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This is method to start a motor using an autotransformer.
As an autotransformer acts as a reactor if neutral point is open without separating an autotransformer after starting, a motor starts while rated voltage is induced when a tap is short-circuited.
The feature of this method is that shock is reduced as power and a motor are not separated when a tap is changed into a direct line. Therefore this is commonly used to start a large capacity motor with high starting torque and GD2 value of load.
ㆍ Calculation of capacity of a Kondorfer
ㆍ Starting method of a Kondorfer