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Question
what is the diffrence between star and delta connection ?
when we use each one ?what is the best ?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
STAR Connection:
i)Supply voltage is VL/root3 but supply current
IL(line)=Iph(phase).
DELTA connection:
i)supply voltage is VL=Vph but supply current
is differ.
Both supply used in speed control of induction motor.
Transmission point of viwe delta is better.
Application point of viwe star is better.
 
Is This Answer Correct ?    104 Yes 14 No
Infodoss
 
Answer
# 2
In continuation to Answer 1, both are having their own
importance depending up on usage. How ever where neutral is
required star system will be adopted.
 
Is This Answer Correct ?    54 Yes 13 No
Mvr Murthy
 
 
 
Answer
# 3
Star Connection:
1. It is a setup where in one end of each phase is
connected together so as to form a neutral.
2. It is used for variable loadings
3. The line current = Phase current
4. The Line voltage = sqrt(3)* Phase volatge.
DELTA CONNECTION:
1. It is a setup where in one end of one phase is joined to
starting end of another end so a ring is completed.
2. It is used for balanced loads.
3. There is no neutral in here
4. Line current = sqrt(3)*phase current
5. Line voltage = phase voltage.
line volt- voltage taken from two live wire= voltage taken
from one live neural connection
 
Is This Answer Correct ?    20 Yes 2 No
Ramesh
 
Answer
# 4
star is only used intial to because the supply voltage is
VL/root3 and due to high starting torque of induction
motor,'star delta circut used above 20kw.
 
Is This Answer Correct ?    26 Yes 11 No
Zahid Khan
 
Answer
# 5
IN STAR CONNECTION THE LINE CURRENT EQUAL TO THE PHASE
CURRENT AND LINE VOLTAGE GREATER THAN PHASE VOLTAGE ,
VPH=VL/ROOT3 AND IN DELTA CONNECTION THE LINE CURRENT
GREATER THAN PHASE CURRENT , IL=IPH X ROOT3 AND LINE
VOLTAGE IS EQUAL TO PHASE VOLTAGE AND FINALLY BOTH
CONNECTIONS ARE VERY USEFUL IN THE 3 PHASE SYSTEM.
 
Is This Answer Correct ?    20 Yes 5 No
Kb Shrinivas
 
Answer
# 6
For transmission, delta connection is suitable while for
distribution system, star connection is sutable because
nuetral is available in star connection.
 
Is This Answer Correct ?    14 Yes 1 No
S K Singh
 
Answer
# 7
In star connection neutarl is already provided, so when we need neutral, we shold use star connection.

delta connection is used to reduce the effect of circulating current in the circuit.
 
Is This Answer Correct ?    14 Yes 3 No
Rahul
 
Answer
# 8
4 transmition and 4 the motor at rated speed delta is
better b/c the current in delta is small/line at its
voltage than in Y so it saves the winding and the
insulation from over heating.
 
Is This Answer Correct ?    17 Yes 7 No
Nardos Negash
 
Answer
# 9
star connection is used when we need nuetral ,
d connection can be used to decrease the circulating
current in the system
 
Is This Answer Correct ?    11 Yes 2 No
Rajkumar Voorugonda
 
Answer
# 10
delta is prefered becoz it torque and power is greater as
compared to star connection
star is only used initial to becoz of the Supply voltage is
VL/root3 thus preventing drop in the line
 
Is This Answer Correct ?    31 Yes 24 No
Glen
 

 
 
 
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