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  1. I

    3-phase voltage monitor, phase reversal

    I got the scheme from a 380VAC voltage monitor, where the device has the ability to detect phase reversals and detect voltage levels. I have tried simulating in LTSPieceXVII and giving a 1.7V DC voltage to the output. But I don't know how this circuit works and the formula is mainly on R1, R2...

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