高压短路电流计算书
工程名:
计算者:
计算时间:
参考标准:《导体和电器选择
设计
领导形象设计圆作业设计ao工艺污水处理厂设计附属工程施工组织设计清扫机器人结构设计
技术规程》,DL/T 5222-2005;
《电力工程电气设计手册》,电气一次部分;
《电力系统暂态
分析
定性数据统计分析pdf销售业绩分析模板建筑结构震害分析销售进度分析表京东商城竞争战略分析
》;
《工业与民用配电设计手册》,第三版;
已知条件
计算算法:节点导纳法
基准容量:Sj=100MVA
考虑电动机反馈电流
平均倍数 = 6
冲击系数 = 1.5
1、短路点##1
1.1对称短路计算(三相短路)
短路点平均电压Uj = 37.000 kV
短路点基准电流Ij = Sj/(√3Uj) = 100.000/(√3×37.000) = 1.560 kA
1.1.1 ##1短路点系统C1分支
分支名称:系统C1
分支电抗标幺值:
正序X1 = 0.0100
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×37.000×0.010) = 156.041(KA)
0.01秒短路电流有效值:
I0.01= I" = 156.041(KA)
0.1秒短路电流有效值:
I0.1= I" = 156.041(KA)
0.2秒短路电流有效值:
I0.2= I" = 156.041(KA)
0.4秒短路电流有效值:
I0.4= I" = 156.041(KA)
0.6秒短路电流有效值:
I0.6= I" = 156.041(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×156.041 = 397.215(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 156.041√[1+2×(1.800-1)2] = 235.616(KA)
起始短路容量:
S" = √3*Uj*I" = √3×37.000×156.041 = 10000.0(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 156.041 = 156.04(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 156.041 = 156.04(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 156.0412+10×156.0412+156.0412×0.5/12 = 12174.34(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 156.041 = 156.04(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 156.041 = 156.04(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 156.0412+10×156.0412+156.0412×0.5/12 = 97394.69(kA2·S)
1.1.2 ##1短路点系统C2分支
分支名称:系统C2
分支电抗标幺值:
正序X1 = 0.1833
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×37.000×0.183) = 8.512(KA)
0.01秒短路电流有效值:
I0.01= I" = 8.512(KA)
0.1秒短路电流有效值:
I0.1= I" = 8.512(KA)
0.2秒短路电流有效值:
I0.2= I" = 8.512(KA)
0.4秒短路电流有效值:
I0.4= I" = 8.512(KA)
0.6秒短路电流有效值:
I0.6= I" = 8.512(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×8.512 = 21.669(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 8.512√[1+2×(1.800-1)2] = 12.853(KA)
起始短路容量:
S" = √3*Uj*I" = √3×37.000×8.512 = 545.5(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 8.512 = 8.51(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 8.512 = 8.51(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 8.5122+10×8.5122+8.5122×0.5/12 = 36.23(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 8.512 = 8.51(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 8.512 = 8.51(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 8.5122+10×8.5122+8.5122×0.5/12 = 289.84(kA2·S)
1.1.3 ##1短路点系统C3分支
分支名称:系统C3
分支电抗标幺值:
正序X1 = 0.3300
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×37.000×0.330) = 4.729(KA)
0.01秒短路电流有效值:
I0.01= I" = 4.729(KA)
0.1秒短路电流有效值:
I0.1= I" = 4.729(KA)
0.2秒短路电流有效值:
I0.2= I" = 4.729(KA)
0.4秒短路电流有效值:
I0.4= I" = 4.729(KA)
0.6秒短路电流有效值:
I0.6= I" = 4.729(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×4.729 = 12.038(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 4.729√[1+2×(1.800-1)2] = 7.141(KA)
起始短路容量:
S" = √3*Uj*I" = √3×37.000×4.729 = 303.1(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 4.729 = 4.73(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 4.729 = 4.73(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 4.7292+10×4.7292+4.7292×0.5/12 = 11.18(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 4.729 = 4.73(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 4.729 = 4.73(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 4.7292+10×4.7292+4.7292×0.5/12 = 89.46(kA2·S)
