Answer / jayakumar

In Star connected HT Motors , stator applied phase voltage
reduced by root 3 times so Current would be reduced
equivalent to this as well as stator Line current is equal
to phase current.
In Delta connected winding full line voltage(equal to phase
voltage) is applied on each phase so stator current would
be higher (root 3 times more than star connections).
The size of cable HT considerably reduced while on star with
delta connected motors.For star connection, the star point
easily brought out outside and make the connection by 3 nos.
HT bushings only for Delta 6 nos terminal bushings to be used.

Answer / gyanendra

In Star connected HT Motors , stator applied phase voltage
reduced by root 3 times so Current would be redueced
equivalant to this as well as stator Line current is equal
to phase current.
In Delta connected winding full line voltage(equal to phase
voltage) is applied on each phase so stator current would
be higher (root 3 times more than star connections).

Answer / pjs raju

In Delta connected winding full line voltage(equal to phase
voltage) is applied on each phase so stator current would
be higher (root 3 times more than star connections) SO


In Star connected HT Motors , stator applied phase voltage
reduced by root 3 times so Current would be reduced and
motor is better protected and low consumption losses.

Answer / t pandey

In star, phase voltage is reduced root3 times of applied
voltage thus creating less stress on winding of the
motor.Also reduced voltage can be controlled more safely.

Answer / arpit sood

one of the reason according to me should be that a motor
with star connection draws less starting current (5-8 times
less)
so if the motor is HV then there will be less voltage
fluctuation and less heating of the insulation of the motor
at starting
so the motor is better protected and does not start with a jerk


but generally the large motors are designed for delta
connection due to more mechanical power ( 3 times more than
the star connected) so there is need of auto transformer
starting

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