CA2091595A1 - Superconductive current lead - Google Patents
Superconductive current leadInfo
- Publication number
- CA2091595A1 CA2091595A1 CA002091595A CA2091595A CA2091595A1 CA 2091595 A1 CA2091595 A1 CA 2091595A1 CA 002091595 A CA002091595 A CA 002091595A CA 2091595 A CA2091595 A CA 2091595A CA 2091595 A1 CA2091595 A1 CA 2091595A1
- Authority
- CA
- Canada
- Prior art keywords
- superconductive
- current lead
- current
- thermal conductivity
- wires
- 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.)
- Abandoned
Links
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
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)
Abstract
ABSTRACT OF THE DISCLOSURE
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.
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
2091~95 FIE~D OF THE INVENTION
; This invention relates to a superconductive current lead, and more particularly to, the improvement of a superconductive current lead connecting a superconductive machine placed in an atmosphere of an ; extreme low temperature to a power supply, etc. placed in an atmosphere of a room temperature.
BACKGROUND OF THE INVENTION
- A current lead which is used for a superconductive machine is designed to have a cross-section, such that the sum of a heat generated by the current flow through the current lead and a 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.
In conventional cases, a current lead is .;
composed of copper wires. Under this circumstance, i a current lead using oxide system superconductive wires -~-` each covered with Ag layer has been studied for the .....
i; same purpose.
i According to a current lead composed of the Ag-layered oxide system superconductive wires, however, there is a disadvantage in that a heat transfer amount - is large, because the thermal conductivity of Ag is :, 1 large at an extreme low temperature region which is an operation temperature 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.
In this current lead, there is a further `disadvantage in that Joule heat generated by eddy current and coupling current of the Ag layers is not negligible, because an electric resistance of the Ag ~`10 layers becomes very small at an extreme low ~`
temperature, when AC current or transient current flows ` through the current lead.
: ~, SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to ;1 ~j provide a superconductive current lead, in which a heat : i ~ -'!,, amount transferred from an external high temperature .. .;
`;~ portion thereto is decreased.
It is a further object of the invention to !20 provide a superconductive current lead, in which ~oule heat generated by the flow of current is decreased.
It is a still further object of the invention to . .
~ provide a superconductive current lead, by use of which ::............................................. .
an evaporation amount of coolant is decreased.
According to the invention, a superconductive -~ current lead, comprises :
. .~
j A predetermined number of superconductive wires , -., j ~", , ''' -: . - - , , .
2 ~ 9 ~
: each of the superconductive wires, comprising :
a first member of an oxide system : superconductive material ; and a second member of a material representing a predetermind thermal conductivity at a temperature lower than a room temperature, the predetermined thermal conductivity being lower than a thermal conductivity at the room temperature.
In a material, lowering a thermal conductivity i6 tend to lowering an electric resistance, so that the decrease of eddy current loss or coupling current loss is realized, when AC current or transient current flows through the superconductive current lead.
~ ~ 15 In the invention, an oxide system :~i 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, and a material having a lower thermal conductivity at a lower temperature than a room temperature (equivalent to having a larger electric resistance) may be a material selected from, for ` example, an alloy including Au or Ag as a main component and at least one element of Pd, Pt, Mn, Mg, . 25 Zr, and Au, a material including a transition metal system alloy as a main component which will be oxide at a thermal treatment of a superconductive material, and ., - . .. ~ . ~ ~ . . . . . . . . ... .
., .
2 ~
1 an oxide system material such as alumina, MgO, ~aAl03 . These latter materials may be used for a reinforcing member in a superconductive current lead, while a barrier layer of precious metal may be interposed between the oxide system superconductive material and the lower thermal conductivity material.
When Ag-Au alloy is used for a reinforcing member, a content of Au is less than 15~, perferably to 10%, by atomic ratio.
A predetermined number of superconductive wires may ~e one or more superconductive wires.
