一种有效防止因直流系统异常导致断路器误动的新方法

A new way to eliminate circuit breaker misoperation because of the fault in DC system

直流系统异常导致断路器无故障跳闸的事故在电力系统中屡见不鲜,对目前采用的常规方法进行了对比分析,提出在保护动作后驱动继电器的一对常开、常闭可双向切换的触点,利用常闭触电并联的方式闭锁跳闸继电器,可以有效防止因直流系统异常导致断路器误动事故,不影响原有回路的动作可靠性,同时也不增加任何的附加时延。通过对实际应用进行分析,指出本方法的适用范围,对继电保护跳闸回路的改造具有指导意义。

DC system is a very important equipment in substation. It＇s very common that circuit breaker misoperation because of the fault in DC system. And it＇s very difficult to eliminate this phenomenon. The paper introduces some general methods to deal with it, and offers a new way to eliminate the affection of the fault in DC system. Using an electric shock parallel to normally closed latching trip relays can effectively prevent abnormal DC system circuit breaker malfunction caused by the accident. Through the analysis of practical application, this paper points out that the scope of application of this method. It has some steering meaning for relay protection trip circuit modification.