CN1044941C - Superconductive current lead - Google Patents
Superconductive current lead Download PDFInfo
- Publication number
- CN1044941C CN1044941C CN93103129A CN93103129A CN1044941C CN 1044941 C CN1044941 C CN 1044941C CN 93103129 A CN93103129 A CN 93103129A CN 93103129 A CN93103129 A CN 93103129A CN 1044941 C CN1044941 C CN 1044941C
- Authority
- CN
- China
- Prior art keywords
- current lead
- superconductive current
- superconductive
- thermal conductivity
- alloy
- 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 - Fee Related
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Classifications
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- 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
-
- 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
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- 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)
Abstract
A material representing a low thermal conductivity at a temperature lower than a room temperature is used for a basic member composing a superconductive current lead. The basic member is combined with an oxide system superconductive member. The basic member decreases the heat transfer from the superconductive current lead to an extreme low temperature side.
Description
The present invention relates to a kind of superconductive current lead, more particularly, relate to the improvement that a kind of superconductive current lead is done, the superconducting apparatus that this superconductive current lead system will be placed in special low-temperature environment is connected to the superconductive current lead of the power supply that is placed in room temperature environment etc.
Its cross section system of current feed that uses for superconducting apparatus designs to such an extent that make the heat that electric current produced of the current feed of flowing through and its summation of heat that passes to current feed from high-temperature part reach minimum degree, and the evaporation capacity that resembles the cooling agent of helium and so on also reaches minimum degree.
In the ordinary course of things, current feed is made of copper cash.In this case, the someone studied and adopts each oxide system superconducting metal line with silver coating to achieve the above object.
But the current feed that is made of silver layer oxide system superconducting metal line has the big shortcoming of heat output, this is because the thermal conductivity of silver cause higher than other metal under the special low-temperature space of superconducting apparatus operation temperature area, although this has such benefit, promptly the stability of superconducting metal wire has improved.
This current feed also has such shortcoming and since alternating current or transient current when flowing through current feed the resistance of silver layer under special low temperature, become very low, thereby the Joule heat that silver layer eddy current and couple current are produced can not be ignored.
Documents 1 discloses a kind of method with the oxide coated super conductor wire of Ag alloy.In the past, described oxide coated when making oxide superconductor as documents 1 with the Ag alloy, for stability and the conductivity of looking after electric current, consider can not increase this factor of resistance when selecting clad material as far as possible.This consideration is called as " the stabilisation design of superconductor ".Because the resistance of the clad metal of the super conductor wire of this " stabilisation design " has reduced, so pyroconductivity has just increased.
The present invention has abandoned being applicable to " stabilisation design " thought of superconductor in the past, and specially selects the low clad metal of pyroconductivity.
Therefore, the purpose of this invention is to provide a kind of superconductive current lead, the heat that passes to this superconductive current lead from outside high-temperature part reduces to some extent.
The superconductive current lead that the Joule heat that another object of the present invention provides a kind of electric current to produce reduces to some extent.
The present invention also has another purpose, and a kind of like this superconductive current lead promptly is provided, and adopts this lead-in wire can reduce the evaporation capacity of cooling agent.
Superconductive current lead of the present invention comprises:
The superconducting metal line of predetermined quantity, each superconducting metal line comprises:
First member that the oxide system superconductor constitutes; With
Be lower than second member that presents predetermined thermal conductivity material formation under the room temperature, this predetermined thermal conductivity is characterized in that less than the thermal conductivity under the room temperature second member is the Ag-Au alloy of a gold content less than 15 atom %.
The thermal conductivity that reduces a kind of material must reduce the resistance of this material, thereby eddy current loss or couple current loss reduce when making alternating current or transient current flow through superconductive current lead.
Oxide system superconductor among the present invention can be from for example 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-Cs-Cu-O, La-Sr-Cu-O, the material that La-Ba-Cu-O chooses, and can be to be selected from for example to contain main component Au or Ag and at least a element Pd being lower than the material that thermal conductivity is little under the temperature of room temperature (being equivalent to high-resistance material), Pt, Mn, Mg, the alloy of Zr or Au, contain transition metal series integration gold as the material (this main component becomes oxide in the superconductor heat treatment process) of main component with such as aluminium oxide, Mgo, the oxide system material of LaAlO and so on.
The a little materials of those of rank rear can be as the enhancing ingredients of superconductive current lead, simultaneously can oxide system lead material with than low thermal conductivity material between insert the noble metal composition the barrier layer.
When enhancing ingredients adopted the Ag-Au alloy, the content of Au should be preferably 1 to 10% less than 15% with atomic ratio measuring.
