Phase sequence relay what role
Phase sequence relays can detect phase sequence and phase loss, three-phase voltage imbalance and other issues, and to protect. When you phase sequence is not correct when the open, or phase, three-phase voltage imbalance can be! The main or phase sequence
Its role ensures that the motor only allows a single direction to rotate.
Have the role of phase sequence protection
1. Specific function: When the phase sequence in the circuit does not match the specified phase sequence, the phase sequence relay will trigger the action, cut off the power supply of the control circuit so as to cut off the motor power and protect the motor.
2. Description of the working principle: a phase comparator composed of the player, compare the voltage amplitude, frequency level and phase. If the conditional amplifier is turned on, if there is a single condition, the amplifier is not attached. Phase sequence relay is mainly used for phase sequence detection or phase failure protection, when the phase sequence is correct, the relay action to obtain the output, when the phase sequence is not correct or any one of the AC circuit break when the relay lock. Under normal circumstances, the motor wiring sequence is specified, if for some reason, resulting in phase sequence disorder, the motor will not work or even damage. Three-phase power supply in the A phase, B phase, C phase, if the ABC phase sequence power supply access to the motor, the motor is forward, then ACB phase sequence power supply access to the motor, the motor is reversed. In order to prevent the motor reversal, joined the phase sequence relay, to prevent the incoming phase sequence phase reversal, resulting in motor reversal.
