The transition resistance of high impedance fault (HEF) in distribution network can reach thousands of ohms. The fault characteristics are weak, and it is easy to be confused with normal transient disturbances (NTD), such as no-load line switching, load switching, capacitor switching. Therefore, the fault detection is very difficult. In this paper, the difference of traveling wave full waveform energy distribution between HEF and NTD is deeply analyzed: the energy distribution of EHF is relatively uniform, and the degree of sparseness is small;...