Answer / giridha

because the core losses and cu losses depends on only
voltage and current and is independent of power factor so
t/f rating is in KVA

Answer / manthesh.patil

transformer is rated in kva bcoz cu losses are dependent on
current and iron losses are dependent on voltage ,& they are
independent on powerfactor so transformer is rated in kva
not in kw

Answer / lakshmanan m

According to my opinion, manufacturer cant design the
particular transformer for specific load (capacitive or
inductive load) Thats why they dont give the power in KW.
Because KW= vxIx power factor. but power factor is
depending upon the load. So commonly they are give the KVA
power only. It means KVA= Vx I only. According to the load
we can calculate the KW rating.

Answer / manoj-essar

dear manoj, there is no concern of static or rotating
device, then why r u saying in this way?

Trafo is not having unity pf but it depends upon load type
of trafo...(inductive or capacitive or resistive load)

Answer / sachin /vaibhav

as core loss depends upon voltage & copper loss on
current independant of PF. HENCE RATING IS IN KVA

Answer / vasumalai madhavan

In transfomer, the core loss depends upon voltage and
copperloss depends on current , it was (transoformer) not
dependable on power factor . thats why the rating of the
transformer always in kva not in kw....

Answer / shinyvikram ganji

rating of the transformer is done based on losses(core and
copper losses).

Answer / ravi

transformer losses are in terms of current and voltage only
i.e (I Square R) copper loss and VI is the Core loss. i.e y
units are in KVA

Answer / beau

because transformer capacity takes care of both real power
consumed by resistive loads and reactive power in inductive
and capacitive loads such as motors and the transformer's
windings inductive reactance(Apparent power KVA).

Answer / thiyagarajan

kv is an apparent power kw is an active power the ratio
between active and apparent power is power factor ,we dont
know the power factor before connecting to load that why we
are used to refer kv in transmission

we are having 15kw and 3kw motor both can run in same time , instead of using copper we are using ug aluminium cable , 35 sq.mm is suitable for its current carrying capacity..?

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