1.1.4 ##1短路点小计:
##1短路点总电抗标幺值:正序X1 = 0.0092
短路电流周期分量起始值:
I" = 156.041+8.512+4.729 = 169.282(kA)
0.01秒短路电流有效值:
I0.01=156.041+8.512+4.729 = 169.282(kA)
0.1秒短路电流有效值:
I0.1=156.041+8.512+4.729 = 169.282(kA)
0.2秒短路电流有效值:
I0.2=156.041+8.512+4.729 = 169.282(kA)
0.4秒短路电流有效值:
I0.4=156.041+8.512+4.729 = 169.282(kA)
0.6秒短路电流有效值:
I0.6=156.041+8.512+4.729 = 169.282(kA)
短路电流全电流最大有效值:
Ich = 235.616+12.853+7.141 = 255.610(kA)
短路冲击电流值:
ich = 397.215+21.669+12.038 = 430.922(kA)
起始短路容量:
S" = 10000.0+545.5+303.1 = 10848.6(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = 156.041+8.512+4.729 = 169.282(kA)
短路电流在T1秒时的周期分量有效值:
Izt = 156.041+8.512+4.729 = 169.282(kA)
短路电流周期分量热效应:
Qz = (∑I")2+10*(∑Izt/2)2+(∑Izt)2*t/12
= 169.2822+10×169.2822+169.2822×0.5/12
= 14328.21(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = 156.041+8.512+4.729 = 169.282(kA)
短路电流在T2秒时的周期分量有效值:
Izt = 156.041+8.512+4.729 = 169.282(kA)
短路电流周期分量热效应:
Qz = (∑I")2+(∑10*Izt/2)2+(∑Izt)2*t/12
= 169.2822+10×169.2822+169.2822×0.5/12
= 114625.72(kA2·S)
1.2 ##1不对称短路电流计算
各序阻抗参数:
正序X1 = 0.0092
负序X2 = 0.0092
零序X0 = 0.0092
1.2.1 ##1两相短路电流计算
两相短路电流:
I" = √3*Ij/(X1+X2) = √3×1.560/(0.0092+0.0092) = 146.603(kA)
两相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×146.603 = 373.189(kA)
两相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 146.603√[1+2×(1.800-1)2] = 221.365(kA)
两相短路容量:
S" = √3*Uj*I" = √3×37.000×146.603 = 9395.2(MVA)
1.2.2 ##1单相短路电流计算
单相短路电流:
I" = 3*Ij/(X1+X2+X0) = √3×1.560/(0.0092+0.0092+0.0092) = 169.282(kA)
单相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×169.282 = 430.922(kA)
单相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 169.282√[1+2×(1.800-1)2] = 255.610(kA)
单相短路容量:
S" = √3*Uj*I" = √3×37.000×169.282 = 10848.6(MVA)
1.2.3 ##1两相接地短路电流计算
合成电流系数:
m =√3*√[1-X1*X0/(X1+X0)2]
= √3*√[1-0.0092*0.0092/(0.0092+0.0092)2] = 0.750
两相接地短路电流:
I" = m*Ij/[X1+(X2*X0/(X2+X0))]
= 0.750*1.560/[0.0092+(0.0092*0.0092/(0.0092+0.0092))] = 169.282(kA)
两相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×169.282 = 430.922(kA)
两相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 169.282√[1+2×(1.800-1)2] = 255.610(kA)
两相短路容量:
S" = √3*Uj*I" = √3×37.000×169.282 = 10848.6(MVA)
2、短路点##2
2.1对称短路计算(三相短路)
短路点平均电压Uj = 10.500 kV
短路点基准电流Ij = Sj/(√3Uj) = 100.000/(√3×10.500) = 5.499 kA
2.1.1 ##2短路点系统C1分支
分支名称:系统C1
分支电抗标幺值:
正序X1 = 0.1150
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×10.500×0.115) = 47.820(KA)
0.01秒短路电流有效值:
I0.01= I" = 47.820(KA)
0.1秒短路电流有效值:
I0.1= I" = 47.820(KA)
0.2秒短路电流有效值:
I0.2= I" = 47.820(KA)
0.4秒短路电流有效值:
I0.4= I" = 47.820(KA)
0.6秒短路电流有效值:
I0.6= I" = 47.820(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×47.820 = 121.730(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 47.820√[1+2×(1.800-1)2] = 72.206(KA)
起始短路容量:
S" = √3*Uj*I" = √3×10.500×47.820 = 869.7(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 47.820 = 47.82(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 47.820 = 47.82(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 47.8202+10×47.8202+47.8202×0.5/12 = 1143.37(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 47.820 = 47.82(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 47.820 = 47.82(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 47.8202+10×47.8202+47.8202×0.5/12 = 9146.97(kA2·S)
