Insulation-system diagnostics for rotating machines

IEEE Electrical Insulation Magazine

Volumn 29, Issue 4, 2013, Pages 24-33

  McDermid, W ^a  

^a MANITOBA HYDRO   (Canada)

Author keywords

insulation; insulation diagnostics; John Tanaka; rotating machine

Indexed keywords

INSULATION DIAGNOSTICS; JOHN TANAKA; ROTATING MACHINE;

ROTATING MACHINERY;

INSULATION;

EID: 84880304953     PISSN: 08837554     EISSN: None     Source Type: Journal    
DOI: 10.1109/MEI.2013.6545257     Document Type: Article

References (176)

1. E. M. Fort and H. E. Pietsch, "Aging of insulation by thermal and electrical stresses," Proceedings of 12th Electrical/Electronics Insulation Conference, November 1975, pp. 143-146.
2. K. Shibayama and T. Kitagawa, "Mechanical fatigue strength of micaeous composite insulation," Proceedings of the 13th Electrical/Electronics Insulation Conference, September 1977, pp. 179-182. (Pubitemid 8604836)
3. W. H. Parriss, "Evaluation of A.C. motor insulation systems by IEEE 117: Water immersion or 100% RH as the conditioning cycle?" Proceedings of the 14th Electrical/Electronics Insulation Conference, October 1979, pp. 90-95. (Pubitemid 10451190)
4. R. J. Lawrence and H. C. Lauroesch, "Voltage endurance studies on insulation systems," Proceedings of the 15th Electrical/Electronics Insulation Conference, October 1981, pp. 82-84. (Pubitemid 12482541)
5. P. M. Silverberg, "Thermal aging of synchronous rotor poles," Proceedings of 15th Electrical/Electronics Insulation Conference, October 1981, pp. 92-96.
6. H. N. Galpern, "A new thermal aging facility for the evaluation of generator stator insulation systems," Proceedings of the 16th Electrical/Electronics Insulation Conference, October 1983, pp. 258-263. (Pubitemid 14458600)
7. P. M. Silverberg, "Irradiated synchronous rotor poles," Proceedings of 16th Electrical/Electronics Insulation Conference, October 1983, pp. 264-267.
8. V. R. Mulhall, "Multi-factor testing in the laboratory as a basis for diagnostic testing in the field," Proceedings of the 18th Electrical Electronics Insulation Conference, October 1987, pp. 135-141.
9. B. K. Gupta, "Development of a type test for turn insulation in motor coils," Proceedings of 20th Electrical Electronics Insulation Conference, October 1991, pp. 50-54.
10. S. E. Cherukupalli, G. L. Halldorson, H. E. Orton, and B. Huggins, "Electric field enhancement studies on stator windings with defect sites using finite-element computation," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 345-351.
11. J. E. Timperley, "Verification of insulation temperature class through weight loss measurements," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 553-556.
12. F. T. Emery and R. F. Weddleton, "Voltage endurance test facility for electric generator stator coils," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 557-561.
13. R. H. Rehder, B. J. Moore, and R. E. Draper, "Experience gained performing thermal cycling tests," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 563-567.
14. J. M. Braun, B. K. Gupta, and H. G. Sedding, "Quality assurance testing for large air-cooled generator stator winding insulation," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1995, pp. 691-695.
15. C. Hudon, J. N. Suin, N. Amyot, and N. Kandev, "Turn insulation aging of motors exposed to fast pulses of inverter drives," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 413-417.
16. J. E. Timperley and J. D. Mandeville, "Heater plate design for voltage endurance testing," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 623-625.
17. J. E. Timperley and G. W. Gooding, "Application of a corona resistant polyimide film in a high voltage motor," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 593-596.
18. R. E. Draper and B. J. Moore, "Development of a vertical generator stator bar insulation system for operation at increased stress," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 597-602.
19. W. McDermid, "A utility's evaluation of a stator bar insulation system operating at increased electric stress," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 603-605.
20. J. E. Timperley, B. Nindra, and S. A. Filliben, "Performance evaluation of pump generator stator coils with corona resistant polyimide film," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 46-49. (Pubitemid 46090912)
21. C. Millet, M. Bec, and C. Guddemi, "Comparative AC and DC voltage endurance tests performed on roebel bars," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 473-477.
22. S. Ul Haq and R. Omanipour, "Accelerated life testing of high voltage stator coils with enhanced PET-mica insulation system," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 478-481.
23. H. Provencher, C. Hudon, and E. David, "Thermal and thermomechanical aging of epoxy mica insulated stator bars," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 482-486.
24. G. C. Stone and B. S. Bernstein, "Towards assessing the remaining life of rotating machine insulation," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 71-75.
