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Question
What is the calculating formula for HT and LT amps in a 
transformer.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
P=root3 v i cospie

I = P/root 3 . v. cos pi
 
Is This Answer Correct ?    60 Yes 13 No
Lokesh Ranjith
 
Answer
# 2
the rating KVA=Root 3*Vl*Il Apply primary and secondary
voltages to get the max. current
 
Is This Answer Correct ?    43 Yes 7 No
Baskaran.r
 
 
 
Answer
# 3
CURRENT IN LT SIDE
=KVA *1000/1.732*LT VOLTAGE*COSQ


CURRENT IN HT SIDE
= KVA *1000/1.732*HT VOLTAGE*COSQ
 
Is This Answer Correct ?    35 Yes 13 No
Rajesh Tewari
 
Answer
# 4
FOR EXP....

in 50mva trx mean
P= ROOT3 *V*I*COS

50*1000*1000=1.732*110*1000*I

I= 262.4 IN PRIMARY SIDE

50*1000*1000=1.732*33*1000*I

I= 874.8 AMPS IN SEC SIDE
 
Is This Answer Correct ?    24 Yes 9 No
Thyagarajan
 
Answer
# 5
V*I(HT SIDE)=V*I(LT SIDE) 
Is This Answer Correct ?    28 Yes 15 No
Mukul Tyagi
 
Answer
# 6
If the current of one side either primary or secondary is
known than the current of other side will be in same
proportion as the volotage ratio of primary and secondary
side.
For example -for a 1000 KVA 11kv/0.4 kv transformer if there
is 1 amp. current in HT side than current in LT side will be
1x11x1000/400 i.e almost 26 amps.
 
Is This Answer Correct ?    18 Yes 9 No
S.l.bhatt
 
Answer
# 7
amps in LT side I=P/root 3 * v* cos pie
amps in HT side I=P/root 3 * v* cos pie
 
Is This Answer Correct ?    18 Yes 10 No
Balasubramanian
 
Answer
# 8
I=HTV/LTV 
Is This Answer Correct ?    15 Yes 10 No
Manoj Kumar
 
Answer
# 9
Let suppose u have taken 1500 kva transformer of 11kv to 415 v u wanna be the current calculation for the both HT side and LT side. But u also think that u have connect load of the transformer 1000 kw. In this case both HT & LT SIDE power drawn is same. But this is three phase so we take formula
P equal to SQ ROOT 3 *V* I COS phai
Remember cos phai is necessary becuse of we know KVA :::: KW/ COS phai
U have connect 1000kw and its drawn full lo
ad then it wil be calculate in HT SIDE
1000*1000:::1.732*11000*0.8* I(u take power factor as0.8)
I::::65.6A
WHILE calculating in LT SIDE IT wil be
1000*1000::: 1.732*440*0.8* I
I:::1739.05A
because power drawn HT & LT SIDE depend on load connected to the transformer
 
Is This Answer Correct ?    4 Yes 1 No
Raju Kumar Singh
 
Answer
# 10
KVA= VI/1000 
Is This Answer Correct ?    10 Yes 9 No
Awadhesh Kumar
 

 
 
 
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