配电线路接地故障的探测及定位方法

Detection and Location Method of Ground Fault of Distribution Lines

配电线路接地故障给供电可靠性带来较大影响,常规查找方法存在用时长、劳动强度大、效率低等缺点。小电流接地选线与定位保护装置能根据线路接地时变电所母线上电压互感器的电压变化确定接地相,在注入特殊频率的信号电流后,使用电流探测器采用二分法确定故障最小区域,再利用其定位功能就可快速、准确地找到故障点,以达到尽快恢复供电的目的。

The ground fault of distribution lines has great influence on the reliability of power supply,and the conventional searching method has disadvantages such as long operation time,high labor intensity and low efficiency.The ground line selection and location protection device for small current can the ground phase and inject signal current with special frequency according to the voltage change of the voltage transformer in the transformer substation bus when the line is grounded.The current detector,using the dichotomy,is used to determine the fault minimum area,and then its location function is used to quickly and accurately find the fault point.By doing so,the purpose of restoring power supply can be achieved as soon as possible.