短路电流计算

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第一章一中央10KV侧短路电流计算第一节最大运行方式下的短路电流计算一、计算依据电业局提供一中央2004年度短路阻抗值,最大运行方式：0.00332+j0.06375,最小运行方式：O.OO332+jO.18517,本计算以电抗为主。一中央最大运行方式：因2#主变是50MVA的变压器，因此以2#主变带全所负荷，发电机在2#主变并网。本1E二、最大运行方式系统图Xmax=O.OS3T5Xmixi=O.18517SZQ-Z-5OOOO/1IOUk%=lO.31OKVv1.4Kh»12(1X3OO)d')10-3000-12FN=3OOOOKW三、各元件电抗计算选取Sjz=1OOMVA,Ujz=Upe=10.5于是：Ijz=Sjz/1.732Upe=100/1.732X10.5=5.5KA将各电抗根据基准容量归算，求出各元件电抗的基准标幺值：系统的电抗标幺值XI=0.06375变压器的电抗标幺值X2=Uk%/100XSd/SNT=(10.3/100)X100/50=0.206电缆线路的电抗标幺值X3'=X0XLXSd/UL2=0.08X1.4X100/10.52=0.1016注意：在计算电缆线路的电抗标幺值时，将单芯电缆的X。按0.08欧姆/千米计算，有12根，X3=X374=0.0254电抗器的电抗标幺值X4=Ux%/100XUnx/1.732XINXXSd/UL2=12/100X10/(3X1.732)X100/10.52=0.2095发电机的电抗标幺值X5=Xd%/100XSd/SN=12.6/100X100/30/0.8=0.336四、等值电路

1系统五、简化等值电路根据各元件的电抗值，可得出系统到短路点d-1的总电抗标幺值为:£1X=X1+X2=0.06375+0.206=0.26975自发电机侧到d-1的总的电抗标幺值为：L2X=X3+X4+X5=0.0254+0.2095+0.336=0.5709分别换算成计算电抗：Xjs,=S|X=0.26975&2=Z2XXSN/Sd=0.5709X30/0.8/100=0.214故简化后的等值电路为：六、短路电流计算

2由系统向短路点d-1提供的短路电流为：Ii”=IjJX「=5.5/0.26975=20.39KA由发电机向短路点d-1提供的短路电流，按Xjs2=0.214查表用插值法求得:b=5.086,Io.2=3.5554(其中b为瞬态电流，出为稳态电流)，故由发电机向短路点提供的短路电流为：12”=5.086X30/0.8X1.732X10.5=10.4874KA,M.2”=3.5554X30/0.8X1.732X10.5=7.331KA。故d-1点的短路电流为：r,=Il,,+I2,，=30.8774KAIo.2=Ii''+Io.2”=27.721KAIc=1.52X30.8774=46.625KAic=2.55X30.8774=78.737KA短路容量为：S,=1.732X10.5X30.8774=561.54MVA短路阻抗为：X*=Ijz/1,,=5.5/30.8774=0.1781一中央10KV侧短路电流计算结果表短路点符号系统3#发电机总计中央10KV侧短路点d-1XX0.269750.5709Xjs0.269750.214I*''Z3.70715.086I*3.70713.5554S''Z(MVA)370.71190.72561.43I''Z(KA)20.3910.487430.8774I(KA)20.397.33127.721ich(KA)78.737Ich(KA)46.625第二节最小运行方式下的短路电流计算一、最小运行方式系统图:

3Xi»3=O.O63TSXein=O.18S1TSF7-40000/110UK%=10.44二、各元件电抗标幺值计算选取Sjz=1OOMVA,Ujz=Upe=10.5于是：Ijz=Sjz/l,732Upe=100/1.732X10.5=5.5KA将各电抗根据基准容量归算，求出各元件电抗的基准标幺值：系统的电抗标幺值Xl=0.18517变压器的电抗标幺值X2=Uk%/100XSd/SNT=(10.44/100)X100/40=0.261三、电抗等值电路四、简化电抗等值电路根据各元件的电抗值，可得出系统到短路点d-1的总电抗标幺值:£X=X1+X2=0.18517+0.261=0.44617换算成计算电抗：Xjs=£X=0.44617故简化后的等值电路为：五、短路电流计算由于在最小运行方式下只有系统向短路点提供短路电流，所以短路点d-1处的

4短路电流即为系统提供的短路电流。而系统提供的短路电流为：Ii，,=5.5/0.44617=12.33KA所以d-1处的短路电流为：I"=h”=12.33KAIc=1.52X12.33=18.62KAic=2.55XI2.33=31.44KA短路容量为：S,=1.732X10.5X12.33=224.23MVA

5第二章二中央10KV侧短路电流计算第一节最大运行方式下短路电流计算一、系统电抗图如下：二、电抗标幺值计算:参照三中央35KV侧短路点d-2短路电流计算，将系统、三烧、二烧、2#发电机和梅塞尔的电抗折算到35KV侧，得:XI'=0.1225X6''=3.338X7''=3.35X5=2.0505X8”=0.7345三、等值电抗图如下:TRT1#发电机

6将系统、三烧、二烧、2#发电机、梅塞尔、TRT和1#发电机的电抗折算到二中央10KV侧，得：SY=1/X1,+1/X6,,+1/X7,,+1/X8,,+1/X5,+1/X4=1/0.1225+1/3.338+1/3.35+1/0.7345+1/2.0505+1/0.2454=8.1663+0.2996+0.2985+1.3615+0.4877+4.07=14.6856C=LYXX4=14.6856X0.2454=3.6038XI"=0.1225X3.6038=0.4415X6"'=3.338X3.6038=12.0295X7"'=3.35X3.6038=12.0727X8"'=0.7345X3.6038=2.647X5,,=2.0505X3.6038=7.3896X9=1.3524X10=1.1693四、简化等值电抗图：将各电抗折算成计算电抗：系统：Xjs=0.4415三烧结同步机：Xjs=12.0295X8.002/100=0.9626二烧结同步机：Xjs=12.0727X7.2/0.9/100=0.96582#发电机：Xjs=2.647X37.5/100=0.9926TRT同步机：Xjs=1.3524X10/0.8/100=0.16911#发电机：Xjs=1.1693X15/100=0.1754梅塞尔同步机：Xjs=7.3896X10.7/0.95/100=0.8323五、计算短路电流：系统向短路点d-3提供的短路电流为：I0=5.5/0.4415=12.4575KA三烧结同步机：按Xjs=0.9626查表得：

71=1.1043,10.2=1.0868因此向短路点提供的短路电流为：11=1.1043X8.002/1.732X10=0.5101二烧结同步机：按Xjs=0.9658查表得：1=1.1,10.2=1.0827因此向短路点提供的短路电流为：12=1.1X7.2/0.9/1.732X10=0.50812#发电机：按Xjs=0.9926查表得：1=1.044,10.2=0.9617因此向短路点提供的短路电流为：13=1.044X37.5/1.732义10.5=2.1528TRT同步机：按Xjs=0.1691查表得：1=6.4287,10.2=4.192因此向短路点提供的短路电流为：I4=6.4287X10/0.8/1.732X10=4.63971#发电机：按Xjs=0.1754查表得：1=6.2058,10.2=4.096因此向短路点提供的短路电流为：15=6.2058X15/1.732X10.5=5.1186梅塞尔同步机：按Xjs=0.8323查表得：1=1.2868,10.2=1.2446因此向短路点提供的短路电流为：I6=1.2868X10.7/0.95/1.732X10=0.8368因此，短路点d-2的短路电流为：I''=I0+n+I2+I3+I4+I5+I6=12.4575+0.5101+0.5081+2.1528+4.6397+5.1186+0.8368=26.2236KA10.2=12.4575+1.0868X8.002/1.732X10+1.0827X7.2/0.9/1.732X10+0.9617X37.5/1.732X10.5+4.192X10/0.8/1.732X10+4.096X15/1.732X10.5+1.2446X10.7/0.95/1.732X10=12.4575+0.5021+0.5001+1.9831+3.0254+3.3784+0.8094=22.656KA短路冲击电流为：Ich=1.52X26.2236=39.86KAich=2.55X26.2236=66.87KA短路容量为：S=1.732X10.5X26.2236=476.9MVA短路阻抗为：X*=5.5/26.2236=0.2097

8二中央10KV侧短路电流计算结果表短路点符号系统三烧结二烧结2#发电机TRT1#发电机梅塞尔总计二中央1OKV侧短路点d-3EX0.441512.0312.07322.6471.35241.16937.3896Xjs0.41150.96260.96580.99260.16910.17540.8323I*MZ2.2651.10431.11.0446.42876.20581.2868I*2.2651.08681.08270.96174.1924.0961.2446SZMVA)226.59.27679.240339.15184.37893.08715.218476.85F'Z(KA)12.45750.51010.50812.15284.63975.11860.836826.2236KKA)12.45750.50210.50011.98313.02543.37840.809422.656ich(KA)66.87lch(KA)39.86第二节二中央10KVI段短路电流计算运行方式：三中央1#主变带梅塞尔、1#发电机、二烧结1#主风机3200KW、三烧结一、系统电抗图如下：系统二、电抗标幺值计算：参照三中央35KV短路点d-2短路电流计算，将系统、三烧、二烧和梅塞尔

9的电抗折算到35KV侧,得:XI'=0.1235X6”=2.6084X7''=5.8651X5,=2.0505三、等值电抗图:再将系统、三烧、二烧、梅塞尔和1#发电机的电抗折算到二中央10KV侧,得：LY=1/X1,+1/X6,,+1/X7,,+1/X5,+1/X4=1/0.1235+1/2.6084+1/5.8651+1/2.0505+1/0.2454=8.0972+0.3834+0.1705+0.4877+4.075=13,2138C=XYXX4=13.2138X0.2454=3.2427Xl''=0.1235X3.2427=0.4005X6"'=2.6084X3.2427=8.4583X7'”=5.8651X3.2427=19.0188X5,,=2.0505X3.2427=6.6492四、简化等值电抗图：将各电抗折算成计算电抗：系统：Xjs=0.4005梅塞尔同步机：Xjs=6.6492X10.7/0.95/100=0.74891#发电机：Xjs=1.1693X15/100=0.1754二烧结1#主风机3200KW：Xjs=19.0188X3.2/0.9/100=0.6762三烧结同步机：Xjs=8.4583X8.002/100=0.6768二烧系统赢同罐貌母电机梅塞尔

10五、短路电流计算：系统向短路点d-3提供的短路电流为：I0=5.5/0.4005=13.7328KA三烧结同步机：按Xjs=0.6768查表得：1=1.5915,10.2=1.4969因此向短路点提供的短路电流为：11=1.5915X8.002/1.732X10=0.7353二烧结同步机：按Xjs=0.6762查表得：1=1.593,10.2=1.4981因此向短路点提供的短路电流为：I2=1.593X3.2/0.9/1.732X10=0,3271#发电机：按Xjs=0.1754查表得：1=6.2058,10.2=4.096因此向短路点提供的短路电流为：13=6.2058X15/1.732X10.5=5,1186梅塞尔同步机：按Xjs=0.7489查表得：1=1.4303,10.2=1.3649因此向短路点提供的短路电流为：I4=1.4303X10.7/0.95/1.732X10=0.9301因此，短路点d-3的短路电流为：r^IO+Il+12+13+14=13.7328+0.7353+0.327+5.1186+0.9301=20.8438KA10.2=13.7328+1.4969X8.002/1.732X10+1.4981X3.2/0.9/1.732X10+4.096X15/1.732X10.5+1.3649X10.7/0.95/1.732X10=13.7328+0.6916+0.3075+3.3784+0.8876=18.9979KA短路冲击电流为：Ich=1.52X20.8438=31.68KAich=2.55X20.8438=53.15KA短路容量为：

11S,=1.732X10.5X20.8438=379.07MVA短路阻抗为：X*=5.5/20.8438=0.2639二中央10KV侧短路电流可卜算结果表短路点符号系统三烧结二烧结1#发电机梅塞尔总计一中央10KV侧短路点d-3EX0.40058.458319.01881.16936.6492Xjs0.40050.67680.67620.17540.7489I*”z2.49691.59151.5936.20581.4303I*2.49691.49691.49814.0961.3649S"Z(MVA)249.6913.3725.9468293.08716.915379.011InZ(KA)13.73280.73530.3275.11860.930120.8438KKA)13.73280.69160.30753.37840.887618.9979ich(KA)53.15Ich(KA)31.68第三节二中央10KVII段短路电流计算1运行方式：三中央2#变带二烧结4000KW风机、2#发电机、TRT系统2#发电机TRT一、系统的电抗图如下：二烧4000K・风机

12二、各元件电抗标幺值计算：将一烧和2#发电机的电抗折算到绕组中压侧，得:二烧4000KW同步机4.5195.95330.15620.5523、/2娥电机0.72762被电机二烧4000即同步机X7'=X7+X2+X7XX2/X8=4.519+0.1562+4.519X0.1562/0.5523=5.9533X8,=X8+X2+X8XX2/X7=0,5523+0.1562+0.5523X0.1562/4.519=0.7276再将系统、三烧和2#发电机的电抗折算到35KV侧，得：£Y=1/X1+I/X7，+1/X8，+1/X3=1/0.12979+1/5.9533+1/0.7276+1/(-0.00575)=7.7048+0.168+1.3744-173.913=-164.6658C=-l64.6658X(-0.00575)=0.9468Xl=0.12979X0.9468=0.1229X7”=5.9533X0.9468=5.6366X8”=0.7276X0.9468=0.6889再将系统、二烧、2#发电机和TRT的电抗折算到二中央1OKV侧，得:

13£Y=1/X1"+1/X7'''+1/X8'''+1/X4=1/0.1229+1/5.6366+1/0.6889+1/0.2454=8.1367+0.1774+1.4516+4.075=13.8407C=LYXX4=13.8407X0.2454=3.3965X1'”=0.1229X3.3965=0.4174X7'"'=5.6366X3.3965=19.1447X8'"'=0.6889X3.3965=2.3398X9=1.3524三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.4174二烧结同步机：Xjs=19.1447X4/0.9/100=0.85092#发电机：Rs=2.3398X37.5/100=0.8774TRT同步机：Xjs=l.3524X12.5/100=0.1691

14四、短路电流计算：系统向短路点d-3提供的短路电流为：I0=5.5/0.4174=13.1768KA二烧结同步机按Xjs=0.8509查表用插值法求得：12=12527,Io.2=1.2159；因此向短路点d-3提供的短路电流为：I1=1.2527X(4/0.9)/(1.732X10)=0.3215KA；2#发电机按Xjs=0.8774查表用插值法求得：b=1.1842,Io.2=LO817；因此向短路点d-3提供的短路电流为：12=1.1842X37.5/(1.732X10.5)=2.4419KA；TRT同步机按Xjs=0.1691查表用插值法求得：b=6.4249,Io.2=4.19O4；因此向短路点d-3提供的短路电流为：13=6.4249X12.5/(1.732X10)=4.6369KA；因此，短路点的短路电流为：r^IO+Il+12+13=13.1768+0.3215+2.4419+4.6369=20.5771KA10.2=13.1768+1.2159X4/0.9/1.732X10+1.0817X37.5/1.732X10.5+4.1904X12.5/1.732X10=13.1768+0.312+2.2305+3.0242=18.7435KA短路冲击电流为：Ich=1.52X20.5771=31.28KAich=2.55X20.5771=52.47KA短路容量为：S=1.732X10.5X20.5771=374.22MVA短路阻抗为：

15X*=5.5/20.5771=0.2673二中央10KV侧短路电流计算结果表短路点符H系统二烧结2#发电机TRT总计二中央10KV侧短路点d-3EX0.417419.1452.33981.3524Xjs0.41740.85090.87740.1691I*''Z2.39581.25271.18426.42871*2.39581.21591.08174.192S''Z(MVA)239.585.846844.40884.327374.162r'Z(KA)13.17680.32152.44194.636920.5771I(KA)13.17680.3122.23053.024218.7435ich(KA)52.47Ich(KA)31.28第四节二中央10KVII段短路电流计算2运行方式：三中央2#变带二烧结4000KW风机、2#发电机、TRT、三烧一、系统的电抗图如下：

16二、各元件电抗标幺值计算：将三烧、二烧和2#发电机的电抗折算到绕组中压侧，得:三烧二膂重貌心2破电机三烧二着嚣乳m2破电机EY=l/2.51+1/4.519+1/0.5523+1/0.1562=0.3984+0.2213+1.8106+6.402=8.8323C=8.8323X0.1562=1.3796X6=2.51X1.3796=3.4628X7=4.519X1.3796=6.2344X8=0.5523X1.3796=0.762将系统、三烧、二烧和2#发电机的电抗折算到二中央1OKV侧，得:EY=l/3.4628+1/6.2344+1/0.762+1/0.12979+1/0.23965=0.2888+0.1604+1.3123+7.7048+4.1728=13.6391C=13.6391X0.23965=3.2686X6=3.4628X3.2686=11.3185X7=6.2344X3.2686=20.3778X8-0.762X3.2686=2.4907Xl=0.12979X3.2686=0.4242

17三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.4242三烧结同步机：Xjs=l1.3185X8.002/100=0.9057二烧结同步机：Xjs=20.3778X4/0.9/100=0.90572#发电机：Xjs=2.4907X37.5/100=0.934TRT同步机:Xjs=1.3524X12.5/100=0.1691系统二烧2以电机TRT三烧四、短路电流计算：系统向短路点d-3提供的短路电流为：10=5.5/0.4242=12.9656KA二烧结同步机按Xjs=0.9057查表用插值法求得：b=L1747,Io.2=L1486；因此向短路点d-3提供的短路电流为：I1=1.1747X(4/0.9)/(1.732X10)=0.3014KA；三烧结同步机按Xjs=0.9057查表用插值法求得：b=1.1747,I0.2=l.I486；因此向短路点d-3提供的短路电流为：12=1.1747X8.002/(1.732X10)=0.5427KA；2#发电机按Xj‘=0.934查表用插值法求得：b=L1108,Io.2=LO19；因此向短路点d-3提供的短路电流为：13=1.1108X37.5/(1.732X10.5)=2.2905KA；TRT同步机按Xjs=0.1691查表用插值法求得：b=6.4249,10.2=4.1904；因此向短路点d-3提供的短路点电流为：14=6.4249X12.5/(1.732X10)=4.6369KA；因此，短路点的短路电流为：I''=IO+I1+I2+I3+I4=12.9656+0.3014+0.5427+2.2905+4.6369=20.7371KAIo.2=12.9656+1.1486X4/0.9/1.732X10+1.1486X8.002/1.732X10+1.019X37.5/1.732X10.5+4.1904X12.5/1.732X10=12.9656+0.2947+0.5307+2.1012+3.0242=18.9164KA

18短路冲击电流为：Ich=1.52X20.7371=31.52KAich=2.55X20.7371=52.88KA短路容量为：S'=1.732X10.5X20.737l=377.07MVA短路阻抗为：X*=5.5/20.7371=0.2652二中央10KV侧短路电流计算结果表短路占八、、符号系统二烧结三烧结2#发电机TRT总计二中央10KV侧短路点d-3EX0.424220.37811.3192.49071.3524Xjs0.42420.90570.90570.9340.1691I*''Z2.357381.17471.17471.11086.42871*2.357381.14861.14861.0191.192S''Z(MVA)235.7385.48139.869541.65584.327377.07r'Z(KA)12.96560.30140.54272.29054.636920.7371I(KA)12.96560.29470.53072.10123.024218.9164ich(KA)52.8796Ich(KA)31.5204第五节当三中央0#变代替1#变运行时，二中央10KVI段短路电流计算1运行方式：三中央0#变带梅塞尔、1#发电机、2#发电机、二烧3200KW风机、三烧一、系统等值电抗图:

19系统二、各元件电抗值的换算:将三烧、二烧和2#发电机的电抗折算到绕组中压侧，得:EY=l/2.51+1/5.644+1/0.5523+1/0.1557=0.3984+0.1772+1.8106+6.4226=8.8088C=8.8088X0.1557=1.3715X6=2.51X1.3715=3.4425X7=5.644X1.3715=7.7407X8=0.5523X1.3715=0.7575将系统、三烧、二烧和2#发电机的电抗折算到三中央35KV侧，得:EY=l/3.4425+1/7.7407+1/0.7575+1/0.12779+1/(-0.00625)=0.2905+0.1292+1.3201+7.8253-160=-150.4349C=-150.4349X(-0.00625)=0.9402X6=3.4425X0.9402=3.2366X7=7.7407X0.9402=7.2778

20X8=0.7575X0.9402=0.7122Xl=0.12779X0.9402=0.1201XI0=1.7874+0.2631=2.0505再将系统、三烧、二烧、2#发电机和梅塞尔的电抗折算到二中央10KV侧,得：LY=l/0.1201+1/3.2366+1/7.2778+1/0.7122+1/2.0505+1/0.2454=8.3264+0.309+0.1374+1.4041+0.4877+4.075=14.7396C=14.7396X0.2454=3.6171X6=3.2366X3.6171=11.7071X7=7.2778X3.6171=26.3245X8=0.7122X3.6171=2.5761Xl=0.1201X3.6171-0.4344X10=2.0505X3.6171=7.4169三、化简等值电抗图：将各元件的电抗全部换算成计算电抗：系统:Xjs=0.4344三烧同步机：Xjs=ll.7071X8.002/100=0.9368二烧同步机：Xjs=26.3245X(3.2/0.9)/100=0.936

212#发电机:Xjs=2.5761X37.5/100=0.9661#发电机:Xjs=l.1693X15/100=0.1754梅塞尔同步机：Xjs=7.4169X(10.7/0.95)/100=0.8354因此等值电抗图如下：二烧_系统1#发电机裔璘J云莱同2峨:电机诲塞尔四、短路电流计算：系统向短路点d-3提供的短路电流为：10=5.5/0.4344=12.6611KA二烧结3200KW同步机按XJS=0.936查表用插值法求得：L=L1359,L).2=L1表7；因此向短路点d-3提供的短路电流为11=1.1359X3.2/0.9/1.732X10=0.2332KA；1#发电机按X”=0.1754查表用插值法求得：12=6.1909,I。♦2=4.0896；因此向短路点d-3提供的短路电流为12=6.1909X15/1.732X10.5=5.1063KA；三烧结同步机按Xjs=0.9368查表用插值法求得：I2=l.1349,102=1.1138；因此向短路点d-3提供的短路电流为13=1.1349X8.002/1.732X10=0.5243KA；2#发电机按%、=().966查表用插值法求得：12=1.0731,Io,2=O.9866；因此向短路点d-3提供的短路电流为14=1.0731X37.5/1.732X10.5=2.2128KA；梅塞尔同步机按Xjs=0.8354查表用插值法求得：b=L2779,Io.2=1.2371；因此向短路点d-3提供的短路电流为：15=1.2779X(10.7/0.95)/(1.732X10)=0.831KA因此，短路点的短路电流为：『=10+11+12+13+14+15=12.6611+0.2332+5.1063+0.5243+2.2128+0.831-21.5687KAIo.2=12.6611+1.2371X10.7/0.95/1.732X10+4.0896X15/1.732X10.5+1.1147X3.2/0.9/1.732X10+1.1138X8.002/1.732X10+0.9866X37.5/1.732X10.5=12.6611+0.8045+3.3731+0.2288+0.5146+2.0344=19.6165KA短路冲击电流为：Ich=l.52X21.5687=32.7844KAich=2.55X21.5687=55KA

22短路容量为：S'=1.732X21.5687X10.5=392.2MVA短路电抗为：X*=5.5/21.5687=0.255二中央10KV侧短路电流计算结果表短路点符号系统；烧结烧结1#发电机桁塞尔2#发电机&计0.4311.26.1.1697.42.576EX44707325316910.430.90.90.1750.8Xjs443683643540.9662.301.11.16.1901.21.073I*'Z20334935997791一2.301.11.14.0891.20.986中央伊203138147637161OKV侧SZM230.9.54.292.8615.40.24392.短路点VA)2033494131132197d-3r'z(KA12.60.50.25.1060.82.21221.5)611243332331868712.6().5().23.3730.82.03419.6KKA)61114628810454165ich(KA55.0)002

23lch(KA32.7844第六节当三中央0#变代替1#变运行时，二中央10KVI段短路电流计算2运行方式：三中央0#变带梅塞尔、1#发电机、2#发电机、二烧3200KW风机一、系统等值电抗图：3200KW同步机二、各元件电抗值换算：将二烧和2#发电机的电抗折算到绕组中压侧，得:

245.6440.55237.39080.7232二烧3200KW同步机2雄电机二烧3200KW同步机2雄电机X7=5.644+0.1557+5.644X0.1557/0.5523=7.3908X8=0.5523+0.1557+0.5523X0.1557/5.644=0.7232将系统、二烧和2#发电机的电抗折算到三中央35KV侧，得:EY=l/7.3908+1/0.7232+1/0.12779+1/(-0.00625)=0.1353+1.3827+7.8253-160=-150.6567C=-150.6567X(-0.00625)=0.9416X7=7.3908X0.9416=6.9592X8=0.7232X0.9416=0.681Xl=0.12779X0.9416=0.1203

25X9=l.1693+0.2454=1.4147再将系统、二烧、2#发电机和梅塞尔的电抗折算到二中央1OKV侧，得:

26系统二尊舞m2跋电机梅塞尔SY=1/O.1203+1/6.9592+1/0.681+1/2.0505+1/0.2454=8.3126+0.1437+1.4684+0.4877+4.075=14.4874C=14.4874X0.2454=3.5552X7=6.9592X3.5552=24.7413X8=0.681X3.5552=2.4211Xl=0.1203X3.5552=0.4277XI0=2.0505X3.5552=7.2899三、简化等值电抗图：将各元件的电抗全部换算成计算电抗：系统:Xjs=0.4277

27二烧同步机：Xjs=24.7413X(3.2/0.9)/100=0.87972#发电机:Xjs=2.4211X37.5/100=0.90791#发电机:Xjs=l.1693X15/100=0.1754梅塞尔同步机：Xjs=7.2899X(10.7/0.95)/100=0.8211因此等值电抗图如下：

28二烧系统1穗电机落甥2麻电机海塞尔四、短路电流计算算：系统向短路点d-3提供的短路电流为：10=5.5/0.4277=12.8595KA二烧结3200KW同步机按XJS=0.8797查表用插值法求得：h=L2112,I02=l.1802；因此向短路点d-3提供的短路电流为11=1.2112X3.2/0.9/1.732X10=0.2486KA；1#发电机按“=0.1754查表用插值法求得：I2=6.1909,I0.2=4.0896；因此向短路点d-3提供的短路电流为12=6.1909X15/1.732X10.5=5.1063KA；2#发电机按Xj5=0.9079查表用插值法求得：1尸1.1432,I0.2=l.0466；因此向短路点d-3提供的短路电流为13=1.1432X37.5/1.732X10.5=2.3573KA；梅塞尔同步机按Xjs=0.8211查表用插值法求得：b=L3014,Io.2=L2569；因此向短路点d-3提供的短路电流为：14=1.3014X10.7/0.95/1.732X10=0.8463KA因此，短路点的短路电流为：『=10+11+12+13+14=12.8595+0.2486+5.1063+2.3573+0.8463=21.418KAIo.2=12.8595+1.2569X10.7/0.95/1.732X10+4.0896X15/1.732X10.5+1.1802X3.2/0.9/1.732X10+1.0466X37.5/1.732X10.5=12.8595+0.8174+3.3731+0.2423+2.1581=19.4504KA短路冲击电流为：%=L52X21.418=32.56KAich=2.55X21.418=54.62KA

29短路容量为：S'=1.732X21.418X10.5=389.45MVA短路电抗为：X*=5.5/21.418=0.2568二中央10KV很短路电流计算结果表短路点符号系统烧结1#发电机梅塞尔2#发电机总计中央10KV侧短路点、d-3EX0.427724.7411.16937.28992.4211Xjs0.42770.87970.17540.82110.9079I*"Z2.338091.21126.19091.30141.1432I*2.338091.18024.08961.25691.0466S"Z(MVA)233.8094.52192.86315.39142.87389.454InZ(KA)12.85950.24865.10630.84632.357321.418I(KA)12.85950.24233.37310.81742.158119.4504ich(KA)54.6159Ich(KA)32.5553第七节当二中央1#变带全部负荷时，二中央10KVI段短路电流计算运行方式：三中央1#变带梅塞尔、1#发电机、TRT、二烧结1#主风机3200KW、三烧结

30一、系统电抗图如下:二、各元件电抗值的换算：参照三中央35KV短路点d-2的短路电流计算，将系统、三烧、二烧和梅塞尔的电抗折算到35KV侧，得：Xl=0.1235X6”=2.6084X7”=5.8651X5'=2.0505等值电抗图如下：再将系统、三烧、二烧、梅塞尔、TRT和1#发电机的电抗折算到二中央10KV侧，得：LY=1/Xr+1/X6,,+1/X7,,+1/X5,+1/X4=1/0.1235+1/2.6084+175.8651+1/2.0505+1/0.2454=8.0972+0.3834+0.1705+0.4877+4.075=13,2138

