特高压换流阀闭锁时中性母线断路器故障分析

Fault Analysis of Neutral Bus Circuit Breaker During Locking of UHV Converter Valve

针对某特高压换流站直流系统调试期间换流阀闭锁时直流转换开关中性母线断路器故障,通过查看故障分闸时电流录波波形,核对现场主设备安装位置,分析出中性母线断路器跳闸失败的故障原因为光纤电流互感器安装位置错误,并对该电流互感器接线进行改正,为同类事件的处理提供参考。

As for a fault of the neutral busbar circuit breaker of a DC conversion switch during the debugging of the DC system of an UHV converter station,by checking the current waveform recorded during the fault opening,the installation position of the main equipment on site is verified,and analysis is carried out on the failure causes such that the failure of neutral busbar circuit breaker tripping is caused by the incorrect installation position of the fiber optic current transformer.The wiring of the current transformer is then corrected,offering reference for handling similar events.