供电系统参数计算

1、供电系统参数计算一、系统参数（根据上级供电部门提供的系统参数）.110KV至000000地面变电所10KV母线运行小方式：X'min=0.43042运行大方式：X'max=0.23366二、基准值取基准电压：Uc=10.5KV基准容量：Sd=100MVA=100000KVA基准电流：Id=Sd/（UCX，3）=100000KVA/（10.5KVX1.732）=5498.7AM.499KA（计算10.5KV线路）三、标幺值的计算短路电流计算采用标幺值计算，基准值是一个比较标准，那么基准电抗就可以用下式来决定Xd=Ucl（。）3IdSd供电系统各主要元件的电抗标幺值计算（一）电力系

2、统电抗标幺值：Xs=3Sks式中：X*s电力系统电抗标幺值；Sd一基准容量；Sks电力系统短路容量；（二）电力变压器的电抗标幺值：X-芷100100SnUk%变压器短路电压百分数；Sn变压器额定容量；（三）电缆线路的电抗标幺值：Xe=XL'yUr2C（四）X一架空线路单位长度电抗值，Q/km注：系统元件本身的电抗为X,电阻为R,当1X>R时，只需要计算元3件的电抗值；当短路回路中各元件的总电阻FU>【Xw时，同时考虑总电3阻和总电抗，弁用Zw=VwxFr2的值进行计算。各种架空线路、电缆单位长度的电阻、电抗的标幺值导线及电缆型号电阻（标幺值）（Q/km）电抗（标幺值）（Q/

3、km）YJV22-8.7/103X185（铜）0.090.0726YJV22-8.7/103X150（铜）0.110.0726YJV22-8.7/103X120（铜）0.140.0726YJW-8.7/103X95（铜）0.170.0726YJW-8.7/103X70（铜）0.240.0726YJW-8.7/103X50（铜）0.340.0726YJW-8.7/103X35（铜）0.480.0726LGJ-1850.170.305LGJ-1500.210.309LGJ1200.270.315LGJ-950.330.32LGJ-500.650.345LJ-500.640.345LJ-350.92

4、0.356）Di点（地面变电所10KV母线）000000线II同：LGJ-185-5.8km架空线路的电抗标幺值：Xi=xl2uc2X一架空线路单位长度电抗值，Q/kmL一架空线路长度，km运行小方式：X'min=0.43042运行大方式：Xmax=0.23366Xi=XL=0.305X5.8XJ2=1.6045310.52Xw(D1min)=Xmin+X=0.43042+1.60453=2.03496Xs(D1max=Xmax+X=0.23366+1.60453=1.83819ID1(3)min=Id/Xw(D1min)=5.499/2.03496q.70KAID1min=，3/2x

5、ID1min=0.866X2.7电34KAID1(3)maX=Id/Xw(D1max)=5.499/1.83819q.99KASD1min=Sd/Xw(D1min)=100/2.03496超9.14MVASD1MA=Sd/Xw(D1max)=100/1.83819M4.40MVA注：X1：000000II同架空线路电抗标幺值L:架空线路长度Xw(D1min)：D1点最小三相短路电抗标幺值Xw(D1max)：D1点最大三相短路电抗标幺值ID1min：D1点最小三相短路电流值ID1maSDl点最大三相短路电流值ID1min：Dl点最小两相短路电流值SD1min：Dl点的最小三相短路容量SDlmaX

6、Dl点的最大三相短路容量二）D点（地面10KV变电所至低压室变压器母线）007、012出线电缆：YJW-8.7/103X35（铜）0.05kmR1=0.05X0.48=0.024Xi=0.05X0.0726=0.00363Zi=0.02420.003632=0.0005760.0000132=0.0243变压器：S11-100/10/0.4短路阻抗：U=4.5%变压器的电抗标幺值：为="xSd=4.5%/100x100000/（100X1000）100100Sn=4.5X1=4.5小运行方式X'min=Xw（D1min）=2.03496（D点最小三相短路电抗标幺值）Zmin=

7、X'min+Z1+K=2.03496+0.0243+4.5=6.55926注：（Zmin：D2点最小三相短路电抗标幺值）fImin吟XId/Zmin=4.762/6.55926273KA大运行方式X'max=%（D1max=1.83819（D点最大三相短路电抗标幺值）ZmakX'max+Z1+XT=1.83819+0.0243+4.56.36Zmax（。点最大三相短路电抗标幺值）Ima"1d2=5.499/6.36匐.86KAZmaxSmax=Sd=100/6.3675.72MVAZmax三）Q点（地面10KV变电所至瓦斯泵高压电机）006、011出线电缆：Y

