For starting of an induction motor, star/delta starting can be considered equivalent to an autotransformer starter with the ratio of

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For starting of an induction motor, star/delta starting can be considered equivalent to an autotransformer starter with the ratio of 57.7%. Star-delta starting is equivalent to an autotransformer starter with a voltage transformation ratio of 1:√3 or approximately 0.577. This means that the motor is initially started with a reduced voltage that is √3 times lower than the full voltage, and then after a certain period of time, it is switched to full voltage to run at full speed. This reduces the starting current and torque, and also reduces the mechanical and thermal stresses on the motor during starting.

For starting of an induction motor, star/delta starting can be considered equivalent to an autotransformer starter with the ratio of

33.3%

50%

100%

57.7%

The correct answer is `No. 4: 57.7%`

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For starting of an induction motor, star/delta starting can be considered equivalent to an autotransformer starter with the ratio of

33.3%

50%

100%

57.7%

The correct answer is No. 4: 57.7%

The correct answer is `No. 4: 57.7%`