Power Supply
Electromechanical Relays
1. Phase sequence protection: After the phase sequence of the protector is confirmed if a phase line is arbitrarily exchanged the equipment will not be able to start and the protector plays a role in phase sequence protection. Phase sequence protection action time0.2s
2. Phase loss and voltage asymmetry protection: at the front end of the protector voltage sampling signals L1 L2 and L3 the voltage asymmetry of any phase or any two items in the three-phase power supply reaches 15% (ZYD1-B is 5%~ 20% adjustable) above the monitor acts reliably and the delay time is 3S.
3. Overvoltage and undervoltage protection: When the three-phase voltage is lower than the action value of the monitor the relay will delay protection and cut off the power supply of the equipment. Appropriate adjustment of the conditions of use. Overvoltage and undervoltage delay value: 3s~12s adjustable
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