Oxidic conductor and process for its production

Abstract

The embodiment of the present application belongs to the technical field of cable conductors, and particularly relates to an oxidized conductor and a production process thereof, which comprises the following steps: copper wire drawing, spraying a strong oxidant solution, copper single wire annealing, center filling core stranding, segmented strand conductor stranding, cabling and covering a semi-conductive tape. A mixed strong oxidant solution of sodium hydroxide and ammonium persulfate is sprayed on the surface of the copper single wire, and only a low temperature of 150 DEG C to 200 DEG C is used in annealing, so that the thickness of the oxidized copper film between the surface of the oxidized conductor and the oxidized copper single wire is 2.0 mu m to 3.5 mu m. Meanwhile, because the oxidized copper film is a kind of semi-conductive material, the problems of significant skin effect and increased alternating current resistance of the traditional round conductor under the condition of a large cross section are solved, and the alternating current resistance of the oxidized conductor is reduced by about 20% compared with the traditional round conductor, so that the conductivity of the conductor is improved.

Description

Technical Field

[0001] This invention relates to the field of cable conductor technology, specifically to an oxidized conductor and its manufacturing process. Background Technology

[0002] With the increasing demand for power transmission, large-section conductors, due to their higher current carrying capacity and lower losses, can provide a more stable power supply and more efficient energy transmission, and are increasingly widely used in large-scale power transmission. However, traditional circular conductors suffer from significant skin effect and increased AC resistance under large-section conditions. While conductor segmentation technology can alleviate this problem, it still has the following shortcomings: traditional cable conductors have certain limitations in terms of resistance control and structural stability, making it difficult to meet the demands of high-capacity, low-loss power transmission. In addition, pure copper is prone to heating during high-current transmission, and its resistance increases with temperature, leading to increased energy loss.

[0003] The common solution is to use enameled wire instead of copper wire. However, as a type of electromagnetic wire, enameled wire has a complex production process and high production costs. The insulating varnish used in enameled wire contains volatile organic solvents, which not only pollute the environment, but also reduce the insulation performance under special working conditions such as high temperature and high humidity, affecting the reliability of equipment operation. At the same time, the insulating varnish needs to be removed when welding enameled wire, which is difficult to remove and incomplete removal affects the welding quality. Summary of the Invention

[0004] The purpose of this invention is to provide an oxide conductor and its manufacturing process to solve problems such as the complexity of the copper oxide film manufacturing process and the low production efficiency.

[0005] The oxide conductor in this embodiment of the invention includes a circular compacted conductor and a segmented conductor. To facilitate understanding of the technical solution of this embodiment, a segmented conductor is used as an example to illustrate the technical solution of the invention in detail: In a first aspect, embodiments of the present invention provide a manufacturing process for an oxidized conductor, comprising the following steps: S1. Draw the copper rod into copper single wire; S2. Spray a strong oxidizing agent solution onto the surface of the copper single wire; S3. Anneal the copper wire coated with a strong oxidizing agent solution to obtain copper oxide wire; S4. Twist multiple copper oxide single wires together to form a center filling core; S5. Twist multiple copper oxide single wires into a segmented conductor block; S6. The stranded center filler core and the divided strand conductors are then cabled. S7. After cabling, a semiconducting tape is wrapped around the surface of the conductor to obtain a copper oxide conductor.

[0006] In some other embodiments, in step S1, the diameter of the copper single wire is 2.58mm-2.78mm.

[0007] For example, the diameter of the copper single wire is 2.58mm-2.62mm and 2.74mm-2.78mm.

[0008] Furthermore, the diameters of the copper single wires are 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm, respectively. Among them, the copper single wire with a diameter of 2.60mm-2.61mm serves as the central filling core; the copper single wire with a diameter of 2.77mm-2.78mm serves as the inner layer copper single wire of the segmented strands; and the copper single wire with a diameter of 2.74mm-2.75mm serves as the outer layer copper single wire of the segmented strands.

[0009] The outer layer copper wires of the split strands refer to the copper wires around the fan-shaped perimeter of the split strands, while the inner layer copper wires are used in addition to these outer layer copper wires. The copper wires used in the center filler core have a smaller diameter than those in the split strands, optimizing flexibility, weight reduction, and electrical performance while ensuring basic mechanical functions. The thicker inner layer copper wires of the split strands can directly withstand the tensile load of the conductor and better resist creep deformation caused by long-term mechanical stress. The thinner outer layer copper wires of the split strands improve the cable's bending performance, adapting to bending requirements during laying, and the smoother surface after stranding reduces insulation wear and improves the electric field distribution.

[0010] In some other embodiments, in step S2, the amount of strong oxidant solution sprayed is controlled by adjusting the travel speed of the copper wire, which is 400 m / min to 600 m / min. For example, the travel speeds of the copper wire are 400 m / min, 500 m / min, and 600 m / min.

[0011] It is important to note that during the wire drawing process, the gas protection device in the continuous softening machine built into the wire drawing machine can be omitted. The wire can then be annealed in the continuous softening machine at a voltage of 45V. By spraying a mixed alkaline strong oxidizing agent solution, namely sodium hydroxide and ammonium persulfate solution, onto the surface of the copper wire, the oxidation of the copper wire can be promoted, thus avoiding the conventional process of obtaining a copper oxide film at high temperatures and subsequent complex annealing operations.

[0012] In some other embodiments, in step S2, the strong oxidant solution includes a sodium hydroxide solution and an ammonium persulfate solution, wherein the concentration of the sodium hydroxide solution is 2-3 mol / L, the concentration of the ammonium persulfate solution is 0.1-0.3 mol / L, and the volume ratio of the sodium hydroxide solution to the ammonium persulfate solution is 1:(0.5-1.5).