31C=XYXX4=13.2138X0.2454=3.2427XI”=0.1235X3.2427=0.4005X6"'=2.6084X3.2427=8.4583X7"'=5.8651X3.2427=19.0188X5''=2.0505X3.2427=6.6492三、化简电抗等值电路：将各电抗折算成计算电抗：系统：Xjs=0.4005梅塞尔同步机：Xjs=6.6492X10.7/0.95/100=0.74891#发电机：Xjs=1.1693X15/100=0.1754TRT同步机：Xjs=1.3524X12.5/100=0.1691二烧结1#主风机3200KW：Xjs=l9.0188X3.2/0.9/100=0.6762三烧结同步机：Xjs=8.4583X8.002/100=0.6768四、短路电流计算：系统向短路点d-3提供的短路电流为：I0=5.5/0.4005=13.7328KA三烧结同步机：按Xjs=0.6768查表得：1=1.5915,10.2=1.4969因此向短路点提供的短路电流为：11=1.5915X8.002/1.732X10=0.7353二烧结同步机：按Xjs=0.6762查表得：1=1.593,10.2=1.4981因此向短路点提供的短路电流为：12=1.593X3.2/0.9/1.732X10=0.3271#发电机：按Xjs=0.1754查表得：1=6.2058,10.2=4.096因此向短路点提供的短路电流为：13=6.2058X15/1.732X10.5=5.1186TRT同步机：按Xjs=0.1691查表用插值法求得：b=6.4249,Io.2=419O4；因此向短路点提供的短路点电流为：14=6.4249X12.5/(1.732X10)=4.6369KA；

32梅塞尔同步机：按Xjs=0.7489查表得：1=1.4303,10.2=1.3649因此向短路点提供的短路电流为：I5=1.4303X10.7/0.95/1.732X10=0.9301因此，短路点d-3的短路电流为：I”=IO+I1+I2+I3+I4+15=13.7328+0.7353+0.327+5.1186+0.9301+4.6369=25.4807KA10.2=13.7328+1.4969X8.002/1.732X10+1.4981X3.2/0.9/1.732X10+4.096X15/1.732X10.5+1.3649X10.7/0.95/1.732X10+4.1904X12.5/1.732X10=13.7328+0.6916+0.3075+3.3784+0.8876+3.0242=22.0221KA短路冲击电流为：Ich=1.52X25.4807=38.73KAich=2.55X25.4807=64.98KA短路容量为：S'=1.732X10.5X25.4807=463.39MVA短路阻抗为：X*=5.5/25.4807=0.2158二匚「央10KV侧短路电流计算结果表短路点符号系统三烧结二烧结1#发电机TRT梅塞尔总计二中央10KV侧短路点d-3EX0.40058.458319.0191.16931.35246.6492Xjs0.40050.67680.67620.17540.16910.7489I*UZ2.49691.59151.5936.20586.42491.4303I*2.49691.49691.49814.0964.19041.3649S*'Z(MVA)249.6913.3725.946893.08784.32716.915463.337I”Z(KA)13.73280.73530.3275.11864.63690.930125.4807KKA)13.73280.69160.30753.37843.02420.887622.0221ich(KA)38.73Ich(KA)64.98

33第八节当二中央2#变带全部负荷时，二中央10KVII段短路电流计算运行方式：2#变带二烧结4000KW风机、2#发电机、TRT和1#发电机一、系统的电抗图：40D0KY风机二、各元件电抗值的换算:将二烧和2#发电机的电抗折算到绕组中压侧，得:二烧4000KW同步机2臧电机二烧4000即同步机X7'=X7+X2+X7XX2/X8=4.519+0.1562+4.519X0.1562/0.5523=5.9533X8'=X8+X2+X8XX2/X7=O.5523+O.l562+0.5523X0.1562/4.519=0.7276再将系统、二烧和2#发电机的电抗折算到35KV侧，得：EY=1/X1+1/X7'+1/X8'+1/X3=1/0.12979+1/5.9533+1/0.7276+1/(-0.00575)=7.7048+0.168+1.3744-173.913=-164.6658

34C=-l64.6658X(-0.00575)=0.9468Xr=0.12979X0.9468=0.1229X7”=5.9533X0.9468=5.6366X8''=0.7276X0.9468=0.6889再将系统、二烧、2#发电机、1#发电机和TRT的电抗折算到二中央10KV侧,得：£Y=1/X1"+1/X7”'+1/X8'"+1/X4=1/0.1229+1/5.6366+1/0.6889+1/0.2454=8.1367+0.1774+1.4516+4.075=13.8407C=SYXX4=13.8407X0.2454=3.3965X1"'=0.1229X3.3965=0.4174X7'"'=5.6366X3.3965=19.1447X8'"'=0.6889X3.3965=2.3398X9=1.3524三、化简等值电抗图：将各电抗换算成计算电抗：

35系统：Xjs=0.4174二烧结同步机：Xjs=19.1447X4/0.9/100=0.85092#发电机：Xjs=2.3398X37.5/100=0.8774TRT同步机：Xjs=1.3524X12.5/100=0.16911#发电机:Xjs=1.1693X15/100=0.1754系统二烧2状电机TRT1#发电机四、短路电流计算：系统向短路点d-3提供的短路电流为：I0=5.5/0.4174=13.1768KA二烧结同步机按Xjs=0.8509查表用插值法求得：12=1.2527,Io.2=1.2159；因此向短路点d-3提供的短路电流为：I1=1.2527X(4/0.9)/(1.732X10)=0.3215KA；2#发电机按Xjs=0.8774查表用插值法求得：12=1.1842,Io.2=1.O817；因此向短路点d-3提供的短路电流为：12=1.1842X37.5/(1.732X10.5)=2.4419KA；TRT同步机按Xjs=0.1691查表用插值法求得：L=6.4249,b.2=4.1904；因此向短路点d-3提供的短路电流为：13=6.4249X12.5/(1.732X10)=4.6369KA；1#发电机：按Xjs=0.1754查表得：1=6.2058,10.2=4.096因此向短路点d-3提供的短路电流为:14=6.2058XI5/1.732X10.5=5.1186；因此，短路点的短路电流为：r^IO+Il+12+13+14

36=13.1768+0.3215+2.4419+4.6369+5.1186=25.6957KAIo.2=13.1768+1.2159X4/0.9/1.732X10+1.0817X37.5/1.732X10.5+4.1904X12.5/1.732X10+4.096X15/1.732X10.5=13.1768+0.312+2.2305+3.0242+3.3784=22.1219KA短路冲击电流为：Ich=1.52X25,6957=39.06KAkh=2.55X25.6957=65.52KA短路容量为：S,=1.732X10.5X25.6957=467.3MVA短路阻抗为：X*=5.5/25.6957=0.214二中央10KV侧短路电流计算结果表短路点八八符号系统二烧结2#发电机TRT1#发电机总计二中央10KV侧短路点d-3XX0.417419.14472.33981.35241.3524Xjs0.41740.85090.87740.16910.1754I*''Z2.39581.25271.18426.42876.20581*2.39581.21591.08174.1924.096S''Z(MVA)239.585.84679944.4083984.3266693.08686467.2487I''Z(KA)13.17680.32152.44194.63695.118625.6957I(KA)13.17680.3122.23053.02423.378422.1219ich(KA)65.52Ich(KA)39.06第九节最小运行方式下短路电流计算最小运行方式为：2#主变带负荷（不包括同步机和发电机），系统阻抗为:

370.0020l+j0.0943,本计算以电抗为主。一、最小运行方式的系统图：系统三中央35KV二中央梅塞尔二、系统等值电抗图为：系统<0.0943<0.1099-0.00575(0,078640,23440.2517三中央二中央梅塞尔以上参数参照最大运行方式下的短路电流计算。三、等值电抗图：当二中央10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-3的总电抗标幺值为:SX=X1+X3+X4=0.2042+(-0.00575)+0.2454=0.44385基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：Imin=5.5/0.44385=12.3916KA

38系统Ic=1.52X12.3916=18.84KAic=2.55XI2.3916=31.6KA短路容量为:S=1.732X10.5XI2.3916=225.35MVA

39第三章三中央短路电流计算第一节三中央10KV最大运行方式短路电流计算一、计算依据：电业局提供三中央2005年度短路阻抗值,最大运行方式：0.00204+j0.01989,最小运行方式：0.0020l+j0.0943,本计算以电抗为主。由于三中央所带负荷有2#发电机、1#发电机、梅塞尔同步机、三烧同步机、二烧同步机和TRT同步机。因此以一台主变带全所负荷发电机并网为最大运行方式。（说明:虽然三中央已不存在一台变带全部负荷的时候，这种计算偏大,但只要计算出的值能满足最小的运行方式下的灵敏度即可,对个别不能满足灵敏度的再考虑取最常用的运行方式下的计算电流。故本次对三中央各种情况下的运行方式都做了计算）二、最大运行方式系统图：7000KV3200KW+4000KW37.5MVA三烧二烧2臧电机cos=0.87cos6=0.9cos4>=0.8Ie=462A20%12.6%lOOOOKtfTRT11.53%15MVA1极电机14.28%7400KV+3300KW梅塞尔cos4)=0.9520%三、各元件电抗计算：选取Sjz=100MVA,Uj产Upe=10.5于是：Ijz=Sjz/1.732Upe=100/1.732X10.5=5.5KA将各电抗根据基准容量归算，求出各元件电抗的基准标幺值:

40三中央三绕组1#变压器电抗值xl=l/2X(0.125+0.224—0.0856)=0.1317x2=1/2X(0.125+0.0856—0.224)=—0.0067x3=l/2X(0.224+0.0856—0.125)=0.0923标幺值分别为XBi=0.1317X100/120=0.1096Xb2=—0.0067X100/120=—0.0056Xb3=0.0923X100/120=0.0769二中央变压器X2b=0.0737X100/31.5=0.234梅塞尔变压器X3b=0.0793X100/31.5=0.2517电抗器三中央电抗器XK=Xke%/100XIjz/IkeXUMUpe=6/100X5.5/4X10/10.5=0.07862#发电机电抗器1#发电机电抗器TRT电抗器2#发电机电抗标幺值1#发电机电抗标幺值梅塞尔同步机电抗标幺值三烧同步机电抗标幺值二烧同步机电抗标幺值TRT同步机电抗标幺值电缆电抗标幺值三中央送三烧：X=0.01三中央送二烧：X=0.019Xk=0.12X5.5/3X10/10.5=0.2095XK=0.06X5.5/1.5X10/10.5=0.2095Xk=0.08X5.5/1X10/10.5=0.419X2jz=Xd%/l00XSd/Sn=12.6/100X100/30/0.8=0.336X,jz=14.28/100X100/15=0.952X=20%X100/(74+3.3)/0.95=1.776X=20%X100/7/0.87=2.5X=20%X100/(3.2+4)70.9=2.5X=0.1153X100/10/0.8=0.9224系统的电抗标幺值变压器的电抗XI=0.01989三中央送2#发电机：X=0.0073三中央送二中央：X=0.0114三中央送梅塞尔：X=0.0114二中央送TRT：X=0.011二中央送1#发电机：X=0.0078

41梅塞尔10KV配出：X=0.0114四、等值电路:系统0.019890.1096-0.0056三烧二烧2臧电机TRT1臧电机幅塞尔五、简化等值电路:将TRT和1#发电机的电抗折算到35KV侧，得:X3=1.3524+0.2454+1.3524X0.2454/1.1693=1.8816X4=l.l693+0.2454+1.1693X0.2454/1.3524=1.6269再将TRT、1#发电机和梅塞尔的电抗折算到绕组中压侧，得:

42-0.0056TRT1臧电机梅塞尔SY=l/Xl+l/X2+l/X3+l/X4=l/-0.0056+l/2.0505+l/1.8816+l/1.6269=-176.94C=—0,0056X(-176.94)=0.99X2=CXX2=0.99X2.0505=2.03X3=CXX3=0.99X1.8816=1.863X4=CXX4=0.99X1.6269=1.61将系统、TRT、1#发电机和梅塞尔的电抗折算到绕组低压侧，得：SY=1/Xi+1/X2，+1/X3，+1/X4，+1/X5,=1/0.12949+1/2.03+1/1.863+1/1.61+1/0.1555=15.8039C=0.1555X15.8039=2.458Xi'=2.458X0.12949=0.3183X2,,=2.458X2.03=4.9897X3，!=2.458X1.863=4.5793X4,,=2.458X1.61=3.9574全部换算成计算电抗系统：Xjs=0.3183梅塞尔：Xjs=4.9897X10.7/0.95/100=0.562TRT：Xjs=4.5793X10/0.8/100=0.5721#发电机：Xjs=3.9574X15/100=0.594三烧同步机：Xjs=2.51X1.732X10X462/100X103=0.20二烧同步机：Xjs=2.519X7.2/0.9/100=0.2022#发电机：Xjs=0.5523X37.5/100=0.207

43根据计算电抗画出等值电路系统三烧二烧2峨电机TRT1#发电机梅塞尔六、短路电流计算：系统向短路点d-1提供的短路电流为：I0=Ijz/X「=5.5/0.3183=17.28KA梅塞尔同步机按Xjs=0.562查表用插值法求得：h=L9312,1（）.2=1.7638；因此向短路点d-1提供的短路电流为11=1.9312X10.7/0.95/1.732X10=1.2559KA；三烧同步机按Xjs=0.2查表用插值法求得：b=5.526,1（）.2=3.856；因此向短路点d-1提供的短路电流为12=5.526X1.732X10X462/1.732X10X1（）3=2.5524KA；二烧同步机按Xj，=0.202查表用插值法求得：L=5.4789,10.2=3.8337；因此向短路点d-1提供的短路电流为13=5.4789X7.2/0.9/1.732X10=2.5307KA；TRT同步机按Xjs=0.572查表用插值法求得：b=L847,Io.2=1.6146；因此向短路点d-1提供的短路电流为14=1.847X10/0.8/1.732X10=1,3329KA；1#发电机按Xj，=0.582查表用插值法求得：b=L7678,10.2=1.5541；因此向短路点d-1提供的短路电流为I5=1.7678X15/1.732X10.5=1.5310KA；2#发电机按Xjs=0.207查表用插值法求得：b=5.2591,Io.2=3.6352；因此向短路点d-1提供的短路电流为16=5.2591X37.5/1.732X10.5=10.8444KA；故短路点d-1的短路电流为：r^IO+11+D+I3+I4+I5+I6=17.28+1.2559+1.3329+1.5310+10.8444+2.5524+2.5307=37.3273KA10.2=17.28+1.7638X10.7/0.95/1.732X10+1.6146X10/0.8/1.732X10+1.5541X15/1.732X10.5+3.6352X37.5/1.732X10.5+3.856X1.732X10X462/1.732X10X103+3.8337X7.2/0.9/1.732X10=17.28+1.147+1.165+1.282+7.496+1.782+1.771=31.923KA短路冲击电流：Ich=1.52X37.3273=56.74KAich=2.55X37.3273=95.18KA短路容量为：

44S=1.732X10.5X37.3273=678.83MVA短路阻抗：X*=5.5/37.3273=0.1473三中央10KV侧短路电流计算结果表短路点符弓系统三烧结二烧结2#发电机TRT1#发电机梅塞尔总计三中央10KV侧短路点EX0.31832.512.5190.55234.57933.95744.9897Xjs0.31830.20.2020.2070.5720.5940.562i*“z3.11175.5265.47895.25911.8-171.76781.9312I*3.14173.8563.83373.63521.61641.55411.7638SZMVA)314.1746.41846.023197.21624.2427.84322.84678.75FZ(KA)17.282.55242.530710.84441.33291.5311.255937.327KKA)17.281.7821.7717.4961.1651.2821.14731.923ich(KA)95.18Ich(KA)56.74第二节三中央10KVI段短路电流计算运行方式：1#变带梅塞尔、1#发电机、二烧结1#主风机3200KW、三烧结一、系统电抗图：二烧结1#主风机电抗值为：X=20%X100/3.2/0.9=5.625

45系统三烧同步机三掌程卬KW1#发电机海塞尔同步机二、各元件电抗值的换算：将1#发电机和梅塞尔的电抗折算到35KV侧，得:1雄:电机-0.00561.41472.0505■A/-海塞尔1嫉电机X2=2.0505-0.0056+2.0505X(-0.0056)/1.4147=2.0368X3=1.4147-0.0056+1.4147X(-0.0056)/2.0505=1.4054由系统电抗图得：E¥=1/0.12949+1/2.0368+1/1.4054+1/0.1555=7.7226+0.491+0.7115+6.4308=15.3559C=15,3559X0.1555=2,3878X,=0.12949X2.3878=0.3092X2=2.0368X2.3878=4.8635X3=1.4054X2.3878=3.3558三、简化等值电抗图：将各电抗换算成计算电抗：

46系统：Xjs=0.3092梅塞尔同步机：Xjs=4.8635X10.7/0.95/100=0.54781#发电机Xjs=3.3558X15/100=0.5034二烧结1#主风机3200KWXjs=5.644X3.2/0.9/100=0.2007三烧结同步机Xjs=2.51X1.732X10X462/100X103=0.20三提同系统诲塞尔1#发电机二烧3200KW同步机四、短路电流计算：系统向短路点d-1提供的短路电流为：I0=5.5/0.3092=17.79KA梅塞尔同步机按Xjs=0.5478查表用插值法求得：b=L983,Io.2=L8O32；因此向短路点d-1提供的短路电流为11=1.983X10.7/0.95/1.732X10=1,2895KA二烧结3200KW同步机按Xjs=0.2007查表用插值法求得：b=5.5095,Io.2=3.8482；因此向短路点d-1提供的短路电流为12=5.5095X3.2/0.9/1.732X10=1.131KA；1#发电机按Xjs=0.5034查表用插值法求得：b=2.0952,1（）.2=1.8012；因此向短路点d-1提供的短路电流为I3=2.0952X15/1.732X10.5=1.7281KA；三烧结同步机按Xjs=0.20查表用插值法求得：L=5.526,k.2=3.856；因此向短路点d-1提供的短路点电流为14=5.526X8.002/1.732X10=2.5524KA；因此，短路点的短路电流为：I''=I0+H+I2+I3+I4=17.79+1.2895+1.7281+1.131+2.5524=24.491KAIo.2=17.79+1.8O32X10.7/0.95/1.732X10+1.8012X15/1.732X10.5+3.8482X3.2/0.9/1.732X10+3.856X8.002/1.732X10=17.79+1.1726+1.4856+0.79+1.7815=23.0197KA短路冲击电流为：Ich=1.52X24.491=37.2263KAich=2.55X24.491=62.4521KA短路容量为：S=1.732X24.491X10.5=445.4MVA

47短路电抗为：X*=5.5/24.491=0.2246三中央10KV侧短路电流计算结果表短路占八、、符号系统三烧结二烧结I#发电机梅塞尔总计三中央10KV侧短路点d-1ZX0.3092.5193.6443.3564.864Xjs0.3090.2010.20.5030.548I*HZ3.2345.5265.512.0951.983I*3.2343.8563.8481.8011.803SUZ(MVA)323.446.4220.5731.4323.45445.28rZ(KA)17.792.5521.1311.7281.2924.491KKA)17.791.7820.791.4861.17323.02ich(KA)62.452Ich(KA)37.226第三节三中央10KVII段短路电流计算1运行方式：2#变带TRT、二烧结4000KW风机、2#发电机一、系统电抗图：二烧结4000KW风机电抗标幺值X=0.2X100/(4/0.9)=4.52#发电机的电抗标幺值X=O.126X100/37.5=0,336

48二、各元件电抗值的换算：将TRT和系统的电抗折算到三中央10KV侧，得:X1=l.592+0.1562+1.592X0.1562/0.12979=3.6641X2=0.12979+0.1562+0.12979X0.1562/1.592=0.2987三、简化等值电抗图：将各电抗值换算成计算电抗：系统：Xjs=0.2987TRT同步机：Xjs=3.6641X10/0.8/100=0.458二烧结4000KW同步机Xjs=(4.519X4/0.9)/100=0.20082#发电机Xjs=0.5523X37.5/100=0.207系统TRT同步机高整穿00Ktt2臧电机lwJiX***vL

49d-1四、短路电流的计算：系统向短路点d-1提供的短路电流为：10=5.5/0.2987=18.41KA二烧结4000KW同步机按Xjs=0.2008查表用插值法求得：L=5.5094KA,Io.2=3.848KA；因此向短路点d-1提供的短路电流为11=(5.5094X4/0.9)/1.732X10=1.4138KA；TRT同步机向按Xjs=0.458查表用插值法求得：I2=2.3129KA,Io.2=1.9577KA；因此向短路点d-1提供的短路电流为12=2.3129X10/0.8/1.732X10=1.6692KA；2#发电机按Xjs=0.207查表用插值法求得：b=5.2591KA,Io.2=3.6352KA；因此向短路点d-1提供的短路电流为13=5.2591X37.5/1.732X10.5=10.8444KA；因此，短路点d-1的短路电流为：r=I0+Il+I2+I3=18.41+1.6692+10.8444+1.4138=32.3374KAIo.2=18.41+1.9577X10/0.8/1.732X10+3.6352X37.5/1.732X10.5+3.848X4/0.9/1.732X10=18.41+1.4129+7.4959+0.9874=28.3062KAIc=1.52X32.3374=49.15KAic=2.55X32.3374=82.46KA短路容量为：S'=l.732X32.3374X10.5=588.08MVA短路电抗为：X*=5.5/32.3374=0.1701

50短路点符号系统二烧结2#发电机TRT总计二中央10KV侧短路点d-1XX0.29874.5190.55233.6641Xjs0.29870.20080.2070.458I*”z3.34785.50945.25912.3129I*3.34783.8483.63521.9577S"Z(MVA)334.7825.711197.21630.356588.064I"Z(KA)18.411.413810.84441.669232.3374KKA)18.410.98747.49591.412928.3062ich(KA)82.64Ich(KA)49.26第四节三中央10KVII段短路电流计算2运行方式：2#变带TRT、二烧结4000KW风机、三烧、2#发电机一、系统电抗图：二烧结4000KW风机电抗标幺值X=0.2X100/(4/0.9)=4.52#发电机的电抗标幺值X=O.126X100/37.5=0.336

51二、各元件电抗值的换算：将TRT和系统的电抗折算到三中央10KV侧，得:)0,29873.6641TRT同步机1一、TRT同步机系统Xi=1.592+0.1562+1.592X0.1562/0.12979=3.6641X2=0.12979+0.1562+0.12979X0.1562/1.592=0.2987三、简化等值电抗图：将各电抗值换算成计算电抗：系统：Xjs=0.2987TRT同步机：Xjs=3.6641X10/0.8/100=0.458二烧结4000KW同步机:Xjs=(4.519X4/0.9)/100=0.2008三烧同步机：Xjs=2.51X8.002/100=0.20082#发电机Xjs=0.5523X37.5/100=0.207四、短路电流的计算：系统向短路点d-1提供的短路电流为：10=5.5/0.2987=18.41KA二烧结4000KW同步机按Xjs=0.2008查表用插值法求得：L=5.5094KA,Io.2=3.848KA；因此向短路点d-1提供的短路电流为11=(5.5094X4/0.9)/1.732X10=1.4138KA；三烧结同步机按Xjs=0.2008查表用插值法求得：b=5.5094KA,Io.2=3.848KA；因此向短路点d-1提供的短路电流为12=(5.5094X8.002)/1.732X10=2.5454KA；TRT同步机向短路点d-1提供的短路点电流，按Xjs=0.458查表用插值法求得：

52b=2.3129KA,Io,2=L9577KA；因此向短路点d-1提供的短路电流为13=2.3129X10/0.8/1.732X10=1.6692KA；2#发电机向短路点d-1提供的短路点电流，按Xjs=0.207查表用插值法求得：b=5.259IKA,Io.2=3.6352KA；因此向短路点d-1提供的短路电流为14=5.2591X37.5/1.732X10.5=10.8444KA；因此，短路点d-1的短路电流为：I"=10+11+12+13+14=18.41+1.6692+10.8444+1.4138+2.5454=34.8828KA10.2=18.41+1.9577X10/0.8/1.732X10+3.6352X37.5/1.732X10.5+3.848X4/0.9/1.732X10+3.848X8.002/1.732X10=18.41+1.4129+7.4959+0.9874+1.7778=30.084KAIc=1.52X34.8828=53.02KAic=2.55X34.8828=88.95KA短路容量为：S'=1.732X34.8828X10.5=634.38MVA短路电抗为：X*=5.5/34.8828=0.1577三中央10KV侧短路电流计算结果表短路占八、、符号系统二烧结三烧结2#发电机TRT总计三中央10KV侧短路点d-1XX0.29874.5192.510.55233.6641邓0.29870.20080.20080.2070.458I*MZ3.34785.50945.50945.25912.3129I*3.34783.8483.8483.63521.9577S"Z(MVA)334.7825.71146.291197.21630.356634.354I"Z(KA)18.411.41382.545410.84441.669234.8828I(KA)18.410.98741.77787.49591.412930.084ich(KA)88.9511|Ich(KA)||||||53.0219|

53第五节当三中央0#变代替1#变运行时三中央10KVI段短路电流计算1运行方式：0#变带梅塞尔、1#发电机、2#发电机、二烧3200KW风机、三烧一、0#主变电抗标幺值计算：三中央0#变短路电抗：高压-中压：12.2%；高压-低压：22.2%中压-低压：8.5%0#变压器电抗值xl=l/2X(0.122+0.222—0.085)-0.1295x2=l/2X(0.122+0.085—0.222)=-0.0075x3=l/2X(0.222+0.085—0.122)=0.0925标幺值分别为XBI=0.1295X100/120=0.1079Xb2=-o.0075X100/120=-0.00625Xb3=0.0925X100/120=0.0771二、系统电抗图:

54系统0.019890.1079-0.00625三烧二烧2穗电机0.01140.2340.00780.20gs0.9521#发电机0.01140.25170.0114>1.776福塞尔三、各元件电抗值换算：Xl=0.01989+0.1079-0.12779X2=0.0771+0.0786=0.1557X6=0.01+2.5=2.51X7=5.625+0.019=5.644X8=0.336+0.21+0.0073=0.5523X9=0.952+0.2095+0.0078-1.1693X10=l.776+0.0114=1.7874X9'=1.1693+0.2454=1.4147

55X10'=1.7874+0.2631=2.0505将1#发电机和梅塞尔的电抗折算到绕组中压侧，得:1#发电机1#发电机悔塞尔X9'=2.0505-0.00625+2.0505X(-0.00625)/1.4147=2.0352X10'=1.4147-0.00625+1.4147X(-0.00625)/2.0505=1.4041将系统、1#发电机和梅塞尔的电抗折算到三中央10KV侧，得:ZY=1/O.12779+1/2.0352+1/1.4041+1/0.1557=7.8253+0.4914+0.7122+6.4226=15.4515C=15.4515X0.1557=2.4058X,=0.12779X2.4058=0.3074X9=2.0352X2.4058=4.8963X10=l.4041X2.4058=3.378四、简化等值电抗图：将各元件的电抗全部换算成计算电抗：系统：Xjs=O.30741#发电机：Xjs=4.8963X15/100=0.7344梅塞尔同步机：Xjs=3.378X(10.7/0.95)/100-0.3805

56三烧同步机：Xjs=2.51X8.002/100=0.2二烧同步机：Xjs=5.644X3.2/0.9/100=0.20072#发电机:Xjs=0.5523X37.5/100=0.2071因此等值电抗图如下：二烧_系统1线电机谶费赢同2辍电机梅塞尔五、短路电流计算：系统向短路点d-1提供的短路电流为：10-5.5/0.3074=17.892KA二烧结3200KW同步机按Xjs=0.2007查表用插值法求得：L=5.5095,Io.2=3.8482；因此向短路点d-1提供的短路电流为11=5.5095X3.2/0.9/1.732X10=1.131KA；1#发电机按XjO.7344查表用插值法求得：12=1.4218,I0.2=l.2789；因此向短路点d-1提供的短路电流为12=1.4218X15/1.732X10.5-1.1727KA；三烧结同步机按Xg=O.20查表用插值法求得：L=5.526,10.2=3.856：因此向短路点d-1提供的短路电流为13=5.526X8.002/1.732X10=2.5524KA；2#发电机按X"=0.2071查表用插值法求得：k=5.2591KA,I0,2=3.6352KA；因此向短路点d-1提供的短路电流为14=5.2591X37.5/1.732X10.5=10.8444KA；梅塞尔同步机按Xjs=0.3805查表用插值法求得：I2=2.9291,I02=2.4614；因此向短路点d-1提供的短路电流为15=2.9291X(10.7/0.95)/1.732X10=1.9048KA；因此，短路点的短路电流为：r'=10+11+12+13+14+15=17.892+1.131+1.1727+2.5524+10.8444+1.9048=35.4973KAIo.2=17.892+2.4614X(10.7/0.95)/I.732X10+1.2789X15/1.732X10.5+3.8482X3.2/0.9/1.732X10+3.856X8.002/1.732X10+3.6352X37.5/1.732X10.5=17.892+1.6006+1.0548+0.79+1.7815+7.4959=30.6148KA短路冲击电流为：Lh=L52X35.4973=53.96KAich=2.55X35.4973=90.52KA短路容量为：S'=1.732X35.4973X10.5=645.55MVA短路电抗为：X*=5.5/35.4973=0.1549

