The inner overvoltage,such as power transient overvoltage,secondary arc current and switching overvoltage,are analyzed and countermeasures to limit the inner voltage are given.

• 针对内部过电压,分析了工频电压升高、潜供电流以及操作过电压所引起的问题,同时列出了各自可以采用的限制措施;