[0013] For example, the concentrations of sodium hydroxide solution are 2, 2.5, and 3 mol / L, and the concentrations of ammonium persulfate solution are 0.1, 0.2, and 0.3 mol / L, with volume ratios of sodium hydroxide solution to ammonium persulfate solution of 1:0.5, 1:1, and 1:1.5. Within this range, ammonium persulfate exhibits milder oxidizing power under alkaline conditions (pH adjusted with NaOH), generating a more uniform oxide layer (such as CuO), making it suitable for surface treatment.

[0014] In some other embodiments, in step S3, the annealing temperature is 150℃-200℃, the holding time is 3-5h, and the thickness of the copper oxide film in the copper oxide single wire is 2.0μm-3.5μm.

[0015] For example, the annealing temperatures are 150°C, 160°C, 170°C, 180°C, 190°C and 200°C, and the holding times are 3, 4 and 5 hours, respectively, and the thickness of the copper oxide film in the copper oxide single wire is 2.0 μm, 2.5 μm, 3.0 μm and 3.5 μm.

[0016] This annealing process can further oxidize the copper wire to obtain copper oxide wire.

[0017] In some other embodiments, in step S4, the central filling core adopts a 1+6+12 / 2.60mm structure; 1+6+12 / 2.60mm indicates the number of layers or arrangement of the core mold, with 1 center layer, 6 middle layers, and 12 outer layers, and 2.60mm indicates the thickness of each layer or the total thickness of the core mold. A frame stranding machine is used during stranding, and a 630 tooling reel is used for the copper oxide single wire feed. Before the copper oxide single wire is put into production, the stranding machine is changed to use nylon threading nozzles, wire guide rollers, and wire guide rollers inside the stranding body. The stranding speed is 20-30m / min to protect the oxide layer from damage and peeling.

[0018] In some other embodiments, in step S5, the machine speed is controlled at 10-15m / min during stranding; the pitch of the outer single wire is controlled at 360mm-400mm; the cable pitch is controlled at 1770mm-1830mm; and the stranding direction of each single wire is left-handed. The structure of the stranded conductor is 91 / 2.73mm. During stranding, the inner layer uses a fan-shaped die, and the outer layer uses a tile-shaped die. A frame stranding machine is used, and a 630 tooling reel is used for the copper oxide single-wire feed. Before the copper oxide single-wire is put into production, the stranding machine is changed using nylon threading nozzles, wire guide rollers, and wire guide rollers inside the strand to protect the oxide layer from damage and detachment. During take-up, each reel holds a strand, and silicone oil is added during conductor take-up. PE film is used to separate the strands during take-up. When drawing single wires into strands, the inner layer single wire diameter is drawn according to (+0.04, +0.05), and the outer layer single wire diameter is drawn according to (+0.01, +0.02). A special die is used for stranding the strands; the inner layer uses a fan-shaped die, and the outer layer uses a tile-shaped die.

[0019] In some other embodiments, in step S6, the outer diameter of the cable is 60-62mm, and a corrugated paper tape is provided between two adjacent split conductor strands.

[0020] In some other embodiments, in step S7, the semiconducting tape is a Tertonite tape, the overlap rate of the semiconducting tape is 40%-50%, the winding direction is right-handed, and the outer diameter of the conductor after wrapping is 61.5-64 mm.

[0021] In a second aspect, embodiments of the present invention provide an oxide conductor as described in the first aspect and an oxide conductor produced by the same manufacturing process, comprising a wire core and a semiconductive strip covering the surface of the wire core; the wire core comprises a wire core body and a corrugated paper strip, the wire core body comprising a central filling core and a plurality of fan-shaped segmented strands of the same size and cross-sectional shape twisted together on the periphery of the central filling core; the corrugated paper strip is disposed between adjacent segmented strands. The core body is made of copper oxide single wire, which includes copper single wire and copper oxide film covering the surface of copper single wire. The thickness of the copper oxide film is 2.0μm-3.5μm.

[0022] Furthermore, the manufacturing process of this invention is also applicable to the preparation of circular compacted conductors, and the specific process is as follows: S1. Draw the copper rod into copper single wire; S2. Spray a strong oxidizing agent solution onto the surface of the copper single wire; S3. Anneal the copper wire coated with a strong oxidizing agent solution to obtain copper oxide wire; S4. Twist multiple copper oxide single wires into a round compacted conductor; S5. A circular compacted conductor is obtained by wrapping a semiconductive strip around the surface of the circular compacted conductor.

[0023] Beneficial effects of the embodiments of the present invention: (1) The method for preparing the oxide conductor provided in this embodiment of the invention is simple to operate. It involves spraying a strong oxidizing agent solution onto the surface of a copper single wire to oxidize the surface of the copper single wire, and then annealing it to obtain an oxide copper single wire. In the process of preparing the oxide copper conductor, the oxide film formed on the surface of the oxide copper single wire can serve as a semi-conductive material to replace the varnish film on the surface of the copper single wire, separating the individual copper single wires. At the same time, the oxide film can be directly welded, avoiding the difficulties of removing the varnish film before welding traditional enameled wires and the difficulty of removing the insulating varnish. This improves the processing speed of subsequent oxide copper conductor processing, such as the stranding and cabling of the center filling core and the split strand conductors, reduces production costs, and reduces environmental pollution.

