The vacuum circuit breaker is a kind of switch equipment which is used in the middle-voltage field in the power system, which undertakes double tasks of controlling and protecting.

真空断路器是电力系统中压领域的一种开关设备，它担负着控制和保护的双重任务。

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There are some problems about the secondary voltage switching between voltage transformers of double bus. To solve these problems, a new method, soft switch of voltage, was proposed in this paper.

针对双母线电压互感器二次电压切换存在的问题，提出了电压软切换的新方法。

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