3/2主接线的110kV系统线路保护回路改造新方案

New Return Circuit Transformation Program of 110 kV Power System Line Relay Protection of 3/2 Main Connection

分析了继电保护装置与操作箱一体的110 kV线路保护用于3/2主接线的变电站时,二次回路和保护比较复杂,由于过去设计上的考虑欠缺和维护经验的不足,在运行、操作和倒换运行方式时有可能导致保护告警或误跳断路器,详细阐述了通过在N(S)断路器TWJ的启动回路中串接一付M断路器的常闭辅助接点,避免保护装置易受干扰及误动的可能性,确保保护装置的安全运行,达到保护识别运行方式的目的。

When the 110kV line protection device integrated with the relay protection device and operation box is used in 3/2 main electrical connection of power substation,the secondary circuit and protection configuration become more complex.The lack of consideration in the past design and lack of experience in maintenance always lead to the protection alarm or circuit breaker error trips in working,operating and switching the operation mode.Based on the analysis of these problems,the new solution method: with the TWJ starting circuit of N(S) circuit breaker connected with a pair of normal closed auxiliary contact in the circuit of M circuit breaker is proposed and elaborated.It can make the protection device avoid interference and error action,and ensure the safe operation of the protection device and leads to the purpose of protecting & identifying the operation mode.