CN113436802A - Quasi-isotropic conductor connection method - Google Patents
Quasi-isotropic conductor connection method Download PDFInfo
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- CN113436802A CN113436802A CN202110753088.4A CN202110753088A CN113436802A CN 113436802 A CN113436802 A CN 113436802A CN 202110753088 A CN202110753088 A CN 202110753088A CN 113436802 A CN113436802 A CN 113436802A
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- Prior art keywords
- quasi
- isotropic
- temperature superconducting
- joint
- conductor
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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
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/04—Single wire
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/03—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations
- H01R11/09—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations the connecting locations being identical
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention discloses a quasi-isotropic conductor joint which comprises a first-generation BSCCO high-temperature superconducting tape and a copper sheath, wherein aluminum materials are filled between the BSCCO high-temperature superconducting tape and the copper sheath, the BSCCO high-temperature superconducting tapes are connected through soldering tin, and the BSCCO high-temperature superconducting tapes are stacked into four sub-strands of quasi-isotropic conductors with the same layout. The long BSCCO high-temperature superconducting tapes and the short BSCCO high-temperature superconducting tapes are arranged at intervals, and are crossly stacked and welded with the second generation REBCO high-temperature superconducting tapes in the quasi-isotropic conductors at the two ends. The jacket of the quasi-isotropic conductor is cut off at the end of the short REBCO high-temperature superconducting tape, and the jacket of the joint extends to the end of the long BSCCO high-temperature superconducting tape. According to the invention, the BSCCO high-temperature superconducting strip is used as a joint, and a cross stacking and welding method is adopted, so that the resistance of the joint is greatly reduced, and the current can be uniformly distributed.
Description
Technical Field
The invention relates to the field of superconducting magnets, in particular to a quasi-isotropic conductor joint.
Background
At present, the superconducting technology is widely applied to the fields of power systems, energy sources, medical treatment, traffic, military industry and the like, wherein the large scientific engineering is an important field for the application of the superconducting technology. The superconducting magnet has no joule heat loss when stably running, can save a large amount of energy for the magnet needing to obtain a direct-current strong magnetic field in a larger space, has small required excitation power, does not need huge water supply and purification equipment like a conventional magnet, and provides a necessary technical basis for the development of a large scientific engineering device. The quasi-isotropic conductor connects the second generation REBCO high temperature superconducting tape in parallel in a certain way, the mechanical property is good, and the critical current has the characteristic of quasi-isotropy, so that the quasi-isotropic conductor is a powerful choice for winding the superconducting magnet exciting coil. However, since the processing length of the quasi-isotropic conductor is limited due to technical problems, the joint is indispensable for a large superconducting magnet device.
Joint design is related to stable operation of the superconducting magnet system, so joint technology is one of key technologies of the superconducting magnet system. The traditional joint technology of the quasi-isotropic conductor has large terminating resistance value, poorer electrical performance and uncertain mechanical stability. The invention discloses a quasi-isotropic conductor joint with good mechanical and electrical properties and strong practicability, which needs to improve the traditional joint structure and the implementation method.
Summary of the invention 1
The invention aims to provide a quasi-isotropic conductor joint, which takes a first generation BSCCO high-temperature superconducting tape as a connecting part and adopts a cross stacking and welding method to ensure that the conductor and the joint are in good contact.
The technical scheme of the invention is as follows:
a quasi-isotropic conductor joint, comprising: the quasi-isotropic conductor comprises a BSCCO high-temperature superconducting tape and a copper sheath, wherein aluminum materials are filled between the BSCCO high-temperature superconducting tape and the copper sheath, and the BSCCO high-temperature superconducting tape is connected through soldering tin and stacked into four sub-strands of quasi-isotropic conductors with the same layout. The long BSCCO high-temperature superconducting tapes and the short BSCCO high-temperature superconducting tapes are arranged at intervals, are crossly stacked with the REBCO high-temperature superconducting tapes in the quasi-isotropic conductors at the two ends and are welded. The jacket of the quasi-isotropic conductor is cut off at the end of the short REBCO high-temperature superconducting tape, and the jacket of the joint extends to the end of the long BSCCO high-temperature superconducting tape.
