Resistor-capacitor phase failure protection circuit
Source: InternetPublisher:念念Brown Updated: 2013/08/08
The circuit shown in the figure uses the negative sequence voltage generated by the unbalanced three-phase power supply for phase failure protection. When the three-phase power supply is symmetrical and the line voltages lag each other by 120o electrical angle, the voltage at both ends of the voltage relay KV is 0V, so KV does not operate. When one phase of the three-phase power supply is interrupted, voltage is applied to both ends of the KV coil, KV pulls in, its normally open contact acts, and the KM2 coil circuit is connected, KM2's normally closed contact acts, and KM1 cuts off the motor M power supply. Latest Control Circuits Circuits
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