YY Winding Generator

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mustafamohd Active Contributor Join Date: Aug 2013 Posts: 18 Good Answers: 1	YY Winding Generator 09/03/2013 12:53 AM
	Good Day, We have a SIEMEN's Turbogenerator with Stator Winding Interconnection mentioned as YY/54 . I understand that 54 is the number of stator Slots. However YY would indicate a 12 lead generator . I cannot find information regarding such a connection . There are two such generators in parallel to a single double Delta/star Step Up Transformer. Is there a relation to that ? Also is there any other reason such a connection is made. How would it effect the stator induced EMF is the number of windings have doubled as opposed to a conventional 6 lead generator.
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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: YY Winding Generator 09/03/2013 3:35 AM
	Siemens? __________________ "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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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#2 Re: YY Winding Generator 09/04/2013 9:56 AM
	The configuration is used in some large steam turbine driven generators. Each phase has two separate windings that are connected externally to form two star connections The high voltage terminals of each phase are connected in parallel to form a single three phase output. Separate star connections are formed on the neutral end of each winding. These neutral may be at opposite ends of the machine. This arrangement is sometimes referred to as the double-ended, twelve-bushing machine. This is used where the total full-load phase current exceeds the current carrying capability of a single bushing.
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mustafamohd Active Contributor Join Date: Aug 2013 Posts: 18 Good Answers: 1	#3 In reply to #2 Re: YY Winding Generator 09/05/2013 12:45 AM
	Thank You. Does this mean that - at a time - Both sets of windings are provided in parallel to the step - up transformer? This would maintain the same voltage , but now - double the current . Is that right?
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