摘要
监测局部放电是评价电力电缆绝缘状况的重要手段,而目前国内对电力电缆局部放电进行测量所用的系统频率较低,为此文中研究了用宽频带电磁耦合法来检测交联聚乙烯(XLPE)电力电缆的局部放电。它由Rogowski线圈型电流传感器、放大器、滤波器和数字示波器组成,带宽为1 MHz-20 MHz,符合宽频带检测的要求。对不同模拟缺陷和电缆上人为缺陷的检测表明,该方法与IEC 60270的方法相比具有一定的灵敏度,可以有效检测到局部放电信号,并且可以很好地识别出不同典型缺陷的局部放电。
Monitoring partial discharge (PD) is an important means to assess the electrical insulation condition ot XLPE, power cables. In China, the frequency of the method used in PD detection of the XLPE power cables is low. Hence an electromagnetic coupling method with wide frequency bandwidth is presented in this paper. The electromagnetic coupling system consists of Rogowski coil, amplifier, filter and digital oscillograph. Detection of several simulated defects and XLPE cables with artificial defects shows that this method provides fairly high sensitivity compared with the IEC 60270 method. This detection system can effectively detect PD signal and recognize different defects.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第5期59-62,84,共5页
Automation of Electric Power Systems
关键词
交联聚乙烯电力电缆
绝缘监测
局部放电
电磁耦合法
XLPE power cable
insulation-condition monitoring
partial discharge
electromagnetic coupling method