[0024] (2) The method for preparing the oxide conductor provided in this embodiment of the invention avoids the conventional method of preparing copper oxide single wire, which requires the preparation of copper oxide film at high temperature and cannot precisely control the thickness of the copper oxide film; it also avoids the existing method of treating the substrate surface with strong oxidant solution (sodium hydroxide and ammonium persulfate) through electrochemical methods or impregnation methods, which is relatively complex, time-consuming and unsuitable for large-scale production applications. The copper oxide single wire of this invention only requires adding a spraying device to the existing copper single wire production process to spray sodium hydroxide and ammonium persulfate in strong oxidant solution onto the surface of copper single wire. Through the synergistic effect of sodium hydroxide and ammonium persulfate, combined with subsequent annealing treatment, the oxidation of copper single wire is promoted, and copper oxide single wire is obtained. The preparation process of the copper oxide single wire of this invention has mild reaction conditions, simple operation, and high production efficiency, and is suitable for industrial promotion and application.

[0025] (3) The copper oxide conductor prepared by the method of the present invention can meet the requirements of high-capacity, low-loss power transmission. The structure of the copper oxide conductor does not contain insulating varnish, the production process is simple, and the production cost is low. In addition, compared with the traditional round conductor, the AC resistance of the copper oxide conductor is reduced by about 20%, which improves the conductivity of the conductor. Attached Figure Description

[0026] The accompanying drawings, which form part of the embodiments of the present invention, are used to provide a further understanding of the embodiments of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the embodiments of the present invention and do not constitute an improper limitation of the embodiments of the present invention.

[0027] Figure 1 This is a schematic diagram of the oxide conductor in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of a single copper oxide line in Embodiment 1 of the present invention; Among them, the central filling core 1, the segmented strands 2, the crepe paper tape 3, the semi-conductive tape 4, the copper single wire 5, and the copper oxide film 6. Detailed Implementation

[0028] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. Specific conditions not specified in the embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Components not specifying their manufacturers are all commercially available conventional products. The copper oxide conductors in the embodiments of the present invention comprise circular compacted conductors or segmented conductors.

[0029] To address the problems of low production efficiency and high cost caused by the high preparation temperature and complex process of copper oxide film in existing copper oxide wires, this invention provides a production process for an oxide conductor, including the following steps: S1. Draw the copper rod into copper single wire; S2. Spray a strong oxidizing agent solution onto the surface of the copper single wire; S3. Anneal the copper wire coated with a strong oxidizing agent solution to obtain copper oxide wire; S4. Twist multiple copper oxide single wires together to form a center filling core; S5. Twist multiple copper oxide single wires into a segmented conductor block; S6. The stranded center filler core and the divided strand conductors are then cabled. S7. After cabling, a semiconducting tape is wrapped around the surface of the conductor to obtain a copper oxide conductor.

[0030] The production process of copper oxide conductors is simple. A strong oxidizing agent solution is sprayed onto the surface of copper single wires to oxidize them. After annealing, copper oxide single wires are obtained. During the preparation of copper oxide conductors, the copper oxide film formed on the surface of the single wires can act as a semi-conductive material, replacing the enamel film on the surface of the copper single wires and separating the individual copper wires. Simultaneously, the copper oxide film can be directly welded, avoiding the difficulties of removing the enamel film and removing the insulating varnish that are inherent in traditional enameled wire welding. This improves the processing speed of subsequent copper oxide conductors, such as the stranding of the center filler core and the split conductor blocks, and the cabling process, while reducing production costs and environmental pollution.

[0031] The oxide conductor obtained through the embodiments of the present invention has a conventional structure, including a wire core and a semiconducting strip covering the surface of the wire core. The wire core includes a wire core body and a corrugated paper strip. The wire core body includes a central filling core and segmented strands. The segmented strands are several fan-shaped structures of the same size and cross-sectional shape, and are twisted together on the cross-section surrounding the central filling core. The corrugated paper strip is disposed between two adjacent segmented strands.

[0032] To facilitate a clearer understanding of the oxide conductor prepared according to the embodiments of the present invention, the attached... Figure 1 For example, the structure of the prepared oxide conductor is explained as follows: from Figure 1 As can be seen, the oxide conductor includes a wire core and a semiconducting strip 4 covering the surface of the wire core. The wire core includes a wire core body and a corrugated paper strip 3. The wire core body includes a central filling core 1 and segmented strands 2. The segmented strands 2 are several fan-shaped structures of the same size and cross-sectional shape, and the corrugated paper strip 3 is placed between two adjacent segmented strands 2. Several segmented strands 2 are twisted together on the cross-section around the central filling core 1.

[0033] For example, the core body includes a central filler core 1 and 5 segmented strands. The central filler core 1 is a 1+6+12 / 2.60mm structure forming a single round copper wire. The diameter of a single copper wire used in the central filler core 1 is 2.60mm-2.61mm, the outer layer pitch is 150mm, and the outer diameter of the central filler core 1 is 11.5mm.

[0034] Segment 2 is a fan-shaped structure with a 91 / 2.73mm diameter. The V-height of segment 2 is 30.6mm, the fan width is 33.9mm, the outer conductor pitch is 380mm, the pre-twist pitch is 1800mm, and the conductor cross-section is 478mm². 2 Among them, the V-height of the segment is a technical parameter for dividing the segment. It is the distance between the outer arc surface of the segment and the bottom of the V-shaped card plate, which is achieved by fastening the V-shaped card plate to the two sides and the inner arc surface of the segment.

[0035] The semi-conductive tape 4 can be made of semi-conductive Tedoron tape. The wrapping overlap rate of the semi-conductive tape 4 is 45%, the outer diameter of the wire core is 61.2 mm, and the outer diameter of the copper oxide conductor after wrapping is 62.7 mm.

