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	Effects of space charges on DC breakdown in low density polyethylene
	Zhou Yuan-xiang ; Sun Qing-hua ; Wang Ning-hua ; Wang Yun-shan
	2010-10-12 ; 2010-10-12
关键词	Practical/ electric breakdown polyethylene insulation space charge/ space charges DC breakdown low density polyethylene electrical wires power cables polymeric insulating material prestressing effect breakdown strength/ B2830C Organic insulation B2810D Dielectric breakdown and discharges B2810E Gaseous insulation, breakdown and discharges
中文摘要	Polyethylene is widely used in electrical wires and power cables as a polymeric insulating material. To deal with the prestressing effect in polyethylene, effects of space charges on breakdown is studied. By applying a DC electrical field on low-density polyethylene (LDPE) specimens, space charges began to accumulate within the LDPE specimens. Then the DC breakdown strength of the specimens was measured within a short period of time after the electrical field was removed and the effects of space charges on DC breakdown in LDPE were analyzed. The experimental results showed that, compared with the DC breakdown strength of LDPE specimens without pre-stressing, the DC breakdown strength of LDPE specimens pre-stressed by a low field of 50 kV/mm, increased by 9% when the polarity of breakdown field was the same as that of the pre-stressing field, and decreased by 14% when the polarity was opposite to that of the pre-stressing field. Furthermore, when LDPE specimens were pre-stressed by a high field of 150 kV/mm, space charge packets came into being and traveled through the specimens, and after the electrical field was removed, the breakdown strength of homo polarity increased by 19%. However, the breakdown strength of hetero polarity did not decrease. Instead, it increased by 16% compared with that of LDPE specimens without pre-stressing. The results indicate that the movement of space charge packets in LDPE specimens bring the neutralization of part of the space charges and therefore decrease the accumulation of space charges in LDPE specimens. Meanwhile, the movement of space charge packets may contribute to the uniformity of the traps in LDPE, which is helpful to the increase of the breakdown strength.
语种	中文
出版者	Editorial Board of High Voltage Engineering ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/82451]
专题	清华大学
推荐引用方式 GB/T 7714	Zhou Yuan-xiang,Sun Qing-hua,Wang Ning-hua,et al. Effects of space charges on DC breakdown in low density polyethylene[J],2010, 2010.
APA	Zhou Yuan-xiang,Sun Qing-hua,Wang Ning-hua,&Wang Yun-shan.(2010).Effects of space charges on DC breakdown in low density polyethylene..
MLA	Zhou Yuan-xiang,et al."Effects of space charges on DC breakdown in low density polyethylene".(2010).

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