Graphene composite superconducting cable and method for manufacturing the same

Abstract

The application relates to the field of cable preparation, in particular to a graphene composite superconducting cable and a preparation method thereof. The cable comprises a plurality of cable core units and a filling layer. The side surfaces of the plurality of cable core units abut against each other. The filling layer is wrapped around the plurality of cable core units and filled in the space surrounded by the plurality of cable core units. The cable core unit comprises, from inside to outside, a conductor, a graphene plating layer and an insulating layer. A groove is arranged on the outer wall of the insulating layer. The filling layer extends into the groove. The preparation steps comprise the following steps: S1, preparing the cable core unit; S2, cutting the groove on the outer wall of the cable core unit; S3, feeding the cable core unit into a mold cylinder, injecting glue liquid into the mold cylinder, and feeding the glue liquid into the groove. After the glue liquid is condensed, the mold is taken out. The glue liquid forms the filling layer around the cable core unit after being condensed. Through the application, the problem of noise increase caused by the axial displacement friction of the cable core unit is solved, the noise is reduced, and the performance is stable.

Description

Technical Field

[0001] This invention relates to the field of cables and cable manufacturing, specifically to a graphene composite superconducting cable and its manufacturing method. Background Technology

[0002] Combination Figure 1 As shown, this is an existing graphene composite superconducting cable, comprising a conductor 1, a graphene coating 2, an insulation layer 3, a filler layer 7, a wrapping tape 4, an inner sheath 5, and a sheath 6. The conductor 1, graphene coating 2, and insulation layer 3 together form the cable core unit 23. By setting the graphene coating 2 on the conductor 1, compared to ordinary cables 24, the high electron mobility of the graphene coating 2 effectively improves the power transmission performance and current carrying capacity of the cable 24, resulting in a significantly higher conductivity than ordinary cables 24.

[0003] However, when graphene coating is applied, the cable's conductivity is significantly improved. This leads to faster current and charge transfer on the conductor and graphene coating, resulting in more active current and charge movement. The increased vibration of the conductor and graphene coating due to this movement further intensifies the vibration of the insulation layer and the entire cable core unit. When the cable core unit vibrates axially, significant displacement friction occurs between adjacent core units and between the core unit and the filler layer. This axial friction increases noise, hindering noise reduction and impacting the cable's performance stability in modern signal measurement and control technologies, such as aerospace, nuclear power, navigation and guidance, medical, and industrial automation. Summary of the Invention

[0004] The present invention aims to provide a graphene composite superconducting cable and its preparation method to solve the problem of increased noise caused by axial displacement friction of the cable core unit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a graphene composite superconducting cable, comprising multiple core units and a filling layer, wherein the sides of the multiple core units abut against each other, the filling layer surrounds the multiple core units and fills the space surrounded by the multiple core units, and the core unit comprises a conductor, a graphene coating and an insulation layer from the inside to the outside, and the outer wall of the insulation layer is provided with a groove, the filling layer extending into the groove.

[0006] The principle and advantages of this solution are as follows: The filling layer in this solution fills the space around multiple cable core units and within the space surrounded by these units, making the cable interior more compact and structurally stable. Because the outer wall of the insulation layer has grooves, the filling layer extends into these grooves as it fills the space around the cable core units. This interlocking action of the filling layer and grooves provides axial fixation and positioning for the cable core units. This prevents relative movement between adjacent cable core units and between the cable core units and the filling layer, thus avoiding friction and noise caused by relative movement. This solution addresses the problem of increased vibration associated with graphene coatings on current cables, and improves the performance stability of cables in modern signal measurement and control technologies such as aerospace, nuclear power, navigation and guidance, medical, and industrial automation.

[0007] Preferably, as an improvement, the groove is located at the point where the insulation layers of two adjacent cable core units abut each other, and the filling layer is integrally filled in the space surrounded by multiple cable core units, around the outside of the cable core units, and in the groove.

[0008] The filler layer is formed by the solidification of PP material adhesive. However, in the existing technology, after the cable core unit enters the mold cylinder, the insulation layers of two adjacent cable core units are tightly pressed together. This causes the space surrounded by multiple cable core units to be separated from the outside. When the adhesive is filled, it is injected from the outside into the space surrounded by multiple cable core units. The tightly pressed part of the insulation layers of two adjacent cable core units has a certain obstruction effect on the adhesive entering the space surrounded by multiple cable core units. This makes it difficult for the adhesive to quickly enter the space surrounded by multiple cable core units from the outside. The speed at which the adhesive fills the space surrounded by multiple cable core units is slow, which greatly affects the production efficiency.