2.1.2 ##2短路点系统C2分支
分支名称:系统C2
分支电抗标幺值:
正序X1 = 0.0200
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×10.500×0.020) = 274.929(KA)
0.01秒短路电流有效值:
I0.01= I" = 274.929(KA)
0.1秒短路电流有效值:
I0.1= I" = 274.929(KA)
0.2秒短路电流有效值:
I0.2= I" = 274.929(KA)
0.4秒短路电流有效值:
I0.4= I" = 274.929(KA)
0.6秒短路电流有效值:
I0.6= I" = 274.929(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×274.929 = 699.854(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 274.929√[1+2×(1.800-1)2] = 415.133(KA)
起始短路容量:
S" = √3*Uj*I" = √3×10.500×274.929 = 5000.0(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 274.929 = 274.93(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 274.929 = 274.93(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 274.9292+10×274.9292+274.9292×0.5/12 = 37792.89(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 274.929 = 274.93(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 274.929 = 274.93(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 274.9292+10×274.9292+274.9292×0.5/12 = 302343.16(kA2·S)
2.1.3 ##2短路点系统C3分支
分支名称:系统C3
分支电抗标幺值:
正序X1 = 0.0360
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×10.500×0.036) = 152.738(KA)
0.01秒短路电流有效值:
I0.01= I" = 152.738(KA)
0.1秒短路电流有效值:
I0.1= I" = 152.738(KA)
0.2秒短路电流有效值:
I0.2= I" = 152.738(KA)
0.4秒短路电流有效值:
I0.4= I" = 152.738(KA)
0.6秒短路电流有效值:
I0.6= I" = 152.738(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×152.738 = 388.808(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 152.738√[1+2×(1.800-1)2] = 230.630(KA)
起始短路容量:
S" = √3*Uj*I" = √3×10.500×152.738 = 2777.8(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 152.738 = 152.74(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 152.738 = 152.74(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 152.7382+10×152.7382+152.7382×0.5/12 = 11664.47(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 152.738 = 152.74(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 152.738 = 152.74(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 152.7382+10×152.7382+152.7382×0.5/12 = 93315.79(kA2·S)
2.1.4 ##2短路点小计:
##2短路点总电抗标幺值:正序X1 = 0.0116
短路电流周期分量起始值:
I" = 47.820+274.929+152.738 = 475.487(kA)
0.01秒短路电流有效值:
I0.01=47.820+274.929+152.738 = 475.487(kA)
0.1秒短路电流有效值:
I0.1=47.820+274.929+152.738 = 475.487(kA)
0.2秒短路电流有效值:
I0.2=47.820+274.929+152.738 = 475.487(kA)
0.4秒短路电流有效值:
I0.4=47.820+274.929+152.738 = 475.487(kA)
0.6秒短路电流有效值:
I0.6=47.820+274.929+152.738 = 475.487(kA)
短路电流全电流最大有效值:
Ich = 72.206+415.133+230.630 = 717.969(kA)
短路冲击电流值:
ich = 121.730+699.854+388.808 = 1210.392(kA)
起始短路容量:
S" = 869.7+5000.0+2777.8 = 8647.5(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = 47.820+274.929+152.738 = 475.487(kA)
短路电流在T1秒时的周期分量有效值:
Izt = 47.820+274.929+152.738 = 475.487(kA)
短路电流周期分量热效应:
Qz = (∑I")2+10*(∑Izt/2)2+(∑Izt)2*t/12
= 475.4872+10×475.4872+475.4872×0.5/12
= 113043.83(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = 47.820+274.929+152.738 = 475.487(kA)
短路电流在T2秒时的周期分量有效值:
Izt = 47.820+274.929+152.738 = 475.487(kA)
