Die should contain a minimum of one idle station to accommodate future design considerations. i.e. restrike cam pierce etc.

摸具应至少包含站以适应未来的设计变更，回整，凸轮，冲孔等。

In a10kV distribution system,when shunt ca-pacitors are switched off by vacuum circuit breakers,restrike overvoltage often occurs.

电力系中使用真断路器切除无功补偿用并联电器时,生重燃过电压,严重影响并联电的安全运行。