Breakdown Mechanism Based on Secondary Streamer Propagation and Channel Heating under Non-uniform Electric Field in Air

Under non-uniform electric field with relatively short gap in air, we have clarified in the past that the breakdown occurs due to secondary streamer channel heating. In this mechanism, the arrival of secondary streamer to grounded plane electrode is one of the necessary factors. In this paper, we discuss the influence of secondary streamer propagation and channel heating on breakdown occurrence for different non-uniformity in electric field distribution. As a result, in the case of lower non-uniformity, the secondary streamer can easily propagate to the grounded plane electrode. This is because the back electrode behind the high voltage electrode enhances the electric field at the streamer head in the gap space. However, since the arrival of secondary streamer to the plane electrode does…