[0009] In this design, the groove is located at the point where the insulation layers of two adjacent cable core units meet. When the cable core units enter the mold cylinder, the groove at the point where the insulation layers of adjacent cable core units meet serves as a channel for the adhesive to enter the space surrounded by multiple cable core units from the outside. This accelerates the speed at which the adhesive enters the space surrounded by multiple cable core units, greatly shortening the time it takes for the adhesive to fill the space surrounded by multiple cable core units from the outside and improving production efficiency.

[0010] Preferably, as an improvement, the grooves on the insulation layers of two adjacent cable core units are opposite each other, and the area of ​​the bottoms of the two opposite grooves overlapping is 80-100% of the area of ​​the bottom of a single groove. Thus, by making the two grooves on the insulation layers of two adjacent cable core units opposite each other, the space for adhesive flow can be increased, and the adhesive can enter the space surrounded by multiple cable core units at a faster speed.

[0011] The greater the proportion of the overlapping area of ​​the bottoms of the two grooves to the bottom area of ​​a single groove, the greater the relative degree of the two grooves. This results in a larger space for the adhesive to flow, which is beneficial for the adhesive to flow in the space formed by the two grooves and allows the adhesive to flow faster.

[0012] Preferably, as an improvement, the depth of the groove is 1-3 mm.

[0013] Preferably, as an improvement, the width of the groove is 0.5-3mm.

[0014] To achieve the above objectives, the present invention also adopts the following technical solution: a method for preparing a graphene composite superconducting cable, comprising the following steps: S1. Prepare the cable core unit; S2. Cut a groove on the outer wall of the cable core unit; S3. Insert the cable core unit into the mold cylinder and inject adhesive into the mold cylinder. The adhesive enters the groove and is removed from the mold after it has solidified. After the adhesive has solidified, a filling layer is formed around the cable core unit. S4. Wrap a strap around the outer surface of the filler layer; cover the outer surface of the strap with an inner protective layer; wrap a sheath around the outer surface of the inner protective layer.

[0015] Therefore, in S3, the filling layer is formed in the mold cylinder. The cable core unit with grooves is fed into the mold cylinder, and then adhesive is injected into the mold cylinder. The flowing adhesive enters the grooves, and when the adhesive solidifies, it forms the filling layer. The adhesive in the grooves automatically hardens and abuts against the inner wall of the grooves, achieving automatic abutment and locking of the filling layer and the grooves together. This method enables the fabrication of the graphene composite superconducting cable of this application. Due to the fluidity of the adhesive, it can automatically flow into the grooves and cool and solidify, resulting in each groove being filled with the filling layer.

[0016] Preferably, as an improvement, S2 is performed on a grooving device located above the mold cylinder, where the cable core unit is cut into a groove from top to bottom by the grooving device and then conveyed into the mold cylinder.

[0017] Therefore, after the cable core unit is prepared, the cable core unit is conveyed from top to bottom. The cable core unit first passes through the grooving device, which cuts grooves on the surface of the insulation layer of the cable core unit. Then the cable core unit is conveyed downward to the mold cylinder for glue injection and condensation operations. The whole process is carried out continuously, resulting in high production efficiency.

[0018] Preferably, as an improvement, the grooving device includes a rotating component and a cutter mounted on the rotating component; In S2, as the cable core unit moves downward, the cutter intermittently cuts the insulation layer, and each time it cuts, the cutter cuts a groove obliquely from top to bottom.

[0019] Thus, the rotating component drives the cutter to rotate. When the cutter contacts the insulation layer, it begins to cut grooves in the insulation layer. When the cutter separates from the insulation layer, one groove is completed. Simultaneously, the cable core unit moves downward. As the cutter rotates, when it contacts the insulation layer again, the next groove is cut in another vertical part of the cable core unit. This process is repeated to sequentially cut multiple grooves on the insulation layer of the cable core unit.

