Abstract:

The characteristic of a single-phase grounding fault were analyzed, and the optimal high-frequency signal was proposed, then a new adaptive fault line selection method based on multi-scale wavelet packet decomposition was proposed, which had excellent focusing property in time-frequency space. This method used the multi-scale wavelet packet decomposition, rather than fixed scale, which could significantly improve the robustness of the fault line algorithm. Simulation results showed that the combined criterion had higher accuracy and credibility than that of  traditional methods.

Key words: wavelet packet, multi-scale decomposition, Non-solid earthed network, fault line selection