57三中央10KV侧短路电流计算结果表短路点符号系统二烧结2#发电机三烧1#发电机梅塞尔总“三中央1OKV侧短路点d-1EX0.30745.6440.55232.514.89633.378Xjs0.30740.20070.20710.20.73440.3805I*'Z3.25315.50955.25915.5261.42182.9291I*3.25313.84823.63523.8561.27892.4614SnZ(MVA)325.3120.568197.21646.41821.32734.641645.48FZ(KA)17.8921.13110.84442.55241.17271.904835.497I(KA)17.8920.797.49591.78151.05481.600630.615ich(KA)90.518Ich(KA)53.956第六节当三中央0#变代替1#变运行时三中央10KVI段短路电流计算2运行方式：0#变带梅塞尔、1#发电机、2#发电机、二烧3200KW风机一、o#主变电抗标幺值计算：三中央0#变短路电抗：高压-中压：12.2%；高压-低压：22.2%中压-低压：8.5%0#变压器电抗值

58标幺值分别为xl=l/2X(0.122+0.222—0.085)-0.1295x2=l/2X(0.122+0.085—0.222)=-0.0075x3=l/2X(0.222+0.085—0.122)=0.0925Xb^O.1295X100/120=0.1079Xb2=-0.0075X100/120=-0.00625Xb3=0.0925X100/120=0.0771二、系统电抗图:系统O.019890.1079-0.00625二烧2穗电机<0.0078\0.0114jO.2095J?S1.776?0.9521样发电机梅塞尔三、各元件电抗值换算：Xl=0.01989+0.1079=0.12779X2=0.0771+0.0786=0.1557X6=0.01+2.5=2.51X7=5.625+0.019=5.644X8=0.336+0.21+0.0073=0.5523X9=0.952+0.2095+0.0078-1.1693X10=l.776+0.0114=1.7874

59系统3200KW同步机I#发电机1线电机图2X9'=1.1693+0.2454=1.4147X10*=1.7874+0.2631=2.0505将1#发电机和梅塞尔的电抗折算到绕组中压侧，得:1.40412.0352—X/—梅塞尔由图2到图3化简：X9'=2.0505-0.00625+2.0505X(-0.00625)/1.4147=2.0352X10*=1.4147-0.00625+1.4147X(-0.00625)/2.0505=1.4041将系统、1#发电机和梅塞尔的电抗折算到三中央10KV侧，得:

600.155TSY=1/O.12779+1/2.0352+1/1.4041+1/0.1557=7.8253+0.4914+0.7122+6.4226=15.4515C=15.4515X0.1557=2.4058X,=0.12779X2.4058=0.3074X9=2.0352X2.4058=4.8963X10=l.4041X2.4058=3.378四、简化等值电抗图：将各元件的电抗全部换算成计算电抗：系统:Xjs=0.30741#发电机:Xjs=4.8963X15/100=0.7344梅塞尔同步机：Xjs=3.378X(10.7/0.95)/100=0.3805二烧同步机:Xjs=5.644X3.2/0.9/100=0.20072#发电机:Xjs=0.5523X37.5/100=0.2071因此等值电抗图如下：二烧系统1#发电机看挈北2峨电机梅塞尔

61五、短路电流计算：系统向短路点d-1提供的短路电流为：10=5.5/0.3074=17.892KA二烧结3200KW同步机按Xjs=0.2007查表用插值法求得：12=5.5095,Io.2—3.8482；因此向短路点d-1提供的短路电流为11=5.5095X3.2/0.9/1.732X10=1.131KA；1#发电机按4=0.7344查表用插值法求得：b=L4218,I。♦2=1.2789；因此向短路点d-1提供的短路电流为12=1.4218X15/1.732X10.5=1.1727KA；2#发电机按A»=0.2071查表用插值法求得：I2=5.259IKA,I02=3.6352KA；因此向短路点d-1提供的短路电流为13=5.2591X37.5/1.732X10.5=10.8444KA；梅塞尔同步机按X”=0.3805查表用插值法求得：b=2.9291,102=2.4614；因此向短路点d-1提供的短路电流为14=2.9291X(10.7/0.95)/1.732X10=1.9048KA；因此，短路点的短路电流为：r'=10+11+12+13+14=17.892+1.131+1.1727+10.8444+1.9048=32.9449KAIo.2=17.892+2.4614X(10.7/0.95)/I.732X10+1.2789X15/1.732X10.5+3.8482X3.2/0.9/1.732X10+3.6352X37.5/1.732X10.5=17.892+1.6006+1.0548+0.79+7.4959=28.8333KA短路冲击电流为：Ich=l.52X32.9449=50.08KAL=2.55X32.9449=84.01KA短路容量为：S'=1.732X32.9449X10.5=599.14MVA短路电抗为：X*=5.5/32.9449=0.1669

62三中央10KV侧短路电流计算结果表短路点符号系统二烧结2#发电机1#发电机梅塞尔总计—'中央IOKV侧短路点d-1LX0.30745.6440.55234.89633.378Xjs0.30740.20070.20710.73440.3805I*"Z3.25315.50955.25911.42182.9291I*3.25313.84823.63521.27892.4614SnZ(MVA)325.3120.568197.21621.32734.641599.061InZ(KA)17.8921.13110.84441.17271.904832.9449I(KA)17.8920.797.49591.05481.600628.8333ich(KA)84.0095Ich(KA)50.0762第七节当三中央1#变加带TRT时，三中央10KVI段短路电流计算运行方式：1#变带梅塞尔、1#发电机、TRT、二烧结1#主风机3200KW、三烧结（即二中央由1#主变带全部负荷）一、系统电抗图:32OOKW电机TRT同步机

63二、各元件电抗值的换算：参照三中央10KV短路点d-1的短路电流计算，将TRT和1#发电机的电抗折算到35KV侧，得：0.2454TRT1.35241.1693―\/^［拔电机X3=1.3524+0.2454+1.3524X0.2454/1.1693=1.8816X4=l.l693+0.2454+1.1693X0.2454/1.3524=1.6269再将TRT、1#发电机和梅塞尔的电抗折算到绕组中压侧，得:SY=1/X1+1/X2+1/X3+1/X4=1/-0.0056+1/2.0505+1/1.8816+1/1.6269=-176.94C=—0.0056X(-176.94)=0.99X2=CX2=0.99X2.0505=2.03X3'=CX3=0.99X1.8816=1.863X4=CX4=0.99X1.6269=1.61将系统、TRT、1#发电机和梅塞尔的电抗折算到绕组低压侧，得：SY=1/Xi+1/X2，+1/X3，+1/X4,+1/X5,=1/0.12949+1/2.03+1/1.863+1/1.61+1/0.1555=15.8039C=0.1555X15.8039=2.458Xi=2.458X0.12949=0.3183

64X2,,=2.458X2.03=4.9897X3,,=2.458X1.863=4.5793X4，!=2.458X1.61=3.9574三、简化等值电抗图：将各电抗折算成计算电抗:系统：梅塞尔同步机：1#发电机：TRT同步机：二烧结1#主风机3200KW：三烧结同步机：根据计算电抗画出等值电路Xjs=0.3183Xjs=4.9897X10.7/0.95/100=0.562Xjs=3.9574X15/100=0.594Xjs=4.5793X12.5/100=0.572Xjs=5.644X3.2/0.9/100=0.201Xjs=2.51X8.002/100=0.20系统三烧二烧TRT1#发电机梅塞尔四、短路电流计算：系统向短路点d-1提供的短路电流为：I0=5.5/0.3183=17.2793KA三烧同步机按Xjs=0.2查表用插值法求得：L=5.526,Io.2=3.856；因此向短路点d-1提供的短路电流为11=5.526X1.732X10X462/1.732X10X1()3=2.5524KA；二烧同步机按Xjs=0.201查表用插值法求得：12=5.4789,10.2=3.8337；因此向短路点d-1提供的短路电流为12=5.4789X3.2/0.9/1.732X10=1.1247KA；

65TRT同步机按Xjs=0.572查表用插值法求得：b=L847,M.2=L6146；因此向短路点d-1提供的短路电流为13=1.847X10/0.8/1.732X10=1.3329KA；1#发电机按Xjs=0.594查表用插值法求得：L=L7678,10.2=1.5541；因此向短路点d-1提供的短路电流为14=1.7678XI5/1.732义10.5=1.531KA；梅塞尔同步机按Xjs=0.562查表用插值法求得：b=L9312,Io.2=L7638；因此向短路点d-1提供的短路电流为15=1.9312X10.7/0.95/1.732X10=1.2559KA；因此，短路点d-1的短路电流为：1),=10+11+12+13+14+15=17.2793+2.5524+1.1247+1.3329+1.531+1.2559=25.307KA10.2=17.2793+3.856X8.002/1.732X10+3.8337X3.2/0.9/1.732X10+1.5541X15/1.732X10.5+1.7638X10.7/0.95/1.732X10+1.6146X12.5/1.732X10=17.2793+1.7815+0.787+1.2818+1.147+1.1653=23.671KA短路冲击电流为：Ich=1.52X25.307=38.466KAich=2.55X25.307=64.533KA短路容量：S'=1.732X10.5X25.307=460.16MVA短路阻抗为：X*=5.5/25.307=0.2173三中央10KV侧短路电流计算结果表短路点符号系统三烧结二烧结1#发电机梅塞尔TRT总计三中央10KV侧短路点d-1XX0.31832.515.6443.3564.8644.579Xjs0.31830.20.2010.5030.5480.572I*HZ3.141695.5265.47892.0951.9831.847I*3.141693.8563.83371.8011.8031.615SnZ(MVA)314.16946.41820.45431.4323.4524.24460.16IMZ(KA)17.27932.55241.12471.7281.291.33325.307KKA)17.27931.78150.7871.4861.1731.16523.671ich(KA)64.533Ich(KA)38.466

66第八节当三中央2#变加带1#发电机时，三中央10KVII段短路电流计算运行方式：2#变带二烧结4000KW风机、2#发电机、TRT和1#发电机一、系统电抗图：012979-0005751562,

67C=15.2605x0.1562=2.3837Xr=0.12979X2.3837=0.3094X3'=1.8692X2.3837=4.4556X4'=1.6162X2.3837=3.8525系统TRT1#发电机简化等值电抗图:将各电抗换算成计算电抗:系统：Xjs=0.3094二烧结同步机：Xjs=4.519X4/0.9/100=0.2012#发电机：Xjs=0.5523X37.5/100=0.207TRT同步机：Xjs=4.4556X12.5/100=0.5571#发电机：Xjs=3.8525X15/100=0.5779四、短路电流计算：系统向短路点d-1提供的短路电流为：10=5.5/0.3094=17.7663KA二烧结4000KW同步机按Xjs=0.201查表用插值法求得：b=5.5094KA,Io.2=3.848KA；因此向短路点d-1提供的短路电流为11=(5.5094X4/0.9)/1.732X10=1.4138KA；2#发电机按Xjs=0.207查表用插值法求得：12=5.2591KA,Io.2=3.6352KA；因此向短路点d-1提供的短路电流为12=5.2591X37.5/1.732X10.5=10.8444KA；TRT同步机按Xjs=0.557查表用插值法求得：b=L8899,Io.2=L6474；因此向短路点d-1提供的短路电流为：b=L8899X12.5/(1.732X10)=1.364KA；1#发电机：按Xjs=0.5779查表得：1=1.8209,10.2=1.5947因此向短路点提供的短路电流为：14=1.8209X15/1.732X10.5=1.5019；

68因此，短路点的短路电流为：r^IO+Il+12+13+14=17.7663+1.4138+10.8444+1.364+1.5019=32.8904KAIo.2=17.7663+3.848X4/0.9/1.732X10+3.6352X37.5/1.732X10.5+1.6474X12.5/1.732X10+1.5947X15/1.732X10.5=17.7663+0.9874+7.4959+1.1889+1.3153=28.7538KA短路冲击电流为：Ich=1.52X32.8904=50KA32.55X32.8904=83.87短路容量为：S'=1.732X10.5X32.8904=598.14短路阻抗为：X*=5.5/32.8904=0.1672三中央10KV侧短路电流计算结果表短路占/、、、符号系统二烧结2#发电机TRT1#发电机总计三中央10KV侧短路点d-1XX0.30944.5190.55234.45563.8525Xjs0.30940.2010.2070.5570.5779I**Z3.232065.50945.25911.88991.82091*3.232063.8483.63521.64741.5947S"Z(MVA)323.20625.711197.21624.80627.314598.253I"Z(KA)17.76631.413810.84441.3641.501932.8904I(KA)17.76630.98747.49591.18891.315328.7538ich(KA)83.8705Ich(KA)49.9934

69第九节三中央35KV最大运行方式下短路电流计算、系统电抗图:二、各元件电抗值的换算：将三烧、二烧和2#发电机的电抗折算到中压绕组侧，得：SY=1/X2+1/X6+1/X7+1/X8=1/0.1555+1/2.51+1/2.519+1/0.5523=6.4309+0.3984+0.397+1.8106=9.0369C=X2XXY=0.1555X9.0369=1.4052X6=X6XC=2.51X1.4052=3.5271X7'=X7XC=2.519X1.4052=3.5397X8'=X8XC=0.5523X1.4052=0.7761等值电抗图如下：将TRT和1#发电机的电抗折算到短路点，得：X9'=X9+X4+X9XX4/X10=l.3524+0.2454+1.3524X0.2454/1.1693=1.8816

70X1O'=X10+X4+X10XX4/X9=1.1693+0.2454+1.1693X0.2454/1.3524=1.6269等值电路图如下：将系统、三烧、二烧和2#发电机的电抗折算到短路点，得:LY=1/X1+1/X3+1/X6,+1/X7,+1/X8,=1/0.12949+1/-0.0056+1Z3.5271+1/3.5397+1/0.7761=-169C=X3XEY=-0.0056X(-169)=0.9464Xr=XlXC=0.12949X0.9464=0.1225X6"=X6'XC=3.5271X0.9464=3.338X7''=X7'XC=3.5397X0.9464=3.35X8"=X8'XC=0.7761X0.9464=0.7345等值电抗图图如下：三、简化等值电抗图：将各电抗值换算成计算电抗：系统：Xjs=0.1225三烧结同步机：Xjs=3.338X8.002/100=0.2671二烧结同步机：Xjs=3.35X7.2/0.9/100=0.268

712#发电机：Xjs=0.7345X37.5/100=0.2754TRT同步机：Xjs=l.8816X10/0.8/100=0.23521#发电机：Xjs=1.6269X15/100=0.244梅塞尔同步机：Xjs=2.0505X10.7/0.95/100=0.231系统三烧二烧2裱:电机TRT1#发电机梅塞尔四、短路电流计算：基准电流为：Ijz=l00/1.732X37=1.5605KA系统向短路点d-2提供的短路电流为：10=1.5605/0.1225=12.7384KA三烧结同步机：按Xjs=0.2671查表得：1=4.1846,10.2=3.1973因此向短路点提供的短路电流为：11=4.1846X8.002/1.732X35=0.5524二烧结同步机：按Xjs=0.268查表得：1=4,1712,10.2=3.1902因此向短路点提供的短路电流为：12=4.1712X7.2/0.9/1.732X35=0.55052#发电机:按Xjs=0.2754查表得：1=3.9485,10.2=2.9808因此向短路点提供的短路电流为：13=3.9485X37.5/1.732X35=2.4426TRT同步机：按Xjs=0.2352查表得：1=4.629,10.2=3.3363因此向短路点提供的短路电流为：I4=4.629X10/0.8/1.732X35=0.95451#发电机：按Xjs=0.244查表得：1=4.4564,10.2=3.25因此向短路点提供的短路电流为：15=4.4564X15/1.732X35=1.1027梅塞尔同步机：按Rs=0.231查表得：1=4.8306,10.2=3.523因此向短路点提供的短路电流为：I6=4.8306X10.7/0.95/1.732X35=0.8975因此，短路点d-2的短路电流为：I”=IO+I1+I2+I3+I4+I5+I6=12.7384+0.5524+0.5505+2.4426+0.9545+1.1027+0.8975=19.2386KA10.2=12.7384+3.1973X8.002/1.732X35+3.1902X7.2/0.9/1.732X35+2.9808X37.5/1.732X35+3.3363X10/0.8/1.732X35+3.25X15/1.732X35+3.523X10.7/0.95/1.732X35

72=12.7384+0.4221+0.421+1.8439+0.688+0.8042+0.6546=17.5722KA短路冲击电流为：Ich=1.52X19.2386=29.2427KAich=2.55X19.2386=49.0584KA短路容量：S=1.732X37X19.2386=1232.886MVA短路电抗为：X*=1.5605/19.2386=0.0811三中央35KV恻短路电流计算结果表短路点符弓系统三烧结二烧结2#发电机TRTI#发电机梅施尔总计三中央35KV侧短路点d-2EX0.12253.3383.350.73451.88161.62692.0505Xjs0.12250.26710.2680.27540.23520.2440.231I*''Z8.16334.18464.17123.94854.6294.45644.8306I*8.16333.19733.19022.98083.33633.253.523S''Z(MVA)816.3335.435.278156.5361.16870.66557.51541232.89I''Z(KA)12.73840.55240.55052.44260.95451.10270.897519.2386I(KA)12.73840.42210.1211.84390.6880.80420.654617.5722ich(KA)49.0584Ich(KA)29.2427第十节三中央35KVI段短路电流计算运行方式：1#变带三烧结、二烧结1#主风机3200KW、1#发电机、梅塞尔一、系统电抗图：二烧结3200KW风机电抗标幺值X=20%X100/(3.2/0.9)=5.625

73二、各元件电抗值换算：将三烧和二烧的电抗折算到绕组中压侧，得:二烧320前风机二烧320充tf风机6.14922.7347三烧X6'=X6+X2+X6XX2/X7=2.51+0.1555+2.51X0.1555/5.644=2.7347X7'=X7+X2+X7XX2/X6=5.644+0.1555+5.644X0.1555/2.51=6.1492再将系统、二烧和三烧的电抗折算到35KV侧，得：SY=1/X1+1/X6,+1/X7,+1/X3=1/0.12949+1Z2.7347+1/6.1492+1/(-0.0056)=-170.32C=-170.32X(-0.0056)=0.9538Xr=0.12949X0.9538=0.1235X7”=2.7347X0.9538=2.6084X8”=6.1492X0.9538=5.8651

74三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.1235三烧结同步机：Xjs=2.6084X8.002/100=0.2087二烧结同步机:Xjs=5.8651X3.2/0.9/100=0.20851#发电机：Xjs=1.4147X15/100=0.2122梅塞尔同步机：Xjs=2.0505X10.7/0.95/100=0.231四、短路电流计算：基准电流为：Ijz=100/(1.732X37)=1.5605KA系统向短路点(1-2提供的短路电流为：I0=1.5605/0.1235=12.6356KA三烧结同步机按Xjs=0.2087查表用插值法求得：12=5.3211,Io,2=3.759；因此向短路点d-2提供的短路电流为：11=5.3211X8.002/(1.732X35)=0.7024KA；二烧结3200KW同步机按Xjs=0.2085查表用插值法求得：b=5.3258,Io.2=3.7612；因此向短路点d-2提供的短路电流为：12=5.3258X(3.2/0.9)/(1.732X35)=0.3124KA；1#发电机按Xjs=0.2122查表用插值法求得：b=5.1356,Io.2=3.5782；

75因此向短路点d-2提供的短路电流为：13=5.1356X15/(1.732X35)=1.2708KA；梅塞尔同步机按Xjs=0.231查表用插值法求得：b=4.8306,匕2=3.523；因此向短路点d-2提供的短路电流为：14=4.8306义(10.7/0.95)/(1.732X35)=0.8975KA因此，短路点的短路电流为：I”=I0+n+I2+I3+I4=12.6356+0.7024+0.3124+1.2708+0.8975=15.8187KAIo.2=12.6356+3.759X8.002/1.732X35+3.7612X3.2/0.9/1.732X35+3.5782X15/1.732X35+3.523X10.7/0.95/1.732X35=12.6356+0.4962+0.2206+0.8854+0.6546=14.8924KA短路冲击电流为：Ich=1.52X15.8187=24.0444KA徐=2.55X15.8187=40.3377KA短路容量为：S,=1.732X37X15.8187=1013.73MVA短路阻抗为：X*=1.5605/15.8187=0.0987三中央35KV侧短路电流亡卜算结果表短路点符号系统三烧结二烧结1#发电机梅塞尔总计三中央35KV侧短路点d-2LX0.12352.60845.86511.41472.0505Xjs0.12350.20870.20850.21220.231I*''Z8.09725.32115.32585.13564.8306I*8.09723.7593.76123.57823.523S，，Z(MVA)809.7245.01320.0281.43857.5151013.71I"Z(KA)12.63560.70240.31241.27080.897515.8187I(KA)12.63560.49620.22060.88540.654614.8924ich(KA)40.3377Ich(KA)24.0444

76第H^一节三中央35KVII段短路电流计算1运行方式：2#变带二烧结4000KW风机、2#发电机、TRT一、系统电抗图如下：2#主变的电抗为:xl=l/2X(0.125+0.225—0.0862)=0.1319x2=l/2X(0.125+0.0862—0.225)=—0.0069x3=l/2义(0.225+0.0862—0.125)=0.0931标幺值分别为XB1=0.1317X100/120=0.1099Xb2=—0.0067X100/120=—0.00575加=0.0923X100/120=0.0776=施400010*同唐机2#^：电机TRT二、各元件电抗值换算：二烧4000KW同步机二烧4000KW同步机将二烧和2#发电机的电抗折算到绕组中压侧，得:5.95330.7276-2嫉电机X7'=X7+X2+X7XX2/X8=4.519+0.1562+4.519X0.1562/0.5523=5.9533X8'=X8+X2+X8XX2/X7=0.5523+0.1562+0.5523X0.1562/4.519=0.7276再将系统、三烧和2#发电机的电抗折算到35KV侧，得：SY=1/X1+1/X7,+1/X8,+1/X3

77=1/0.12979+1/5.9533+1/0.7276+1/(-0.00575)=7.7048+0.168+1.3744-173.913=-164.6658C=-l64.6658X(-0.00575)=0.9468Xr=0.12979X0.9468=0.1229X8”=5.9533X0.9468=5.6366X9”=0.7276X0.9468=0.6889三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.1229二烧结同步机：Xjs=5.6366X4/0.9/100=0.25042#发电机：Xjs=0.6889X37.5/100=0.2583TRT同步机：Xjs=1.5978X12.5/100=0.1997四、短路电流计算：系统向短路点d-2提供的短路电流为：I0=1.5605/0.1229=12.6973KA二烧结同步机按Xj$=0.2504查表用插值法求得：12=4.4614,Io.2=3.3394；因此向短路点d-2提供的短路电流为：11=4.4614义(4/0.9)/(1.732X35)=0.3271KA；2#发电机按Xj‘=0.2583查表用插值法求得：b=4.2076,Io.2=3.⑵3；因此向短路点d-2提供的短路电流为：12=4.2076义37.5/(1.732X35)=2.6029KA；TRT同步机按Xj’=0.1997查表用插值法求得：12=5.4408,10.2=3.7195；

78因此向短路点d-2提供的短路电流为：13=5.4408X12.5/(1.732X35)=1.1219KA；因此，短路点的短路电流为：I"=10+11+12+13=12.6973+0.3271+2.6029+1.1219=16.7492KA10.2=12.6973+3.3394X4/0.9/1.732X35+3.1213X37.5/1.732X35+3.7195X12.5/1.732X35=12.6973+0.2448+1.9309+0.767=15.64KA短路冲击电流为：Ich=1.52X16.7492=25.4588KAich=2.55X16.7492=42.7105KA短路容量为：S'=l.732X37X16.7492=1073.37MVA短路阻抗为：X*=1.5605/16.7492=0.0932三中央35KV侧短路目目流计算结果表短路点符号系统二烧结2#发电机TRT总计三中央35KV侧短路点d-2ZX0.12295.63660.68891.5978Xjs0.12290.25040.25830.1997I*''Z8.13674.46144.20765.44081*8.13673.33943.12133.7159S''Z(MVA)813.6720.962166.80471.8961073.33I"Z(KA)12.69730.32712.60291.121916.7492I(KA)12.69730.24481.93090.76715.64ich(KA)42.7105Ich(KA)25.4588

79第十二节三中央35KVII段短路电流计算2运行方式：2#变带二烧结4000KW风机、三烧、2#发电机、TRT一、系统电抗图如下：2#主变的电抗为：xl=l/2X(0.125+0.225—0.0862)=0.1319x2=l/2X(0.125+0.0862—0.225)=—0.0069x3=l/2X(0.225+0.0862—0.125)=0.0931标幺值分别为Xm=0.1317X100/120=0.1099加=—0.0067X100/120=—0.00575h=0.0923X100/120=0.0776二、各元件电抗值换算：将三烧、二烧和2#发电机的电抗折算到绕组中压侧，得:

80£Y=l/2.51+1/4.519+1/0.5523+1/0.1562=0.3984+0.2213+1.8106+6.402=8.8323C=8.8323X0.1562=1.3796X6=2.51X1.3796=3.4628X7=4.519X1.3796=6.2344X8=0.5523X1.3796=0.762-0.00575将系统、三烧、二烧和2#发电机的电抗折算到三中央35KV侧，得:系统三烧二繇产2峨电机旧」27优A).12979?4628g2344/0.762EY=l/3.4628+1/6.2344+1/0.762+1/0.12979+1/(-0.00575)=0.2888+0.1604+1.3123+7.7048-173.913=-164.4467C=-164.4467X(-0.00575)=0.9456X6=3.4628X0.9456=3.2744X7=6.2344X0.9456=5.8952X8=0.762X0.9456=0.7205Xl=0.12979X0.9456=0.1227X9=l.3524+0.2454=1.5978三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.1227三烧结同步机：Xjs=3.2744X8.002/100=0.262二烧结同步机：Xjs=5.8952X4/0.9/100=0.2622#发电机：Xjs=0.7205X37.5/100=0.2702TRT同步机：Xjs=1.5978X12.5/100=0.1997

81系统二烧2峨电机TRT三烧四、短路电流计算：系统向短路点d-2提供的短路电流为：I0=1.5605/0.1227=12.718KA二烧结同步机按Xjs=0.262查表用插值法求得：12=4.2603,10.2=3.2373；因此向短路点d-2提供的短路点电流为：11=4.2603X(4/0.9)/(1.732X35)=0.3124KA；三烧结同步机按Xjs=0.262查表用插值法求得：12=4.2603,Io.2=3.2373；因此向短路点d-2提供的短路点电流为：12=4.2603X8.002/(1.732X35)=0.5624KA；2#发电机按Xjs=0.2702查表用插值法求得：b=4.0219,Io.2=3.O2O8；因此向短路点d-2提供的短路点电流为：13=4.0219X37.5/(1.732X35)=2.488KA；TRT同步机按Xjs=0.1997查表用插值法求得：L=5.4408,Io.2=3.7195；因此向短路点d-2提供的短路点电流为：14=5.4408X12.5/(1.732X35)=1.1219KA；因此，短路点的短路电流为：I”=IO+I1+I2+I3+I4=12.718+0.3124+0.5624+2.488+1.1219=17.2027KAIo.2=12.718+3.2373X4/0.9/1.732X35+3.2373X8.002/1.732X35+3.0208X37.5/1.732X35+3.7195X12.5/1.732X35=12.718+0.2373+0.4273+1.8687+0.767=16.0183KA短路冲击电流为：Ich=1.52X17.2027=26.15KAich=2.55X17.2027=43.87KA短路容量为：

82S'=l.732X37X17.2027=1102.42MVA短路阻抗为：X*=1.5605/17.2027=0.09071三中央35KV侧短路电流计算结果表短路百符号系统二烧结三烧2#发电机TRT总计;.|||央35KV侧短路点d-2EX0.12275.89523.27440.72051.5978Xjs0.12270.2620.2620.27020.1997I*''Z8.149964.26034.26034.02195.4408I*8.149963.23733.23733.02083.7159S''Z(MVA)814.99620.019836.0408159.44171.89581102.393I"Z(KA)12.7180.31240.56242.4881.121917.2027I(KA)12.7180.23730.42731.86870.76716.0183ich(KA)43.86689Ich(KA)26.1481第十三节当三中央0#变代替1#变运行时，三中央35KVI段短路电流计算1运行方式：0#变带梅塞尔、1#发电机、2#发电机、二烧3200KW风机、三烧一、等值电抗图：

