变电站220kV母线故障时母差保护功能分析

Analysis of Bus Differential Protection Function on 220 kV Bus Fault

结合铜陵供电公司500 kV官山变电站220 kV一次系统运行方式变更对220 kV母差保护的功能影响及要求,阐述220 kV母差保护工作原理,对220 kV母差保护在投运中出现的问题进行分析,并着重分析改造后的母差保护在母线故障情况下分段断路器失灵以及发生死区故障母差保护的动作过程,介绍分段断路器失灵和死区故障情况下母差保护的动作逻辑。

In this paper,combine with 500 kV Cuanshan substation of Tongling power supply company on the 220 kV system operation mode changes the function of bus differential protection and requirements,it introduces the work principle of 220 kV bus differential protection,analyzes the problems of 220 kV bus differential protection put into operation,focusing on analysis after transformation,the bus differential protection in case of bus faults section switches malfunction and dead-zone fault occurs the action process of bus protection,and describes the action logic of bus protection of switches malfunction and dead-zone fault.