保护装置压力监视回路的缺陷分析

介绍了继电保护二次回路中的压力监视回路。分析了在新的线路保护设计规范推出后保护装置压力监视回路中出现的缺陷,即在第1组操作电源失电时,会造成2组操作回路同时断线,将断路器误闭锁,致使线路有故障时断路器无法跳闸。提出了保护装置只需闭锁重合闸,断路器分、合闸闭锁靠机构本体二次回路实施闭锁的解决方案。

Analysis on defect of pressure monitoring circuit of protection devices

The pressure monitoring circuit of relay protection secondary circuit was introduced.The defect of pressure monitoring circuit of protection devices in new line protection design specification was analyzed,which is that when the first group operating power source is cut off;the second group operating circuit will be broken simultaneously,the breaker will be blocked incorrectly and can not trip after the line fault occurred.A solving scheme was put forward,in which the protection device will only block the reclosing mechanism,and the blocking of breaker open and close will be realized by secondary circuit of the breaker itself.