Testing Voltage Waveform Analysis and Filtering Research on Portable Power Frequency Insulation Testing System

To eliminate the harmonics produced by DC/AC conversion of portable power frequency insulation testing system,which take the power from a storage battery,this paper employs the Fourier Transform to analyze testing voltage waveforms. For the harmonics of testing voltage,a kind of effective and active-passive hybrid filter is proposed,the experimental results show that the filter satisfies the demands for testing standard.