The effect of included flaws upon the AC breakdown of polyethylene

Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics Pub Date : 1989-07-03 DOI:10.1109/ICSD.1989.69161

R. Coppard, J. Bowman, R. Rakowski, R.T. Durnham, S. Rowland

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引用次数: 1

Abstract

The effect of aluminum and HMWPE (high-molecular-weight polyethylene) gel particles on the AC breakdown strength of a cable-grade low-density polyethylene (LDPE) is quantified. Despite extreme care, it was found to be impossible to process ultraclean LDPE in small batches and maintain its electrical breakdown performance. Sufficient cleanliness was achieved for the LDPE to exhibit a measurable deterioration of performance upon the addition of aluminum particles in the range 38-53 mu m but not in the range 15-38 mu m. Above this size range a strong dependence of breakdown strength on particle size and defect concentration is reported. In material containing aluminum particles it has been suggested that two types of behavior can be discerned. One of these was attributed to individual particles and led to high-field failures. The second was attributed to their anomalous defects or to intentionally added defects acting cooperatively and caused low field failures. In the present study no clear trend in behavior was observed upon addition of gel particles. In some cases the control material was improved by the addition, a result that is tentatively attributed to changes in polymer morphology.<>

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含缺陷对聚乙烯交流击穿的影响

研究了铝和高分子量聚乙烯凝胶颗粒对电缆级低密度聚乙烯(LDPE)交流击穿强度的影响。尽管非常小心，但发现不可能小批量加工超净LDPE并保持其电气击穿性能。在加入38-53 μ m范围内的铝颗粒时，LDPE达到了足够的清洁度，表现出可测量的性能下降，而在15-38 μ m范围内则没有。在此尺寸范围以上，击穿强度与粒度和缺陷浓度有很强的依赖性。在含有铝颗粒的材料中，有人认为可以分辨出两种类型的行为。其中一个是由单个粒子造成的，导致了高场失效。第二种是由于它们的异常缺陷或故意添加的缺陷协同作用而引起的低场故障。在本研究中，没有观察到添加凝胶颗粒后行为的明显趋势。在某些情况下，对照材料通过添加得到改善，这一结果暂时归因于聚合物形态的变化。

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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Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics

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