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The phase sequence detection circuit is used to detect the voltage and phase of the three-phase power supply. When the three-phase power supply is abnormal, the phase sequence detection circuit outputs a signal to the processor. After receiving the signal, the processor immediately executes the circuit to the relay. Output a disconnection signal, thereby controlling the disconnection of the action control mechanism.
When the three-phase voltage of the power grid is seriously unbalanced, the phase is broken, the phase sequence is wrong, the neutral line is repeatedly grounded, a certain phase of the power grid is short-circuited and grounded, and the person touches any phase of the other two phase lines of the power grid, resulting in protective measures. In case of failure and endangering personal safety, the phase sequence protection relay can quickly act to trip and cut off the power supply.
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