The star triangle is started by changing the wiring mode of the three-phase winding of the motor. The autotransformer, the step-down start is a step-down start by reducing the voltage at the input end of the motor power supply through the transformer, and when the rated power of the motor is relatively large and the motor is star-connected, the star-delta step-down can not be used. The voltage ratio of the autotransformer can be changed so that the ratio can be set according to the torque required for starting, so that the step-down start is larger than the star-delta start. The star-delta step-down starts the motor below 7.5KW to realize the step-down start by changing the wiring mode of the three-phase winding of the motor. The motor above 7.5KW can only realize the decompression start by the compensation coil of the autotransformer.
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