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The neutral point voltage open phase voltage relay protectio

2015-03-02 00:43  
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The neutral point voltage open phase voltage relay protection circuit
When any one phase of the motor three-phase power supply loses power, if the motor uses Y connection, wherein the neutral point (midpoint) voltage will be significantly improved. Therefore, the midpoint voltage can be used as off -phase fault signal. As shown in figure, the circuit uses voltage relay for protection device.