Answer / dinesh

As we know that the starting current of motor is high due
to absence of back EMF and low resistance of rotor. In
order to cotrol the starting current we use star coneection
for few time and than your mtotr runs in delta.

As we know that stating torque of induction motor is
directly proportional to square of supply voltage so your
voltage value becomes supply voltage/1.73 and stating
current is limited in star connection and then back EMF
comes into picture

Answer / mohamed ghanem

to limit the starting current

Answer / arul

To reduced that starting current. ( Or) to limit the starting current

Answer / kyle

It's commonly called a, "Soft start." Keeps from jolting the motor/pump/shaft.

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How are calculated the aluminium busbar cross section area?

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WHEN THESE TRANSFORMERS WINDINS CONFIGURATION ARE USED? SPECIALLY EXPLAIN REGARDING STEP UP AND STEP DOWN KEEPING IN MIND.AND REGARDING LOAD ALSO. a.star to delta b.delta to star c.delta to delta d.star to star ALSO EXPLAIN WHY V USE 415/415 TRANSFORMERS IN TUBEWELLS?

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3 Answers  

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