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EP0588461B1 - Amenée de courant supra-conductrice - Google Patents

Amenée de courant supra-conductrice Download PDF

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Publication number
EP0588461B1
EP0588461B1 EP93301815A EP93301815A EP0588461B1 EP 0588461 B1 EP0588461 B1 EP 0588461B1 EP 93301815 A EP93301815 A EP 93301815A EP 93301815 A EP93301815 A EP 93301815A EP 0588461 B1 EP0588461 B1 EP 0588461B1
Authority
EP
European Patent Office
Prior art keywords
superconductive
current lead
alloy
wires
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93301815A
Other languages
German (de)
English (en)
Other versions
EP0588461A1 (fr
Inventor
Takaaki Sasaoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP4244966A external-priority patent/JPH05198434A/ja
Application filed by Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Publication of EP0588461A1 publication Critical patent/EP0588461A1/fr
Application granted granted Critical
Publication of EP0588461B1 publication Critical patent/EP0588461B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/68—Connections to or between superconductive connectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines

Definitions

  • This invention relates to a superconductive current lead, and more particularly to a superconductive current lead for connecting a superconductive machine placed in an atmosphere at an extreme low temperature to a power supply, etc. placed in an atmosphere at room temperature.
  • a current lead which is used for a superconductive machine is designed to have a cross-section, such that the sum of heat generated by the current flow through the current lead and heat transferred from a high temperature portion to the current lead becomes minimum, and an evaporation amount of coolant such as helium, etc. becomes also minimum.
  • a current lead is composed of copper wires. Under this circumstance, a current lead using oxide system superconductive wires each covered with an Ag layer has been studied for the same purpose.
  • a current lead composed of an Ag-layered oxide system superconductive wires has the disadvantage in that the amount of heat transferred is large, because the thermal conductivity of Ag is large, at an extreme low temperature region, which is an operating region of a superconductive machine, as compared to other metals, although this results in an advantage in that the stability of the superconductive wires is increased.
  • JP-A-4155715 and US-A-5975285 disclose a superconductive current lead comprising one or more superconductive wires, the or each wire including a first member of an oxide system superconductive material and a second member of an Ag-Au alloy.
  • a lead is characterised in that the alloy is an Ag-Au alloy including Au of less than 15 atomic %, the alloy having a thermal conductivity at a temperature lower than room temperature which is lower than its thermal conductivity at room temperature.
  • lowering the thermal conductivity is associated with raising the electric resistance, so that a decrease in eddy current loss or coupling current loss is realized, when AC current or transient current flows through the superconductive current lead.
  • an oxide system superconductive material may be a material selected from, for instance, Y-Ba-Cu-O, Bi-Sr-Cu-O, Bi-Pb-Sr-Ca-Cu-O, Tl-Ba-Cu-O, Tl-Ba-Ca-Cu-O, Tl-Sr-Ca-Cu-O, La-Sr-Cu-O, La-Ba-Cu-O.
  • a barrier layer of precious metal may be interposed between the oxide system superconductive material and the lower thermal conductivity alloy.
  • the content of Au in the alloy is preferably 1 to 10%, by atomic ratio.
  • a predetermined number of superconductive wires may be one or more superconductive wires.
  • Fig. 1 shows a superconductive current lead 4 connected to a superconductive coil (machine) 3 and a current lead 5 by connectors 41 and 42, and a power supply 6 provided to apply a predetermined voltage across the superconductive coil 3 via the current lead 5 and the superconductive current lead 4, wherein the superconductive coil and current lead 3 and 4 are immersed in liquid helium 2 contained in a container 1.
  • Fig.2 shows a superconductive current lead 4 of a preferred embodiment according to the invention which is used in the apparatus as shown in Fig.1.
  • the superconductive current lead 4 comprises a plurality of tape-shaped wires 7 each comprising a core 8 of an oxide system superconductive material and an alloy covering layer 9.
  • the core 8 is of an oxide system superconductive material (Bi-Sr-Ca-Cu-O) Bi-2212 system as a main component
  • the alloy covering layer 9 is of Ag-3 atomic % Au alloy, wherein each superconducting tape is 2.4 mm in width, 1.4 mm in thickness, and 3.3 mm 2 in cross-sectional area.
  • a critical current of this superconductive current lead 4 immersed in the liquid helium 2 at a temperature of 4.2K is 10 5 A/cm 2 which is the same value as a value obtained in case where pure Ag is used for a covering material.
  • a resistivity which is as high as 0.7 to 1.2 ⁇ ⁇ ⁇ cm is obtained to represent a significant change as compared to the case where pure Ag is used at an extreme low temperature region for a covering material.
  • a thermal conductivity of the superconductive current lead 4 is smaller than that of common current lead of phosphorus-deoxidized copper. Consequently, the superconductive current lead 4 can be used with an eddy current loss of one percent as compared to that in the case where pure Ag is used for a covering layer.
  • the resistance value is not only decreased, but also stabilized upon the elapse of time.
  • the thermal conductivity (W/m ⁇ k) of the alloy covering layer 9 is shown below in a table relative to a temperature along with that of a pure Ag covering layer.
  • Fig. 3 shows a superconductive current lead of a second preferred embodiment according to the invention.
  • the superconductive current lead comprises a basic member 10 of Ag-Au alloy, a thin layer 11 of Ag and an oxide system superconductive layer 12.
  • a material representing a lower thermal conductivity at a temperature lower than a room temperature is used for a basic member in the invention, so that a heat transferring through the basic member to coolant is not only decreased, but a heat of the lead generated by the flow of current is also decreased, thereby decreasing the consumption of the coolant and a load of a refrigerator.
  • a plurality of leads shown in Fig. 3 can be stacked in a similar way to the wires shown in Fig. 2.