8、JV22-8.7/103X35（铜）0.18kmR=0.18X0.48=0.0864Xi=0.18X0.0726=0.01307Zi=0.086420.013072=0.007460.0001708=0.08637小运行方式X'min=Xw（D1min）=2.03496（D点最小三相短路电抗标幺值）Zmin=X'min+Z1=2.03496+0.08637=2.12133（Zmin：D3点最小三相短路电抗标幺值）Imin=gXId/Zmin=4.762/2.12133电25KA大运行方式Xmax=Xs（D1max=1.83819（D点最大二相短路电幺值）Zmax=X'm

9、ax+Z1=1.83819+0.08637=1.92456Zmax（D3点最大三相短路电抗标幺值）Imax=5.499/1.92456=2.86KAZmaxSmax=-SL=100/1.92456咫1.96MVAZmax四）D4点（地面10KV变电所至高压无功补偿器）005、014出线电缆：YJV22-8.7/103X35（铜）0.02kmR=0.02X0.48=0.0096Xi=0.02X0.0726=0.001452Zi=0.009620.0014522=0.000092160.0000021=0.00971小运行方式X'min=Xw（D1min）=2.03496（D点最小三相短路

10、电抗标幺值）Zmin=X'min+Z1=2.03496+0.00971=2.04467（Zmin：D4点最小三相短路电抗标幺值）I（2）min=31XId/Zmin=4.762/2.04467电33KA大运行方式Xmax=Xs（D1max=1.83819（D点最大二相短路电幺值）Zmax=X'max+Z1=1.83819+0.00971=1.8479Zmax（D点最大三相短路电抗标幺值）Imax=5.499/1.8479或.98KAZmaxSmakSd=100/1.8479咫5.12MVAZmax五）6点（地面10KV变电所至主通风机房进线柜）013、018出线电缆：YJV22

11、-8.7/103X35（铜）0.15kmR=0.15X0.48=0.072Xi=0.15X0.0726=0.01089lZ1=0.07220.010892=0.0051840.00011859=0.12678小运行方式：X'min=Xw（D1min）=2.03496（D点最小三相短路电抗标幺值）Zmin=X'min+Zi=2.03496+0.12678=2.16174（Zmin：D5点最小三相短路电抗标幺值）I（2）min=31XId/Zmin=4.762/2.16174电21KA大运行方式：X'max=%（D1max=1.83819（D点最大三相短路电抗标幺值）Zma

12、x=X'max+Z1=1.83819+0.12678=1.96497Zmax（点最大三相短路电抗标幺值）Imax=5.499/1.96497双.80KAZmaxSmaX=L=100/1.96497M0.89MVAZmax六）D6点（主通风机房风机反转柜至主通风机高压电机）1#反转柜（1AH）、2#反转柜（2AH）出线电缆：YJV-8.7/103X35（铜）0.04kmR=0.04X0.48=0.0192Xi=0.04X0.0726=0.0029Zi=0.019220.00292=0.0003690.0000084=0.0194小运行方式X'min=Xw（D1min）=2.034

13、96（D点最小三相短路电抗标幺值）Zmin=X'min+Z1=2.03496+0.0194=2.05436（Zmin：D6点最小三相短路电抗标幺值）I（2）min=XId/Zmin=4.762/2.05436电32KA大运行方式X'max=%（D1max=1.83819（D点最大三相短路电抗标幺值）Zmax=X'max+Zi=1.83819+0.0194=1.85759Zmax（点最大三相短路电抗标幺值）I（3）max=Id=5.499/1.85759双.96KAZmaxSmaX=100/1.85759咫3.83MVAZmax七）D7点（地面10KV变电所至采区10KV

14、变电所母线）009、008出线电缆：YJU2-8.7/103X50（铜）0.5kmR=0.34X0.5=0.17X=0.0726X0.5=0.0363'Z1=0.1720.03632=.0.02890.00132=0.03022=0.1738小运行方式：X'min=Xw（D1min）=2.03496（D点最小三相短路电抗标幺值）Zmin=X'min+Z1=2.03496+0.1738=2.20876（Zmin：D点最小三相短路电抗标幺值）Imin/XId/Zmin=4.762/2.20876电16KA大运行方式：X'max=K（D1max=1.83819（D点最

15、大三相短路电抗标幺值）（D点最大三相短路电抗标幺值）Zmax=X'max+Z1=1.83819+0.1738=2.01199Zmax（。点最大三相短路电抗标幺值）Imak1d2=5.499/2.01199双.73KAZmaxSmax=Sd=100/2.01199超9.70MVAZmax八）D8点（采区10KV变电所至1、2转用变压器母线）5#、6#高爆出线电缆：YJV22-8.73X35（铜）0.02kmR=0.02X0.48=0.0096Xi=0.02X0.0726=0.001452Z1=0.009620.0014522=.0.000092160.0000021=0.00971变压器

