Study of the Effect of Dust Storm on Disconnecting Switch Operation Reliability for EHV Power Grid in Inner Mongolia

摘要

This paper mainly presents typical solutions to disconnecting switch overheating and mechanical problems of power grid in Extra High Voltage (EHV). Many faults have happened in the EHV power grid due to overheating and mechanical problems of disconnecting switches in Inner Mongolia, China within recent years. 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; as to the mechanical problems, the solutions include using dust shield, renovating operating mechanism and decreasing mechanically-driven part. In addition, we give other related suggestions to the design and application of disconnecting switches in Inner Mongolia as well as the Northwestern China where there is similar dust storm weather.