Combined with engineering examples , analyzed the working principle of large -capacity high-speed switch .Its advantages and disadvantages were discussed .The selection of large-capacity high-speed switching device reference opinions were put forward .%结合工程实例分析了大容量高速开关的工作原理，针对其优缺点进行了探讨，对大容量高速开关装置的选用提出了参考意见。
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