25. K. Kimura, T. Iwabuchi, K. Morooka, and Y. Ishikawa, "Assessment of remaining insulation life of high voltage induction motors," Proceedings of 19th Electrical Electronics Insulation Conference, September 1989, pp. 295-299. (Pubitemid 20664448)
26. J. E. Timperley, "Generator upgrade without stator rewinding," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 617-618.
27. Y. Nyanteh, L. Graber, C. Edrington, S. Srivastava, and D. Cartes, "Overview of simulation models for partial discharge and electrical treeing to determine feasibility for estimation of remaining life of machine insulation systems," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 327-332.
28. T. Klamt, T. Hillmer, and F. Vannay, "Assessment of insulation condition of hydro generator stator bars after 40 years in service," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 244-248.
29. H. A. Wroblewski, W. J. Day, and M. L. Donnell, "Evaluation of slot wedge material," Proceedings of 13th Electrical/Electronics Insulation Conference, September 1977, pp. 186-187
30. D. Hyndman, P. Lonseth, L. Kohn, and P. V. Ronca, "TwintoneTM bar/slot interface to maximize the benefits of modern high voltage stator ground insulation," Proceedings of 15th Electrical/Electronics Insulation Conference, October 1981, pp. 35-40. (Pubitemid 12482551)
31. T. Dautenhahn, "Failure modes of electrical coils in wet environment with voltage stress," Proceedings of 16th Electrical/Electronics Insulation Conference, October 1983, pp. 268-270. (Pubitemid 14458602)
32. J. F. Lyles, "Procedure and experience with thermoset stator rewinds of hydraulic generators," Proceedings of 17th Electrical/Electronics Insulation Conference, October 1985, pp. 244-254. (Pubitemid 16616580)
33. R. C. Arbour and B. Milano, "Diagnosing high-potential test failures in large water-cooled hydrogenerators," Proceedings of 19th Electrical Electronics Insulation Conference, September 1989, pp. 228-233.
34. V. Kogan, F. Dawson, G. Gao, and B. Nindra, "Surface corona suppression in high voltage stator winding end turns," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1995, pp. 411-415.
35. A. Anton, "New developments in resin rich insulating systems for high voltage rotating machines," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 607-618.
36. C. V. Maughan, "Generator reliability as influenced by engineering design parameters," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 159-179. (Pubitemid 33120376)
37. F. T. Emery, "Stator coil insulation for modern air-cooled generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 185-188. (Pubitemid 33120378)
38. M. L. Miller, "Static excitation resistant rotor insulation for turbine generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 203-207. (Pubitemid 33120382)
39. F. T. Emery and J. D. B. Smith, "Next generation insulation for high operating stress," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 209-212. (Pubitemid 33120383)
40. C. V. Maughan, "Inspection/test impact on maintenance of generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 443-448.
41. F. T. Emery, "High dielectric performance stator winding insulation system for Global VPI'd air cooled generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 605-607.
42. C. V. Maughan, "Monitoring of generator condition and some limitations thereof," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 50-53. (Pubitemid 46090913)
43. P. Schlupp, D. Vizireanu, C. Milleville, F. Chiodi, and V. Prunier, "Experimentation on humidity propagation in high voltage alternator stator bar insulation," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
44. C. V. Maughan, "Generator condition monitor evolution and capability," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
45. C. Hudon, M. Bec, and D. N. Nguyen, "Innovative web system for condition-based maintenance of generators," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 234-245.
46. A. I. Bennett, "Endurance of electrical insulation under non-sinusoidal voltage stress," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 1-6a.
47. R. H. Rehder, "Preliminary evaluation of motor insulation for variable speed applications," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 333-336.
48. G. C. Stone and S. R. Campbell, "Development of an on-line monitor to measure motor voltage surges," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 397-399.
49. N. Foulon, J.-P. Lucas, G. Barr R. Mailfert, and J. Enon, "Investigation of the failure mechanism of insulation subjected to repetitive fast voltage surges," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 401-406.
50. G. C. Stone, S. R. Campbell, and M. Susnik, "New tools to determine the vulnerability of stator windings to voltage surges from IFDs," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 149-153.
51. T. Lebey, "Influence of some voltage waveform characteristics on the partial discharge patterns: Applications to a PWM power supply," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 627-630.