83二、各元件电抗值换算：将三烧、二烧和2#发电机的电抗折算到绕组中压侧，得:EY=l/2.51+1/5.644+1/0.5523+1/0.1557=0.3984+0.1772+1.8106+6.4226=8.8088C=8.8088X0.1557=1.3715X6=2.51X1.3715=3.4425X7=5.644X1.3715=7.7407X8=0.5523X1.3715=0.7575将系统、三烧、二烧和2#发电机的电抗折算到三中央35KV侧，得:EY=l/3.4425+1/7.7407+1/0.7575+1/0.12779+1/(-0.00625)=0.2905+0.1292+1.3201+7.8253-160=-150.4349C=-150.4349X(-0.00625)=0.9402X6=3.4425X0.9402=3.2366X7=7.7407X0.9402=7.2778X8=0.7575X0.9402=0.7122Xl=0.12779X0.9402=0.1201X9=1.1693+0.2454=1.4147XI0=1.7874+0.2631=2.0505

84三、简化等值电抗图：将各元件的电抗全部换算成计算电抗：系统:Xjs=0.1201三烧同步机：Xjs=3.2366X8.002/100=0.259二烧同步机:Xjs=7.2778X(3.2/0.9)/100=0.25882#发电机:Xjs=0.7122X37.5/100=0.26711#发电机:Xjs=1.4147X15/100=0.2122梅塞尔同步机:Xjs=2.0505X(10.7/0.95)/100=0.231因此等值电抗图如下：二烧_系统展电机裔鳏g黄同2臧电机梅塞尔四、短路电流计算：系统向短路点d-2提供的短路电流为：10=1.5605/0.1201=12.9933KA二烧结3200KW同步机按Xjs=0.2588查表用插值法求得：I2=4.3114,Io.2=3.2638；因此向短路点d-2提供的短路电流为11=4.3114X3.2/0.9/1.732X35=0.2529KA；1#发电机按Xjs=0.2122查表用插值法求得：I?=5.1307,10,2=3.5759；因此向短路点d-2提供的短路电流为12=5.1307X15/1.732X35=1.2696KA；三烧结同步机按1=0.259查表用插值法求得：12=4.4685,10.2=3.343；因此向短路点d-2提供的短路电流为13=4.4685义8.002/1.732X35=0.5899KA；2#发电机按时=0.2671查表用插值法求得：34.0694,I。♦2=3.0467；因此向短路点d-2提供的短路电流为14=4.0694X37.5/1.732X35=2.5174KA；梅塞尔同步机按Xjs=0.231查表用插值法求得：b=4.8306,10.2=3.523；因此向短路点d-2提供的短路点电流为：15=4.8306义(10.7/0.95)/(1.732X35)=0.8975KA因此，短路点的短路电流为：r'=10+11+12+13+14+15=12.9933+0.2529+1.2696+0.5899+2.5174+0.8975=18.5206KA

85Io.2=12.9933+3.523X10.7/0.95/1.732X35+3.5759X15/1.732X35+3.2638X3.2/0.9/1.732X35+3.343X8.002/1.732X35+3.0467X37.5/1.732X35=12.9933+0.6545+0.8848+0.1914+0.4413+1.8847=17.05KA短路冲击电流为：ICh=l.52X18.5206=28.15KAich=2.55X18.5206=47.23KA短路容量为：S'=1.732X18.5206X37=1186.87MVA短路电抗为：X*=l.5605/18.5206=0.08426三中央35KV侧短路电流计算结果表短路点符号系统:烧结2#发电机三烧1#发电机梅塞尔总计二中央35KV侧短路点d-2ZX0.12017.27780.71223.23661.41472.051Xjs0.12010.25880.26710.2590.21220.2318.326394.31144.06944.46855.13074.831I*8.326393.26383.04673.3433.57593.523SnZ(MVA)832.63916.207161.32537.80381.36157.521186.9r'Z(KA)12.99330.25292.51740.58991.26960.89818.521KKA)12.99330.19141.88470.44130.88480.65517.05ich(KA)47.228Ich(KA)28.151

86第十四节当三中央0#变代替1#变运行时，三中央35KVI段短路电流计算2运行方式：0#变带梅塞尔、1#发电机、2#发电机、二烧3200KW风机一、等值电抗图：系统同步机二、各元件电抗值换算:将二烧和2#发电机的电抗折算到绕组中压侧，得:X7=5.644+0.1557+5.644X0.1557/0.5523=7.3908X8=0.5523+0.1557+0.5523X0.1557/5.644=0.7232将系统、二烧和2#发电机的电抗折算到三中央35KV侧，得:EY=l/7.3908+1/0.7232+1/0.12779+1/(-0.00625)=0.1353+1.3827+7.8253-160=-150.6567

87C=-150.6567X(-0.00625)=0.9416X7=7.3908X0.9416=6.9592X8=0.7232X0.9416=0.681Xl=0.12779X0.9416=0.1203X9=1.1693+0.2454=1.4147XI0=1.7874+0.2631=2.0505三、简化等值电抗图：将各元件的电抗全部换算成计算电抗：系统:Xjs=0.1203二烧同步机:Xjs=6.9592X(3.2/0.9)/100=0.24742#发电机:Xjs=0.681X37.5/100=0.25541#发电机:Xjs=l.4147X15/100=0.2122梅塞尔同步机:Xjs=2.0505X(10.7/0.95)/100=0.231因此等值电抗图如下：二烧系统1#发电机若黑鬻2穗电机梅塞尔四、短路电流计算：系统向短路点d-2提供的短路电流为：10=1.5605/0.1203=12.9717KA二烧结3200KW同步机按Xjs=0.2474查表用插值法求得：I2=4.5149,Io.2-3.3664；因此向短路点d-2提供的短路电流为11=4.5149X3.2/0.9/1.732X35=0.2648KA；

881#发电机按Xjs=0.2122查表用插值法求得：h=5.1307,I。.2=3.5759；因此向短路点d-2提供的短路电流为12=5.1307X15/1.732X35=1.2696KA；2#发电机按时=0.2554查表用插值法求得：12=4.258,I02=3.1474；因此向短路点d-2提供的短路电流为13=4.258X37.5/1.732X35=2.634KA；梅塞尔同步机按Xjs=0.231查表用插值法求得：b=4.8306,Io.2=3.523；因此向短路点d-2提供的短路电流为：14=4.8306X(10.7/0.95)/(1.732X35)=0.8975KA因此，短路点的短路电流为：r'=10+11+12+13+14=12.9717+0.2648+1.2696+2.634+0.8975=18.0376KAIo.2=12.9717+3.523X10.7/0.95/1.732X35+3.5759X15/1.732X35+3.3664X3.2/0.9/1.732X35+3.1474X37.5/1.732X35=12.9717+0.6545+0.8848+0.1975+1.947=16.6555KA短路冲击电流为：Ich=l.52X18.0376=27.42KAi3=2.55X18.0376=46KA短路容量为：S'=1.732X18.0376X37=1155.92MVA短路电抗为：X*=l.5605/18.0376=0.08651

89三中央35KV侧短路电流计算结果表短路点符号系统烧结2#发电机1#发电机梅塞尔总计中央35KV侧短路点d-2EX0.12036.95920.6811.41472.0505Xjs0.12030.24740.25540.21220.231I*HZ8.312554.51494.2585.13074.8306I*8.312553.36643.14743.57593.523szMVA)831.25516,969168.881.36157.5151155.9IHZ(KA)12.97170.26482.6341.26960.897518.0376KKA)12.97170.19751.9470.884S0.654516.6555ich(KA)45.9959Ich(KA)27.4172第十五节当三中央1#变加带TRT时，三中央35KVI段短路电流计算运行方式：1#变带梅塞尔、1#发电机、TRT、二烧结1#主风机3200KW、三烧结一、系统电抗图：

90系2元二、各元件电抗值换算：将TRT和1#发电机的电抗折算到35KV侧，得:X3=1.3524+0.2454+1.3524X0.2454/1.1693=1.8816X4=l.l693+0.2454+1.1693X0.2454/1.3524=1.6269将三烧和二烧的电抗折算到绕组中压侧，得:一烧320施/风机二烧3200KW风机

91X6'=X6+X2+X6XX2/X7=2.51+0.1555+2.51X0.1555/5.644=2.7347X7'=X7+X2+X7XX2/X6=5.644+0.1555+5.644X0.1555/2.51=6.1492再将系统、二烧和三烧的电抗折算到35KV侧，得:SY=1/X1+1/X6,+1/X7,+1/X3=1/0.12949+1/2.7347+1/6,1492+1/(-0.0056)=-170.32C=-170.32X(-0.0056)=0.9538Xr=0.12949X0.9538=0.1235X7”=2.7347X0.9538=2.6084X8”=6.1492X0.9538=5.8651三、简化等值电抗图：将各电抗折算成计算电抗：系统：梅塞尔同步机：1#发电机：TRT同步机：二烧结1#主风机3200KW：三烧结同步机：根据计算电抗画出等值电路Xjs=0.1235Xjs=2.0505X10.7/0.95/100=0.231Xjs=1.6269X15/100=0.244XjS=1.8816X12.5/100=0.235Xjs=5.8651X3.2/0.9/100=0.2085Xjs=2.6084X8.002/100=0.2087

92系统三烧二烧TRT1#发电机梅塞尔四、短路电流计算：系统向短路点d-2提供的短路电流为：10=1.5605/0.1235=12.6356KA三烧结同步机按XjS=0.2087查表用插值法求得：L=5.3211,Io,2=3.759；因此向短路点d-2提供的短路电流为：11=5.3211X8.002/(1.732X35)=0.7024KA；二烧结3200KW同步机按Xjs=0.2085查表用插值法求得：b=5.3258,Io.2=3.7612；因此向短路点d-2提供的短路电流为：I2=5.3258X(3.2/0.9)/(1.732X35)=0.3124KA；TRT同步机按Xjs=0.235查表用插值法求得：b=4.629,10,2=3.3363；因此向短路点d-2提供的短路电流为13=4.629X10/0.8/1.732X35=0.9545KA；1#发电机按Xjs=0.244查表用插值法求得：L=4.4564,10.2=3.25；因此向短路点d-2提供的短路电流为14=4.4564X15/1.732X35=1.1027KA；梅塞尔同步机按Xj‘=0.231查表用插值法求得：b=4.8306,Io.2=3.523；因此向短路点d-2提供的短路电流为：I5=4.8306X(10.7/0.95)/(1.732X35)=0.8975KA因此，短路点d-2的短路电流为：I,,=IO+I1+I2+I3+I4+15=12.6356+0.7024+0.3124+0.9545+1.1027+0.8975=16.6051KA10.2=12.6356+3.759X8.002/1.732X35+3.7612X3.2/0.9/1.732X35+3.25X15/1.732X35+3.523X10.7/0.95/1.732X35+3.3363X12.5/1.732X35=12.6356+0.4962+0.2206+0.8042+0.6546+0.688=15.4992KA短路冲击电流为：Ich=1.52X16.6051=25.24KA

93ich=2.55X16.6051=42.34KA短路容量为：S=1.732X37X16.6051=1064.12MVA短路阻抗为：X*=1.5605/16.6051=0.094三中央35KV侧短路电流计算结果表短路点符号系统三烧结二烧结1#发电机梅塞尔TRT总计三中央35KV侧短路点d-2EX0.12352.60845.86511.62692.05051.8816Xjs0.12350.20870.20850.2440.2310.235I*''Z8.09725.32115.32584.45644.83064.629I*8.09723.7593.76123.253.5233.3363S''Z(MVA)809.7245.01320.019870.665457.51561.1681064.1I''Z(KA)12.6360.70240.31241.10270.89750.954516.6051I(KA)12.6360.49620.22060.80420.65460.68815.4992ich(KA)42.343Ich(KA)25.2398第十六节当三中央2#变加带1#发电机时，三中央35KVII段短路电流计算运行方式：2#变带二烧结4000KW风机、2#发电机、TRT和1#发电机一、系统电抗图：二、各元件电抗值换算:将TRT和1#发电机的电抗折算到35KV侧，得:

94TRT/1.8816(1.62691极电机X3=1.3524+0.2454+1.3524X0.2454/1.1693=1.8816X4=l.l693+0.2454+1.1693X0.2454/1.3524=1.6269将二烧和2#发电机的电抗折算到绕组中压侧，得：X7'=X7+X2+X7XX2/X8=4.519+0.1562+4.519X0.1562/0.5523=5.9533二烧4000KW岚机X8'=X8+X2+X8XX2/X7=0.5523+0.1562+0.5523X0.1562/4.519=0.72765.95330.72762雄电机二烧4000KW风机再将系统、二烧和2#发电机的电抗折算到35KV侧，得:SY=1/X1+1/X7,+1/X8,+1/X3=1/0.12979+1/5.9533+1/0.7276+1/(-0.00575)=7.7048+0.168+1.3744-173.913=-164.6658C=-164.6658X(-0.00575)=0.9468Xr=0.12979X0.9468=0.1229X7''=5.9533X0.9468=5.6366X8”=0.7276X0.9468=0.68890.1562

95三、简化等值电抗图：将各电抗换算成计算电抗：系统：Rs=0.1229二烧结同步机：Xjs=5.6366X4/0.9/100=0.25052#发电机：Xjs=0.6889X37.5/100=0.2583TRT同步机：Xjs=1.8816X12.5/100=0.23521#发电机：1.6269X15/100=0.244系统二烧2裱:电机TRT1#发电机四、短路电流计算：系统向短路点d-2提供的短路电流为：I0=1.5605/0.1229=12.6973KA二烧结4000KW同步机按Xjs=0.2505查表用插值法求得：b=4.4433KA,Io.2=3.3385KA；因此向短路点d-2提供的短路电流为11=(4.4433X4/0.9)/1.732X35=0,3258KA；2#发电机按Xjs=0.2583查表用插值法求得：12=4.2076KA,Io.2=3.1213KA；因此向短路点d-2提供的短路电流为12=4.2076X37.5/1.732X35=2.6029KA；TRT同步机按Xjs=0.2352查表用插值法求得：b=4.629,10.2=3.3363;因此向短路点d-2提供的短路电流为13=4.629X10/0.8/1.732X35=0.9545KA；1#发电机按Xj‘=0.244查表用插值法求得：b=4.4564,10.2=3.25；因此向短路点d-2提供的短路电流为I4=4.4564X15/1.732X35=1.1027KA；

96因此，短路点的短路电流为：r^IO+Il+12+13+14=12.6973+0.3258+2.6029+0.9545+1.1027=17.6832KAIo.2=12.6973+3.3385X4/0.9/1.732X35+3.1213X37.5/1.732X35+3.3363X12.5/1.732X35+3.25X15/1.732X35=12.6973+0.2448+1.9309+0.688+0.8042=16.3652KA短路冲击电流为：Ich=1.52X17.6832=26.88KA徐=2.55X17.6832=45.09KA短路容量为：S=1.732X37X17.6832=1131.21MVA短路阻抗为：X*=1.5605/17.6832=0.08825三中央35KV侧短路电流E卜算结果表短路点初七系统二烧结2#发电机TRT1#发电机息计二中央35KV侧短路点d-2EX0.12295.63660.68891.88161.6269Xjs0.12290.25040.25830.23520.244I*''Z8.13674.46144.20764.20764.4564I*8.13673.33943.12133.12133.25S''Z(MVA)813.6720.8786166.80461.168270.66541133.186r'Z(KA)12.69730.32582.60290.95451.102717.6832I(KA)12.69730.24481.93090.6880.804216.3652ich(KA)45.09216Ich(KA)26.87846第十七节梅塞尔10KV最大运行方式下短路电流计算一、系统电抗图：

97系统二、各元件电抗值换算：参照35KV短路点短路电流计算，将系统、三烧、二烧、2#发电机、TRT和1#发电机的电抗折算到35KV侧，得：X7”=3.35XI0'=1.6269Xr=0.1225X6”=3.338X8"=0.7345X9'=1.8816等值电路图如下：再将系统、三烧、二烧、2#发电机、TRT、1#发电机和梅塞尔的电抗折算到梅塞尔10KV侧，得：EY=1/X1,+1/X6,,+1/X7,,+1/X8,,+1/X9,+1/X1O,+1/X5=1/0.1225+1/3.338+1/3.35+1/0.7345+1/1.8816+1/1.6269+1/0.2631=8.1633+0.2996+0.2985+1.3615+0.5315+0.6147+3.8008=15.0699C=EYXX5=15.0699X0.2631=3.9649X1''=X1'XC=0.1225X3.9649=0.4857

98X6"'=X6''XC=3.338*3.9649=13.2348X7，,,=x7，'xC=3.35X3.9649=13.2824X8"'=X8"XC=0.7345X3.9649=2.9122X9''=X9'XC=1.8816X3.9649=7.4604XIO''=X1O'XC=1.6269X3.9649=6.4505三、简化等值电抗图：将各电抗全部换算成计算电抗：系统：Xjs=0.4857三烧结同步机：Xjs=13.2348X8.002/100=1.0593二烧结同步机：Xjs=13.2824X7.2/0.9/100=1.06262#发电机：Xjs=2.9122X37.5/100=1.0921TRT同步机：Xjs=7.4604X10/0.8/100=0.93261#发电机：Xjs=6.4505X15/100=0.9676梅塞尔同步机：Xjs=1.7874X10.7/0.95/100=0.2013四、短路电流计算：系统向短路点d4提供的短路电流为：10=5.5/0.0.4857=11.3239KA三烧结同步机：按Xjs=l.0593查表得：1=0.9996,10.2=0.9934因此向短路点提供的短路电流为：Il=0.9996X8.002/1.732X10=0.4618KA二烧结同步机:按Xjs=l.0626查表得：1=0.9973,10.2=0.9913因此向短路点提供的短路电流为：12=0.9973X7.2/0.9/1.732X10=0.4606KA2#发电机:按Xjs=1.0921查表得：1=0.9472,10.2=0.8764因此向短路点提供的短路电流为：I3=0.9472X37.5/1.732X10.5=1.9532KATRT同步机：按Xjs=0.9326查表得：1=1.1127,10.2=1.0206因此向短路点提供的短路电流为：14=1.1127X10/0.8/1.732X10=0.803KA

991#发电机：按Xjs=0.9676查表得：1=1.0714,10.2=0.9852因此向短路点提供的短路电流为：15=1.0714X15/1.732X10.5=0.8837KA梅塞尔同步机:按Xjs=0.2013查表得：1=5.4954,10.2=3.8415因此向短路点提供的短路电流为：I6=5.4954X10.7/0.95/1.732X10=3.5736KA因此，短路点d-4的短路电流为：r^IO+Il+12+13+14+15+16=11.3239+0.4618+0.4606+1.9532+0.803+0.8837+3.5736=19.4598KA10.2=11.3239+0.9934X8.002/1.732X10+0.9913X7.2/0.9/1.732X10+0.8764X37.5/1.732X10.5+1.0206X10/0.8/1.732X10+0.9852X15/1.732X10.5+3.8415X10.7/0.95/1.732X10=11.3239+0.459+0.4579+1.8072+0.7366+0.8124+2.4981=18.095IKA短路冲击电流为：Ich=1.52X19.4598=29.58KAich=2.55X19.4598=49.6225KA短路容量为：S^l.732X10.5X19.4598=353.9MVA短路电抗为：X*=5.5/19.4598=0.2826梅塞尔10KV侧短路电流计算结果表短路点符号系统三烧结二烧结2#发电机TRT1#发电机梅塞尔总计梅塞尔10KV侧短路点d-4EX0.485713.23513.2822.91227.46046.45051.7874Xjs0.48571.05931.06261.09210.93260.96760.2013I*''Z2.05890.99960.99730.94721.11271.07145.4954I*2.05890.99340.99130.87641.02060.98523.8415S''Z(MVA)205.898.39838.376535.520914.60316.07164.989353.85r'Z(KA)11.32390.46180.46061.95320.8030.88373.573619.46I(KA)11.32390.4590.45791.80720.73660.81242.498118.095ich(KA)49.623Ich(KA)29.58

100第十八节梅塞尔10KVI段短路电流计算运行方式：1#主变带三烧、二烧3200KW风机、1#发电机和梅塞尔一、系统电抗图：二、各元件电抗值换算：参照短路点d-2短路电流计算，将系统、三烧、二烧、1#发电机的电抗折算到35KV侧，得:Xr=0.1235X6''=2.6084X7''=5.8651X4'=1.4147再将系统、三烧、二烧、1#发电机和梅塞尔得电抗折算到梅塞尔10KV侧，得：LY=1/Xr+1/X6,,+1/X7,,+1/X4,+1/X5

101=1/0.1235+1/2.6084+1Z5.8651+1/1.4147+1/0.2631=8.0972+0.3834+0.1705+0.7069+3.8008=13.1588C=EYXX5=13.1588X0.2631=3.4621Xl''=0.1235X3.4621=0.4276X6,,,=2.6084X3.4621=9.0305X7"'=5.8651X3.4621=20.3056X4"=l.4147X3.4621=4.8978三、简化等值电抗图：将各电抗折算成计算电抗：系统：Xjs=0.4276梅塞尔同步机：Xjs=1.7874X10.7/0.95/100=0.20131#发电机：Xjs=4.8978X15/100=0.7347二烧结1#主风机3200KW：Xjs=20.3056X3.2/0.9/100=0.722三烧结同步机：Xjs=9.0305X8.002/100=0.7226系统三族同步机二烧告史图1”发电机悔重尔四、短路电流计算：系统向短路点d-4提供的短路电流为：I0=5.5/0.4276=12.8625KA三烧结同步机：按Xjs=0.7226查表得：1=1.4861,10.2=1.4112因此向短路点提供的短路电流为：11=1.4861X8.002/1.732X10=0.6866KA二烧结同步机：按Xjs=0.722查表得：1=1.4874,10.2=1.4123因此向短路点提供的短路电流为：I2=1.4874X3.2/0.9/1.732X10=0.3053KA1#发电机:按Xjs=0.7347查表得：1=1.4212,10.2=1.2784因此向短路点提供的短路电流为：I3=1.4212X15/1.732X10.5=1.1722KA梅塞尔同步机：按Xjs=0.2013查表得：1=5.4954,10.2=3.8415因此向短路点提供的短路电流为：I4=5.4954X10.7/0.95/1.732X10=3.5736KA因此，短路点d-4的短路电流为：

102I''=IO+I1+I2+I3+I4=12.8625+0.6866+0.3053+1.1722+3.5736=18.6002KA10.2=12.8625+1.4112X8.002/1.732X10+1.4123X3.2/0.9/1.732X10+1.2784X15/1.732X10.5+3.8415X10.7/0.95/1.732X10=12.8625+0.652+0.2899+1.0544+2.4981=17.3569KA短路冲击电流为：Ich=1.52X18.6002=28.27KAich=2.55X18.6002=47.43KA短路容量为：S=1.732X10.5X18.6002=338.26MVA短路阻抗为：X*=5.5/l8.6002=0.2957注明：梅塞尔iokvn段短路电流比i段短路电流小，因此只计算I段短路电流。梅塞尔10KV侧短路电流计算结果表短路点符弓系统三烧结二烧结1#发电机梅塞尔总计梅塞尔10KV侧短路点d-4XX0.42769.030520.3064.89781.7874Xjs0.42760.72260.7220.73470.2013I*''Z2.33861.48611.48741.42125.4954I*2.33861.41121.41231.27843.8415S''Z(MVA)233.8612.48655.552221.317664.9895338.206r'Z(KA)12.86250.68660.30531.17223.573618.6002I(KA)12.86250.6520.28991.05442.498117.3569ich(KA)47.43Ich(KA)28.27第十九节当三中央0#变代替1#变运行时，梅塞尔10KVI短路电流计算1运行方式：0#变带梅塞尔、1#发电机、2#发电机、二烧

1033200KW风机、三烧一、等值电抗图：系统二、各元件电抗值换算:将三烧、二烧和2#发电机的电抗折算到绕组中压侧，得:LY=l/2.51+1/5.644+1/0.5523+1/0.1557=0.3984+0.1772+1.8106+6.4226=8.8088C=8.8088X0.1557=1.3715X6=2.51X1.3715=3.4425X7=5.644X1.3715=7.7407X8=0.5523X1.3715=0.7575将系统、三烧、二烧和2#发电机的电抗折算到三中央35KV侧，得:EY=l/3.4425+1/7.7407+1/0.7575+1/0.12779+1/(-0.00625)

104=0.2905+0.1292+1.3201+7.8253-160=-150.4349C=-150.4349X(-0.00625)=0.9402X6=3.4425X0.9402=3.2366X7=7.7407X0.9402=7.2778X8=0.7575X0.9402=0.7122Xl=0.12779X0.9402=0.1201XI0=1.7874+0.2631=2.0505再将系统、三烧、二烧、2#发电机和1#发电机的电抗折算到梅塞尔10KV侧，得:£Y=l/0.1201+1/3.2366+1/7.2778+1/0.7122+1/1.4147+1/0.2631=8.3264+0.309+0.1374+1.4041+0.7069+3.8008=14.6846C=14.6846X0.2631=3.8635X6=3.2366X3.8635=12.5046X7=7.2778X3.8635=28.1178X8=0.7122X3.8635=2.7516X1=O.1201X3.8635=0.464X9-1.4147X3.8635=5.4657三、简化等值电抗图：

105将各元件的电抗全部换算成计算电抗：系统:Xjs=0.464三烧同步机:Xjs=12.5046X8.002/100=1.0006二烧同步机：Xjs=28.1178X(3.2/0.9)/100=0.99972#发电机:Xjs=2.7516X37.5/100=1.03191#发电机：Xjs=5.4657X15/100=0.8199梅塞尔同步机：Xjs-1.7874X(10.7/0.95)/100=0.2013因此等值电抗图如下：二烧系统1线电机商黑案赢同2穗电机梅塞尔四、短路电流计算：系统向短路点d-4提供的短路电流为：10=5.5/0.464=11.8534KA二烧结3200KW同步机按Xjs=0.9997查表用插值法求得：12=1.0613,Io.2=1.0483；因此向短路点d-4提供的短路电流为11=1.0613义3.2/0.9/1.732X10=0.2179KA；1#发电机按儿=0.8199查表用插值法求得：51.2696,10,2=1.1531；因此向短路点d-4提供的短路电流为12=1.2696X15/1.732X10.5=1.0472KA；三烧结同步机按口=1.0006查表用插值法求得：31.0604,51.0474；因此向短路点d-4提供的短路电流为13=1.0604X8.002/1.732X10=0.4899KA；2#发电机按Xjs=l.0319查表用插值法求得：I2=1.0031,Io.2=O.9259；因此向短路点d-4提供的短路电流为14=1.0031X37.5/1.732X10.5=2.0684KA；梅塞尔同步机按Xjs=0.2013查表用插值法求得：【2=54954,10.2=3.8415；因此向短路点d-4提供的短路电流为：15=5.49的X(10.7/0.95)/(1.732X10)=3.5736KA因此，短路点的短路电流为：=10+11+12+13+14+15=11.8534+0.2179+1.0472+0.4899+2.0684+3.5736=19.2504KAIo.2=11.8534+3.8415X10.7/0.95/1.732X10+1.1531X15/1.732X10.5+1.0483X

1063.2/0.9/1.732X10+1.0474X8.002/1.732X10+0.9259X37.5/1.732X10.5=11.8534+2.4981+0.9511+0.2152+0.4839+1.9092=17.9109KA短路冲击电流为：1dl=1.52X19.2504=29.26KAich=2.55X19.2504=49.09KA短路容量为：S'=1.732X19.2504X10.5=350.08MVA短路电抗为：X*=5.5/19.2504=0.2857梅塞尔10KV侧短路电流计算结果表短路点符弓系统二烧结2#发电机三烧1#发电机梅塞尔总计梅塞尔10KV侧短路点d-4LX0.46428.1182.751612.5055.46571.7874Xjs0.4640.99971.03191.00060.81990.2013I*HZ2.155171.06131.00311.06041.26965.4954I*2.155171.04830.92591.04741.15313.8415SnZ(MVA)215.5173.962737.6168.909319.04464.989350.039F'Z(KA)11.85340.21792.06840.48991.04723.573619.2504KKA)11.85340.21521.90920.48390.95112.498117.9109ich(KA)49.0885Ich(KA)29.2606