[0036] A schematic diagram of the structure of a single copper oxide wire is shown below. Figure 2 As shown. By Figure 2 It is known that the copper oxide single wire includes a copper single wire 5 and a copper oxide film 6. The copper oxide film 6 coats the surface of the copper single wire 5. The copper oxide film 6 prepared through this embodiment of the invention has a thickness of 2.8 μm.

[0037] As can be seen, the embodiments of the present invention provide an oxide conductor and a manufacturing process that solves the problems of low production efficiency and high cost caused by the high preparation temperature and complex preparation process of the copper oxide film in copper oxide wire. At the same time, it reduces the skin effect and AC resistance of large-section conductors, and also solves the problems of complex production process, high production cost, environmental pollution, and difficulty in removing the insulating varnish from enameled wires.

[0038] The following describes in further detail the operation steps and performance of the embodiments of the present invention with reference to the examples: Example 1 A process for producing an oxide conductor includes the following steps: S1. Copper wire drawing: The copper rod is drawn into copper single wire to produce three diameter sizes of copper single wire, namely 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm; among them, the diameter of the copper single wire used for the center filling core is 2.60mm-2.61mm; the diameter of the inner layer copper single wire of the segmented strand 2 is 2.77mm-2.78mm, and the diameter of the outer layer copper single wire of the segmented strand is 2.74mm-2.75mm.

[0039] The outer layer copper wire of the segmented strand refers to the copper wire around the fan-shaped perimeter of the segmented strand. The copper wire used outside the outer layer copper wire of the segmented strand is the inner layer copper wire. It should be noted that during the wire drawing process, the gas protection device in the continuous softening machine of the wire drawing machine can be omitted. The wire can be annealed in the continuous softening machine with an annealing voltage of 45V and a wire speed of 500m / min.

[0040] S2. Spraying strong oxidizing agent solution: After the copper single wire exits the continuous softening machine, a strong oxidizing agent solution is sprayed onto the surface of the copper single wire during normal operation. The pressure is controlled at 0.2 MPa. The strong oxidizing agent solution used includes sodium hydroxide solution and ammonium persulfate solution. The concentration of sodium hydroxide (NaOH) solution is 2.5 mol / L, and the concentration of ammonium persulfate ((NH4)2S2O8) solution is 0.2 mol / L. The volume ratio of sodium hydroxide solution to ammonium persulfate solution is 1:1.

[0041] S3. Copper single wire annealing: The copper single wire coated with strong oxidant is annealed and oxidized in an aging furnace. The annealing temperature is 180℃, the heating time is 2h, and the holding time is 3h to obtain copper oxide single wire. The average thickness of the copper oxide film is measured to be 2.8μm.

[0042] S4. Center filler core stranding: Copper oxide single wires with a diameter of 2.60mm-2.61mm are stranded into a center filler core. The center filler core adopts a 1+6+12 / 2.60mm structure, the outer layer stranding direction is left-handed, the outer layer pitch is 150mm, and the outer diameter is 11.5mm.

[0043] It is important to note that during stranding, the copper oxide single-wire feed reel of the frame stranding machine should be a 630 tooling reel. Before the copper oxide single-wire is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire guide wheel, and a wire guide roller inside the stranding body to protect the oxide layer from damage and peeling. The machine speed should be controlled at 25m / min during stranding.

[0044] S5. Stranded Conductor: The annealed multi-strand round copper wires (the inner layer copper wires of the stranded block have a diameter of 2.77 mm-2.78 mm, and the outer layer copper wires of the stranded block have a diameter of 2.74 mm-2.75 mm) are stranded into strands. The stranded structure of the oxidized stranded block is 91 / 2.73 mm. The stranding direction of each layer is left-handed. The V height of the strand is 30.6 mm, the fan width is 33.9 mm, the outer layer pitch of the conductor is 380 mm, the pre-twist pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0045] It is important to note that during stranding, before production of the single copper oxide wire on the frame stranding machine, the stranding machine should be replaced with nylon threading nozzles, wire guide rollers, and wire guide rollers inside the strand to protect the oxide layer from damage and peeling. Take-up is done using an aging fixture reel, with each reel containing strands. Silicone oil is added during conductor take-up. Special pressing dies are used when stranding the divided strands; a fan-shaped die is used for the inner layer, and a tile-shaped die is used for the outer layer. The machine speed is controlled at 15 m / min during the stranding process.

[0046] S6. Cabling: The central filler core and the segmented conductor blocks are cabled together, with the outer diameter of the cabled section controlled at 61.2 mm. Corrugated paper tape is placed between adjacent segmented conductor blocks.

[0047] S7. Covering with semi-conductive tape: After cabling, two layers of semi-conductive terylene tape are wrapped around the periphery of the conductor. The overlap rate of the semi-conductive tape wrapping is 45%, and the wrapping direction is right-handed. The outer diameter of the conductor after wrapping is controlled at 62.7mm.

[0048] Example 2 A process for producing an oxide conductor includes the following steps: S1. Copper Wire Drawing: Copper rods are drawn into copper single wires to produce three diameter sizes of copper single wires: 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm. Among them, the diameter of the copper single wire used for the center filling core is 2.60mm-2.61mm; the diameter of the inner layer copper single wire of the segmented strands is 2.77mm-2.78mm; and the diameter of the outer layer copper single wire of the segmented strands is 2.74mm-2.75mm.

[0049] The outer layer copper wire of the segmented strand refers to the copper wire around the fan-shaped perimeter of the segmented strand. The copper wire used outside the outer layer copper wire of the segmented strand is the inner layer copper wire. It should be noted that during the wire drawing process, the gas protection device in the continuous softening machine of the wire drawing machine can be omitted. The wire can be annealed in the continuous softening machine with an annealing voltage of 45V and a wire speed of 500m / min.

