Studies on Overheating Fault of Disconnecting Switch

Abstract

Abstract This paper mainly presents typical solutions to disconnecting switch overheating and mechanical problems of power grid in Extra High Voltage (EHV). In recent years, many faults have happened in the EHV power grid due to overheating and mechanical problems of disconnecting switches in Inner Mongolia. Dust storm weather and the special structure are main reasons which induced disconnecting switch lower operation reliability. For the overheating problems, the solutions include using conducting metal belt, replacing material of knee-arm wheel and modifying the structure of rolling-contact assembly; for the mechanical problems, the solutions include using dust shield, renovating operating mechanism and decreasing mechanically-driven part. Meanwhile suggestions are proposed as well for the design and application of isolator in the power networks of Western Inner Mongolia and the Northwester China which have similarly peculiar natural environments.