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Question
what is the difference betweem star connected motor & delta 
connected motor?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
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....
 
Is This Answer Correct ?    135 Yes 24 No
A. V. Ramana Reddy
 
Answer
# 2
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.
 
Is This Answer Correct ?    62 Yes 5 No
S.r.ramalingam
 
 
 
Answer
# 3
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.
 
Is This Answer Correct ?    156 Yes 114 No
Killer
 
Answer
# 4
star connected motor gives a more torque compare to delta
connected.
 
Is This Answer Correct ?    42 Yes 28 No
Krishna
 
Answer
# 5
In star connected motors power consumption will be less
compared to delta connected motors.
 
Is This Answer Correct ?    26 Yes 13 No
Joseph James
 
Answer
# 6
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.
 
Is This Answer Correct ?    6 Yes 1 No
K.mohan Kumar
 
Answer
# 7
STAR CONNECED MOTER TAKE LESS CURRENTAND GNRAT LESS
TOURQE,IN DELTA CONDETION TAKE MORE CURRENT AND DEVLOPED
MORE TOURQ.
 
Is This Answer Correct ?    6 Yes 8 No
Yasirfraz
 
Answer
# 8
actually we uses star and delta connections in a motor for
starting purposes,when the motor starts it will take high
current which effect to our power factor so to reduce the
inrush current we use the star/delta connections. in start
we get high tarque and less current which is our
requirments,in delta we get high current and less torque.
 
Is This Answer Correct ?    26 Yes 34 No
Faiz Mohammad Bugti
 
Answer
# 9
STAR CONNECED MOTER TAKE LESS CURRENTAND GNRAT LESS
TOURQE,IN DELTA CONDETION TAKE MORE CURRENT AND DEVLOPED
MORE TOURQ.
 
Is This Answer Correct ?    32 Yes 48 No
Rajendra Panwar
 
Answer
# 10
In star connected motor torque developed is small & In
delta connected motors torque developed is more as compared
to star.
So it totaly depends on ur application which type of
connection u requires.
 
Is This Answer Correct ?    25 Yes 64 No
Sagar Hingmire
 

 
 
 
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