The advantage of using a star (wye) configuration over the delta configuration when the motor starts to run from standstill is on the difference in the behavior and relation of the voltage and current in the motor's internal coil winding when connected in star and in delta configuration.
|Fig-1: Delta Configuration Voltage and Current Relation|
|Fig-2: Star Configuration Voltage and Current Relation|
To check for the accuracy of the ampere values presented in the example, we can use the equation IL = IP*√3 provided in Fig-1 above for the delta configuration. We can solve for the line current drawn by the delta configuration by applying the current of the star configuration to the equation IL = 5,65 amperes*√3, which will give us 9,79 amperes.