High-current-carrying TSTC high-temperature superconducting cable for fusion

Abstract

The invention relates to the technical field of superconducting cables, in particular to a high-current-carrying TSTC high-temperature superconducting cable for fusion, and the cable comprises a metal conductor skeleton which is provided with a stepped groove in the circumferential direction, and is provided with a cooling medium channel in the middle; the superconducting tape is laid in the stepped groove in a laminated manner; the partition plate is arranged in the stepped groove in the depth direction of the stepped groove and used for dividing the stepped groove into two containing cavities with symmetrical structures; the pressing plate is arranged at the end, away from the cooling medium channel, of the partition plate and used for fixing the superconducting tape. According to the high-current-carrying TSTC high-temperature superconducting cable for fusion provided by the invention, the superconducting tapes with different bandwidths and types are laminated in each layer of strip-shaped groove of the stepped groove, so that the types and the bandwidths of the superconducting tapes are optimized, the current-carrying capability of the superconducting cable is improved, the twisted superconducting tapes can be fixed, and the superconducting tapes are prevented from falling off from the stepped groove.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting cables, and in particular to a high-current-carrying TSTC high-temperature superconducting cable for fusion. Background Art

[0002] With the development of superconducting materials, high-current superconducting conductors based on second-generation high-temperature superconducting tapes have gradually become the main body in the field of superconducting cables. TSTC conductors (Twisted Stacked-Tapes Cable, hereinafter referred to as "TSTC conductors") based on superconducting materials have good mechanical properties, excellent current density and bending properties. At liquid nitrogen temperature, the contact resistance is less than 10nW, the critical current reaches 1.5kA, and it can reach 10kA at liquid helium temperature. It is mainly used in superconducting power equipment and large high-field superconducting magnets. However, TSTC conductors have problems such as limited current carrying capacity and easy shedding of the tape during twisting. Summary of the invention

[0003] The invention provides a high-current-carrying TSTC high-temperature superconducting cable for fusion, which is used to solve the problem of how to improve the current-carrying capacity of the TSTC conductor and prevent the strip from falling off during torsion.

[0004] The present invention provides a high current carrying TSTC high temperature superconducting cable for fusion, comprising: The metal conductor skeleton has stepped grooves in the circumferential direction and a cooling medium channel in the middle; Superconducting tapes are stacked and laid in the stepped grooves; A partition plate is arranged in the step groove along the depth direction of the step groove, and is used to separate the step groove into two symmetrical accommodating cavities; A pressing plate is arranged at one end of the partition away from the cooling medium channel and is used to fix the superconducting tape.

[0005] In some embodiments, the metal conductor skeleton is made of copper or aluminum.

[0006] In some embodiments, a cooling medium channel runs through the axial direction of the metal conductor skeleton, and a coolant is passed into the cooling medium channel, and the coolant is liquid nitrogen or liquid helium.

[0007] In some of the embodiments, there are multiple stepped grooves evenly distributed around the circumference of the metal conductor skeleton.

[0008] In some of the embodiments, the stepped groove is arranged in a spiral shape along the outer circumference of the metal conductor skeleton, and the inner diameter of the stepped groove increases continuously in a direction away from the cooling medium channel.

[0009] In some of the embodiments, the stepped groove includes at least two parallel strip grooves, and the width of the strip grooves includes 4 mm, 6 mm, 8 mm, and 12 mm.

[0010] In some embodiments, the material of the superconducting tape includes yttrium barium copper oxide, bismuth strontium calcium copper oxide, and iron-based superconductor.

[0011] In some embodiments, the partition is made of copper or aluminum, and the partition is integrally formed with the metal conductor frame.

[0012] In some of the embodiments, the pressure plate is a spiral plate, a receiving groove is provided on the spiral plate, the receiving groove is filled with superconducting tape, and the spiral plate is detachably connected to the partition.

[0013] In some of the embodiments, the pressure plate is a flat spring, the middle of the spring is filled with superconducting tape, and both sides of the spring are connected to the metal conductor skeleton.