BRIEF DESCRIPTION OF THE DR~WINGS
The invention will be explained in more detail in conjunction with appended drawings, wherein :
Fig.1 is an explanatory diagram showing a superconductive current lead connecting a superconductive machine to a power supply ;
Fig.2 is a perspective view showing a superconductive current lead of a first preferred embodiment according to the invention ; and `:
i Fig.3 is a perspective view showing a - superconductive current lead of a second preferred i embodiment according to the invention.
` DESCRIPTION OF THE PREFERRED EMBODIMENT
`' Fig. 1 shows a superconductive current lead 4 , 209~595 l 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.
In the first example of the first preferred embodiment, the core 8 is of an oxide system superconductive material(Tl-Pb-Sr-Ba-Ca-Cu-O) including 1223 phase of Tl and Pb single layer system as a main ~:- component, and the alloy covering layer 9 is of Au-5 atomic ~ Pb alloy, wherein each superconducting tape is 2.4 mm in width, 1.4 mm in thickness, and 3.3 mm2 in ,.
:~:. cross-sectional area. The superconductive current :
~ lead 4 thus fabricated is immersed in the liquid helium ~ , 2 having a temperature of 77k, wherein a superconductive critical current of approximately lOOA
is obtained. When current flows through the leads 4 and 5, it is determined that a heat transferred to the 6 20915~
1 liquid helium 2 is approximately 0.05 mW per a current of lA in accordance with the estimation of an evaporation amount of the liquid helium 2. In accordance with the result, it is confirmed that this 5 superconductive current lead 4 has a property having a very small heat transfer. This is resulted from the structure that the alloy covering layer 9 having a low thermal conductivity at a iow temperature is used, so -~ that a heat transferred through the alloy covering 10 layer 9 is decreased.
In case where AC current of 60 Hz flows through the superconductive current lead 4, it is measured that :
a heat of approximately lmN per a current of lA is transferred to the liquid helium 2. This result ~ .1 '~ 15 confirms that the superconductive current lead 4 is a conductor having a property of a very small thermal Y loss. This is resulted from the structure that the .i alloy covering layer 9 has a large electric resistance, -~ so that eddy current loss and coupling current loss of 2Q the conductor are decreased.
~; In the second example of the first preferred embodiment, a superconductive current lead 4 having the same size as that in the first example is fabricated to include a core 8 of an oxide system superconductive 25 material (Bi-Sr-Ca-Cu-O) of Bil2212 system and an alloy covering layer 9 of Ag-3 atomic ~ Au alloy.
A critical current of this superconductive :
7 2~9~59~
1 current lead 4 immersed in the liquid helium 2 at a temperature of 4.2K is 10~ A/cmZ which is the same value as a value obtained in case where pure Ag is used for a covering material. At the same time, a resistivity which is as high as 0.7 to 1.2 ~ Q 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.
In relation to the resistivity of the alloy covering layer 9, a thermal conductivity of the .i `~superconductive current lead 4 become 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 ~,15 compared to that in the case where pure Ag is used for ,,.~
~a covering layer.
'In regard to electric resistance of the ~lconnectors 42 and 41, the resistance value is not only ,~
`~decreased, but also stabilized in the elapse of time.
,~
; 20 In the first and second examples of the `~
,~ preferred embodiment, the thermal conductivity (W/m k) of the alloy covering layer 9 is shown in a below table ' relative to a temperature along with that of a pure Ag covering layer.
.
:
.
1TEMPERATURE FIRST SECOND PURE Ag ; (k) EXAMPLE EXAMPLE
_ _ _ ~ ~
`` 20 75 1 10 25,000 : .
'-"` 10 r,~' ' ~,`~;' ~.,.
~-~ Fig. 3 shows a superconductive current lead of a i~, second preferred embodiment according to the invention.
`` 15 The superconductive current lead comprises a basic -.~
member 10 of alumina, a thin layer 11 of Ag and an . oxide system superconductive layer 12. The alumina `~ basic member 10 may be replaced by an Ag-Au alloy basic member.
20AS described above, 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 ~`~ 25 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.
,":
~'' ' , .
