0.074E0.1640.0220.3820.02260.3520.027SCBCB0.3820.02260.0510.0220.027S0.352C0.020.183B0.0226B0.02
图3-3 系统零序等值网络图化简
4、B母线故障时，计算线路BC的短路电流结果如下：（注：各化简过程用图示来表示） （1）三相短路：
IE?1）正序短路电流：
IE?'?17.03 60.0587117.036?0.1190.119?0.116?8.627
流过250kmBC线路,通过C侧的短路电流
IBC?4.1370.117?0.127?4.137
化成有名值
Id.1?4.137?603?220?0.670(KA)
（2）两相短路：
IE?10.0587?0.07?7.77
1）正序短路电流：
'? IE0.119?3.9 70.11?90.1163.93?0.1170.117?0.127?1.887.7?7IBC(1)?
化成有名值
Id.1?1.88?603?220?0.306(KA)
2）负序短路电流：
IE?IBC(2)?'7.77?0.1590.159?0.1277.483?0.1170.127?0.117?7.483
?3.588
化成有名值
Id.2?3.588?603?220?0.502(KA)
（3）单相短路
IE?10.0587?0.07?0.02?6.725
1）正序短路电流：
IE?IBC.(1)?'6.725?0.1190.119?0.1163.405?0.1170.127?0.117?3.405
?1.633
化成有名值
Id.1?1.633?603?220?0.253(KA)
2）负序短路电流：
IE?IBC(2)?'6.725?0.1590.159?0.1273.739?0.1170.127?0.117?3.739
?1.793
化成有名值
Id.2?1.793?603?220?0.279(KA)
3）零序短路电流：
IE?IBC(0)?'6.725?0.02260.0226?0.2030.674?0.3520.352?0.382?0.674?0.323
化成有名值
Id.0?0.323?603?220?0.064(KA)
（4）两相短路接地
IE?10.0587?0.07//0.02?13.46
1）正序短路电流：
IE?IBC(1)?'13.46?0.1190.119?0.1166.816?0.1170.127?0.117?6.816
?3.268
化成有名值
Id.1?3.268?603?220?0.505(KA)
2）负序短路电流：
IE?IBC(2)?7.4830.159?0.1277.483?0.117??3.588 0.127?0.117'13.46?0.159
化成有名值
Id.2?3.588?603?220?0.153(KA)
3）零序短路电流：
IE?IBC(0)'13.46?0.02260.0226?0.2031.348?0.352??0.6460.352?0.382?1.348
化成有名值
Id.0?0.646?603?220?0.092(KA)
在C母线故障时，计算经250KM线路流过B端的短路电流。 5、系统正序等值图变换如下：
R0.148D0.04140.00720.1270.117CE0.00660.167NS0.1280.119WBC0.090.00720.127B0.119S0.1280.117C0.0550.061B0.119C0.042
图3-4 系统正序等值网络图化简
6、系统负序等值图变换如下：
R0.203D0.04140.00720.1270.117CBE0.2016NS0.150.159WC0.110.00720.127B0.159S0.150.117C0.0660.061B0.159C0.051
图3-5 系统负序等值网络图化简
7、系统零序等值图变换如下：
0.074E0.1640.0220.3820.02260.3520.027SCBCB0.3820.02260.0510.0220.027S0.352C0.020.183B0.0226C0.018
图3-6 系统零序等值网络图化简
8、C母线故障时，计算线路BC的短路电流结果如下：（注：各化简过程用图示来表示） （1）三相短路： 1）正序短路电流
IE?IE?'10.04223.81?0.0550.055?0.18?23.81
?5.573
流过250kmBC线路,通过C侧的短路电流
IBC?5.573?0.1170.117?0.127?2.672
化成有名值
Id.1?2.672?603?220 ?0.419(KA)??（2）两相短路：
IE?10.042?0.051?10.753
1）正序短路电流：
'? IE10.753?0.0550.055?0.18?2.517