Study On The Method Of Single-phase-to-earth Location For Rural Distribution Networks

In this paper, base on analyzing characteristics and problems of the rural distribution networks, the traditional fault location methods are analyzed, especially the C-type traveling wave location method, a composite fault location method is presented which integrate C-type of traveling wave location method with DC signal injection method. The aim is to combine different location methods to improve the accuracy of fault location. During the research, a lot of simulation about single-phase-to-earth fault for rural distribution networks using ATP-EMTP software, and the effect of the different source and different resistance is in-depth researched. The method put forward in this paper is impact of the grounded position and line dissymmetry, and is irrelevant to limits of the distributed capacitance and line parameter, can accurately find the fault point of an off-line 10kV distribution line after a single-phase-to-earth fault.