[0014] The beneficial effects of the present invention are as follows: 1. By arranging twisted stepped grooves on the outer periphery of the metal conductor skeleton, by stacking superconducting tapes of different bandwidths and types in each layer of the stepped grooves, by optimizing the type and bandwidth of the superconducting tapes, the current carrying capacity of the superconducting cable is improved, and the problem of reduced current carrying capacity caused by twisting and bending is solved; 2. The partition divides the step groove into two symmetrical accommodating cavities, in which superconducting tapes are placed respectively. The partition can effectively divert faults; 3. By setting a pressure plate on the side of the partition and the superconducting tape away from the cooling medium channel, on the one hand, the pressure plate can protect the partition, improve the mechanical strength of the partition, and prevent the superconducting tapes on both sides of the partition from squeezing the partition to deform and bend; on the other hand, the pressure plate can fix the superconducting tape in torsion, prevent the superconducting tape from falling off from the step groove, and prevent the superconducting tape from producing dislocation movement that affects the current-carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of a high current carrying TSTC high temperature superconducting cable for fusion of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the metal conductor skeleton shown; Figure 3 yes Figure 1 A schematic structural diagram of a specific embodiment of the pressing plate shown; Figure 4 yes Figure 1 A schematic structural diagram of another specific embodiment of a pressing plate is shown.

[0016] In the attached drawings, 1, metal conductor skeleton; 2, stepped groove; 3, cooling medium channel; 4, superconducting tape; 5, partition; 6, pressure plate; 61, spiral plate; 62, receiving groove; 7, spring; 8, hook. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] As described in the background art, the conventional TSTC conductor has limited current carrying capacity and the superconducting tape is prone to fall off during twisting. Therefore, how to improve the current carrying capacity of the TSTC conductor and prevent the superconducting tape from falling off during twisting has become a technical problem that needs to be solved urgently by those skilled in the art.

[0019] To solve the above problems, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention provides a high-current TSTC high-temperature superconducting cable for fusion, comprising: a metal conductor skeleton 1, a superconducting tape 4, a partition 5 and a pressing plate 6. The metal conductor skeleton 1 is provided with at least one step groove 2 in the circumferential direction, and the step groove 2 is spirally coiled and twisted along the outer circumference of the metal conductor skeleton 1, and the superconducting tape 4 is stacked and laid in the step groove 2. A cooling medium channel 3 is provided in the middle of the metal conductor skeleton 1, and the cooling medium channel 3 is arranged along the axial direction of the metal conductor skeleton 1. A cooling medium is passed into the cooling medium channel 3 to cool the metal conductor skeleton 1. The partition 5 is arranged in the step groove 2 along the depth direction of the step groove 2, and is used to divide the step groove 2 into two symmetrical accommodating cavities, that is, a first accommodating cavity and a second accommodating cavity, and the superconducting tape 4 is placed in the first accommodating cavity and the second accommodating cavity respectively. The pressing plate 6 is arranged at one end of the partition 5 away from the cooling medium channel 3, that is, the pressing plate 6 is arranged on the side of the superconducting tape 4 away from the cooling medium channel 3, and squeezes and fixes the superconducting tape 4.

[0020] The high current carrying TSTC high temperature superconducting cable for fusion of the present invention is provided with a twisted stepped groove 2 on the periphery of the metal conductor skeleton 1, and by stacking superconducting tapes 4 of different bandwidths and types in each layer of the strip grooves of the stepped groove 2, and by optimizing the type and bandwidth of the superconducting tape 4, the current carrying capacity of the superconducting cable is improved, and the problem of reduced current carrying capacity caused by twisting and bending is solved. The partition 5 divides the stepped groove 2 into two symmetrical accommodating cavities, and the superconducting tapes 4 are respectively placed in the two accommodating cavities, and the partition 5 can effectively play the role of fault diversion. By arranging a pressure plate 6 on the side of the partition 5 and the superconducting tape 4 away from the cooling medium channel, on the one hand, the pressure plate 6 can protect the partition 5, improve the mechanical strength of the partition 5, and prevent the superconducting tapes 4 on both sides of the partition 5 from squeezing the partition 5 to deform and bend; on the other hand, the pressure plate 6 can fix the superconducting tape 4 in torsion, prevent the superconducting tape 4 from falling off from the stepped groove 2, and prevent the superconducting tape 4 from generating dislocation movement to affect the current carrying capacity.

[0021] Preferably, the material of the metal conductor skeleton 1 is a copper rod or an aluminum rod processed into a spiral multi-groove structure on the periphery. On the one hand, copper and aluminum have excellent thermal conductivity, which is convenient for transferring the low-temperature medium in the cooling medium channel 3 to the superconducting tape 4 to cool the superconducting tape 4; on the other hand, copper and aluminum have good strength, and after the periphery is processed into a spiral step groove 2, they can still support the superconducting tape 4 and the cooling medium channel 3 in the step groove 2.

