Answer / a. v. ramana reddy

A star connected motor takes less current compared to a
delta connected motor since the phase current is 1/sqrt3
times the line current, but torque developed by the motor is
affected, since starting current is heavy in order to reduce
the heavy inrush current we place a star delta
starter.....so tat starting current can be comparitively
small...the reason for shifting to delta connection(after
motor attains 80% of the rated speed)is the power output of
the motor wil be 3 times the output wen it is connected in
star.....it doesn;t mean tat the m/c 3 times more efficient
than star connected one..but correspondingly the power drawn
by the motor also increases.........
comments r welcome....

Answer / s.r.ramalingam

PHASE CURRENT AND PHASE VOLTAGE IS THE MAJOR DIFFERENCE...

IN STAR CONNECTION,
PHASE CURRENT IS EQUAL TO THE LINE CURRENT.
THT IS,
I LINE = I PHASE
BUT,
V LINE = ROOT 3* V PHASE

IN DELTA CONNECTION,
PHASE VOLTAGE IS EQUAL TO THE LINE VOLTAGE.
THAT IS,
V LINE = V PHASE
BUT,
I LINE = ROOT 3* I PHASE.

Answer / killer

In star connection motor is taking low current and produce
high torque and in delta connection motor is taking high
current and low torque.to start the motor from stand still
condition we requeired high torque so first motor should in
star connection and then it should have conti. with delta
connection.

Answer / joseph james

In star connected motors power consumption will be less
compared to delta connected motors.

Answer / krishna

star connected motor gives a more torque compare to delta
connected.

Answer / k.mohan kumar

In star connection motor is taking low current and produce
high torque.
In delta connection motor is taking high current and
produce low torque.
In star more power consumption.
In delta less power consumption.
In star connection phase current is equal to line current.
In delta connection phase voltage is equal to line voltage.
In star line voltage is equal to 1.732*phase voltage.
In delta line current is equal to 1.732*phase current.

Answer / lovepreet

Bt how it is possible that in star connected motor takes less current nd produce more starting torque than delta connected motor while speed is same????

Answer / arthur

Delta connection has a high starting torque which is not our interest since it comes with extremely high current. To reduce this current which only occurs during starting,we use star with relatively low current and low torque.

Answer / yasirfraz

STAR CONNECED MOTER TAKE LESS CURRENTAND GNRAT LESS
TOURQE,IN DELTA CONDETION TAKE MORE CURRENT AND DEVLOPED
MORE TOURQ.

Answer / pallav

star connected motor voltage is high then delta connected motor. then voltage is increases then current decreases. means delta connected motor speed is high as compare to star connected motor

I am working in 600MW power plant currently in erection phase. I came along this term and want to know its meaning in simple language, consider me naive!?? All motors shall be of energy efficient type EFF-2 as per IS:12615/ equivalent IEC / International Standard.

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