A three-phase motor phase automatic protection circuit

  
Penetrate the motor phase line with a transformer when the induced voltage is ov. When one phase or two-phase or three-phase serious imbalance, transformer induced voltage rises rapidly, resulting in the transistor base current after rectified immediately
A three-phase motor phase automatic protection circuit - schematic

transistor saturated conduction, the relay K was electric suction units, normally closed contact off point, the contactor coil is oFF, touch -break, loss of power the motor stops running. Operating time is less than 1 second.




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