一起直流线芯误碰交流导致开关误跳闸分析

Analysis of Switching Error Trip Caused by Error Contact of DC Wire Core with AC Terminal

介绍某电厂维护人员在查找直流接地故障时,将直流线芯误碰交流电源备用端子,导致500kV和220kV升压站三台开关同时误跳闸的恶性误碰事故,指出直流控制回路串入交流的危害,分析了事件原因及暴露出的问题,提出了整改措施。

This paper introduces a serious false operation accident that DC wire core is inadvertently put in touch with AC power supply spare terminal when maintenance personnel are looking up the DC grounding fault, which causes the simultaneous false trips of three switches in 500 kV and 220 kV booster station, it also points out the harm caused when DC control circuit is connected to the alternating current circuit, analyzes the cause of the event and the problems occurred, and puts forward the corrective measures.