Answer Posted / rajeee43@gmail.com
IN ANY MACHINE THE RATING DEPEND UPON HEAT,HEAT LOSS DEPEND
ON HOW MUCH OF POWER LOSS IN THE MACHINE,IN THE TRANSFORMER
THE CORE LOSS DEPENDS ON VOLTAGE AND COPPER LOSS DEPENDS ON
LOAD CURRNT,i.e NO LOSSES DEPEND UPON POWER FACTOR THAT IS
THE TRANSFORMERS ARE RATED IN KVA INSTEAD OF KW.(reffer in
p.s bimbra text book electrical machines)
(OR OTHER WORDS)
KW RATTING IS DEPENDS ON POWER FACTOR ,THAT IS KW VARIES
WITH LOAD POWER FACTORS ,IF TRANSFORMERS RATED KW THE
RATING CHANGE WITH LOAD TO LOAD ,THAT IS THE TRANSFORMERS
ARE RATED IN KVA INSTEAD OF KW.(GENERAL ANSWER
rajeee43@gmail.com)
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