Abstract: The DC/AC excitation of the oscillating wave of the cable of the partial discharge detection system has problems with cost input and examination accuracy. This paper studied an AC excitation of the oscillating wave of the cable of the partial discharge detection system based on the series resonance system.It reformed the series resonant testing equipment. The end of the HV excitation paralleled the solid-state switch with high voltage and high power and integrated and packaged with the frequency converter.The tested cable, resonance reactor, and circuit resistance formed damped oscillation when the main engine controlled switch of the frequency converter closed, stimulating the potential defects of the cable and producing partial discharge.This paper realized the voltage monitoring of the cable by using a special voltage divider. In addition, it collected the partial discharge signals and sent the signals to the special analysis terminal.The results show that the new oscillation wave partial discharge detection system would not cause the accumulation of insulative electric charge of the cable by using AC voltage excitation. It could complete AC withstand voltage test while conducting the oscillating wave partial discharge detection, and discover the potential defects of the cable.

    Key words: cable; series resonance system; AC excitation; oscillation wave; partial discharge