107第二十节当三中央0#变代替1#变运行时，梅塞尔10KVI短路电流计算2运行方式：0#变带梅塞尔、1#发电机、2#发电机、二烧3200KW风机一、等值电抗图:3200KW同步机二、各元件电抗值换算：将二烧和2#发电机的电抗折算到绕组中压侧，得:X7=5.644+0.1557+5.644X0.1557/0.5523=7.3908X8=0.5523+0.1557+0.5523X0.1557/5.644=0.7232

108将系统、二烧和2#发电机的电抗折算到三中央35KV侧，得:EY=l/7.3908+1/0.7232+1/0.12779+1/(-0.00625)=0.1353+1.3827+7.8253-160=-150.6567C=-150.6567X(-0.00625)=0.9416X7=7.3908X0.9416=6.9592X8=0.7232X0.9416=0.681Xl=0.12779X0.9416=0.1203X9=1.1693+0.2454=1.4147再将系统、二烧、2#发电机和1#发电机的电抗折算到梅塞尔1OKV侧，得:系统二髭翳2峨电机1#发电机EY=l/0.1203+1/6.9592+1/0.681+1/1.4147+1/0.2631=8.3126+0.1437+1.4684+0.7069+3.8008=14.4324C=14.4324X0.2631=3.7972X7=6.9592X3.7972=26.4255X8=0.681X3.7972=2.5859X1=O.1203X3.7972=0.4568

109X9-1.4147X3.7972=5.3719三、简化等值电抗图：将各元件的电抗全部换算成计算电抗：系统：Xjs=0.4568二烧同步机:Xjs=26.4255X(3.2/0.9)/100=0.93962#发电机:Xjs=2.5859X37.5/100=0.96971#发电机:Xjs=5.3719X15/100=0.8058梅塞尔同步机:Xjs=1.7874X(10.7/0.95)/100=0.2013因此等值电抗图如下：二烧系统1#发电机商:貌2球电机梅塞尔四、短路电流计算：系统向短路点d-4提供的短路电流为：10=5.5/0.4568=12.0403KA二烧结3200KW同步机按0=0.9396查表用插值法求得：I2=l.1313,Io.2=l.1106；因此向短路点d-4提供的短路电流为11=1.1313X3.2/0.9/1.732X10=0.2322KA；1#发电机按Xjs=0.8058查表用插值法求得：I2=l.2918,I02=l.1715；因此向短路点d-4提供的短路电流为12=1.2918X15/1.732X10.5=1.0655KA；2#发电机按XJs=0.9697查表用插值法求得：I2=l.0689,I02=0.9831；因此向短路点d-4提供的短路电流为13=1.0689X37.5/1.732X10.5=2.2041KA；梅塞尔同步机按Xj"=O.2O13查表用插值法求得：12=5.4954,Io.2=3.8415；因此向短路点d-4提供的短路电流为：14=5.4954义(10.7/0.95)/(1.732X10)=3.5736KA；因此，短路点的短路电流为：=10+11+12+13+14=12.0403+0.2322+1.0655+2.2041+3.5736-19.1157KAIo.2=12.0403+3.8415X10.7/0.95/1.732X10+1.1715X15/1.732X10.5+1.1106X3.2/0.9/1.732X10+0.9831X37.5/1.732X10.5

110=12.0403+2.4981+0.9663+0.228+2.0272=17.7599KA短路冲击电流为：Ich=l.52X19.1157=29.06KAich=2.55X19.1157=48.75KA短路容量为：S'=1.732X19.U57X10.5=347.64MVA短路电抗为：X*=5.5/19.1157=0.2877梅塞尔10KV侧短路电流计算结果表短路卢符号系统二烧结2#发电机1#发电机梅塞尔总计梅塞尔1OKV侧短路点d-4EX0.456826.42552.58591.41475.3719Xjs0.45680.93960.96970.21220.8058I*”z2.189141.13131.06891.29185.4954I*2.189141.11060.98311.17153.8415SHZ(MVA)218.9144.2227940.083819.37764.989347.587IMZ(KA)12.04030.23222.20411.06553.573619.1157KKA)12.04030.2282.02720.96632.498117.7599ich(KA)48.745Ich(KA)29.0558第二H^一节当三中央1#变加带TRT时，梅塞尔10KVI段短路电流计算

111运行方式：1#变带梅塞尔、1#发电机、TRT、二烧结1#主风机3200KW、三烧结一、系统电抗图:二、各元件电抗值换算:将TRT和1#发电机的电抗折算到35KV侧，得:TRT/1.8816/1.6269-I1极电机X3=1.3524+0.2454+1.3524X0.2454/1.1693=1.8816X4=l.l693+0.2454+1.1693X0.2454/1.3524=1.6269将三烧和二烧的电抗折算到绕组中压侧，得：

112二烧320必风机二烧320诵I风机X6'=X6+X2+X6XX2/X7=2.51+0.1555+2.51X0.1555/5.644=2.7347X7'=X7+X2+X7XX2/X6=5.644+0.1555+5.644X0.1555/2.51=6.1492再将系统、二烧和三烧的电抗折算到35KV侧，得：LY=1/X1+1/X6,+1/X7,+1/X3=1/0.12949+1/2.7347+1/6.1492+1/(-0.0056)=-170.32C=-170.32X(-0.0056)=0.9538Xr=0.12949X0.9538=0.1235X7”=2.7347X0.9538=2.6084X8''=6.1492X0.9538=5.8651最后将系统、二烧、三烧、TRT和1#发电机的电抗折算到梅塞尔10KV侧,得：£Y=1/X1,+l/X6,,+l/X7,,+l/X9,+l/X10,+l/Xl1=1/0.1235+1/2.6084+1/5.8651+1/1.8816+1/1.6269+1/0.2631=8.0972+0.3834+0.1705+0.5315+0.6147+3.8008=13.5981C=13.5981X0.2631=3.5777XI”=0.1235X3.5777=0.4418X6"'=2.6084X3.5777=9.3321X7"'=5.8651X3.5777=20.9836X9''=l.8816X3.5777=6.7318

113X10"=l.6269X3.5777=5.8206三、简化等值电抗图：将各电抗折算成计算电抗：系统：Xjs=0.4418梅塞尔同步机：Xjs=1.7874X10.7/0.95/100=0.20131#发电机：Xjs=5.8206X15/100=0.8731TRT同步机：Xjs=6.7318X12.5/100=0.8415二烧结1#主风机3200KW：Xjs=20.9836X3.2/0.9/100=0.7461三烧结同步机：Xjs=9.3321X8.002/100=0.7468根据计算电抗画出等值电路四、短路电流计算:系统向短路点d-4提供的短路电流为：I0=5.5/0.4418=12.4491KA三烧结同步机按Xj‘=0.7468查表用插值法求得：b=L4348,Io.2=L3686；因此向短路点d-4提供的短路电流为：11=1.4348X8.002/(1.732X10)=0.6629KA；二烧结3200KW同步机按Xjs=0.7461查表用插值法求得：b=l4363,10.2=1.3699；因此向短路点d-4提供的短路电流为：12=1.4363X(3.2/0.9)/(1.732X10)=0.2949KA；

114TRT同步机按Xjs=0.8415查表用插值法求得：b=L2354,Io.2=L125；因此向短路点d-4提供的短路电流为13=1.2354X10/0.8/(1.732X10)=0.8916KA；1#发电机按Xjs=0.8731查表用插值法求得：12=1.1901,10.2=1.0867；因此向短路点d~4提供的短路电流为14=1.1901X15/(1.732X10.5)=0.9816KA；梅塞尔同步机按Xjs=0.2013查表用插值法求得：L=5.4954,Io.2=3.8415；因此向短路点(M提供的短路电流为：15=4.8306X(10.7/0.95)/(1.732X10)=3.5736KA因此，短路点d-4的短路电流为：1,,=10+11+12+13+14+15=12.4491+0.6629+0.2949+0.8916+0.9816+3.5736=18.8537KAIo.2=12.4491+1.3686X8.002/1.732X10+1.3699X3.2/0.9/1.732X10+1.0867X15/1.732X10.5+3.8415X10.7/0.95/1.732X10+1.125X12.5/1.732X10=12.4491+0.6323+0.2812+0.0.8963+2.4981+0.8119=17.5689KA短路冲击电流为：Ich=1.52X18.8537=28.66KAich=2.55X18.8537=48.08KA短路容量为：S=1.732X10.5X18.8537=342.87MVA短路阻抗为：X*=5.5/l8.8537=0.2917梅塞尔10KV侧短路电》依计算结果表短路点符号系统三烧结二烧结1#发电机TRT梅塞尔总计梅塞尔10KV侧短路EX0.44189.332120.9845.82066.73181.7874

115点0.7460.7460.8410.201Xjs0.4418810.8731532.26341.4341.4361.2355.495I*"Z7831.1901442.26341.3681.3693.841I*7691.08671.1255226.3412.055.36316.2164.98342.82S"Z(MVA)75117.85159112.4490.6620.2940.8913.57318.853F'Z(KA)1990.981666712.4490.6320.2812.49817.568i（ka）1320.896310.8119948.076ich(KA)928.657Ich(KA)6第二十二节三中央最小运行方式下短路电流计算最小运行方式为：2#主变带负荷（不包括同步机和发电机），系统阻抗为:0.0020l+j0.0943,本计算以电抗为主。一、最小运行方式的系统图为：系统二、系统等值电抗图:

116系统三中央二中央梅塞尔以上参数参照最大运行方式下的短路电流计算。三、短路电流计算：㈠当三中央10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-1的总电抗标幺值为:£X=X1+X2=0.2042+0.1562=0.3604基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：Imin=5.5/0.3604=15.2608KAIc=1.52X15.2608=23.2KAic=2.55X15.2608=38.92KA短路容量为：S=1.732X10.5X15.2608=277.53MVA㈡当三中央35KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-2的总电抗标幺值为:

117£X=Xl+X3=0.2042+(-0.00575)=0.19845基准电流为：Ijz=100/1.732X37=1.5605KA所以短路电流为：Imin=l.5605/0.19845=7.8634KA-O.00575s/,d-235KVIc=1.52X7.8634=11.95KAic=2.55X7.8634=20.05KA短路容量为：S=1.732X37X7.8634=503.92MVA㈢当梅塞尔10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点dd的总电抗标幺值为:£X=Xl+X3+X5=0.2042+(-0.00575)+0.2631=0.46155基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：Imin=5.5/0.46155=11.9164KAIc=1.52X11.9164=18.11KAic=2.55X11.9164=30.39KA短路容量为：S,=1.732X10.5X11.9164=216.71MVA

118第四章三中央远景短路电流计算第一节三中央最大运行方式下10KV侧短路电流计算一、最大运行方式系统图：

119电缆电抗标幺值三中央35KV送五高炉10KV母线：X=0.0114五高炉10KV母线配出：X=0.0117三中央35KV送焦烧变10KV母线：X=0.0114焦烧变10KV母线配出：X=0.0114根据系统图画出系统的电抗图：001989三诜二烧2次电机TRT】■发电机悟塞尔五高炉焦烧交二、各元件电抗值换算：参照三中央10KV短路点d-1短路电流计算，先将TRT、1#发电机、梅塞尔、五高炉和焦烧变的电抗折算到35KV侧，得：X10'=X10+X4+X10XX4/X11=1.3524+0.2454+1.3524X0.2454/1.1693=1.8816

120X11'=X11+X4+X11XX4/X10=1.1693+0.2454+1.1693X0.2454/1.3524=1.6269X5=2.0505X6=0.6831X14=1.7031再将TRT、1#发电机、梅塞尔、五高炉和焦烧变的电抗折算到绕组中压侧，得：SY=l/X3+l/X10,+l/Xir+l/X5+l/X6+l/X14=1/-0.0056+1/1.8816+1/1.6269+1/2.0505+1/0.6831+1/1.7031=-178.57+0.53+0.61+0.49+1.4639+0.5872=-174.889C=-0.0056X(-174.889)=0.9794X10,,=0.9794X1.8816=1.8428Xll,,=0.9794X1.6269=1.5934X5'=0.9794X2.0505=2.008X6'=0.9794X0.6831=0.669X14,=0.9794X1.7031=1.668将系统、TRT、1#发电机、梅塞尔、五高炉和焦烧变的电抗折算到三中央10KV侧,得:

121SY=l/X2+l/Xl+l/X10',+l/Xir,+l/X5,+l/X6,+l/X14,=1/0.1555+1/0.12949+1/1.8428+1/1.5934+1/2.008+1/0.669+1/1.668=6.4308+7.7226+0.5427+0.6276+0.498+1.4948+0.5995=17.916C=0.1555X17.916=2.786Xr=2.786X0.12949=0.3608X10,J,=2.786X1.8428=5.134XI1,,,=2.786X1.5934=4.4392X5”=2.786X2.008=5.5943X6,,=2.786X0.669=1.8638X14,,=2.786X1.668=4.647三、简化等值电抗图：将各电抗全部换算成计算电抗：系统：Xjs=0.3608TRT同步机：Xjs=5.134X12.5/100=0.64261#发电机：Xjs=4.4392X15/100=0.6418梅塞尔同步机：Xjs=5.5943X10.7/0.95/100=0.6301五高炉同步机：Xjs=1.8638X40/100=0.7455焦烧变同步机：Xjs=4.647X12.6/0.9/100=0.6506三烧同步机：Xjs=2.51X8.002/100=0,201二烧同步机：Xjs=2.519X7.2/0.9/100=0.202

1222#发电机：Xjs=0.5523X37.5/100=0.207本班TRT1#发电机梅塞尔五高炉焦烧变10,3608Jo64260.64180,63010.74550.6506/(I/j//\0,201*140.202/0.207「rr三烧二烧2拔电机四、短路电流计算：系统：10=5.5/0.3608=15.2439KA；TRT同步机：按Xjs=0.6426,查表用插值法求得：1=1.6307,10.2=1.4472；因此提供给短路点的短路电流为：Il=1.6307X12.5/10X1.732=1.1769KA1#发电机：Rs=0.6418,查表用插值法求得：1=1.6326,10.2=1.4487；因此提供给短路点的短路电流为：I2=1.6326X15/10.5X1.732=1.3466KA梅塞尔同步机：Xjs=0.6301,查表用插值法求得：1=1.7153,10.2=1,5958；因此提供给短路点的短路电流为：I3=1.7153X10.7/0.95/10X1.732=1.1155KA五高炉同步机：Xjs=0.7455,查表用插值法求得：1=1.4375,10.2=1.3709；因此提供给短路点的短路电流为：14=1.4375X40/10X1.732=3.3199KA焦烧变同步机：Xjs=0.6506,查表用插值法求得：1=1.6565,10.2=1.5488；因此提供给短路点的短路电流为：I5=1.6565X12.6/0.9/10X1.732=1.339KA三烧同步机:Xjs=0.201,查表用插值法求得：b=5.526,Io.2=3.856；因此提供给短路点的短路电流为：16=5.526义8.002/10*1.732=2.5531KA二烧同步机：Xjs=0.202,查表用插值法求得：L=5.4789,Io.2=3.8337；因此提供给短路点的短路电流为：17=5.4789X7.2/0.9/10X1.732=2.5307KA2#发电机：Xjs=0.207,查表用插值法求得：1=5.2591,10.2=3.6352；因此提供给短路点的短路电流为：18=5.2591X37.5/10.5X1.732=10.8444KA因此，短路点d-1的短路电流为：r,=I0+11+12+13+14+15+16+17+18=15.2439+1.1769+1.3466+1.1155+3.3199+1.339+2.5531+1.131+2.5307+10.8444=39.47KA10.2=12.2439+1.4472X12.5/1OX1.732+1.4487X15/10.5X1.732+1.5958X10.7/0.95/10X1.732+1.3709X40/10X1.732+1.5488X12.6/0.9/10X1.732+3.856X8.002/10X1.732+3.8337X7.2/0,9/10X1.732+3.6352X37.5/10.5X1,732=15.2439+1.0445+1.1949+1.0377+3.1661+1.2519+1.7815+1.7708+7.4959

123=33.9872KA冲击电流为：Ich=1.52XI”=l.52X39.47=59.99KAich=2.55XI”=2.55X39.47=100.65KA短路容量为：S'=1.732X10.5X39.47=717.8MVA短路电抗为：X*=5.5/39.47=0.1393三中央10KV侧短路电流计算结果表短路点符号系统烧结烧结2#发电机TRT1#发电机梅塞尔五高炉焦烧变总计0.362.52.55.15.51.864.6EX08I190.5523344.439294338470.360.2(1.20.60.60.740.6Xjs0801020.2(174260.6418301555062.775.55.41.61.71.431.6I*”Z162267895.25913071.6326153755652.773.83.81.41.51.371.5—■I*162563373.63524721.448795809488中央S"Z(MV277.46.46.197.2121.20.60.324.717.10KV侧A)162431023640324.489286757351738短路点FZ(KA15.22.52.510.8441.11.13.311.339.4d-lj43953130747691.34661559939715.21.71.71.01.03.16L233.9KKA)4398157087.49594451.19493776151987210().ich(KA)65Ich(KA59.9)9

124第二节三中央10KVI段短路电流计算运行方式：1#主变带三烧、二烧3200KW风机、1#发电机、梅塞尔和焦烧变一、系统电抗图：二、各元件电抗值换算:将1#发电机、梅塞尔和焦烧变的电抗折算到主变中压侧，得:LY=1/X11+1/X12+1/X13+1/X3=1/1.4147+1/2.0505+1/1.7031+1/-0.0056=0.7069+0.4877+0.5872-178.5714=-176.7896C=-0.0056X(-176.7896)=0.99

125Xll'=1.4147X0.99=1.4006XI2'=2.0505X0.99=2.03X13*=1.703IX0.99=1.6861再将系统、1#发电机、梅塞尔和焦烧变的电抗折算到三中央10KV侧，得:1#发电机海塞尔焦烧变系统EY=1/X1+1/XH,+1/X12,+1/X13,+1/X2=1/0.12949+1/1.4006+1/2.03+1/1.6861+1/0.1555=7.7226+0.714+0.4926+0.5931+6.4309=15.9532C=0.1555X15.9532=2.4807Xr=0.12949X2.4807=0.3212XI15,=1.4006X2.4807=3.4745X12,,=2.03X2.4807=5.0358X13”=1.6861X2.4807=4.1827而三烧和二烧的电抗折算到10KV侧的电抗为：X7=2.51X8=5.644三、简化等值电抗图：将各电抗全部换算成计算电抗：系统:Xjs=0.3212三烧同步机：Xjs=2.51X8.002/100=0.201二烧同步机：Xjs=5.644X3.2/0.9/100=0.20071#发电机:Xjs=3.4745X15/100=0.5212梅塞尔同步机：Xjs=5.0358X10.7/0.95/100=0.5672焦烧变同步机:Xjs=4.1827X(12.6/0.9)/100=0.5856二烧系统^同粼北底电机梅塞尔同步机焦烧变同步机

126四、短路电流计算：系统向短路点d-1提供的短路电流为：I0=5.5/0.3212=17.1233KA三烧结同步机按Xjs=0.201查表用插值法求得：1=5.5048,102=3.846:因此提供给短路点的短路电流为：11=5.5048义8.002/1.732X10=2.5432KA二烧结3200KW同步机按Xjs=0.2007查表用插值法求得：1=5.5095,10.2=3.8482；因此提供给短路点的短路电流为：12=5.5095义3.2/0.9/1.732X10=1.131KA1#发电机按Xjs=0.5212查表用插值法求得：1=2.027,M.2=L7502；因此提供给短路点的短路电流为：I3=2.027X15/1.732X10.5=1.6719KA梅塞尔同步机按Xjs=0.5672查表用插值法求得：1=1.9135,10,2=1.7503；因此提供给短路点的短路电流为：I4=1.9135X10.7/0.95/1.732X10=1,2443KA焦烧变同步机按Xjs=0.5856查表用插值法求得：1=1.851,Io.2=L7O24；因此提供给短路点的短路电流为：15=1.851X12.6/0.9/1.732X10=1.4962KA因此，短路点d-1的短路电流为：r=10+11+12+13+14+15=17.1233+2.5432+1.131+1.6719+1.2443+1.4962=25.2099KA10.2=17.1233+3.846X8.002/1.732X10+3.8482X3.2/0.9/1.732X10+1.7502X15/1.732X10.5+1.7503X10.7/0.95/1.732X10+1.7024X12.6/0.9/1.732X10=17.1233+1.7769+0.79+1.4436+1.1382+3.9316+1.3761=23.648IKA短路冲击电流为：Ich=1.52X25.2099=38.32KAich=2.55X25.2099=64.29KA短路容量为：

127S=1.732X10.5X25.2099=458.47MVA短路电抗为：X*=5.5/25.2099=0.2182三中央10KV侧短路电流计算结果表短路点符号系统三烧结二烧结1#发电机梅塞尔焦烧变总计二中央10KV侧短路点d-1zx0.32122.515.6443.47455.03584.1827Xjs0.32120.2010.20070.52120.56720.5856I*WZ3.113335.5265.50952.0271.91351.851I*3.113333.8563.84821.75021.75031.7024S"Z(MVA)311.33346.25120.56830.40522.628827.2099458.395r'Z(KA)17.12332.54321.1311.67191.24431.496225.2099I(KA)17.12331.77690.791.44361.13821.376123.6481ich(KA)64.2852Ich(KA)38.319第三节三中央lOKvn段短路电流计算运行方式：2#主变带二烧4000KW风机、2#发电机、TRT、五高炉一、系统电抗图：系统4。。藕机2碳电机TRT五高炉

128二、各元件电抗值换算：将TRT和五高炉的电抗折算到主变的中压侧，如图得：X14'=X14+X3+X14XX3/X10=0.6831-0.00575+0.6831X(-0.00575)/1.5978=0.6749TRT五高炉X10,=X10+X3+X10XX3/X14=l.5978-0.00575+1.5978X(-0.00575)/0.6831=1.5786TRT/1.5978-0.00575(0.6831—9——1~S一五高炉再将系统、TRT和五高炉的电抗折算到三中央10KV侧，得:EY=1/X1+1/X1O,+1/X14,+1/X2=1/0.12979+1/1.5786+1/0.6749+1/0.1562=7.7048+0.6335+1.4817+6.402=16.222C=X2XSY=0.1562X16.222=2.5339Xr=XlXC=0.12979X2.5339=0.3289X10”=X10'XC=1,5786X2.5339=4X14''=X14'XC=0.6749X2.5339=1.7101X8=4.519X9=0.5523三、简化等值电抗图:将各电抗换算成计算电抗：系统：Xjs=0.3289二烧4000KW同步机:Xjs=(4.519X4/0.9)/100=0.2008

1292#发电机：Xjs=0.5523X37.5/100=0.207TRT同步机：Xjs=4X(10/0.8)/100=0.5五高炉同步机：Xjs=1.7101X40/100=0.684系统二蹴髀2班电机TRT五高炉d-1四、短路电流计算：系统向短路点d-1提供的短路电流为：10=5.5/0.3289=16.7224KA二烧结4000KW同步机按Xjs=0.2008查表用插值法求得：1=5.5094,[0.2=3.848；因此提供给短路点的短路电流为：Il=5.5094X4/0.9/1.732X10=1.4138KA2#发电机按Xjs=0.207查表用插值法求得：1=5.2591,Io.2=3.6352；因此提供给短路点的短路电流为：12=5.2591X37.5/1.732X10.5=10.8444KATRT同步机按Xjs=0.5查表用插值法求得：1=2.111,Io.2=1.813；因此提供给短路点的短路电流为：13=2.111X10/0.8/1.732X10=1.5235KA；五高炉同步机按Xj‘=0.684查表用插值法求得：1=1.5737,Io.2=L4827；因此提供给短路点的短路电流为：I4=1.5737X40/1.732X10=3.6344KA因此短路点d-1的短路电流为：F'=IO+I1+I2+I3+I4=16.7224+1.4138+10.8444+1.5235+1.272=34.1385KA10.2=16.7224+(3.848X4/0.9)/1.732X10+3.6352X37.5/1.732X10.5+1.813X10/0.8/1.732X10+1.4827X40/1.732X10=16.7224+0.9874+7.4959+1.3085+3.4242=29.9384KA短路冲击电流：Ich=1.52XF'=l.52X34.1385=51.89KAich=2.55XI,,=2.55X34.1385=87.05KA短路容量为：S'=1.732X10.5X34.1385=620.84MVA短路电抗为：

130X*=5.5/34.1385=0.1611三中央10KV侧短路电流计算结果表短路点符号系统二烧结2#发电机TRT五高炉总计三中央10KV侧短路点d-1XX0.32894.5190.552341.7101Xjs0.32890.20080.2070.50.684I*''Z3.040445.50945.25912.Ill1.57371*3.040443.8483.63521.8131.4827S''Z(MVA)304.04425.7114197.21627.70666.0952620.773r'Z(KA)16.72241.413810.84441.52353.634434.1385I(KA)16.72240.98747.49591.30853.424229.9384ich(KA)87.0532Ich(KA)51.8905第四节三中央最大运行方式下35KV侧短路电流计算一、系统电抗图：

131系统二、各元件电抗值换算：将三烧、二烧和2#发电机的电抗折算到绕组中压侧，得:XY=1/X2+1/X6+1/X7+1/X8=1/0.1555+1/2.51+1/2.519+1/0.5523=6.4309+0.3984+0.397+1.8106=9.0369C=X2XXY=0.1555X9.0369=1.4052X6'=X6XC=2.51X1.4052=3.5271X7'=X7XC=2.519X1.4052=3.5397X8'=X8XC=0.5523X1.4052=0.7761将TRT和1#发电机的电抗折算到短路点，得:X9'=X9+X4+X9XX4/X10=1.3524+0.2454+1.3524X0.2454/1.1693=1.8816

132X1O'=X10+X4+X10XX4/X9=1.1693+0.2454+1.1693X0.2454/1.3524=1.6269TRT/1.8816’1.6269—犍尔将系统、三烧、二烧和2#发电机的电抗折算到短路点，得:LY=1/X1+1/X3+1/X6,+1/X7,+1/X8,=1/0.12949+1/-0.0056+1/3.5271+1/3.5397+1/0.7761=-169C=X3XSY=-0.0056X(-169)=0.9464X1'=X1XC=0.12949X0.9464=0.1225X6"=X6'XC=3.5271X0.9464=3.338X7”=X7'XC=3.5397X0.9464=3.35X8''=X8'XC=0.7761X0.9464=0.7345三烧二烧2■电机系统三、简化等值电抗图：将各电抗值换算成计算电抗：系统：Xjs=0.1225三烧结同步机：Xjs=3.338X8.002/100=0.2671二烧结同步机：Xjs=3.35X7.2/0.9/100=0.2682#发电机：Xjs=0.7345X37.5/100=0.2754TRT同步机：Xjs=l.8816X10/0.8/100=0.23521#发电机：Xjs=1.6269X15/100=0.244

133梅塞尔同步机：Xjs=2.0505X10.7/0.95/100=0.231五高炉同步机：Xjs=0.6831X40/100=0.2732焦烧变同步机：Xjs=1.703IX12.6/0.9/100=0.2384系统三烧二烧2所电机TRT1#发电机梅塞尔五高炉焦烧变四、短路电流计算：基准电流为：Ijz=100/1.732X37=1.5605KA系统向短路点d-2提供的短路电流为：I0=1.5605/0.1225=12.7384KA三烧结同步机：按Xjs=0.2671查表得：1=4.1846,10.2=3.1973因此向短路点提供的短路电流为：11=4.1846X8.002/1.732X35=0.5524KA二烧结同步机:按Xjs=0.268查表得：1=4.1712,10.2=3.1902因此向短路点提供的短路电流为：12=4.1712X7.2/0.9/1.732X35=0.5505KA2#发电机：按Xjs=0.2754查表得：1=3.9485,10.2=2.9808因此向短路点提供的短路电流为：13=3.9485X37.5/1.732X35=2.4426KATRT同步机：按Xjs=0.2352查表得：1=4.629,10.2=3.3363因此向短路点提供的短路电流为：14=4.629X10/0.8/1.732X35=0.9545KA1#发电机：按Xjs=0.244查表得：1=4.4564,10.2=3.25因此向短路点提供的短路电流为：15=4.4564X15/1.732X35=1.1027KA梅塞尔同步机：按Xjs=0.231查表得：1=4.8306,10.2=3.523因此向短路点提供的短路电流为：I6=4.8306X10.7/0.95/1.732X35=0.8975KA五高炉同步机：按Xjs=0.2732查表得：1=4.094,10.2=3.1494因此向短路点提供的短路电流为：17=4.094X40/1.732X35=2.7014KA焦烧变同步机：按Xjs=0.2384查表得：1=4.6796,10.2=3.449因此向短路点提供的短路电流为：I8=4.6796X12.6/0,9/1.732X35=1.0807KA因此，短路点d-2的短路电流为：r^IO+11+I2+I3+I4+I5+I6+17+18

