Carbonization Characteristics of Phenolic Resin Deteriorated by Tracking

트래킹에 의해 열화된 페놀수지의 탄화 특성

  • 송길목 (ESRI(전기안전연구원) 재해연구팀) ;
  • 최충석 (ESRI(전기안전연구원) 재해연구팀) ;
  • 노영수 (숭실대 공대 전기공학과) ;
  • 곽희로 (숭실대 공대 전기공학과)
  • Published : 2004.01.01

Abstract

This paper describes the carbonization characteristics of a phenolic resin deteriorated by tracking under the environment of a fire. In the experiment, a liquids droplet of 1[%] NaCl was dripped on the phenolic resin to cause a tracking with 110[V], 220[V] voltages applied. It can be addressed from the experimental results that when an insulator is carbonized by an external fire, its structure is amorphous. If an insulator is carbonized by electrical cause, on the other hand, its structure would be crystalline. In order to observe the surface change of the phenolic resin, the tracking process was analyzed by using SEM. In the case that the materials are carbonized under heat or fire, the exothermic peak appears around 500[$^{\circ}C$]. This is one of the important factors to determine the cause of fires. As a result of DTA, the exothermic peaks of an untreated sample showed at 333.4[$^{\circ}C$], 495.7[$^{\circ}C$] but those of a sample deteriorated by tracking appeared at 430.6[$^{\circ}C$], 457.6[$^{\circ}C$] in a voltage of 110[V], and at 456.2[$^{\circ}C$], 619.7[$^{\circ}C$] in a voltage of 220[V]. It is possible, therefore, to distinguish a virgin sample from carbonized samples(graphite) by the exothermic peak.

Keywords

Carbonization;Phenolic resin;Tracking;Amorphous;Crystalline

References

  1. J.M. Ripalda 외 5, 'Resonant inelastic x-ray scattering in amorphous carbon nitride'
  2. IEC Publication 112, 'Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions', IEC third edition, 1979
  3. S. Kumagai, N. Yoshimura, 'Impact of Thermal Aging and Water Absorption on the Surface Electrical and Chemical Properties of Cycloaliphatic Epoxy Resin', IEEE Trans. DEI Vol. 7, No. 3, pp.424-431, 2000 https://doi.org/10.1109/94.848931
  4. S. Kumagai, N. Yoshimura, 'Tracking and Erosion of HTV Silicone Rubbers of Different Thickness', IEEE Trans. DEI Vol. 8, No.4, pp.673-678, 2001 https://doi.org/10.1109/94.946722
  5. W. Diesendorf Dr. Tech. Sc, 'Insulation Co-ordination in High-voltage Electric Power Systems', Butterworth & Co. Ltd., pp.27-46, 1974
  6. 本問宏也 外 2, '疲形歪みに基づく高分子絶緣材料の表面漏れ電流分離計側ァルゴリズムの提案', T. IEE Japan, Vol. 122-A, No. 7, pp.702-709, '02
  7. L.L. Alston, 'High-voltage Technology', Oxford University press, pp.17-59, pp.158-195
  8. L. Warren, 'Testing for Tracking', University of Manchester Institute of Science and Technology, pp3/1-3/13, 1990
  9. 한국전기연구소, '전기재료편람', 데이컴인터내셔널, 1990
  10. Won-Chun Oh, 'Historical Background on the Electrical Properties of Carbon materials', Carbon science V3, N2, pp.99-107, 2002.6
  11. 熊谷誠治, 王新生, 吉村昇, '紫外線が屋外用高分子絶緣材料の耐トラシキング性に及ぽす影響', T. IEE Japna, Vol. 117-A, No. 3, pp.289-298, '97
  12. Chung-Seog Choi, Kil-Mok Shong, Hyung-Rae Kim, Hyang-Kon Kim, Dong-Oak Kim, Dong-Woo Kim, 'A Study on the Flame Pattern and Electrical Properties of Electric Outlet Fired at Standby Mode', KIFSE Trans. Vol. 16, No. 1, pp.39-44, 2002
  13. T. Kamosawa, Y. Inui, Y. Mizuta, N. Yoshimura, M. nishida, F. Noto, 'Investigation on Tracking Deterioration Using Electron Spin Resonance', 3rd ICPADM, pp.305-308, 1991 https://doi.org/10.1109/ICPADM.1991.172058
  14. H. Zang, R. Hackam, 'Electrical Surface Resistance, Hydrophobicity and Diffusion Phenomena in PVC, IEEE Trans. DEI, Vol. 6, No. 1, pp.73-83, 1999 https://doi.org/10.1109/94.752013
  15. Kil-Mok Shang, Chung-Seog Choi, Hyung-Rae Kim, Dong-Woo Kim, Hee-Ro Kwak, 'A Study on the Electric Fire Analysis of Insulating Materials Due to the Tracking Deterioration', 2002 ACED & K-J Symposium, pp.606-609, 2002
  16. 송길목, 최충석, 곽희로 '강제열화된 몰드변압기의 열특성 해석', 2001년 대한전기학회 춘계학술대회, pp.124-126, 2001
  17. IEC( third edition) Method for determining the comparative and the proof tracking indices of solid insulatingmaterials under moist conditions IEC Publication 112