52. S. Ul Haq, S. H. Jayaram, and E. A. Cherney, "Degradation of turn insulation subjected to fast repetitive voltage pulses," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 163-166. (Pubitemid 46090937)
53. F. P. Espino-Cortes, S. H. Jayaram, and E. A. Cherney, "Effectiveness of stress control coatings in medium voltage form wound coil ends under fast rise time pulses and contamination," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 167-170. (Pubitemid 46090938)
54. S. Ul Haq, S. H. Jayaram, and E. A. Cherney, "Evaluation of medium voltage groundwall insulation exposed to high frequency pulse voltages," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 194-197. (Pubitemid 46090945)
55. F. P. Espino-Cortes, P. Gez Zamorano, and A. Reyes Rosario, "Effect of voltage distortion on stress grading coatings working at high fundamental frequency," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
56. G. C. Stone and M. K. W. Stranges, "New IEC standards for qualifying stator insulation systems for PWM converter drives," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
57. G. C. Stone and I. Culbert, "Partial discharge testing of random wound stators during short risetime voltage surges," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 188-191.
58. E. Sharifi, E. A. Cherney, and S. H. Jayaram, "Anisotropic dielectric properties of stress grading materials used in medium voltage formwound motor coils to study thermal effects of repetitive fast pulses," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 333-337.
59. M. Tozzi, G. C. Montanari, D. Fabiani, and A. Cavallini, "Off-line and on-line PD measurements on induction motors fed by power electronic impulses," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 420-424.
60. Y. T. Yu and S. H. Jayaram, "Form wound stator insulation system under different voltage waveform stresses," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 425-429.
61. C. Staubach, S. Kempen, and F. Jenau, "Computer aided design of an end corona protection system for accelerated voltage endurance testing at increased frequency," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 170-174.
62. E. Sharifi, S. Jayaram, E. A. Cherney, S. Ul Haq, and R. Omranipour, "IEC qualification test applied to capacitively graded 13.8 kV bar samples energized with repetitive fast pulses," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 401-405.
63. V. Mihaila, S. Duchesne, D. Roger, and P. Y. Liegeois, "Prediction of the turn-to-turn voltages in parallel connected wires configuration for motor coils fed by steep fronted pulses," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 406-411.
64. G. Gao and W. Chen, "Design challenges of wind turbine generators," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 146-152.
65. K. Alewine and W. Chen, "A review of electrical winding failures in wind turbine generators, (Alewine et al.)," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 392-396.
66. H. A. Wroblewski, J. E. Deering, and W. A. Pease, " Tangent delta vs today's insulation," Proceedings of 14th Electrical/Electronics Insulation Conference, October 1979, pp. 102-104.
67. C. Pinto and A. D. Mokashi, "Estimation of the void content in H.V. stator coil insulation," Proceedings of the 19th Electrical Electronics Insulation Conference, September 1989, pp. 310-314. (Pubitemid 20664451)
68. C. Pinto, "Variations in the capacitance of delaminated H.V. stator insulation due to electrostatically generated forces," Proceedings of 20th Electrical Electronics Insulation Conference, October 1991, pp. 65-69.
69. R. Omranipour and S. U. Haq, "Effect of stress grading systems and guarding techniques on measured power factor and power factor tip-up of electric machinery stator windings," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 414-419.
70. C. Pinto, "An improved method of detecting contamination of H.V. stator windings in the field," Proceedings of 20th Electrical Electronics Insulation Conference, October 1991, pp. 55-59.
71. C. Paynot, L. Lamarre, ?. David, R. Taghizad, "Use of transient current for evaluation of the condition of rotor and stator insulation systems of large synchronous rotating machines," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 78-81. (Pubitemid 46090918)
72. L. Lamarre, D. N. Nguyen, and . David, "Temperature and voltage dependence of dielectric properties of modern epoxy mica insulations of HV rotating machines," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
73. H. Zhu, "Insulation resistance measurements versus temperature made on aged stator bars and coils," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
74. E. David, L. Lamarre, and D. N. Nguyen, "Measurements of polarization/depolarization currents for modern epoxy-mica bars in different conditions," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
75. B. Milano, E. Eastment, and B. Weeks, "New insights and complications in determining stator insulation absorption current exponents and constants from polarization index test data," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 254-258.
