配电网在线监测的故障定位方法

为解决分支辐射型的中性点不接地配电系统的故障定位问题,提出了基于分布式探测器的在线监测故障的定位方法,并给出了探测器的具体研制方案。分布式探测器由电流测量终端、电流计算单元和GPRS无线通信装置构成。分布式探测器的电流测量终端获得的电流值通过射频方式发送给电流计算单元,计算所得零序电流值通过GPRS发送给监控中心,然后由监控中心的信息处理系统结合配电网网络结构对各分支点的零序电流大小进行综合分析,从而确定故障分支的位置。

Power distribution network fault locating by on-line detectors

A method of line-to-ground fault locating is proposed based on on-line monitoring by distributed detectors for ungrounded distribution network of radial lines.The detector consists of current measurement unit,current calculation unit and GPRS wireless communication unit.The three-phase currents are sent from current measurement unit to calculation unit via RF circuit, the calculated zero sequence current is then sent to monitoring center by GPRS.According to the topological structure of distribution network,the zero sequence currents of all branch points are analyzed by the information process system of monitoring center to locate the faulty branch.