Based on the wavelet decomposition of PD signal and white noise, a new method of transformer PD de-noising using the best wavelet for every layer is proposed.

• 在对局部放电信号和白噪的小波分解特性进行分析的基础上，以减小去噪对局部放电脉冲幅度误差和波形畸变为目标，提出了逐层最优小波算法。