A low-smoke halogen-free superconducting wire and a manufacturing method thereof

Abstract

The present invention discloses a low-smoke halogen-free superconducting wire and a method for making the same. The low-smoke halogen-free superconducting wire comprises an insulating sheath and a copper conductor wrapped therein. A shielding mesh layer is embedded in the insulating sheath. The axis of the copper conductor has an axial hole in the shape of a regular polygon. A superconductor made of a superconducting material adapted to its shape is inserted in the axial hole. The shielding mesh layer comprises a semiconductor and a connection node. The semiconductors are connected through the connection nodes to form a spatial mesh topological structure. The method for making the low-smoke halogen-free superconducting wire comprises the following steps: the cable material is put into an internal mixer and mixed for 20 minutes; the material is mixed to 140 degrees, and then granulated by a double-stage granulator; the granulation temperature is 130 degrees; the obtained plastic particles are used to make an insulating layer; the copper conductor is covered on the outer periphery of the superconductor, and a silica gel layer, an inner insulating layer, a shielding mesh layer, a waterproof layer and an outer insulating layer are sequentially formed from the inside to the outside to make a superconducting wire. The present invention has the advantages of small size, light weight and large power transmission capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of cable manufacturing, and in particular to a low-smoke halogen-free superconducting wire and a manufacturing method thereof. Background Art

[0002] In the transmission of electricity, the traditional method mainly uses copper as a conductor, taking advantage of copper's high electrical conductivity and corrosion resistance and non-oxidation properties. In some occasions, from generators to transformers, substations to substations, underground substations to urban power grid ports, as well as electroplating plants, power plants, and substations, where large currents need to be transmitted, traditional copper conductors are used as conductors for transmission, which generates large amounts of heat and losses on copper conductors. In order to reduce losses, the cross-sectional area of ​​copper conductors is increased and the resistance of copper conductors is reduced, but this method increases the overall weight of the wires and the manufacturing cost of the wires is high. During the power transmission process, electromagnetic interference is easily generated, which affects power transmission. Summary of the invention

[0003] The purpose of the present invention is to provide a low-smoke halogen-free superconducting wire and a method for making the same, which has the advantages of small size, light weight and large power transmission capacity, and solves the shortcomings of copper conductors in the prior art that they have high losses and are easily interfered with in medium and high voltage power transmission occasions such as power plants and substations.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a low-smoke halogen-free superconducting wire, including an insulating sheath and a copper conductor coated therein, a shielding mesh layer is embedded in the insulating sheath, the axis of the copper conductor has an axial hole in the shape of a regular polygon, a superconductor made of a superconducting material adapted to its shape is passed through the axial hole, the shielding mesh layer includes semiconductors and connecting nodes, and the semiconductors are connected through the connecting nodes to form a spatial mesh topological structure.

[0005] The present invention adopts the above technical scheme. The superconductor can transmit much higher power than conventional cables, and the loss in transmission is very low. It is widely used in occasions of transmitting large currents. The superconductor is arranged at the axis of the copper conductor, and the copper conductor plays a role in protecting the superconductor to avoid damage to the superconductor during wiring. The axial holes of the superconductor and the copper conductor are set as regular polygons. During the wiring process, the superconductor will not rotate along its own axis at the axial hole, thereby improving the stability of the connection. During the transmission process, the shielding mesh layer plays a role in shielding electromagnetic interference, and the mesh topology structure formed by the semiconductor and the connection nodes is used. The semiconductor is formed into a tubular grid and wrapped around the outer periphery of the copper conductor and the superconductor. The semiconductor evenly covers the outer periphery of the copper conductor, so that the corona generated during the power transmission process, the semiconductor acts as a shielding network layer, forms a spatial mesh topological structure, and evens out the uneven electric potential on the surface of the core composed of the copper conductor and the superconductor, prevents the inner shield from being in loose contact with the insulation layer to produce air gaps, inhibits the growth of electrical trees, and reduces the temperature rise of the main insulation through the thermal resistance temperature distribution effect, thereby playing a thermal shielding role; solves the problem of local voltage field strength, avoids the generation of steep voltage gradients locally, and thus prevents breakdown accidents caused by local overvoltage.

