基于差频法的XLPE电缆绝缘故障在线监测系统研究

Research on on-line monitoring system for XLPE power cable insulation fault based on differential frequency method

通过对电力电缆水树枝引起的绝缘老化原因的分析,提出了基于差频法的在线监测系统的设计方案.该方案将100 Hz左右的低频电压与工频交流电叠加,观察其对老化电缆的影响程度,从而对电缆绝缘的水树枝老化状态进行在线诊断.模拟实验得到了波形良好的低频劣化信号,达到了预期的检测效果,为安全、方便、迅捷地排除电缆故障提供了参考.

Throughout analyzing the XLPE power cable insulation aging caused by the water tree, the on-line monitoring system design based on the difference frequency is presented. The program is adopted by about 100 Hz low-frequency AC voltage and frequency superposition, observing the impact of aging cable, getting the cable insulation to the state of aging water tree on-line diagnosis. Simulation experiments have obtained good low-frequency waveform and achieved the expected results of monitoring.