基于泄漏电流的电缆绝缘老化在线检测研究  

Research on Online Detection of Cable Insulation Aging Based on Leakage Current

作　　者：孙凯 雷享 李大银 钟天可 丁一 赵超 SUN Kai;LEI Xiang;LI Dayin;ZHONG Tianke;Ding Yi;ZHAO Chao(Huai′an Hongze District Power Supply Branch,State Grid Jiangsu Province Electric Power Co.,Ltd.,Huai′an 223100,China)

机构地区：[1]国网江苏省电力有限公司淮安市洪泽区供电分公司,江苏淮安223100

出　　处：《电工技术》2020年第15期111-113,116,共4页Electric Engineering

基　　金：省重点项目—主网微网一体化地区电网调控技术研究及应用资助(编号J2019106)。

摘　　要：针对城市电缆敷设环境的特殊性使得局部出现的绝缘老化无法有效检测出来的问题,提出一种基于泄漏电流的电缆绝缘老化在线检测方法。首先由首末端电流分离出反映电缆绝缘状况的泄漏电流,之后分析其与电缆老化长度和老化位置的关系,结果发现泄漏电流大小与电缆绝缘老化的位置关系较小,而与绝缘老化的长度呈正相关。进一步实现电缆绝缘的状况和绝缘长度的判断,为电缆线路的安全稳定运行提供新思路,仿真验证了该方法的准确性。Aiming at the problem that the particularity of the urban cable laying environment makes local insulation aging unable to be detected effectively,an online detection method for cable insulation aging based on leakage current was proposed.Firstly,the leakage current reflecting the insulation of the cable was separated from the current at the first end,and then the relationship between the leakage current and the aging length and location of the cable was analyzed.As a result,it was found that the leakage current had a small relationship with the position of cable insulation aging,but had a positive correlation with the length of insulation aging.It further realized the judgment of cable insulation status and insulation length,provided a new idea for the safe and stable operation of cable lines,and simulation verified the accuracy of the method.

关 键 词：电缆 泄漏电流 绝缘老化 老化长度 

分 类 号：TM855[电气工程—高电压与绝缘技术]