Three coils voltage relay balance control broken phase protection circuit

Published:2011/8/30 20:47:00 Author:Christina | Keyword: Three coils, voltage relay, balance control, broken phase, protection circuit | From:SeekIC

As the figure shows, the electromotor M is operating normally, the three coils of the relay KV are connected with the three-phase AC voltage respectively, the total synthesis suction of the three coils is zero, the contact point will not act. When one of the phases cuts off, the three-phase AC voltage is in the unbalance state to make the voltage relay act, it cuts off the coil power supply of KM, the electromotor M stops operating. The shortcoming of this circuit is that it can not prevent the broken phase of the internal winding of the electromotor M.



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