Analysis on switching overvoltage of 500 kV GIS disconnector

The 500 kV GIS disconnector of a pumped storage power station is detected to have the risk of operating overvoltage breakdown of the gas chamber. In this paper, the causes of the operating overvoltage of the disconnector of GI equipment are analyzed, and the insulation impact of the overvoltage generated during the operation of the disconnector at different positions on the adjacent equipment is studied, Finally, the possibility of reducing switching overvoltage by changing the contact of disconnector and adding closing resistance is introduced.