The Problems and Solutions for 154kV Power Transformer neutral point Ground

154kV 송수전용 변압기 중성점 접지시 문제점과 해결방안

To restrain abnormal voltage and effective operation in protect system, some of customer in Korea earth their own transformer in 154kV power system. The above ground system has some problems if ground fault occurs in other related area such as ground relay errors, under count register in two element register system. There for most huge customers opens the ground neutral and it causes errors in insulate and protection coordination and register system. In this paper presents the solution for above system.