134=12.7384+0.5524+0.5505+2.4426+0.9545+1.1027+0.8975+2.7014+1.0807=23.0207KA10.2=12.7384+3.1973X8.002/1.732X35+3.1902X7.2/0.9/1.732X35+2.9808X37.5/1.732X35+3.3363X10/0.8/1.732X35+3.25X15/1.732X35+3.523X10.7/0.95/1.732X35+3.1494X40/1.732X35+3.449X12.6/0.9/1.732X35=12.7384+0.4221+0.421+1.8439+0.688+0.8042+0.6546+2.0781+0.7965=20.4468KA短路冲击电流为：Ich=1.52X23.0207=34.99KAich=2.55X23.0207=58.7KA短路容量为：S,=1.732X37X23.0207=1475.26MVA短路阻抗为：X*=l.5605/23.0207=0.0678三中央35KV侧短路电流计算结果表短路点符号系统三烧结二烧结2#发电机TRT1#发电机梅塞尔五高炉焦烧变总计三中央35KV侧短路点d-2EX0.12253.3383.350.73451.88161.62692.05050.68311.7031Xjs0.12250.26710.2680.27540.23520.2440.2310.27320.2384I*''Z8.16334.18464.17123.94854.6294.45644.83064.0944.6796I*8.16333.19733.19022.98083.33633.253.5233.14943.119S''Z(MVA)816.3335.435.278156.5361.16870.66557.515173.1269.2561475.26I''Z(KA)12.73840.55240.55052.44260.95451.10270.89752.70141.080723.0207I(KA)12.73840.42210.4211.84390.6880.80420.65462.07810.796520.4468ich(KA)58.7Ich(KA)34.99第五节三中央35KVI段短路电流计算运行方式：1#变带三烧结、二烧结1#主风机3200KW、1#发电机、梅塞尔和焦烧变一、系统电抗图：

135二烧结3200KW风机电抗标幺值X=20%X100/(3.2/0.9)=5.625

136系统二、各元件电抗值换算：将三烧和二烧的电抗折算到绕组中压侧，得:二烧320位风机二烧3200KV风机X6,=X6+X2+X6XX2/X7=2.51+0.1555+2.51X0.1555/5.644=2.7347X7'=X7+X2+X7XX2/X6=5.644+0.1555+5.644X0.1555/2.51=6.1492再将系统、二烧和三烧的电抗折算到35KV侧，得：LY=1/X1+1/X6,+1/X7,+1/X3=1/0.12949+1/2.7347+1/6.1492+1/(-0.0056)=-170.32C=-170.32X(-0.0056)=0.9538Xr=0.12949X0.9538=0.1235X7”=2.7347X0.9538=2.6084

137X8''=6.1492X0.9538=5.8651三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.1235三烧结同步机：Xjs=2.6084X8.002/100=0.2087二烧结同步机：Xjs=5.8651X3.2/0.9/100=0.20851#发电机：Xjs=1.4147X15/100=0.2122梅塞尔同步机：Xjs=2.0505X10.7/0.95/100=0.231焦烧变同步机：Xjs=1.7031X12.6/0.9/100=0.2384四、短路电流计算：系统向短路点d-2提供的短路电流为：I0=1.5605/0.1235=12.6356KA三烧结同步机按XjS=0.2087查表用插值法求得：L=5.3211,1().2=3.759；因此向短路点d-2提供的短路电流为：11=5.3211X8.002/(1.732X35)=0.7024KA；二烧结3200KW同步机按Xjs=0.2085查表用插值法求得：b=5.3258,Io.2=3.7612；因此向短路点d-2提供的短路电流为：12=5.3258X(3.2/0.9)/(1.732X35)=0.3124KA；

1381#发电机按Xjs=0.2122查表用插值法求得：L=5.1356,Io.2=3.5782；因此向短路点d-2提供的短路电流为：13=5.1356X15/(1.732X35)=1.2708KA；梅塞尔同步机按Xjs=0.231查表用插值法求得：12=4.8306,b.2=3.523；因此向短路点d-2提供的短路电流为：14=4.8306X(10.7/0.95)/(1.732X35)=0.8975KA焦烧变同步机按Xjs=0.2384查表用插值法求得：1=4.6796,10.2=3.449因此向短路点d-2提供的短路电流为：14=4.6796X12.6/0.9/1.732X35=1.0807KAO因此，短路点的短路电流为：I,,=IO+I1+I2+I3+I4+15=12.6356+0.7024+0.3124+1.2708+0.8975+1.0807=16.8994A10.2=12.6356+3.759X8.002/1.732X35+3.7612X3.2/0.9/1.732X35+3.5782X15/1.732X35+3.523X10.7/0.95/1.732X35+3.449X12.6/0.9/1.732X35=12.6356+0.4962+0.2206+0.8854+0.6546+0.7965=15.6889KA短路冲击电流为：Ich=1.52X16.8994=25.69KAich=2.55X16.8994=43.09KA短路容量为：S=1.732X37X16.8994=1082.98MVA短路阻抗为：X*=l.5605/16.8994=0.09234三中央35KV侧短路电流计算结果表短路点符号系统三烧结二烧结1#发电机梅塞尔焦烧变总计三中央35KV侧短路点d-2EX0.12352.6084.5.S6511.41472.05051.7031Xjs0.12350.20870.20850.21220.2310.2384I*''Z8.09725.32115.32585.13564.83064.6796I*8.09723.7593.76123.57823.5233.449S''Z(MVA)809.7245.01320.0281.43857.51569.2561082.98

139I"Z(KA)12.63560.70240.31241.27080.89751.080716.899I(KA)12.63560.49620.22060.88540.65460.796515.689ich(KA)43.093Ich(KA)25.687第六节三中央35KVII段短路电流计算运行方式：2#变带二烧结4000KW风机、2#发电机、TRT和五高炉一、系统电抗图：二烧4000册I同步机二、各元件电抗值换算：将二烧和2#发电机的电抗折算到绕组中压侧，得:二烧4000KW同步机4.5190.15620.5523S-2嫉电机0.72762极电机5.9533

140X7'=X7+X2+X7XX2/X8=4.519+0.1562+4.519X0.1562/0.5523=5.9533X8'=X8+X2+X8XX2/X7=0.5523+0.1562+0.5523X0.1562/4.519=0.7276再将系统、三烧和2#发电机的电抗折算到35KV侧，得:SY=1/X1+1/X7,+1/X8,+1/X3=1/0.12979+1/5.9533+1/0.7276+1/(-0.00575)=7.7048+0.168+1.3744-173.913=-164.6658C=-l64.6658X(-0.00575)=0.9468Xr=0.12979X0.9468=0.1229X8”=5.9533X0.9468=5.6366X9),=0.7276X0.9468=0.6889三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.1229二烧结同步机：Xjs=5.6366X4/0.9/100=0.25042#发电机：Xjs=0.6889X37.5/100=0.2583TRT同步机：Xjs=1.5978X12.5/100=0.1997五高炉同步机：Xjs=0.6831X40/100=0.2732

141四、短路电流计算：系统向短路点(1-2提供的短路电流为：I0=1.5605/0.1229=12.6973KA二烧结同步机按Xj‘=0.2504查表用插值法求得：12=4.4614,Io.2=3.3394;因此向短路点d-2提供的短路点电流为：D=4.4614X(4/0.9)/(1.732X35)=0.3271KA；2#发电机按Xjs=0.2583查表用插值法求得：k=4.2076,Io,2=3.⑵3；因此向短路点d-2提供的短路点电流为：12=4.2076X37.5/(1.732X35)=2.6029KA；TRT同步机按Xjs=0.1997查表用插值法求得：L=5.4408,1().2=3.7195；因此向短路点d-2提供的短路点电流为：13=5.4408X12.5/(1.732X35)=1.1219KA；五高炉同步机：按Xjs=0.2732查表得：1=4.094,10.2=3.1494因此向短路点提供的短路电流为：14=4.094X40/1.732X35=2.7014KA。因此，短路点的短路电流为：r^IO+Il+12+13+14=12.6973+0.3271+2.6029+1.1219+1.0807+2.7014=19.4506KAIo.2=12.6973+3.3394X4/0.9/1.732X35+3.1213X37.5/1.732X35+3.7195X12.5/1.732X35+3.1494X40/1.732X35=12.6973+0.2448+1.9309+0.767+0.7965+2.0781=17.7181KA短路冲击电流为：Ich=1.52X19.4506=29.56KAich=2.55X19.4506=49.6KA短路容量为：S=1.732X37X19.4506=1246.47MVA短路阻抗为：X*=1.5605/19.4506=0.08023三中央35KV侧短路电流计算结果表短路占八、、符号系统二烧结2#发电机TRT五高炉总计二中XX0.12295.63660.68891.59780.6831央Xjs0.12290.25040.25830.19970.273235KVI*''Z8.13674.46144.20765.44084.094

142侧短路点d-21*8.13673.33943.12133.71593.1494S''Z(MVA)813.6720.9619166.80471.8958173.1171246.45r'Z(KA)12.69730.32712.60291.12192.701419.4506I(KA)12.69730.24481.93090.7672.078117.7181ich(KA)49.599Ich(KA)29.5649第七节二中央最大运行方式下10KV侧短路电流计算一、系统电抗图如下：二、各元件电抗值的换算：参照三中央35KV侧短路点d-2短路电流计算，将系统、三烧、二烧、2#发电机、梅塞尔、五高炉和焦烧变的电抗折算到35KV侧，得：X7”=3.35X12=0.6831Xr=O,1225X6”=3.338X8,,=0.7345X5=2.0505X13=1.7031等值电抗图如下：

143再将系统、三烧、二烧、2#发电机、梅塞尔、TRT、1#发电机、五高炉和焦烧变的电抗折算到二中央10KV侧，得：SY=1/Xr+1/X6,,+1/X7),+1/X8,,+1/X5,+1/X4+1/X12,+1/X13,=1/0.1225+1/3.338+1/3.35+1/0.7345+1/2.0505+1/0.2454+1/0.6831+1/1.7031=8.1663+0.2996+0.2985+1.3615+0.4877+4.07+1.4639+0.5872=16.7367C=SYXX4=16.7367X0.2454=4.1072XI”=0.1225X4.1072=0.5031X6,,,=3.338X4.1072=13.7098X7,,,=3.35X4.1072=13.7591X8,,,=0.7345X4.1072=3.0167X5,,=2.0505X4.1072=8.4218X12”=0.6831X4.1072=2.8056X13”=1.7031X4.1072=6.995X9=1.3524X10=1.1693三、简化等值电抗图：将各电抗折算成计算电抗：系统：Xjs=0.5031三烧结同步机：Xjs=13.7098X8.002/100=1.0971二烧结同步机：Xjs=13.7591X7.2/0.9/100=1.10072#发电机：Xjs=3.0167X37.5/100=1.1313TRT同步机：Xjs=1.3524X10/0.8/100=0.1691

1441#发电机:Xjs=l.1693X15/100=0.1754梅塞尔同步机：Xjs=8.4218X10.7/0.95/100=0.9486五高炉同步机：Xjs=2.8056X40/100=1.1222焦烧变同步机：Xjs=6.995X12.6/0.9/100=0.9793被三比二烧2嫉电机TRT喊电机梅塞尔五高炉焦烧变四、短路电流计算：系统向短路点d-3提供的短路电流为：10=5.5/0.503l=10.9322KA三烧结同步机：按Xjs=l.0971查表得：1=0.9647,10.2=0.9615因此向短路点提供的短路电流为：11=0.9647X8.002/1.732X10=0.4457KA二烧结同步机：按Xjs=l.1007查表得：1=0.9614,10.2=0.9585因此向短路点提供的短路电流为：12=0.9614X7.2/0.9/1.732义10=0.4441KA2#发电机：按Xjs=1.1313查表得：1=0.9137,10.2=0.8468因此向短路点提供的短路电流为：13=0.9137X37.5/1.732X10.5=1.8841KATRT同步机：按Xjs=0.1691查表得：1=6.4287,10.2=4.192因此向短路点提供的短路电流为：I4=6.4287X10/0.8/1.732义10=4.6397KA1#发电机：按Xjs=0.1754查表得：1=6.2058,10.2=4.096因此向短路点提供的短路电流为：15=6.2058X15/1.732X10.5=5.1186KA梅塞尔同步机:按Xjs=0.9486查表得：1=1.1198,10.2=1.1006因此向短路点提供的短路电流为：16=1.1198X10.7/0.95/1.732X10=0.7282KA五高炉同步机：按Xjs=1.1222查表得：1=0,9429,10.2=0,9417因此向短路点提供的短路电流为：I7=0.9429X40/1.732X10=2.1776KA焦烧变同步机：按Xjs=0.9793查表得：1=1.0846,10.2=1.0691因此向短路点提供的短路电流为：18=1.0846义12.6/0.9/1.732X10=0.8767KA因此，短路点d-2的短路电流为：1+I2+I3+I4+I5+I6+17+18=10.9322+0.4457+0.4441+1.8841+4.6397+5.1186+0.7282+2.1776+0.8767

145=27.2469KA10.2=10.9322+0.9615X8.002/1.732X10+0.9585X7.2/0.9/1.732X10+0.8468X37.5/1.732X10.5+4.192X10/0.8/1.732X10+4.096X15/1.732X10.5+1.1006X10.7/0.95/1.732X10+0.9417X40/1.732X10+1.0691X12.6/0.9/1.732X10=10.9322+0.4442+0.4427+1.7461+3.0254+3.3784+0.7157+2.1748+0.8642=23.7237KA短路冲击电流为：Ich=1.52X27.2469=41.42KAich=2.55X27.2469=69.48KA短路容量为：S=1.732X10.5X27.2469=495.51MVA短路阻抗为：X*=5.5/27.2469=0.2019二中央10KV侧短路电流计算结果表短路点符号系统三烧结二烧结2#发电机TRT1#发电机梅塞尔五.五炉焦烧变总计一中央10KV侧短路点d-3LX0.503113.7113.7593.01671.35241.16938.42182.80566.995Xjs0.50311.09711.10071.13130.16910.17540.94861.12220.9793I*''Z1.98770.96470.96140.91376.42876.20581.11980.94291.08461*1.98770.96150.95850.84684.1924.0961.10060.94171.0691S''Z(MVA)198.778.10558.076434.26484.37893.08713.24339.60215.944495.469I''Z(KA)10.93220.44570.44411.88414.63975.11860.72822.17760.876727.2469I(KA)10.93220.44420.11271.74613.02543.37840.71572.17480.864223.7237ich(KA)69.48Ich(KA)41.42第八节二中央10KVI段短路电流计算运行方式：三中央1#变带三烧结、二烧结1#主风机3200KW、1#发电机、梅塞尔和焦烧变一、系统电抗图如卜：

146系统二、各元件电抗值的换算：参照三中央35KV短路点d-2的短路电流计算，将系统、三烧、二烧、梅塞尔和焦烧变的电抗折算到35KV侧，得：XI'=0.1235X6”=2.6084X7”=5.8651X5=2.0505X13'=1.7031等值电抗图如下：再将系统、三烧、二烧、梅塞尔、焦烧变和1#发电机的电抗折算到二中央10KV侧,得：SY=1/Xr+1/X6,,+1/X7,,+1/X5,+1/X4+1/X13,=1/0.1235+1/2.6084+1/5.8651+1/2.0505+1/0.2454+1/1.7031=8.0972+0.3834+0.1705+0.4877+4.075+1.4639+0.5872=13.801

147C=SYXX4=13.801X0.2454=3.3868Xl''=0.1235X3.3868=0.4183X6"'=2.6084X3.3868=8.8341X7"'=5.8651X3.3868=19.8639X5”=2.0505X3.3868=6.9446XI3"=1.7031X3.3868=5.7681三、简化电抗等值电路：将各电抗折算成计算电抗：系统：Xjs=0.4183梅塞尔同步机：Xjs=6.9446X10.7/0.95/100=0.78221#发电机：Xjs=1.1693XI5/100=0.1754二烧结1#主风机3200KW：Xjs=l9.8639X3.2/0.9/100=0.7063三烧结同步机：Xjs=8.8341X8.002/100=0.7069焦烧变同步机：Xjs=5.7681X12.6/0.9/100=0.8075耒统三嫌同二房雷里aL*发电机悔霆尔焦烧变四、短路电流计算：系统向短路点d-3提供的短路电流为：I0=5.5/0.4183=13.1485KA三烧结同步机：按Xjs=0.7069查表得：1=1.5194,10.2=1,4389因此向短路点提供的短路电流为：Il=1.5194X8.002/1.732X10=0.702KA二烧结同步机：按Xjs=0.7063查表得：1=1.5206,10.2=1.4399因此向短路点提供的短路电流为：I2=1.5206X3.2/0.9/1.732X10=0.3122KA1#发电机:按Xjs=0.1754查表得：1=6.2058,10.2=4.096因此向短路点提供的短路电流为：13=6.2058X15/1.732X10.5=5.1186KA梅塞尔同步机:按Xjs=0.7822查表得：1=1.3688,10.2=1.3134因此向短路点提供的短路电流为：14=1.3688X10.7/0.95/1.732X10=0.8901KA焦烧变同步机:按Xjs=0.8075查表得：1=1.3237,10.2=1.2757因此向短路点提供的短路电流为：I5=L3237X12.6/0.9/1.732X10=1.1096KA因此，短路点d-3的短路电流为：

1481,,=10+11+12+13+14+15=13.1485+0.702+0.3122+5.1186+0.8901+1.1096=21.281KA10.2=13.1485+1.4389X8.002/1.732X10+1.4399X3.2/0.9/1.732X10+4.096X15/1.732X10.5+1.3134X10.7/0.95/1.732X10+1.2757X12.6/0.9/1.732X10=13.1485+0.6648+0.2956+3.3784+0.8541+1.0312=19.3726KA短路冲击电流为：Ich=1.52X21.281=32.35KAich=2.55X21.281=54.27KA短路容量为：S=1.732X10.5X21.281=386.96MVA短路阻抗为：X*=5.5/21.281=0.2584二匚「央10KV侧短路电流计算结果表短路占符号系统三烧结二烧结1#发电机梅塞尔焦烧变总计二中央10KV侧短路点d-3ZX0.41838.834119.8641.16936.94465.7681Xjs0.41830.70690.70630.17540.78220.8075I*J，Z2.390631.51941.52066.20581.36881.3237I*2.390631.43891.43994.0961.31341.2757S''Z(MVA)239.06312.7675.677793.08716.18720.179386.96I，，Z(KA)13.14850.7020.31225.11860.89011.109621.281I(KA)13.14850.66480.29563.37840.85411.031219.373ich(KA)54.266Ich(KA)32.347第九节二中央10KVII段短路电流计算运行方式：2#变带二烧结4000KW风机、2#发电机、TRT和五高炉

149、系统的电抗图:系统二、各元件电抗值的换算：将二烧和2#发电机的电抗折算到绕组中压侧，得:二烧4000KW同步机二烧4000KVX7'=X7+X2+X7XX2/X8=4.519+0.1562+4.519X0.1562/0.5523=5.9533X8=X8+X2+X8XX2/X7=0.5523+0.1562+0.5523X0.1562/4.519=0.7276再将系统、二烧和2#发电机的电抗折算到35KV侧，得：SY=1/X1+1/X7,+1/X8,+1/X3=1/0.12979+1/5.9533+1/0.7276+1/(-0.00575)=7.7048+0.168+1.3744-173.913=-164.6658C=-l64.6658X(-0.00575)=0.9468X1'=0.12979X0.9468=0.1229X7''=5.9533X0.9468=5.6366X8”=0.7276X0.9468=0.6889

150-0.00575系线二境4000蚌2峨:电机同步机系统二烧4000KW2燧电机同步机再将系统、二烧、2#发电机、TRT和五高炉的电抗折算到二中央1OKV侧，得:SY=1/Xr,+1/X7,,,+1/X8,,,+1/X4+1/X13,=1/0.1229+1/5.6366+1/0.6889+1/0.2454+1/0.6831=8.1367+0.1775+1.4516+4.075+0.5872+1.4639=15.3047C=XYXX4=15.3047X0.2454=3.7558Xl,5,=0.1229X3.7558=0.4616X7"''=5.6366X3.7558=21.1699X8"''=0.6889X3.7558=2.5911X13”=0.6831X3.7558=2.5656X9=1.3524三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.4616二烧结同步机：Xjs=21.1699X4/0.9/100=0.94092#发电机:Xjs=2.5911X37.5/100=0.9717TRT同步机：Xjs=1.3524X12.5/100=0.1691五高炉同步机：Xjs=2.5656X40/100=1.0262

151系统二施2#发电机TRT五高炉d-3四、短路电流计算：系统向短路点d-3提供的短路电流为：10=5.5/0.4616=11.9151KA二烧结同步机按Xjs=0.9409查表用插值法求得：12=1.1296,Io.2=1.1247；因此向短路点d-3提供的短路电流为：H=L1296X(4/0.9)/(1.732X10)=0.2899KA；2#发电机按Xjs=0.9717杳表用插值法求得：12=1.0933,Io.2=1.O769；因此向短路点d-3提供的短路电流为：12=1.0933X37.5/(1.732X10.5)=2.2544KA；TRT同步机按Xjs=0.1691查表用插值法求得：12=6.4287,Io.2=4.192；因此向短路点d-3提供的短路电流为：13=6.4287X12.5/(1.732X10)=4.6397KA；五高炉同步机按XjS=1.0262查表用插值法求得：12=1.0338,10.2=1.0239；因此向短路点d-3提供的短路电流为：14=1.0338X40/(1.732X10)=2.3875KA；因此，短路点的短路电流为：I''=I0+Il+I2+I3+14=11.9151+0.2899+2.2544+4.6397+2.3875=21.4866KAIo.2=H.9151+1.1247X4/0.9/1.732X10+1.0769X37.5/1.732X10.5+4.192X12.5/1.732X10+1.0239X40/1.732X10=11.9151+0.2886+2.2206+3.0254+2.3647=19.8144KA短路冲击电流为：Ich=1.52X21.4866=32.66KAM=2.55X21.4866=54.79KA短路容量为：S'=1.732X10.5X21.4866=390.71MVA短路阻抗为：X*=5.5/21.4866=0.256

152二中央10KV侧兔豆路电流计算结果表短路占/、、、符号系统二烧结2#发电机TRT五高炉总计二中央10KV侧短路点d-3EX0.461621.172.59111.35242.5656Xjs0.46160.94090.97170.16911.0262I*''Z2.166381.12961.09336.42871.0338I*2.166381.12471.07694.1921.0239S''Z(MVA)216.6385.272140.99984.37843.419390.705r'Z(KA)11.91510.28992.25444.63972.387521.4866I(KA)11.91510.28862.22063.02542.364719.8144ich(KA)54.7908Ich(KA)32.6596第十节梅塞尔最大运行方式下10KV侧短路电流计算一、系统电抗图：

153二、各元件电抗值换算:参照35KV短路点短路电流计算，将系统、三烧、二烧、2#发电机、TRT和1#发电机的电抗折算到35KV侧，得:Xr=0.1225X6”=3.338X7”=3.35X8”=0.7345X9'=1.8816X10'=1.6269等值电路图如下:再将系统、三烧、二烧、2#发电机、TRT、1#发电机、梅塞尔、五高炉和焦烧变的电抗折算到梅塞尔10KV侧，得：LY=l/Xr+l/X6,,+l/X7,,+l/X8,,+l/X9,+l/X10,+l/X5+l/X12,+l/X13,=1/0.1225+1/3.338+1/3.35+1/0.7345+1/1.8816+1/1.6269+1/0.2631+1/0.6831+1/1.7031=8.1633+0.2996+0.2985+1.3615+0.5315+0.6147+3.8008+1.4639+0.5872

154=17.121C=SYXX5=17.121X0.2631=4.5045Xl5,=XrXC=0.1225X4.5045=0.5518X6"'=X6''XC=3.338X4.5045=15.036X7"'=X7"XC=3.35X4.5045=15.09X8'''=X8"XC=0.7345X4.5045=3.3086X9''=X9'XC=1.8816X4.5045=8.4757XIO''=X1O'XC=1.6269X4.5045=7.3284X12''=X12'XC=0.6831X4.5045=3.077XI3''=XI3'XC=1,7031X4.5045=7.6716三、简化等值电抗图：将各电抗全部换算成计算电抗：系统：Xjs=0.5518三烧结同步机：Xjs=15.036X8.002/100=1.2032二烧结同步机：Xjs=15.09X7.2/0.9/100=1.20722#发电机：Xjs=3.3086X37.5/100=1.2407TRT同步机：Xjs=8.4757X10/0.8/100=1.05951#发电机：Xjs=7.3284X15/100=1.0993梅塞尔同步机：Xjs=1.7874X10.7/0.95/100=0.2013五高炉同步机：Xjs=3.077X40/100=1.2308焦烧变同步机：Xjs=7.6716X12.6/0.9/100=1.074系统三烧二烧2娥电机TRT1峨电机梅塞尔五高炉焦烧变?0.55181,2032$1.2072/12407/1.0595A,0993If11—‘«d-4四、短路电流计算：系统向短路点d4提供的短路电流为：I0=5.5/0.5518=9.9674KA三烧结同步机：按Xjs=l.2032查表得：1=0.8776,10.2=0,8829因此向短路点提供的短路电流为：Il=0.8776X8.002/1.732X10=0.4055KA

155二烧结同步机：按Xjs=1.2072查表得：1=0.8747,10.2=0.8802因此向短路点提供的短路电流为：I2=0.8747X7.2/0.9/1.732X10=0.404KA2#发电机:按Xjs=1.2407查表得：1=0.8315,10.2=0.7748因此向短路点提供的短路电流为：I3=0.8315X37.5/1.732X10.5=1.7146KATRT同步机：按Xjs=l.0595查表得：1=0.9765,10.2=0.9024因此向短路点提供的短路电流为：I4=0.9765X10/0.8/1.732X10=0.7047KA1#发电机：按Xjs=1.0993查表得：1=0.9406,10.2=0.8706因此向短路点提供的短路电流为：I5=0.9406X15/1.732X10.5=0.7758KA梅塞尔同步机:按Xjs=0.2013查表得：1=5.4954,10.2=3.8415因此向短路点提供的短路电流为：I6=5.4954X10.7/0.95/1.732X10=3.5736KA五高炉同步机：按Xjs=1.2308查表得：1=0.8572,10.2=0.8647因此向短路点提供的短路电流为：I7=0.8572X40/1.732X10=1.9797KA焦烧变同步机：按Xjs=1.074杳表得：1=0.9864,10.2=0.9814因此向短路点提供的短路电流为：I8=0.9864X12.6/0.9/1.732X10=0,7973KA因此，短路点d-4的短路电流为：r^IO+11+I2+I3+I4+I5+I6+17+18=9.9674+0.4055+0.404+1.7146+0.7047+0.7758+3.5736+1.9797+0.7973=20.3226KA10.2=9.9674+0.8829X8.002/1.732X10+0.8802X7.2/0.9/1.732X10+0.7748X37.5/1.732X10.5+0.9024X10/0.8/1.732X10+0.8706X15/1.732X10.5+3.8415X10.7/0.95/1.732X10+0.8647X40/1.732X10+0.9814X12.6/0.9/1.732X10=9.9674+0.4079+0.4066+1.5977+0.6513+0.7181+2.4981+1.997+0.7933=19.0374KA短路冲击电流为：Ich=1.52X20.3226=30.89KAich=2.55X20.3226=51.82KA短路容量为：S=1.732X10.5X20.3226=369.59MVA短路阻抗为：X*=5.5/20.3226=0.2706梅塞尔10KV侧短路电流计算结果表

156短路点符号系统三烧结二烧结2#发电机TRT1#发电机梅塞尔五高炉焦烧变总计

157梅塞尔10KV侧短路点d-4EX0.551815.03615.093.30868.47577.32841.78743.0777.6716Xjs0.55181.20321.20721.24071.05951.09930.20131.23081.0741*''Z1.81230.87760.87470.83150.97650.94065.49540.85720.98641*1.81230.88290.88020.77480.90240.87063.84150.86470.9814S''Z(MVA)181.237.37447.317131.181712.815714.108764.989536.00314.4997369.55I''Z(KA)9.96740.40550.4041.71460.70470.77583.57361.97970.797320.3226I(KA)9.96740.40790.40661.59770.65130.71812.49811.9970.793319.0374ich(KA)51.82Ich(KA)30.89第十一节梅塞尔10KVI段短路电流计算运行方式：1#主变带三烧、二烧3200KW风机、1#发电机、梅塞尔和焦烧变一、系统电抗图：东线二、各元件电抗值换算：参照短路点d-2短路电流计算，将系统、三烧、二烧、1#发电机和焦烧变的电抗折算到35KV侧，得：Xl'=0.1235X6,,=2.6084X7''=5.8651X4'=1.4147X12'=0.6831再将系统、三烧、二烧、1#发电机、梅塞尔和焦烧变的电抗折算到梅塞尔10KV侧,得:

