附录1 短路电流计算书
系统的等值电抗图如下：
图1
(1) 各绕组电抗计算
1 Vs1%?Vs?1?2?%?Vs?1?3?%?Vs?2?3?%?10.75
21 Vs2%?Vs?1?2?%?Vs?2?3?%?Vs?1?3?%??0.25
21 Vs3%?Vs?2?3?%?Vs?1?3?%?Vs?1?2?%?10.75
2??????（2）各阻抗标幺值计算，基准容量SB?100MVA 则 变压器：X?T?11?X?T?21?Vs1%?SB10.75?100??0.267
100?SN100?40 X?T?12?X?T?22?0
34 页 第
X?T?13?X?T?23? 架空线：X?L1?18?0.4?Vs3%?SB6.75?100??0.169
100?SN100?40100?0.0544 1152100?0.0605 X?L2?20?0.4?2115(3)各短路点短路电流计算
1) 当f1 处发生短路，经过阻抗等效变换后
图2
X?js1?X1SN1?0.0644 UBSN2?1.288 UBX?js2?X1由计算曲线数字表根据线性差值得到查表结果：
I1??0??12.4241，I1??1??3.5232，I1??2??2.7586
?I2?0??0.8007，I2??1??0.8380，I2??2??0.8451
短路电流周期有名值：
I?0??I1??0??I?1??I1??1??I?2??I1??2??SN13UAVSN13UAVSN13UAV??I2?0??SN23UAVSN23UAVSN23UAV?12.4241?100200?0.8007??7.0402kA3?1153?115??I2?1???3.5232?100200?0.8390??2.6102kA3?1153?115100200?0.8451??2.8546kA 3?1153?115??I2?2???2.7586?2）f2 处发生短路，经过阻抗等效变换后
35 页 第
图3
X?js1?X1SN1?0.598 UBSN2?0.221 UBX?js2?X1由计算曲线数字表根据线性差值得到查表结果：
I1??0??1.748，I1??1??1.698，I1??2??1.884
?I2?0??5.185，I2??1??2.777，I2??2??2.584
短路电流周期有名值：
I?0??I1??0??I?1??I1??1??I?2??I1??2??SN13UAVSN13UAVSN13UAV??I2?0??SN23UAVSN23UAVSN23UAV?1.748?100200?5.185??6.0775kA3?1153?115100200?2.777??3.641kA3?1153?115100200?2.584??5.046kA 3?1153?115??I2?1???1.699???I2?2???1.884?短路冲击电流Ich?2.55I?0??2.55?6.0775?15.4976kA 3）f3 处发生短路，经过Y/△等效变换后
36 页 第
图4
Z12?Z1?Z2?Z1?Z20.331?0.3775?0.331?0.3775??2.1872 Z30.0845Z2?Z30.845?0.3775?0.845?0.3775??0.5583 Z10.331Z3?Z10.331?0.0845?0.0845?0.331??0.4261 Z20.3775 Z23?Z2?Z3? Z31?Z3?Z1?X?js1?X1SN1?0.4261 UBSN2?1.1161 UBX?js2?X1由计算曲线数字表根据线性差值得到查表结果：
I1??0??2.531，I1??1??1.946，I1??2??1.956
?I2?0??0.940，I2??1??0.876，I2??2??0.966
短路电流周期有名值：
I?0??I1??0??SN13UAV??I2?0??SN23UAV?2.531?100200?0.940??24.254kA3?10.53?10.5 37 页 第
I?1??I1??1??I?2??I1??2??SN13UAVSN13UAV??I2?1??SN23UAVSN2?1.946?100200?0.876??20.322kA
3?10.53?10.5100200?0.966??21.378kA
3?10.53?10.5??I2?2??3UAV?1.956?短路冲击电流Ich?2.55I?0??2.55?24.254?61.8477kA 4）f4 处发生短路，经过阻抗等效变换后
图5
X?js1?X1SN1?0.331 UBSN2?0.755 UBX?js2?X1由计算曲线数字表根据线性差值得到查表结果：
I1??0??3.2635，I1??0.5??2.312，I1??1??2.2665
?I2?0??1.390，I2??0.5??1.225，I2??1??1.305
短路电流周期有名值：
I?0??I1??0??I?1??I1??1??SN13UAVSN13UAV??I2?0??SN23UAVSN23UAV?13.2635?100200?1.390??9.4302kA3?373?37??I2?1???2.312?100200?1.225??7.4306kA3?373?37 38 页 第