1 Although the invention has been described with respect to specific embodiment for complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modification and alternative constructions that may occur to one skilled in the art which fairly fall within the basic teaching herein set forth.
~ 10 "
`'`'', ,, :, .
~':
; This invention relates to a superconductive current lead, and more particularly to, the improvement of a superconductive current lead connecting a superconductive machine placed in an atmosphere of an ; extreme low temperature to a power supply, etc. placed in an atmosphere of a room temperature.
BACKGROUND OF THE INVENTION
- A current lead which is used for a superconductive machine is designed to have a cross-section, such that the sum of a heat generated by the current flow through the current lead and a 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.
In conventional cases, a current lead is .;
composed of copper wires. Under this circumstance, i a current lead using oxide system superconductive wires -~-` each covered with Ag layer has been studied for the .....
i; same purpose.
i According to a current lead composed of the Ag-layered oxide system superconductive wires, however, there is a disadvantage in that a heat transfer amount - is large, because the thermal conductivity of Ag is :, 1 large at an extreme low temperature region which is an operation temperature 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.
In this current lead, there is a further `disadvantage in that Joule heat generated by eddy current and coupling current of the Ag layers is not negligible, because an electric resistance of the Ag ~`10 layers becomes very small at an extreme low ~`
temperature, when AC current or transient current flows ` through the current lead.
: ~, SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to ;1 ~j provide a superconductive current lead, in which a heat : i ~ -'!,, amount transferred from an external high temperature .. .;
`;~ portion thereto is decreased.
It is a further object of the invention to !20 provide a superconductive current lead, in which ~oule heat generated by the flow of current is decreased.
It is a still further object of the invention to . .
~ provide a superconductive current lead, by use of which ::............................................. .
an evaporation amount of coolant is decreased.
According to the invention, a superconductive -~ current lead, comprises :
. .~
j A predetermined number of superconductive wires , -., j ~", , ''' -: . - - , , .
2 ~ 9 ~
: each of the superconductive wires, comprising :
a first member of an oxide system : superconductive material ; and a second member of a material representing a predetermind thermal conductivity at a temperature lower than a room temperature, the predetermined thermal conductivity being lower than a thermal conductivity at the room temperature.
In a material, lowering a thermal conductivity i6 tend to lowering an electric resistance, so that the decrease of eddy current loss or coupling current loss is realized, when AC current or transient current flows through the superconductive current lead.
~ ~ 15 In the invention, an oxide system :~i 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, and a material having a lower thermal conductivity at a lower temperature than a room temperature (equivalent to having a larger electric resistance) may be a material selected from, for ` example, an alloy including Au or Ag as a main component and at least one element of Pd, Pt, Mn, Mg, . 25 Zr, and Au, a material including a transition metal system alloy as a main component which will be oxide at a thermal treatment of a superconductive material, and ., - . .. ~ . ~ ~ . . . . . . . . ... .
., .
2 ~
1 an oxide system material such as alumina, MgO, ~aAl03 . These latter materials may be used for a reinforcing member in a superconductive current lead, while a barrier layer of precious metal may be interposed between the oxide system superconductive material and the lower thermal conductivity material.
When Ag-Au alloy is used for a reinforcing member, a content of Au is less than 15~, perferably to 10%, by atomic ratio.
A predetermined number of superconductive wires may ~e one or more superconductive wires.
BRIEF DESCRIPTION OF THE DR~WINGS
The invention will be explained in more detail in conjunction with appended drawings, wherein :
Fig.1 is an explanatory diagram showing a superconductive current lead connecting a superconductive machine to a power supply ;
Fig.2 is a perspective view showing a superconductive current lead of a first preferred embodiment according to the invention ; and `:
i Fig.3 is a perspective view showing a - superconductive current lead of a second preferred i embodiment according to the invention.
` DESCRIPTION OF THE PREFERRED EMBODIMENT
`' Fig. 1 shows a superconductive current lead 4 , 209~595 l 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.
