10kV 4PT接线方式因错误接线引起的故障实例分析

Analysis of Failure Cases Caused by Wrong Wiring in 10kV 4PT Connection Mode

10kV电压互感器带消谐互感器的接线方式(简称4PT)为辽宁省的主流接线方式。通过实际运行表明,4PT接线方式抑制铁磁谐振效果较好。但是,由于4PT特殊的接线形式使得互感器一旦出现故障,其一次保护熔丝有时不能及时熔断,从而使故障扩大。本文总结了由于4PT接线错误造成的系统事故或异常现象,并举实例加以分析说明。

Absrtact:The connection mode of 10kV voltage transformer with harmonic elimination transformer(4PT)is the mainstream connection mode in Liaoning Province.The actual operation shows that the 4PT connection mode is effective in restraining ferromagnetic resonance.However,due to the special connection form of 4PT,once the transformer fails,its primary protection fuse sometimes fails to fuse in time,which enlarges the fault.This paper summarized the system accidents or abnormal phenomena caused by 4PT wiring errors,and gave examples to illustrate them.