• Title/Summary/Keyword: Bi-2223/Ag HTS

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A Study on Stability of Ag sheathed Bi-2229 tape and Cylindrical Stacking Conductor for HTS Cable (고온초전도 케이블용 은시스 Bi-2223 테이프 및 적층 도체의 안정성연구)

  • Lee, B.S.;Kim, Y.S.;Jang, H.M.;Back, S.M.;Kim, S.H.
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.1554-1556
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    • 2000
  • Normal zone propagation(NZP) characteristics were investigated on Ag sheathed multi filamentary Bi-2223 tape and cylindrical stacking conductor. The critical current($I_c$) of Ag sheathed Bi-2223 tape and cylindrical stacking conductor were 12 A, 63 A at 77 K, 0 T. Normal zone propagation(NZP) experiments with tape were conducted with refrigerator in temperature from 45 K to 77 K, 0 T. Cylindrical stacking conductor was molding with epoxy and experiments were conducted with adiabatic condition in $LN_2$. NZP velocities of tape with two condition of DC and AC were almost same at each temperature. Temperature ($T_1$) of tape with distance of 0.5 cm from heater was strongly climbed up to 95K and slowly decreased. NZP velocities of cylindrical stacking conductor were 1.9-2.4 cm/sec in $LN_2$.

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The Characteristics on AC Losses and Construction of Prototype High-Tc Superconducting Cable (Prototype 고온 초전도 케이블의 제작 및 교류손실)

  • 김영석;이병성;정종만;백승명;김상현
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2000.02a
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    • pp.97-100
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    • 2000
  • Superconducting power cable is one of the most promising energy application of high-Tc superconductors (HTS). Thus, we investigated previously the characteristics on electrical and mechanical Bi-2223 Ag sheathed tape. And a prototype HTS cable have been designed, constructed and tested. The result shows that the transport current of HTS cable (1, 19-filament) in LN2 was 116[A], 240[A], respectively. And AC loss of HTS cable(19-filament) was 1.7 [W/m] in 240 [A] loading.

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Fabrication and the transportation properties of 1000A class multistrand conductor for HTS power cable (고온초전도 전력케이블용 1000A급 multistrand conductor의 제조 및 특성분석)

  • Park, S.C.;Yoo, J.M.;Ko, J.W.;Kim, H.D.;Kang, S.C.;Chung, H.S.
    • Progress in Superconductivity
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    • v.3 no.1
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    • pp.115-119
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    • 2001
  • For the fabrication of HTS power cable, multifilamentary Bi-2223/Ag tapes have been prepared using the powder-in-tube (PIT) process. After final heat treatment, these tapes have $I_{c}$ value of 43A, and$ J_{c}$ value of $28,000A/\textrm{cm}^2$(77K, 0T). Prototype 1000A class multistrand conductor(length~1m) was fabricated using these tapes(length~300m). This multistrand conductor was impregnated with low-temperature epoxy. The transportation properties of prototype 1000A class multistrand conductor has been evaluated at 77K, and yielding a current capacity up to 1200A.A.A.

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A study on fabrication of Bi-2223 tape for current lead (전류 도입선용 고온 초전도 선재 제작에 관한 연구)

  • Yim, Seong-Woo;Park, Kyung-Kuk;Han, Byung-Sung;Ha, Hong-Su;Cheong, Dae-Young;Oh, Sang-Soo
    • Proceedings of the KIEE Conference
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    • 1998.11c
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    • pp.835-837
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    • 1998
  • Current lead plays the part of connector between ambient temperature and liquid helium superconducting magnet. Having zero resistance characteristic, it is expected that HTS has very low thermal conductivity and generate no joule heat when fabricated to current lead. In particular, among the HTS meterials, HTS tape has high Jc and Ag-sheath of tape plays the part of stabilizer, but it has too poor mechanical strength to be applied and when fabricated as long length tape, it has tendency to decline Jc seriously. In this study, we fabricated Bi-2223 multifilamentary tapes and then made current lead with stacking type using them. Through this work, we conclude that the defect of HTS long length tape is decreased by addition the number of stacking tape and that current lead is able to operate more stably by minimizing the gap of tapes.

