DOI QR코드

DOI QR Code

A Study on Insulation Properties of Global VPI Type Generator through Replacement of Stator Windings

  • Kong, Taesik (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Kim, Heedong (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Lee, Sooho (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Park, Jaehyun (Korea Midland Power Corporation)
  • 투고 : 2017.02.19
  • 심사 : 2017.08.21
  • 발행 : 2017.12.30

초록

As the competition in the manufacturing market for small and medium sized generators is intensifying, there is increasing pressure to reduce production cost. Manufacturing the generator stator windings with global vacuum pressure impregnation (GVPI) is a very effective way to reduce costs. However, the stator winding has a fatal disadvantage in that the insulation wears due to vibration in the slot. KEPRI (KEPCO Research Institute) conducted insulation diagnosis for three generators in KOMIPO (Korea Midland Power Co., Ltd.) which were manufactured by GVPI and operated for about 17 years. Insulation diagnosis showed that deterioration of insulation has progressed significantly. Therefore, KEPRI recommended replacing the stator windings of all three generators. In this paper, the insulation properties of the generator stator winding with global GVPI are described by comparing and analyzing the insulation diagnosis results and visual inspection for stator windings.

키워드

참고문헌

  1. G.Ruelle, "Development of Large Air-Cooled Generators for Gas Turbines and Combined Cycles" CIGRE 1992 Session, pp. 1-6, 1992.
  2. A. P. Kopp, P. Rohn, B. Bislin, E. Mannisto, "Comparison of Maximum Rated Air- Cooled Turbo Generators with Modern Hydrogen Cooled Generators- Design and Experience", CIGRE 1992 Session 30, 1992.
  3. B. E. B Gott, "Application of Air Cooled Generators to Modern Power Plants", Proc IEEE International Electric Drives Conference, pp. 317-319, May 1999.
  4. Greg Stone "Problems with Modern Air-Cooled Generator Stator Winding Insulation" IEEE Electrical Insulation Magazine, pp. 6, 2000.
  5. Hee-Dong Kim, Tae-Sik Kong, Young-Ho Ju, Byong-Han Kim "Analysis of Insulation Quality in Large Generator Stator Windings", Journal of Electrical Engineering & Technology Vol. 6, No. 2, pp. 384-390, 2011. https://doi.org/10.5370/JEET.2011.6.2.384
  6. IEEE Standard "IEEE Recommended Practice for Testing Insulation Resistance of Rotating Machinery" IEEE std 43-2000, pp. 17, 2000.
  7. IEEE Standard "Trial-Use Guide to the Measurement of Partial Discharge in Rotating Machinery", IEEE Std 1434-2000, pp. 40, 2000.
  8. J.H. Dymond, N. Stranges, K. Younsi and J. E. Hayward, "Stator Winding Failures : Contamination, Surface Discharge, Tracking", IEEE Trans. on Industry Applications, Vol. 38, No. 2, pp. 577-583, 2002. https://doi.org/10.1109/28.993182