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Claims (5)

  1. Conducteur de courant supraconducteur comprenant un fil ou plusieurs fils supraconducteurs (7), le fil ou chaque fil comprenant un premier élément (8) d'un matériau supraconducteur du système d'oxyde et un second élément d'un alliage d'Ag-Au caractérisé en ce que l'alliage est un alliage Ag-Au comprenant moins de 15 % d'atomes d'Au, l'alliage ayant une conductivité thermique à une température inférieure à la température ambiante qui est inférieure à sa conductivité thermique à la température ambiante.
  2. Conducteur de courant supraconducteur selon la revendication 1, dans lequel le premier élément est couvert avec le second élément pour fournir le fil supraconducteur ; et le nombre prédéterminé de fils supraconducteurs sont empilés.
  3. Conducteur de courant supraconducteur selon la revendication 1, dans lequel le premier élément est déposé en couche sur une surface du second élément pour fournir le fil supraconducteur ; et le nombre prédéterminé de fils supraconducteurs sont empilés.
  4. Conducteur de courant supraconducteur selon l'une quelconque des revendications précédentes, dans lequel le fil supraconducteur est un fil en forme de bande.
  5. Conducteur de courant supraconducteur selon l'une quelconque des revendications précédentes, dans lequel l'alliage comprend 1 à 10 % d'atomes d'Au.
EP93301815A 1992-09-14 1993-03-10 Amenée de courant supra-conductrice Expired - Lifetime EP0588461B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4244966A JPH05198434A (ja) 1991-10-14 1992-09-14 超電導電流リード
JP244966/92 1992-09-14

Publications (2)

Publication Number Publication Date
EP0588461A1 EP0588461A1 (fr) 1994-03-23
EP0588461B1 true EP0588461B1 (fr) 1997-05-14

Family

ID=17126607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93301815A Expired - Lifetime EP0588461B1 (fr) 1992-09-14 1993-03-10 Amenée de courant supra-conductrice

Country Status (5)

Country Link
EP (1) EP0588461B1 (fr)
KR (1) KR100275091B1 (fr)
CN (1) CN1044941C (fr)
CA (1) CA2091595A1 (fr)
DE (1) DE69310649T2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1276679B1 (it) * 1995-06-08 1997-11-03 Pirelli Cavi S P A Ora Pirelli Procedimento per la produzione di un nastro superconduttore multifilamentare ed elemento conduttore elettrico comprendente
JP2000150973A (ja) * 1998-11-16 2000-05-30 Mitsubishi Cable Ind Ltd 超電導システム
CN100416879C (zh) * 2005-08-11 2008-09-03 中国科学院高能物理研究所 一种螺旋形截面的正负一体电流引线结构及其制造方法
KR100732063B1 (ko) * 2005-12-14 2007-06-27 한국기초과학지원연구원 전류인입선과 초전도버스라인의 연결구조
CN100475403C (zh) * 2005-12-15 2009-04-08 中国科学院电工研究所 一种超导电流引线焊接方法
JP5697162B2 (ja) * 2011-11-14 2015-04-08 学校法人中部大学 電流リード
CN109273190B (zh) * 2018-11-30 2020-07-17 西北有色金属研究院 一种高温超导线圈励磁装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3731266A1 (de) * 1987-09-17 1989-04-06 Kernforschungsz Karlsruhe Huellmaterial fuer supraleitende draehte
JPH0353415A (ja) * 1989-07-19 1991-03-07 Sumitomo Electric Ind Ltd 超電導線材
JP2929622B2 (ja) * 1989-11-14 1999-08-03 住友電気工業株式会社 酸化物超電導導体の使用方法
JPH0758602B2 (ja) * 1990-03-27 1995-06-21 工業技術院長 超伝導テープの製造方法
JPH04155715A (ja) * 1990-10-18 1992-05-28 Furukawa Electric Co Ltd:The セラミックス超電導々体の製造方法

Also Published As

Publication number Publication date
CN1044941C (zh) 1999-09-01
DE69310649T2 (de) 1997-09-04
KR100275091B1 (ko) 2000-12-15
CA2091595A1 (fr) 1994-03-15
EP0588461A1 (fr) 1994-03-23
DE69310649D1 (de) 1997-06-19
CN1084313A (zh) 1994-03-23
KR940007902A (ko) 1994-04-28

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