电流互感器位置与死区故障保护动作行为分析

Action Behavior Analysis of Current Transformer Position and Dead-zone Fault Protection

文中对电流互感器(CT)在不同安装位置发生位于断路器与CT之间的故障进行了保护的动作行为分析。同时分析了死区故障时,断路器失灵保护和死区保护的动作逻辑,梳理了四川电网220 kV以上断路器CT安装位置的现状,并提出为了保障系统稳定应严格按照反事故措施要求将CT在断路器两侧布置的建议。

The action behavior of the protection is analyzed when current transformer(CT)is installed in different positions in case that the fault point is between the circuit breaker and the CT.If the action behavior could not remove the fault reliably,the range of outage would be extended.At the same time,in the case of a dead-zone fault,the action logics of the failure protection of circuit breaker and the dead-zone protection are analyzed.The current situation of the installation locations of CT of 220 kV circuit breaker and above in Sichuan power grid is summarized,and based on the existing researches,the suggestions are proposed that the CT should be arranged on both sides of circuit breaker strictly in accordance with the requirements of anti-accident measures.