76. R. Soltani, E. David, and L. Lamarre, "Study on the effect of humidity on dielectric response and partial discharges activity of machine insulation materials," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 343-347.
77. S. A. Bhumiwat, "Field experience in insulation diagnosis of industrial high voltage motors using dielectric response technique," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 454-457.
78. L. Lamarre, . David, and A. Na?, "Comparison of DC ramp and DC step test results on hydro generator stators," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 468-472.
79. S. A. Bhumiwat, "Insulation resistance and polarization of rotating machines," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 249-253.
80. A. Brown, E. David, and M. Essalihi, "Insulation resistance measurements for machine insulation," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 261-264.
81. W. McDermid, "Utility program for monitoring the condition of large generator stator insulation systems," Proceedings of 15th Electrical/Electronics Insulation Conference, October 1981, pp. 41-45. (Pubitemid 12482550)
82. J. E. Timperley, "Detection of insulation deterioration through electrical spectrum analysis," Proceedings of 16th Electrical/Electronics Insulation Conference, October 1983, pp. 60-64.
83. M. Kurtz, J. F. Lyles, and G. C. Stone, "Experience with the CEA generator insulation partial discharge test," Proceedings of 16th Electrical/Electronics Insulation Conference, October 1983, pp. 65-68. (Pubitemid 14458556)
84. J. W. R. Smith, "Proposed method for 'in-service' monitoring of stator winding insulation of large H.V. motors," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 82-86.
85. A. Wilson, "Stator winding testing using partial discharge techniques," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 87-91.
86. W. McDermid and J. C. Bromley, "Monitoring rotating machine insulation using the CEA PDA through the use of directional couplers," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 120-124.
87. R. C. Arbour and B. Milano, "Development of a stationary partial discharge monitoring system for high-voltage rotating machine stator windings," Proceedings of 19th Electrical Electronics Insulation Conference, September 1989, pp. 212-214. (Pubitemid 20664430)
88. R. C. Tychsen, "Initial experience in the Snowy Mountains scheme with the PDA and installation and use of permanent capacitive couplers on hydro generators," Proceedings of 19th Electrical Electronics Insulation Conference, September 1989, pp. 219-224.
89. G. C. Stone and H. G. Sedding, "New technology for partial discharge testing of operating generators and motors," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 667-672.
90. Z. Berler, I. Blokhintsev, M. Golovkov, A. Golubev, C. Kane, T. Nime, D. Parks, and J. Plesko, "Practical methods of on-line partial discharge measurements on medium voltage motors and generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 91-95.
91. T. E. Laird, J. Fiaux, and T. Bertheau, "Periodic on-line partial discharge measurements on air cooled and gas cooled generators of similar design," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 101-105.
92. J. C. Bromley and W. McDermid, "Recent experience with directional couplers for partial discharge measurements on hydrogen cooled rotating machines in a noisy environment," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1997, pp. 107-110.
93. H. G. Sedding, B. K. Gupta, I. M. Culbert, H. Dhirani, G. Klempner, and G. Haines, "Experience with partial discharge measurements on rotating machines at Ontario Hydro," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 179-184.
94. T. Tsurimoto, K. Itoh, Y. Kaneda, A. Sumida, S. Kuroki, T. Ohsawa, and H. Tanaka, "Development of partial discharge monitor for turbine generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 185-189.
95. M. Hoof and S. Lanz, "PD diagnostics on rotating machines possibilities and limitations," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 195-200.
96. T. Bertheau, M. Hoof, and T. Laird, "Permanent on-line partial discharge monitoring as strategic concept to condition based diagnosis and maintenance," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 201-203.
97. Z. Berler, I. Blokhintsev, A. Golubev, G. Paoletti, and A. Romashkov, "RTD as the valuable tool in partial discharge measurements on rotating machines," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 205-210.
98. H. J. van Breen, E. Gulski, J. J. Smit, H. F. A. Verhaart, W. de Leeuw, and M. Krieg-Wezelenburg, "Standardizing the interpretation of on-line VHF PD measurements on turbo generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 399-403. (Pubitemid 33120418)
99. H. Zhu, V. Green, M. Sasic, and A. Jakubik, "Partial discharge database: its benefits and limitations on assessment of stator insulation deterioration," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 405-409. (Pubitemid 33120419)
