快脉冲同轴场下间距变化的闪络分析

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Abstract Under nanosecond pulsed coaxial electric field, surface flashover voltage over interfaces between nylon 1010 and transformer oil almost linearly increases with gap length, and the steeper rising edge of pulse, the higher flashover voltage. Surface flashover properties are closely related to the electric field at the triple junctions of solid-liquid-electrode and the field gradient along the interfaces. Although the greater difference between inner and outer electrode radii enhances electric field strength at the triple junctions and nonuniformity of potential distribution along interfaces, it simultaneously terribly reduces the surface field strength of coaxial inner electrode, so that flashover voltage doesn’t decrease but almost linearly increases with gap length. It is indicated the average flashover strength in coaxial electric field can be estimated by that in uniform electric field for large enough gap。

Key words： Nanosecond pulses coaxial electrodes gap length surface flashover triple junction points surface potential

Received: 31 December 2008 Published: 07 March 2014

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	Huang Wenli
	Cui Jianfeng
	Sun Guangsheng

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Huang Wenli,Cui Jianfeng,Sun Guangsheng. Analysis on Flashover With Varying Gap Between Inner and Outer Electrodes Under Nanosecond Pulsed Coaxial Electric Field[J]. Transactions of China Electrotechnical Society, 2011, 26(2): 39-43.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I2/39

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