In the first example of the first preferred embodiment, the core 8 is of an oxide system superconductive material(Tl-Pb-Sr-Ba-Ca-Cu-O) including 1223 phase of Tl and Pb single layer system as a main ~:- component, and the alloy covering layer 9 is of Au-5 atomic ~ Pb alloy, wherein each superconducting tape is 2.4 mm in width, 1.4 mm in thickness, and 3.3 mm2 in ,.
:~:. cross-sectional area. The superconductive current :
~ lead 4 thus fabricated is immersed in the liquid helium ~ , 2 having a temperature of 77k, wherein a superconductive critical current of approximately lOOA
is obtained. When current flows through the leads 4 and 5, it is determined that a heat transferred to the 6 20915~
1 liquid helium 2 is approximately 0.05 mW per a current of lA in accordance with the estimation of an evaporation amount of the liquid helium 2. In accordance with the result, it is confirmed that this 5 superconductive current lead 4 has a property having a very small heat transfer. This is resulted from the structure that the alloy covering layer 9 having a low thermal conductivity at a iow temperature is used, so -~ that a heat transferred through the alloy covering 10 layer 9 is decreased.
In case where AC current of 60 Hz flows through the superconductive current lead 4, it is measured that :
a heat of approximately lmN per a current of lA is transferred to the liquid helium 2. This result ~ .1 '~ 15 confirms that the superconductive current lead 4 is a conductor having a property of a very small thermal Y loss. This is resulted from the structure that the .i alloy covering layer 9 has a large electric resistance, -~ so that eddy current loss and coupling current loss of 2Q the conductor are decreased.
~; In the second example of the first preferred embodiment, a superconductive current lead 4 having the same size as that in the first example is fabricated to include a core 8 of an oxide system superconductive 25 material (Bi-Sr-Ca-Cu-O) of Bil2212 system and an alloy covering layer 9 of Ag-3 atomic ~ Au alloy.
A critical current of this superconductive :
7 2~9~59~
1 current lead 4 immersed in the liquid helium 2 at a temperature of 4.2K is 10~ A/cmZ which is the same value as a value obtained in case where pure Ag is used for a covering material. At the same time, a resistivity which is as high as 0.7 to 1.2 ~ Q 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.
In relation to the resistivity of the alloy covering layer 9, a thermal conductivity of the .i `~superconductive current lead 4 become 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 ~,15 compared to that in the case where pure Ag is used for ,,.~
~a covering layer.
'In regard to electric resistance of the ~lconnectors 42 and 41, the resistance value is not only ,~
`~decreased, but also stabilized in the elapse of time.
,~
; 20 In the first and second examples of the `~
,~ preferred embodiment, the thermal conductivity (W/m k) of the alloy covering layer 9 is shown in a below table ' relative to a temperature along with that of a pure Ag covering layer.
.
:
.
1TEMPERATURE FIRST SECOND PURE Ag ; (k) EXAMPLE EXAMPLE
_ _ _ ~ ~
`` 20 75 1 10 25,000 : .
'-"` 10 r,~' ' ~,`~;' ~.,.
~-~ Fig. 3 shows a superconductive current lead of a i~, second preferred embodiment according to the invention.
`` 15 The superconductive current lead comprises a basic -.~
member 10 of alumina, a thin layer 11 of Ag and an . oxide system superconductive layer 12. The alumina `~ basic member 10 may be replaced by an Ag-Au alloy basic member.
20AS described above, 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 ~`~ 25 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.
,":
~'' ' , .
1 Although the invention has been described with respect to specific embodiment for complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modification and alternative constructions that may occur to one skilled in the art which fairly fall within the basic teaching herein set forth.
~ 10 "
`'`'', ,, :, .
~':
Claims (8)
1. A superconductive current lead, comprising :
a predetermined number of superconductive wires each of said superconductive wires, comprising :
a first member of an oxide system superconductive material ; and a second member of a material representing a predetermined thermal conductivity at a temperature lower than a room temperature, said predetermined thermal conductivity being lower than a thermal conductivity at said room temperature.
a predetermined number of superconductive wires each of said superconductive wires, comprising :
a first member of an oxide system superconductive material ; and a second member of a material representing a predetermined thermal conductivity at a temperature lower than a room temperature, said predetermined thermal conductivity being lower than a thermal conductivity at said room temperature.
