Assessment of Stator Winding Insulation. Part 1 - Review of Deterioration Mechanisms and Condition Monitoring Techniques

##plugins.themes.academic_pro.article.main##

B. Nageshwar Rao
K. Mallikarjunappa
J. Sundara Rajan
B. Ramachandra
A. Sudhindra

Abstract

This paper reviews the main ageing and failure mechanisms of stator winding and methods for extending the useful life of the machine. The symptoms for each failure mechanism are discussed and an overview of various electrical diagnostic techniques for condition assessment of stator winding insulation is presented

##plugins.themes.academic_pro.article.details##

How to Cite
Nageshwar Rao, B., Mallikarjunappa, K., Sundara Rajan, J., Ramachandra, B., & Sudhindra, A. (2010). Assessment of Stator Winding Insulation. Part 1 - Review of Deterioration Mechanisms and Condition Monitoring Techniques. Power Research - A Journal of CPRI, 61–76. Retrieved from https://cprijournal.in/index.php/pr/article/view/686

References

  1. Wichmann A. “Two Decades Experience and Progress in Epoxy Mica Insulation Systems for Large Rotating Machines”, IEEE Trans. PAS, pp. 74–82, 1983.
  2. State of the art report “Dielectric Diagnosis of Electrical Equipment for AC applications and its Effects in Insulation Co-ordination”, Presented by working group 33/15.08 CIGRE 1990.
  3. Simons J S. “Diagnostic Testing of High Voltage Machine Insulation”, IEE Proceedings, Vol. 127, part B, No. 3, 1980.
  4. Kelen A. “Diagnostics of HV Machine Insulation from Inspection to Continuous Monitoring”, CIGRE Symposium 05-97, Section 10-2, 1987.
  5. Kurtz M. et. al, “Diagnostic Testing of Generator Insulation without Service Interruption”, Paper 11-09, CIGRE Intl. Conf on Large High Voltage Electric System, Part B, 1980.
  6. Stark K H. “ Assessment of the Insulation Serviceability of Turbo Generator Stators and of HV bushings”, IEE Proceedings A, Vol. 109, 1962 pp. 71–1988.
  7. Binder. “Techniques of Partial Discharge Measurements for Stator Winding of Generators, CIGRE Symposium, S 05–87, 1987.
  8. Stone G C. “Toward Assessing the Remaining Life of Rotating Machine Insulation, Proceedings 18th, IEEE Conference on Ele. Ins., 1987, pp. 71–75.
  9. Cameron A W. “Diagnosis of AC Generator Insulation Condition by Nondestructive Tests. Trans. of the American IEE 1952, Part III., pp. 263–269.
  10. Simoni L. “Life models for Insulating Material under Combined Thermal-electric Stress”, Colliquim of Professional Committee of IEE, Group-52, Dec. 1980.
  11. Ramu T S. “On the Estimation of Life of Power Apparatus Insulation Under Combined Electrical and Thermal Stresses”, IEEE Trans. on Ele. Ins., Vol. 20, pp. 70–78, 1985.
  12. Srinivas M B and Ramu T S. “Multifactor Ageing of HV Generator Stator Insulation Including Mechanical Vibrations”, IEEE Trans. on Elec. Ins. Vol. 25, No. 5, Oct. 1992.
  13. Zhidong Jia, Yanpeng Hao and Hengkun Xie. “The Degradation Assessment of epoxy/mica Insulation under Multi-stresses Ageing”, Dielectrics and Electrical Insulation, IEEE Transactions, Vol. 13, Issue 2, April 2006 Page(s): 415–422.
  14. Montanari G C and Mazzanti G. “Insulation Ageing and Life Models”, Wiley Encyclopedia of Electrical and Electrical Engineering, J Wiley and Sons, 1999.
  15. Cygan P and Laghari J R. “Models for Insulation Ageing under Electrical and Thermal Multistress”, IEEE Trans. Ele. Ins. Vol. 25, 1990.
  16. Allan D, Blackburn T R and Sheehy R. "Methodologies and Models to Improve the Reliability of Service Aged Electrical Insulation” CIGRE, 15-03, Session 2002.
  17. Hepburn D M, Kemp I J and Shields A J. “Mica,” IEEE Electrical Insulation Magazine, September/October 2000, Vol. 16, No. 6, pp. 1924.
  18. Tanaka T. “Ageing of Polymeric and Composite Insulating Materials”, IEEE Trans of Dielectrics and E.I. Vol. 9, No. 5, 2002.
  19. Peter H F Morshuis. “Degradation of Solid Dielectrics due to Internal Partial Discharge: Some Thoughts on Progress Discharge Amplitude Distribution with Dielectric Damage at Different Levels of Voltage and Frequency”, IEEE Intl. Sym on EI Conf. Record # 82 pp. 79–84, 1982.
