基于多端故障信息的配电架空线故障定位方法

Fault Location Method for Distribution Overhead Line Based on Multi-terminal Fault Information

针对多分支结构的配电架空线路故障定位困难的问题,依照分层开展、逐步锁定故障位置的定位策略,提出一套基于多端故障信息的配电线路故障定位新方法。首先分析故障初始行波到达线路不同末端的时差关系,归纳出其与故障位置间的内在联系,提出基于位置观测矩阵的架空线故障区域判定方法;然后从T型架空线结构入手,研究故障初测速度与实际波速度间大小关系所指示的故障区段特征,并提出基于波速度比较的架空线故障选段方法;最后进行双端行波测距,确定具体故障位置。PSCAD仿真结果证明,该套定位方法仅通过对多端初始行波时差的处理分析,即可获取较为准确的故障位置信息,方便有效。为配电架空线路故障定位提供了一种新方法。

In order to solve the problem of fault location of distribution overhead lines with multi branch structure,a new method of distribution line fault location based multi-terminal fault information was proposed in accordance with the positioning strategy of stratified and gradual locking of fault location.First,the time difference relationship between the different ends of the arrival line of the fault wave was analyzed,and the internal relation of the fault location was summed up.The fault region determination method of the overhead line based on the position observation matrix was put forward.Then,starting from the structure of the T-type overhead line,the relationship between the initial measurement speed and the actual wave velocity was studied.The method of fault selection for overhead lines based on wave velocity comparison was proposed.Finally,double-terminal traveling wave location was carried out to locate the specific fault location.The simulation results of PSCAD show that this set of positioning method can reliably locate the fault location,and can obtain more accurate fault location information by processing and analyzing the initial traveling wave time difference of multi-terminal.It is convenient and effective.Thus,it provides a new method for fault location of overhead distribution lines.