100. M. Hoof and T. Laird, "Assessed condition trending system (ACTS) a tool for generator on-line diagnostics," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 411-416. (Pubitemid 33120420)
101. M. Fenger, G. C. Stone, and B. A. Lloyd, "Experience with continuous partial discharge monitoring of stator windings," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 417-421. (Pubitemid 33122714)
102. K. Younsi, D. Snopek, J. Hayward, P. Mard, and J. C. Pellerin, "Seasonal changes in partial discharge activity on hydraulic generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 423-428. (Pubitemid 33120421)
103. C. Hudon, W. Torres, M. B?ec, and R. Contreras, "Comparison of discharges measured from a generator's terminals and from an antenna in front of the slots," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 533-536. (Pubitemid 33120441)
104. I. M. Culbert, H. Dhirani, and B. K. Gupta, "On-line measurement of partial discharges on large motors in a generating station," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 537-540. (Pubitemid 33120442)
105. A. Cavallini, M. Conti, G. C. Montanari, A. Contin, and F. Puletti, "Partial discharge cross-talk recognition in rotating machines by pulseshape analysis: preliminary results," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 33-37.
106. H. J. van Breen, E. Gulski, J. J. Smit, H. F. A. Verhaart, and W. de Leeuw, "Pitfalls of on-line PD measurements on turbo generators using external PD sensors," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 39-42.
107. H. J. van Breen, E. Gulski, and J. J. Smit, "Partial discharge weak spots localization in stator insulation of running turbo generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 43-46.
108. M. Fenger and G. C. Stone, "How humidity affects partial discharge activity in stator windings," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 47-50.
109. M. Hoof and T. Laird, "A strategy for advanced condition based maintenance of large generators," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 463-468.
110. J. E. Timperley, "Audio spectrum analysis of EMI patterns," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
111. M. Bec, S. Li, D. N. Nguyen, L. Line, C. Guddemi, D. Lessard-Diel, T. Schwartz, and L. Lamarre, "Investigation and diagnosis of a 184 MVA air-cooled generator heavily affected by slot partial discharge activity," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
112. C. Millet, D. N. Nguyen, L. Line, M. Bec, D. Lessard-Diel, and C. Guddemi, "Case study-High ozone concentration in hydro generators," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 178-182.
113. G. C. Stone, S. R. Campbell, and H. G. Sedding, "Characteristics of noise and interphasal PD pulses in operating stator windings," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 15-19.
114. P. Neti, P. Zhang, X. Qi, Y. Zhou, K. Younsi, M. R. Shah, and K. Weeber, "Online detection of endwinding contamination in industrial motors," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 265-270.
115. W. McDermid and T. Black, "Tracking stator bar condition by online partial discharge measurements," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 323-326.
116. Y. Asiri, A. Vouk, L. Renforth, D. Clark, and J. Cooper, "Neural network based classification of partial discharges in HV motors," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 333-339.
117. C. V. Maughan, "Electromagnetic interference (EMI) testing of electrical equipment," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 340-344.
118. A. Wichmann, "Evaluation of rotating machinery insulation by partial discharge pulse testing," Proceedings of 16th Electrical Electronics Insulation Conference, October 1983, pp. 271-274. (Pubitemid 14458603)
119. J. W. R. Smith, "Some advances in electrical diagnostic testing of generators and large A.C. motors," Proceedings of 17th Electrical/ Electronics Insulation Conference, October 1985, pp. 297-301. (Pubitemid 16616591)
120. G. Rabach, A. Contin, and F. Tosato, "On the meaning of partial discharge pattern detection in AC rotating electrical machinery windings," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 7-12.
121. I. J. Kemp, B. Gupta, and G. Stone, "Calibration difficulties with partial discharge detectors in rotating machine applications," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 92-97.
122. A. Wilson, "Slot discharges in air-cooled stator windings," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 125-129.
123. H. G. Sedding and G. C. Stone, "A discharge locating probe for rotating machines," Proceedings of 19th Electrical Electronics Insulation Conference, September 1989, pp. 225-227. (Pubitemid 20664433)
124. J. E. Timperley, "Improvements in corona probe testing of modern hydroelectric generators," Proceedings 19th Electrical Electronics Insulation Conference, September 1989, pp. 300-304.
