Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Electrical characteristics of insulating materials for HTS bushing immersed in $LN_2$

  • Choi, J.H. (Department of Electrical Engineering, Gyeongsang National University and Engineering Research Institute) ;
  • Kim, W.J. (Department of Electrical Engineering, Gyeongsang National University and Engineering Research Institute) ;
  • Shin, H.S. (Department of Mechanical Design Engineering, Andong National University) ;
  • Kim, S.H. (Department of Electrical Engineering, Gyeongsang National University and Engineering Research Institute)
  • Received : 2011.10.24
  • Accepted : 2011.11.21
  • Published : 2011.11.30
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Abstract

For the operation of high temperature superconducting (HTS) power equipments, it is necessary to develop insulating materials and high voltage (HV) insulation technology at cryogenic temperature of bushing. In this paper, the surface flashover characteristics of various insulating materials in $LN_2$ are studied. These results are studied at both AC and impulse voltage under a non-uniform field. The negative impulse breakdown voltage of GFRP is slightly higher than the positive impulse breakdown voltage. The use of glass fiber reinforced plastic (GFRP) and polytetrafluoroethylene (PTFE, Teflon) as insulation body for HTS bushing should be much desirable. Especially, GFRP is excellent material not only surface flashover characteristics but also mechanical characteristics at cryogenic temperature. The surface flashover is most serious problem for the shed design in $LN_2$ and operation of superconducting equipment.

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References

  1. T. Yamagiwa, Y. Kamata, Y. Yoshika and M. Hosokawa, "Dielectric Characteristics of Gas Insulated Bushings in Air Under Dry and Wet Conditions", IEEE Trans. on Power Appar. and Systems, vol. PAS-100, pp. 2746-2751, 1981. https://doi.org/10.1109/TPAS.1981.316387
  2. F. Colla, M. Pompili, C. Mazzetti and R. Bartnikas, "Partial Discharge Behavior of Oil Impregnated Paper Bushings", Conference Record of the 1998 IEEE International Symposium on Electrical Insulation, pp.35-38, Arlington, Virginia(USA), June 7-10, 1998.
  3. J.L. Douglas and A.W. Stannett, "Laboratory and Field Tests on 132kV Synthetic-Resin Bonded-Paper Condenser Bushings", Proceedings I.E.E., Paper, no. 2473S, pp. 278-287, January 1958.
  4. J. W. Choi, H. G. Cheon, J. H. Choi, H. J. Kim, J. W. Cho and S. H. Kim, "A study on insulation characteristics of laminated polypropylene paper for an HTS cable", IEEE Trans. on Appl. Supercond., vol.20, pp.1280-1283, 2010. https://doi.org/10.1109/TASC.2010.2044235
  5. J. H. Choi, J. W. Choi, S. M. Baek and S. H. Kim, "The insulation design of 154kV HTS transformer and on load tap changer", IEEE Trans. on Appl. Supercond., vol.19, pp. 1972-1975, 2009. https://doi.org/10.1109/TASC.2009.2017755
  6. D. S. Kwag, H. G. Cheon, J. H. Choi, H. J. Kim, J. W. Cho and S. H. Kim, "Electrical insulation characteristics of a high-Tc superconducting DC cable", IEEE Trans. on Appl. Supercond., vol. 18, pp. 1402-1405, June, 2008. https://doi.org/10.1109/TASC.2008.920833
  7. J. Brandrup, E. H. Immergut, E. A. Grulke, Polymer Handbook(4 ed.), Wiley-Interscience, 1999.