Transformer Question

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shidin07 Member Join Date: Oct 2011 Posts: 5	Transformer Question 11/10/2011 8:55 AM
	delta/star transformer it's delta side is connected to another star/delta transformer , star side what happened ?
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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 11/10/2011 8:57 AM
	Dunno. Does it have a neutral terminal? __________________ "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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Anonymous Poster #1	#2 Re: Transformer Question 11/10/2011 12:03 PM
	what happened ? Why did anything happen? I should have thought that nothing should have. After all when I connect a transformer at my home I don't know the distribution transformer is star connected or delta connected _{well I do know but I don't bother.}
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#3 Re: Transformer Question 11/10/2011 12:09 PM
	Sounds like somebody didn't have the right transformer and got creative with what they did have... __________________ All living things seek to control their own destiny....this is the purpose of life
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hithuanand Power-User Join Date: Apr 2010 Location: Asia/India Posts: 365 Good Answers: 1	#4 Re: Transformer Question 11/10/2011 12:38 PM
	Did you say starboard?
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67model Guru Join Date: Dec 2010 Posts: 1686 Good Answers: 116	#5 Re: Transformer Question 11/10/2011 12:38 PM
	Nothing happened, except you connected two transformers together (did you connect A-A,B-B,C-C or was it a-A,b-C,c-B or another?). You have not said you have energized anything - or where!
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#6 Re: Transformer Question 11/11/2011 4:56 AM
	Nothing would happen as long as the delta receives line voltages from the star. In any LV electrical installation, the trafo. secondary is star connected and most of the LV motors are delta connected. We do connect these delta windings of motors to the star winding of the transformer. Did anything happen? This is also akin to that.
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silverfox Power-User Join Date: Nov 2011 Posts: 286 Good Answers: 15	#7 Re: Transformer Question 11/11/2011 7:33 AM
	Draw it out - delta on one side of your drg and star on the other. Label the legs / joints L1,L2 L3. Now connect L1 to L1, L2 to L2 etc. If you had transformers with a ratio 2/1 you would drop the voltage from delta to star and then in the next transformer you would lift it back up again. The current flow due to impedance would be screwed up and generally it would be a very lossy way to transmit power.
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pnaban Guru Join Date: Jun 2010 Location: srilanka Posts: 2725 Good Answers: 5	#8 Re: Transformer Question 11/12/2011 12:57 AM
	You didn't mention vector group and voltage ratio. __________________ pnaban
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67model (1); Anonymous Poster (1); electricalexpert65 (1); hithuanand (1); pnaban (1); PWSlack (1); silverfox (1); SolarEagle (1)

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