ࡱ>  {}zr{k{` bjbjFF ,,`L%lllIII8IL K|2KNS"pSpSS_UXYx$h=l}Y=U"_U}Y}Y=pSS67v7v7v}YRpSlS7v}Y7v7vJ"l_SK sWIi4L0|p-oh_l_,}Y}Y7v}Y}Y}Y}Y}Y==u^}Y}Y}Y|}Y}Y}Y}Y3D9DD9 Notes 13: Shunt Admittance 13.0 Introduction Our motivation is to obtain a distribution system branch model for use in phase-frame studies, in contrast to sequence-frame studies. Phase-frame models for distribution system analysis are only appropriate for computer studies. Before computers, sequence-frame models were the common approach. The advantage of phase-frame modeling is improved accuracy, since we may easily represent variability in the elements of the primitive impedance matrix (rather than requiring equal diagonal elements and equal off-diagonal elements in order to achieve decoupling of the sequence circuits and the resulting ability to perform per-phase analysis of each sequence circuit). Up until now, our interest has been entirely focused on the series impedance part of the distribution branch model. This is the part of the distribution branch for which a voltage drops as loading current increases, and the voltage drop always leads the current that caused it (or the current lags the voltage). Another effect is that leading current is produced as a function of the voltage at a bus. This effect is caused by capacitance. In the case of overhead lines, the capacitance is between phases. In the case of underground cables, the capacitance is between each phase conductor and its outside shield. Which do you think is larger, on a per mile basis? Recall the relation for capacitance of a parallel plate configuration:  EMBED Equation.3  (1) where  is the permittivity of the medium between the plates, A is the area of one of the plates, and d is the distance of separation between them. Note that as d decreases, C increases. For overhead lines, the separation is on the order of several feet. In contrast, for cables, the separation is usually less than an inch. As a result, underground cable capacitance is typically much larger than overhead line capacitance. What does this do to currents? Recall that Xc=1/C, so as C goes up, reactance goes down. For a shunt capacitor, the current is given by V/jXC, so for greater capacitance, we get more charging currents. So it is common to neglect capacitance for overhead lines, but not for cables. And even for lines, particularly if they are long, it can be important to model capacitance. In our case, however, since we intend to embed our phase-frame models in computer programs, there is no reason not to go ahead and model the capacitance, despite the fact that its effects are relatively small. 13.1 Distribution branch model It is useful at this point, before we proceed to describe how to obtain the distribution branch capacitance model, to answer the question, What will we do with it when we get it? To answer this question, Fig.1 shows a distribution branch model. Note the similarity between this model and the -equivalent model presented in EE 303 (and EE 456) for transmission lines, with the main difference being that here we see all three phases. Note the presence of the shunt components characterized by the Yabc matrix (half on left and half on right). Also note that n and m indicate nodes (not neutral conductors).  EMBED Word.Picture.8 Fig. 1 We can relate voltages on the left to voltages on the right using KVL according to:  EMBED Equation.3  (2) We can also relate currents to the left of node m to currents to the right of node m using KCL at node m according to:  EMBED Equation.3  (3) Substituting eq. (3) into eq. (2) yields:  EMBED Equation.3 (4) We can go further with this, and we will, but this suffices, for the moment, to motivate our work on capacitance, which we will eventually convert to the Yabc matrix used in eq. (4) above. 