why transformer ratings in kva?
Answers were Sorted based on User's Feedback
Answer / amr mobarak
From the Theory of Design of any transformer we know that :-
S(primary ) = S(secondary ) , neglecting the Losses
I.V (primary ) = I.V (secondary )
So When We Try to Describe any Transformer We Refer to VA or
KVA or MVA as their Values are the Key of Design not The
Power ( Active or Reactive ).
Is This Answer Correct ? | 10 Yes | 9 No |
Answer / reema
actually rating of a equipment depends upon heat , which
depends upon loss. as in transformer both copper loss &iron
loss dont depend upon power factor . so transformer rating
is in kva.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / geno peter
well, the transformer is independent of the load power
factor thats why KVA
In design we take UPF
Is This Answer Correct ? | 2 Yes | 1 No |
Answer / yasir
Both the losses copper loss(depends on current) and iron
loss(depends on voltage) are independent of power factor,
that is why a Transformers rating is not on kW, but on KVA.
Is This Answer Correct ? | 2 Yes | 1 No |
Answer / waqar joyo
its because power factor of the load is not constant ...
load is not constant continously varies dats y itz in kva
instead of kw
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / anathal
Copper loss of a transformer depends on current and iron
loss on voltage . Hence total losses depends on Volt-
Ampere and not on the power factor. That is why the rating
of transformers are in kVA and not in kW.
http://electricalinterviewquestion.blogspot.com/2010/08/why-
transformers-are-rated-in-kva.html
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / saran
normally rating of a equipment depends upon heat , which
depends upon loss. as in transformer both copper loss &iron
loss dont depend upon power factor . so transformer rating
is in kva.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / r.jayaraj
because,ironloss is depends in voltage and cu_loss is
depends in current.so the transformer ratings in kva
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / kb shrinivasa
Since transformer is a static there will not be any
rotational losses it have only iron loss depend upon
voltage and copper loss depend upon current
for AC supply systems like generator, transformer rating is
done in KVA because of inductance present in AC . we don't
know load is resitive or inductive
it is independent there fore it is measured in kva
Is This Answer Correct ? | 3 Yes | 2 No |
Answer / vijay
In transformer cu loss depends on I, iron loss depends on V,
So, total t/f loss depend on VA, Not on the phase angle bt V
&I. That is independent of load power factor that is y the
t/f is rated in KVA rather than KW
Is This Answer Correct ? | 1 Yes | 0 No |
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