气体绝缘组合电器中微米量级金属粉尘运动和放电特征

doi:10.19595/j.cnki.1000-6753.tces.190487

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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 F_q and the gas resistance F_v 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.

Key words： Gas insulated switchgear metal dust motion regularity adsorption regularity discharge characteristic

Received: 25 April 2019 Published: 17 January 2020

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TM85

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	Zhang Liangen
	Lu Shijie
	Li Chengrong
	Cui Boyuan
	Wu Yuyi

Cite this article:

Zhang Liangen,Lu Shijie,Li Chengrong等. Movement and Discharge Characteristics of Micron-Scale Metal Dust in Gas Insulated Switchgear[J]. Transactions of China Electrotechnical Society, 2020, 35(2): 444-452.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190487 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I2/444

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