[0006] The above-mentioned low-smoke halogen-free superconducting wire, the connection node includes carbon nanotubes, a first aluminum sheet and a second aluminum sheet, the first aluminum sheet and the second aluminum sheet are connected to the two ends of the carbon nanotube, the semiconductor is silicon, and multiple semiconductor silicons are connected to the first aluminum sheet and the second aluminum sheet to form a mesh topological structure, so that the shielding mesh layer is enclosed to form a hollow tube, and the shielding mesh layer is embedded in the insulating sheath. The first aluminum sheet and the second aluminum sheet are connected to the two ends of the carbon nanotube to connect the semiconductor, thereby connecting to construct a semiconductor shielding mesh layer with a mesh topological structure. The carbon nanotube, as a conductive nanotube, exhibits high conductivity, so that the semiconductor is in a conductive state when connected to the connection node.

[0007] The low-smoke halogen-free superconducting wire, the carbon nanotubes and the first aluminum sheet and the second aluminum sheet can be connected by conductive silver glue or ultrasonic nano-welding.

[0008] In the above-mentioned low-smoke halogen-free superconducting wire, the cross-sectional area of ​​the superconductor is greater than or equal to the cross-sectional area of ​​the copper conductor. Superconductors are mainly used for power transmission, and copper conductors are wrapped around superconductors to improve the structural strength and protect the superconductors. The cross-sectional area of ​​the superconductor is set to be larger than that of the copper conductor, making the superconducting wire light and low in cost, and having a higher structural strength with the support of the copper conductor.

[0009] In the above-mentioned low-smoke halogen-free superconducting wire, the outer periphery of the copper conductor is also coated with a dense graphene layer. The graphene is coated on the outer periphery of the copper conductor to improve the electrical and thermal conductivity of the copper conductor.

[0010] The above-mentioned low-smoke halogen-free superconducting wire has an insulating sheath composed of a silicone layer, an inner insulating layer, a shielding mesh layer, a waterproof layer and an outer insulating layer from the inside to the outside, wherein the silicone layer is wrapped around the outer periphery of the copper conductor, and the inner insulating layer is wrapped around the outer periphery of the silicone layer, and the inner and outer insulating layers are made of low-smoke halogen-free cable materials. The inner insulating layer is wrapped around the outer periphery of the copper conductor to play an insulating role, the silicone layer has a high thermal conductivity, and conducts the heat generated by the wire core to the outside, the shielding mesh layer plays a role in shielding interference, and the waterproof layer plays a waterproof role to prevent water from penetrating into the wire in the open air and rainy days. The outer insulating layer is further wrapped around the outer periphery of the waterproof layer to play a role in further insulation and high temperature resistance and radiation resistance to prevent aging of the insulating sheath.

[0011] The above-mentioned low-smoke halogen-free superconducting wire and low-smoke halogen-free cable material include 45-65 parts of EVA; 10-20 parts of polyethylene; 10-20 parts of POE; 5-10 parts of compatibilizer; 80-120 parts of flame retardant; 2-5 parts of synergistic flame retardant; 1-5 parts of antioxidant; 2-4 parts of lubricant; 1-3 parts of cross-linking agent; 0.5-3 parts of photoinitiator; 20-50 parts of alumina. The above-mentioned formula is used to prepare the cable material, which solves the problem that the traditional high-temperature resistant low-smoke halogen-free cable material needs to be irradiated by electron beam through special equipment, and the cable material or wire needs to be sent to the irradiation plant for irradiation, which is time-consuming and labor-intensive. In addition, by adding alumina, the heat dissipation performance and fire resistance of the inner and outer insulation layers are improved.

[0012] Another technical solution provided by the present invention is: a method for manufacturing a low-smoke halogen-free superconducting wire, wherein the low-smoke halogen-free superconducting wire is manufactured by the following method:

[0013] The low-smoke halogen-free cable material is put into an internal mixer and mixed for 15-20 minutes; the material is mixed to about 140 degrees and then granulated in a double-stage granulator; the granulation temperature is 110-130 degrees; the obtained plastic particles are used to make an insulating layer; then a copper conductor is coated on the periphery of the superconductor, a graphene layer is coated on the periphery of the copper conductor, and a silicone layer, an inner insulating layer, a shielding mesh layer, a waterproof layer and an outer insulating layer are sequentially coated from the inside to the outside to obtain a superconducting wire.

