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RAMAKANTA Associate Join Date: Dec 2009 Location: INDIA. Posts: 39	Transformer Capacity 03/11/2013 6:27 AM
	How to calculate the transformer capacity (in kVA) rating for a 3 and single phase transformer if name plate missing from tranformer. and how do we know the actual input and output voltage of this transformer. ??? __________________ "Keep work and family separate. "
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	Pathfinder Tags: kVA ratinfg of transformer

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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: Transformer Capacity 03/11/2013 6:36 AM
	Historical records: Look at the commissioning documentation. It will be in there. Look at the maintenance records. It will be in there. Look at insurance records. It will be in there. Look at the purchase records. It will be in there. If its delivery date is known, go back to the supplier and eliminate the ones that do have nameplates fitted from the delivery record. It really shouldn't be in operation if the nameplate is missing and its rating is unknown, as how would anyone know what the settings should be on its overload protection equipment (rhetorical question - NNTR)? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#4 In reply to #1 Re: Transformer Capacity 03/11/2013 2:44 PM
	Practical answers. The homework answer is you perform certain measurments on the primary and secondary windings along with.....(see post #3) __________________ jack of all trades
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electronick Power-User Join Date: Jun 2007 Location: ether Posts: 371 Good Answers: 1	#2 Re: Transformer Capacity 03/11/2013 7:26 AM
	a good way to have a hint, would be just the size of the transformer. a big one will have more power reserve. just a hint... you can also have a look on the protection gear of the machine, and then have a more inside reading... if not the intire one! __________________ “For no man can forbid the spark nor tell whence it may come.” ? Francis Bacon
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#3 Re: Transformer Capacity 03/11/2013 2:42 PM
	Additionally this question has been answered a number of times on CR4, so also try a CR4 forum search. __________________ jack of all trades
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Users who posted comments:

electronick (1); jack of all trades (2); PWSlack (1)

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