13.2 Infinite Uniform Charged Conductor Consider a charge Q on infinitely long charge on a conductor of length L and radius r. Then the charge density is  EMBED Equation.3  (5)  EMBED Word.Picture.8  Fig. 2 Now consider a cylindrical surface, Fig. 2, with a cylinder enclosing the conductor having surface area A. The radius of the cylinder is R, where R>>r. Define E (volts/meter) as the electric field intensity and Dq (coulomb/m2) as the electric flux density, both vectors directed radially outwards from the conductor such that  EMBED Equation.3  (6) Here, EMBED Equation.3 ,where  EMBED Equation.3 . Also define da as a vector of differential length normal and outwards to the surface of the cylinder. Then recall Gauss law for electric fields which says that the surface integral of the dot product of Dq and da equals the charge enclosed, i.e.,  EMBED Equation.3  (7) Integrating about the cylindrical surface, we obtain:  EMBED Equation.3  (8) Substituting eq. (6) into eq. (8) results in  EMBED Equation.3  (9) Now recall that potential difference between two points in space pa and pb that are located a distance Da and Db, respectively, from the conductor is obtained by  EMBED Equation.3  (10) Since E and dl are both in the radially outwards direction, and using eq. (9), with R replaced by l, we have  EMBED Equation.3  (11) 13.3 Capacitance of a 2-wire line Consider two straight infinitely long conductors separated in space by a distance D12, having radii of r1 and r2, respectively.  EMBED Word.Picture.8  Fig. 3 We desire to obtain the potential difference between two arbitrary points in space due to the charges residing on the conductors. Our approach will be to use superposition and obtain  EMBED Equation.3 , the potential difference due to q1, and  EMBED Equation.3 , the potential difference due to q2. Then we will add to obtain the total potential difference. From eq. (11), we know that the potential difference between two points D1a and D1b away from conductor 1 is given by  EMBED Equation.3  (12) Likewise, the potential difference between two points D2a and D2b away from conductor b is given by  EMBED Equation.3  (13) Then, by superposition,  EMBED Equation.3 (15) If we wanted to obtain the voltage drop between the two conductors, we would simply place point a on conductor 1 and point b on conductor 2. The result would be  EMBED Equation.3  (16) 13.4 Voltage eq. for multi-wire configuration Consider having N charged conductors labeled 1,,N. Then eq. (15) generalizes, and we may obtain the voltage drop between any two points a and b in space as  EMBED Equation.3  (17) Now lets assume that we place the point a on conductor i and the point b on conductor j, where k=1,,i,,j,N. Then eq. (17) becomes  EMBED Equation.3  (18) But then Dib=Dja=Dij, and the voltage we are computing is vij. So,  EMBED Equation.3  (19) A more compact version of eq. (19) is:  EMBED Equation.3  (20) where Dkj=distance between conductors k and j, ft. Dki=distance between conductors k and i, ft. Dkk=rk, the radius of conductor k. 13.5 Capacitance of overhead lines Although the ground does not contribute much capacitance for overhead lines, it does contribute some. To account for this influence, and the influence from nearby conductors, we use the method of images. The method of images proceeds from the fact that a point or line charge above a conducting plane, illustrated in Fig 4a, will produce an electric field exactly the same as the electric field produced by the same configuration together with its image, but without the conducting plane, illustrated in Fig. 4b.  