why transformer ratings in kva?
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Answer Posted / fred gleicher
KW, or kilowatt, assumes both current and voltage are in
phase. In a transformer, it is possible for current and
voltage to be out of phase ( since a transformer is
inherently normally an inductive device ). Therefore, the
rating is given in VA or volt amps, instead of watts,
showing that current and voltage may be out of phase. The K
comes from the MKS system and is an abbreviation for
thousand. It just makes it easier to write the power rating
of the device, most transformers ordinary folks see are
rated in the VA range, but electrical linemen see devices
rated in the KVA range every day.
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