温度梯度场对高直流电压下聚乙烯中空间电荷及场强畸变的影响

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Abstract Temperature gradient across cable thickness is caused by Joule heat originating from the current in the HV cable conductor, which must influence the injection and migration of charge, lead to the gradient of insulation resistance and then the gradient of electrical field. As a result, the lifetime of cable is decreased due to charge accumulation and stress distortion at the outer surface of insulation. So, it is a high theory and engineering values for new direct current (DC) cable insulation design to study the space charge accumulation and stress distortion in cable insulation under DC stress and temperature gradient. In this paper, space charge profiles and field distributions of polyethylene (PE) with thickness of 0.5mm are measured under the different temperature difference(Δ T=0～40℃), when DC stress of 70kV/mm is applied. The test results show that the maximum electrical field reaches 230kV/mm, that is, increases 2.28 times when the temperature difference is 40℃. At the same time, the maximum electrical field increases linearly with the temperature difference.

Key words： Polyethylene space charge temperature gradient DC stress distortion

Received: 11 September 2009 Published: 07 March 2014

PACS:

TM215.1

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	Chen Xi
	Wang Xia
	Wu Kai
	Peng Zongren
	Cheng Yonghong

Cite this article:

Chen Xi,Wang Xia,Wu Kai等. Space Charge Accumulation and Stress Distortion in Polyethylene Under High DC Voltage and Temperature Gradient[J]. Transactions of China Electrotechnical Society, 2011, 26(3): 13-19.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I3/13

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