Mutant Character Detection of Wavelet Transform in Power System Fault Signal

Wavelet transform,which has perfect time-frequency character,can adjudge both time and frequency windows automatically according to input signal frequency. Therefore it can be used to detect mutant points of input signals effectively. Based on wavelet transform theory,how to make use of high-frequency components of multi-scales to detect faults of power system in line is introduced. Finally,simulation researches and analysis proved the effectiveness of this algorithm.