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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 is an important means to evaluate the insulation status of power cables. At present, the frequency of system used to measure partial discharge of power cables in China is relatively low. In this paper, the study on the detection of cross-linked polyethylene (XLPE) Partial discharge of power cables. It consists of Rogowski coil current sensors, amplifiers, filters and digital oscilloscopes with a bandwidth of 1 MHz to 20 MHz, which meets the requirements of wideband detection. The detection of different simulated defects and man-made defects on the cable shows that this method has certain sensitivity compared with the method of IEC 60270, which can effectively detect the partial discharge signal and can well identify the partial discharges of different typical defects.