrapphicJTIs elT0itemV 3[_wh3<,=skip dialogs, j6 num8ber"("U!S func9 o$ew $GfFexist?s. Also, ?the` curs`BIbe `|iA @xaPen$BJline after"Ec eop. y .C"{ tId movE.",T OK`WarnQ!")1f: JKGoTo Add`/c),MD3lIA3:H= wdDB4cOBp 3NyPictu s(Ɠ).Sh4ow-'back&`S0i*Od3"ANX_dd%Ylds.U# .aPgqw5AEć'Y*Dd,bel6mOP3po $rt`RQ$procebd` ab`h'FEqCqyݐa')(h Q Wi9j &' .Style = ActiveDocumentXs("IEEEStds Equation") MoveEnd ,Type Text := vbTab FFields.Add Range:=Seleon. , F:=wd*EmptyV0:= _ N"LISTNUM STDS_EQ", PreserveFormatting:=True_ With3 IfFunH Sub Privat$e  s_manual_link_Click(HGoToURL 1 0L7# lh%xME(SPSSS0{DC58C059-E2D8-4CB5-853B-8184C6CC3F15}{FFEEA96C-42B4-4CBF-81FE-0AAABB6BDDA8}X X` |    "X ~% %XXXXX (O "(88Jp6Thp x" " " " " (8]@ pf ZB@d< !!<Overview IEEEStds Level 1 Header hA@rScope Purpose IEEEStds Level 2 Header hA@rNotes !!<eScope IEEEStds Level 1 Header hA@rd0You must make a choice, or click Cancel to exit. Nothing Chosen$L'g|k A@rt eithopX A@r NotesoP (6A@Lo0A@ Heado (6oXA@oAttribute VB_Name = "add_overview" Bas0{DC58C059-E2D8-4CB5-853B-8184C6CC3F15}{FFEEA96@C-42B4JF@FE-0AAABB6BDDA8} dGlobal!SpacoFalse CreatablPre declaIdTru BExpose0TemplateDerivCustomizD P Sub InsertHeadings_Click() Dim intMis"s Aste@ger Selection.Collapdir :=wdA StartIf (Me.all.Value) Then )DFmtText "O & vbCr, "IEEEStds Le@vel 1 ,er", GEndScope""PurW2E|3s_4J 36e= MsgBox("You m{ make a choice, or ct CancMto exit.MvbOKOnlBy@#NothyCrhn"AdE X IfUnload M@KcGA instru"Ms.VisijfPARapproval_link GoToURL 2 9_`vrtyl@e_manu1ThisDocument_VBA_PROJECT #-1change_def_level"add_references_head("$  lh8<,9 EFJLx@hx t `H% @d @(T @P L`8%H`8% @D @@ @@0 @X @p @ @ h@ hP(a@x @@ O$*\Rffff*1u4fe996ad*\R0*#17$*\Rffff*2>4fe996ad$*\Rffff*2=4fe996ad*\R1*#158*\R1*#d0*\R1*#8c*\R1*#cc*\R1*#cd*\R4*#4e*\R4*#4d*\R4*#8c*\R1*#c6*\R1*#17e*\R1*#c1*\R1*#17b4$ " " ( 08@'H  h  px '     $V*  H(HP X6+`8+ ((*00-o`@ (9*9.08IEEEStdsTemplate72\9496q8xIEEEStdsFormatting729496q@8q0IsNew (%:!<YE- D >!@(B FB@H#2. JB@H:\WNIsNew (%:(<\k|0,The IEEEStdsTemplate toolbar has not loaded.A@Lr|`8X.The IEEEStdsFormatting toolbar has not loaded.A@L|oXAttribute VB_Name = "ThisDocument" Bas1Normal.VGlobal!SpaclFalse CreatablPre declaIdTru BExposeTemplateDeriv$CustomizC1 PA Sub _Cl6() 1Act* .UpdStylesOnOpenXzEnd$**With ,681ached~C"On Error GoTo FailCmdBar  .CommanAs("IEEEShtds "@EnOa.Vi|siCyCWE 'Fttin>g' ?()(Res@ Next$A If (0VariHSsNew").Valu"Y") T8henWindowOew.FieldSha&dB@twd Alwayswelcome.ShowGdoc_infoNH aIf# Exit)[ J:MsgBoxe mI toolbar has not loaded.e < ? $~ a  *\G{000204EF-0000-0000-C000-000000000046}#4.1#9#C:\PROGRA~1\COMMON~1\MICROS~1\VBA\VBA7\VBE7.DLL#Visual Basic For Applications*\G{00020905-0000-0000-C000-000000000046}#8.5#0#C:\Program Files\Microsoft Office\Office14\MSWORD.OLB#Microsoft Word 14.0 Object Library*\G{00020430-0000-0000-C000-000000000046}#2.0#0#C:\WINDOWS\system32\stdole2.tlb#OLE Automation*\G{0D452EE1-E08F-101A-852E-02608C4D0BB4}#2.0#0#C:\WINDOWS\system32\FM20.DLL#Microsoft Forms 2.0 Object Library*\G{4CB8DDA0-BFAF-4145-9124-779CCC1C610C}#2.0#0#D:\DOCUME~1\mazurm\LOCALS~1\Temp\VBE\MSForms.exd#Microsoft Forms 2.0 Object Library.E .