[0020] In this design, the cable core unit moves downwards while the groove is being cut, eliminating the need to stop the core unit for cutting and improving production efficiency. Furthermore, in this design, the cutter cuts the groove diagonally from top to bottom each time, ensuring that the vertical position of the cutter changes downwards as the core unit moves. This avoids the obstruction caused by a fixed vertical position of the cutter, guaranteeing that the vertical movement of the core unit and the cutting of the groove occur simultaneously.

[0021] Preferably, as an improvement, the grooving device includes a cutter holder and multiple cutter groups, the multiple cutter groups being circumferentially evenly arranged on the cutter holder, each cutter group including two cutters; Multiple cable core units surround the cutter frame; one cable core unit corresponds to one cutter group, and the corresponding cable core unit is located on the outer side of the corresponding cutter group; the two cutters on the cutter group cut two longitudinal rows of grooves on the corresponding cable core unit.

[0022] In this scheme, each cutting blade group is used to cut grooves on one cable core unit. Since each cable core unit has two adjacent cable core units, each cable core unit has two contact surfaces that contact the two adjacent cable core units respectively. Therefore, each cutting blade group in this scheme includes two cutting blades, and the two cutting blades cut grooves on the two contact surfaces on the cable core unit respectively, so that two longitudinal rows of grooves can be cut on the cable core unit.

[0023] In this design, multiple cutting blade groups are evenly arranged circumferentially on a cutting blade frame, while multiple cable core units surround the cutting blade frame. The multiple cutting blade groups are located inside the space enclosed by the multiple cable core units. The multiple cutting blade groups are close to each other, resulting in a compact structure that facilitates driving with a single power drive device. This arrangement also allows the multiple cutting blade groups to cut two rows of grooves on their respective cable core units. After the cable core units move into the mold cylinder, they are close together, and the grooves on adjacent cable core units automatically align to form a large adhesive flow space, eliminating the need for adjusting the position of the cable core units.

[0024] Preferably, as an improvement, the adhesive is radially introduced into the mold cylinder; a condenser is provided on the side wall of the mold cylinder. Thus, the condenser cools and condenses the adhesive, which facilitates rapid solidification of the adhesive to form a filling layer. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of a graphene composite superconducting cable in the prior art.

[0026] Figure 2 This is a cross-sectional view of the graphene composite superconducting cable in this embodiment.

[0027] Figure 3 This is a schematic diagram of the machining of the cable core unit in the grooving device and the mold cylinder.

[0028] Figure 4 A three-dimensional schematic diagram showing multiple cutting blade groups cutting grooves into corresponding cable core units.

[0029] Figure 5 A schematic diagram of two cutters on a cutter set cutting a groove in a cable core unit.

[0030] Figure 6 This is a top sectional view of the cable core unit inside the mold cylinder. Detailed Implementation

[0031] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: conductor 1, graphene coating 2, insulating layer 3, wrapping tape 4, inner sheath 5, sheath 6, filling layer 7, groove 8, extension 9, cutter holder 10, output shaft 11, first belt groove 12, bevel gear 13, drive shaft 14, second belt groove 15, drive motor 16, rotating component 17, cutter 18, grooving cylinder 19, mold cylinder 20, glue injection tube 21, condenser 22, cable core unit 23, cable 24.

[0032] The basic implementation examples are as follows: Figures 2-6The diagram shows a graphene composite superconducting cable, comprising multiple core units 23 and a filling layer 7. In this embodiment, there are three core units 23, but in other embodiments, there can be four, five, or six, etc. Each core unit 23, from the inside out, includes a conductor 1, a graphene coating 2, and an insulation layer 3. In this embodiment, the conductor 1 is made of copper alloy, and the insulation layer 3 is made of polyolefin. The graphene coating 2 is a conductive coating applied to the conductor 1. The raw materials and preparation method of the conductive coating can be found in Chinese Patent Publication No. CN110299229A, which discloses a graphene-coated superconducting core building environmentally friendly cable 24, and will not be repeated here.

