研究一种基于分布式光纤振动传感原理和电缆局部放电原理的电力电缆故障定位技术。通过在电缆上施加高压脉冲,使得电缆上有故障的位置产生局部放电,从而产生振动信号。并将放电脉冲信号同步传输给分布式光纤振动监测系统。通过分布式光纤振动传感技术来探测电缆沿线放电产生的振动信号,并对振动信号进行定位。将该故障定位技术应用于电力电缆沿线上监测电缆故障的状态分布,并进行试验验证。实验结果表明,该系统可实现监测多回路30 km电缆线路的故障分布状况,并对故障点进行准确定位。

The research on power cable fault location technology based on distributed optical fiber vibration sensing theory and cable partial discharge principle is carried out. By applying a high voltage pulse on the cable, the fault point in the cable is made to produce a partial discharge, thereby the vibration signal is generated. The discharge pulse signal is then synchronizingly transmitted to the distributed fiber vibration monotoring system. The vibration signal caused by discharge along the cable is detected by using the distributed optical fiber sensor technology, and thus the location of the vibration signal could be fixed. The fault location technology is used along power cables to monitor the cable fault state distribution, which is then verified by experiment. The results show that the system could achieve 30km multiloop cable line fault distribution monitoring and could locate the fault point accurately.