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The characteristic of single-phase grounding fault and the signal of optimal high frequency region is analyzed in this paper. A new adaptive fault line selection method based on multi-scale wavelet packet decomposition is proposed. Wavelet packet decomposition has excellent focusing property in time-frequency space, besides the method uses multi-scale wavelet packet decomposition rather than fixed scale, so the method can improve the robustness of the fault line algorithm easily. The simulation results show the high accuracy and credibility.
Date of Conference: 28-31 March 2010