Movement and Discharge Characteristics of Micron-Scale Metal Dust in Gas Insulated Switchgear
Zhang Liangen1, Lu Shijie1, Li Chengrong1, Cui Boyuan2, Wu Yuyi2
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China; 2. High Voltage Research Institute China Electric Power Research Institute Beijing 100192 China
Abstract:Metal particles are one of the main threats to the insulation safety of gas insulated switchgear (GIS). Previous studies on metal particles focused on millimeter-scale, but pollutants dropped by contacts frictionally are on the order of micrometers. Therefore, it is necessary to study the motion behavior and discharge characteristics of metal dusts. In this paper, a 126kV 21 scaled GIS platform was built. The motion images and adsorption images of the insulator surface and cavity subface were recorded. Discharge pulse current was recorded during the moving and adsorption phases. The results showed that the metal dust had a diffusion motion in the axial and tangential directions in addition to the radial runout. After a few minutes, the dust stopped moving and formed absorption in the cavity. In the adsorption statistics of the insulator surface, the longitudinal distribution was relatively uniform, while the radial distribution on the outer region was slightly higher than those on the middle and the inner regions. The distribution on the cavity subface was negatively correlated with the electric field strength, and the weak electric field region was more likely to adsorb and accumulate dust. The discharge signal could be measured during the dust moving phase, but no signal could be detected after adsorption within 72 hours. The dust force analysis was carried out. It is demonstrated that the Coulomb force Fq and the gas resistance Fv are the dominant factors of movement. The van der Waals force is the cause of dust adsorption on the cavity subface, while the adsorption of the insulator surface is combined effect of the mirror force and van der Waals.
张连根, 路士杰, 李成榕, 崔博源, 吴昱怡. 气体绝缘组合电器中微米量级金属粉尘运动和放电特征[J]. 电工技术学报, 2020, 35(2): 444-452.
Zhang Liangen, Lu Shijie, Li Chengrong, Cui Boyuan, Wu Yuyi. Movement and Discharge Characteristics of Micron-Scale Metal Dust in Gas Insulated Switchgear. Transactions of China Electrotechnical Society, 2020, 35(2): 444-452.
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