158LY=1/Xr+1/X6,,+1/X7,,+1/X4,+1/X5+1/X13,=1/0.1235+1/2.6084+1/5.8651+1/1.4147+1/0.2631+1/1.7031=8.0972+0.3834+0.1705+0.7069+3.8008+0.5872=13.746C=SYXX5=13.746X0.2631=3.6166X1”=0.1235X3.6166=0.4467X6"'=2.6084X3.6166=9.4335X7,,,=5.8651X3.6166=21.2117X4''=l.4147X3.6166=5.1164X13),=1.7031X3.6166=6.1594三、简化等值电抗图：将各电抗折算成计算电抗：系统：Xjs=0.4467梅塞尔同步机：Xjs=l.7874X10.7/0.95/100=0.20131#发电机：Xjs=5.1164X15/100=0.7675二烧结1#主风机3200KW：Xjs=21.2117X3.2/0.9/100=0.7542三烧结同步机：Xjs=9.4335X8.002/100=0.7549焦烧变同步机：Xjs=6.1594X12.6/0.9/100=0.8623.系统三烧同步机二言:瑞KW发电机梅塞尔焦烧变四、短路电流计算：系统向短路点d-4提供的短路电流为：I0=5.5/0.4467=12.3125KA三烧结同步机：按Xjs=0.7549查表得：1=1.419,10.2=1,3555

159因此向短路点提供的短路电流为：Il=1.419X8.002/1.732X10=0.6556KA二烧结同步机：按Xjs=0.7542查表得：1=1.4203,10.2=1.3565因此向短路点提供的短路电流为：I2=1.1.4203X3.2/0.9/1.732X10=0.2916KA1#发电机:按Xjs=0.7675查表得：1=1.3589,10.2=1.2271因此向短路点提供的短路电流为：13=1.3589X15/1.732X10.5=1.1208KA梅塞尔同步机:按Xjs=0.2013查表得：1=5.4954,10.2=3.8415因此向短路点提供的短路电流为：I4=5.4954X10.7/0.95/1.732X10=3.5736KA焦烧变同步机：按Xjs=0.8623查表得：1=1.2363,10.2=1.2017因此向短路点提供的短路电流为：15=1.2363义12.6/0.9/1.732X10=0.9993KA因此，短路点d4的短路电流为：I''=IO+I1+I2+I3+I4+I5=12.3125+0.6556+0.2916+1.1208+3.5736+0.9993=18.9534KA10.2=12.3125+1.3555X8.002/1.732X10+1.3565X3.2/0.9/1.732X10+1.2271X15/1.732X10.5+3.8415X10.7/0.95/1.732X10+1.2017X12.6/0.9/1.732X10=12.3125+0.6263+0.2785+1.0121+2.4981+0.9714=17.6989KA短路冲击电流为：Ich=1.52X18.9534=28.81KAich=2.55X18.9534=48.48KA短路容量为：S,=1.732X10.5X18.9534=344.69MVA

160短路阻抗为：X*=5.5/18.9534=0.2902梅裳第尔10KV侧短路电流计算结月艮表短路点符号系统三烧结二烧结1#发电机梅塞尔焦烧变总计梅塞尔10KV侧短路点d-4LX0.44679.433521.2125.11641.78746.1594X.is0.44670.75490.75420.76750.20130.8623I*''Z2.238641.4191.42031.35895.49541.2363I*2.238641.35551.35651.22713.84151.2017S''Z(MVA)223.86411.9235.30320.38364.98918.173344.64r'Z(KA)12.31250.65560.29161.12083.57360.999318.953I(KA)12.31250.62630.27851.01212.49810.971417.699ich(KA)48.483Ich(KA)28.809第十二节焦烧变最大运行方式下10KV侧短路电流计算一、系统电抗图：系统二、各元件电抗值换算：将系统、三烧、二烧、2#发电机、TRT、1#发电机、梅塞尔和五高炉的电抗折算到三中央35KV侧，（参照三中央35KV侧短路电流计算）得：

161XI'=0.1225X7”=3.338X8”=3.35X9”=0.7345X10'=1.8816Xir=1.6269X12'=2.0505X13'=0.6831等值电抗图如下：将系统、三烧、二烧、2#发电机、TRT、1#发电机、梅塞尔和五高炉的电抗折算到焦烧变10KV侧，得:SY=l/Xl,+l/X7,,+l/X8,,+l/X9),+l/X10,+l/Xir+l/X12,+l/X13,+l/X14=1/0.1225+1/3.338+1/3.35+1/0.7345+1/1.8816+1/1.6269+1/2.0505+1/0.6831+1/0.2631=8.1633+0.2996+0.2985+1.3615+0.5315+0.6147+0.4877+1.4639+3.8008=16.9945C=EYXX5=16.9945X0.2631=4.4713X1”=X1'XC=O.1225X4.4713=0.5477X7'''=X6"XC=3.338X4.4713=14.9252X8"'=X7''XC=3.35X4.4713=14.9789X9"'=X8''XC=0.7345X4.4713=3.2842X10''=X9'XC=1.8816X4.4713=8.4132XI1"=X1O'XC=1.6269X4.4713=7.2744XI2''=XI2'XC=2.O5O5X4.4713=9.1684X13"=X13'XC=0.6831X4.4713=3.0543三、简化等值电抗图：将各电抗全部换算成计算电抗：系统：Xjs=0.5477三烧结同步机：Xjs=14.9252X8.002/100=1.1943二烧结同步机：Xjs=14.9789X7.2/0.9/100=1.19832#发电机:Xjs=3.2842X37.5/100=1.2316TRT同步机：Xjs=8.4132X10/0.8/100=1.0517

1621#发电机:Xjs=7.2744X15/100=1.0912梅塞尔同步机：Xjs=9.1684X10.7/0.95/100=1.0327五高炉同步机：Xjs=3.0543X40/100=1.2217焦烧变同步机：Xjs=1.44X12.6/0.9/100=0.2016不蜕三凳2・发电机THT1女电机将鎏尔五高加制极四、短路电流计算：系统向短路点d-5提供的短路电流为：I0=5.5/0.5477=10.042KA三烧结同步机：按Rs=l.1943查表得：1=0.8844,10.2=0.889因此向短路点提供的短路电流为：Il=0.8844X8.002/1.732X10=0.4086KA二烧结同步机：按Xjs=1.1983查表得：1=0.8813,10.2=0.8862因此向短路点提供的短路电流为：12=0.8813X7.2/0.9/1.732X10=0.4071KA2#发电机：按Xjs=1.2316查表得：1=0.8379,10.2=0.7804因此向短路点提供的短路电流为：I3=0.8379X37.5/1.732X10.5=1.7278KATRT同步机:按Xjs=1.0517查表得：1=0.9835,10.2=0.9086因此向短路点提供的短路电流为：I4=0.9835X10/0.8/1.732X10=0.7098KA1#发电机：按Xjs=1.0912查表得：1=0.9479,10.2=0.877因此向短路点提供的短路电流为：I5=0.9479X15/1.732X10.5=0.7818KA梅塞尔同步机：按Xjs=1.0327查表得：1=1.027,10.2=1.0179因此向短路点提供的短路电流为：16=1.027X10.7/0.95/1.732X10=0.6679KA五高炉同步机：按Rs=1.2217查表得：1=0.8639,10.2=0.8707因此向短路点提供的短路电流为：I7=0.8639X40/1.732X10=1.9952KA焦烧变同步机：按Xjs=0.2016查表得：1=5.4883,1（）.2=3.8382；因此向短路点提供的短路电流为：I8=5.4883X12.6/0.9/1.732X10=4.4363KA因此，短路点d-5的短路电流为：I)^IO+11+I2+I3+I4+I5+I6+17+18=10.042+0.4086+0.4071+1.7278+0.7098+0.7818+0.6679+1.9952+4.4363=21.1765KA

16310.2=10.042+0.889X8.002/1.732X10+0.8862X7.2/0.9/1.732X10+0.7804X37.5/1.732X10.5+0.9086X10/0.8/1.732X10+0.877X15/1.732X10.5+1.0179X10.7/0.95/1.732X10+0.8707X40/1.732X10+3.8382X12.6/0.9/1.732X10=10.042+0.4107+0.4093+1.6092+0.6557+0.7234+0.6619+2.0109+3.1025=19.6256KA短路冲击电流为：Ich=1.52X21.1765=32.2KAich=2.55X21.1765=54KA短路容量为：S'=1.732X10.5X21.1765=385.12MVA短路阻抗为：X*=5.5/21.1765=0.2597焦烧变10KV例短路电流计算结果表短路点符号系统■:烧结二烧结2#发电机TRT1#发电机丘高炉焦烧变总计焦烧变10KV侧短路点d-6EX0.547714.92514.9793.28428.41327.27449.16843.05431.44Xjs0.31771.19431.19831.23161.05171.09121.03271.22170.2016I*''Z1.82580.88440.88130.83790.98350.94791.0270.86395.4883I*1.82580.8890.88620.78040.90860.8771.01790.87073.8382S''Z(MVA)182.587.43087.403531.42212.908414.217812.14636.28580.6786385.072I''Z(KA)10.0420.40860.40711.72780.70980.78180.66791.99524.436321.1765I(KA)10.0420.41070.40931.60920.65570.72340.66192.01093.102519.6256ich(KA)54Ich(KA)32.2第十三节焦烧变10KVI短路电流计算

164运行方式：1#主变带三烧、二烧3200KW风机、1#发电机、梅塞尔和焦烧变一、系统电抗图：毒需同二施L#发电机恒塞尔焦烧变32OOKW同步机二、各元件电抗值换算：参照短路点d-2短路电流计算，将系统、三烧、二烧、1#发电机和梅塞尔的电抗折算到35KV侧，得:Xr=0.1235X6”=2.6084X7''=5.8651X4'=1.4147X5=2.0505拢8步二高电;机疮奈不再将系统、三烧、二烧、1#发电机、梅塞尔和五高炉的电抗折算到梅塞尔10KV侧,得:LY=1/X1,+1/X6,,+1/X7),+1/X4,+1/X6+1/X5,=1/0.1235+1/2.6084+1/5.8651+1/1.4147+1/0.2631+1/2.0505

165=8.0972+0.3834+0.1705+0.7069+5.8343+3.8008+0.4877=13.6465C=XYXX5=13.6465X0.2631=3.5904XI”=0.1235X3.5904=0.4434X6"'=2.6084X3.5904=9.3652X7'”=5.8651X3.5904=21.0581X4"=1.4147X3.5904=5.0793X5"=2.0505X3.5904=7.3621三、简化等值电抗图：将各电抗折算成计算电抗：系统：Xjs=0.4434梅塞尔同步机：Xjs=7.3621X10.7/0.95/100=0.82921#发电机：Xjs=5.0793X15/100=0.7619二烧结1#主风机3200KW：Xjs=21.0581X3.2/0.9/100=0.7487三烧结同步机：Xjs=9.3652X8.002/100=0.7494焦烧变同步机：Xjs=1.44X12.6/0.9/100=0.2016W球三烧二烧3200KWgdu/，后亦系统同步机同步机1#发电机梅塞尔焦烧变四、短路电流计算：系统向短路点d-5提供的短路电流为：10=5.5/0.4434=12.4041KA三烧结同步机：按Xjs=0.7494查表得：1=1.4293,10.2=1.3641因此向短路点提供的短路电流为：11=1.4293X8.002/1.732义10=0.6603KA二烧结同步机：按Xjs=0.7487查表得：1=1.4308,10.2=1.3653因此向短路点提供的短路电流为：I2=1.4308X3.2/0.9/1.732X10=0.2937KA1#发电机:按Xjs=0.7619查表得：1=1.3688,10.2=1.2354因此向短路点提供的短路电流为：13=1.3688X15/1.732X10.5=1.129KA梅塞尔同步机:按Xjs=0.8292查表得：1=1.2881,10.2=1.2457因此向短路点提供的短路电流为：14=1.2881X10.7/0.95/1.732X10=0.8376KA

166焦烧变同步机：按Xjs=0.2016查表得：1=5.4883,10.2=3.8382因此向短路点提供的短路电流为：I5=5.4883X12.6/0.9/1.732X10=4.4363KA因此，短路点d-5的短路电流为：r=I0+Il+I2+I3+I4+I5=12.4041+0,6603+0.2937+1.129+0.8376+4.4363=19.761KA10.2=12.4041+1.3641X8.002/1.732X10+1.3653X3.2/0.9/1.732X10+1.2354X15/1.732X10.5+1.2457X10.7/0.95/1.732X10+3.8382X12.6/0.9/1.732X10=12.4041+0.6302+0.2803+1.109+0.8101+3.1025=18.3362KA短路冲击电流为：Ich=1.52X19.761=30.04KAich=2.55X19.76l=50.39KA短路容量为：S'=1.732X10.5X19.761=359.37MVA短路阻抗为：X*=5.5/19.761=0.2783焦烧变10KV侧短路电流计算结果表短路点符号系统二烧结1#发电机三烧梅塞尔焦烧变总计焦烧变10KV侧短路点d-50.443421.0585.0799.36527.36211.44Xjs0.44340.74870.7620.74940.82920.2016I*''Z2.25531.43081.3691.42931.28815.4883I*2.25531.36531.2351.36411.24573.8382S，，Z(MVA)225.535.341220.5312.00815.23380.679359.323r'Z(KA)12.40410.29371.1290.66030.83764.436319.761I(KA)12.40410.28031.1090.63020.81013.102518.3362ich(KA)50.3907Ich(KA)30.0368第十四节五高炉最大运行方式下10KV侧短路电流计算

167一、系统电抗图:二、各元件电抗值换算将系统、三烧、二烧、2#发电机、TRT、1#发电机、梅塞尔和焦烧变的电抗折算到三中央35KV侧，（参照三中央35KV侧短路电流计算）得：XI'=0.1225X7”=3.338X8”=3.35X9”=0.7345X10'=1.8816XIT=1.6269X12'=2.0505X14=1.7031等值电抗图如下：再将系统、三烧、二烧、2#发电机、TRT、1#发电机、梅塞尔和焦烧变的电抗折算到五高炉10KV侧，得：

168SY=l/Xl,+l/X7),+l/X8,,+l/X9,,+l/X10,+l/Xir+l/X12,+l/X14,+l/X13=1/0.1225+1/3.338+1/3.35+1/0.7345+1/1.8816+1/1.6269+1/2.0505+1/1.7031+1/0.1714=8.1633+0.2996+0.2985+1.3615+0.5315+0.6147+0.4877+5.8343+0.5872=18.1783C=SYXX5=18.1783X0.1714=3.1158X1"=X1'XC=0.1225X3.1158=0.3817X7"'=X6''XC=3.338X3.1158=10.4X8'"=X7''XC=3.35X3.1158=10.4379X9'"=X8''XC=0.7345X3.ll58=2.2886X10"=X9'XC=1.8816X3.1158=5.8627Xll''=X10'XC=1.6269X3.1158=5.0691X12''=X12'XC=2.0505X3.1158=6.3889X14"=X13'XC=1.7031X3.1158=5.3065三、简化等值电抗图：将各电抗全部换算成计算电抗：系统:Xjs=0.3817三烧结同步机：Xjs=10.4X8.002/100=0.8322二烧结同步机：Xjs=10.4379X7.2/0.9/100=0.8352#发电机：Xjs=2.2886X37.5/100=0.8582TRT同步机：Xjs=5.8627X10/0.8/100=0.73281#发电机:Xjs=5.0691X15/100=0.7604梅塞尔同步机：Xjs=6.3889X10.7/0.95/100=0.7196五高炉同步机：Xjs=0.5117X40/100=0.2047焦烧变同步机：Xjs=5.3065X12.6/0.9/100=0.7429乐场三友二域2血电机tuti女电机樽塞尔五高炉焦烧变

169

170四、短路电流计算：系统向短路点d-6提供的短路电流为：10=5.5/0.3817=14.4092KA三烧结同步机：按Xjs=0.8322查表得：1=1.2832,10.2=1.2416因此向短路点提供的短路电流为：11=1.2832X8.002/1.732X10=0.5929KA二烧结同步机：按Xjs=0.835查表得：1=1.2786,10.2=1.2377因此向短路点提供的短路电流为：I2=1.2786X7.2/0.9/1.732X10=0.5906KA2#发电机：按Xjs=0.8582查表得：1=1.2107,10.2=1.1043因此向短路点提供的短路电流为：I3=1.2107X37.5/1.732X10.5=2.4965KATRT同步机：按Xjs=0.7328查表得：1=1.4141,10.2=1.2726因此向短路点提供的短路电流为：14=1.4141X10/0.8/1.732X10=1.0206KA1#发电机:按Xjs=0.7604查表得：1=1.3715,10.2=1.2376因此向短路点提供的短路电流为：I5=L3715X15/L732X10.5=1.1312KA梅塞尔同步机：按Xjs=0.7196查表得：1=1.4924,10.2=1.4165因此向短路点提供的短路电流为：I6=1.4924X10.7/0.95/1.732X10=0.9705KA五高炉同步机：按为s=0.2047查表得：1=5.4153,10.2=3.8036因此向短路点提供的短路电流为：I7=5.4153X40/1.732X10=12.5064KA*焦烧变同步机：按Xjs=0.7429查表得：1=1.4431,10.2=1.3755因此向短路点提供的短路电流为：18=1.4431X12.6/0.9/1.732X10=1.1665KA因此，短路点d-5的短路电流为：r^IO+11+I2+I3+I4+I5+I6+17+18=14.4092+0.5929+0.5906+2.4965+1.0206+1.1312+0.9705+12.5064+1.1665=34.8844KA10.2=14.4092+1.2416X8.002/1.732X10+1.2377X7.2/0.9/1.732X10+1.1043X37.5/1.732X10.5+1.2726X10/0.8/1.732X10+1.2376X15/1.732X10.5+1.4165X37.6/0.95/1.732X10+3.8036X40/1.732X10+1.3755X12.6/0.9/1.732X10=14.4092+0.5736+0.5717+2.2771+0.9184+1.0208+0.9211+8.7843+1.1118=30.588KA短路冲击电流为：Ich=1.52X34.8844=53.02KAich=2.55X34.8844=88.96KA短路容量为：S'=1.732X10.5X34.8844=634.41MVA短路阻抗为：

171X*=5.5/34.8844=0.1577

172五高炉10KV傀短路电流计算结果表短路点符号系统三烧结二烧结2#发电机TRT1#发电机梅塞尔五高炉焦烧变总计梅塞尔10KV侧短路点d-5EX0.381710.410.4382.28865.86275.06916.38890.51175.3065Xjs0.38170.83220.8350.85820.73280.76040.71960.20470.7429I*''Z2.61991.28321.27861.21071.11111.37151.49245.41531.4431I*2.61991.24161.23771.10431.27261.23761.41653.80361.3755S''Z(MVA)261.9910.78210.74145.40118.56120.57217.65227.44121.211634.352r*Z(KA)14.40920.59290.59062.49651.02061.13120.970512.50641.166534.8844I(KA)14.40920.57360.57172.27710.91841.02080.92118.78431.111830.588ich(KA)88.96Ich(KA)53.02第十五节五高炉10KVI段短路电流计算运行方式：2#变带二烧4000KW的风机、2#发电机、TRT和五高炉一、系统电抗图：系统二、各元件电抗值换算：将系统、二烧、2#发电机和TRT的电抗折算到35KV侧（参照35KV短路电流计算)，有：X9”=0.6899X10'=1.5978XI'=0.1229X8''=5.6366

173再将系统、二烧、2#发电机、TRT和五高炉的电抗折算到五高炉的10KV侧,有：XY=1/0.1229+1/5.6366+1/0.6889+1/1.5978+1/0.1714=8.1367+0.1775+1.4516+0.5872+5.8343=16.226C=0.1714X16.226=2.7811Xl=0.1229X2.7811=0.3418X8”=5.6366X2.7811=15.6759X9”=0.6889)<2.7811=1.9159XlO^l.5978X2.7811=4.4436XI3=0.5117三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.3418二烧同步机：Xjs=15.6759X4/0.9/100=0.69672#发电机:Xjs=1.9159X37.5/100=0.7185TRT同步机：Xjs=4.4436X12.5/100=0.5555五高炉同步机：Xjs=0.5117X40/100=0.2047系统节2峨电机TRT五高炉同步机

174四、短路电流计算：系统向短路点d-6提供的短路电流为：I0=5.5/0.3418=16.0913KA二烧结4000KW同步机按Xjs=0.6967查表用插值法求得：1=1.5422,Io.2=1.4575；因此向短路点提供的短路电流为：Il=1.5422X4/0.9/1.732X10=0.3957KA；2#发电机按Xjs=0.7185查表用插值法求得：1=1.4543,Io.2=L3O53；因此向短路点提供的短路电流为：I2=1.4543X37.5/1.732X10.5=2.9988KA；TRT同步机按Xjs=0.5555查表用插值法求得：1=1.8948,Io.2=L6511；因此向短路点提供的短路电流为：I3=1.8948X12.5/1.732X10=1.3675KA；五高炉同步机按XjS=0.2047查表用插值法求得：1=5.4153,Io,2=3.8O36；因此向短路点提供的短路电流为：I4=5.4153X40/1.732X10=12.5064KA；因此短路点d-6的短路电流为：r=10+11+12+13+14=16.0913+0.3957+2.9988+1.3675+12.5064=33.3597KA10.2=16.0913+1.4575X4/0.9/1.732X10+1.3053X37.5/1.732X10.5+1.6511X12.5/1.732X10+3.8036X40/1.732X10=16.0913+0.374+2.8261+1.1916+8.7843=29.2673KA短路冲击电流为：Ich=1.52X1”=1.52X33.3597=50.71KAich=2.55XI"=2.55X33.3597=85.07KA短路容量为：S=1.732X10.5X33.3597=606.61MVA短路阻抗为：X*=5.5/33.3597=0.1649五高炉10KV侧短路电流计算结果表短路点符号系统二烧结2#发电机TRT五高炉总计日高XX0.341815.6761.91594.44360.5117炉Xjs0.34180.69670.71850.55550.204710KVI*''Z2.925691.54221.45431.89485.4153侧短I*2.925691.45751.30531.65113.8036路点S''Z(MVA)292.5697.196254.53624.869227.44606.6119

175d-6I"Z(KA)16.09130.39572.99881.367512.50633.35968I(KA)16.09130.3742.82611.19168.784329.26728ich(KA)85.06719Ich(KA)50.70672第十六节三中央最小运行方式下短路电流计算三中央最小运行方式为：2#主变带负荷（不包括同步机和发电机），系统阻抗为：0.0020l+j0.0943,本计算以电抗为主。一、最小运行方式的系统图:三中央二中央梅塞尔五高炉焦烧变31.5MVA793%二、系统等值电抗图:

176系统<\0.0943、0.1099-0.00575—.八0.07760.0786\0,0114<0,234\0,0114<0,2517\0,0114(0.16\0,0114<0,2517三中央二中央梅塞尔五高炉焦烧变以上参数参照最大运行方式下的短路电流计算。三、短路电流计算：㈠当三中央10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-1的总电抗标幺值为:£X=X1+X2=0.2042+0.1562=0.3604基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：Imin=5.5/0.3604=15.2608KAIc=1.52X15.2608=23.2KAic=2.55X15.2608=38.92KA短路容量为：S=1.732X10.5X15.2608=277.53MVA㈡当三中央35KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-2的总电抗标幺值为:

177£X=Xl+X3=0.2042+(-0.00575)=0.19845基准电流为：Ijz=100/1.732X37=1.5605KA所以短路电流为：Imin=l.5605/0.19845=7.8634KA-O.00575s/,d-235KVIc=1.52X7.8634=11.95KAic=2.55X7.8634=20.05KA短路容量为：S=1.732X37X7.8634=503.92MVA㈢当二中央10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-3的总电抗标幺值为:£X=Xl+X3+X4=0.2042+(-0.00575)+0.2454=0.44385基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：Imin=5.5/0.44385=12.3916KAIc=1.52X12.3916=18.84KAic=2.55XI2.3916=31.6KA短路容量为：S=1.732X10.5X12.3916=225.35MVA㈣当梅塞尔10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-4的总电抗标幺值为:£X=Xl+X3+X5=0.2042+(-0.00575)+0.2631=0.46155

178基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：hnin=5.5/0.46155=11.9164KAIc=1.52Xl1.9164=18.11KAic=2.55X11.9164=30.39KA短路容量为：S=1.732X10.5X11.9164=216.71MVA㈤当焦烧变10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-6的总电抗标幺值为:LX=Xl+X3+X7=0.2042+(-0.00575)+0.2631=0.46155基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：Imin=5.5/0.46155=11.9164KAIc=1.52X11.9164=18.11KAic=2.55X11.9164=30.39KA短路容量为：S=1.732X10.5X11.9164=216.71MVA伏)当五高炉10KV侧发生短路时，等值电路为：根据各元件的电抗值，可得出系统到短路点d-5的总电抗标幺值为:

179£X=Xl+X3+X6=0.2042+(-0.00575)+0.1714=0.36985基准电流为：Ijz=100/1.732X10.5=5.5KA所以短路电流为：Imin=5.5/0.36985=14.8709KA系统Ic=1.52X14.8709=22.6KAic=2.55X14.8709=37.92KA短路容量为：S=1.732X10.5X14.8709=270.44MVA第五章四中央短路电流计算第一节四中央10KV最大运行方式下短路电流计算一、计算依据：电业局提供三中央2005年度短路阻抗值，最大运行方式：0.00201+jO.019957,最小运行方式：0.001837+j0.09322,本计算以电抗为主。以1#、2#主变带全所负荷发电机并网为最大运行方式。二、最大运行方式系统图：系统

180cos4>=0.9520%三、各元件电抗计算：变压器电抗：1#主变按Udi.2=13.06%,Udi.3=22.91%Ud2.3=8.0%因止匕：X1=1/2X(0.1306+0.2291-0.08)=0.13985X2=1/2X(0.1306+0.08-0,2291)=-0.00925X3=1/2X(0.2291+0.08-0.1306)=0.08925于是电抗标幺值为：XBi=0.13985X100/120=0.11654Xb2=-0.00925X100/120=-0.00771Xb3=0.08925X100/120=0.074382#主变按Ud|.2=13.19%,Udi.3=22.99%Ud2.3=8.0%因此：X1=1/2X(0.1319+0.2299-0.08)=0.1409X2=1/2X(0.1306+0.08-0.2291)=-0.009X3=1/2X(0.2291+0.08-0.1306)=0.089于是电抗标幺值为：Xbi=0.1409X100/120=0.11742Xb2=-0.009X100/120=-0.0075Xb3=0.089X100/120=0.07417因此全部按1#主变计算。电抗器电抗：Xk=0.0786

181梅塞尔同步机的电抗：X=20%X100/(7.4+3.3)/0.95=1.776电缆电抗标幺值：X=0.0114(参照三中央电缆标幺值)梅塞尔变压器：Xb=7.85%X100/31.5=0.2492轧板变变压器：X=7.74%X100/31.5=0.2457电缆电抗标幺值:梅塞尔侧：Xdr=0.12X2.71/2X100/372=0.01188轧板变侧：Xdl=0.12X0.56/3X100/372=0.00164四、系统电抗等值电路：轧板变?0,001640.245710KV35KV五、简化系统电抗等值电路：X1=0.019957+0.11654=0.1365X2=0.0786+0.07438=0.15298X4=0.01188+0.2492=0.26108X5=0.00164+0.2457=0.24734X6=1.776+0.0114=1.7874则简化等值电路图如下：35KV梅塞尔0.2473410KV轧板变由于轧板变侧没同步机，故不考虑反馈。

182六、各元件电抗值换算：X4'=1.7874+0.26108-0.00771=2.0408所以，X4,,=2.0408+0.15298+2.0408X0.15298/0.1365=4.481Xr=0.1365+0.15298+0.1365X0.15298/2.0408=0.2997七、各电抗值换算成计算电抗：系统：Xjs=0.2997梅塞尔同步机：Xjs=4.481X10.7/0.95/100=0.5047八、短路电流计算：由系统向短路点d-1提供的短路电流为：Io=Ijz/X/=5.5/O.2997=18.3517KA梅塞尔同步机按Xjs=0.5047查表用插值法求得：b=2.1623,Io.2=L9375因此向短路点d-1提供的短路点电流为11=2.1623X10.7/0.95/1.732X10=1.4061KA因此短路点短路电流为：T=Io+I1=18.351+1.4O61=19.7571KAI（）,2=18.351+1.9375X10.7/0.95/1.732X10=18.351+1.26=19.611KA短路冲击电流为：Ic=1.52X19.7571=30.03KAic=2.55X19.757l=50.38KA短路容量为：S'=1.732X10.5X19.7571=359.3MVA短路阻抗为：X*=5.5/l9.7571=0.2784第二节四中央35KV最大运行方式下短路电流计算一、系统等值电抗图：

