基于分布式行波检测的配电网单相接地故障定位方法

为解决复杂树型配电网长期存在的单相接地故障精确定位难题,分析了故障行波模量的传输特性,提出了一种基于两种行波原理组合的故障定位新方法。该方法首先建立多端定位算法查找故障主干线路,缩小故障定位范围;然后提出基于行波模量时差的双端定位算法,利用行波线模分量与零模分量的行波传输时差准确计算故障距离;最后,综合利用多端与双端定位结果确定故障精确位置。经仿真验证,该方法仅需在部分配电线路末端安装行波定位装置即可实现配电网全网线路的精确故障定位,有效节省了装置投资成本,具有数据处理量少、算法实现简单等优点。

A single-phase-ground fault location method for distribution networks based on distributed traveling wave detection

In order to solve the problem of long-standing single-phase-ground fault exact location in complex tree type distribution network, traveling wave modulus transmission characteristics is studied, and a fault location method combining two traveling waves theories is presented in this paper. Firstly, this method establish multi-terminal location algorithm to find out the fault trunk line and shrink fault location extent. Secondly, a double-terminal fault location algorithm based on the time gap between zero mode and aerial mode traveling is put forward to calculate fault distance. Finally, according to the information of multi-terminal and double-terminal fault location, fault point is determined. The simulation indicates that the location method can carry out accurate fault location with traveling wave location device on several ends of distribution network. It can save investment effectively and have advantages of little date load and simple algorithm implement.