110kv变电站课程设计最终版

*XL3?XL3SB100?0.5?32??0.1210 22UAv115SB100?10??0.0756 2UAv1152*XL4?XL4*XS1?XS1SB100?0.6??0.3 UN1200SB100?0.6??0.05 UN21200*XS2?XS2计算后等值电路如下

图1-3 系统等值网络化简图

1.4.1 110kv侧母线短路计算 网络为：

图1-4 110kV侧短路的等值电路图

16

△/Y变换：

图1-5 110kV侧短路的等值电路图

Y/△变换：

图1-6 110kV侧短路的等值电路图

则有：

图1-7 110kV侧短路的等值电路图

*XJS1?X1SN1200?0.384??0.768 UB100SN21200?0.2679??1.5348 UB100*XJS2?X2***查计算曲线数字表可得：I1?0??1.360，I1?1??1.284，I1?2??1.464 ***I2?0??0.70，I2?1??0.671，I2?2??0.671

换算成有名值为：

I?0??I1*(0)?I?1??I1*(1)?SN13UAvSN13UAv*?I2(0)?SN23UAvSN23UAv?1.360?2003?115?0.7?12003?115?5.5827KA

*?I2(1)??1.284?2001200?0.671??5.3317KA 3?1153?115I?2??I1*(2)?SN13UAv*?I2(2)?SN23UAv?1.464?2003?115?0.671?12003?115?5.5124KA

17

Ich?2.55I(0)?2.55?5.5827?14.2359KA 1.4.2 10kv侧母线短路计算

图1-8 10kV侧短路的等值电路图

图1-9 10kV侧短路的等值电路图

Y/△变换：

图1-10 10kV侧短路的等值电路图

18

图1-11 10kV侧短路的等值电路图

*XJS1?X1SN1200?1.2359??2.4718 UB100SN21200?0.8620??10.344>3.45 UB100*XJS2?X2***查计算曲线数字表可得：I1，I1?0??0.4135，I1?0.5??0.4151?1??0.4151

换算成有名值为：

I?0??I1*(0)?I?0.5??I1*(0.5)?SN13UAvSN1*?I2(0)?SN23UAvSN2?0.4135?11200??10.926KA3?10.510.3443?10.5?20011200???10.9437KA3?3710.3443?372003UAv*?I2(0.5)?3UAv?0.4151?I?1??I1*(1)?SN13UAv*?I2(1)?SN23UAv?0.4151?20011200???10.9437KA10.3443?373?37Ich?2.55I(0)?2.55?10.926?27.8613KA

19