Influence of wave propagation process on measurement of corona current

In experimental investigation, the corona current is usually measured in the external circuit of the discharge gap. Different external circuit would make the measurement results different. To investigate the effect of the external circuits, this paper carried out a series of experiments and proved this effect was caused by wave propagation process. The influence of the sampling resistance and the length of the wire between the gap and the measuring point were analyzed. To eliminate this effect of the wave propagation process, this paper proposed a mathematical method with the deconvolution approach, which treated the whole experiment circuit as a linear time invariant system and solved the system function out. With this method, the accurate corona currents generated by the movement of the charges in the gap were calculated. After the effect of the external circuit was eliminated, the corona currents performed independent on the external circuits. The oscillation components of the voltage on the gap were also obtained in the computation.