Transformer

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Prajith o c Participant Join Date: Jul 2014 Location: kerala Posts: 4	Transformer 07/23/2014 6:00 AM
	A single -phase transformer is rated at 100 KVA, 5000/250V. The full load copper losses are 1KW. The load KVA for maximum efficiency is?
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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 07/23/2014 6:23 AM
	...exactly what it says in the question unless the manufacturer says otherwise in the operation manual, the technical datasheet, or over the phone. __________________ "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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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15600 Good Answers: 981	#2 Re: Transformer 07/23/2014 9:24 AM
	I want you to read very carefully this line from the CR4 FAQ. Do your own homework. CR4 is not a homework cheat site. While some here might relish the opportunity to sharpen up old rusty skills by working the homework problem, consider the following and consider it well. If you cheat on your homework by using someone else's answers, you are only cheating yourself, because the purpose of any homework or other academic assignments is to help you learn - by practice, repetition, and self-discovery. __________________ "Don't disturb my circles." translation of Archimedes last words
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ShawnHoppe Associate Join Date: Jul 2014 Location: I live in USA, Colorado in the houses of 7 Summits Posts: 28	#3 Re: Transformer 07/25/2014 3:05 AM
	As transformer start working at constant voltage and frequency, its efficiency varies with the load, the efficiency of the transformer becomes maximum at a certain point, and after this point if the transformer again start loading then its efficiency will decreasing.
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dhayanandhan Guru Join Date: May 2008 Location: CHENNAI, TAMIL NADU, INDIA. Posts: 1851 Good Answers: 65	#4 Re: Transformer 08/01/2014 11:32 AM
	Dear Mr.Prajith oc Your question is " For a Transformer and DC Motor, the CONDITION for MAXIMUM EFFICIENCY is CONSTANT LOSS should be EQUAL to COPPER LOSS i.e. I^2 x R LOSS. So, for your Transformer the CONSTANT LOSS (Or CORE LOSS) should be equal to 1 KW. It is not known from your statement - what is the core loss. DHAYANANDHAN.S
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