International Journal of Computer Science Issues

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Aiming at the problems of travelling waves speed velocity discontinuity problems in the hybrid transmission line composed by cables and overhead lines, a new method of two-terminal fault location based on the converted midpoint of the transmission line and HHT is presented in this paper. First, the hybrid transmission line was reduced to a single parameter line to get the midpoint of the line. Then, the HHT (Hilbert- Huang Transform) was used to detect the travelling waves heads. The search direction of the fault was calculated according to the time difference between two measurement endpoints from travelling wave of the fault point. The point when travelling waves moved /2 from the converted midpoint along the search direction was the fault point. The simulation results by ATP and Matlab show that this method is correct and accurate.