Why Are Transformers Rated in KVA Instead of KW? Relationship to HP, KVA, and KW Explained

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#1 21666750 22 Feb 2013 19:21

victor Nyami victor Nyami

Anonymous

Post #1
21666750 22 Feb 2013 19:21

why transformers are rated in KVA instead of KW?
Is there any relationship between horse power unit,KVA and KW?

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#2 21666751 22 Feb 2013 22:32

Rodney Green Rodney Green

Anonymous

Post #2
21666751 22 Feb 2013 22:32

The reason for KVA rating or VA rating on the surface seems to be the same thing. However the load voltage and current are not always in phase where the load is not purely resistive. Motor generator sets are also rated this way and for the same reason. I hope this helps.
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#3 21666752 22 Feb 2013 22:37

Rodney Green Rodney Green

Anonymous

Post #3
21666752 22 Feb 2013 22:37

Thus the transformer can withstand X amps and Y voltage and the product of the two cannot be exceeded without risking the transformer. In a severe case where there is a heavy reactive load there may be not much actual power delivered in KW but the transformer may still be fully loaded. This is where power factor correction comes into play when it is required to load the transformer resistively and deliver its full load.
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#4 21666753 23 Feb 2013 10:44

Steve Spence Steve Spence

Anonymous

Post #4
21666753 23 Feb 2013 10:44

kva is volt times amps, and ignores the power factor of the load (AC Only). 120v * 5 amps = 600 va. A load with power factor of .5 would consume 900 watts.
#5 21666754 27 Feb 2013 16:25

Frank Bushnell Frank Bushnell

Anonymous

Post #5
21666754 27 Feb 2013 16:25

http://en.wikipedia.org/wiki/Transformer

http://en.wikipedia.org/wiki/AC_power
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Why Are Transformers Rated in KVA Instead of KW? Relationship to HP, KVA, and KW Explained

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