一起CT断线告警引起母线保护退出运行的故障分析

Malfunction Analysis of Bus Protection Out of Services Because of Current Transformer Disconnection Alarm

介绍一起由闸刀辅助接点损坏引起母线保护CT断线告警的故障,通过对BP-2B差流回路和闸刀开入逻辑的分析,得出此故障是由于外部回路的闸刀接点开入错误所导致,提出多种可行性解决方案,以期减少和杜绝因闸刀辅助接点损坏或接触不良可能引起的危害。

Introduction was made to the malfunction of current transformer disconnection alarm owing to the auxiliary contact broken in isolating switch. This paper analyzed the BP-2B difference stream circuit and the making and breaking logic in isolating switch. The mistakes caused by making and breaking of the contacts in isolating switch of peripheral circuit made bus protection out of services. Some feasibility solutions were proposed, so as to reduce and avoid the negative infl uence of the auxiliary contact broken and poor contact in isolating switch.