基于脉冲电压法的XLPE电缆水树劣化诊断研究

Diagnosis of Water-tree Degradation in XLPE Cable Based on Pulse Voltage Method

本文提出了基于脉冲电压法的XLPE电缆水树劣化诊断方法,并采用脉宽为1~10 ms的高压脉冲对人工水树劣化XLPE电缆及6.6 kV自然劣化XLPE电缆进行检测和验证。结果表明:采用脉冲电压法成功检测到了与水树劣化有关的电流信号,脉冲电压的平均效应提高了与水树相关的信号的检测灵敏度,但是该方法对自然水树劣化电缆的测试结果与传统方法存在差异,这可能与水树的类型、形态及深度等有关。

A diagnosis method of water-tree degradation in XLPE cable was proposed based on pulse voltage method,and an artificial water-tree degraded XLPE cable and a 6.6 kV naturally degraded XLPE cable were tested and verified by the high voltage pulses with 1~10 ms of pulse width.The results show that the current signals related to water-tree degradation are detected successfully using pulse voltage method,and the detection sensitivity of signal related to water-tree is improved by the average effect of pulse voltage.While there are differences between the test results of pulse voltage method and traditional method for the natural water-tree degraded cable,which may be related to the type,shape,and depth of water trees.