[0014] The beneficial effects achieved by the present invention are as follows: utilizing the high power transmission characteristic of superconductors, the invention is used for high-power and high-current power transmission, with low loss and low temperature rise, and combined with copper conductors to improve the structural strength of superconductors; in power transmission, utilizing a semiconductor shielding mesh layer to achieve a good shielding effect and anti-interference performance; connecting the semiconductor with a first aluminum sheet and a second aluminum sheet of metal aluminum, and connecting the first aluminum sheet and the second aluminum sheet with carbon nanotubes to construct a shielding mesh with a mesh topology structure, so that the semiconductor is evenly covered on the periphery of the wire core, thereby ensuring its shielding and anti-interference performance; coating the surface of the copper conductor with graphene to improve electrical and thermal conductivity, and to make the surface of the copper conductor more wear-resistant, so that the surface of the copper conductor will not be worn and will be smooth when making wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the cross-sectional structure of a low-smoke halogen-free superconducting wire according to an embodiment of the present invention;

[0016] Figure 2 This is a planar development diagram of a shielding mesh layer of a low-smoke halogen-free superconducting wire according to an embodiment of the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of the connection nodes in the shielding network layer;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of a copper conductor and a superconductor in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Embodiment 1

[0020] Reference Figure 1-4 As shown, a low-smoke halogen-free superconducting wire comprises an insulating sheath 1 and a copper conductor 2 wrapped therein, a shielding mesh layer 3 is embedded in the insulating sheath 1, the axis of the copper conductor 2 has an axial hole in the shape of a regular polygon, a superconductor 4 made of a superconducting material adapted to its shape is passed through the axial hole, and the shielding mesh layer 3 comprises a semiconductor 31 and a connection node 32, and the semiconductor 31 is connected through the connection node 32 to form a spatial mesh topological structure. In the production, a superconductor 3 of a certain shape can be produced first, and then the copper conductor 2 is covered on the surface of the superconductor 3 to obtain a wire core composed of the superconductor 4 and the copper conductor 2. When the copper conductor 2 covers the outer periphery of the superconductor 4, the superconductor 4 of a certain shape can be placed in the mold cavity, and then the liquid copper conductor 2 is poured, and after molding, a wire core wrapped by the superconductor 3 is obtained.

[0021] The connection node 32 includes a carbon nanotube 323, a first aluminum sheet 321, and a second aluminum sheet 322. The first aluminum sheet 321 and the second aluminum sheet 322 are connected to both ends of the carbon nanotube 323. The semiconductor is silicon. A plurality of semiconductor silicons are connected to the first aluminum sheet 321 and the second aluminum sheet 322 to form a mesh topological structure, so that the shielding mesh layer 3 is enclosed to form a hollow tube, and the shielding mesh layer 3 is embedded in the insulating sheath 1. Among them, the carbon nanotube 323 has excellent elasticity, so that the shielding mesh layer 3 can be stretched. The semiconductor 31 is connected to the first aluminum sheet 321 and the second aluminum sheet 322 respectively. The first aluminum sheet 321 and the second aluminum sheet 322 are connected through the carbon nanotube 321. The connection node 32 has a high conductivity, which ensures that the semiconductor 31 can be turned on when connected to the connection node 32, and plays a shielding role. The semiconductor 31 is made of silicon material and connected at the connection node 32 to form a mesh topological structure, and the interior is hollow and tubular, embedded in the insulating sheath 1, and the copper conductor 2 and the superconductor 4 are wrapped in the hollow tubular structure of the shielding mesh layer 3, so that the shielding mesh layer 3 can evenly cover the outer periphery of the copper conductor 2 and the superconductor 4, achieving a good shielding effect. The carbon nanotube 323 and the first aluminum sheet 321 and the second aluminum sheet 322 can be connected by conductive silver glue or ultrasonic nano welding.

[0022] In other embodiments, the semiconductor 31 and the connection node 32 may also be connected to form a topological structure in a tree shape, a star shape, a ring shape, etc. The purpose is to improve the shielding effect and enhance the anti-interference ability.

