Power supply device for motor protector and power supplying method thereof

A power supplying method of a power supply device for a motor protector, 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, a second power supplying unit, a third power supplying unit and a control unit, the power supplying method comprising:

• by the first power supplying unit, receiving and storing the power and supplying power to a tripping device of the motor protector;
• by the second power supplying unit, receiving the power and supplying power to a calculation and control device of the motor protector;
• by the third power supplying unit, receiving and storing the power and supplying power to a reclosing device of the motor protector, wherein,
• the control unit controls 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 first power supplying unit, the second power supplying unit and the third power supplying unit do not receive the power at the same time, but that the power is firstly received by the first power supplying unit, then received by the second power supplying unit and finally received by the third power supplying unit.