Study on partial discharge detection system under oscillatory impulse voltage

In order to study the partial discharge (PD) pulses under oscillatory impulse voltage (OIV), an oscillation waveform generator is designed and the waveform parameter expressions are presented based on its equivalent circuit model. A high-frequency current transducer is developed for the measurement of PD. Then the effects of coil turns and integral resistance on frequency properties are studied. Moreover, calibration and analysis of the actual dynamic response are performed by adopting a function generator and a square-wave source. A PD measurement system that detects the PD signals of a needle-plate model under OIV was developed. Experiment shows that by adopting this PD measurement system, the source interferences are restrained and the PD signals are effectively extracted, therefore the proposed system could be a worthy approach not only to studying PD characteristics under OIV in depth, but also to exploring the mechanism behind it.