Answer Posted / jishnu mukherjee

The main advantage is of-course the issue of starting current.In this case the starting line current is reduced to one third.Most importantly, starting torque is also reduced by the same amount.So pumps,motor-generator sets, where starting torque is not required to be high can take the advantage of star-delta starting.
But the problem is, this method is not adoptable for the motors which have high voltage rating(generally above 3kv).The reason behind:such motors are usually star-connected.We must have delta connection in the induction motor.

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