基于低频信号注入法的电缆绝缘在线监测  

On-line Monitoring of Cable Insulation Based on Low Frequency Signal Injection Method

作　　者：奚航 周凯[1] 曾琴 饶显杰 陈玉豪 XI Hang;ZHOU Kai;ZENG Qin;RAO Xianjie;CHEN Yuhao(College of Electrical and Information,Sichuan University,Chengdu 610000,China;Southwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Chengdu 610021,China)

机构地区：[1]四川大学电气信息学院,四川成都610000 [2]中国电力工程顾问集团西南电力设计院有限公司,四川成都610021

出　　处：《绝缘材料》2019年第10期73-79,共7页Insulating Materials

摘　　要：本文提出一种基于介质损耗法的电缆绝缘在线监测方法--低频信号注入法,通过向电缆注入电压信号并测量其响应的低频介质损耗来判断电缆绝缘材料的老化程度。通过仿真和计算得到电缆低频介质损耗因数随电缆绝缘材料老化程度的变化规律,并通过低频介质损耗仿真试验对模拟计算结果进行验证。结果表明:对于不同故障的电缆绝缘,可以通过介质损耗因数的变化来判断其绝缘状况,因此通过低频信号注入法判断电缆绝缘状况是可行的。In this paper, an on-line monitoring method of cable insulation based on dielectric loss method, namely low frequency signal injection method, was proposed. The voltage signal was injected to the cable, and the dielectric loss at low frequency in response was measured to estimate the ageing degree of cable insulation material. The variation rule of dielectric loss factor at low frequency with the ageing degree of cable insulation material was obtained by simulation and calculation, and the simulation results were verified by simulation test of low frequency dielectric loss. The results show that the insulation conditions of cable with different faults can be estimated by the variation of dielectric loss factor. It is feasible to estimate the cable insulation condition by low-frequency signal injection method.

关 键 词：绝缘在线监测 电力电缆 低频信号 介质损耗因数 PSCAD 

分 类 号：TM215[一般工业技术—材料科学与工程] TM247[电气工程—电工理论与新技术]