130kW induction motor synchronization control circuit operation

Circuit is shown. Motor using series resistance in the rotor winding start. Drawing, electrical velocity off the relay KIi ~ KI3 for motor short circuit protection; overcurrent

relay 1KI, 2KI electrically motive overload protection; voltage relay 1KA ~ 3KA and DC relay KAi ensure synchronous operation must have normal excitation voltage; loss step relay KA2 ensure that the motor in case of losing step into synchronous operation.

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