Dyn11 vs Dyn5

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Abu Khansa Power-User Join Date: Oct 2006 Location: Indonesia Posts: 102	Dyn11 vs Dyn5 06/20/2011 11:26 PM
	Anyone, What the advantage or disadvantage of Dyn11 compare to Dyn5? thanks.
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: Dyn11 vs Dyn5 06/21/2011 1:04 AM
	There is a good Wikipedia article on transformer vector groups. Each difference of one in vector number represents a 30° phase shift. A difference of 4 (or 8) is a 120° phase shift, and thus (I think), differences of 4 (or 8) can be made compatible by "rolling" the phases. Other differences are incompatible if paralleled. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#2 Re: Dyn11 vs Dyn5 06/21/2011 10:01 AM
	Have you referred to J & P transformer book?
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vijaykumarkosuri Participant Join Date: Jun 2011 Posts: 2	#3 Re: Dyn11 vs Dyn5 06/22/2011 12:34 AM
	With regards to theory, there are no special advantages of Dyn11 over Dyn5. Practically when seen, the relative places of the phases remain same in Dyn11 as when compared to Dyn5. This is to say that if we are on the the HV side of the Transformer, and if we denote the phases as R Y B from left to right, the same phases on the LV side will be R Y B, but from Right to left. This will make the Transmission lines have same colour (for identification) whether it is input to or output from the Transformer.
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rbnwatson Member Join Date: Jul 2009 Posts: 5 Good Answers: 1	#4 Re: Dyn11 vs Dyn5 06/22/2011 4:51 AM
	The only difference is the phase change as the 3 phase voltages go thro the transformer. A Dyn11 transformer, if abc terminals are connected to rst phases, will shift the output from "12 o clock" to "11 o clock" ie 30 degrees back. A Dyn5 if connected the same way will advance the output to "5 o clock" ie 150 degrees forward. The difference in output between the Dyn11 and Dny5 and is therefore 180 degrees. In isolated applications there is no advantage or disadvantage. If however you wish to interconnect the secondary sides of different Dny transformers, you must have compatible transformers, and I dont think that can be achieved if you have a Dyn11 among a group of Dyn5's and vuce versa. If you cross phase a Dny1 by connecting acb to rst, you can create a secondary 3 phase system which is 60 degrees displaced from the Dyn1, equivalent to a Dyn11.
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