Space charge behavior in polyethylene under AC electric fields

J. Zhao, Z. Xu, G. Chen, P. Lewin
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引用次数: 8

Abstract

Polyethylene has been widely used as the insulation of high voltage power cables due to its excellent dielectric properties and electrical performance. The existence of space charge in polymeric insulators is a significant issue with respect to life expectation. It can alter the local electric field and initiate possible partial discharge or eventual breakdown. This appears relatively more severe under dc applied fields than in the ac case. Research results have been extensively reported about space charge in polymers under dc electric stress. In contrast, space charge behavior under ac stress has not been fully examined or understood. However, the improvements in material processing and manufacturing have led to these materials being used under high ac electric fields. The effect of space charge under ac conditions can be an issue affecting the electrical performance of the material and needs to be carefully examined. At Southampton, a fast pulsed electro-acoustic (PEA) system equipped with 2 kHz HV pulse generator has been developed in order to acquire the fast dynamics of space charge in polyethylene under ac voltages. Space charge in low density polyethylene under ac voltages of 0.1 Hz to 50 Hz has been measured and detailed results are discussed in the paper.
交流电场作用下聚乙烯的空间电荷行为
聚乙烯由于其优异的介电性能和电气性能,被广泛用作高压电力电缆的绝缘材料。聚合物绝缘体中空间电荷的存在是影响绝缘体寿命的一个重要问题。它可以改变局部电场并引发可能的局部放电或最终击穿。这在直流电场下比在交流电场下显得更为严重。聚合物在直流电应力作用下空间电荷的研究成果已被广泛报道。相比之下,在交流应力下的空间电荷行为尚未得到充分的研究或理解。然而,材料加工和制造的改进已经导致这些材料在高交流电场下使用。交流条件下空间电荷的影响是影响材料电性能的一个问题,需要仔细检查。在南安普顿,为了获得交流电压下聚乙烯空间电荷的快速动力学,研制了一种配备2khz HV脉冲发生器的快速脉冲电声(PEA)系统。本文对0.1 ~ 50 Hz交流电压下低密度聚乙烯的空间电荷进行了测量,并对测量结果进行了详细讨论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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