短路电流计算：
4.2.1 k1点（ 500KV侧）短路电流计算
SB?750MVA
G10.230.37S2040.339G110.57S120.329发电机计算电抗：XGjs?0.57
XS?0.329
IB?SB?0.825KA 3UB''''t?0s时 IG*=1.80 IG?1.8?0.825?1.485
t?1.8s时 IG*=1.78 IG?1.78?0.825?1.4685 t?3.6s时 IG*=1.94 IG?1.94?0.825?1.6005
I''S*?11??2.619 Xs0.392I''S?IB?I''S*?0.825?2.619?2.161
''I''?I''S?IG?2.161?1.485?3.646
I1.8?IG1.8?I''S?1.4685?2.161?3.6295 I3.6?IG3.6?I''S?1.6005?2.161?3.7615
冲击电流：ish?1.92I''?9.80KA
4.2.2 k2点（220KV 侧）短路电流计算
10.2
20
110.57
G SG S120.329
GS140.731
150.422
340.37
0.339
130.059
5 80.339
0.339 6
-0.221
9-0.221
X11=X1?X3?0.57
X12=X2?X4?0.329
X113=2(X5?X6)?0.059
XX11?X1314=X?X11?X13?0.731 12XX12?X1315=X?X12?X13?0.422 11XGf?X14?0.731 XSf?X15?0.422
发电机计算电抗： XGjs?0.731 I''1S?IS1.8?IS3.6?0.422?2.370 I''G?1.43 IG1.8?1.51 ISB?IGB?7503?230?1.883KA I''G?1.43?1.883?2.692KA
IG1.8?1.51?1.883?2.843KA
IG3.6?1.66
IG3.6?1.66?1.883?3.126KA
''IS?IS1.8?IS3.6?2.370?1.883?4.463KA ''''I''?IG?IS?7.155KA
I1.8?IG1.8?IS1.8?7.306KA I3.6?IG3.6?IS3.6?7.589KA
冲击电流：ish?1.9?2?I''?1.9?2?7.155?19.226KA
4.2.3 k3点（35kV侧）短路电流计算
G10.230.37S2040.339110.57GS120.329G142.748S151.586130.79750.33980.33971.254101.254
X11?X1?X3?0.570X12?X2?X4?0.3921X13?(0.339?1.254)?0.7972X?XX14?1113?X11?X13?2.748X12X12?X13X15??X12?X13?1.586X11XGf?X14?2.748Xsf?X15?1.586发电机计算电抗：XGjs?2.748Is???Is,1.8?Is,3.6?IG???0.37IG,1.8?IG,3.6?0.36750IGB??11.703KA3?37750ISB??11.703KA3?37I???(Is???IG??)?IGB?11.715KAI1.8?I3.6?(0.631?0.36)?11.703?11.598KA冲击电流ish?KM?2I???2?1.9?11.715?31.477KA(KM?1.9)
4.2.4 k4点（0.4kV侧）短路电流计算
1?0.6311.586XT４??0.065750?243.750.2244.547?0.57X16?0.57?244.547?=668.80.3290.329?244.547X17?0.329?244.547??386.0270.571IG*?IG1.8*?IG3.6*??0.0015668.81IS*??0.0026386.027SB750IB???1082.5KA3?UB3?0.4XT4b?0.065?I''?IB(IG*?IS*)?0.0041?1082.5?4.44KA冲击电流：ish=1.92I''?11.93五、主要电气设备选择 5.1.1 500kV高压断路器的校验
Imax?1.05PLmax3UNcos??1.05?951?1153A?IN?2000A3?500
I???3.65KAI1.8?2.63KAI3.6?3.76KAtk?tpr2?tin?ta?3.5?0.02?0.03?3.55s由于tk?1s，不计非周期热效应。短路电流的热效应Qk等与非周期分量热效应Qp，即I??2?10I21.8?I23.63.652?10?2.632?3.762QK??tk??3.55?28.59(KA)2?s?402?3.55(KA)2?s1212tk??tin?0.02s?0.1sX??用Ik校验INbr ，Ta??12.5r?Ik??I2Pt?(2I??e???tkTa2)?3.65?1?2?(e?314?0.0212.5)?4.8KA?INbr?40KAish?1.92I???9.8KA?ies?100KA
500kV降压变电所电气一次部分设计完整版