[0050] S2. Spraying strong oxidizing agent solution: After the copper single wire exits the continuous softening machine, a strong oxidizing agent solution is sprayed onto the surface of the copper single wire during normal operation. The pressure is controlled at 0.2 MPa. The strong oxidizing agent solution used includes sodium hydroxide solution and ammonium persulfate solution. The concentration of sodium hydroxide (NaOH) solution is 2.5 mol / L, and the concentration of ammonium persulfate ((NH4)2S2O8) solution is 0.2 mol / L. The volume ratio of sodium hydroxide solution to ammonium persulfate solution is 1:0.5.

[0051] S3. Copper single wire annealing: The copper single wire coated with strong oxidant was annealed and oxidized in an aging furnace. The annealing temperature was 180℃, the heating time was 2h, and the holding time was 3h to obtain copper oxide single wire. The average thickness of the copper oxide film was measured to be 2.4μm.

[0052] S4. Center filler core stranding: Copper oxide single wires with a diameter of 2.60mm-2.61mm are stranded into a center filler core. The center filler core adopts a 1+6+12 / 2.60mm structure, the outer layer stranding direction is left-handed, the outer layer pitch is 155mm, and the outer diameter is 11.5mm.

[0053] It is important to note that during stranding, the copper oxide single-wire feed reel of the frame stranding machine should be a 630 tooling reel. Before the copper oxide single-wire is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire guide wheel, and a wire guide roller inside the stranding body to protect the oxide layer from damage and peeling. The machine speed should be controlled at 25m / min during stranding.

[0054] S5. Stranded Conductor: The annealed multi-strand round copper wires (the inner layer copper wires of the stranded block have a diameter of 2.77 mm-2.78 mm, and the outer layer copper wires of the stranded block have a diameter of 2.74 mm-2.75 mm) are stranded into strands. The stranded structure of the oxidized stranded block is 91 / 2.73 mm. The stranding direction of each layer is left-handed. The V height of the strand is 30.58 mm, the fan width is 33.93 mm, the outer layer pitch of the conductor is 385 mm, the pre-twist pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0055] It is important to note that during stranding, before production of single-line copper oxide strands using a frame stranding machine, the stranding machine should be replaced with nylon threading nozzles, guide rollers, and guide rollers within the stranding body to protect the oxide layer from damage and detachment. Take-up is performed using an aging fixture reel, with each reel containing strands. Silicone oil is added during conductor take-up. Special pressing dies are used when stranding the divided strands; a fan-shaped die is used for the inner layer, and a tile-shaped die is used for the outer layer. The machine speed is controlled at 15 m / min during stranding. S6. Cabling: The central filler core and the segmented conductor blocks are cabled together, with the outer diameter of the cabled section controlled at 61.2 mm. Corrugated paper tape is placed between adjacent segmented conductor blocks.

[0056] S7. Covering with semi-conductive tape: After cabling, two layers of semi-conductive terylene tape are wrapped around the periphery of the conductor. The overlap rate of the semi-conductive tape wrapping is 45%, and the wrapping direction is right-handed. The outer diameter of the conductor after wrapping is controlled at 62.5mm.

[0057] Example 3 A process for producing an oxide conductor, characterized by comprising the following steps: S1. Copper Wire Drawing: Copper rods are drawn into copper single wires, resulting in three diameter sizes: 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm. The diameter of the copper single wire used for the central filling core is 2.60mm-2.61mm; the diameter of the inner layer copper single wire in the segmented strands is 2.77mm-2.78mm; and the diameter of the outer layer copper single wire in the segmented strands is 2.74mm-2.75mm.

[0058] The outer layer copper wire of the segmented strand refers to the copper wire around the fan-shaped perimeter of the segmented strand. The copper wire used outside the outer layer copper wire of the segmented strand is the inner layer copper wire. It should be noted that during the wire drawing process, the gas protection device in the continuous softening machine of the wire drawing machine can be omitted. The wire can be annealed in the continuous softening machine with an annealing voltage of 45V and a wire speed of 500m / min.

[0059] S2. Spraying strong oxidizing agent solution: After the copper single wire exits the continuous softening machine, a strong oxidizing agent solution is sprayed onto the surface of the copper single wire during normal operation. The pressure is controlled at 0.2 MPa. The strong oxidizing agent solution used includes sodium hydroxide solution and ammonium persulfate solution. The concentration of sodium hydroxide (NaOH) solution is 2.5 mol / L, and the concentration of ammonium persulfate ((NH4)2S2O8) solution is 0.2 mol / L. The volume ratio of sodium hydroxide solution to ammonium persulfate solution is 1:1.5.

[0060] S3. Copper single wire annealing: The copper single wire coated with strong oxidant is annealed and oxidized in an aging furnace. The annealing temperature is 180℃, the heating time is 2h, and the holding time is 3h to obtain copper oxide single wire. The average thickness of the copper oxide film is measured to be 3.0μm.

[0061] S4. Center filler core stranding: Copper oxide single wires with a diameter of 2.60mm-2.61mm are stranded into a center filler core. The center filler core adopts a 1+6+12 / 2.60mm structure, the outer layer stranding direction is left-handed, the outer layer pitch is 155mm, and the outer diameter is 11.5mm.

[0062] It is important to note that during stranding, the copper oxide single-wire feed reel of the frame stranding machine should be a 630 tooling reel. Before the copper oxide single-wire is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire guide wheel, and a wire guide roller inside the stranding body to protect the oxide layer from damage and peeling. The machine speed should be controlled at 25m / min during stranding.

