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http://dx.doi.org/10.3795/KSME-B.2010.34.2.137

An Experimental Study on the Dryness Judgement Criterion for Water-cooled Generator Stator Windings  

Kim, Hee-Soo (Korea Electric Power Research Institute)
Bae, Yong-Chae (Korea Electric Power Research Institute)
Lee, Wook-Ryun (Korea Electric Power Research Institute)
Lee, Doo-Young (Korea Electric Power Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.34, no.2, 2010 , pp. 137-143 More about this Journal
Abstract
Complete dryness inside the stator is a necessary and sufficient condition for the leak test. Microcracks caused by high cycle fatigue due to operation are generated in stator windings, and they are interrupted by water molecules during the leak test. For this reason, during leak test, the wrong value is indicated when there are no leaks in stator windings. Generator manufacturers presents unique dryness judgment criteria for the leak test, but there is no actual criterion that accurately indicates the dryness point for the leak test. The reason is because stator winding has a complex structure and the absence of effective dryness equipment in power plants. This paper proposes a dryness judgment criterion to evaluate if inside the stator winding is dried completely and presents experimental results.
Keywords
Leak Test; Dewpoint; Polarization Index; Vacuum;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 1
연도 인용수 순위
1 Kim, H. S. and Bae, Y. C., 2006, "Application of the New Leak Test Equipment for Water-cooled Generator Stator Windings," Proceedings of the KSME 2006 Spring Annual Meeting, pp. 16761-1682.
2 Bae, Y. C. and Kim, H. S.,, 2008, "A Study on the Systematic Mechanical Integrity Evaluation Methods of Water-cooled Generator Stator Windings," Proceedings of the KSME 2008 Autumn Annual Meeting, pp. 3059-3066.   과학기술학회마을
3 Lamberg, A., etc., "GE Generator Fleet Experience and Available Refurbishment Options," GE Energy GER-4223.