[0022] Preferably, the cross section of the cooling medium channel 3 is circular, the cooling medium channel 3 runs through the axial direction of the metal conductor skeleton 1, and a coolant is passed into the cooling medium channel 3, and the coolant is liquid nitrogen or liquid helium. The coolant cools the superconducting tape 4, so that the superconducting tape 4 in the spiral step groove 2 is always in a superconducting state.

[0023] Preferably, there are multiple stepped grooves 2 , which may be 3, 4, 5, 6 or 8, and are evenly distributed in the circumference of the metal conductor skeleton 1 .

[0024] In some embodiments, the step grooves 2 are arranged in a spiral shape along the outer circumference of the metal conductor skeleton 1, and the inner diameter of the step grooves 2 along the direction away from the cooling medium channel 3 is continuously increased. On the one hand, it is convenient to place the superconducting tape 4 to be laid, and the operation is convenient; on the other hand, in order to ensure the thickness of the metal conductor skeleton 1 between two adjacent step grooves 2, and then ensure the overall strength and support of the metal conductor skeleton 1.

[0025] Preferably, the stepped groove 2 includes at least two parallel strip grooves, and the width of the strip grooves includes 4 mm, 6 mm, 8 mm, and 12 mm, thereby matching the thickness specification of the appropriate superconducting tape 4.

[0026] Preferably, the material of the superconducting tape 4 includes yttrium barium copper oxide, bismuth strontium calcium copper oxide, and iron-based superconductor.

[0027] Preferably, the material of the partition 5 is a superconducting material with low resistance and high hardness, such as copper or aluminum. This design helps to improve the overall mechanical stability and heat conduction efficiency of the conductor. The partition 5 is integrally formed with the metal conductor skeleton 1.

[0028] Preferably, the pressing plate 6 is fixedly connected or detachably connected to the metal conductor skeleton 1, and the pressing plate 6 is detachably connected to the partition 5. A receiving groove 62 is provided in the pressing plate 6. By inserting the superconducting tape 4 into the receiving groove 62, the current carrying capacity of the pressing plate 6 is improved while ensuring that the pressing plate 6 improves the fixing effect of the partition 5 and prevents the superconducting tape 4 from falling off from the stepped groove 2, thereby improving the overall current carrying capacity of the TSTC high-temperature superconducting cable.

[0029] like Figure 3 As shown, the pressing plate 6 is exemplarily a spiral plate 61, and a receiving groove 62 is provided on the spiral plate 61. The receiving groove 62 is filled with superconducting tape 4, thereby improving the current carrying capacity of the pressing plate 6. The spiral plate 61 is detachably connected to the partition 5. Specifically, a plug-in method can be adopted, and the end of the partition 5 is provided with a protrusion at intervals, and the middle of the pressing plate 6 is provided with a groove, and the protrusion is embedded in the groove, thereby realizing the detachable connection between the pressing plate 6 and the partition 5. The two sides of the pressing plate 6 are respectively fixedly connected to the metal conductor skeleton 1, thereby improving the strength between the pressing plate 6 and the metal conductor skeleton 1, and effectively preventing the superconducting tape 4 from slipping from the stepped groove 2, affecting the current carrying capacity of the superconducting cable.

[0030] like Figure 4 As shown, exemplarily, the pressing plate 6 is a flat spring 7, the interior of the spring 7 is filled with superconducting tape 4, the two sides of the spring 7 can be fixedly connected to the metal conductor skeleton 1, and hooks 8 can also be designed, and the metal conductor skeleton 1 is provided with grooves adapted to the hooks 8, so as to realize the detachable connection between the pressing plate 6 and the metal conductor skeleton 1. The spring 7 and the partition 5 are detachably connected, which can be realized specifically by the engagement of the protrusion and the groove. The pressing plate 6 is designed as a flat spring 7. On the one hand, the spring 7 has good adaptability and can be adaptively adjusted according to the spiral torsion of the stepped groove 2 and the partition 5; the flat internal space formed by the spiraling of the spring 7 is convenient for filling the superconducting tape 4, thereby improving the current carrying capacity of the pressing plate 6 and the superconducting cable.