  20. Megahed I Y. “ The Discharge Repetition Rates in Cavities in Epoxy Resins, Polyethylene and Mica under AC Conditions”, IEEE Trans on EI. Vol. 10 pp. 69–74, 1975.
  21. Holboll J H and Henrisksen M. “Partial Discharge Patterns Relation to Surface Deterioration in Voids in Epoxy”, IEEE Intl. Sym on E.I. Conf Record # 90, pp. 115–119, 1990
  22. Xiaolin Chen, Yonghong Cheng, Bo Yueand Hengkun Xie. “Study of Epoxy/ mica Insulation Deterioration in Generator Stator using Ultra-wide Band Partial Discharge Testing Technique”, Journal Polymer Testing, Vol. 25, pp. 724–730, ISSN 0142-9418, 2006.
  23. Hoof M and Lanz S. “PD Diagnostics on Rotating Machines, Possibilities and Limitations”, Ele. Ins. Conference, 1999.
  24. Wichmann A. “AC and DC Methods for the Evaluation and Maintenance Testing of HV Insulation in Electrical Machines”, IEEE Trans. on Power Apparatus and System, Vol. 82, pp. 273–281, 1963.
  25. Schuller R H and Liptak. “Long Time Functional Tests on Insulation Systems for HV Rotating Machines”, CIGRE Vol. 1 1976, paper 15-05.
  26. Liptak G and Schuler R H. “Experience with Diagnostic and Monitoring Methods on Generator Windings in Relation to Remaining Service Life”, CIGRE Paper 11-304, 1992.
  27. Yoshida H and Inoue. IEEE Tans. On E.I. Vol. 21, No. 6 Dec. 1986.
  28. IEEE 56-1977 “Recommended Practice for Insulation Testing of AC Electric Machinery (2300 V and above) with AC High Voltage”.
  29. Cajetan Pinto. “A Generalized Approach for the Study of the Non-linear Behaviour of Stator Winding Insulation”, IEEE Intl. conference on conduction and breakdown in solid dielectric, Sweden, 1998.
  30. Rushall T T and Simons J S. “An Examination of High Voltage DC Testing Applied to Large Stator Windings”, Proc. IEE, Part A, Power Engineering, Oct. 1955.
  31. “Recommended Practice for Insulation testing of AC Electric Machinery (2300 V and above) with High Direct Voltage”. IEEE 95-2002,
  32. Rux L M. “High Voltage DC Tests for Evaluating Stator Winding Insulation: Uniform Step, Graded Step and Ramped Test Methods”, IEEE Annual Report – Conference on Ele. Ins. and Dielectric Phenomena, 1997.
  33. “Recommended Practice for testing Insulation Resistance of Rotating Machinery”. IEEE 43-2000.
  34. Sedding H G. “Application of Low Frequency Techniques for Stator Insulation Diagnostics” Iris Rotating Machine Conference, June 2002, San Antonio, TX.
  35. Cherukupalli S et al. “Application of Some Novel Non-destructive Diagnostic Tests for Condition Assessment of Stator coils and Bars following Voltage Endurance Tests”, Conf. Record of 2002 IEEE International Symposium on Electrical Insulation, Boston, MA, pp. 565–569.
  36. “Recommended Practice for Measurement of Power Factor Tip-up of Electric Machinery Coil Insulation”. IEEE 286-2000.
  37. Kelen A, “Critical Examination of the Dissipation Factor Tip-up as a Measure of PD intensity”, IEEE Trans. On E.I, March 1978.
  38. “Guide to the Measurement of Partial Discharges in Rotating Machinery”. IEEE 1434-2000.
  39. Dakin T.W, Malinaric P. J, “A Capacitive Bridge Method for Measuring Integrated Corona-charge Transfer and Power Loss Per Cycle”, AIEE Trans. On PAS. Vol. 79, Part III, pp. 648–653, 1960.
  40. Goffaux R. “Method for the Detection of Insufficient Dielectric Strength of Coil Insulation”, U.S. Patent, 1981.
  41. Terase H. “A New Current Testing Method for Non-destructive Insulation Tests”, IEEE Trans. On PAS, Vol. PAS-99, No. 4, July/Aug. 1980.
  42. Sedding H G, Campbell S R, Stone G C and Klemper G S. “A New Sensor for Detecting Partial Discharges in Operating Turbine Generators”, IEEE Trans EC, pp. 700, 1991.
  43. Sedding H G, Campbell S R and Stone G C. “On-line Partial Discharge Detection in Turbine Generators”, IEE Conference on Electrical Machines and Drives, U.K. Conf Publication, No. 341, pp. 250- 254
  44. Stone G C, Llyod B A, Sedding H G, Braun J M and Mannik. “Development of Monitors for Improved Machine Operation and Life Management Decision Making, Ontario Hydro”, Research Review Report, No. 6, June 1992.
  45. Forster J A and Lyle F Klataska. IEEE Tans. On PAS, Vol. PAS-100, No. 7, July 1981.

Most read articles by the same author(s)

1 2 > >>