染污绝缘子串直流污闪放电模型及验证

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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. Take seven units of XP-160 for example, the paper studies the DC pollution flashover model of polluted insulator string. The electrical circuit model explaining the DC flashover process of polluted insulator string is put forward in this paper, which consists of a surface arc, air gap arc and residual resistance of the pollution layer. The relative error of critical pollution flashover voltage obtained by the model and the experimental result is in seven percent. It also shows that the thermal buoyant force may take dominant action when the leakage current is larger than 200 milliampere during the flashover process for the polluted insulator string and thus explains the reason that the partial arc may derive from the surface of insulator.

Key words： DC insulator string pollution flashover model leakage current

Received: 21 November 2007 Published: 13 February 2014

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TM855

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	Articles by authors
	Zhang Zhijin
	Jiang Xingliang
	Sun Caixin
	Hu Jianlin
	Yuan Jihe

Cite this article:

Zhang Zhijin,Jiang Xingliang,Sun Caixin等. DC Pollution Flashover Model and Its Validation of Polluted Insulator Strings[J]. Transactions of China Electrotechnical Society, 2009, 24(4): 36-41.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2009/V24/I4/36

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