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AC loss Characteristics under Critical Current Degradation of HTS Tapes (고온 초전도 tape의 임계전류 저하에 따른 교류손실 특성)

  • Kim H. J.;Cho J. W.;Kim J. H.;Sim K. D.;Kwag D. S.;Bae J. H.;Kim H. J.;Seong K. S.
    • Progress in Superconductivity and Cryogenics
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    • v.7 no.3
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    • pp.29-33
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    • 2005
  • Critical current$(I_c)$ degradation of High $T_c$ Superconducting(HTS) tapes and AC loss under mechanical load is one of the hottest issues in HTS development and application. Mechanical load reduces the critical current of superconducting wire, and the $I_c$ degradation affects the AC loss of the wire. We measured the $I_c$ degradation and AC loss under tension and bending of Bi-2223 tapes made by 'Powder-in-Tube' technique at 77K with self-field. Also, we have studied the frequency characteristics on self-field AC loss in multi-filamentary Bi-2223/Ag tape at 77K. The measurement results and discussions on the relationship between $I_c$ degradation and AC loss are presented.

Ac Loss Characteristics under Critical Current Degradation of HTS Tapes (고온 초전도체의 임계전류 저하에 따른 교류 손실 특성)

  • Kim, Hae-Joon;Kim, Jae-Ho;Sim, Ki-Deok;Cho, Jeon-Wook;Kwag, Dong-Soon;Kim, Hae-Jong;Seong, Ki-Chul
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.286-287
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    • 2005
  • Critical current(Ic) degradation of HTS tapes and AC loss under mechanical load is one of the hottest issues in HTS development and application. Mechanical load reduces the critical current of superconducting wire, and the Ie degradation affects the AC loss of the wire. We measured the Ie degradation and AC loss under tension and bending of Bi-2223 tapes processed by "Powder-in-Tube" technique at 17K with self-field. And we have studied the frequency dependence of self-field AC loss in multi-filamentary Bi-2223/Ag tape at 77K. The measurement results and discussions on the relationship between Ic degradation and AC loss are presented.

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Design and tests of prototype HTS power transmission cables

  • Ha, Hong-Su;Jo, Yeong-Sik;Oh, Sang-Su;Seong, Gi-Cheol;Kwon, Yeong-Gil;Ryu, Gang-Sik;Cho, Jeon-Uk
    • 한국초전도학회:학술대회논문집
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    • v.10
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    • pp.280-284
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    • 2000
  • The prototype high-T$_c$ superconducting (HTS) power transmission cables have been designed and fabricated multi layers of spirally wound HTS tapes. The cables were made Bi-2223 based Ag-sheathed HTS tapes, and tested in LN$_2$. Critical currents of 700A dc and better were achieved. The magnetic flux density and field direction were analyzed in the cable configuration. In this paper the results of analysis and tests of HTS power transmission cables were described.

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Analysis of HTS Current Lead with Variable Area (단면적 변화를 가지는 고온초전도체 전류도입선 해석)

  • 문성수;설승윤
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2000.02a
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    • pp.22-25
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    • 2000
  • To improve the performance of high temperature superconducting current leads, variable cross-sectional area is considered. The cross-sectional area is varied as a function of current density to fix the safety factor along lead length. New integration method is devised to find optimum cross-sectional area distribution. New design of current lead has low heat leak into cryostat and less material than constant cross-sectional area leads. Conduction cooled lead is considered. The developed method is applied to Bi2223 current leads sheathed Ag-Au alloy.

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Design of High Temperature Superconducting Magnet with Magnetic Material (자성체를 포함하는 고온초전도 마그네트의 설계)

  • Jo, Young-Sik;Kwon, Young-Kil;Kim, Young-Kyoun;Lee, Geun-Ho;Hong, Jung-Pyo;Ryu, Kang-Sik
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.50 no.8
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    • pp.367-373
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    • 2001
  • This paper presents racetrack High Temperature Superconducting (HTS) magnet with iron plates to achieve the maximum current-carrying capacity and the simple shape that can easily be wound and jointed. On the basis of the magnetic field analysis using Biot-Savart's law and 3 Dimensional Finite Element Analysis (3D FEA), this study is focused on the function of iron plates, which is to obtain smaller B${\perp}$, and stress and strain condition of Ag-sheathed Bi-2223 37-filament HTS tapes are considered. Moreover, the measured performance of the magnet with iron plates improved by 50% on the basis of initial magnet.

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