EMBED Word.Picture.8  Note that The image charges are the negative of the actual charges We may apply eq. (20) to the configuration of Fig. 4b to compute potential difference between any two conductors So lets apply eq. (20) to compute the potential difference between conductor i and its image. This will be:  EMBED Equation.3  Note that k=1,,4, with k=1(i k=2(i k=3(j k=4(j  EMBED Equation.3 (21) Also note that Dii= Dii=Sii, Dii=Dii=ri, Dji=Dji=Dij, Dji=Dji=Sij. Then eq. (21) becomes:  EMBED Equation.3 (22) Now we will use the fact that qi=-qi and qj=qj, resulting in:  EMBED Equation.3  (23) Combining logarithms having the same charge out front, we have:  EMBED Equation.3  (24) Equation (24) gives the total voltage drop between conductor i and its image. The voltage drop between conductor i and ground will be one-half of that given in eq. (24), that is:  EMBED Equation.3  (25) In the general case, we will have N conductors. In this case, the approach above can be applied, and it will result in:  EMBED Equation.3 (26) Define the self and mutual potential coefficients: Self:  EMBED Equation.3  (27) Mutual:  EMBED Equation.3  (28) With  EMBED Equation.3 eqs. (27) and (28) become: Self:  EMBED Equation.3  (29) Mutual:  EMBED Equation.3  (30) where eqs. (29) and (30) are given in units of mile/F. Note that we must use consistent units within the logarithm of eqs. (29) and (30). With the notation of eqs. (29) and (30), eq. (26) becomes:  EMBED Equation.3 (31) Equation (31) can be applied to any configuration of overhead conductors. Side question: Do you think eq. (31) is also good for cables? Answer: No. Why not? Because eq. (26) assumes that the electric field from the charged conductor is not confined, i.e., it emanates in all directions an infinite distance. Cables, on the other hand, are purposely shielded to confine the electric field to the area between the phase conductor and the shield. If the phase conductor charge induces equal and opposite charge on the shield such that the charge enclosed by a cylinder at the surface of the cable is zero, then by Gauss Law for electrostatic fields, E=0. Lets apply eq. (31) to a 4 wire, three phase overhead line with phases a, b, c, and a neutral. We obtain:  EMBED Equation.3  (32)  EMBED Equation.3  (33)  EMBED Equation.3  (34)  EMBED Equation.3  (35) In matrix form, this is:  EMBED Equation.3  (37) The primitive potential coefficient matrix is:  EMBED Equation.3  (38) Define the primitive potential coefficient matrix in terms of its submatrices:  EMBED Equation.3  (39) Then we can re-write eq. (37) as  EMBED Equation.3  (40) But [Vn]=[0]. Then we can use our Kron reduction formula to eliminate [qn] as follows:  EMBED Equation.3  (41) so that  EMBED Equation.3  (42) Now recall that in the scalar case, C=q/V ( V=q/C( V=C-1q. Comparing to eq. (42), we see that  EMBED Equation.3 ( EMBED Equation.3 (43) So we can obtain the abc capacitance matrix by inverting the primitive potential coefficient matrix. The abc capacitance matrix may be converted to an abc admittance matrix by multiplying by j according to:  EMBED Equation.3  (44) This is the abc admittance matrix that we used in the KCL equation of eq. (3) above, repeated here for convenience.  EMBED Equation.3  (3) Hurray! ( 13.6 Example An overhead 3-phase distribution line is constructed as in Fig. 5. Determine the primitive potential coefficient matrix, the abc potential coefficient matrix, the abc shunt capacitive matrix, the abc admittance matrix. The phase conductors are 336,400 26/7 ACSR (dc=0.721 inches, rc=0.03004 ft) and the neutral conductor is 4/0 6/1 ACSR (ds=0.563inches, rs=0.02346 ft).  EMBED Word.Picture.8  Fig. 5 The distances are given as: Saa=58 ft Sab=sqrt(582+2.52)=58.0539ft Sbb=58 ft Sac=sqrt(582+72)=58.42 ft Scc=58 ft Sbc=sqrt(582+4.52)=58.1743ft Snn=50 ft Dab=2.5 ft Dac=7.0 ft Dbc=4.5 ft We use the above information in eqs. (29) and (30), repeated here for convenience: Self:  EMBED Equation.3  (29) Mutual:  EMBED Equation.3  (30) The matrix elements are:  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  So the primitive potential coefficient matrix is:  EMBED Equation.3  miles/F Now we do the Kron reduction, invert the matrix, multiply by j377, and we have it! Kron reduction:  EMBED Equation.3   EMBED Equation.3 The above is the primitive potential coefficient matrix. We just need to invert it to obtain the shunt capacitive matrix:  EMBED Equation.3  And the above is the shunt capacitive matrix. Now we multiply it by j, with =2(60)=377.9911 rad/sec.  