125. E. Gulski, H. J. van Breen, P. N. Seitz, and P. Schikarski, "Partial discharge detection in generator stator insulation using oscillating voltage waves," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 331-334. (Pubitemid 33120406)
126. R. Koch, F. Pohlmann, and J. R. Weidner, "A new diagnostic tool for preventive maintenance on large generators-PD location in stator windings by traveling wave method," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 71-77. (Pubitemid 46090917)
127. A. Cavallini, G. C. Montanari, F. Puletti, A. Calonico, and A. Perich, "Improvement of rotating machine production standards by infactory partial discharge testing," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 131-135. (Pubitemid 46090930)
128. F. T. Emery, "Reduction techniques of partial discharge, dissipation factor, and external corona for high voltage stator windings," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 315-327.
129. A. Contin and H. Al-Marzouqi, "Searching for partial discharge patterns for the identification of defects of insulation systems in AC rotating machines," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 405-408.
130. R. Candela and A. Contin, "A portable instrument for location and identification of defects generating PD," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 468-472.
131. J. E. Timperley and D. A. Klinect, "Acoustic spectrum analysis of high voltage mica based insulation systems," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1995, pp. 599-603.
132. J. C. Bromley and W. McDermid, "Improvements to partial discharge screening test for stator bars and coils," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1995, pp. 609-612.
133. S. Cherukupalli, G. L. Halldorson, and C. Tan, "Comparative measurements of two partial discharge measurements used for form wound coils/bars as quality assurance tests," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 541-545.
134. M. Bec, C. Hudon, and C. Guddemi, "Laboratory study of slot discharge characteristic PRPD patterns," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 547-550. (Pubitemid 33120444)
135. C. Hudon, M. Chaaban, M. Bec, and D. N. Nguyen, "Effect of temperature and thermal expansion on slot partial discharge activity," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
136. H. Zhu and D. Kung, "Acoustic monitoring of insulation delaminations during thermal cycling tests on a stator bar," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 183-187.
137. M. Lesque, C. Hudon, M. Bec, and ?. David, "Measurement of slot partial discharges with an antenna during accelerated aging," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 458-462.
138. W. McDermid, J. C. Bromley, and T. Black, "Update on partial discharge screening tests for stator bars & coils," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 20-22.
139. T. L. Churchill and J. S. Edmonds, "Rotor-mounted scanning of distressed armatures in hydrogenerators," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 76-81.
140. J. S. Edmonds, "Rotor-mounted scanners for hydroelectric generators," Proceedings of 19th Electrical Electronics Insulation Conference, September 1989, pp. 215-218.
141. T. L. Churchill, J. S. Edmonds, and C. W. Burns, "Rotor-mounted scanning of stators in hydro and turbine-driven generators," Proceedings of 20th Electrical Electronics Insulation Conference, October 1991, pp. 38-46.
142. J. S. Edmonds, G. C. Stone, and T. H. Campbell, "Advanced methods for continuous insulation condition monitoring on hydrogenerators," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, 685-690.
143. G. Gao, M. Steinhauser, R. Kavanaugh, and W. Chen, "Using fiberoptic sensors to measure strain in motor stator end windings during operation," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 645-648.
144. J. Demcko, J. Velotta, and A. Tesla, "Generator end turn vibration monitoring-A case study," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
145. C. V. Maughan, "Vibration detection instrumentation for turbinegenerator stator endwindings," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 173-177.
146. P. Kung, L. Wang, and M. I. Comanici, "Stator end winding vibration and temperature rise monitoring," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 10-14.
147. G. L. Shook and D. E. Schump, "Surge comparison testing of rotating machines," Proceedings of the 13th Electrical/Electronics Insulation Conference, September 1977, pp. 137-140.
148. K. J. Cornick, "Steep-fronted impulse voltage testing of machine stator coils," Proceedings of 17th Electrical Electronics Insulation Conference, October 1985, pp. 4-8. (Pubitemid 16616528)
149. D. E. Schump, "Improved detection method for winding surge tests of large AC motors," Proceedings of 19th Electrical Electronics Insulation Conference, October 1989, pp. 292-294.
150. S. Schlichting, "Automated digital winding test analysis methods," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 539-543.
151. B. Gupta, "Risk in surge testing of turn insulation in windings of rotating machines," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 459-462.
