现代电力2025，Vol.42Issue(2)：393-400,8.DOI:10.19725/j.cnki.1007-2322.2023.0089
XLPE电缆绝缘状态低频信号感应在线监测技术研究
Research on Online Monitoring Technology for XLPE Cable Insulation Characteristics Based on Low Frequency Signal Induction
摘要
Abstract
The real-time monitoring of power cable insulation status is of great significance to ensure its safe and stable opera-tion.To address the limitations of existing cable insulation on-line monitoring technology,in this paper we propose an online monitoring method for XLPE cable insulation based on low-frequency signal induction.Firstly,the basic principle of this method is introduced by an analysis on the low-frequency in-duction signal parameters and and optimization of the sampling methods.Then,an experimental platform is built to carry out online insulation monitoring for the artificially accelerated thermal aging cable and actual out-service cable.The results in-dicate that a signal,characterized by the voltage amplitude of 5 V and the signal frequency of 10 Hz,can be injected through the open triangle side of the potential transformer at the neutral point of the distribution network.This injection induces the zero-sequence voltage and current in the cable line,enabling accurate online measurement of cable insulation resistance,leakage current and dielectric loss factor.For the artificially ac-celerated thermal aging cable,the maximum error between the dielectric loss factors obtained by the low-frequency signal in-duction method and the offline polarization-depolarization cur-rent method is only 12.6%,and the results obtained by the two methods exhibit identical time-varying patterns.For the actual out-service cable,the test results of the low-frequency signal in-duction method are consistent with the actual operation status of the cable.The test results demonstrate that the low-fre-quency signal induction method can achieve accurate online measurement of cable electrical parameters,thereby satisfying the practical requirements of engineering application.关键词
XLPE电缆/电缆绝缘状态/低频信号感应/绝缘老化/在线监测Key words
XLPE cable/cable insulation status/low fre-quency signal induction/insulation aging/online monitoring分类
动力与电气工程引用本文复制引用
王尉军,陈旻,殷慧,李原,周凯..XLPE电缆绝缘状态低频信号感应在线监测技术研究[J].现代电力,2025,42(2):393-400,8.基金项目
国家自然科学基金项目(51877142) （51877142）
贵州电网科技项目(GZKJXM20210405).Project Supported by the National Natural Science Foundation of China(51877142) （GZKJXM20210405）
Guizhou Power Grid Science and Technology Project(GZKJXM20210405). （GZKJXM20210405）
