Generator Clearance Issue

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Anonymous Poster #1	Generator Clearance Issue 02/10/2012 4:24 AM
	If Lower quide bearing of Generator (High Voltage Generator) clearence is not proper ,Is there any affect in Electrical System of Generator( especially Winding Stator/Rotar)??????If YES What is recommand Internation Standard Specifications for air gape clearence between rotor pole and stator for Large Generator??? NB:May someone give me chart (ISO AIR GAPE {STATOR WINDING TO ROTOR POLES GAPE} CHART BASED ON RATING OF DIFFERENT MACHINES)??? ISO:::Internation Standard Organization ADDITION:India Standard Specification,Sweden, Swis (ABB),UK,USA...ect maybe acceptable if any.
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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: GENERATOR CLEARENCE ISSUE 02/10/2012 4:29 AM
	What does the original equipment manufacturer's local technical specialist have to say on the subject? __________________ "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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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#2 Re: GENERATOR CLEARENCE ISSUE 02/10/2012 4:38 AM
	Until the rotor begins to contact the stator (whereupon all hell will break loose), there is likely to be little or no effect on the generator's electrical performance. Just think about it. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Rockyscience Power-User Join Date: Sep 2011 Location: Near the New Madrid Fault. USA Posts: 269 Good Answers: 1	#4 In reply to #2 Re: GENERATOR CLEARENCE ISSUE 02/13/2012 1:45 PM
	That is a GA. The closer the better until you get an eccentric rotor then you're done. I have seen rotor bars slung out and you may not know it's open without special equipment and base line of it when healthy. The gap is factory designed of the material makeup, size, speed etc. of the device. __________________ It's not Rocket Science
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ozzb Guru Join Date: Mar 2007 Location: Rosedale, Maryland USA Posts: 5197 Good Answers: 266	#3 Re: Generator Clearance Issue 02/10/2012 8:43 AM
	What do you mean by Lower grade bearing? If you are talking specs as changes in rating like ABEC. There would be little change in rotor to stator clearance to make a difference. Changes in these rating effect eccentricity. There would not be enough change in eccentricity to cause appreciable change in generator output. Unless in lowering the grade of bearing you have exceed it's rpm rating. __________________ Life is not a journey to the grave with the intention of arriving in a pretty, pristine body but rather to come sliding in sideways, all used up and exclaiming, "Wow, what a ride!"
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