Development of a Novel Capacitive Partial Discharge Coupling Sensor for Cable Detection

The partial discharge detection is a proposed method to assess the insulation condition of the power cable. Conventionally used partial discharge couplers with narrow bandwidth can not meet the high sensitivity requirements of long cable testing. This paper presented a novel partial discharge coupler based on the RLC capacitive coupler. The designed coupler meets the requirements of higher low-frequency attenuation, lower passband frequency and high partial discharge detection sensitivity. The coupler is implemented and tested in the laboratory and the results are satisfactory.