Aging and Recovery of HTV Silicone Rubber Used for Outdoor Insulator

옥외용 HTV 실리콘고무 절연재료의 열화 및 회복특성

  • Yeon, Bok-Hui (Dept.of Electronics Engineering, Inha University) ;
  • Heo, Chang-Su (Dept.of Electronics Engineering, Inha University) ;
  • Jo, Han-Gu (Korea Electrotechnology Research Institute)
  • Published : 2002.10.01

Abstract

This paper presents a study on the aging and recovery of HTV (high temperature vulcanized) silicone rubber used for outdoor insulators. UV irradiation, corona discharge and water immersion were employed as factors of the artificial aging. The effects of changes derived from these stresses on the tracking and arc resistance of silicone rubber were examined. We have investigated the aging phenomena of HTV silicone rubber by the above stresses using the surface energy calculation with contact angle measurement, solvent-extraction, and surface/volume resistivity and so on. These results showed that UV irradiation and corona discharge lead to nearly the same surface oxidation, but the percentage change of mobile low molecular weight by these stresses was different. Furthermore, the oxidized layer induced under UV irradiation restricted the recovery of hydrophobic surface. Water immersion little lowered hydrophobicity level and leaded to a loss of tracking and arc resistance. The degradation mechanism based on our results was discussed.

Keywords

Silicone rubber;Aging;Polymeric outdoor insulator;Tracking resistance;Arc resistance

References

  1. R.S. Gorur, E.A. Cherney, J.T. Burnham, Outdoor Insulators, Ravi S. Gorur Inc., pp.16-248, 1999
  2. G.E. O'Donnell, G.A. Toskey, 'silicone RTV protective coating for porcelain insulators', Dowcorning brochure, pp. 5-8, 1994
  3. 전력연구원 배전기술그룹, '배전용 폴리머 애자의 신뢰성 평가 및 운용기준 제정'. 한국전력 연구결과보고서, 2001
  4. N. Yoshimura, S. Kumagai, 'Electrical and Environmental Aging of Silicone rubber Used in Outdoor Insulation', IEEE Transactions on Dielectrics and Electrical Insulation, Vol.6, No.5, pp. 632-650, October 1999 https://doi.org/10.1109/94.798120
  5. R. Hackam, 'Outdoor HV Composite Polymeric Insulators', IEEE Transactions on Dielectrics and Electrical Insulation, Vol.6, No.5, pp. 557-585, October 1999 https://doi.org/10.1109/94.798114
  6. J. Kim, M.K. Chaudhury, M.J. Owen, 'Hydrophobicity Loss and Recovery of Silicone HV Insulation', IEEE Transactions on Dielectrics and Electrical Insulation, Vol.6, No.5, pp. 695-702, October 1999 https://doi.org/10.1109/94.798126
  7. V. Moreno, M. Ponce, E. Valle and J. Fierro, 'Effects of surface charge in the hydrophobicity levels of insulating materials', IEE Proceedings Generation, Transmission and Distribution, Vol. 145, No.6, pp. 675-681, November 1998 https://doi.org/10.1049/ip-gtd:19982361
  8. V. M. Moreno, R S. Gorur, 'Ac and dc Performance of Polymeric Housing Materials for HV Outdoor Insulator', IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 6, No.3, pp. 342-350, June 1999 https://doi.org/10.1109/94.775621
  9. 임경범, 이백수, 정무영, 이덕출, '열처리에 따른 Epoxy 복합재료의 표면 소수성 증가에 관한 해석', 대한전기학회논문지, 제50권, 4호, pp. 153-160, 2001
  10. D.W. Van Krevelen, 'Properties of polymers', Third Edition, KREVELEN, pp. 227-241, 1989
  11. ASTM D2303-79, Standard Test Methods for Liquid Contaminants, Incline Plane Tracking and Erosion and of Insulating Materials, American Society for Materials, Part 39, pp. 549-560
  12. IEC Publication 587, Test methods for evaluating resistance to tracking and erosion of electrical insulating materials used under severe ambient conditions, second edition, 1984
  13. ASTM D 495-89, Standard Test Methods for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation, American Society for Materials, volume 10.02, 1991
  14. H. Hillborg, U.W. Gedde, 'Hydrophobicity Changes in Silicone Rubbers', IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 6, No.3, pp. 703-717, June 1999 https://doi.org/10.1109/94.798127