Locating of the Earth Fault of the Single-Phase at the Tree Distribution Network

This paper proposes method through the combination of ranging the C-type traveling wave and the analysis and selection of line to the component of the line mode to locate the fault point. Inject into high amplitude and narrow signals in the beginning of a line and detect circuit returning from the arrival time of the waveform. Comparing of the normal waveform and failure waveform in both cases, receive the reflected wave fault at the arrival time. And then determine the fault distance. Using the effect from the fault which generate the shocks of the traveling wave and comparing the shock time of each branch line, the line which acquires the longest duration of vibration is the fault line. Through the theoretical analysis, Matlab simulation and effective analysis of the selected data, this paper proves the correctness of the method and demonstrate that the method of fault location in distribution networks is practical.