Generator motor protection commutation method and device for pumped storage power station

The invention relates to a generator motor protection commutation method and device for a pumped storage power station. The method comprises the steps: determining an operation condition of a currentunit; and if the current unit is in the working condition of the motor, performing commutation on the machine end current, the machine end voltage and the neutral point current below a commutation switch according to the phase sequence of the commutation switch. According to the invention, when the unit is in a motor working condition, the machine end current, the machine end voltage and the neutral point current below the commutation switch are subjected to commutation according to the phase sequence of the commutation switch, and the phase sequence of the voltage or current after the commutation is consistent with that of the commutation switch, so that errors of data during protection logic judgment are avoided; reliability of unit protection is improved, and safety and stability of operation of the pumped stor