GIS discharge induced by vibration, metal particles and VFTO

Some GIS break down after the disconnector is operated. The reason for this phenomenon is not clear. We believe that the vibration and VFTO caused by the disconnector action, as well as the metal particles inside the GIS, together cause this phenomenon. In order to confirm our idea, we carried out simulation calculation and experimental verification. In this paper, we present the methods and results of experiments and simulation calculations. The research results show that the vibration and VFTO caused by the disconnector action greatly increase the lifting height of the metal particles inside the GIS, which may be the main cause of breakdown and discharge. On this basis, we propose a test method for synchronous disconnector action during the withstand voltage test to improve the detection rate of metal particles.