Analysis on dynamic dielectric recovery and statistical property of vacuum circuit-breakers with multi-breaks

Based on the analysis of dynamic dielectric recovery process on vacuum gaps in series, investigations were made on vacuum circuit breakers with double and multi-breaks. From the research on the breakdown weak points in high field vacuum gaps, their turn out and distribution, a theoretic model was set up for describing the statistical property of multi-breaks vacuum circuit-breakers, that can explain the mechanism on the improvement of breaking capacity for multi-breaks units compared with single-break ones which have the same equivalent gap length.