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Question
why do we use UPF watt meter in short circuit test of the 
transformer and LPF watt meter in open circuit test of the 
transformer
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
In full load test, rated current
is made to flow and hence the
fraction of magnetising current
is less compared to the watt
component.. Hence power factor
would be nearly unity.. So UPF
wattmeter is used..
But whereas in no load test,
since the machine is not loaded,
watt component of current would
be negligible as compared to
magnetising component.. Hence
the power factor would be very
low.. So LPF wattmeter is
used..!!
 
Is This Answer Correct ?    61 Yes 9 No
Pradeepkumar
 

 
 
 
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