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Question
How the CT and PT ratings are calculated
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
First we should know whether CT /PT is used for measurement
purpose or for protection ,primary currentand voltage
After getting the above details ,we can decide the
specification of CT/PT like accuracy
class,ratio,burden,type etc
 
Is This Answer Correct ?    3 Yes 0 No
M U Shetty
 
Answer
# 2
depending up on the number of windings in primary and in
secondary winding,we can calculate the CT and PT rating of
the transformer.
N2/N1=V2/V1
 
Is This Answer Correct ?    7 Yes 6 No
Ravi
 
 
 
Answer
# 3
OK BUT CAN GIVE SOME MORE DETAILS FOR ME 
Is This Answer Correct ?    1 Yes 0 No
Hanu1985
 
Answer
# 4
OK BUT WE WANT MORE DETAILS WITH FORMULA ALSO 
Is This Answer Correct ?    0 Yes 1 No
Nagarajan
 
Answer
# 5
Its Basically the requirement of the client.
ie. The client operationg load along with consideration for
future loads. This gives you the power, now for the Volatge
& current we have to do a bit survey regarding which
voltage level is available in the vicinity & the availibity
of the same from the electricity board. This gives us the
Volatge rating & current is now calculated.
Now we have to see what protection are required & depending
on that we select the no of cores in both The CTS & PTS.
 
Is This Answer Correct ?    5 Yes 9 No
Chandrasen Mourya
 

 
 
 
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