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Analysis of Leak and Water Absorption Test Results for Water-Cooled Generator Stator Windings
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 Title & Authors
Analysis of Leak and Water Absorption Test Results for Water-Cooled Generator Stator Windings
Kim, Hee-Soo; Bae, Yong-Chae; Lee, Wook-Ryun; Lee, Doo-Young; Kim, Hee-Dong;
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 Abstract
Cases of insulation breakdown damage of water-cooled generator stator windings occur frequently due to coolant leakage and water absorption worldwide. Such serious accidents may cause not only enormous economic loss but also very serious grid accidents in terms of stable supply of electric power. More than 50 % of domestic generators have been operated for more than 15 years, and leak and water absorption problem of windings are often found during the planned preventive maintenance period. Since 2005, leak and water absorption tests have been performed for total watercooled stator windings after fully drying the inside of the windings. The results are then comprehensively analyzed. The result of the test performed by GE, a foreign manufacturer, for 141 generators showed failures in 80 of them (failure rate: 57 %), whereas in the tests carried out in Korean domestic power plants, only 14 out of 50 generators showed failures (failure rate: 28 %).
 Keywords
Insulation breakdown;Generator stator windings;Leak test;Water absorption test;
 Language
English
 Cited by
1.
Study on Reliability of Water Absorption Diagnosis through Precise Water Absorption Test,;;;

Journal of Electrical Engineering and Technology, 2012. vol.7. 5, pp.772-777 crossref(new window)
2.
흡습된 수냉각 발전기 고정자 권선의 전기적 특성,김병래;김희동;

한국전기전자재료학회논문지, 2012. vol.25. 10, pp.817-823 crossref(new window)
1.
Study on Reliability of Water Absorption Diagnosis through Precise Water Absorption Test, Journal of Electrical Engineering and Technology, 2012, 7, 5, 772  crossref(new windwow)
2.
Electrical Properties of Wet Bars in Water-cooled Generator Stator Windings, Journal of the Korean Institute of Electrical and Electronic Material Engineers, 2012, 25, 10, 817  crossref(new windwow)
 References
1.
GE Power Generation, Technical Information Letter- 1098, 1993

2.
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Bae, Y. C., Kim, H. S., Lee, D. Y., and Lee, W. R., 2008, "An Experimental Study on Water Absorption Characteristics of Generator Stator Bar Insulation by Cooling Water Temperature in 500MW capacity Power Plant", Trans. Korean Institute of Electrical Engineers, Vol. 57, No. 8, Aug, pp. 1392-1397

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Kim, H. S., Bae, Y. C., Lee, W. R., and Lee, D. Y., 2010, "An Experimental Study on the Dryness Judgment Criterion for Water-cooled Generator Stator Windings", J. of Korean Society of Mechanical Engineers(B), Vol. 34, No. 2, pp. 137-143 crossref(new window)

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Kim, H. S., Bae, Y. C., Lee, W. R., and Lee, D. Y., 2010, "Experimental Study on Prediction and Diagnosis of Leakage and Water Absorption in Water-Cooled Generator Stator Windings by Drying Process Analysis", J. of Korean Society of Mechanical Engineers (B), Vol. 34, No. 9, pp. 867-873 crossref(new window)

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Kim, H. S., Bae, Y. C. and Kee, C. D., 2008, "Wet Bar Detection by Using Water Absorption Detector", J. of Mechanical Science and Technology, Vol. 22, pp. 1163-1173 crossref(new window)