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Question
Why we should use delta connection in primary and star 
connection in an distribution transformer, which converts 
400v a.c. voltage to 33kv.
 Question Submitted By :: Mahesh
I also faced this Question!!     Rank Answer Posted By  
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 1
We use in star connection in seconday connection becouse
need neutal point in load sied( some load supply need 3
phase and some need single phase)but it is remember that
only star connection use in distrubution side transformer.
 
Is This Answer Correct ?    74 Yes 26 No
Engr. Abdul Barek, Electrical
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 2
we dont need nuetral at primary side but it is needed at
sec. side because some loads of 3 ph and single phase loads
required nuetral.
 
Is This Answer Correct ?    41 Yes 18 No
R M Koloi
 
 
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 3
Star connection having multiple option of voltages, and
availability of neutral point makes useful for earth fault
relay operation.

Delta connection having requirement of 3 conductors and
itself is long distance, with less current and higher
voltage. So economical way is delta at high voltage side
and star at low/ or consumer end.
 
Is This Answer Correct ?    46 Yes 12 No
Rvg
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 4
the answer of Mr. RVG is correct. But I would like to
correct the question itself. Distribution transformer
converts voltage from 33KV to 400V, not 400V to 33KV.
 
Is This Answer Correct ?    52 Yes 8 No
Suresh Kumar
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 5
suresh its stepup X-former we need to increas de voltate
level please ref curent equation of star and delta
conection u can get apt answer
 
Is This Answer Correct ?    2 Yes 13 No
Raja
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 6
Nuetral in used in single phase system and 3 phase 4 wire
systeme due to we star connection in secondory. in primary
used 3 phase system.but suresh kumar why not convert
voltage from 400v to 33kv.p/s explain the reason.
 
Is This Answer Correct ?    1 Yes 5 No
Sunil Kode
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 7
For distribution transformers, loads are connected to
secondry side. hence, requirement of neutral can be
obtained by connecting secondry of the transformer in star.
Secondly, to reduce or minimise the third harmonics in the
transformers, primary side connection generally done in
delta.
 
Is This Answer Correct ?    15 Yes 3 No
Pankaj Malhotra
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 8
in secondary side there is a chance for single phase load,
three phase load, if its single phase load added more there
is a chance for unequal voltage in each phases. here we
need one neutral point that is refered as a reference
potential for load equalise the phase voltages
 
Is This Answer Correct ?    7 Yes 3 No
Siva
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 9
WE USE DELTA CONNECTION AT PRIMARY AND STAR CONNECTION AT
SECONDARY IN CASE IF STEP UP OF VOLTAGE REQUIREMENT BECAUSE
IN DELTA/STAR TRANSFORMER THE OUT PUT VOLTAGE WILL BE 1.413
TIMES HIGHER THAN THE PHASE VOLTAGE EVEN WHEN BOTH HAVING
SAME NUMBER OF TURN. SO THE SECONDARY WILL REQUIRE LESS
INSULATION.
 
Is This Answer Correct ?    8 Yes 7 No
Swayanjit
 
  Re: Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.
Answer
# 10
we should use delta connection in primary and star to
secondary because in delta line voltage = pphase voltage
and instar line voltage = 1.732phase voltage hence we get
173.2% more voltage hence we use delta star transformer.
 
Is This Answer Correct ?    11 Yes 2 No
Nitin Palaskar
 

 
 
 
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