Improved condition assessment of XLPE insulated cables using the isothermal relaxation current technique

2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2006-10-01 DOI:10.1109/CEIDP.2006.311973

B. Oyegoke

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引用次数: 5

Abstract

Well-known procedures using the isothermal relaxation current method (IRC) use an empirically-derived ageing factor (the A-factor) to estimate the condition of cables. The A-factor is calculated from plots of the product of instantaneous value of IRC and the time to that value from the start of the current, against the log of time. A-factors are computed from a standard formula using constants determined from curve fits of measured depolarization currents. From measurements of the breakdown strength of samples of real and degraded cables it has been found that A-factors do not provide reliable estimates of XLPE cable condition. However, if semi-conducting material of the cable insulation is known and cables are classified according to semi-conducting material type it is possible to get better correlation between conditions of cables as indicated by A-factors and AC breakdown voltage. This paper contains a novel analysis of result from previous researcher and also includes result from tests on other cables. The refined procedure is found to give reasonable value of A-factor for all cable tested.

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用等温松弛电流法改进交联聚乙烯绝缘电缆的状态评定

众所周知，使用等温松弛电流法(IRC)的程序使用经验推导的老化因子(a因子)来估计电缆的状态。a因子是根据IRC的瞬时值与从电流开始到该值的时间的乘积图与时间的对数来计算的。a因子由标准公式计算，使用由测量的去极化电流曲线拟合确定的常数。通过对真实电缆和退化电缆试样的击穿强度测量，发现a因子不能提供可靠的交联聚乙烯电缆状态估计。但是，如果知道电缆绝缘的半导体材料，并根据半导体材料类型对电缆进行分类，则可以得到a因子所表示的电缆状况与交流击穿电压之间更好的相关性。本文包含了前人研究结果的新分析，也包括了其他电缆的测试结果。改进后的方法对所有电缆的a系数都给出了合理的值。

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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2006 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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