110 kV旁母旁带方式下母联保护电流极性设计

The Polarity Design of the Busbar Protection Current in 110kV Side-by-side Sideband Mode

针对某高瓦斯矿井110kV旁母带进出线断路器时存在母联CT极性与实际电流流向不一致的问题,设计一个110kV母联CT的极性切换压板,通过该压板的切换可以实现不同运行方式下,旁母带110kV各段进出线断路器时都能使得方向零序保护正确动作,确保该电网始终保持双电源供电,大大提高区域系统电源侧的可靠性。

In order to solve the problem that there is a mismatch between the polarity of mother-to-joint CT and the actual current flow when the circuit breaker of the110kV side mother-inlet-outline of Chengzhuang Gaowasi Mine is inconsistent,a110kV mother-clamped CT polarity switching platen was designed,which could be achieved by switching the platen.In the operating mode,the direction and zero-sequence protection can be correctly operated when the110mV line breakers of the side masters are adjacent to each other to ensure that the grid always maintains the dual-supply power supply and the reliability of the power supply side of the regional system is greatly improved.