【摘要】 研究用小波变换提取高压变压器局部放电脉冲。针对载波通讯等缓变干扰，提出了三种基于小波变换的放电脉冲提取方法：二次小波变换法，小波反变换法和小波包变换法，并用仿真实验验证了三种提取方法的有效性，还给出了衡量提取方法有效性的几个概念。更多还原

【Abstract】 This paper investigates the extraction of partial discharge pulse in HV transformer basing on wavelet transforms. ln order to remove slowly changed disturbance, such as carrier disturbance, we present three extraction methods: secondary wavelet transforms, inverse wavelet transforms method and wavelet pack- ets transforms method. Meanwhile, simulation experiments are performed to confirm efficiency of three extraction methods. This paper also proposes some concepts for measuring efficiency of the extraction method.更多还原