同时如果电网负荷过重，还可能导致铁路和码头无法正常运行从而引起城市供电不足。
It also could clog railway lines and ports and trigger brown-outs as overloaded power grids collapse.
交流异步电动机频繁起动对系统造成很大的冲击，并影响其他负荷的正常运行。
Frequent starting and stopping of ac asynchronous electromotor will create a great impact on the system, and will influence the normal running of other loads of the system.
仅能在正常运行时断开负荷电流的开关。
Can only be disconnected in the normal run-time load current switching.
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