[0023] like Figure 4 As shown, the cross-sectional area of ​​the superconductor 4 is greater than or equal to the cross-sectional area of ​​the copper conductor 2. Among them, the cross-sectional area of ​​the superconductor 4 is approximately equal to the cross-sectional area of ​​the axial hole in the copper conductor 2, and the cross-sectional area S1 of the copper conductor 2 is the cross-sectional area of ​​the portion of the copper conductor 2 after the axial hole is removed from the copper conductor 2 as a whole. The cross-sectional area S2 of the superconductor 4 is set to be greater than or equal to the cross-sectional area of ​​the copper conductor 2, and the superconductor 4 is used as the main power transmission. The power loss during transmission is very small. Since the mechanical properties of the superconductor itself are general, in order to improve the structural stability of the wire, the copper conductor 2 is wrapped around the outer periphery of the superconductor 4, which greatly improves the stability of the overall structure of the wire. Compared with traditional copper cables, this superconducting wire has the advantages of light weight, strong power transmission capacity, and low power loss compared to copper cables with the sum of the cross-sectional areas of the superconductor 4 and the copper conductor 2.

[0024] The outer periphery of the copper conductor 2 is also coated with a dense graphene layer 21. Graphene is a two-dimensional material composed of a single layer of carbon atoms, which has extremely high electrical conductivity and thermal conductivity. When graphene is coated on a conductor, the electrical conductivity of the conductor can be significantly improved. The addition of graphene increases the electron transmission path of the conductor and increases the number and movement speed of carriers. The high thermal conductivity of graphene helps to improve the heat dissipation performance of the conductor and effectively conducts the heat in the wire to the outside of the wire. Graphene is coated on the copper conductor 2, and the surface of the copper conductor 2 is covered by the graphene layer 21. The graphene layer 21 is placed between the copper conductor 2 and the thermally conductive insulating layer, and the combined effect makes the superconducting effect of the wire better.

[0025] The insulating sheath 1 is composed of a silicone layer 11, an inner insulating layer 12, a shielding mesh layer 3, a waterproof layer 13 and an outer insulating layer 14 from the inside to the outside, wherein the silicone layer 11 is wrapped around the outer periphery of the copper conductor 2, the inner insulating layer 12 is wrapped around the outer periphery of the silicone layer 11, and the inner and outer insulating layers 12 and 14 are made of low-smoke halogen-free cable material. Among them, the silicone layer 11 is composed of silicone with thermal conductive powder added, and has good thermal conductivity. In high-power and high-current transmission, when the current flows through the copper conductor 2, a certain amount of heat will be generated. Through the good thermal conductivity of the silicone layer 11, the heat is conducted to the outside of the insulating sheath 1 to avoid heat accumulation. The inner insulating layer 12 and the outer insulating layer 14 play an insulating effect, and the waterproof layer 13 has a dense structure and good waterproof performance.

[0026] The low-smoke halogen-free cable material includes 45-65 parts of EVA, 10-20 parts of polyethylene, 10-20 parts of POE, 5-10 parts of compatibilizer, 80-120 parts of flame retardant, 2-5 parts of synergistic flame retardant, 1-5 parts of antioxidant, 2-4 parts of lubricant, 1-3 parts of cross-linking agent, 0.5-3 parts of photoinitiator and 20-50 parts of alumina.

[0027] The use of the above formula to prepare cable materials solves the problem that traditional high-temperature resistant, low-smoke, halogen-free cable materials need to be irradiated with electron beams through special equipment, and the cable materials or wires need to be sent to the irradiation plant for irradiation, which is time-consuming and labor-intensive. In addition, by adding alumina, the heat dissipation and fire resistance of the inner and outer insulation layers are improved. By adding photoinitiators, the finished cable materials can be cross-linked through ultraviolet light equipment to improve the temperature resistance of the product, and there is no need to send them to the irradiation plant for irradiation to incur additional costs and waste time. Among them, when performing ultraviolet light cross-linking, in addition to black cable materials, light-colored or natural-colored cable materials are also cross-linked by ultraviolet light to improve the temperature resistance of the product. Embodiment 2

[0028] The embodiment of the present invention further discloses a method for manufacturing a low-smoke halogen-free superconducting wire. The low-smoke halogen-free superconducting wire is manufactured by the following method:

[0029] The low-smoke halogen-free cable material is put into an internal mixer and mixed for 15-20 minutes; the temperature is mixed to about 140 degrees, and then granulated by a double-stage granulator; the granulation temperature is 110-130 degrees; the obtained plastic particles are used to make an insulating layer; then the copper conductor 2 is coated on the periphery of the superconductor 4, and the graphene layer 21 is coated on the periphery of the copper conductor 2, and the silicone layer 11, the inner insulating layer 12, the shielding mesh layer 3, the waterproof layer 13 and the outer insulating layer 14 are sequentially coated from the inside to the outside to obtain a superconducting wire.