[0063] S5. Stranded Conductor: The annealed multi-strand round copper wires (the inner layer copper wires of the stranded block have a diameter of 2.77 mm-2.78 mm, and the outer layer copper wires of the stranded block have a diameter of 2.74 mm-2.75 mm) are stranded into strands. The stranded structure of the oxidized stranded block is 91 / 2.73 mm. The stranding direction of each layer is left-handed. The V height of the strand is 30.6 mm, the fan width is 33.92 mm, the outer layer pitch of the conductor is 385 mm, the pre-twist pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0064] It is important to note that during stranding, before production of single-line copper oxide strands using a frame stranding machine, the stranding machine should be replaced with nylon threading nozzles, guide rollers, and guide rollers within the stranding body to protect the oxide layer from damage and detachment. Take-up is performed using an aging fixture reel, with each reel containing strands. Silicone oil is added during conductor take-up. Special pressing dies are used when stranding the divided strands; a fan-shaped die is used for the inner layer, and a tile-shaped die is used for the outer layer. The machine speed is controlled at 15 m / min during stranding. S6. Cabling: The central filler core and the segmented conductor blocks are cabled together, with the outer diameter of the cabled section controlled at 61.2 mm. Corrugated paper tape is placed between adjacent segmented conductor blocks.

[0065] S7. Covering with semi-conductive tape: After cabling, two layers of semi-conductive terylene tape are wrapped around the periphery of the conductor. The overlap rate of the semi-conductive tape wrapping is 45%, and the wrapping direction is right-handed. The outer diameter of the conductor after wrapping is controlled at 62.6mm.

[0066] Example 4 A process for producing an oxide conductor, characterized by comprising the following steps: S1. Copper Wire Drawing: The copper rod is drawn into copper single wires, resulting in three diameter sizes: 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm. The diameter of the copper single wire used for the central filling core is 2.60mm-2.61mm; the diameter of the inner layer copper single wire in the segmented strand 2 is 2.77mm-2.78mm; and the diameter of the outer layer copper single wire in the segmented strand is 2.74mm-2.75mm.

[0067] The outer layer copper wire of the segmented strand refers to the copper wire around the fan-shaped perimeter of the segmented strand. The copper wire used outside the outer layer copper wire of the segmented strand is the inner layer copper wire. It should be noted that during the wire drawing process, the gas protection device in the continuous softening machine of the wire drawing machine can be omitted. The wire can be annealed in the continuous softening machine with an annealing voltage of 45V and a wire speed of 500m / min.

[0068] S2. Spraying strong oxidizing agent solution: After the copper single wire exits the continuous softening machine, a strong oxidizing agent solution is sprayed onto the surface of the copper single wire during normal operation. The pressure is controlled at 0.2 MPa. The strong oxidizing agent solution used includes sodium hydroxide solution and ammonium persulfate solution. The concentration of sodium hydroxide (NaOH) solution is 2.5 mol / L, and the concentration of ammonium persulfate ((NH4)2S2O8) solution is 0.2 mol / L. The volume ratio of sodium hydroxide solution to ammonium persulfate solution is 1:1.

[0069] S3. Copper single wire annealing: The copper single wire coated with strong oxidant is annealed and oxidized in an aging furnace. The annealing temperature is 150℃, the heating time is 2h, and the holding time is 3h to oxidize the copper single wire and obtain copper oxide single wire. The average thickness of the copper oxide film is measured to be 2.2μm.

[0070] S4. Center filler core stranding: Copper oxide single wires with a diameter of 2.60mm-2.61mm are stranded into a center filler core. The center filler core adopts a 1+6+12 / 2.60mm structure, the outer layer stranding direction is left-handed, the outer layer pitch is 150mm, and the outer diameter is 11.5mm.

[0071] It is important to note that during stranding, the copper oxide single-wire feed reel of the frame stranding machine should be a 630 tooling reel. Before the copper oxide single-wire is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire guide wheel, and a wire guide roller inside the stranding body to protect the oxide layer from damage and peeling. The machine speed should be controlled at 25m / min during stranding.

[0072] S5. Stranded Conductor: The annealed multi-strand round copper wires (the inner layer copper wires of the stranded block have a diameter of 2.77 mm-2.78 mm, and the outer layer copper wires of the stranded block have a diameter of 2.74 mm-2.75 mm) are stranded into strands. The stranded structure of the oxidized stranded block is 91 / 2.73 mm. The stranding direction of each layer is left-handed. The V height of the strand is 30.6 mm, the fan width is 33.9 mm, the outer layer pitch of the conductor is 380 mm, the pre-twist pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0073] It is important to note that during stranding, before production of single-line copper oxide strands using a frame stranding machine, the stranding machine should be replaced with nylon threading nozzles, guide rollers, and guide rollers within the stranding body to protect the oxide layer from damage and detachment. Take-up is performed using an aging fixture reel, with each reel containing strands. Silicone oil is added during conductor take-up. Special pressing dies are used when stranding the divided strands; a fan-shaped die is used for the inner layer, and a tile-shaped die is used for the outer layer. The machine speed is controlled at 15 m / min during stranding. S6. Cabling: The central filler core and the segmented conductor blocks are cabled together, with the outer diameter of the cabled section controlled at 61.2 mm. Corrugated paper tape is placed between adjacent segmented conductor blocks.

[0074] S7. Covering with semi-conductive tape: After cabling, two layers of semi-conductive terylene tape are wrapped around the periphery of the conductor. The overlap rate of the semi-conductive tape wrapping is 45%, and the wrapping direction is right-handed. The outer diameter of the conductor after wrapping is controlled at 62.6mm.

