同杆并架线路零序互感对零序电流保护的影响

Influence of zero-sequence mutual inductance of the same pole parallel laying line on zero-sequence current protection

在大电流接地系统中,同杆并架双回线路,其零序互感较大,在各种运行方式下和不同点发生接地短路时,其零序电流的分布和零序等值网络都有很大的变化,因而在计算接地点短路电流和进行零序保护整定时,必须考虑零序互感的影响。

In large elect ric current grounding system, zero-sequence mutual inductance of the same pole parallel laying double loop-lines are greater, when grounding short-circuit happened in various operating mode and different places, the distribution of zero -sequence current and zero - sequence equivalent network have great change, so it＇s necessary to consider the effect of zero - sequence mutual inductance when calculating grounding short-circuit current and setting zero- sequence current protection.