[0030] After the wire core composed of the copper conductor 2 and the superconductor 4 is manufactured, the outer periphery of the copper conductor 2 is covered with a graphene layer 21, a silicone layer 11, an inner insulating layer 12, a shielding mesh layer 3, a waterproof layer 13 and an outer insulating layer 14 in sequence, thereby obtaining the desired low-smoke halogen-free superconducting wire.

[0031] Comparative Example 1

[0032] EVA, 50 parts; polyethylene, 10 parts; POE, 30 parts; compatibilizer, 10 parts; flame retardant aluminum hydroxide, 50 parts; flame retardant magnesium hydroxide, 60 parts; montmorillonite, 0 parts; MCA, 5 parts; organic aluminum hypophosphite, 0 parts; initiator BP, 1 part; initiator 1173, 0 parts; initiator 184, 0 parts; crosslinking agent, 1 part; silicone masterbatch, 3 parts; antioxidant, 3 parts; anti-UV red toner, 1 part.

[0033] Comparative Example 2

[0034] EVA, 55 parts; polyethylene, 10 parts; POE, 20 parts; compatibilizer, 10 parts; flame retardant aluminum hydroxide, 70 parts; flame retardant magnesium hydroxide, 30 parts; montmorillonite, 0 parts; MCA, 0 parts; organic hypophosphite aluminum, 0 parts; initiator BP, 0.5 parts; initiator 1173, 0.5 parts; initiator 184, 0 parts; crosslinking agent, 1 part; silicone masterbatch, 3 parts; antioxidant, 3 parts; anti-UV red toner, 1 part. Embodiment 3

[0035] EVA, 45 parts; polyethylene, 10 parts; POE, 30 parts; compatibilizer, 10 parts; flame retardant aluminum hydroxide, 30 parts; flame retardant magnesium hydroxide, 70 parts; montmorillonite, 5 parts; MCA, 0 parts; organic aluminum hypophosphite, 0 parts; initiator BP, 0.5 parts; initiator 1173, 0.5 parts; initiator 184, 0 parts; crosslinking agent, 1 part; silicone masterbatch, 3 parts; antioxidant, 3 parts; anti-UV red color powder, 1 part; alumina, 20 parts. Embodiment 4

[0036] EVA, 50 parts; polyethylene, 20 parts; POE, 20 parts; compatibilizer, 10 parts; flame retardant aluminum hydroxide, 40 parts; flame retardant magnesium hydroxide, 60 parts; montmorillonite, 2 parts; MCA, 3 parts; organic aluminum hypophosphite, 0 parts; initiator BP, 0.5 parts; initiator 1173, 0.5 parts; initiator 184, 0 parts; crosslinking agent, 1 part; silicone masterbatch, 3 parts; antioxidant, 3 parts; anti-UV red color powder, 1 part; alumina, 32 parts. Embodiment 5

[0037] EVA, 60 parts; polyethylene, 20 parts; POE, 10 parts; compatibilizer, 10 parts; flame retardant aluminum hydroxide, 50 parts; flame retardant magnesium hydroxide, 50 parts; montmorillonite, 0 parts; MCA, 8 parts; organic aluminum hypophosphite, 0 parts; initiator BP, 0 parts; initiator 1173, 0.5 parts; initiator 184, 0.5 parts; crosslinking agent, 1 part; silicone masterbatch, 3 parts; antioxidant, 3 parts; anti-UV red color powder, 1 part; alumina, 40 parts. Embodiment 6

[0038] EVA, 60 parts; polyethylene, 20 parts; POE, 10 parts; compatibilizer, 10 parts; flame retardant aluminum hydroxide, 65 parts; flame retardant magnesium hydroxide, 35 parts; montmorillonite, 3 parts; MCA, 0 parts; organic aluminum hypophosphite, 2 parts; initiator BP, 0 parts; initiator 1173, 0.5 parts; initiator 184, 0.5 parts; crosslinking agent, 1 part; silicone masterbatch, 3 parts; antioxidant, 3 parts; anti-UV red color powder, 1 part; alumina, 50 parts.