2. A superconductive current lead, according to claim 1, wherein :
said second member is an alloy including one of Au and Ag as a main component and at least one of Pd, Pt, Mn, Mg, Zr and Au.
said second member is an alloy including one of Au and Ag as a main component and at least one of Pd, Pt, Mn, Mg, Zr and Au.
3. A superconductive current lead, according to claim 1, wherein :
said first member is covered with said second member to provide said superconductive wire ; and said predetermined number of said superconductive wires are stacked.
said first member is covered with said second member to provide said superconductive wire ; and said predetermined number of said superconductive wires are stacked.
4. A superconductive current lead, according to claim 1, wherein :
said first member is layered on one surface of said second member to provide said superconductive wire ; and said predetermined number of said superconductive wires are stacked.
said first member is layered on one surface of said second member to provide said superconductive wire ; and said predetermined number of said superconductive wires are stacked.
5. A superconductive current lead, according to claim 3 or 4, wherein :
said superconductive wire is a tape-shaped wire.
said superconductive wire is a tape-shaped wire.
6. A superconductive current lead, according to claim 1, wherein :
said second member is Ag-Au alloy including Au of less than 15 atomic %.
said second member is Ag-Au alloy including Au of less than 15 atomic %.
7. A superconductive current lead, according to claim 1, wherein :
said second member is Ag-Au alloy including Au of 1 to 10 atomic %.
said second member is Ag-Au alloy including Au of 1 to 10 atomic %.
8. A superconductive current lead, according to claim 1, wherein ;
each of said superconductive wires is a tape shaped wire, in which said first member is covered with said second member, said second member being Ag-Au alloy including Au of 1 to 10 atomic %.
each of said superconductive wires is a tape shaped wire, in which said first member is covered with said second member, said second member being Ag-Au alloy including Au of 1 to 10 atomic %.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4244966A JPH05198434A (en) | 1991-10-14 | 1992-09-14 | Superconductive current lead |
| JP4-244966 | 1992-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2091595A1 true CA2091595A1 (en) | 1994-03-15 |
Family
ID=17126607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002091595A Abandoned CA2091595A1 (en) | 1992-09-14 | 1993-03-12 | 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 and negative integrated current lead structure with spiral section and manufacturing method thereof |
| 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 |
Family Cites Families (5)
| 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 |
| JP2929622B2 (en) * | 1989-11-14 | 1999-08-03 | 住友電気工業株式会社 | How to use oxide superconductor |
| JPH0758602B2 (en) * | 1990-03-27 | 1995-06-21 | 工業技術院長 | Superconducting tape manufacturing method |
| JPH04155715A (en) * | 1990-10-18 | 1992-05-28 | Furukawa Electric Co Ltd:The | Manufacture of ceramic superconductor |
-
1993
- 1993-03-10 EP EP93301815A patent/EP0588461B1/en not_active Expired - Lifetime
- 1993-03-10 DE DE69310649T patent/DE69310649T2/en not_active Expired - Fee Related
- 1993-03-12 CA CA002091595A patent/CA2091595A1/en not_active Abandoned
- 1993-03-12 KR KR1019930003741A patent/KR100275091B1/en not_active IP Right Cessation
- 1993-03-15 CN CN93103129A patent/CN1044941C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0588461A1 (en) | 1994-03-23 |
| CN1084313A (en) | 1994-03-23 |
| KR940007902A (en) | 1994-04-28 |
| DE69310649D1 (en) | 1997-06-19 |
| EP0588461B1 (en) | 1997-05-14 |
| DE69310649T2 (en) | 1997-09-04 |
| CN1044941C (en) | 1999-09-01 |
| KR100275091B1 (en) | 2000-12-15 |
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| JPH05190326A (en) | Permanent current coil |
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