In D O l starter motor starts as a star connected ,then in star delta starter al

In D O l starter motor starts as a star connected ,then in star delta starter also motor initially starts as star how come star delta is preferred from dol

Question Posted / vijayaraghavan

2 Answers
3288 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

In D O l starter motor starts as a star connected ,then in star delta starter also motor initially s..

Answer / jayant mistri

It is not correct that in DOL starter, motor starts in star connection. But motor starts with Line voltage i.e 415 volts P-P in our country. It is the motor which is connected in star or delta connection from terminal box or in the motor winding.If motor is connected in star connection,each winding (R,Y and B phase) of motor, get phase voltage i.e. 230 volts (motor gives less power i.e. motor power /1.73). and if motor is connected in delta connection,each winding (R,Y and B phase) of motor, get line voltage i.e. 415 volts.motor gives rated power.

In star delta starter, motor start in star and changes to delta connection after time delay. In star connection motor draws less current as each winding gets 230 volts and when it goes to delta connection each winding get line voltage. thus star/ delta starter starts motor in reduced voltage so that motor draw less starting current. This starting is called reduced voltage starting.

Is This Answer Correct ?

2 Yes

0 No

In D O l starter motor starts as a star connected ,then in star delta starter also motor initially s..

Answer / k.prakashchandra

Instead of bulbs voltmeters can be employed

Is This Answer Correct ?

0 Yes

1 No

Post New Answer

More Electrical Engineering Interview Questions

at what basis/standard we have to arrive the current density of aluminium/ copper in busbar?