短路电流周期分量热效应:
Qz = (∑I")2+(∑10*Izt/2)2+(∑Izt)2*t/12
= 475.4872+10×475.4872+475.4872×0.5/12
= 904350.63(kA2·S)
2.2 ##2不对称短路电流计算
各序阻抗参数:
正序X1 = 0.0116
负序X2 = 0.0116
零序X0 = 0.0116
2.2.1 ##2两相短路电流计算
两相短路电流:
I" = √3*Ij/(X1+X2) = √3×5.499/(0.0116+0.0116) = 411.784(kA)
两相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×411.784 = 1048.230(kA)
两相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 411.784√[1+2×(1.800-1)2] = 621.780(kA)
两相短路容量:
S" = √3*Uj*I" = √3×10.500×411.784 = 7488.9(MVA)
2.2.2 ##2单相短路电流计算
单相短路电流:
I" = 3*Ij/(X1+X2+X0) = √3×5.499/(0.0116+0.0116+0.0116) = 475.487(kA)
单相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×475.487 = 1210.392(kA)
单相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 475.487√[1+2×(1.800-1)2] = 717.969(kA)
单相短路容量:
S" = √3*Uj*I" = √3×10.500×475.487 = 8647.5(MVA)
2.2.3 ##2两相接地短路电流计算
合成电流系数:
m =√3*√[1-X1*X0/(X1+X0)2]
= √3*√[1-0.0116*0.0116/(0.0116+0.0116)2] = 0.750
两相接地短路电流:
I" = m*Ij/[X1+(X2*X0/(X2+X0))]
= 0.750*5.499/[0.0116+(0.0116*0.0116/(0.0116+0.0116))] = 475.487(kA)
两相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×475.487 = 1210.392(kA)
两相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 475.487√[1+2×(1.800-1)2] = 717.969(kA)
两相短路容量:
S" = √3*Uj*I" = √3×10.500×475.487 = 8647.5(MVA)
3、短路点##3
3.1对称短路计算(三相短路)
短路点平均电压Uj = 115.000 kV
短路点基准电流Ij = Sj/(√3Uj) = 100.000/(√3×115.000) = 0.502 kA
3.1.1 ##3短路点系统C1分支
分支名称:系统C1
分支电抗标幺值:
正序X1 = 0.1150
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×115.000×0.115) = 4.366(KA)
0.01秒短路电流有效值:
I0.01= I" = 4.366(KA)
0.1秒短路电流有效值:
I0.1= I" = 4.366(KA)
0.2秒短路电流有效值:
I0.2= I" = 4.366(KA)
0.4秒短路电流有效值:
I0.4= I" = 4.366(KA)
0.6秒短路电流有效值:
I0.6= I" = 4.366(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×4.366 = 11.114(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 4.366√[1+2×(1.800-1)2] = 6.593(KA)
起始短路容量:
S" = √3*Uj*I" = √3×115.000×4.366 = 869.7(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 4.366 = 4.37(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 4.366 = 4.37(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 4.3662+10×4.3662+4.3662×0.5/12 = 9.53(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 4.366 = 4.37(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 4.366 = 4.37(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 4.3662+10×4.3662+4.3662×0.5/12 = 76.25(kA2·S)
3.1.2 ##3短路点系统C2分支
分支名称:系统C2
分支电抗标幺值:
正序X1 = 0.0200
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×115.000×0.020) = 25.102(KA)
0.01秒短路电流有效值:
I0.01= I" = 25.102(KA)
0.1秒短路电流有效值:
I0.1= I" = 25.102(KA)
0.2秒短路电流有效值:
I0.2= I" = 25.102(KA)
0.4秒短路电流有效值:
I0.4= I" = 25.102(KA)
0.6秒短路电流有效值:
I0.6= I" = 25.102(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×25.102 = 63.900(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 25.102√[1+2×(1.800-1)2] = 37.903(KA)
起始短路容量:
S" = √3*Uj*I" = √3×115.000×25.102 = 5000.0(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 25.102 = 25.10(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 25.102 = 25.10(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 25.1022+10×25.1022+25.1022×0.5/12 = 315.06(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 25.102 = 25.10(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 25.102 = 25.10(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 25.1022+10×25.1022+25.1022×0.5/12 = 2520.48(kA2·S)
