POWER SUPPLY DEVICE FOR MOTOR PROTECTOR AND POWER SUPPLYING METHOD THEREOF

The disclosure relates to a power supply device for a motor protector and a power supplying method thereof. The motor protector receives power by inducing alternating current in a power supply line of a motor via a power supplying coil and converting the induced alternating current into direct current utilizing a rectifier device. The power supply device comprises: a first power supplying unit, configured to receive and store the power and supply power to a tripping device of the motor protector; a second power supplying unit, configured to receive the power and supply power to a calculation and control device of the motor protector; a third power supplying unit, configured to receive and store the power and supply power to a reclosing device of the motor protector; and a control unit, configured to control an order in which the first power supplying unit, the second power supplying unit and the third power supplying unit receive the power, so that the power is firstly received by the first power supplying unit, and then received by the second power supplying unit and finally received by the third power supplying unit.