通过电压和电流互感器，获取供电系统的各相电压值和电流值，在精密整流的基础上，运用C8051 F330 D单片机对信号进行采样及外部通信，实现过电压、过电流、三相不平衡检测，从而实现对供电系统的保护。实验结果表明本设计灵敏度高，反应速度快，可靠性高。%With voltage and current mutual inductors ,we obtain the voltage and current for every phase of powersystem .Based on accu-rate reatification, the signals can be sampled by the C8951F330D microchip, which can communicate with external parts .The design can realize the measurement on over voltage , over current and unbalance in hopases ,and protect the power supply system .The experi-ment shows high sensitivity , rapid response and high reliabality in the system .
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