Safety Analysis of Inner Capacitive Coupling Partial Discharge Sensor for 10kV Cable Joints under Lightning Impulse

The inner capacitive coupling partial discharge sensor for cable joints is of high sensitivity and wide detecting bandwidth, but can be coupled to a dangerously high voltage under lightning impulse with lots of high frequency components. In this paper, an equivalent circuit model was built up to simulate the coupling potential of sensor under lightning impulse. Subsequently, an inner capacitive coupling sensor applied for partial discharge...