Published:2012/12/4 20:47:00 Author:Ecco | Keyword: △ connection, motor, zero sequence, voltage relay, phase failure, protection | From:SeekIC
In the circuit shown in figure, three resistors R1 ~ R3 are connected as an artificial neutral point, when the motor is off-phase, the neutral point shifts, relay K is energized, the normally closed contact gets action to cut KM coil loop, KM loses power and releases, thereby protecting the motor.
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