16、：KBSG-200/10短路阻抗：U=4.12%变压器的电抗标幺值：Xr="xSd=4.12%/100x100000/（100X200）100100Sn=4.12X5=20.6小运行方式X'min=Xw（D7min）=2.20876（D点最小三相短路电抗标幺值）Zmin=X'min+Z1+XT=2.20876+0.00971+20.6=22.81847（Zmin：D8点最小三相短路电抗标幺值）I（2）min=31XId/Zmin=4.762/22.81847221KA大运行方式X'max=ZD7ma=2.01199（D点最大三相短路电抗标幺值）ZmakX

17、9;max+Z1+Xt=2.01199+0.00971+20.6=22.6217Zmax（D8点最大三相短路电抗标幺值）I一标1d=5.499/22.6217用.24KAZmax3毋Sd=100/22.6217M.42MVAZmax九）D9点（采区10KV变电所至3#动力变压器母线）8#高爆出线电缆：YJV22-8.73X35（铜）0.02kmR=0.02X0.48=0.0096Xi=0.02X0.0726=0.001452Z1=0.009620.0014522=0.000092160.0000021=0.00971变压器：KBSG-500/10短路阻抗：U=4.30%变压器的电抗标幺值：片=

18、叱*Sd=4.3%/100X100000/（100X500）100100Sn=4.3X2=8.6小运行方式X'min=Xw（D7min）=2.20876（D点最小三相短路电抗标幺值）Zmin=X'min+Z1+XT=2.20876+0.00971+8.6=10.81847（Zmin：D9点最小三相短路电抗标幺值）I（2）min=31XId/Zmin=4.762/10.81847244KA大运行方式X'max=ZD7ma=2.01199（D点最大三相短路电抗标幺值）ZmakX'max+Z1+Xt=2.01199+0.00971+8.6=10.6217Zmax（D9

19、点最大三相短路电抗标幺值）I一标1d=5.499/10.6217用.52KAZmax3毋Sd=100/10.6217咫.41MVAZmax十）Dw点（采区10KV变电所至000000石门联络巷配电点动力变压器母线）9#高爆出线电缆：YJV22-8.73X35（铜）0.12kmR=0.12X0.48=0.0576Xi=0.12X0.0726=0.0087乙=0.057620.00872=0.003320.00007569=0.05827变压器：KBSG-630/10短路阻抗：U=4%变压器的电抗标幺值：Xt=VXSd=4%/100X100000/（100X630）100100Sn=4X1.587

20、=6.35小运行方式X'min=Xw（D7min）=2.20876（D点最小三相短路电抗标幺值）Zmin=X'min+Z1+XT=2.20876+0.05827+6.35=8.61703（Zmin：Dl1点最小三相短路电抗标幺值）I（2）min=31XId/Zmin=4.762/8.61703255KA大运行方式X'max=ZD7ma=2.01199（D点最大三相短路电抗标幺值）ZmakX'max+Z1+Xt=2.01199+0.05827+6.35=8.41486Zmax（D1点最大三相短路电抗标幺值）I41d=5.499/8.41486用.65KAZmax3

21、毋Sd=100/8.418671.88MVAZmax1一）d点（采区10KV变电所至000000石门配电点动力变压器母线）7#高爆出线电缆：YJV22-8.73X35（铜）0.8kmR=0.8X0.48=0.384Xi=0.8X0.0726=0.058Zi=0.38420.0582=0.14750.00336=0.15087变压器：KBSG-630/10短路阻抗：U=4%变压器的电抗标幺值：Xt=VXSd=4%/100X100000/（100X630）100100Sn=4X1.587=6.35小运行方式X'min=Xw（D7min）=2.20876（D点最小三相短路电抗标幺值）Zmin

22、=X'min+Z1+XT=2.20876+0.15087+6.35=8.70963（Zmin：D11点最小三相短路电抗标幺值）Imin柠XId/Zmin=4.762/8.70963255KA大运行方式X'max=ZD7ma=2.01199（D点最大三相短路电抗标幺值）ZmakX'max+Z1+Xt=2.01199+0.15087+6.35=8.51286Zmax（D1点最大三相短路电抗标幺值）I一标1d=5.499/8.51286用.65KAZmax3毋Sd=100/8.5128671.75MVAZmax十二）Di2点（采区10KV变电所至中央10KV变电所母线）3#、

