用二进小波变换分析变压器中含强载波干扰的局部放电

DETECTION OF PD SIGNAL WITH STRONG CARRIED WAVES DISTURBANCE IN POWER TRANSFORM ER BY DYADIC WAVELET TRANSFORM ATION

介绍了二进小波变换的基本原理及其滤波特征,采用二进小波函数对变压器中含强载波干扰的局放信号进行了小波变换。仿真结果表明,二进小波变换能消除强载波干扰,能准确地检测出局放脉冲信号的幅值及其发生的时刻。

In this paper the wavelet transformation theory is simply introduced.The dyadic wavelet transformation is adopted for detect the partial discharge pulse in power transformer.Simulation results show that the wavelet transformation can eliminate the strong carried wave disturbances and detect the amplitude of the partial discharge as well as the time of its occurrence.