Partial Discharge Formation and Breakdown in Deionized Water under Repetitive Stressing

摘要

Partial discharges (PD) often precede breakdown in repetitively pulsed megavolt capacitors. This mode of breakdown is believed to result from ionization buildup in the electrode gap from which streamers originate. A series of partial discharge tests using a point-plane gap have demonstrated that streamers periodically grow out of ionized bushes which tends to support this model. The tests have also shown water to have well defined corona inception and quench thresholds as well as a low first-shot inception level. Data from these tests and related small area breakdown experiments are presented. The random breakdown and recovery characteristics of water are also discussed. (ERA citation 10:034382)