EMBED Equation.3  13.7 Concentric Neutral Cable We recall that eq. (31), and even eq. (26), is only applicable to overhead lines. To assess cable capacitance, we must go back before the point where we used the method of images (Section 13.5), because it was in using the method of images that we were implicitly assuming that the electric field was not confined. This would be eq. (20), repeated here for convenience:  EMBED Equation.3  (20) where Dkj=distance between conductors k and j, ft. Dki=distance between conductors k and i, ft. Dkk=rk, the radius of conductor k. Now one thing to remember about eq. (20). It gives the potential difference between two points in space, given the presence of any number of charged conductors. The individual terms in the summation require the distances between the two points (point i and point j) and the various charged conductors k=1,,N. Now lets consider carefully the case of the concentric neutral cable. Fig. 6 illustrates. We assume that the entire electric field created by the charge on the phase conductor is confined to the boundary of the concentric neutral strands.  EMBED Word.Picture.8  Fig. 6 Define the following: Rb=radius of a circle passing through the centers of the neutral strands. dc=diameter of the phase conductors=2rc ds=diameter of a neutral strand=2rs k=total number of neutral strands We use these definitions to compute the voltage between the conductor and strand #1 in the presence of the other strands.  EMBED Equation.3  (31) Assume that the charge on each of the neutral strands is 1/k of the charge on the phase conductor and opposite in sign. Therefore, q1= q1= qi= qk= -qp/k (32) Substitution of eq. (32) into (31) yields  EMBED Equation.3 Factoring out qp, we obtain:  EMBED Equation.3 Recalling that the sum of logarithms is the logarithm of the products, we rewrite the above as:  EMBED Equation.3  (33) Now we come to the following question. What are the distances D21, ,Di1, Dk1? These are the distances between strand 1 and all of the other strands (strand 2, 3, , k). How to obtain them? Go back to Fig. 6, repeated here for convenience:  EMBED Word.Picture.8  Fig. 6 Question: how to compute D21 (=D12)? Answer: Use 2 trig identities. Law of cosines:  EMBED Word.Picture.8   EMBED Equation.3  From the Law of cosines, wrspt Fig. 6,  EMBED Equation.3  (34) Taking square roots of both sides, we have:  EMBED Equation.3 Now multiply top and bottom inside the square root by 2.  EMBED Equation.3  (35) From trig identity #2 above, we recognize the square root term as sin(12/2), so:  EMBED Equation.3 ; 12=2/k (36)  EMBED Equation.3  (37) Everyone is happy about this. But now we have another small problem. What is D31, D41,& ,Di1, & Dk1? There is no reason why eq. (37) will not apply for the other distances as well, if we use the right angle. But the angle is easy, it will just be a multiple of /k. And the multiplier, for computing Di1, will just be one less than i. So& .  EMBED Equation.3  (38) Recall eq. (33):  EMBED Equation.3 (33) We can now rewrite the numerator of eq. (33) using eq. (38), according to:  EMBED Equation.3 (39) Now here is where I pull something out of nowhere. The term inside the bracket happens to be.k. Another trig identity. In that case,  EMBED Equation.3  (40) Substitution of eq. (40) into eq. (33) yields:  EMBED Equation.3  (41) But we notice now that the Rb terms cancel, leaving  EMBED Equation.3  (42) Eq. (42) gives the voltage drop from the phase conductor to neutral strand #1. ( Since all the neutral strands are at the same potential, this is the voltage drop from the phase conductor to each and every neutral strand. ( Since all neutral strands are grounded, this is the voltage drop to ground.  