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Question
Why should we use Star-Delta connection in step down power 
transformers?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
in Y the vL=1.73*vp
in delta vl=vp and current IL=1.73*ip
also for distribution required 230 n 433v so neutral is
required so we used y - delta conec.
 
Is This Answer Correct ?    23 Yes 3 No
Harishchandra
 
Answer
# 2
Actually we use Delta-Star connection for step down to get
neutral in the secondary. The question is wrong , should
read why we use delta-Start connection , not opposite.
 
Is This Answer Correct ?    11 Yes 5 No
Hussain
 
 
 
Answer
# 3
actually delta star trnasformer used in step down
trnasformer to avoid earthfault give effect of over
current on hv side of the trnaformer
 
Is This Answer Correct ?    1 Yes 0 No
Pkv
 
Answer
# 4
1:--- actually we used delta -star connection in power
distribution transformer to provide the returning path of
current,because connected load does not balanced so
returning current goes to transformer star point through
neutral wire which always earthed.
2;---In distribution load is being different type like
single phase three phase etc so we have required neutral for
single
phase load which is only possible in star connection.
 
Is This Answer Correct ?    1 Yes 0 No
Guest
 
Answer
# 5
question is wrong,
normally we use delta-star connection for step down
transformer to prevent earth faults.
 
Is This Answer Correct ?    0 Yes 2 No
Rafeek
 
Answer
# 6
Because starting voltage of the star connection is less
compare 2 other connections..........
 
Is This Answer Correct ?    6 Yes 16 No
Paramesh
 

 
 
 
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