[0033] In this embodiment, the sides of multiple cable core units 23 abut against each other. The filling layer 7 surrounds the multiple cable core units 23 and fills the space surrounded by the multiple cable core units 23. The outer wall of the insulation layer 3 is provided with a groove 8, and the filling layer 7 extends into the groove 8. The part of the filling layer 7 that extends into the groove 8 is the extension 9. Thus, the extension 9 of the filling layer 7 abuts against and engages with the groove 8, so that the filling layer 7 can play a role in axially fixing and positioning the cable core units 23. Adjacent cable core units 23 are less likely to move relative to each other in the axial direction, and the cable core units 23 and the filling layer 7 are also less likely to move relative to each other in the axial direction. This avoids the generation of large noise due to relative movement, which is beneficial to the noise reduction of the cable 24. It solves the problem of increased vibration caused by the graphene coating 2 on the current cable 24, and is conducive to improving the performance stability of the cable 24 in modern signal measurement and control technology, such as aerospace, nuclear power, navigation and guidance, medical, industrial control automation and other fields.

[0034] In addition, the filling layer 7 is made of PP material adhesive solidified. When multiple cable core units 23 are pressed together, the adhesive is not easy to enter the space enclosed by the multiple cable core units 23 from the outside. Therefore, in this embodiment, the groove 8 is located at the part where the insulation layers 3 of two adjacent cable core units 23 are pressed together. In this way, when the adhesive enters the space enclosed by the multiple cable core units 23 from the outside, the groove 8 can serve as a space for the liquid to flow from the outside to the inside, thereby facilitating the entry of the adhesive into the space enclosed by the multiple cable core units 23.

[0035] Furthermore, to maximize the liquid flow space provided by the grooves 8, in this embodiment, the two grooves 8 on the abutting portions of the insulation layers 3 of two adjacent cable core units 23 are aligned. Naturally, the greater the overlap between the two grooves 8, the larger the space formed by the two grooves 8, resulting in better liquid flow speed and throughput. Further, the overlapping area of ​​the bottoms of the two grooves 8 is 80-100% of the bottom area of ​​a single groove 8. Within this range, the degree of overlap between the two grooves 8 is relatively large, preferably 100%. At 100%, the two grooves 8 have the same shape, size, and orientation, and their bottoms are completely aligned, maximizing the liquid flow space formed by the combined grooves 8. In this embodiment, the depth of a single groove 8 is 1-3 mm. The width of the groove 8 is 0.5-3 mm. The specific width and depth of the groove 8 are determined according to the specifications of the cutter 18.

[0036] In addition, the cable 24 in this embodiment also includes a wrapping tape 4 located outside the filling layer 7. The outer side of the wrapping tape 4 is provided with an inner sheath 5 made of PE material, and the outer side of the inner sheath 5 is provided with a sheath 6 made of polyolefin material.

[0037] In addition, this embodiment also discloses a method for preparing a graphene composite superconducting cable 24, including the following steps: S1. Preparation of cable core unit 23. Specifically, a conductive coating is applied to the outer surface of the copper alloy conductor 1, and after the conductive coating dries, a graphene coating 2 is formed; then the graphene coating 2 and the insulating layer 3 are extruded in sequence to obtain the cable core unit 23. The preparation of the cable core unit 23 is existing technology and is not an improvement of this application, so it will not be described in detail here.

[0038] S2. Cut a groove 8 on the outer wall of the cable core unit 23. This step is performed on the grooving device, combined with... Figures 3-5 As shown, the grooving device in this embodiment includes a grooving cylinder 19, a cutter holder 10, and multiple cutter assemblies located on the cutter holder 10. In this embodiment, there are three cutter assemblies, each including two rotating parts 17 and a cutter 18 mounted on the rotating parts 17. The rotating parts 17 are inclined discs, and each rotating part 17 is coaxially fixedly connected to a drive shaft 14 via a pin or key. The drive shaft 14 is rotatably connected to the cutter holder 10 via bearings. The rotating parts 17 are located below the cutter holder 10, and the top end of the drive shaft 14 is located above the cutter holder 10. A bevel gear 13 is coaxially fixed to the top end of the drive shaft 14. The bevel gears 13 on the two drive shafts 14 of each cutter assembly approach and mesh with each other, while the rotating parts 17 at the bottom ends of the two drive shafts 14 are far apart. In this embodiment, the cutter 18 is an arc-shaped blade, and the rotating parts 17 have a blade placement groove, in which the blade is fixed by screws. Because the rotating part 17 is tilted, the cutter 18 is also tilted.

