Electro-thermal ageing in lifetime estimation of hydroelectric generator stator windings

SDEMPED 2011 - 8th IEEE Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives

Volumn , Issue , 2011, Pages 294-299

  Kokko, Voitto I J ^a  

^a Fortum Oil and Gas Oy   (Finland)

Author keywords

ageing; electric machines; hydroelectric generators; insulation; life estimation; windings

Indexed keywords

AGEING; CLASS A; CLASS-F; ELECTRICAL AGEING; ELECTRICAL FIELD STRENGTH; ELECTRICAL STRESS; ESTIMATED PARAMETER; GENERATOR STATOR WINDINGS; HIGH VOLTAGE STATOR WINDINGS; HIGH-VOLTAGE STRESS; INSULATION SYSTEM; LIFE ESTIMATION; LIFETIME ESTIMATION; OPERATION TEMPERATURE; STATOR WINDING; TYPE TESTS;

ELECTRIC MACHINERY; ESTIMATION; HYDROELECTRIC GENERATORS; INSULATION; MICA; PARAMETER ESTIMATION; POWER ELECTRONICS; STATORS; TESTING; THERMAL INSULATION; THERMAL STRESS; WINDING;

ELECTRIC WINDINGS;

EID: 81255210220     PISSN: None     EISSN: None     Source Type: Conference Proceeding    
DOI: 10.1109/DEMPED.2011.6063639     Document Type: Conference Paper

References (22)

1. J. Sierra and I.J. Pérez-Arriaga, "Unity for All," IEEE Power and Energy Magazine. vol. 7, no. 5, pp. 18- 25, September/October 2009.
2. F. Kielmann and M. Kaufhold, "Evaluation Analysis of Thermal Ageing in Insulation Systems of Electrical Machines - A Historical Review," IEEE Transaction on Dielectrics and Electrical Insulation, Vol. 17, no 5, pp. 1373-1377, October 2010.
3. M.B. Srivinas, T.S. Ramu, "Multifactor Aging of HV Generator Stator Insulation Including Mechanical Vibrations," IEEE Tranaction on Electrical Insulation, vol. 27, no. 5, pp. 1009-1021, October 1992.
4. G.C. Stone 1993, "The Statistics of Aging Models and Practical Reality," IEEE Transactions on Electrical Insulation, vol. 28, no. 5, pp. 716-728, October 1993.
5. G.C. Stone, H.G. Sedding, B.A. Lloyd and B.K. Gupta, "The Ability of Diagnostic Tests to Estimate The Remaining Life Time of Stator Winding Insulation," IEEE Transactions on Energy Conversion, vol. 3, no. 4, pp. 833-841, December 1988.
6. C. Sumerer, "Statistical Lifetime of Hydro Generators and Failure Analysis," IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 15, no. 3, pp. 678-685, June 2008.
7. O. Stephanson, "What is wrong with our Hydro Generators, "Waterpower, pp. 2313-2316, 1987.
8. G.C. Montarini and L. Simoni, "Aging Phenomenology and Modeling," IEEE Transactions on Electrical Insulation, vol. 28, no. 5, pp. 755-776, October 1993.
9. J.K. Nelson and S. Azizi-Ghannad, "Theory and Application of Dynamic Aging for Life Estimation in Machine Insulation," IEEE Transactions on Dielectrics and Electrical Insulation, vol. 7, no. 6, pp. 773-782, December 2000. (Pubitemid 32136413)
10. R. Bartnikas and R. Morin, "Multi-Stress Aging of Stator Bars with Electrical, Thermal, and Mechanical Stresses as Simultaneous Acceleration Factors," IEEE Transactions on Energy Conversion, vol. 19, no. 4, pp. 702-714, December 2004.
11. J.E. Timperley and J.R. Michalec, "Estimating the Remaining Service Life Time of Asphaltic-mica Stator Insulation," IEEE Transactions on Energy Conversion, vol. 9, no. 4, pp. 686-693, December 1994.
12. R. Morin, J. P. Novak, R. Bartnikas and R. Ross, "Analysis of In-Service Aged Stator Bars," IEEE Transactions on Energy Conversion, vol. 10, no. 4, pp. 645-652, December 1995.
13. C. Sumerer and T. Weiers, "Significance of Defects Inside In-Service Aged Winding Insulations," IEEE Transactions on Energy Conversion, vol. 23, no. 1, pp. 9-14, March 2008. (Pubitemid 351392293)
14. T. W. Dakin, "Electrical Insulation Deterioration Treated as a Chemical Rate Phenomena," AIEE Transaction, Part 1, 1948.
15. Z Jia, X Peng, Z Guan, L Wang and B Yue, "Evaluation of the Degradation of Generator Stator Ground Wall Insulation Under Multistress Aging," IEEE Transactions on Energy Conversion, vol. 23, no. 2, pp. 474-483, June 2008. (Pubitemid 351728788)
16. G. Stone, E. A. Boulter, I. Culbert and H. Dhirani, "Electric Insulation for Rotating Machines - Design, Evaluation, Aging, Testing, and Repair," New Jersey: Wiley-Interscience, pp. 137-179, 2004.
17. CIGRE, "Hydrogenerator Failures - Results of the Survey," CIGRE Study Committee SC11, EG11.02, 2002.
18. V. Kokko "Electrical Aging in Lifetime Estimation of Hydroelectric generator stator windings," ICEM 2010 Conference, September 2010.
19. V. Kokko, "Failure Risk Estimation for Hydroelectric Generator Using Condition Index," Conference ViennaHydro 2010, November 2010, Austria Vienna.
20. M. Bélec and C. Hudon, "Long term Aging Test on Stator Bars exposed to End Arm Discharges," IEEE conf. on Electrical Insulation and Dielectric Phenomena, San Fransisco, pp. 829-832, October 1996.
21. Recommended Practice for Voltage-Endurance Testing of Form-Wound Bars and Coils, IEEE Standard 1043-1996.
22. Functional testing of insulation systems - Test procedures for form-wound windings - Multifactor functional evaluation - Endurance under combined thermal and electrical stresses of insulation systems used in machines up to and including 50 MVA and 15 kV