配电线路单相接地故障定位的研究

Research on Location of Single-phase-ground Fault in Distribution Network

在基于行波法的配电网故障定位中,每遇到一个分支点行波幅值就会有一定程度的减小,在经过若干分支点后,可能导致返回的行波信号太小以致无法辨识,从而造成行波法失效。文章在对行波传输特性分析的基础上提出了一种新的故障定位方法。该方法通过对主线路和每条分支线路单独进行检测来确定故障点,其优点是能够避免行波信号过分衰减,定位准确可靠。最后通过ATP仿真证明了该方法的有效性。

The amplitude of wave will be reduced to some extent when the branch point is encountered in the process of fault locating which bases on traveling wave method in distribution network. After passing a certain amount of branch points the returning wave may be too small to be recognized and then travelling wave method may fail. This paper presents a new fault location method after the analysis of the wave transmission characteristics. In this method, the main line and branch lines were analyzed separately to determine the point of failure. This method can avoid excessive attenuation of the signal wave so it can locate the fault point accurately and reliably. At last the effectiveness of the method is verified by ATP simulation.