断路器非全相保护误动故障排查及对策

Ascertaining the Malfunction of Open-phase Protection for Circuit Breakers and Countermeasure

在实践中,断路器非全相保护未能得到应有的重视。分析了非全相保护的原理及装设要求。针对两起220 kV断路器的非全相保护误动故障,介绍了故障原因排除法查找的具体过程及故障原因的最终确定,提出了防止断路器非全相保护误动作的对策。

The open-phase operation protection for circuit breakers has not been paid enough attention in prac- tice. The paper analyzes the principle of open phase operation protection and its installation requirements. In light of the malfunction of open-phase operation protection for 220 kV circuit breakers, the paper describes the process of trouble shootings by exclusive method and the final determination of fault cause, and presents the countermeasures for preventing malfunction of open-phase operation protection.