A quasi-isotropic conductor joint, comprising: the BSCCO high temperature superconducting tape may operate at a higher temperature than the REBCO high temperature superconducting tape.
A quasi-isotropic conductor joint, comprising: the four sub-strands of the quasi-isotropic conductor are two transverse stacks and two longitudinal stacks in a centrosymmetric layout.
A quasi-isotropic conductor joint, comprising: the sheath is made of a copper sheath and aluminum filler.
The BSCCO high-temperature superconducting tape is a first-generation high-temperature superconducting material, 80 tapes are used in parallel in a welding mode when used as a joint, a circle of copper sheath with the thickness of 2mm is wrapped on the outer side of the joint in order to protect the BSCCO high-temperature superconducting tape, and aluminum materials are filled between the tapes and the copper sheath. The BSCCO high-temperature superconducting tape and the REBCO high-temperature superconducting tape in the quasi-isotropic conductor are crossed, stacked and welded in a long-short matching mode, so that the BSCCO high-temperature superconducting tape and the REBCO high-temperature superconducting tape are tightly connected, and the BSCCO high-temperature superconducting tape and the REBCO high-temperature superconducting tape have good electrical and mechanical properties.
The REBCO high-temperature superconducting tape is a second-generation high-temperature superconducting material, belongs to a brittle ceramic material, and has the characteristic of anisotropy in critical current.
The length of the joint can be adjusted according to the requirement, the sheath of the quasi-isotropic conductor before connection is cut off at the end part of the short REBCO high-temperature superconducting tape, and the sheath of the joint extends to the end part of the long BSCCO high-temperature superconducting tape.
The assembly process of the invention is as follows:
coating a thin layer of soldering tin on the prepared short BSCCO high-temperature superconducting tape finished product, pressing the long tape on the short tin-coated tape, stacking the long tape at intervals into four centrosymmetric sub-strands, sleeving a circular copper sheath close to the edge of the tape, and filling aluminum between the two.
The jacket of the quasi-isotropic conductor is cut at the end of the short REBCO high temperature superconducting tape.
The solder is poured into the connector member, the temperature of the solder is controlled to about 220 ℃, the quasi-isotropic conductor terminal is inserted into the connector member, and the solder is cooled.
The invention has the advantages that:
(1) and the BSCCO high-temperature superconducting strip is used as the joint, so that the electrical property of the joint is effectively improved.
(2) The connection is carried out by adopting a cross stacking and welding method, so that the joint is compact and firm and has good mechanical stability.
(3) The joint resistance of the high-temperature superconducting material is greatly reduced by matching the welding technology with the joint of the high-temperature superconducting material.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
The specific implementation mode is as follows:
see figure 1.
A quasi-isotropic conductor joint comprises a BSCCO high-temperature superconducting tape 2 and a copper sheath 4, wherein an aluminum material 3 is filled between the BSCCO high-temperature superconducting tape 2 and the copper sheath 4, the BSCCO high-temperature superconducting tape 2 is connected through soldering tin, and four sub-strands 5 of quasi-isotropic conductors with the same layout are stacked. The long and short BSCCO high-temperature superconducting tapes 2 are arranged at intervals, and are crossed, stacked and welded with the REBCO high-temperature superconducting tapes 1 in the quasi-isotropic conductors at the two ends. The sheath of the quasi-isotropic conductor is cut off at the end of the short REBCO high-temperature superconducting tape 1, and the sheath of the joint extends to the end of the long BSCCO high-temperature superconducting tape 2.
BSCCO high temperature superconducting tape 2 may operate at a higher temperature than REBCO high temperature superconducting tape 1.
The four sub-strands 5 of the quasi-isotropic conductor are two transverse stacks and two longitudinal stacks in a centrosymmetric layout.
The sheath is a copper sheath 4 and aluminum filler 3.
