Fault location in power distribution based on travelling wave time-domain and frequency-domain analysis to identify the wave front

Time difference determination between the reflected waves from fault and other special points is a key point while using single terminal travelling wave to realize the single-phase earth fault locating, the accurate identification of the wave fronts from special points has not yet been solved well. In this paper, as the first step, the characteristic frequency associated to fault point is determined to get a relatively accurate fault distance from the measurement point based on analysis on transient signal originated from fault point by waveform-inferred mother wavelets at frequency domain. Then the fault distance got from former step is used as a clue for Daubechies(Db) wavelet analysis at time domain, arrival time of the wave fronts from the far terminal bus is accurately identified, then a more accurate fault location is achieved by time differences between initial wave front from fault point and that from far terminal bus of the fault feeder. Many simulations show that the procedure achieves a good fault location performance though integration of time and frequency analysis on transient signals.