高压XLPE电力电缆绝缘老化状态评价研究进展

Assessment of the insulation aging state of high voltage XLPE cables

高压交联聚乙烯(XLPE)电力电缆的绝缘老化状态关系到供电可靠性,故电缆绝缘老化状态检测及评价方法的研究意义重大。对于高压电缆的绝缘老化状态检测及评价,国内外已有相关研究成果,文中总结了目前常用的高压电缆绝缘状态离线、在线检测及评价方法。离线检测手段准确性高,但不适于对在役电缆进行大面积取样检测;在线监测的环境干扰因素太多,存在的干扰会对监测结果产生影响,有一定检测局限性,且缺乏大量的实验数据支撑;而对于电缆绝缘老化状态评价方法,尚未有广泛认可的评价标准和体系。文中在总结概述现有方法的基础上,提出了目前电缆老化绝缘状态综合评价方法存在的难点及未来电缆绝缘老化评价研究可提升的方向。

The insulation aging status of high-voltage cross linked polyethylene(XLPE)power cables affects the reliability of power supply.Therefore,it is of great significance to study the detection and evaluation methods of cable insulation aging status.The domestic and international researchers have obtained certain research results in the detection and evaluation of the insulation aging state of high-voltage cables.It is summarized the commonly used offline and online detection methods and insulation state evaluation methods for high-voltage cables in this paper.The offline detection method has high accuracy,but it is not suitable for large-scale sampling detection for the service cables.The online detection method is subject to many environmental interference factors,but the existing interference always affects the detect results.The online detection method has certain detection limitations and lacks a large amount of test data support.There is no widely recognized evaluation standard and system as the evaluation method for the aging state of cable insulation.On the basis of summarizing the existing methods,it is ponied out the difficulties of cable insulation aging state evaluation in this paper,thus putting forward the research direction that can be improved in the future.