[0039] In summary, the present invention has been made into actual samples and tested for multiple times as described in the specification and the drawings. From the results of the test, it can be proved that the present invention can achieve its intended purpose, and its practical value is beyond doubt. The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention in any form. Any person with ordinary knowledge in the technical field, if it does not depart from the scope of the technical features of the present invention, uses the equivalent embodiments of the technical content disclosed by the present invention to make partial changes or modifications, and does not depart from the technical features of the present invention, all still fall within the scope of the technical features of the present invention.

Claims

1. A low-smoke halogen-free superconducting wire, characterized in that: It is used in situations where large current needs to be transmitted on a large scale, from generator to transformer, from substation to substation, and includes an insulating sheath and a copper conductor wrapped therein, wherein a shielding mesh layer is embedded in the insulating sheath, and the axis of the copper conductor has an axial hole in the shape of a regular polygon, and a superconductor made of a superconducting material that matches its shape is penetrated in the axial hole, wherein the superconductor is a solid structure and is penetrated in the axial hole of the copper conductor; The shielding mesh layer includes semiconductors and connection nodes, and the semiconductors are connected through the connection nodes to form a spatial mesh topological structure; the connection nodes include carbon nanotubes, a first aluminum sheet and a second aluminum sheet, and the first aluminum sheet and the second aluminum sheet are connected to the two ends of the carbon nanotubes. The semiconductor is silicon, and multiple semiconductor silicons are connected to the first aluminum sheet and the second aluminum sheet to form a mesh topological structure, so that the shielding mesh layer is enclosed to form a hollow tube, and the shielding mesh layer is embedded in the insulating sheath.

2. The low-smoke halogen-free superconducting wire according to claim 1, characterized in that: The carbon nanotubes and the first aluminum sheet and the second aluminum sheet can be connected by conductive silver glue or ultrasonic nano-welding.

3. The low-smoke halogen-free superconducting wire according to claim 1, characterized in that: The cross-sectional area of ​​a superconductor is greater than or equal to that of a copper conductor.

4. The low-smoke halogen-free superconducting wire according to claim 1, characterized in that: The outer periphery of the copper conductor is also coated with a dense graphene layer.

5. The low-smoke halogen-free superconducting wire according to any one of claims 1 to 4, characterized in that: The insulating sheath is composed of a silicone layer, an inner insulating layer, a shielding mesh layer, a waterproof layer and an outer insulating layer from the inside to the outside, wherein the silicone layer is wrapped around the outer periphery of the copper conductor, the inner insulating layer is wrapped around the outer periphery of the silicone layer, and the inner and outer insulating layers are made of low-smoke halogen-free cable materials.

6. The low-smoke halogen-free superconducting wire according to claim 5, characterized in that: The low-smoke halogen-free cable material comprises 45-65 parts of EVA, 10-20 parts of polyethylene, 10-20 parts of POE, 5-10 parts of compatibilizer, 80-120 parts of flame retardant, 2-5 parts of synergistic flame retardant, 1-5 parts of antioxidant, 2-4 parts of lubricant, 1-3 parts of crosslinking agent, 0.5-3 parts of photoinitiator and 20-50 parts of aluminum oxide.

7. A method for producing a low-smoke halogen-free superconducting wire, characterized in that: The low-smoke halogen-free superconducting wire according to claim 6 is prepared by the following method: The low-smoke halogen-free cable material is put into an internal mixer and mixed for 15-20 minutes; the material is mixed to about 140 degrees and then granulated in a double-stage granulator; the granulation temperature is 110-130 degrees; the obtained plastic particles are used to make an insulating layer; then a copper conductor is coated on the periphery of the superconductor, a graphene layer is coated on the periphery of the copper conductor, and a silicone layer, an inner insulating layer, a shielding mesh layer, a waterproof layer and an outer insulating layer are sequentially coated from the inside to the outside to obtain a superconducting wire.

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