The topic is a smart three-phase AC voltage relay with a time delay function, the innovative use of the AVR microcontroller technology, high precision, high-return coefficient, in particular, has a strong anti-（外语学习 www.ncsmjj.com ）interference ability. By the voltage converter input AC voltage is converted to the small signal voltage into the CPU through the filter bias tuning voltage set by the CPU by collecting user, and then the actual voltage sampling value setting calculation, if the operating conditions exports corresponds to owe the amount of exports over relay.
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