Abstract: The accuracy of fault detection by traveling wave is a key for distance measurement on transmission lines. A new traveling wave detection method was proposed based on SRC (Sampling Rate Conversion) and LCD (Local Characteristic scale Decomposition), which considered quantization error reduction and the signal decomposition. The sampling rate of the current line mode components with fixed sampling rate was converted to realize resampling of reconstructed signal. The local characteristic scale of resampling signal was decomposed and the instantaneous frequency of the first intrinsic scale component was calculated by using Teager energy operator, which identified the moment of fault first traveling wave arriving detecting point. The fault location was calculated with three points traveling wave localization algorithm. Simulation results verify the proposed method validity and accuracy.

Key words: transmission lines, traveling wave location, quantization error, sampling rate conversion, local characteristic scale decomposition