Research on Characteristics of Partial Discharge and Movement of Conductive Particles in GIS

Abstract

Gas insulated switchgear (GIS) will cause electric field distortion due to the existence of free metal particles, causing partial discharge and breakdown inside the GIS. In order to study the movement status and partial discharge characteristics of different metal particles in GIS, under different pressure conditions, linear metal particles of different lengths and numbers are put into the same position of 126kV GIS, the partial discharge signal is measured by UHF method and high-speed camera is used. Observe its movement characteristics. The initial discharge voltage, number of discharges and discharge amplitude obtained are compared, combined with the analysis of particle movement, the results show that for free linear metal particles, the maximum discharge amplitude, average discharge amplitude and discharge times are After lifting the voltage, the maximum discharge amplitude did not change significantly. The average discharge amplitude and the number of discharges first decreased and then increased. After the particle jumped, the number of beatings increased with the length of the particle. The discharge amplitude is positively correlated with the number of discharges and particle length, and negatively correlated with pressure, and the average discharge amplitude tends to saturate with the increase in pressure; there are three modes of movement of multi-metal particles in GIS, the average discharge amplitude There is a positive correlation between the number of discharges and the number of particles.