The superconducting metal wire of predetermined quantity can be one or more superconducting metal wire.
Illustrate in greater detail content of the present invention now in conjunction with the accompanying drawings.In the accompanying drawing:
Fig. 1 is the schematic diagram that superconducting apparatus is connected to the superconductive current lead of power supply;
Fig. 2 is the perspective view of the superconductive current lead of the present invention's first most preferred embodiment;
Fig. 3 is the perspective view of the superconductive current lead of the present invention's second most preferred embodiment.
As seen from Figure 1, superconductive current lead 4 is connected on superconducting coil (equipment) 3 and the current feed 5 by connector 41 and 42, power supply 6 is added to superconducting coil 3 two ends with predetermined voltage through current feed 5 and superconductive current lead 4, and wherein superconducting coil 3 and superconductive current lead 4 are immersed in the liquid helium 2 that is contained in container 1.
Fig. 2 shows the superconductive current lead 4 that most preferred embodiment of the present invention is used for equipment shown in Figure 1.Superconductive current lead 4 is made up of a plurality of strip metal lines 7, and each strip metal line 7 all is made of heart yearn 8 and the alloy cladding layer 9 that an oxide system superconductor is made.
In first example of first most preferred embodiment, heart yearn 8 is 1223 mutually the oxide system superconductors (Tl-Pb-Sr-Ba-Ca-Cu-O) that contain as the Tl of main component and Pb single-layer system, alloy cladding layer 9 is Au-5 atom %Pb alloys, wherein each superconduction bandwidth is 2.4 millimeters, thick 1.4 millimeters, 3.3 square millimeters of sectional areas.The superconductive current lead of so making 4 is immersed in the liquid helium that temperature is 77K, about 100 peaces of its superconduction critical electric current.The electric current lead-in wire 4 and 5 o'clock of flowing through estimates that according to the evaporation capacity of liquid helium 2 the heat side definite value that passes to liquid helium 2 when whenever having 1 peace electric current to flow through is about 0.05 milliwatt.From this result, can affirm that this superconductive current lead 4 has the very little characteristic of heat transfer.This is because due to alloy cladding layer 9 structures that thermal conductivity is low under employing low temperature.Thereby reduced and passed through the heat that alloy cladding layer 9 is transmitted.
When the alternating current of 60 He Zhi passed through superconductive current lead 4, after measured, when whenever having 1 peace electric current to flow through, the heat of nearly 1 milliwatt passed in the liquid helium 2.This result superconduct lead-in wire 4 certainly is very little conductors of thermal losses.This be since the resistance of alloy cladding layer 9 big due to, thereby the eddy current that has reduced conductor decreases the loss of not sum couple current.
In second example of first most preferred embodiment, the size of superconductive current lead 4 is identical with first example, but the alloy cladding layer 9 that heart yearn of being made by the oxide system superconductor (Bi-Sr-Ca-Cu-O) of Bi12212 system 8 and Ag-3 atom %Au alloy are made constitutes.
These superconductive current lead 4 its critical currents that are immersed in temperature and are in the liquid helium 2 of 4.2K are 10 peace/square centimeters, and this value that obtains when adopting fine silver with clad material is identical.The resistivity that draws simultaneously is up to 0.7 to 1.2 micro-ohm centimetre, shows and adopts fine silver to compare as the situation of clad material under very low temperature region to alter a great deal.
Relevant with the resistivity of alloy cladding layer 9, the thermal conductivity of the superconductive current lead 4 common current lead-in wire of making than phosphorus one deoxidized cooper that becomes is little.Therefore, adopt the situation of pure Ag with coating layer and compare, this superconductive current lead 4 is available, and its eddy current loss is 1%
As for the resistance of connector 42 and 41, its resistance not only descends, but also As time goes on settles out.
Listed the thermal conductivity (watt/meter K) of alloy cladding layer under different temperatures in first and second examples of most preferred embodiment in the following table.
Temperature (K) the first example second example fine silver
260 500 160 590
77 170 51 530
20 75 10 25,000
Fig. 3 shows the superconductive current lead of the present invention's second most preferred embodiment.This superconductive current lead comprises the basic building block 10 that aluminium oxide makes, thin layer 11 and the oxide system superconducting layer 12 that silver is made.The basic member 10 of aluminium oxide can replace with Ag-Au alloy basic building block.
That as above spoke face to face is such, basic building block of the present invention adopts and is being lower than the material that thermal conductivity descends under the temperature of room temperature, thereby the heat minimizing of not only passing to cooling agent by basic building block, and lead-in wire also reduces because of electric current flows through the heat that produces, thereby reduced the consumption and the load of refrigerator cooling agent.