[0075] Example 5 A process for producing an oxide conductor, characterized by comprising the following steps: S1. Copper Wire Drawing: The copper rod is drawn into copper single wires, resulting in three diameter sizes: 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm. The diameter of the copper single wire used for the central filling core is 2.60mm-2.61mm; the diameter of the inner layer copper single wire in the segmented strand 2 is 2.77mm-2.78mm; and the diameter of the outer layer copper single wire in the segmented strand is 2.74mm-2.75mm.

[0076] The outer layer copper wire of the segmented strand refers to the copper wire around the fan-shaped perimeter of the segmented strand. The copper wire used outside the outer layer copper wire of the segmented strand is the inner layer copper wire. It should be noted that during the wire drawing process, the gas protection device in the continuous softening machine of the wire drawing machine can be omitted. The wire can be annealed in the continuous softening machine with an annealing voltage of 45V and a wire speed of 500m / min.

[0077] S2. Spraying strong oxidizing agent solution: After the copper single wire exits the continuous softening machine, a strong oxidizing agent solution is sprayed onto the surface of the copper single wire during normal operation. The pressure is controlled at 0.2 MPa. The strong oxidizing agent solution used includes sodium hydroxide solution and ammonium persulfate solution. The concentration of sodium hydroxide (NaOH) solution is 2.5 mol / L, and the concentration of ammonium persulfate ((NH4)2S2O8) solution is 0.2 mol / L. The volume ratio of sodium hydroxide solution to ammonium persulfate solution is 1:1.

[0078] S3. Copper single wire annealing: The copper single wire coated with strong oxidant is annealed and oxidized in an aging furnace. The annealing temperature is 200℃, the heating time is 2h, and the holding time is 3h to oxidize the copper single wire and obtain copper oxide single wire. The thickness of the copper oxide film is measured to be an average of 3.1μm.

[0079] S4. Center filler core stranding: Copper oxide single wires with a diameter of 2.60mm-2.61mm are stranded into a center filler core. The center filler core adopts a 1+6+12 / 2.60mm structure, the outer layer stranding direction is left-handed, the outer layer pitch is 150mm, and the outer diameter is 11.5mm.

[0080] It is important to note that during stranding, the copper oxide single-wire feed reel of the frame stranding machine should be a 630 tooling reel. Before the copper oxide single-wire is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire guide wheel, and a wire guide roller inside the stranding body to protect the oxide layer from damage and peeling. The machine speed should be controlled at 25m / min during stranding.

[0081] S5. Stranded Conductor: The annealed multi-strand round copper wires (the inner layer copper wires of the stranded block have a diameter of 2.77 mm-2.78 mm, and the outer layer copper wires of the stranded block have a diameter of 2.74 mm-2.75 mm) are stranded into strands. The stranded structure of the oxidized stranded block is 91 / 2.73 mm. The stranding direction of each layer is left-handed. The V height of the strand is 30.6 mm, the fan width is 33.9 mm, the outer layer pitch of the conductor is 380 mm, the pre-twist pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0082] It is important to note that during stranding, before production of single-line copper oxide strands using a frame stranding machine, the stranding machine should be replaced with nylon threading nozzles, guide rollers, and guide rollers within the stranding body to protect the oxide layer from damage and detachment. Take-up is performed using an aging fixture reel, with each reel containing strands. Silicone oil is added during conductor take-up. Special pressing dies are used when stranding the divided strands; a fan-shaped die is used for the inner layer, and a tile-shaped die is used for the outer layer. The machine speed is controlled at 15 m / min during stranding. S6. Cabling: The central filler core and the segmented conductor blocks are cabled together, with the outer diameter of the cabled section controlled at 61.2 mm. Corrugated paper tape is placed between adjacent segmented conductor blocks.

[0083] S7. Covering with semi-conductive tape: After cabling, two layers of semi-conductive terylene tape are wrapped around the periphery of the conductor. The overlap rate of the semi-conductive tape wrapping is 45%, and the wrapping direction is right-handed. The outer diameter of the conductor after wrapping is controlled at 62.7mm.

[0084] Comparative Example 1 Conventional conductor (TBEA Shandong Luneng Taishan Cable Co., Ltd., YJLW02 290 / 500kV 1×2500mm² cable 2500mm² conductor).

[0085] Comparative Example 2 Unlike Example 1, in step S2, only a sodium hydroxide (NaOH) solution with a concentration of 2.5 mol / L was used for spraying; the other preparation steps were the same as in Example 1.

[0086] Comparative Example 3 Unlike Example 1, in step S2, only ammonium persulfate ((NH4)2S2O8) solution with a concentration of 0.2 mol / L was used for spraying; the other preparation steps were the same as in Example 1.

[0087] Comparative Example 4 Unlike Example 1, in step S2, only a CuSO4 solution with a concentration of 2.5 mol / L was used for spraying; the other preparation steps were the same as in Example 1.

[0088] Comparative Example 5 Unlike Example 1, in step S2, the strong oxidant solution is sprayed with a sodium hydroxide (NaOH) solution concentration of 1.0 mol / L and an ammonium persulfate ((NH4)2S2O8) solution concentration of 0.5 mol / L, with a sodium hydroxide to ammonium persulfate solution volume ratio of 1:3. Other preparation steps are the same as in Example 1.

[0089] Comparative Example 6 Unlike Example 1, steps S2 and S3 are omitted, and copper wire is directly oxidized at a temperature of 350°C to obtain copper oxide wire. Other preparation steps are the same as in Example 1.

[0090] The thickness of the oxide film on the conductor surface and the AC resistance of the above embodiments and comparative examples were measured, and the results are shown in Table 1.