`M &*\G{2DF8D04C-5BFA-101B-BDE5-00AA0044DE52}#2.5#0#C:\Program Files\Common Files\Microsoft Shared\OFFICE14\MSO.DLL#Microsoft Office 8.0 Object Library*\CNormal*\CNormalFO O  lhThisDocument1u4fe996ad#ThisDocument808 add_annex1v4fe996adOadd_annex'welcome2=4fe996adGwelcome;G0 change_def_level1y4fe996ad change_def_levelHs (add_definitions_head1z4fe996ad(add_definitions_head#`Uadd_equation204fe996adadd_equationxadd_notes214fe996adadd_notesb; add_overview224fe996adadd_overview%) &add_references_head234fe996ad%&add_references_headmNewMacros254fe996ad&NewMacrosP`add_warning264fe996adadd_warning cstyle_help274fe996ad7style_helpB"add_table284fe996adadd_tablee g doc_info2>4fe996adKdoc_info?8Y;paste_stuff2<4fe996ad=paste_stuffcPq pP80H`x ߋrp>4EH5!MDX>W20`cȪ!%CPWoQO:7qCu#C-OvZ vp.֫OrcBl Wordk VBAWin16~Win32Win64xMacVBA6#VBA7# IEEEStdshstdole`MSFormsCOfficeu Normal ThisDocument< _EvaluateDocument_Close7\ActiveDocument\UpdateStylesOnOpen  Document_OpenAttachedTemplateFailCmdBarTemplates CommandBars Enabled۪VisibleFailCmdBarFormatting VariablesnValueK ActiveWindow+ViewI FieldShading wdFieldShadingAlways welcomeShow doc_infoMsgBoxR add_annex)OK_ClickRstrTypeAh annex_title. normativeT informative SelectionZMoveEnd*Unit wdParagraphHCount0vCollapseu direction& wdCollapseEndInsertParagraphBefore)Range StylepwdCollapseStart| ( InsFmtTextChrK~FontUBold TypeParagraph  cancel_Clickstyle_manual_link_Clickz( GoToURLQIEEE_logo_Click*IEEE_Stds_logo_Click^x change_def_level level2ChangeDefLevelFieldsn5level3strFromstrToacurLevel~myFieldUField3myRange-( CheckDefClauseFields7CodeDeletexAddrwdFieldStyleRef3PreserveFormatting=UserForm_Initialize5c prompt_selectN update_notej add_definitions_headݝ ( CheckWhere(vbCr$ ( InsCustFieldyItalic!MoveDown̝ add_equation insert_Click varInsertK~myFields thisField"strAnnexfoptAnnexoptBodyg*eq_typeSetFocus optNumOnly= optMSEQobjA optGraphicz ins_which% vbOKCancelx?AddNumwdDialogInsertObject%wdDialogInsertPicture}DialogsStyles pTypeTextvbTabc9 wdFieldEmptyResulturExit_sub2 wdFieldQuote ShowCodes MoveRight wdCharacterwdFieldSequence?UpdateMove>y add_noteslstLT~ ListTemplateR styForNums; single_noteymultiple_noteso ListFormat4JApplyListTemplate8ContinuePreviousListۋsingle_note_Clickq instructionsSmultiple_notes_ClickS add_overviewInsertHeadings_Clicky intMissing`8all'tscope0vbOKOnly