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修复液的扩散行为对水树电缆修复后电气性能的影响机制

DOI: 10.13334/j.0258-8013.pcsee.2015.19.029, PP. 5095-5102

Keywords: 交联聚乙烯电缆,水树,修复,分子扩散,介质损耗因素,注入压力

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Abstract:

为了深入理解水树修复的机制,对交联聚乙烯(cross-linkedpolyethylene,XLPE)电缆水树修复技术的过程中,修复液在电缆内部的扩散行为进行研究,并重点分析修复液浓度在电缆轴向和径向的变化情况及其影响因素。首先使用水针电极法在XLPE电缆样本中加速水树缺陷的生成,随后利用压力注入式修复技术修复水树老化电缆样本,并测试电缆样本的介质损耗角正切值变化情况。同时基于有限元分析法,仿真修复液在XLPE电缆内部的扩散行为。根据修复液在长电缆内部轴向和径向扩散浓度的变化,提出了修复液的最小有效修复浓度。实验研究表明:修复后XLPE电缆样本的介质损耗角正切值在4~6h内迅速下降,并稳定在较低值;修复液的扩散浓度与电缆的横截面积及修复液的注入压力相关,呈正比例关系。随着注入压力的增大,修复液的扩散效率呈非线性增加趋势。修复液的扩散效率是影响水树老化电缆样本的电气性能变化的主要原因之一。

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