[0091] Table 1 Properties of copper oxide conductors

[0092] In Table 1, " / " indicates that no test was conducted, and the year-on-year decrease in AC resistance is the rate of decrease in AC resistance compared to the conventional conductor in Comparative Example 1.

[0093] As shown in Table 1, the ammonium persulfate ((NH4)2S2O8) in Examples 1-5 of this invention undergoes hydrolysis in water, producing persulfate ions with strong oxidizing properties. Under alkaline conditions (sodium hydroxide solution), the oxidizing power of persulfate ions is further enhanced, enabling them to oxidize copper to copper ions (Cu). 2+ Copper ions then react with hydroxide ions (OH-) − The copper hydroxide (Cu(OH)2) is formed by combining with the copper oxide. When the copper hydroxide is further heated and annealed at a temperature above 150°C, it decomposes to form black copper oxide (CuO). The thickness of the copper oxide film on the surface of the oxide conductor and between the copper oxide individual lines is 2.0 μm-3.5 μm. Compared with the traditional round conductor (Comparative Example 1), the AC resistance of the oxide conductor is reduced by about 20%.

[0094] In Comparative Example 2, copper is also oxidized using a single sodium hydroxide (NaOH) solution at high temperatures, but the oxidizing power is poor. Under the conditions of Comparative Example 2, the resulting oxide layer is thinner.

[0095] In Comparative Example 3, a single ammonium persulfate ((NH4)2S2O8) solution reacts with copper to form CuSO4. CuSO4 decomposes into copper oxide (CuO) at high temperatures, but the decomposition temperature is usually above 650℃. Under the conditions of Comparative Example 3, the decomposition effect cannot be achieved.

[0096] In Comparative Example 4, the CuSO4 solution does not actively react with copper without the addition of a strong external oxidant. The temperature at which CuSO4 decomposes into copper oxide (CuO) at high temperatures is usually above 650℃.

[0097] In Comparative Example 5, the sodium hydroxide (NaOH) solution had a low concentration, resulting in less copper hydroxide (Cu(OH)2) being generated when reacting with copper and ammonium persulfate ((NH4)2S2O8) solution, thus causing the subsequent copper oxide film to be thinner.

[0098] In Comparative Example 6, copper single wires can form a copper oxide film on their surface with oxygen in the air at high temperatures, but the thickness of the formed copper oxide film is uneven and the formed copper oxide film is relatively thin.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A manufacturing process for an oxide conductor, characterized in that, Includes the following steps: S1. Draw the copper rod into copper single wire; S2. Spray a strong oxidizing agent solution onto the surface of the copper single wire; S3. Anneal the copper wire coated with a strong oxidizing agent solution to obtain copper oxide wire; S4. Twist multiple copper oxide single wires together to form a center filling core; S5. Twist multiple copper oxide single wires into a segmented conductor block; S6. The stranded center filler core and the divided strand conductors are then cabled. S7. Coating the surface of the conductor after cabling with a semiconducting tape yields a copper oxide conductor. In step S2, the strong oxidant solution includes sodium hydroxide solution and ammonium persulfate solution. The concentration of sodium hydroxide solution is 2-3 mol / L, the concentration of ammonium persulfate solution is 0.1-0.3 mol / L, and the volume ratio of sodium hydroxide solution to ammonium persulfate solution is 1:(0.5-1.5). In step S3, the annealing temperature is 150℃-200℃, and the holding time is 3-5h. The thickness of the copper oxide film in the copper oxide single wire is 2.0μm-3.5μm.

2. The production process of the oxide conductor according to claim 1, characterized in that, In step S1, the diameter of the copper single wire is 2.58mm-2.78mm.

3. The production process of the oxide conductor according to claim 1, characterized in that, In step S2, the amount of strong oxidant solution sprayed is controlled by adjusting the travel speed of the copper single wire. The travel speed of the copper single wire is 400 m / min-600 m / min.

4. The production process of the oxide conductor according to claim 1, characterized in that, In step S4, the center filling core adopts a 1+6+12 / 2.60mm structure; the twisting speed is 20-30m / min.

5. The production process of the oxide conductor according to claim 1, characterized in that, In step S5, the stranding speed is controlled at 10-15m / min; the pitch of the outer single wire is controlled at 360mm-400mm; the pitch of the cabling is controlled at 1770mm-1830mm; and the stranding direction of each layer of copper oxide single wire is left-handed. The structure of the stranded conductor is 91 / 2.73mm. The inner layer of the stranded conductor is made of fan-shaped mold and the outer layer is made of tile-shaped mold.

6. The production process of the oxide conductor according to claim 1, characterized in that, In step S6, the outer diameter of the cable is 60-62mm, and a corrugated paper tape is provided between two adjacent split conductor strands.

7. The production process of the oxide conductor according to claim 1, characterized in that, In step S7, the semiconducting tape is a Tetralon tape, the overlap rate of the semiconducting tape is 40%-50%, the winding direction is right-handed, and the outer diameter of the conductor after wrapping is 61.5-64 mm.

8. An oxide conductor produced by the manufacturing process of an oxide conductor according to any one of claims 1-7, characterized in that, It includes a wire core and a semiconductive strip covering the surface of the wire core; the wire core includes a wire core body and a crepe paper strip, the wire core body includes a central filling core and several fan-shaped segmented strands of the same size and cross-sectional shape twisted together on the periphery of the central filling core; the crepe paper strip is disposed between two adjacent segmented strands. The core body is made of copper oxide single wire, which includes copper single wire and copper oxide film covering the surface of copper single wire. The thickness of the copper oxide film is 2.0μm-3.5μm.

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