all_Click*PARapproval_link_Click  scope_Click/e add_references_head & NewMacrosj( DisplayVariablesnmyVarVariablemyString( ResetDocInfoVariables( UpdateAllFields( ShowHelp style_help( AddAnnexX( AddNotes ( AddOverview ( AddTermNumberCnumLevel6wdFieldListNum0strMsgG& strSearchMContentlFindnExecuteYFindTextForwardWrapWywdFindContinueBP ( FormatDefsd strToSrch#myCount7XomyEnduwdStyleDefaultParagraphFontAddNowӤRight  MoveUntillcset wdBackwarddMoveUpExtend?wdExtenddStartSetRange MoveStart}( AddAcknowledgments/( AddDefinitions ( AddReferencesj- ( general_info( InsertRegularFootnoteD FootnotesLocation-wdBottomOfPage*StartingNumbern NumberStylewdNoteNumberStyleArabicz NumberingRuleqwdRestartSectionp Referencee ( AddWarning add_warningX ( InsertRegularTableCaptionr( InsertRegularFigureCaption( InsertAnnexFigureCaption ( AddCaptionT( InsertAnnexTableCaptiona ( InsertNewList,myListx( InsertNewTable; add_tablelT( InsertNewEquation3( DocInfoDesignationh( DocInfoDraftNumber( DocInfoMonthOfDraftJ( DocInfoYearOfDraftw( DocInfooptTrialUseTitle%( DocInfooptTrialUseLowermB( DocInfoGorRPorSTDTitle4( DocInfoGorRPorSTDLowerw ( DocInfoPARl( DocInfoWorkingGroup( DocInfoCommitteez( DocInfoWkGrpChair-( DocInfoWkGrpViceChair8 ( InsertTOC|strTextstrStyle, varCollapse]blnBold? blnItalic blnStrikeblnUnder1 StrikeThrough" Underline thisPositionwdCaptionPositionAboveVwdCaptionPositionBelow@ CaptionLabelsQowdCaptionNumberStyleArabicIncludeChapterNumberxKChapterStyleLevelC Separator^wdSeparatorPeriod InsertCaptionULabelatitle~PositionstrFieldName_switches intWhereFollowHyperlink-Address NewWindow AddHistory ( ResetToNewvbOK%Itemz ( ShowFieldsK6 ( HideFieldsYwdFieldShadingNeverTOC(TableOfContents mySection"SectionGDes6Draft:monthyear6nTablesOfContentsSUpdatePageNumbers3SectionsHeaders"wdHeaderFooterFirstPage8gwdHeaderFooterPrimaryd myWholeRange myTestRangepmyParas ParagraphsfmyTextFirstzInRange InsertAfterq5 Charactersrg ( PasteStuff& paste_stuff( InsertAddCorrNoteXF ( ChangeDefNumsW( ConvertTextToTablexbmyDialogkiDialogfFailureGEwdDialogTextToTable"Display( ConvertTableToText%6 Information wdWithInTableTwdDialogTableToText ( InsertFigure  floatovertext warn_textfcautionBwarningHtemplate_and_docs_link_ClickJJOK_lg_tbl_ClickwdDialogTableInsertTable# InsertBreakѺwdSectionBreakNextPagexwdMovez PageSetup OrientationwwdOrientLandscapeξGoToNextWhatC wdGoToSectionTUStartOf& wdSection2Footers PageNumbersRestartNumberingAtSectionPX`p(   V( 0 @P"X`&h           (8@HX A@ro`@ !!<21A@(sets as first level header !!<e12A@(sets as second level headerd0'You must select a term numbering level.A@L|k A@ro] 8XDefTermLevelBelow (%:!<' DefTermLevelBelow (%:(<@update custom docvar $=check if Def clause now matches, if not then reset var & exit DefTermLevelBelow (%:(<Hreset on failurezk Z!l.  ! !!dLevel  B@H B@ Z!ll l"IEEEStds Level  Header"\nd (!B@k  B@Hix DefTermLevelBelow (%:!<1KT5(<5(65(62KT5(<5(65(6 xS5(65(6nqooAttribute VB_Name = "change_def_level"  Bas0{BAFCCFCF-6180-4392-A6F2-04D68724AF46}{C2E326E3-804F-451C-8E39-65A819A14794} dGlobaBlSpacoFalse Cre atablPr@edeclaI"dTru BEx0pose0TemplateDerivCustomizDP Sub cancel_Clic@k() Unload MHEnd IOKIf.2.Valu{i Then*,BCDefLFields "2@", "1"'sets as @first  @headerEZ3/12 pseco9S/MsgBox (" You m@V select a term numb@cng-."S>ExitRB@ IfC[Func tion K(strFrom As S@ng, ToDim0 curYI myB], myRA%= A"veDocumHent@\ris4("rT@>Below")d0C2'updaTc"X docvad@?Not (Check@Clause)BM+'c if  l now mat@s,An t`S( re`N & e4CX3' 'C 8failuri aA<#!meBSet2X= SLA.3For Each:InE.s&In@E(1=.Code.Text@oD" `/AKx, 1)gdG.sDt( )A.Add :=,, Type:=wdBSty`leRef:="""IEEESt`J@`& " H""\n@}serve%?ting:=!a /N %*cf77iU _InitializeWith©e CLLK/_৫A 1ppt_.VisiW ׅ.Cs_@he*2 E { w d?._/) A##1! ub       !"#$%&'()*+,-./0123456789:;<=>?@ACDEFGHIJKLMNOPQRSTUVWXY[\]^_`abceghijlmopqrtuvwxz|}~8L?lhmxME(SPSSS0{CC3E195B-D2D0-45D3-A741-89ABF86DB799}{BE7D2501-E69F-480E-AAB2-342C85C4B6D4}` P@ | ~% %@@ @O "P(` P` "h p "  A@Normative references IEEEStds Level 1 Header hA@rZheader IThe following referenced documents are indispensable for the application _of this document (i.e., they must be understood and used, so each referenced document is cited Xin text and its relationship to this document is explained). For dated references, only athe edition cited applies. For undated references, the latest edition of the referenced document 1(including any amendments or corrigenda) applies. IEEEStds Paragraph hA@r A@ro@ A@r xoXA@o80Attribute VB_Name = "add_references_head" Bas0{CC3E195B-D2D0-45D3-A741-89ABF86DB799}{BE7D2501-E69F-480E-AAB2-342C85C4 B6D4} dGlobalSpacoFalse CreatablPredeclaIdTru BExpose0Templat@eDerivCustomizD P Sub OK_Click() CheckWhInsFmtText "Nor(mat8 " & vbCr, "IEEEStds Level 1 Her", wdColla@pseEnd2' er1The f owingd documents @M indispens6 for tapFp2@(on %_"ofis (i.e., y mI be underKod a)u_, s@o each" 1cit_in, tJi+reiionship to!exrined). F1dfds, 0only3:ed4it C >esC2 st EEeR6 4(includAcany2 nda+corrigenda)  Paragraph͂hUnload M'R Tca ~l+Ustyle_manual _link GoToURL 1  8L?Olh#xMEadd_definitions_head*R PROJECT &Bwelcome("^"^fZ(SPSSS0{CB934C5D-1974-4FB0-B6FB-780FC919A3D4}{A5C12F14-C475-4BA2-A9AD-EC33C79A84E9}` P@ | ~% %@@ @O"<BX46R>h ^(8 @ P`"h p"  ZA@ Definitions IEEEStds Level 1 Header hA@r(For the purposes of this draftIEEEStds Paragraph hA@rtxtTrialUse \*LowerIEEEStds ParagraphA@txtGorRPorSTD \*LowerIEEEStds ParagraphA@-, the following terms and definitions apply. 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