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1998 Fiscal Year Final Research Report Summary

Fabrication and evaluation of conductor cables using Ag-sheathed high-Tc superconductor tapes

Research Project

Project/Area Number 08455134
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 電力工学・電気機器工学
Research InstitutionToyohashi University of Technology

Principal Investigator

OOTA Akio  Toyohashi Univ.of Tech.Professor, 工学部, 教授 (10124728)

Co-Investigator(Kenkyū-buntansha) FUKUNAGA Tetsuya  Gifu National College Lecturer, 電子制御工学科, 講師 (50249794)
Project Period (FY) 1996 – 1998
Keywordshigh-Tc super-conductors / power cable / Ag-sheathed wires / Bi2223 / AC transport loss / self fields
Research Abstract

We investigated the AC transport losses in self-fields for Ag-sheathed multifilamentary tapes that are the most promising for the strands of power transmission cables. The experimental results are explained by the theory of Norris for an elliptical superconductor with the same critical current, nearly independent of filament number or superconductor geometry. The filament twist neither causes notable influence on the e filaments, although the main contribution to the loss behavior nor equalizes the current distribution in th losses comes from the hysteresis loss.
We proposed a new method to calculate the shape of field-free core, the current distribution and. accordingly the AC transport losses in sell fields as a parameter of current amplitude 10 for straight superconductor tapes with the arbitrary sectional geometry. The AC transport losses for. rectangular tapes behave as a thin strip superconductor in high 10 values near critical current, while showing a gradual deviation from this … More behavior as 10 is lowered. A decrease in the aspect ratio of width to thickness in the rectangular tape makes the deviation more remarkable. We applied this method to calculations on the AC transport losses for two kinds of 7-filamentary tapes with different filament arrangements. We compared the results with the experimental behaviors of the losses for Ag-sheathed Bi2223 tapes, and found that the measured losses are explained by the calculated results of loss-density distribution. The influence of filament arrangement on the loss behaviors is suppressed as the filament number increases to 37, from 7.
Using this method, we made numerical calculations on the losses for models of parallel-conductors cables composed of a single- or a multi-layer configurations using rectangular superconductor tapes as the strands. The loss values of cable conductors are strongly influenced by the tape gap on a cylindrical former or a separation between the face-to-face tapes in each layer. The results suggest that the improvement of tape and cable structure, i.e., the arrangement of superconducting cores in the cable conductors, is important to suppress the losses generating in the cable conductors under AC current transmission. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Fukunaga et, al: "Field-free-core, current distribution, and alternationg ---" Applied Physics Letters. 72. 3362-3364 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 稲田亮史 他: "数値計算による高温超電導テープの交流通電損失の解析" 低温工学. 33. 766-772 (1998)

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      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano et al.: "Intragranular critical current density from history effect -" Advances in Superconductivity X (Springer). 10. 775-778 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Oota et al.: "Excellent microwave properties of screen-printed Bi2223 ---" Advances in Superconductivity X (Springer). 10. 1173-1176 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kawano et al.: "Magnetic field distributions in screen-printed Ag-Bi2223" Advances in Superconductivity X (Springer). 10. 779-782 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Fukunaga et al.: "Influence of form and arrangement of superconductor on AC --" Advances in Superconductivity X (Springer). 10. 821-824 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Fukunaga, R.Inada and A.Oota: "Field-free core, current distribution, and alternating current losses in self fields for rectangular supercondutor tapes." Applied Physics Letters. 72. 3362-3364 (1998)

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      「研究成果報告書概要(欧文)」より
  • [Publications] R.Inada, T.Fukunaga and A.Oota: "Numerical Analysis of AC transport losses of High-temperature superconducting tapes." Teion Kougaku [In Japanese]. 33. 766-772 (1998)

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      「研究成果報告書概要(欧文)」より
  • [Publications] K,Kawano, K.Fukuta and A.Oota: "Intragranular critical current density from history effect in Ag-Bi2223 tape" Advances in Superconductiviti X (Springer-Verlag) Tokyo. 775-778 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Oota, K.Fujikawa, K.Yamashita, M.Tanaka, T.Tatekawa, N.Matsui, Y.Kintaka and Y.Ishikawa: "Excellent microwave properties in screen-printed Ag- (Bi, Pb) _2Sr_2Ca_2Cu_3O_x thick films" Advances in Superconductivity X (Springer-Verlag, Tokyo). 1173-1176 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kawano, K.Fujikawa, A.Oota and H.Fujimoto: "Magnetic field distributions in screen-printed Ag-Bi2223 tapes with various shapes" Advances in Superconductivity X (Springer-Verlag, Tokyo). 779-782 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Fukunaga, R.Inada and A.Oota: "Influence of form and arrangement of superconductor on AC transport losses of high Tc superconducting wires and cables" Advances in Superconductivity X (Springer-Verlag, Tokyo). 821-824 (1998)

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      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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