23、4#高爆出线电缆：YJV22-8.73X50（铜）0.55kmR=0.55X0.34=0.187Xi=0.55X0.0726=0.04Z1=0.18720.0402=0.0349690.0016=0.19小运行方式X'min=Xw（D7min）=2.20876（D点最小三相短路电抗标幺值）Zmin=X'min+Z1=2.20876+0.19=2.39876（Zmin：Dl2点最小三相短路电抗标幺值）Imin=XId/Zmin=4.762/2.39876599KA大运行方式X'max=ZD7ma=2.01199（D点最大三相短路电抗标幺值）ZmakX'max+Z1

24、=2.01199+0.19=2.20199Zmax（D2点最大三相短路电抗标幺值）Imax=5.499/2.20199双.50KAZmaxSmax=-S=100/2.20199超5.41MVAZmax十三）d点（中央10KV变电所至3#、4#专用变压器母线）5、6#高爆出线电缆：YJV22-8.73X35（铜）0.02kmR=0.02X0.48=0.0096Xi=0.02X0.0726=0.001452Zi=0.009620.0014522=,0.0.000092160.0000021=0.00971变压器：KBSG-315/10短路阻抗：U=4.30%变压器的电抗标幺值：片=止*Sd=4.3

25、%/100X100000/（100X315）100100Sn=4.3X3.175=13.65小运行方式X'min=ZD12min=2.39876（D2点最小三相短路电抗标幺值）Zmin=X'min+Z1+XT=2.39876+0.00971+13.65=16.05847（Zmin：D3点最小三相短路电抗标幺值）Imin=当XId/Zmin=4.762/16.058470.30KA大运行方式X'max=ZD12ma=2.20199（Dl2点最大三相短路电抗标幺值）ZmaX=X'max+Z1+Xt=2.20199+0.00971+13.65=15.8617Zmax（

26、口3点最大三相短路电抗标幺值）Imax=5.499/15.8617用.35KAZmaxSmaX=-SL=100/15.8617冶30MVAZmax十四）d点（中央10KV变电所至1#、00000石门联络巷配电点动力变压器母线）3#高爆出线电缆：YJV22-8.73X35（铜）0.07kmR=0.07X0.48=0.0336Xi=0.07X0.0726=0.0051Zi=。033620.00512=0.0011290.000026=0.033985变压器：KBSG-500/10两台短路阻抗：U=4.30%变压器的电抗标幺值：XT=Uk2iXSd=4.3%/100x100000/（100X5001

27、00100SnX2）=4.3X1=4.3小运行方式X'min=ZD12min=2.39876（口2点最小三相短路电抗标幺值）Zmin=X'min+Z1+XT=2.39876+0.033985+4.3=6.732745（Zmin：d点最小三相短路电抗标幺值）I（2）min=31XId/Zmin=4.762/6.732745271KA大运行方式X'max=ZD12ma=2.20199（Dl2点最大三相短路电抗标幺值）Zmax=X'max+Z1+Xt=2.20199+0.033985+4.3=6.535975Zmax（D4点最大三相短路电抗标幺值）I（3）max=5.

28、499/6.535975284KAZmaxSmax=100/6.53597575.30MVAZmax十五）d点（中央10KV变电所至2#动力变压器母线）4#高爆出线电缆：YJV22-8.73X35（铜）0.02kmR=0.02X0.48=0.0096Xi=0.02X0.0726=0.001452Zi=0.009620.0014522=0.000092160.0000021=0.00971变压器：KBSG-500/10短路阻抗：U=4.30%变压器的电抗标幺值：片=乜三xSd=4.3%/100x100000/（100X500）100100Sn=4.3X2=8.6小运行方式X'min=ZD

29、12min=2.39876（口2点最小三相短路电抗标幺值）Zmin=X'min+Z1+XT=2.39876+0.00971+8.6=11.00847（Zmin：口5点最小三相短路电抗标幺值）I（2）min=-XId/Zmin=4.762/11.00847244KA大运行方式X'max=ZD12ma=2.20199（Dl2点最大三相短路电抗标幺值）Zmax=X'max+Z1+Xt=2.20199+0.00971+8.6=10.8117Zmax（D5点最大三相短路电抗标幺值）Imax=5.499/10.8117=0.51KAZmaxSmax=Sd=100/10.8117咫.