[0031] refer to Figure 1As shown, for example, the number of stepped grooves 2 is 4, evenly distributed around the metal conductor skeleton 1, and the partition 5 is located in the middle of the stepped groove 2. The partition 5 divides each stepped groove 2 into two identical accommodating cavities, each of which includes three twisted strip grooves, which include the first strip groove, the second strip groove and the third strip groove in the direction away from the cooling medium channel. The first strip groove has a width of 2 mm and a height of 3.1 mm; the second strip groove has a width of 4 mm and a height of 2.6 mm; the third strip groove has a width of 6 mm and a height of 2.1 mm. The first strip groove can hold 25 2 mm wide superconducting tapes 4, the second strip groove can hold 20 4 mm wide superconducting tapes 4, and the third strip groove can hold 25 6 mm wide superconducting tapes. Two superconducting tapes 4 can be inserted into the middle of the pressure plate 6, and 142 superconducting tapes 4 can be placed in each stepped groove 2. The critical current of each superconducting tape 4 is 120A, and the critical current of each stepped groove 2 is as high as 16.8KA. The critical current of the entire TSTC high-temperature superconducting cable is 67.2KA.

[0032] The present invention is based on TSTC conductors. The conventional single slot is only rectangular, and the number of added strips is limited. The present invention changes the structure of the slot and designs it into a stepped slot. The size of the strip used and the current carrying capacity are more options, and the current carrying capacity is improved to meet the needs of large-scale current in fusion. Because its torsion may cause back-twist deformation, resulting in an increase in the cable pitch, a partition is added in the stepped slot, and a pressure plate is designed on the stepped slot to reinforce the superconducting tape in the stepped slot and increase its mechanical strength.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0037] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high current carrying TSTC high temperature superconducting cable for fusion, characterized in that: include: The metal conductor skeleton has stepped grooves in the circumferential direction and a cooling medium channel in the middle; Superconducting tapes are stacked and laid in the stepped grooves; A partition plate is arranged in the step groove along the depth direction of the step groove, and is used to separate the step groove into two symmetrical accommodating cavities; A pressing plate is arranged at one end of the partition away from the cooling medium channel and is used to fix the superconducting tape.

2. The high current carrying TSTC high temperature superconducting cable for fusion according to claim 1, characterized in that: The material of the metal conductor skeleton is copper or aluminum.

3. The high current carrying TSTC high temperature superconducting cable for fusion according to claim 1, characterized in that: The cooling medium channel runs through the axial direction of the metal conductor skeleton, and a coolant is introduced into the cooling medium channel, and the coolant is liquid nitrogen or liquid helium.

4. The high current carrying TSTC high temperature superconducting cable for fusion according to claim 1, characterized in that: The number of the stepped grooves is multiple and evenly distributed in the circumferential direction of the metal conductor skeleton.

5. The high current carrying TSTC high temperature superconducting cable for fusion according to any one of claims 1 to 4, characterized in that: The stepped groove is arranged in a spiral shape along the outer circumference of the metal conductor skeleton, and the inner diameter of the stepped groove increases continuously in a direction away from the cooling medium channel.

6. The high current carrying TSTC high temperature superconducting cable for fusion according to claim 5, characterized in that: The stepped groove includes at least two parallel strip grooves, and the widths of the strip grooves include 4 mm, 6 mm, 8 mm, and 12 mm.

7. The high current carrying TSTC high temperature superconducting cable for fusion according to any one of claims 1 to 4, characterized in that: The materials of the superconducting tape include yttrium barium copper oxide, bismuth strontium calcium copper oxide, and iron-based superconductor.

8. The high current carrying TSTC high temperature superconducting cable for fusion according to any one of claims 1 to 4, characterized in that: The material of the partition is copper or aluminum, and the partition is integrally formed with the metal conductor frame.

9. The high current carrying TSTC high temperature superconducting cable for fusion according to any one of claims 1 to 4, characterized in that: The pressing plate is a spiral plate, a receiving groove is provided on the spiral plate, the receiving groove is filled with superconducting tape, and the spiral plate is detachably connected to the partition plate.

10. The high current carrying TSTC high temperature superconducting cable for fusion according to any one of claims 1 to 4, characterized in that: The pressing plate is a flat spring, the middle of the spring is filled with superconducting tape, and both sides of the spring are connected to the metal conductor skeleton.

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