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why transformer ratings in kva?
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Answer Posted / pradyumna chandra panda
Why the Transformers are rated in KVA?
Ans . Motor is a consuming device it consume the power
(wt) so it is rated in KW. But the
Transformer is a static device which transfers
the power (Apparent power) from the
Generating point to the user. Apparent power is
the product of voltage and current
I.e. Increase voltage with decrease current and
decrease voltage with increase current. Power factor of the
load does not share with main losses (Iron and copper) it
affects the Active Power which share of apparent power.
Active power is the real power which the transformer
gives. Transformer should not be rated on the base of
Active power (KW) which is variable because the power factor
of the load is not knows before which to be connected across
the transformer.
Active power is equal to apparent power at resistivity load
where power factor is unit at cos Q is equal to zero degree.
Active power is decrease power where cos Q (not fi) is
increase
Therefore in simple we can say due to unknown power factor
of load, transformer and alternator are rated in KVA.
Hint – we know cos FI is the value of cos Q i.e. Apparent
power/ active power.
Transformer input is Apparent power in KVA----- In
Transformer Apparent Power is reduced by Iron loss (k) &
Copper loss --- On Transformer output Active power in KW
PRADYUMNA CHANDRA PANDA
BRG STEEL
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