Phase sequence relay working principle: A phase sequence comparator consisting of op amps, comparing voltage amplitude, frequency level and phase. If the conditional amplifier is turned on, if there is a condition that does not match the amplifier is closed.
Phase sequence relay for phase sequence protection:
The phase sequence protection can adopt the phase sequence relay. When the phase sequence in the circuit does not match the specified phase sequence, the phase sequence relay will trigger the action, and the power of the control circuit is cut off to achieve the purpose of cutting off the motor power and protecting the motor.
Under normal circumstances, the wiring sequence of the motor operation is specified. If the phase sequence is disordered for some reason, the motor will not work properly or even be damaged. Phase sequence protection is to prevent such accidents.
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