操作冲击下空间电荷对间隙放电的影响

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Abstract Shielding failure is the main reason for tripping operations of EHV and UHV transmission lines, and many scholars believe that space charge may be one of the causes of these shielding failure accidents. In order to further study the influence of space charge on lightning discharge, a board-needle air gap of 100cm was set up. Under the positive and negative switching impulse voltage, the discharge process of the gap was observed by a high speed video camera system. So as to analyze the influence of the space charge on the discharge development quantitatively, the current through the positive board-needle air gap was measured. Then the charge current was extracted, and the integral of the charge current was calculated to evaluate the amount of space charge. Experimental results show that discharge always develops from the positive electrode to the negative electrode, under both positive and negative switching impulse voltage. Besides, under the positive switching impulse voltage, with the radius of curvature of the head part of the needle increasing, the percentage of discharge striking points on the head of the needle decreases. What's more, under the same test conditions, the amount of the space charge of the board-pointed needle is the largest. With the radius of curvature of the head part of the needle increasing, the amount of the space charge becomes smaller.

Key words： Switching impulse space charge high speed video camera discharge striking points

Received: 13 April 2012 Published: 18 June 2014

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TM835

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	Articles by authors
	Zhan Huamao
	Liu Bo
	Yan Tingli
	Deng Lihong
	Li Chengrong

Cite this article:

Zhan Huamao,Liu Bo,Yan Tingli等. Influence of Space Charge on Air Gap Discharge Under Switching Impulse[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 212-218.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I2/212

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作者简介:詹花茂女,1976年生,博士,副教授,主要研究方向气体放电与电力系统过电压。刘波女,1987年生,硕士研究生,主要研究方向气体放电与电力系统过电压。