183系统二、各元件电抗标幺值计算：系统到35KV母线侧电抗标幺值：X*=0.1365-0.00771=0.12879梅塞尔到35KV母线侧电抗标幺值：X*=l.7874+0.26108=2.0485三、计算电抗的换算：系统：Xjs=0.12879梅塞尔同步机：Xjs=2.0485X10.7/0.95/100=0.2307四、短路电流计算：由系统向短路点d-2提供的短路电流为：Io=Ijz/X/=1.56O5/O.12879=12.1157KA梅塞尔同步机按Xjs=0.2307查表用插值法求得：b=4.8367,Io,2=3.526因此向短路点d-2提供的短路点电流为11=4.8367X10.7/0.95/1.732X35=0.8987KA因此短路点短路电流为：F'=10+11=12.1157+0.8987=13.0144KAIo.2=12.1157+3.526X10.7/0.95/1.732X35=12.1157+0.655l=12.7708KA短路冲击电流为：Ic=1.52X13.0144=19.78KAic=2.55X13.0144=33.19KA短路容量为：S”=I.732X37X13.0144=834.0IMVA短路阻抗为：X*=1.5605/13.0144=0.1199第三节梅塞尔10KV最大运行方式下短路电流计算

184一、系统等值电抗图：系统二、短路电流计算：系统到梅塞尔10KV母线电抗标幺值：X*=0.1365-0.00771+0.26108=0.38987将梅塞尔同步机的电抗换算成计算电抗：Xjs=1.7874X10.7/0.95/100=0.2013查表用插值法求得：12=5.4954,Io.2=3.8415因此向短路点d-3提供的短路点电流为11=5.4954X10.7/0.95/1.732X10=3.5736KA由系统向短路点d-3提供的短路电流为：Io=Ijz/X「=5.5/O.38987=14.1O73KA因此短路点短路电流为：F'=Io+11=14.1073+3.5736=17.6809KAIo.2=14.1073+3.8415X10.7/0.95/1.732X10=14.1073+2.4981=16.6054KA短路冲击电流为：Ic=1.52X17.6809=26.87KAic=2.55X17.6809=45.09KA短路容量为：S=1.732X10.5X17.6809=321.54MVA短路阻抗为：X*=5.5/17.6809=0.3111第四节轧板变10KV最大运行方式下短路电流计算一、系统等值电抗图：系统

185二、各元件电抗值换算：系统到35KV母线侧电抗标幺值：X*=0.1365-0.00771=0.12879梅塞尔到35KV母线侧电抗标幺值：X*=1,7874+0.26108=2.0485Xr=0.12879+0.24734+0.12879X0.24734/2.0485=0.408X4'=2.0485+0.24734+2.0485X0.24734/0.12879=6.23三、将各电抗值换算成计算电抗：系统：Xjs=0.408梅塞尔同步机：Xjs=6.23X10.7/0.95/100=0.7017四、短路电流计算：由系统向短路点d-4提供的短路电流为：Io=Ijz/Xi'=5.5/O.4O8=13.48O4KA梅塞尔同步机按Xjs=0.7017查表用插值法求得：12=1.5304,Io.2=L448因此向短路点d-4提供的短路点电流为11=1.5304X10.7/0.95/1.732X10=0.9952KA因此短路点短路电流为：「=Io+11=13.4804+0.9952=14.4756KAI（）,2=13.4804+1.448X10.7/0.95/1.732X10=13.4804+0.9416=14.422KA短路冲击电流为：Ic=1.52X14.4756=22KAic=2.55X14.4756=36.91KA短路容量为：S=1.732X10.5X14.4756=263.25MVA短路阻抗为：X*=5.5/14.4756=0.3799第五节四中央最小运行方式下短路电流计算最小运行方式为：2#主变带负荷，综合阻抗为：220KV母线：

186O.OO1837+jO.O9322,本计算以电抗为主。一、系统图如下：2#主变按Ud|.2=13.19%,Udi-3=22.99%Ud2.3=8.0%因此：X1=1/2X(0.1319+0.2299-0.08)=0.1409X2=1/2X(0.1306+0.08-0.2291)=-0.009X3=1/2X(0.2291+0.08-0.1306)=0.089于是电抗标幺值为：XBi=0.1409XI00/120=0.11742Xb2=-0.009X100/120=-0.0075Xb3=O.O89X100/120=0.07417二、简化等值电抗图：系统(0.09322Z0.11742>-0.0075.-X0.07417«0.078610KV梅塞尔10KV35KV<0,00164X0.2457轧板变10KV简化等值电抗图如下:X1=0.09322+0.11742=0.21064X2=0.0786+0.07417=0.15277X4=0.01188+0.2492=0.26108X5=0.00164+0.2457=0.24734

1870.15277d-110KV:0,26108—'——10KV梅塞尔0.2473410KV轧板变三、短路电流计算：1、系统到四中央10KV侧母线的电抗为X*=0,21604+0.15277=0.36881因此四中央10KV侧短路电流：I”=5.5/0.36881=14.9128KA2、系统到四中央35KV侧母线的电抗为X*=0,21604-0.0075=0.20854因此四中央35KV侧短路电流：I”=1.5605/0.20854=7.483KA3、系统到梅塞尔10KV侧母线电抗为X*=0,21604-0.0075+0.26108=0.46962因此梅塞尔10KV母线短路电流：亡=5.5/0.46962=11.7116KA4、系统到轧板变10KV母线侧电抗为X*=0.21604-0.0075+0.24734=0.45588因此轧板变10KV母线短路电流：I”=5.5/0.45588=12.0646KA第六章四中央远景短路电流计算第一节四中央10KV最大运行方式下短路电流计算

188一、计算依据：电业局提供四中央2005年度短路阻抗值，最大运行方式：0.00201+jO.019957,最小运行方式：0.001837+j0.09322,本计算以电抗为主。以1#、2#主变带全所负荷发电机并网为最大运行方式。二、最大运行方式系统图：三、各元件电抗计算：变压器电抗：1#主变按Udi.2=13.06%,Udi_3=22.91%,Ud2.3=8.0%因此：X1=1/2X(0.1306+0.2291-0.08)=0.13985X2=1/2X(0.1306+0.08-0,2291)=-0.00925X3=1/2X(0.2291+0.08-0,1306)=0.08925于是电抗标幺值为：XBi=0.13985X100/120=0.11654XB2=-0.00925X100/120=-0.00771Xb3=0.08925X100/120=0.074382#主变按Udi一2=13.19%,Udi一3=22.99%Ud2-3=8.0%因此：X1=1/2X(0.1319+0.2299-0.08)=0.1409X2=1/2X(0.1306+0.08-0.2291)=-0.009X3=1/2X(0.2291+0.08-0.1306)=0.089于是电抗标幺值为：XBi=0.1409X100/120=0.11742Xb2=-0.009X100/120=-0.0075Xb3=0.089X100/120=0.07417

189因此全部按1#主变计算。电抗器电抗：Xk=0.06548五高炉同步机：X=20%X100/40=0.5五高炉变压器：XB=8%X100/50=0.16焦烧变同步机：X=20%X100/（12.6/0.9）=1.4286焦烧变变压器：Xb=7.93%X100/31.5=0,2517电缆电抗标幺值:五高炉侧：Xdr=0.12X2X100/372=0.01753因此Xdl=O.O1753/2=O.OO877（6根电缆）焦烧变侧：Xdl=Xdr=0.12X3X100/372=0.0263（3根电缆）1#发电机侧：Xd=0.12X2X100/372=0.01753四、系统电抗等值电路：五、简化系统电抗等值电路：XI=0.019957+0.11654=0.1365X4=0.00877+0.16=0.16877X6=0.0263+0.2517=0.278X7=0.0114+0.2517=0.2631X8=0.0117+0.5=0.5117XI0=1.4286+0.0114=1.44XI1=1.776+0.0114=1.7874则简化等值电路图如下：X2=0.06548+0.07438=0.13986X5=0.234+0.01753=0.25153X9=0.952+0.2173=1.1693

190五百炉1#发电机♦衣虾梅塞尔六、各元件电抗值换算：将五高炉、1#发电机、焦烧变和梅塞尔的电抗折算到变压器中压侧，得:1#发电机五高炉焦烧变梅塞尔SY=l/0.68047+l/l.42083+1/1/1.718+1/2.0505-1/0.00771=1.4696+0.7038+0.5821+0.4877-129.7=-126.4575C=-0.00771X(-126.4575)=0.975X8,,=0.68047X0.975=0.6635X9”=L42083X0.975=1.3853X10,,=1.718X0.975=1.6751XI1”=2.0505X0.975=1.9992再将系统、五高炉、1#发电机、焦烧变和梅塞尔的电抗折算到四中央10KV侧，得：

191系然1#发电机五高炉焦烧变悔塞尔SY=1/X2+1/X8,,+1/X9,,+1/X1O,,+1/XH,,+1/X1=1/0.13986+1/0.6635+1/1.3853+1/1.6751+1/1.9992+1/0.1365=7.326+1.5072+0.7219+0.597+0.5002+7.15=17.8023C=XYXX2=l7.8023X0.13986=2.4898Xr=0.1365X2.4898=0.3399X8"'=0.6635X2.4898=1.652X9"'=1.3853X2.4898=3.4491X10,,,=1.6751X2.4898=4.1707XI1'”=1.9992X2.4898=4.9776七、简化等值电抗图：将各电抗换算成计算电抗：系统:Xjs=0.3399五高炉：Xjs=1.652X40/100=0.66081#发电机:Xjs=3.4491X15/100=0.5174焦烧变：Xjs=4.1707X12.6/0.9/100=0.5839梅塞尔：Xjs=4.9976X10.7/0.95/100=0.5629系统1#发电机五高炉焦烧变悔塞尔50,3399J0,5174J0.6608J0.5839J0.5629八、短路电流计算：由系统向短路点d-1提供的短路电流为：I（）=Ijz/X」=5.5/0.3399=16.1812KA五高炉同步机按Xj‘=0.6608查表用插值法求得：I尸1.6312,1。.2=1.5286（其中L为瞬态电流，Io.2为稳态电流），因此由五高炉向短路点提供的短路电流为：11=1.6312X40/1.732X10=3.7672KA；1#发电机按Xjs=0.5174查表用插值法求得：12=2.0421,Io.2=L7615,因此由1#发电机向短路点提供的短路电流为：b=2.0421X15/1.732X

19210.5=1.6843KA；焦烧变同步机按Xjs=0.5839查表用插值法求得：12=1.8567,Io.2=L7O69,因此由焦烧变向短路点提供的短路电流为：b=L8567X12.6/0.9/1.732X10=1.5008KA；梅塞尔同步机按Xjs=0.5629查表用插值法求得：12=1.9281,Io.2=L7615,因此由焦烧变向短路点提供的短路电流为：L=L9281X10.7/0.95/1.732X10=1.2538KA因此短路点d-1的短路电流为：r=i0+ii+12+13+14=16.1812+3.7672+1.6843+1.5008+1.2538=24.3873KAIo.2=16.1812+1.5286X40/1.732X10+1.7615X15/1.732X10.5+1.7069X12.6/0.9/1.732X10+1.7615X10.7/0.95/1.732X10=16.1812+3.5303+1.4529+1.3797+1.1455=23.6896KA短路冲击电流为：Ic=1.52X24.3873=37.07KAic=2.55X24.3873=62.19KA短路容量为：S'=1.732X10.5X24.3873=443.44MVA短路阻抗为：X*=5.5/24.3873=0.2311

193四中央10KV侧短路电流计算结果表短路点符号系统h.高炉1#发电机焦烧变梅塞尔总计四中央IOKV侧例路点d-1EX0.33991.6523.44914.17074.9976Xjs0.33990.66080.51740.58390.5629I*MZ2.942041.63122.04211.85671.9281I*2.942041.52861.76151.70691.7615S"Z(MVA)294.20468.5130.63]27.29422.802443.44r'z(KA)16.18123.76721.68431.50081.253824.3873KKA)16.18123.53031.45291.37971.145523.6896ich(KA)62.1877Ich(KA)37.0687第二节四中央10KVI段短路电流计算运行方式：四中央1#变带焦烧变、梅塞尔一、系统电抗图:

194系统二、各元件电抗值的换算：将焦烧变和梅塞尔的电抗值折算到变压器绕组中压侧，得:Xio=1.718-0.00771+1.718X(-0.00771)/2.0505=1.7038X,,=2.0505-0.00771+2.0505X(-0.00771)/1.718=2.0336再将系统、焦烧变和梅塞尔的电抗值折算到四中央10KV侧，得:SY=1/X1+1/X1O+1/X11+1/X2=1/0.1365+1/1.7038+1/2.0336+1/0.13986

195=7.326+0.5869+0.4917+7.15=15.5546C=XYXX5=15.5546X0.13986=2.1755Xr=0.1365X2.1755=0,297XIO^l.7038X2.1755=3.7066XIT=2.0336X2.1755=4.4306三、简化等值电抗图：将各电抗值换算成计算电抗，得：系统：Xjs=0.297焦烧变同步机：Xjs=3.7066X12.6/0.9/100=0.5189梅塞尔同步机：Xjs=4.4306X10.7/0.95/100=0.499四、短路电流计算：系统向短路点d-1提供的短路电流为：10=5.5/0.297=18.5185KA焦烧变同步机按Xjs=0.5189查表用插值法求得：L=2.0998,Io.2=1.89O6；因此向短路点d-1提供的短路电流为：11=2.0988X12.6/0.9/(1.732X10)=1.6965KA；梅塞尔同步机按Xjs=0.499查表用插值法求得：b=2.1879,Io.2=L967；因此向短路点d-1提供的短路电流为：I2=2.1879X(10.7/0.95)/(1.732X10)=1.4228KA因此，短路点的短路电流为：I"=IO+I1+I2=18.5185+1.6965+1.4228=21.6378KAIo.2=18.5185+1.8906X12.6/0.9/1.732X10+1.967X10.7/0.95/1.732X10=18.5185+1.5282+1.2791=21.3258KA

196短路冲击电流为：Ich=1.52X21.6378=32.89KAich=2.55X21.6378=55.18KA短路容量为：S=1.732X10.5X21.6378=393.51MVA短路阻抗为：X*=5.5/21.6378=0.2542第三节四中央10KVH段短路电流计算运行方式：四中央2#变带五高炉、1#发电机一、系统电抗图：2#主变的电抗值参照四中央10KVI段短路电流计算，得：Xl=0.11742+0.019957=0.1374X2=0.07417+0.07438=0.13965二、各元件电抗值的换算：将五高炉和1#发电机的电抗值折算到变压器绕组中压侧，得:

197-0.0075五高炉1#发电机五高炉1#发电机X8=0.68047-0.0075+0.68047X(-0.0075)/1.42083=0.6694X9=l.42083-0.0075+1.42083X(-0.0075)70.68047=1.398再将系统、五高炉和1#发电机的电抗值换算到四中央10KV侧，得:SY=1/X1+1/X8+1/X9+1/X2=1/0.1374+1/0.6694+1/1.398+1/0.13965=7.278+1.4939+0.7153+7.1607=16.6479C=SYXX5=16.6479X0.13965=2.3249Xr=0.1374X2.3249=0.3194X8'=0.6694X2.3249=1.5563X9'=l.398X2.3249=3.2502三、简化等值电抗图：将各电抗值换算成计算电抗，得：系统:Xjs=0.3194五高炉同步机：Xjs=1.5563X40/100=0.62251#发电机：Xjs=3.2502X15/100=0.4875

198四、短路电流计算：系统向短路点d-1提供的短路电流为：I0=5.5/0.3194=17.2198KA五高炉同步机按Xjs=0.6225查表用插值法求得：b=L7372,10.2=1.6133；因此向短路点d-1提供的短路电流为：11=1.7372X40/(1.732X10)=4.012KA；1#发电机按Xjs=0.4875查表用插值法求得：b=2.1685,Io.2=L8543；因此向短路点d-1提供的短路电流为：12=2.1685X15/(1.732X10.5)=1.7886KA因此，短路点的短路电流为：I''=IO+I1+I2=17.2198+4.012+1.7886=23.0304KAIo.2=17.2198+1.6133X40/1.732X10+1.8543X15/1.732X10.5=17.2198+3.7259+1.5294=22.475IKA短路冲击电流为：Ich=1.52X23.0304=35KA6=2.55X23.0304=58.73KA短路容量为：S=1.732X10.5X23.0304=418.84MVA短路阻抗为：X*=5.5/23.0304=0.2388第四节四中央35KVI段短路电流计算运行方式：1#主变带焦烧变和梅塞尔一、系统等值电抗图：

199二、各元件电抗值换算：将系统、焦烧变和梅塞尔的电抗折算到35KV侧，得：Xl=0.1365-0.00771=0.1288X2=l.44+0.278=1.718X3=1.7874+0.2631=2.0505三、简化等值电抗图：将各元件的电抗换算成计算电抗：系统:Xjs=0.1288焦烧变同步机：Xjs=1.718X12.6/0.9/100=0.2405梅塞尔同步机：Xjs=2.0505X10.7/0.95/100=0.231四、短路电流计算：系统向短路点d-2提供的短路电流为：Io=%/X「=1.56O5/O.1288=12.1157KA焦烧变同步机按Xjs=0.2405查表用插值法求得：L=4.6381,Io,2=3.4285,因此由焦烧变向短路点提供的短路电流为：Ii=4.6381X12.6/0.9/1.732X35=1.0712KA；梅塞尔同步机按Xjs=0.231查表用插值法求得：b=4.8306,Io2=3.523,

200因此由梅塞尔向短路点提供的短路电流为：b=4.8306X10.7/0.95/1.732X35=0.8975KA；因此短路点d-2的短路电流为：I”=Io+11+12=12.1157+1.0712+0.8975=14.0844KAIo.2=12.1157+3.4285X12.6/0.9/1.732X35+3.523X10.7/0.95/1.732X35=12.1157+0.7918+0.8823+0.6546=13.5621KA短路冲击电流为：Ic=1.52X14.0844=21.41KAic=2.55X14.0844=35.92KA短路容量为：S''=l.732X37X14.0844=902.58MVA短路阻抗为：X*=1.5605/14.0844=0.1108第五节四中央35KVII段短路电流计算运行方式：2#主变带五高炉和1#发电机一、系统等值电抗图：二、各元件电抗值换算：将系统、焦烧变和梅塞尔的电抗折算到35KV侧，得：Xl=0.1374-0.0075=0.1299X2=0.5117+0.16877=0.68047X3=0.25153+1.1693=1.42083三、简化等值电抗图：

201将各元件的电抗换算成计算电抗：系统：Xjs=0.1299五高炉同步机：Xjs=0.68047X40/100=0.27221#发电机：Xjs=1.42083X15/100=0.2131四、短路电流计算：系统向短路点d-2提供的短路电流为：Io=%/X」=1.5605/0.1299=12.0131KA五高炉同步机按Xj‘=0.2722查表用插值法求得：b=4.1088,Io.2=3.1572,因此由五高炉向短路点提供的短路电流为：1尸4.1088X40/1.732X35=2.7112KA；1#发电机按Xjs=0.2131查表用插值法求得：b=5.1084,Io.2=3.5657,因此由1#发电机向短路点提供的短路电流为：12=5.1084X15/1.732X35=1.264KA；因此短路点d-2的短路电流为：I”=Io+Ii+12=12.0131+2.7112+1.264=15.9883KAIo.2=12.0131+3.1572X40/1.732X35+3.5657X15/1.732X35=12.0131+2.0833+0.8823=14.9787KA短路冲击电流为:Ic=1.52X15.9883=24.3KAic=2.55X15.9883=40.77KA短路容量为：S”=I.732X37X15.9883=1024.59MVA短路阻抗为：X*=l.5605/15.9883=0.0976

202第六节五高炉10KVII段短路电流计算运行方式：2#主变带五高炉和1#发电机一、系统等值电抗图：二、各元件电抗值换算：将系统和1#发电机的电抗折算到35KV侧，得：XI=0.1374-0.0075=0.1299X3=0.25153+1.1693=1.42083再将系统和1#发电机的电抗折算到五高炉10KV侧，得:xr=o.l299+0.16877+0.1299X0.16877/1.42083=0.3141X3'=l.42083+0.16877+1.42083X0.16877/0.1299=3.4356三、简化等值电抗图：将各元件的电抗换算成计算电抗：系统:Xjs=0.3141五高炉同步机：Xjs=0.5117X40/100=0.20471#发电机：Xjs=3.4356X15/100=0.5153-5五宣炉1*^：电机

203四、短路电流计算：系统向短路点d-3提供的短路电流为：Io=%/X「=5.5/O.3141=17.51O3KA五高炉同步机按Xj‘=0.2047查表用插值法求得：b=5.4153,Io.2=3.8O36,因此由五高炉向短路点提供的短路电流为：Ii=5.4153X40/1.732X10=12.5065KA；1#发电机按Xjs=0.5153查表用插值法求得：E=2.0583,Io.2=L7736,因此由1#发电机向短路点提供的短路电流为：12=2.0583X15/1.732X10.5=1.6977KA；因此短路点d-3的短路电流为：I"=Io+Il+12=17.5103+12.5065+1.6977=31.7145KAIo.2=17.5103+3.8036X40/1.732X10+1.7736X15/1.732X10.5=17.5103+8.7843+1.4629=27.7575KA短路冲击电流为：Ic=1.52X31.7145=48.27KAic=2.55X31.7145=80.98KA

204短路容量为：S”=L732X10.5X31.7145=577.54MVA短路阻抗为：X*=5.5/31.7145=0.1732第七节二中央10KV0段短路电流计算运行方式：2#主变带五高炉和1#发电机一、系统等值电抗图：二、各元件电抗值换算：将系统和五高炉的电抗折算到35KV侧，得：XI=0.1374-0.0075=0.1299X2=0.5117+16877=0.68047再将系统和五高炉的电抗折算到五高炉10KV侧，得:系统五高炉Xr=0.1299+0.25153+0.1299X0.25153/0.68047=0.4294

205X2,=0.68047+0.25153+0.68047X0.25153/0.1299=2.2496三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.4294五高炉：Xjs=2.2496X40/100=0.89981#发电机：Xjs=1.1693X15/100=0.254四、短路电流计算：系统向短路点d-4提供的短路电流为：Io=Ijz/X「=5.5/O.4294=12.8O86KA五高炉同步机按Xjs=0.8998查表用插值法求得：12=1.1823,Io.2=11552,因此由五高炉向短路点提供的短路电流为：h=l.1823X40/1.732X10=2.7305KA；1#发电机按Xj‘=0.254查表用插值法求得：b=4.2824,10.2=3.16,因此由1#发电机向短路点提供的短路电流为：I2=4.2824X15/1.732X10.5=3.5322KA；因此短路点d-4的短路电流为：I"=Io+Ii+12=12.8086+2.7305+3.5322=19.0713KAIo.2=12.8086+1.1552X40/1.732X10+3.16X15/1.732X10.5=12.8086+2.6679+2.6064=18.0829KA短路冲击电流为：Ic=1.52XI9.0713=28.99KAic=2.55X19.0713=48.63KA短路容量为：S,=1.732X10.5X19.0713=346.83MVA

206短路阻抗为：X*=5.5/19.0713=0.2884第八节焦烧变10KVII段短路电流计算运行方式：1#主变带焦烧变和梅塞尔一、系统等值电抗图：二、各元件电抗值换算：将系统和梅塞尔的电抗折算到35KV侧，得：Xl=0.1365-0.00771=0.1288XI1=1.7874+0.2631=2.0505再将系统和梅塞尔的电抗折算到焦烧变10KV侧，得:Xr=O.1288+0.278+0.1288X0.278/2.0505=0.4243X1「=2.0505+0.278+2.0505X0.278/0.1288=6.7543

207三、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.4243梅塞尔同步机：Xjs=6.7543X10.7/0.95/100=0.7607焦烧变同步机：Xjs=1.44X12.6/0.9/100=0.2016系蜿焦烧变梅塞尔四、短路电流计算：系统向短路点d-5提供的短路电流为：Io=%/X「=5.5/O.4243=12.9625KA梅塞尔同步机按Xjs=0.7607查表用插值法求得：12=1.4083,Io.2=L3465,因此由梅塞尔向短路点提供的短路电流为：11=1.4083X10.7/0.95/1.732X10=0.9158KA；焦烧变同步机按Xj‘=0.2016查表用插值法求得：b=54883,10,2=3.8382,因此由焦烧变向短路点提供的短路电流为：L=5.4883X12.6/0.9/1.732X10=4.4363KA；因此短路点d-5的短路电流为：r=io+ii+12=12.9625+0.9158+4.4363=18.3146KAIo.2=12.9625+1.3465X10.7/0.95/1.732X10+3.8382X12.6/0.9/1.732X10=12.9625+0.8756+3.1025=16.9406KA短路冲击电流为：Ic=1.52X18.3146=27.84KAic=2.55X18.3146=46.7KA

208短路容量为：S=1.732X10.5X18.3146=333.07MVA短路阻抗为：X*=5.5/18.3146=0.3003第九节梅塞尔10KV0段短路电流计算运行方式：1#主变带焦烧变和梅塞尔一、系统等值电抗图：二、各元件电抗值换算：将系统和焦烧变的电抗折算到35KV侧，得：XI=0.1365-0.00771=0,1288XI0=l.44+0.278=1.718再将系统和焦烧变的电抗折算到梅塞尔10KV侧，得:系统焦烧变系统焦烧变JCFCiX10=0.1288+0.2631+0.1288X0.631/1.718=0.4116X10=1.718+0.2631+1.718X0.2631/0.1288=5.4905

209三、简化等值电抗图：将各电抗换算成计算电抗：系统:Xjs=0.4116梅塞尔同步机：Xjs=1.7874X10.7/0.95/100=0.2013焦烧变同步机：Xjs=5.4905X12.6/0.9/100=0.7687系线焦烧变梅塞尔四、短路电流计算：系统向短路点d-6提供的短路电流为：Io=IjJX/=5.5/0.4116=13.3625KA梅塞尔同步机按Xjs=0.2013查表用插值法求得：b=5.4954,Io,2=3.8415,因此由梅塞尔向短路点提供的短路电流为：h=5.4954X10.7/0.95/1.732X10=3.5736KA；焦烧变同步机按Xjs=0.7687查表用插值法求得：b=L3936,Io.2=L3342,因此由焦烧变向短路点提供的短路电流为：b=L3936X12.6/0.9/1.732X10=1.1265KA；因此短路点d-6的短路电流为：I”=Io+Ii+12=13.3625+3.5736+1.1265=18.0626KA10.2=13.3625+3.8415X10.7/0.95/1.732X10+1.3342X12.6/0.9/1.732X10=13.3625+2.4981+1.0785=16.939IKA短路冲击电流为：Ic=1.52X18.0626=27.46KAic=2.55X18.0626=46.06KA短路容量为：

210S=1.732X10.5X18.0626=328.49MVA短路阻抗为：X*=5.5/18.0626=0.3045第十节轧板变10KV最大运行方式下短路电流计算轧板变最大运行方式：轧板变2艇行，即：四中央2#主变带五高炉、1#发电机一、各元件电抗值换算：将系统、五高炉和1#发电机的电抗折算到35KV侧，再将系统、五高炉和1#发电机的电抗折算到轧板变10KV侧,SY=1/X12+1/X1+1/X8+1/X9=1/0.24734+1/0.1299+1/0.68047++1/1.42083=4.043+7.6982+1.4696+0.7038=13.9146C=13.9146X0.24734=3.4416Xr=0.1299X3.4416=0.4471X8'=0.68047X3.4416=2.3419X9'=l.42083X3.4416=4.8899二、简化等值电抗图：将各电抗换算成计算电抗：系统：Xjs=0.4471五高炉：Xjs=2.3419X40/100=0.93681#发电机：Xjs=4.8899X15/100=0.7335本线五育炉1#炭电机

211三、短路电流计算：系统向短路点d-7提供的短路电流为：Io=Ijz/XJ=5.5/O.4471=12.3O15KA五高炉同步机按Xjs=0.9368查表用插值法求得：b=L1349,Io.2=LU38,因此由五高炉向短路点提供的短路电流为：11=1.1349X40/1.732X10=2.621KA；1#发电机按Xjs=0.7335查表用插值法求得：b=L4237,Io.2=L28O4,因此由1#发电机向短路点提供的短路电流为：b=L4237义15/1.732义10.5=1.1743KA；因此短路点d-6的短路电流为：r=io+ii+12=12.3015+2.621+1.1743=16.0968KAIo.2=12.3015+1.1138X40/1.732X10+1.2804X15/1.732X10.5=12.3015+2.5723+1.0561=15.9299KA短路冲击电流为：Ic=1.52X16.0968=24.47KAic=2.55X16.0968=41.05KA短路容量为：S,=1.732X10.5X16.0968=292.74MVA短路阻抗为：X*=5.5/16.0968=0.3417