母联死区保护原理分析及改进方法

Analysis of the Principle and Improvement Methods of Busbar Dead Zone Protection

阐述了母联开关在分位、合位、充电等状态时母线保护死区故障的逻辑原理,分析了母联电流互感器不同配置及安装位置下母线保护的动作行为特征,提出了针对母联CT双侧布置的改进方法,即通过增加2组母联电流互感器并将差流作为冗余判据,进而决定保护逻辑,有效避免了2条母线均被断开的问题。

The logical principle of the busbar dead zone protection fault of the busbar switch in the states of quantile,fit,charging,etc.is described and the action behavior characteristics of the busbar protection under different configuration and installation positions of the busbar current transformer are analyzed.An improved method for the double-sided arrangement of busbar CT is proposed,that is,the protection logic is determined by adding two sets of busbar current transformers and taking differential current as the redundancy criterion,which effectively avoids the problem that both busbars are disconnected.