Research on the impact of current on partial discharge caused by surface defect of basin insulator in Gas Insulated Metal Eenclosed Switchgear

Based on the premise that whether the application of AC current will affect the discharge characteristics of partial discharge along the surface defects of basin insulators in GIS equipment, this paper conducts relevant research. A metal defect along the surface of basin insulators is set on the GIS equipment test platform, and AC voltage and AC current are applied to the test platform to measure the initial voltage of partial discharge and the changes in the development process of partial discharge. At the same time, the influence of applied voltage on the surface defect discharge characteristics of basin insulators when the AC current is applied for a long time is also studied. The results show that whether or not AC current is applied, the magnitude of AC current applied and the time of AC current applied have no obvious influence on the surface defect discharge characteristics of basin insulator in GIS equipment. The conclusion of the study has accumulated experience for the detection of surface defects of GIS equipment, and has a certain guiding role.