[0039] A drive motor 16 is located in the middle of the cutter holder 10. The output shaft 11 of the drive motor 16 has multiple first belt grooves 12. One drive shaft 14 in each cutter assembly has a second belt groove 15. A belt connects the drive shaft 14 with the second belt groove 15 to the output shaft 11 (the three drive shafts 14 are connected to the output shaft 11 via three belts). The drive motor 16 drives the corresponding drive shaft 14 to rotate via the belts, thereby driving the three drive shafts 14 with the first belt grooves 12 in the three cutter assemblies to rotate. Each drive shaft 14 then drives another drive shaft 14 to rotate through the meshing of a bevel gear 13, thus realizing the rotation of two rotating components 17 in one cutter assembly. These two rotating components 17 drive the corresponding cutter 18 to rotate. Through the structural arrangement in this embodiment, the three cutter assemblies are compact, and a single drive motor 16 can simultaneously drive the three cutter assemblies (six rotating components 17) to rotate.

[0040] Combination Figure 3 and Figure 4 As shown, in this embodiment, three cable core units 23 pass vertically through the grooving cylinder 19, surrounding the cutter frame 10. Each cable core unit 23 corresponds to one cutter group, and the corresponding cable core unit 23 is located on the outer side of the corresponding cutter group. Thus, the two cutters 18 on each cutter group cut two grooves 8 on the cable core unit 23 each time. As the cable core unit 23 moves downward, each cutter group can cut two rows of grooves 8 on the corresponding cable core unit 23. To ensure that the cable core unit 23 does not change its position when moving vertically downward in the grooving cylinder 19, and to ensure that the position of the cable core unit 23 and the cutter group is relatively fixed in the lateral direction, the inner wall of the grooving cylinder 19 is provided with three vertical limiting grooves that match the shape of the outer wall of the cable core unit. The three limiting grooves are respectively opposite to the three cutter groups. Thus, the cable core unit 23 moves in the vertical limiting grooves without lateral displacement, and the vertical movement is relatively stable.

[0041] Thus, after the three cable core units 23 in this step are prepared, they enter the grooving cylinder 19 and move downwards. Simultaneously, as the cable core units 23 move downwards, the drive motor 16 drives the three drive shafts 14 on the three cutting blade groups to rotate via belts. The belt-driven drive shaft 14 then drives another drive shaft 14 to rotate via bevel gears 13. In this way, all six drive shafts 14 can rotate simultaneously, driving six rotating components 17 to rotate. The six rotating components 17 drive six cutting blades 18 to rotate, and the six cutting blades 18 respectively cut six grooves 8 on the three cable core units 23. During the rotation of the rotating component 17, the cutter 18 does not remain in constant contact with the insulation layer 3 of the cable core unit 23, but rather makes intermittent contact to cut grooves. Because the rotating component 17 is tilted, when the cutter 18 rotates and contacts the cable core unit 23, the cutter 18 is positioned above, intermittently cutting the insulation layer 3. Then, the cutter 18 cuts grooves 8 diagonally downwards. After separating from the insulation layer 3, the cutter 18 is positioned below. As the cutter 18 continues to rotate upwards and the cable core unit 23 moves downwards, it cuts grooves 8 in other vertical locations on the cable core unit 23. Since the cutter 18 rotates diagonally from top to bottom, it has a downward component in the vertical direction. Therefore, as the cable core unit 23 moves downwards, the cutter 18 also moves downwards when cutting the cable core unit 23, thus not hindering or affecting its downward movement.

[0042] Thus, through this step, grooves 8 are cut into three cable core units 23, with two grooves 8 on each cable core unit 23, and the grooves 8 on two adjacent cable core units 23 are opposite each other.

[0043] S3, Combination Figure 3 and Figure 6 As shown, after the cable core unit 23 exits from the grooving cylinder 19, it enters the mold cylinder 20 located below the grooving cylinder 19. The diameter of the mold cylinder 20 is smaller than the diameter of the grooving cylinder 19. Therefore, after the three cable core units 23 enter the mold cylinder 20, they come together and are pressed tightly against each other. Since the grooves 8 cut on adjacent cable core units 23 are opposite each other in S2, after the three cable core units 23 approach and abut against each other, the grooves 8 on the contact surfaces of adjacent cable core units 23 are aligned.

