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Guest	the problem of connecting two 750kva tranformers in parallel . 06/27/2009 8:32 AM
	we intend connecting two 750kva transformers in parallel on the lv side, having two different vector group, one is dyn 11 the other is dyn5.
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sb Guru Join Date: Mar 2007 Location: India Posts: 2593 Good Answers: 102	#1 Re: the problem of connecting two 750kva tranformers in parallel . 06/27/2009 9:42 AM
	Please consult an expert (it is unlilely that you have done) You are likely to be left with no transformers. __________________ Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches

wareagle Guru Join Date: Jun 2008 Location: Nashville Posts: 644 Good Answers: 18	#2 In reply to #1 Re: the problem of connecting two 750kva tranformers in parallel . 06/27/2009 11:19 AM
	You can search the forum for more information. here is one answer: http://cr4.globalspec.com/thread/4934/Types-of-Vector-Groups-for-Transformers

CJMcGill Guru Join Date: Jul 2008 Location: SoCal USA Posts: 524 Good Answers: 21	#3 Re: the problem of connecting two 750kva tranformers in parallel . 06/27/2009 2:59 PM
	Another useful discussion: Differences between neutral and eart (ground) connections __________________ I do not 'know it all', but i will admit that I would like to. CJM

msamad Power-User Join Date: Feb 2009 Location: Houston, USA Posts: 213 Good Answers: 44	#4 In reply to #3 Re: the problem of connecting two 750kva tranformers in parallel . 06/28/2009 10:35 AM
	In Dyn11, the phase angle of the LV winding lags the HV by 11x30 = 330 degrees with the corresponding phase (or leads 30 degrees); while in Dyn5, the phase angle of the LV winding lags the HV by 5x30 = 150 degrees with the corresponding phase or lags 150-120 = 30 degrees with another phase. In no case, you can connect it with having 0 phase difference in secondary side. So, it is not possible at all. -MS

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