3.1.3 ##3短路点系统C3分支
分支名称:系统C3
分支电抗标幺值:
正序X1 = 0.0360
短路电流周期分量起始值:
I" = Sj/(√3*Uj*X1 ) = 100.000/(√3×115.000×0.036) = 13.946(KA)
0.01秒短路电流有效值:
I0.01= I" = 13.946(KA)
0.1秒短路电流有效值:
I0.1= I" = 13.946(KA)
0.2秒短路电流有效值:
I0.2= I" = 13.946(KA)
0.4秒短路电流有效值:
I0.4= I" = 13.946(KA)
0.6秒短路电流有效值:
I0.6= I" = 13.946(KA)
短路冲击电流值:
ich = √2*Kch*I" = √2×1.800×13.946 = 35.500(KA)
短路电流全电流最大有效值:
Ich = I"√[1+2*(Kch-1)2] = 13.946√[1+2×(1.800-1)2] = 21.057(KA)
起始短路容量:
S" = √3*Uj*I" = √3×115.000×13.946 = 2777.8(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 13.946 = 13.95(kA)
短路电流在T1秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 13.946 = 13.95(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 13.9462+10×13.9462+13.9462×0.5/12 = 97.24(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = Ig * It/2 = 1.000 × 13.946 = 13.95(kA)
短路电流在T2秒时的周期分量有效值:
Izt = Ig * It = 1.000 × 13.946 = 13.95(kA)
短路电流周期分量热效应:
Qz = I"2+10*Izt/22+Izt2*t/12 = 13.9462+10×13.9462+13.9462×0.5/12 = 777.93(kA2·S)
3.1.4 ##3短路点小计:
##3短路点总电抗标幺值:正序X1 = 0.0116
短路电流周期分量起始值:
I" = 4.366+25.102+13.946 = 43.414(kA)
0.01秒短路电流有效值:
I0.01=4.366+25.102+13.946 = 43.414(kA)
0.1秒短路电流有效值:
I0.1=4.366+25.102+13.946 = 43.414(kA)
0.2秒短路电流有效值:
I0.2=4.366+25.102+13.946 = 43.414(kA)
0.4秒短路电流有效值:
I0.4=4.366+25.102+13.946 = 43.414(kA)
0.6秒短路电流有效值:
I0.6=4.366+25.102+13.946 = 43.414(kA)
短路电流全电流最大有效值:
Ich = 6.593+37.903+21.057 = 65.554(kA)
短路冲击电流值:
ich = 11.114+63.900+35.500 = 110.514(kA)
起始短路容量:
S" = 869.7+5000.0+2777.8 = 8647.5(MVA)
T1 = 0.5s:
短路电流在T1/2秒时的周期分量有效值:
Izt/2 = 4.366+25.102+13.946 = 43.414(kA)
短路电流在T1秒时的周期分量有效值:
Izt = 4.366+25.102+13.946 = 43.414(kA)
短路电流周期分量热效应:
Qz = (∑I")2+10*(∑Izt/2)2+(∑Izt)2*t/12
= 43.4142+10×43.4142+43.4142×0.5/12
= 942.39(kA2·S)
T2 = 4s:
短路电流在T2/2秒时的周期分量有效值:
Izt/2 = 4.366+25.102+13.946 = 43.414(kA)
短路电流在T2秒时的周期分量有效值:
Izt = 4.366+25.102+13.946 = 43.414(kA)
短路电流周期分量热效应:
Qz = (∑I")2+(∑10*Izt/2)2+(∑Izt)2*t/12
= 43.4142+10×43.4142+43.4142×0.5/12
= 7539.10(kA2·S)
3.2 ##3不对称短路电流计算
各序阻抗参数:
正序X1 = 0.0116
负序X2 = 0.0116
零序X0 = 0.0116
3.2.1 ##3两相短路电流计算
两相短路电流:
I" = √3*Ij/(X1+X2) = √3×0.502/(0.0116+0.0116) = 37.598(kA)
两相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×37.598 = 95.708(kA)
两相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 37.598√[1+2×(1.800-1)2] = 56.771(kA)
两相短路容量:
S" = √3*Uj*I" = √3×115.000×37.598 = 7488.9(MVA)
3.2.2 ##3单相短路电流计算
单相短路电流:
I" = 3*Ij/(X1+X2+X0) = √3×0.502/(0.0116+0.0116+0.0116) = 43.414(kA)
单相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×43.414 = 110.514(kA)
单相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 43.414√[1+2×(1.800-1)2] = 65.554(kA)
单相短路容量:
S" = √3*Uj*I" = √3×115.000×43.414 = 8647.5(MVA)
3.2.3 ##3两相接地短路电流计算
合成电流系数:
m =√3*√[1-X1*X0/(X1+X0)2]
= √3*√[1-0.0116*0.0116/(0.0116+0.0116)2] = 0.750
两相接地短路电流:
I" = m*Ij/[X1+(X2*X0/(X2+X0))]
= 0.750*0.502/[0.0116+(0.0116*0.0116/(0.0116+0.0116))] = 43.414(kA)
两相短路冲击电流:
ich = √2*Kch*I" = √2×1.800×43.414 = 110.514(kA)
两相短路电流全电流:
Ich = I"√[1+2*(Kch-1)2] = 43.414√[1+2×(1.800-1)2] = 65.554(kA)
两相短路容量:
S" = √3*Uj*I" = √3×115.000×43.414 = 8647.5(MVA)