In this paper , the over voltage induced by re - ignition , rules of breakdown in vacuum contact clearance , factors which influence dielectric strength of clearance and characteristics of re - ignition when vacuum switchgear switch capacitor banks are analyzed . the conclusion is that the breakdown of clearance in vacuum interrupter is the direct cause which inducing re - ignition of vacuum circuit - breaker in capacitor banks ’ switch . particle breakdown is the essential reason to induce breakdown in clearance of vacuum interrupter , although mechanical characteristic of vacuum circuit - breaker is another factor 本文通过对真空开关投切电容器组重燃过电压、真空触头间隙击穿机理及影响真空间隙介质强度的因素、真空开关投切电容器组重燃现象特点进行分析研究发现,真空灭弧室断口的真空间隙击穿是导致真空断路器投切电容器组重燃的直接原因,其次是真空断路器机械性能的影响,而微粒击穿是导致国产真空灭弧室真空间隙击穿的根本原因。
