The Impact of Thermal Stresses on Volume Resistivity: Performance Comparison between TR-XLPE and XLPE Cables

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2021-12-12 DOI:10.1109/CEIDP50766.2021.9705437

Jasem Mohammed, S. Refaat, H. Abu-Rub, M. Olesz, J. Guzinski

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Abstract

Most failures in electric power cables are attributed to the development of water trees inside the insulating materials. Thus, the development and utilization of Tree Retardant Cross-Linked Polyethylene (TR-XLPE) based cables have recently been given great attention to overcome the treeing issues. TR-XLPE cables use low-density polyethylene compounds suppressing the formation of water trees while retaining excellent electrical, physical, and processing attributes. This paper investigates and analyzes the impact of thermal stress on a 33kV three-core power cable with TR-XLPE and XLPE insulations in the presence of different types, shapes and sizes of voids. The results have been obtained after 500 hours of the accelerated aging test. The obtained results confirm the superiority of TR-XLPE over XLPE cables in terms of retaining higher volume resistivity. Results obtained from simulations conclude that TR-XLPE insulated cable retains 6% more dielectric strength when compared to XLPE insulated cable.

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热应力对体积电阻率的影响:TR-XLPE与XLPE电缆的性能比较

大多数电力电缆的故障是由于绝缘材料内部的水树的发展。因此，开发和利用基于树木阻燃交联聚乙烯(TR-XLPE)的电缆是近年来备受关注的问题，以克服树形问题。TR-XLPE电缆使用低密度聚乙烯化合物抑制水树的形成，同时保持良好的电气、物理和加工特性。研究和分析了不同类型、形状和尺寸的空腔对TR-XLPE和XLPE绝缘33kV三芯电力电缆热应力的影响。经过500小时的加速老化试验，得到了结果。所得结果证实了TR-XLPE电缆在保持较高体积电阻率方面优于XLPE电缆。模拟结果表明，TR-XLPE绝缘电缆的介电强度比XLPE绝缘电缆高6%。

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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来源期刊

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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