变压器零序差动保护电流互感器极性校对方法探讨

Probe into Proofreading Method of Polarity of Transformer Zero-sequence Differential Protection Current Transformer

介绍了变压器零序差动保护的基本原理及其TA极性现场配置方法,指出变压器零序差动保护误动的主要原因。通过分析变压器受冲击时励磁涌流的形成过程,提出利用励磁涌流来校验TA极性的方法;同时还提出利用模拟单相接地故障来校验TA极性的方法。

The basic principles of transformer zero-sequence differential protection and its TA polarity field configuration are introduced,at the same time,the main reason of transformer zero-sequence differential protection malfunction is proposed.By analyzing the formation process of transformer inrush current by the shock,a method of using inrush current to verify TA polarity is proposed.Finally,another method of using single-phase ground fault simulated to verify TA polarity is also proposed.