How to connect star delta step down starting control circuit of three phase asynchronous motor

How to connect star delta step down starting control circuit of three phase asynchronous motor

Because the starting current of the three asynchronous motors is 4 to 7 times of the rated current, the starting current should be limited, so the step-down starting is adopted
The methods of step-down starting are: star delta step-down starting; series reactor step-down starting; series self couple voltage regulator step-down starting~