Although wavelet transforms(WTs) are being used to process fault signals of power system widely. Wavelet transforms can only filter white noises and are useless to filter colored noises.

• 小波变换在电力系统的故障信号处理中得到广泛地应用 ,然而 ,小波变换只能消除白色噪声 ,对有色噪声不起作用。