[0044] The outer wall of the mold cylinder 20 is provided with an injection tube 21. The adhesive enters the mold cylinder 20 through the injection tube 21, filling the space between the cable core unit 23 and the inner wall of the mold cylinder 20. At the same time, the adhesive enters the groove 8 and then enters the space enclosed by the three cable core units 23. Thus, the groove 8 facilitates the entry of the adhesive into the space enclosed by the three cable core units 23.

[0045] A condenser 22 is provided on the outer wall of the lower middle part of the mold cylinder 20. Cooling pipes are installed in the condenser 22, and coolant flows through the cooling pipes. When the coolant passes through the condenser 22, it cools the mold cylinder 20, causing the adhesive in the mold cylinder 20 to steadily decrease in temperature and solidify, thus forming a filling layer 7 surrounding the cable core unit 23 and located within the groove 8. The solidified filling layer 7 and the three cable core units 23 then emerge from the bottom of the mold cylinder 20. In this embodiment, the solidified filling layer 7 in the mold cylinder 20 can seal the adhesive injected into the mold cylinder 20, preventing the adhesive from flowing downwards from the bottom of the mold cylinder 20.

[0046] S4. After the cable core unit 23 and the filling layer 7 come out of the mold cylinder 20, wrapping tape 4 is wrapped around the outer surface of the filling layer 7; the inner sheath 5 is covered on the outer surface of the wrapping tape 4; and the sheath 6 is wrapped around the outer surface of the inner sheath 5. This step is existing technology and will not be described in detail here.

[0047] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for preparing a graphene composite superconducting cable, characterized in that: Includes the following steps: S1. Prepare the cable core unit; S2. Cut a groove on the outer wall of the cable core unit; S3. Insert the cable core unit into the mold cylinder and inject adhesive into the mold cylinder. The adhesive enters the groove and is removed from the mold after it has solidified. After the adhesive has solidified, a filling layer is formed around the cable core unit. S4. Wrap a strap around the outer surface of the filler layer; cover the outer surface of the strap with an inner protective layer; wrap a sheath around the outer surface of the inner protective layer. S2 is performed on the grooving device, which is located above the mold cylinder. The cable core unit is cut into a groove from top to bottom by the grooving device and then conveyed into the mold cylinder. The grooving device includes a rotating component and a cutting blade mounted on the rotating component; In S2, as the cable core unit moves downward, the cutter intermittently cuts the insulation layer, and each time it cuts, the cutter cuts a groove obliquely from top to bottom; The grooving device includes a cutter holder and multiple cutter groups, with the multiple cutter groups evenly arranged circumferentially on the cutter holder, and each cutter group including two cutters. Multiple cable core units surround the cutter frame; One core unit corresponds to one cutter group, and the corresponding core unit is located on the outer side of the corresponding cutter group; the two cutters on the cutter group cut two longitudinal rows of grooves on the corresponding core unit.

2. The method for preparing a graphene composite superconducting cable according to claim 1, characterized in that: The mold cylinder is radially fed with adhesive; a condenser is provided on the side wall of the mold cylinder.

3. A graphene composite superconducting cable prepared according to the method for preparing a graphene composite superconducting cable according to claim 1 or 2, comprising a plurality of cable core units and a filling layer, wherein the sides of the plurality of cable core units abut against each other, the filling layer surrounds the plurality of cable core units and fills the space surrounded by the plurality of cable core units, and the cable core unit comprises, from the inside out, a conductor, a graphene coating and an insulating layer, characterized in that: The outer wall of the insulating layer is provided with a groove, and the filling layer extends into the groove.

4. The graphene composite superconducting cable according to claim 3, characterized in that: The groove is located at the point where the insulation layers of two adjacent cable core units meet. The filling layer is integrally filled within the space surrounded by multiple cable core units, around the outside of the cable core units, and in the groove.

5. A graphene composite superconducting cable according to claim 4, characterized in that: The grooves on the insulation layer of two adjacent cable core units are opposite each other, and the area of ​​the bottom of the two opposite grooves overlapping is 80-100% of the area of ​​the bottom of a single groove.

6. A graphene composite superconducting cable according to any one of claims 3-5, characterized in that: The depth of the groove is 1-3mm.

7. A graphene composite superconducting cable according to any one of claims 3-5, characterized in that: The width of the groove is 0.5-3mm.

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