介绍了大型火电机组高压厂用母线切换时的情况，对大型异步电动机切换时的暂态过程进行了数学分析，介绍了减少切换时冲击电流的方法。
When the HV station service bus is switching, the transient of the large sized asynchronous motor is analyzed and a method of inducing the impulse current is introduced.
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。
There are some problems about the secondary voltage switching between voltage transformers of double bus.
电压软切换通过软件智能识别、选择工作母线，完成母线电压快速无触点切换。
Soft switch of voltage can identify and select working bus intelligently by software, and switch the bus voltage immediately without any contact.
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