Summary of the invention 2
The technical problem to be solved by the invention is to provide a quasi-isotropic conductor joint, wherein two square grooves are formed in a red copper block processed into a track shape to form an upper cavity and a lower cavity, the tail end of a quasi-isotropic conductor is welded in the lower cavity, and the head end of the quasi-isotropic conductor is welded in the upper cavity, so that good mechanical and electrical properties are ensured, the height of the quasi-isotropic conductor can be automatically lifted when the next layer of a coil wound is transferred to the previous layer, and conductor climbing is avoided.
The technical scheme of the invention is as follows:
a quasi-isotropic conductor joint, comprising: the device comprises a lower cavity and an upper cavity, wherein the upper cavity and the lower cavity are formed by slotting from a red copper block, and a square slot is slightly larger than the size of a quasi-isotropic conductor stack so as to be filled with solder for tight connection. The red copper block is designed into a runway shape, the diameters of the upper semicircle and the lower semicircle are equal to the diameter of the quasi-isotropic conductor, and the height of the red copper block is equal to the height of the two quasi-isotropic conductors. The joint weld is a de-jacketed quasi-isotropic conductor stack.
A quasi-isotropic conductor joint, comprising: the quasi-isotropic conductor stack is a square stack consisting of two transverse stacks and two longitudinal stacks in a centrosymmetric layout.
A quasi-isotropic conductor joint, comprising: the sheath is made of a copper sheath and aluminum filler.
The REBCO high-temperature superconducting tape is a second-generation high-temperature superconducting material, belongs to a brittle ceramic material, has the characteristic of anisotropic critical current, and aims to overcome the defects of the REBCO high-temperature superconducting tape, 80 REBCO high-temperature superconducting tapes with the width of 2mm are stacked into a quasi-isotropic conductor in a centrosymmetric configuration, a copper sleeve with the thickness of 0.2mm for protection and stabilization is arranged outside the conductor, and aluminum materials are filled between the stack and the copper sleeve.
The length of the joint can be adjusted as desired, but the length affects the amount of resistance of the joint, and the quasi-isotropic conductor stack for the soldered portion of the joint is debuffered.
The manufacturing process of the invention is as follows:
a piece of red copper is cut into a runway shape with designed size, the thickness is 5.5cm, an upper cavity and a lower cavity are formed by slotting at specified positions, and the centers of 4.2mm multiplied by 4.2mm square notches are respectively superposed with the circle centers of an upper semicircle and a lower semicircle of a joint.
And removing the sheath of the quasi-isotropic conductor for the welding part of the joint, wherein the length of the removed sheath is 4.8cm and is slightly smaller than the depth of the square groove by 5 cm.
And (3) coating phosphoric acid with a certain concentration on the inner wall of the square groove and the REBCO high-temperature superconducting tape for termination and drying.
And (3) pouring soldering tin into the square groove, controlling the temperature of the soldering tin to be about 220 ℃, inserting the quasi-isotropic conductor terminal part into the groove, and cooling and solidifying the soldering tin.
The invention has the advantages that:
(1) the joint is made by cutting the groove on the whole red copper, the structure is simple, and the welding operation is convenient.
(2) And the joint adopts a structure with an upper cavity and a lower cavity, so that the length of the copper material is reduced, the cross section is increased, and the resistance of the joint is reduced.
(3) After the copper surface is treated by phosphoric acid, the welding can be firmer and firmer, and the mechanical stability of the joint is improved.
(4) And the design of the size of the runway-shaped joint ensures that when the coil is wound, the height of a quasi-isotropic conductor can be automatically lifted when the coil is transferred from the next layer to the previous layer, so that the conductor is prevented from climbing.
Description of the drawings:
FIG. 2 is a schematic view of the structure of the present invention.
Fig. 3 is a front view of the joint.
Fig. 4 is a left side view of the joint.
The specific implementation mode is as follows:
see figures 2, 3, 4.
A quasi-isotropic conductor joint comprises a lower chamber 7 and an upper chamber 5, wherein the upper chamber and the lower chamber are formed by slotting red copper blocks 1, and square slots are slightly larger than the size of quasi-isotropic conductor stacks 3 and 6, so that solder is filled for tight connection. The red copper block 1 is designed into a runway shape, the diameters of the upper semicircle and the lower semicircle are equal to the diameters of the quasi-isotropic conductors, and the height of the red copper block 1 is equal to the height of the two quasi-isotropic conductors. The joint weld removes the REBCO coated conductor square stacks 3, 6 of the armors 2, 4 for the quasi-isotropic conductors.
The quasi-isotropic conductor stacks 3, 6 are square stacks of two transverse stacks and two longitudinal stacks in a centrosymmetric layout.
The armors 2 and 4 are made of copper sheaths and aluminum fillers.
Summary of the invention 3
The invention provides a quasi-isotropic conductor joint, which is characterized in that a red copper block is processed into a cuboid with a square cross section, a chamfer is formed on a side line along the length direction of the joint, then a groove is formed to form a left cavity and a right cavity, the left cavity is used for welding the tail end of the previous quasi-isotropic conductor, the right cavity is used for welding the head end of the next quasi-isotropic conductor, the joint is simple to manufacture, and the quasi-isotropic conductor after being sheathed is only required to be stacked and inserted into a cavity filled with soldering tin during connection.
The technical scheme of the invention is as follows:
a quasi-isotropic conductor joint, comprising: the device comprises a left cavity and a right cavity, wherein the left cavity and the right cavity are formed by slotting from a red copper block, and a square slot is slightly larger than the size of a quasi-isotropic conductor stack so as to be filled with solder for welding. The section of the red copper block is square, and chamfering operation is carried out on four side lines along the length direction of the joint. The joint weld is a de-jacketed quasi-isotropic conductor stack.
A quasi-isotropic conductor joint, comprising: the quasi-isotropic conductor stack is a square stack consisting of two transverse stacks and two longitudinal stacks in a centrosymmetric layout.
A quasi-isotropic conductor joint, comprising: the sheath is made of a copper sheath and aluminum filler.
The REBCO high temperature superconducting tapes and quasi-isotropic conductors to which the present invention relates are as described in summary 2.
The length of the joint can be adjusted according to the needs, including the depth of the groove and the thickness of the middle solid area, the mechanical stability can be better obtained by properly increasing the depth of the groove, and when the quasi-isotropic conductor transmits large current, the red copper in the middle solid area needs to be thick enough to bear the current, but the longer the length, the larger the resistance.
The manufacturing process of the invention is as follows:
a piece of red copper is cut into a cuboid with the size of 4.6mm multiplied by 110mm, chamfering operation is carried out on four edges vertical to the square cross section, a groove is respectively formed in the centers of the left end surface and the right end surface to form a left cavity and a right cavity, and the size of each cavity is 4.2mm multiplied by 50 mm.
The 48mm length of jacket was removed at the quasi-isotropic conductor ends, and the exposed quasi-isotropic conductors were stacked for soldering in the left and right chambers of the joint.
And (3) coating phosphoric acid with certain concentration on the inner walls of the left and right chambers and the quasi-isotropic conductor stack for termination and airing.
And pouring a certain amount of soldering tin into the cavity, controlling the temperature of the soldering tin to be about 220 ℃, inserting the terminal part of the quasi-isotropic conductor, and cooling and solidifying the soldering tin.
The joint is easy to manufacture and low in cost, welding operation is simple, welding between copper coated with phosphoric acid is firmer, and mechanical stability is good.
Description of the drawings:
FIG. 5 is a schematic view of the structure of the present invention.
Fig. 6 is a front view of the joint.
The specific implementation mode is as follows:
see fig. 5 and 6.
A quasi-isotropic conductor joint comprises a left cavity 5 and a right cavity 6, wherein the left cavity and the right cavity are formed by slotting a red copper block 1, and a square slot is slightly larger than the size of a quasi-isotropic conductor stack 3, 7, so that welding is carried out by filling welding flux. The red copper block 1 is square in cross section and chamfered along four edges of the length direction of the joint. The joint weld is a quasi-isotropic conductor stack 3, 7 with the can 2, 4 removed.
The quasi-isotropic conductor stacks 3, 7 are square stacks of two transverse stacks and two longitudinal stacks in a centrosymmetric layout.
The jackets 2 and 4 are copper sheaths and aluminum fillers.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes and substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein should be covered within the scope of the present invention.
Claims (6)
1. A quasi-isotropic conductor joint, comprising: the BSCCO high-temperature superconducting tapes and the copper sheath are filled with aluminum materials, the BSCCO high-temperature superconducting tapes are connected through soldering tin and stacked into four sub-strands of quasi-isotropic conductors with the same layout, the long BSCCO high-temperature superconducting tapes and the short BSCCO high-temperature superconducting tapes are arranged at intervals and are stacked and welded with the second generation REBCO high-temperature superconducting tapes in the quasi-isotropic conductors at two ends in a crossed mode, a sheath of the quasi-isotropic conductors is cut off at the end of the short REBCO high-temperature superconducting tape, and a sheath of a joint extends to the end of the long BSCCO high-temperature superconducting tape.
2. A quasi-isotropic conductor joint as claimed in claim 1, wherein: the BSCCO high temperature superconducting tape may operate at a higher temperature than the REBCO high temperature superconducting tape.
3. A quasi-isotropic conductor joint, comprising: the welding device comprises a lower cavity and an upper cavity, wherein the upper cavity and the lower cavity are formed by slotting from a red copper block, a square groove is slightly larger than the stacking size of quasi-isotropic conductors, the red copper block is filled with solder to be tightly connected, the red copper block is designed into a track shape, the diameters of an upper semicircle and a lower semicircle are equal to the diameter of the quasi-isotropic conductors, the height of the red copper block is equal to the height of the two quasi-isotropic conductors, and a joint welding part is formed by stacking the quasi-isotropic conductors without a sheath.
4. A quasi-isotropic conductor joint, comprising: the welding device comprises a left cavity and a right cavity, wherein the left cavity and the right cavity are formed by slotting from a red copper block, a square groove is slightly larger than the size of the quasi-isotropic conductor stack, welding materials are filled in the square groove for welding, the cross section of the red copper block is square, chamfering operation is carried out on four edges along the length direction of a joint, and the joint welding part is the quasi-isotropic conductor stack for removing a sheath.
5. A quasi-isotropic conductor joint as claimed in claims 1, 3, 4, wherein: the four sub-strands of the quasi-isotropic conductor and the quasi-isotropic conductor stack are square stacks consisting of two transverse stacks and two longitudinal stacks in a centrosymmetric layout.
6. A quasi-isotropic conductor joint as claimed in claims 1, 3, 4, wherein: the sheath is made of a copper sheath and aluminum filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110753088.4A CN113436802A (en) | 2021-07-02 | 2021-07-02 | Quasi-isotropic conductor connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110753088.4A CN113436802A (en) | 2021-07-02 | 2021-07-02 | Quasi-isotropic conductor connection method |
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| Publication Number | Publication Date |
|---|---|
| CN113436802A true CN113436802A (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110753088.4A Pending CN113436802A (en) | 2021-07-02 | 2021-07-02 | Quasi-isotropic conductor connection method |
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| CN (1) | CN113436802A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10326634A (en) * | 1997-05-26 | 1998-12-08 | Toshiba Corp | Method for connecting superconductor |
| JP2005310507A (en) * | 2004-04-21 | 2005-11-04 | Mitsubishi Electric Corp | Connection structure of superconductive cic conductor |
| CN111226322A (en) * | 2017-08-25 | 2020-06-02 | 托卡马克能量有限公司 | Superconducting joint using peel-off ReBCO |
-
2021
- 2021-07-02 CN CN202110753088.4A patent/CN113436802A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10326634A (en) * | 1997-05-26 | 1998-12-08 | Toshiba Corp | Method for connecting superconductor |
| JP2005310507A (en) * | 2004-04-21 | 2005-11-04 | Mitsubishi Electric Corp | Connection structure of superconductive cic conductor |
| CN111226322A (en) * | 2017-08-25 | 2020-06-02 | 托卡马克能量有限公司 | Superconducting joint using peel-off ReBCO |
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