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Question
WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
 Question Submitted By :: Hasmat@ali
I also faced this Question!!     Rank Answer Posted By  
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 1
generator is produced in current but supply the current from
motor is running in this differance between kva & kw
 
Is This Answer Correct ?    33 Yes 205 No
Sundar
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 2
Generator is producer of Voltage and Current, we can
connect load as such draining full load current or half
load, even noload,but voltage remain moreover same.So it
willl rated in terms of product of V*I, secondly it gives a
electrical output for any Load(may Capacitor,Inductor &
resistor),so it is consider as Procuct of Voltage & Current
excluding powerfactor.
Whereas motor is machines coverts electrical Energy to
Mechanical energy, so it is rated in KW
 
Is This Answer Correct ?    154 Yes 48 No
Balaji
 
 
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 3
Transformer and genrator PF depends on the nature of
connected load ( Motor ), But motor has its own fixed Power
factor

Therefore Transformer and genrator capacity shown in KVA (
Without PF ) and motor Capacity shows in Kw ( with power
factor )
 
Is This Answer Correct ?    172 Yes 19 No
Ravi - Cement Plant India
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 4
Generator is a source of power. It includes active as well
as reactive power. It deliver only active power while
working on unity power factor. It deliver reactive power
only while connected to a purely reactive load. It can
deliver both of these powers while connected to a composite
load. This signifies that the current limit is the main
factor here. You can draw a purely rective current of rated
value or purly active current of rate value. combination of
output depends upon the load but the maximum limit is
prescibed.
When you are drawing both of the currencts active and
reactive, in such condition how much the alternator can
deliver? it can be descibed by KVA only not by KW. That is
why alternators are rated in KVA.
Motors are rated in KW only because for motors the load is
mechanical and thus only active power which is converted to
mech. is significant.The power factor of the motor is
independent of the load and at whatever powerfactor it
works it is due to its desing.
 
Is This Answer Correct ?    58 Yes 18 No
P Tiwari
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 5
generators and trasformers are rated i kva.kw=kvaxcos
(phi).the manufacture didn't no custmor load(in kw).one
more answer iron losses depends on supply voltage and cu
losses on current.so taht kvxi=kva
 
Is This Answer Correct ?    24 Yes 22 No
Mohan
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 6
Generator and transformer are rated in KVA becoz at that
time we dont know the consumer power factor as we know that
the (KW= KVA X Cos Phi) as we know the power factor we have
ratings in KW and on the other hand motor has defined power
factor and the rating has been mentioned in KW for example
if we have transformer of rating 50KVA this rating of
transformer is its apparent power that is KVA if we
multiply the same withh the power factor 0.85 we will get
the real power that is KW

KW= KVA X Cos phi
KW = 50 X 0.85
KW= 42.5KW
 
Is This Answer Correct ?    53 Yes 8 No
Zulfiquar Wani
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 7
In generators and transformers the maximum possible load is
decided by temperature rise of the machine.

And all of us know the temperature rise is directly
prepotional to Current in machine and which is prepotional
to KVA.


But in the case of motor the possible maximum loading is
depends on the output torque.So its ratyeing is always in
KW.
 
Is This Answer Correct ?    4 Yes 48 No
Srujan
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 8
We all know that the factor "Power factor" comes only when
the voltage & current waves are travelling at a time
difference. This will happen due to the
inductive /capacitive nature of the load(Depends how the
load receives the power from the sourcei.e whether voltage
first (inductive)or current first(capacitive).

But at the time of producing the power, voltage and current
waveforms are starting from the source at the same time
only. Hence the question of power factor does not arise...

Hence DG is rated in kVA only...

Pls clarify ...
 
Is This Answer Correct ?    13 Yes 11 No
R.baskar
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 9
All the answers are good... 
Is This Answer Correct ?    5 Yes 32 No
Peter
 
  Re: WHY THE GENERATOR RATING IN KVA & MOTOR RATING IN KW?
Answer
# 10
Generator is producer of Voltage and Current, we can
connect load as such draining full load current or half
load, even noload,but voltage remain moreover same.So it
willl rated in terms of product of V*I, secondly it gives a
electrical output for any Load(may Capacitor,Inductor &
resistor),so it is consider as Procuct of Voltage & Current
excluding powerfactor.
Whereas motor is machines coverts electrical Energy to
Mechanical energy, so it is rated in KW.
 
Is This Answer Correct ?    7 Yes 9 No
Ramesh
 

 
 
 
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