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Question
why transformer rating in kva and motor rating in kw
Question Submitted By :: Spondan_somnath
I also faced this Question!!     Rank Answer Posted By

Re: why transformer rating in kva and motor rating in kw
# 1
there are two losses in transformer.copperloss and iron
loss.these two factors are not affected by power
factor.hence transformer is rated in kva

 Is This Answer Correct ? 15 Yes 14 No
Athul Thilak

Re: why transformer rating in kva and motor rating in kw
# 2
in transformers the output depends upon voltage and ampere
and in motors it depends upon power.

 Is This Answer Correct ? 8 Yes 14 No
Kirtan

Re: why transformer rating in kva and motor rating in kw
# 3
BECAUSE A TRANSFORMER HAS ELECTRIC ENERGY AT INPUT AND
OUTPUT SIDE WHEREAS A MOTOR HAS MECHANICAL ENERGY AT THE
OUTPUT. MECHANICAL ENERGY HAS THE UNIT OF WATTS.

 Is This Answer Correct ? 2 Yes 13 No
Basheer Ahmed

Re: why transformer rating in kva and motor rating in kw
# 4
transformer is nothing but power producing equipment.So the
powre p=V*I.v=Voltage,I=Amps.the minimum rating of the
distribution transformer is 1000V.i.e 1 Kilo
volt,v=volts,&I=amps.So thats while we can saying in KVA.

Moter rating in H.P & 1 H.P=0.732kiloWatts.
So moters having load is almost Drives.

 Is This Answer Correct ? 1 Yes 14 No
Muniraja

Re: why transformer rating in kva and motor rating in kw
# 5
In transformer there are tho typw of losses core losses and
copper losses. core losses depends upon voltage and copper
losses depend upon current. there is no windage losses in
transformer whereas in motor it occurs.
so, in conclusion there is no any factor in transformer
which relates with power factor so the rating of
transformer is in KVA instead of KW.

 Is This Answer Correct ? 9 Yes 2 No
Rahul Khurana

Re: why transformer rating in kva and motor rating in kw
# 6
it is because a transformer uses ac voltage and therefore
the voltage and current are not always in phase whereas a
motor uses dc voltage to produce the turning effect(voltage
and current are always in-phase)

 Is This Answer Correct ? 1 Yes 6 No
Simza

Re: why transformer rating in kva and motor rating in kw
# 7
when we calculation the power of motor : p= v*i *cos&
but when ------------------------ trans : s= v*i = va
at trans total power maen that : s=p+q
wher: s = total power or apparent power
p= active power( this is the force depent in motion
motor )
q= reactive power( depend in sometime losses)
wehre cos&= real power/apparent
finaly all of above are unit of power

 Is This Answer Correct ? 0 Yes 2 No

Re: why transformer rating in kva and motor rating in kw
# 8
Transformer is a show the capacity in Kva
And
Motor KW shows a How much Power Consumtion on it

 Is This Answer Correct ? 2 Yes 2 No
Aashwin P

Re: why transformer rating in kva and motor rating in kw
# 9
The copper loss of a transformer depends on current and iron
loss depends on voltage.Hence total losses depends on volt
ampere(VA) only and it is independent of load power
factor.That is why the rating of Transformer is given in KVA.

 Is This Answer Correct ? 3 Yes 0 No
Ganesan

Re: why transformer rating in kva and motor rating in kw
# 10
RATING is given in kw when we have any knowledge about the power factor of the load which is to be connected on the output side.
in case of the transformers we have no information about the power factor of the load so it is evident to define its ratings in terms of (VA)

 Is This Answer Correct ? 1 Yes 0 No
Gms

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