152. I. Kerszenbaum and C. Maughan, "Utilization of repetitive surge oscillograph (RSO) in the detection of rotor shorted-turns in large turbine-driven generators," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 397-400.
153. H. G. Sedding and W. K. Hogg, "Implications of the overvoltage test for non-destructive evaluation in large machines," Proceedings of 18th Electrical Electronics Insulation Conference, October 1987, pp. 130-134.
154. P. H. Reynolds and B. H. Ward, "An alternative to DC test equipment for performing off-line diagnostic testing on large rotating machines," Proceedings of 20th Electrical Electronics Insulation Conference, October 1991, pp. 47-49.
155. A. Audoil and J.-L. Drommi, "Advantages of high voltage DC dielectric tests compared with AC tests," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1993, pp. 661-665.
156. B. K. Gupta, "Use of AC and DC hipot tests to assess condition of stator insulation," Proceedings: Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 1995, pp. 605-608.
157. W. McDermid and B. G. Solomon, "Significance of defects found during high direct-voltage ramp tests," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 1999, pp. 631-636.
158. B. K. Gupta, G. C. Stone, and J. Stein, "Use of machine hipot testing in electric utilities," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 323-326. (Pubitemid 33120404)
159. W. McDermid and J. C. Bromley, "Response of ramp test to delamination in stator groundwall insulation," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 327-329. (Pubitemid 33120405)
160. S. Bomben, H. Sedding, J. DiPaul, and R. Glowacki, "Experience with high potential testing hydro generator multi turn stator coils using 60 Hz, dc and VLF (0.1 Hz)," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 435-438.
161. J. E. Timperley and J. R. Michalec, "Stator winding replacement based on overpotential testing," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 439-442.
162. H. G. Sedding, R. Schwabe, D. Levin, J. Stein, and B. K. Gupta, "The role of AC & DC hipot testing in stator winding ageing," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 455-457.
163. F. T. Emery, "Considerations of AC and DC testing of large electrical stator windings and components," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 42-45. (Pubitemid 46090911)
164. W. M. McDermid and J. C. Bromley, "Ramp test development and data acquisition," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 126-130. (Pubitemid 46090929)
165. W. McDermid and R. Gamblin, "Use of ramp test to expedite return to service of damaged stator winding," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2007.
166. B. K. Gupta, G. C. Stone, and J. Stein. "Stator winding hipot (high potential) testing," Proceedings of 29th Electrical Insulation Conference, June 2009, pp. 409-413.
167. C. D. Rickson, "A new technique for core lamination testing," Proceedings of 17th Electrical Electronics Insulation Conference, October 1985, pp. 239-243. (Pubitemid 16616579)
168. J. W. R. Smith, "Some advances in electrical diagnostic testing of generators and large A.C. motors," Proceedings of 17th Electrical Electronics Insulation Conference, October 1985, pp. 297-301. (Pubitemid 16616591)
169. S. G. Bomben and B. Pratt, "Experience repairing a serious stator core fault on an 80 MVA vertical water wheel generator," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2005, pp. 67-70. (Pubitemid 46090916)
170. D. R. Bertenshaw, J. F. Lau, and D. J. Conley, "Evaluation of EL CID indications not associated with stator core interlaminar insulation faults," Proceedings of 30th Electrical Insulation Conference, June 2011, pp. 254-260.
171. J. S. Chan, "A potentiometer and voltage gradient method for locating ground faults in a wound electrical machine stator," Proceedings of the 13th Electrical/Electronics Insulation Conference, September 1977, pp. 134-136.
172. I. Cubert, H. G. Sedding, and G. C. Stone, "A method to estimate the insulation condition of high voltage stator windings," Proceedings of 19th Electrical Electronics Insulation Conference, September 1989, pp. 236-241. (Pubitemid 20664435)
173. B. A. Lloyd, G. C. Stone, and J. Stein, "Development of an expert system to assess machine insulation condition," Proceedings of 20th Electrical Electronics Insulation Conference, October 1991, pp. 33-37.
174. B. A. Lloyd and G. C. Stone, "Prospects for expert systems to aid the operation and maintenance of electrical equipment," Proceedings of 20th Electrical Electronics Insulation Conference, October 1991, pp. 205-209.
175. H. W. Penrose, "Evaluation of electric motor condition using motor circuit analysis," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, October 2001, pp. 335-340. (Pubitemid 33120407)
176. H. W. Penrose, "Estimating motor life using motor circuit analysis predictive measurements," Proceedings: Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference, September 2003, pp. 451-454.