EMBED Equation.3  (43) So now recall that C=q/V, so.  EMBED Equation.3  (44) Last issue: what value of permittivity to use? First of all, recall that  EMBED Equation.3 , where  EMBED Equation.3   EMBED Equation.3  is the relative permittivity of the medium in which the E-field exists. The medium in which the E-field exists is, for cables, not air, but rather the insulation material. Table 1 provides typical values of relative permittivity for standard insulating materials. 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If the admittance of one of them is Ypg, write down the shunt admittance matrix Yabc. 13.8 Example Three identical concentric neutral cables are buried in a trench spaced 6 inches apart. The cables are 15 kV, 250 MCM stranded all-aluminum with 13 strands of #14 annealed, coated copper wires, 1/3 neutral. The outside diameter of the cable over the neutral strands is dod=1.29 inches, and the neutral diameter is ds=0.0641 inches. Determine the shunt admittance matrix. The radius is Rb=(dod-ds)/24=(1.29-0.0641)/2=0.6132in The neutral radius is rs=0.0641/2=0.03205in The diameter of the 250MCM phase conductor is rc=0.567/2=0.2835 in. We will assume a relative permittivity of 2.3, with  EMBED Equation.3 . Substitution into eq. (45) yields:  EMBED Equation.3  The phase admittance is then  EMBED Equation.3  13.8 Tape shielded cables Figure 7 illustrates a tape shielded cable with appropriate nomenclature.  EMBED Word.Picture.8 Fig. 7 Recall eq. (45), for the concentric neutral cable with k neutral strands. Equation (45) is repeated here for convenience:  EMBED Equation.3 (45) The tape-shielded cable may be thought of as a concentric neutral cable with an infinite number of strands, i.e., k=". Applying this idea to eq. (45) results in:  EMBED Equation.3 (46) Eq. (46) is not hard to evaluate because we know that as k gets big the natural log gets big but much more slowly than 1/k gets small So the second term in the denominator of eq. (46) is dominated by 1/k. Therefore this second term goes to 0 as k gets big. So we are left with:  EMBED Equation.3  (47) Equation (47) is what we will use for computing the shunt admittance for a tape shielded cable. Values of permittivity should still come from Table 1. 13.9 Example Determine the shunt admittance of the single-phase tape-shielded cable having outside diameter of 0.88 inch with 1/0 AA phase conductor. The thickness of the tape shield is 5 mils. 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McCalleyJames D. McCalley  FMicrosoft Equation 3.0 DS Equation Equation.39q+X0 sin2= 1"cos2 WordDocumentr4SummaryInformation(|DocumentSummaryInformation8_1170496196FmWmW{` VbjbjFF 4,, ```T  < 6LLLL  $ hZn ` " LLG  RL`L *6` L* G : 0< A : ` 0 {  < $t  SHAPE \* MERGEFORMAT   b a c 0248:TV h[3h]:jh[3UmHnHuh[3jh[3U:>@DFJLPRTV$a$gd[3gd[3 :T21h:p[3N N!"X #!$#% 9:Oh+'0  < H T`hpxJames D. McCalleyNormalJames D. McCalley2Microsoft Office Word@G@@CG@xNJG՜.+,0 hp  Iowa State UniversityG  TitleOle CompObjfObjInfoEquation Native t_1170496457FmWmWOle CompObjfObjInfo FMicrosoft Equation 3.0 DS Equation Equation.39q+P D 21 2 =R b2 +R b2 "2R b2 cos 12 =2R b2 1"cos 12 ()Equation Native +_1170496557FmWmWOle CompObjf FMicrosoft Equation 3.0 DS Equation Equation.39q+ D 21 = 2R b2 1"cos 12 ()  =R b  21"cos 12 () ObjInfoEquation Native _1170496669FmWmWOle  FMicrosoft Equation 3.0 DS Equation Equation.39q+q D 21 =R b  2"21"cos 12 ()2  =2R b  1"cos 12CompObjfObjInfoEquation Native _1170496871F0+oW0+oW ()2  FMicrosoft Equation 3.0 DS Equation Equation.39q+h D 21 =2R b sin 12 2Ole CompObjfObjInfoEquation Native _1170497743F0+oW0+oWOle CompObjfObjInfo FMicrosoft Equation 3.0 DS Equation Equation.39q+V`|N D 21 =2R b sink FMicrosoft Equation 3.0 DS EqEquation Native r_1170498141F0+oW0+oWOle CompObjfuation