低气压下绝缘子串直流污闪放电过程

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Abstract Pollution flashover accidents of insulators may threaten the operation safety of power system, whereas, the research on pollution mechanism is based on plate model by now. The paper studies the DC pollution flashover process of insulator string at low air pressure by high speed vidicon. The results suggest that the arising and developing of partial arc, which maybe multi-partial arcs, is stochastic during the DC pollution flashover process of insulator string at low air pressure. Some of the partial arcs may deviate from the surface of polluted insulator string and form the air gap arcs during the pollution flashover process. The partial arcs include two main parts: air gap arcs and surface arcs during the flashover process for the polluted insulator string. The flashover distance of polluted insulator string is shorter than leakage distance under low air pressure. The DC initial arc voltage of polluted insulator string is lower about 15～35 percent than flashover voltage. It is more easily arising partial arc for polluted insulator string under lower air pressure and more height of altitude and shorter time of arc burning. The figure of partial arc is related to pollution and air pressure and so on.

Key words： Low air pressure DC insulator string pollution flashover process partial arc

Received: 24 October 2007 Published: 13 February 2014

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TM855

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	Zhang Zhijin
	Jiang Xingliang
	Sun Caixin
	Hu Jianlin
	Yuan Jihe

Cite this article:

Zhang Zhijin,Jiang Xingliang,Sun Caixin等. DC Pollution Flashover Process for Insulator String at Low Air Pressure[J]. Transactions of China Electrotechnical Society, 2009, 24(4): 30-35.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2009/V24/I4/30

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