30、25MVAZmax十六）d点（中央10KV变电所至16区段10KV变电所母线）1#、6#高爆出线电缆：YJV22-8.73X50（铜）0.4kmR=0.4X0.34=0.136Xi=0.4X0.0726=0.029Zi=0.13620.0292=0.0184960.000841=0.139小运行方式X'min=ZD12min=2.39876（D2点最小三相短路电抗标幺值）Zmin=X'min+Z1=2.39876+0.139=2.53776（Zmin：口6点最小三相短路电抗标幺值）Imin=2_XId/Zmin=4.762/2.53776588KA大运行方式X'max=

31、ZD12ma=2.20199（Dl2点最大三相短路电抗标幺值）ZmaX=X'max+Z1=2.20199+0.139=2.34099Zmax（D6点最大三相短路电抗标幺值）Imax=5.499/2.34099双.35KAZmaxSmaX=L=100/2.34099超2.72MVAZmax十七）017点（16区段变电所至1、2#变压器母线）3#、4#高爆出线电缆：YJV22-8.73X35（铜）0.02kmR=0.02X0.48=0.0096X1=0.02X0.0726=0.001452Z1=0.009620.0014522=,0.000092160.0000021=0.00971变压器

32、：KBSG-500/10短路阻抗：U=4.30%变压器的电抗标幺值：Xt=3xSd=4.3%/100x100000/（100X500）100100Sn=4.3X2=8.6小运行方式X'min=Z）16min=2.53776（口6点最小三相短路电抗标幺值）Zmin=X'min+Z1+K=2.53776+0.00971+8.6=11.14747（Zmin：%点最小三相短路电抗标幺值）Imin=（XId/Zmin=4.762/11.14747243KA大运行方式X'max=ZD16ma=2.34099（口6点最大三相短路电抗标幺值）Zmax=X'max+Z1+Xt=2

33、.34099+0.00971+8.6=10.9507Zmax（D7点最大三相短路电抗标幺值）Imax=5.499/10.9507用.50KAZmaxSmakSd=100/10.9507213MVAZmax十八）D18点（00采区10KV至00采区I回10KV母线）00采区地面变电所至00采区I回10KV母线JKLYJ-50-1.1kmX'min=%（D1min）=2.03496（D点000000架空线最小三相短路电抗标幺值）X'max=%（D1max=1.83819（D点000000架空线最大三相短路电抗标幺值）X=xL-S=0.35X1.1X100/10.52=0.35UC1

34、2Xw（D18min）=Xmin+X=2.03496+0.35=2.38496Xw(D18max=Xma+X=1.83819+0.35=2.18819ID1(3)min=Id/Xw(D18min)=5.499/2.38496或.31KAID1(3)maX=Id/Xw(D18max)=5.499/2.18819或.51KAID1(2)min=0.866XID1min=0.866X2.312.00KASD18min=Sd/Xz(D18min)=100/2.38496M1.93MVASD18ma=S/Xw(D18max=100/2.18819M5.70MVA注：X:00采区变电所至00采区I回架空线

35、路电抗标幺值x:架空线路单位长度电抗值(当U=310KV时，x=0.35Q/km；UN=35220KV时，x=0.4。/km)L:架空线路长度Xw(D18max)：D18点最大三相短路电抗标幺值Xw(D18min):D18点最小三相短路电抗标幺值Id'max：D18点最大三相短路电流值ID，min:D18点最小三相短路电流值IDi2)minQ18点最小两相短路电流值SD1maxD18点的最大三相短路容量SD1min:D18点的最小三相短路容量十九)d点(00采区10KV至1#动力变压器母线)3#高爆出线电缆：YJU2-8.7/103X35(铜)0.02kmR=0.02X0.48=0.0

36、096Xi=0.02X0.0726=0.001452Zi=0.009620.0014522=.0.0.000092160.0000021=0.00971变压器：S11-1250/10/0.4短路阻抗：U=4.5%变压器的电抗标幺值：为=芷XSd=4.5%/100X100000/(100X1000)100100Sn=4.5X1=4.5小运行方式：Xmin=Xs(D18min)=2.38496(D8点最小三相短路电抗标幺值)Zmin=X'min+Z1+Xr=2.38496+0.00971+4.5=6.89467I(2)min=31XId/Zmin=0.866X5.499/6.89467匐.69KA大运行方式：Xmax=Xs(D18max)=2.18819(D18点最大二相fel路电抗击K幺Zma尸X'max+Z1+XT=2.18819+0.00971+4.5=6.6979Imax=Id2=5.499/6.69790.82KAZmaxSma广二二100/6.697974.93MVAZmax二十)D20点(00采区10KV至3#动力变压器母线)7#高爆出线电缆：YJ上78.7/103X35(铜)0.02kmR=0.02X0.48=0.0096X=0.02X0.0726=0.001452IZ1=0.009620.0014522=0.0.000092