针对PLC柜上下两级断路器同时跳闸的问题，对上下两级断路器的特性进行了分析，利用断路器的脱扣曲线找到了问题原因，给出了解决的办法，并对上下两级断路器的设计提出了建议。%Aiming at the problem of simultaneous tripping of upstream and downstream circuit breaker in power supply System for PLC,analyze the character of upstream and downstream circuit breaker,find the cause of the problem with circuit breaker tripping curves, gives the solution, and the design proposal of upstream and downstream circuit breaker were put forward.
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