Though for knowing that intactly disclosing content of the present invention only describes with regard to some specific embodiments, but therefore this specification appending claims is not restricted, embodied all modifications scheme and other structures that those skilled in the art that can propose and should look it, and all these should belong in the nature of things in the scope of the basic instruction that this specification proposes.
Claims (3)
1. superconductive current lead comprises:
The superconducting metal line of predetermined quantity, each superconducting metal line comprises;
First member that the oxide system superconductor constitutes; With
At second member that is lower than the material that presents predetermined thermal conductivity under the room temperature, this predetermined thermal conductivity is characterized in that less than the thermal conductivity under the room temperature:
Described second member is the Ag-Au alloy of a gold content less than 15 atom %.
2. superconductive current lead according to claim 1 is characterized in that, described second member is an Ag-Au alloy that contains 1 to 10 atom %Au.
3. superconductive current lead according to claim 1 is characterized in that:
Each described superconducting metal wire is a strip metal silk, and wherein said second member coats described first member, and described second member is an Ag-Au alloy that contains 1 to 10 atom %.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP244966/92 | 1992-09-14 | ||
| JP4244966A JPH05198434A (en) | 1991-10-14 | 1992-09-14 | Superconductive current lead |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1084313A CN1084313A (en) | 1994-03-23 |
| CN1044941C true CN1044941C (en) | 1999-09-01 |
Family
ID=17126607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93103129A Expired - Fee Related CN1044941C (en) | 1992-09-14 | 1993-03-15 | Superconductive current lead |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0588461B1 (en) |
| KR (1) | KR100275091B1 (en) |
| CN (1) | CN1044941C (en) |
| CA (1) | CA2091595A1 (en) |
| DE (1) | DE69310649T2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000150973A (en) * | 1998-11-16 | 2000-05-30 | Mitsubishi Cable Ind Ltd | Superconducting system |
| CN100416879C (en) * | 2005-08-11 | 2008-09-03 | 中国科学院高能物理研究所 | Positive-negative integral current lead structure and method of screw section |
| KR100732063B1 (en) * | 2005-12-14 | 2007-06-27 | 한국기초과학지원연구원 | Link structure of current lead and super conduct bus line |
| CN100475403C (en) * | 2005-12-15 | 2009-04-08 | 中国科学院电工研究所 | Superconductive current lead welding method |
| JP5697162B2 (en) * | 2011-11-14 | 2015-04-08 | 学校法人中部大学 | Current lead |
| CN109273190B (en) * | 2018-11-30 | 2020-07-17 | 西北有色金属研究院 | High-temperature superconducting coil excitation device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0428993A2 (en) * | 1989-11-14 | 1991-05-29 | Sumitomo Electric Industries, Ltd. | Use of an oxide superconducting conductor |
| JPH04155715A (en) * | 1990-10-18 | 1992-05-28 | Furukawa Electric Co Ltd:The | Manufacture of ceramic superconductor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3731266A1 (en) * | 1987-09-17 | 1989-04-06 | Kernforschungsz Karlsruhe | COVER MATERIAL FOR SUPRAL-CONDUCTING WIRE |
| JPH0353415A (en) * | 1989-07-19 | 1991-03-07 | Sumitomo Electric Ind Ltd | Superconductor wire rod |
| JPH0758602B2 (en) * | 1990-03-27 | 1995-06-21 | 工業技術院長 | Superconducting tape manufacturing method |
-
1993
- 1993-03-10 DE DE69310649T patent/DE69310649T2/en not_active Expired - Fee Related
- 1993-03-10 EP EP93301815A patent/EP0588461B1/en not_active Expired - Lifetime
- 1993-03-12 KR KR1019930003741A patent/KR100275091B1/en not_active IP Right Cessation
- 1993-03-12 CA CA002091595A patent/CA2091595A1/en not_active Abandoned
- 1993-03-15 CN CN93103129A patent/CN1044941C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0428993A2 (en) * | 1989-11-14 | 1991-05-29 | Sumitomo Electric Industries, Ltd. | Use of an oxide superconducting conductor |
| JPH04155715A (en) * | 1990-10-18 | 1992-05-28 | Furukawa Electric Co Ltd:The | Manufacture of ceramic superconductor |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0588461A1 (en) | 1994-03-23 |
| KR100275091B1 (en) | 2000-12-15 |
| EP0588461B1 (en) | 1997-05-14 |
| DE69310649T2 (en) | 1997-09-04 |
| CA2091595A1 (en) | 1994-03-15 |
| CN1084313A (en) | 1994-03-23 |
| KR940007902A (en) | 1994-04-28 |
| DE69310649D1 (en) | 1997-06-19 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |