CN113363010A - Stepped high-temperature superconducting CICC conductor with high current carrying capacity - Google Patents
Stepped high-temperature superconducting CICC conductor with high current carrying capacity Download PDFInfo
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- CN113363010A CN113363010A CN202110609598.4A CN202110609598A CN113363010A CN 113363010 A CN113363010 A CN 113363010A CN 202110609598 A CN202110609598 A CN 202110609598A CN 113363010 A CN113363010 A CN 113363010A
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- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/16—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by cooling
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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
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Abstract
The invention belongs to the technical field of superconduction, and particularly relates to a stepped high-temperature superconducting CICC conductor with high current carrying capacity. The invention comprises a cooling medium channel, a conductor framework, a step-shaped high-temperature superconducting strand and a metal sheath, wherein a circular hole is formed in the center of the conductor framework to form the cooling medium channel, and a cooling medium penetrates through the cooling medium channel; the conductor framework is provided with a stepped spiral groove used for installing a stepped high-temperature superconducting strand along the circumferential direction; the metal sheath is of a hollow structure, is sleeved outside the conductor framework, and the inner wall of the metal sheath is in contact with the outer wall of the conductor framework and wraps the stepped high-temperature superconducting strand and the cooling medium channel. The invention can improve the space utilization rate of the existing TSTC type high-temperature superconducting CICC conductor, and enables the TSTC type high-temperature superconducting CICC conductor to have higher current carrying capacity.
Description
Technical Field
The invention belongs to the technical field of superconduction, and particularly relates to a stepped high-temperature superconducting CICC conductor with high current carrying capacity.
Background
Practical low-temperature superconducting NbTi and Nb3Critical transition temperature (T) of Snc) About 9.2K and 18.1K, respectively, and typically operate in the liquid helium temperature zone (4.2K); and T of the first generation high temperature superconducting (Bi system)cAbout 108K, second generation high temperature superconducting (RE series) TcAbout 90K, and is typically run in a liquid nitrogen temperature zone (77K).
Compared with the first generation high-temperature superconducting strip and low-temperature superconducting (NbTi and Nb)3Sn) material and the second generation high temperature superconducting strip have the advantages of higher current carrying capacity, critical magnetic field, mechanical strength and the like, and the high temperature superconducting conductor prepared based on the Sn) material is more suitable for magnet systems of large-scale high-intensity magnetic field devices, such as magnet systems of nuclear fusion devices, large-scale particle colliders, accelerators and the like. At present, the high-temperature superconducting conductors mainly comprise a Roebel type, a TSTC type and a CORC type, wherein the Roebel conductor is formed by weaving high-temperature superconducting tapes which are cut into positive and negative trapezoids by laser, and more tapes are needed to be manufactured into conductors with the same current carrying capacity than other two conductors, so the manufacturing difficulty is high, and the economy is poor; the CORC type conductor is formed by winding a strip material on a circular metal core material, and compared with the TSTC type conductor, the CORC type conductor with the same current carrying capacityThe used belt materials are more, the volume is large, and the economical efficiency is poor. The TSTC conductor is a conductor formed by simply stacking and twisting, and compared with other two conductors, the conductor with the same current carrying capacity needs less strips, so that the preparation process is simple and the economical efficiency is high.
The TSTC type CICC conductor designed for high-field device magnet systems such as fusion reactors, large particle colliders, large accelerators and the like is prepared by adopting a plurality of strands of square stacked conductors, the space utilization rate of the conductor structure is relatively low, and the current carrying capacity of the conductor is improved and limited. In view of the above problems, the present invention provides a TSTC type high temperature superconducting cic conductor structure with high current carrying capacity and mechanical properties suitable for large-scale high-intensity magnetic field magnets.
Disclosure of Invention
The invention aims to provide a stepped high-temperature superconducting CICC conductor with high current carrying capacity, which is prepared based on the current TSTC type conductor, can improve the space utilization rate of the existing TSTC type high-temperature superconducting CICC conductor and enables the TSTC type high-temperature superconducting CICC conductor to have higher current carrying capacity.
The technical scheme adopted by the invention is as follows:
a stepped high-temperature superconducting CICC conductor with high current carrying capacity comprises a cooling medium channel, a conductor framework, stepped high-temperature superconducting strands and a metal sheath, wherein a circular hole is formed in the center of the conductor framework to form the cooling medium channel, and a cooling medium penetrates through the cooling medium channel; the conductor framework is provided with a stepped spiral groove used for installing a stepped high-temperature superconducting strand along the circumferential direction; the metal sheath is of a hollow structure, is sleeved outside the conductor framework, and the inner wall of the metal sheath is in contact with the outer wall of the conductor framework and wraps the stepped high-temperature superconducting strand and the cooling medium channel.
And a pipe penetrating is carried out in the circular hole to form a cooling medium channel.
The cooling medium is liquid helium, supercritical helium, low-temperature gas helium, liquid nitrogen or liquid hydrogen.
The stepped high-temperature superconducting strand is formed by stacking steps with different widths and thicknesses in a centrosymmetric stepped arrangement, the stepped high-temperature superconducting strand is prepared by adopting second-generation high-temperature superconducting strips, all the layers of superconducting strips are connected through a soldering tin material, and a soldering flux with the melting point lower than 200 ℃ is adopted during welding.
The cross section of the metal sheath is in a chamfer square shape and is made of stainless steel, copper, aluminum and alloy thereof.
The cross section of the metal sheath is circular.
The number of the stepped high-temperature superconducting strands is determined to be 3 or more according to the specification and the performance of the conductor.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with CICC conductors with the same size prepared by square conductor strands, the stepped conductor can accommodate more conductor strands, the utilization rate of a space structure can be obviously improved, the current density in the unit volume of the conductor is increased, and the current carrying capacity is improved; the conductor strands are embedded in the skeleton slot cores with the same pitch at a certain pitch, so that the alternating current loss of the conductor can be reduced. The conductor metal sheath can effectively improve the mechanical strength of the conductor and ensure the stability under a high field. In addition, the stepped conductor with high current carrying capacity can effectively reduce the volume of the magnet when the magnet is prepared, and the difficulty of the preparation process of the conductor is low, thereby being beneficial to the overall economy of the conductor application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the prior art solutions, the drawings needed in the embodiments will be briefly described below.
FIG. 1 is a schematic structural diagram of a stepped high-temperature superconducting CICC conductor with high current carrying capacity provided by the invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic structural diagram of another stepped high-temperature superconducting CICC conductor with high current carrying capacity provided by the invention;
FIG. 4 is a schematic cross-sectional view of FIG. 3;
in the figure: 1-cooling medium channel, 2-conductor skeleton, 3-step-shaped high-temperature superconducting strand and 4-metal sheath.
Detailed Description
The invention provides a high-current-carrying capacity stepped high-temperature superconducting CICC conductor, which is further described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1 and fig. 2, a stepped high-temperature superconducting cic conductor with high current-carrying capacity includes a cooling medium channel 1, a conductor framework 2, a plurality of stepped high-temperature superconducting strands 3 and a metal sheath 4, wherein a circular hole is formed in the center of the conductor framework 2 to form the cooling medium channel 1, or a pipe is further inserted into the circular hole to form the cooling medium channel 1;
the cooling medium is usually liquid helium, supercritical helium, cryogenic gas helium, liquid nitrogen or liquid hydrogen, and is used for maintaining the superconducting state of the stepped high-temperature superconducting strands 3.
Except the center of the conductor framework 2 is provided with a round hole, a stepped spiral groove for installing a stepped high-temperature superconducting strand 3 is formed along the circumferential direction;
the metal sheath 4 is of a hollow structure, is sleeved outside the conductor framework 2, the inner wall of the metal sheath is in contact with the outer wall of the conductor framework 2, and the stepped high-temperature superconducting strand 3 and the cooling medium channel 1 are wrapped inside the metal sheath.
The conductor framework 2 is processed by a round long line, a round opening at the center of the axis is a cooling medium channel 1, and the diameter is 2-20 mm; the stepped spiral groove is used for installing the stepped conductor strand 3, and the pitch, the size specification and the like of the stepped spiral groove are designed according to the engineering current density requirement of the conductor, the maximum twisting pitch of the strand, the bending radius and other parameters.
The stepped high-temperature superconducting strand 3 is formed by stacking steps with different widths and thicknesses in a centrosymmetric stepped arrangement, the stepped high-temperature superconducting strand 3 is prepared by adopting a second-generation high-temperature superconducting strip, wherein the width of the strip is 1-5mm, the thickness of the strip is 0.05-0.1mm, each layer of superconducting strips are connected through a soldering tin material, a soldering flux with the melting point lower than 200 ℃ is adopted during welding, and the soldering flux is tin, lead and tin-lead alloy; the order of the stepped high-temperature superconducting strand 3 is controlled within the range of 2-5 according to the width of a strip, the thickness of each step is controlled within a reasonable range according to the actual requirement of a conductor, the thicknesses of different steps of the same strand do not need to be the same, and the stepped high-temperature superconducting strand can be adjusted according to the actual structure and performance requirements of the conductor to ensure that the current carrying capacity is improved.
The cross section of the metal sheath 4 is in a chamfer square shape, as shown in fig. 1 and 2, and the material can be stainless steel, copper, aluminum and alloy thereof.
Example 2
As shown in fig. 3 and 4, the present embodiment is different from embodiment 1 in that:
the cross section of the metal sheath 4 is circular, and the metal sheath has the advantages that the skin effect and the heat dissipation effect in the current transmission process are better than those of a conductor with a square cross section, the processing and the manufacturing are more convenient, and the conductor with the circular cross section is easier to bend and form when a magnet is manufactured. The number of the stepped high-temperature superconducting strands 3 can be determined to be 3 or more according to the specification and the performance of the conductor.
The high current-carrying capacity stepped high-temperature superconducting CICC conductor shown in FIGS. 1 to 4, wherein the number of the stepped superconducting strands 3 is 9, each strand has 5 steps, the overall height is 5mm, each step is 1mm thick, the width of the tape used in each step from outside to inside is respectively 5mm, 4mm, 3mm, 2mm and 1mm, and the thickness is 0.1 mm; typical critical current values of the strip used at 77K @ self field are: 160A, 140A, 130A, 90A, and 70A; therefore, the limit critical current of the stepped CICC conductor with high current carrying capacity can reach 53.1kA when the stepped CICC conductor with high current carrying capacity is 77K. If a conductor of this size is used with 5mm square strands, the number of strands of the conductor is at most 5, and the critical limiting current is 40kA at 77K. According to calculation, the critical current of the same-size stepped CICC conductor is improved by about 33 percent compared with that of the stepped CICC conductor. In the actual preparation process, the thickness of each step of the stepped superconducting strand 3 can be adjusted, the current carrying capacity of the conductor can be further improved, and even if the current carrying capacity of the stepped CICC conductor is calculated according to the same critical performance loss, the current carrying capacity of the stepped CICC conductor can be improved by more than 33% compared with the conductor prepared by the square strand.
The above-described embodiments are merely illustrative of the technical solutions of the present invention and are provided to help understand the principles and concepts of the methods of the present invention. Those skilled in the art will appreciate that various modifications can be made to the present invention without departing from the scope of the invention as defined by the appended claims.
1. A stepped high-temperature superconducting CICC conductor with high current carrying capacity is characterized in that: comprises a cooling medium channel, a conductor framework, a plurality of step-shaped superconducting strands and a metal sheath; the cooling medium channel can directly utilize a central circular hole of the conductor framework or penetrate a pipe in the circular hole; the cooling medium is usually liquid helium, supercritical helium, low-temperature gas helium, liquid nitrogen or liquid hydrogen and is used for maintaining the superconducting state of the superconducting strand; the conductor framework is provided with a circular hole at the center and a stepped spiral groove for installing a stepped superconducting strand; the metal sheath is of a hollow structure, the inner wall of the metal sheath is in contact with the outer wall of the conductor framework, and the conductor strand and the cooling channel are coated in the metal sheath; 2. a high current carrying capacity stepped cic conductor according to claim 1, wherein: compared with the conductor with the same size specification, the current carrying capacity can be improved by more than 33 percent;
3. the conductor former of claim 1, wherein: the framework is processed by a round long line, a round opening is arranged in the center of the axis to form a cooling medium channel or to be tightly matched with a cooling pipeline, and the diameter of the round opening is 2-20 mm; the stepped spiral groove is used for installing conductor strands, and the pitch, the size specification and the like of the stepped spiral groove are designed according to conductor parameters;
4. a stepped conductor strand as defined in claim 1, wherein: the conductor strand wires are formed by arranging stacked strand wires with different widths and thicknesses in a central symmetry step-shaped manner;
5. a conductor strand as claimed in claim 4, wherein: the second generation high temperature superconducting tape is adopted for preparation, and the specification of the tape is as follows: the width is 1-5mm, the thickness is 0.05-0.1mm, and each layer of superconducting tapes are connected through a soldering tin material;
6. a stepped conductor strand according to claim 4, wherein: the order of the stranded wires is controlled within the range of 2-5 according to the width of the strip, the thickness of each order is controlled according to the actual requirement of the conductor, the thicknesses of different orders of the same stranded wire do not need to be the same, and the stranded wire can be adjusted according to the actual structure and performance requirements of the conductor so as to ensure that the current-carrying capacity is improved;
7. the metal sheath of claim 1, wherein: the cross section of the sheath is round or chamfered square, and the material can be stainless steel, copper, aluminum and alloy thereof;
8. the high-current-carrying-capacity stepped high-temperature superconducting CICC conductor according to claim 1, wherein: according to the specification and performance requirements of the conductor, the number of the ladder-shaped conductor strands is 3 or more.
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 person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the technical scope of the present invention.
Claims (7)
1. A stepped high-temperature superconducting CICC conductor with high current carrying capacity is characterized in that: the device comprises a cooling medium channel (1), a conductor framework (2), a stepped high-temperature superconducting strand (3) and a metal sheath (4), wherein a round hole is formed in the center of the conductor framework (2) to form the cooling medium channel (1), and a cooling medium penetrates through the cooling medium channel (1); the conductor framework (2) is provided with a stepped spiral groove used for installing a stepped high-temperature superconducting strand (3) along the circumferential direction; the metal sheath (4) is of a hollow structure, is sleeved outside the conductor framework (2), the inner wall of the metal sheath is in contact with the outer wall of the conductor framework (2), and the stepped high-temperature superconducting strand (3) and the cooling medium channel (1) are coated inside the metal sheath.
2. The high-current-carrying-capacity stepped high-temperature superconducting CICC conductor according to claim 1, wherein: the circular holes are penetrated with pipes to form cooling medium channels (1).
3. The high-current-carrying-capacity stepped high-temperature superconducting CICC conductor according to claim 1, wherein: the cooling medium is liquid helium, supercritical helium, low-temperature gas helium, liquid nitrogen or liquid hydrogen.
4. The high-current-carrying-capacity stepped high-temperature superconducting CICC conductor according to claim 1, wherein: the step-shaped high-temperature superconducting strand (3) is formed by stacking steps with different widths and thicknesses in a centrosymmetric step-shaped arrangement, the step-shaped high-temperature superconducting strand (3) is prepared by adopting second-generation high-temperature superconducting strips, all the layers of superconducting strips are connected through a soldering tin material, and a soldering flux with the melting point lower than 200 ℃ is adopted during welding.
5. The high-current-carrying-capacity stepped high-temperature superconducting CICC conductor according to claim 1, wherein: the cross section of the metal sheath (4) is in a chamfer square shape and is made of stainless steel, copper, aluminum and alloy thereof.
6. The high-current-carrying-capacity stepped high-temperature superconducting CICC conductor according to claim 1, wherein: the cross section of the metal sheath (4) is circular.
7. The high-current-carrying-capacity stepped high-temperature superconducting CICC conductor according to claim 1, wherein: the number of the stepped high-temperature superconducting strands (3) is determined to be 3 or more according to the specification and the performance of the conductor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011156139 | 2020-10-26 | ||
| CN2020111561397 | 2020-10-26 |
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| CN113363010A true CN113363010A (en) | 2021-09-07 |
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| CN115579184A (en) * | 2022-11-14 | 2023-01-06 | 核工业西南物理研究院 | Superconducting conductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115579184A (en) * | 2022-11-14 | 2023-01-06 | 核工业西南物理研究院 | Superconducting conductor |
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