Equation.39q+j D i1 =2R b sin(i"1)k FMicrosoft Equation 3.0 DS Equation Equation.39qObjInfoEquation Native _1170498514F0+oW0+oWOle CompObjfObjInfoEquation Native b_1170498649F0+oW0+oW+F v p1 =q p 2lnR b r c "1klnr S D 21 ...D i1 ...D k1 R bk (){}Ole CompObjfObjInfoEquation Native  FMicrosoft Equation 3.0 DS Equation Equation.39q+™ r S D 21 D 31 ..D i1 ...D k1 =r s R bk"1 2sink2sin2k...2sin(i"1)k...2sin(k"1)k[] FMicrosoft Equation 3.0 DS Equation Equation.39q+5 r S D 21 D 31 ..D i1 _1170499386F0+oW0+oWOle CompObjfObjInfoEquation Native _1170499394F0+oW0+oWOle CompObjf...D k1 =r s R bk"1 k FMicrosoft Equation 3.0 DS Equation Equation.39q+ v p1 =q p 2lnR ObjInfoEquation Native +_1170499521F0+oW0+oWOle b r c "1klnr s R bk"1 kR bk (){} FMicrosoft Equation 3.0 DS Equation Equation.39q+|N v p1 =CompObjfObjInfoEquation Native _1170500339F0+oW0+oWq p 2lnR b r c "1klnr s kR b (){} FMicrosoft Equation 3.0 DS Equation Equation.39qOle CompObjfObjInfoEquation Native +x v pg =q p 2lnR b r c "1klnr s kR b (){} FMicrosoft Equation 3.0 DS Equation Equation.39q_1170500382F0+oW0+oWOle CompObjfObjInfo  #&),-./0123458;<=?CFGHILOPSVWZ]`cdefilmopqrstuwxyz{}+ CD C pg =q p v pg =2lnR b r c "1klnr s kR b () FMicrosoft Equation 3.0 DS EqEquation Native _1170500576F0+oW0+oWOle CompObjfuation Equation.39q+4 = r  0 FMicrosoft Equation 3.0 DS Equation Equation.39qObjInfo Equation Native  P_1170503119F0+oWбpWOle  CompObj fObjInfoEquation Native _1170500708FбpWбpW+•p  0 =8.8510 "12 F/m=0.0142F/mile FMicrosoft Equation 3.0 DS Equation Equation.39q+   rOle CompObjfObjInfoEquation Native 6_1170501254FбpWбpWOle CompObjfObjInfo FMicrosoft Equation 3.0 DS Equation Equation.39q+ Y pg =jC pg =j2lnR b r c "1klnr s kR bEquation Native ,_1170503134FбpWбpWOle !CompObj"f ()S/mile FMicrosoft Equation 3.0 DS Equation Equation.39q+Sx1ĩ  0 =0.0142F/mileObjInfo$Equation Native %o_1170665611 FбpWбpWOle 'CompObj(fObjInfo*Equation Native +_1170503584FбpWбpW FMicrosoft Equation 3.0 DS Equation Equation.39q+ Y pg =jC pg =j2lnR b r c "1klnr s kR b ()S/mile=j2(2.3)(0.0142)(2)(60)ln0.61320.2835"113ln0.03205(13)0.6132()=j96.5569S/mile FMicrosoft Equation 3.0 DS EqOle 6CompObj7fObjInfo9Equation Native :uation Equation.39q+u Y abc =j96.5569000j96.5569000j96.5569[]  FMicrosoft Office Word Picture MSWordDocWord.Picture.89q_1170663956 FбpWбpWData 1TableCompObj>oDd$GD  3 @@"?@@@ NormalCJ_HaJmH sH tH DA@D Default Paragraph FontRi@R  Table Normal4 l4a (k@(No List @V(#My00_l,2$mģ3Cj"Cym4@(  t  c $@@A̙ C"?B S  ?$Gt]:9&ke\ ( '@ 0@UnknownGz Times New Roman5Symbol3& z Arial"h庒f溒f!\ !r43QHX ?ke\2James D. McCalleyJames D. McCalleyObjInfo@WordDocumentSummaryInformation(DocumentSummaryInformation8 FMicrosoft Equation 3.0 DS Equation Equation.39q+h Y pg =+ k!" lim j2lnR b r c "1{` bjbjFF ,, " :PPPP[]]]]]]$h n"PP+++ PP[+[+++P. n +[0+h  h +h +0+$  SHAPE \* MERGEFORMAT  h]:jhke\UmHnHuhke\jhke\U21h:pke\N N!\ "<#!$% `!mģ3Cj"Cym !P)XV$_xWKlEf؎IvQ[@RQGRj9NzqǩPUHOcp*R9XHH '$8 qD傐š4WęXa8ǓuA %,VFLLhD1H(I貉bBs4WFkN5{$]| 't>Nt}MA,D&*@8٪WgX#">@񙾲W JecJN =սm'[me>ڧD_ZK E'o>^Ηֲr9S}s|6\SWrw궧Q#>51ܡf['\lxHqtt̹c߂dͮgŦFFcK,W{Here,p'X& ۣ',r6ٹ+%\4}ibk$er,ytd~G"ٌJXv$bpZq'轖ge[,dQ@79]7mw&Eͩ2@+Ngs|( ˥L*RXRROY#bF)I,D`rQ zBS g2 p$'"͉Ʀzo_$!t2MN4f."/&o]pJ)*E2ec7FBn a( F>,3;'ӢSzV(䛏|*nI\t6^kͺ/Ng۷^<34mqm.~Eh~)H*Oh+'0  < H T`hpxJames D. McCalleyNormalJames D. McCalley2Microsoft Office Word@F#@FKG@k՜.+,0 hp  Iowa State UniversityG  Title_1170665676FбpW_rWOle ACompObjBfObjInfoDEquation Native E0_1170665535F_rW_rWOle JCompObjKfklnr s kR b ()S/mile FMicrosoft Equation 3.0 DS Equation Equation.39q+‘2\ Y pg =j2lnR b rObjInfoMEquation Native N_1170665447F_rW_rWOle Q c S/mile FMicrosoft Equation 3.0 DS Equation Equation.39q+Ž R b =d s "5/10002=0.4375inchesCompObj RfObjInfo TEquation Native U_11706657297 F_rW_rWOle XCompObj YfObjInfo[Equation Native \J FMicrosoft Equation 3.0 DS Equation Equation.39q+. 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