KIEE International Transactions on Electrophysics and Applications

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Electrical Insulation Characteristics at Cryogenic Temperature for High Temperature Superconducting Cables

  • Okubo, Hitoshi (Center for Integrated Research in Science and Engineering, Nagoya University) ;
  • Hayakawa, Naoki (Dept. of Electrical Engineering, Nagoya University)
  • Published : 2004.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper discusses electrical insulation characteristics at cryogenic temperature, especially focusing on partial discharge (PD) inception characteristics, for high temperature superconducting cables. In liquid nitrogen (L$N_2$) / polypropylene (PP) laminated paper composite insulation system, PD inception strength (PDIE) was evaluated in terms of volume effect and V-t characteristics. Different kinds of butt gap condition were applied in the experiments, using parallel plane and coaxial cylindrical cable samples. Experimental results revealed that the volume effect on PDIE could be evaluated by the statistical stressed liquid volume (SSLV) taking account the discharge probability not only in the butt gap but also in the other thin layers between PP laminated papers. Furthermore, the indices n of V-t characteristics at PD inception were estimated to be 80∼110, irrespective of the butt gap condition.

Keywords

References

  1. T.Masuda, T.Kato, H.Yumura, M.Watanabe, Y.Ashibe, K.Ohkura, C.Suzawa, M.Hirose, S.Isojima, K.Matsuo, S.Honjo, T.Mimura, T.Kuramochi, Y.Takahashi, H.Suzuki, T.Okamoto: 'Verification tests of a 66kV HTSC cable system for practical use (first cooling tests)', Physica C Vo1.378-381, No.2, pp.1174-1180, 2002
  2. P.Caracino, M.Lakner, H.Okubo, O.Tnnesen, B.Wacker: 'SUPERCONDUCTING AND INSULATING MATERIALS FOR HTS POWER APPLICATIONS', CIGRE 15-405, 2002.
  3. D.Willen, F.Hansen, M.Daurnling, C.N.Rasmussen, J.$\phi$stergaard, C.Tnelholt, E.Veje, O.T$\phi$nnesen, K.H. Jensen, S.K.Olsen, C.Rasmussen, E.Hansen, O. Schuppach, T.Visler, S.Kvoming, J.Schuzster, J. Mortensen, J.Christiansen, S.D.Mikkelsen: 'First operation experiences from a 30 kV, 104MVA HTS power cable installed in a utility substation', Physica C, Vol.372-376, No.3, pp.1571-1579, 2002
  4. M.Hazeyama, T.Kobayashi, N.Hayakawa, S.Honjo, T.Masuda, H.Okubo: 'Partial Discharge Inception Characteristics under Butt Gap Condition in Liquid NitrogenIPPLP${\circledR}$ Composite Insulation System for High Temperature Superconducting Cable', IEEE Transactions on Dielectrics and Electrical Insulation, Vol.9, No.6, pp.939-944, 2002
  5. H.Okubo, M.Hazeyama, N.Hayakawa, S.Honjo, T Masuda: 'V-t Characteristics at Partial Discharge Inception in Liquid NitrogenlPPLP${\circledR}$ Composite Insulation System for HTS Cable', IEEE Trans. on Dielectrics and Electrical Insulation, VoI.9, No.6, pp.945-951,2002
  6. S.Mukoyama, M.Yagi, S.Tanaka, K.Matsuo, S.Honjo, T.Mirnura, TAiba, Y.Takahashi: 'Development of important elementary technologies for a 66kV-class three-phase HTS power cable', Physica C, Vol.378-381, No.2, pp.1181-1184, 2002
  7. G.M.Hathaway, A.E.Davies, S.G.Swingler: 'Dielectric Considerations for a Superconducting Cable Termination', ISH, Vol.4, No.467, pp.84-87, 1999
  8. A.Bulinski, J.Densley, TS.Sudarshan: 'The Ageing of Electrical Insulation at Cryogenic Temperature', IEEE Trans. on Electrical Insulation, Vol.15, No.2, pp.83-88, 1980