局部放电HF/UHF联合分析方法的现场电缆终端检测应用

使用局部放电检测方法检测高压电缆终端内的绝缘缺陷问题.根据高压电缆终端产生局部放电的不同信号传播特性,设计基于高频HF(High Frequencv)和超高频UHF(Ultra High Frequencv)检测原理的局部放电信号传感器以及便携式检测设备等,并开展现场电缆终端的局部放电在线检测.高频电流传感器可耦合接地线上流过的高频放电电流信号,而超高频传感器则感应空间传播电磁波信号.利用便携式检测设备实时采集数据结果,通过提取脉冲信号波形和多传感器信号联合比较分析等手段,对检测到的脉冲信号进行区分,排除外界干扰,分辨来自电缆终端内部的真实局部放电信号.现场检测结果表明,基于HF和UHF的局部放电联合分析方法,能够提高电缆局部放电辨别的准确性和有效性.

Application of HF/UHF joint partial discharge analysis to on-site power cable terminal detection

; The PD(Partial Discharge) method is employed to detect the potential insulation defect of high-voltage power cable terminal. According to the propagation characteristics of different PD signals,the PD sensors are developed based on HF(High Frequency) or UHF(Ultra High Frequency) detection principle,as well as the portable detection device. On-site test is carried out. The HF current transformer couples the PD current flowing through the ground strap and the UHF sensor is induced by the radiated the PD electromagnetic waves. The portable detection device is used to distinguish the real PD signals from interferences by pulse extraction and joint comparative analysis. The test results show that the HF / UHF joint analysis improves the effectiveness and veracity of PD identification.