Oxidized conductor and production process thereof

Abstract

The embodiment of the invention belongs to the technical field of cable conductors, and particularly relates to an oxidized conductor and a production process thereof, and the production process comprises the following steps: copper wire drawing, strong oxidant solution spraying, copper single wire annealing, central filling core twisting, segmented strand block conductor twisting, cabling and semi-conductive band coating. According to the embodiment of the invention, a layer of sodium hydroxide and ammonium persulfate mixed strong oxidant solution is sprayed on the surface of the copper single wire, and the thickness of a copper oxide film on the surface of an oxidized conductor and between the copper oxide single wires can be 2.0-3.5 microns only at a lower temperature of 150-200 DEG C during annealing. Meanwhile, the copper oxide film is used as a semi-conductive material, so that the problems of remarkable skin effect, increased alternating-current resistance and the like of a traditional circular conductor under the condition of a large cross section are solved, compared with the traditional circular conductor, the alternating-current resistance of the oxidized conductor is reduced by about 20% on year-on-year basis, and the conductivity of the conductor is improved.

Description

Technical Field

[0001] The embodiments of the present invention belong to the technical field of cable conductors, and particularly relate to an oxidized conductor and a production process thereof. Background Art

[0002] With the growing demand for power transmission, large-section conductors are increasingly being used in large-scale power transmission due to their higher current carrying capacity and lower losses, enabling a more stable power supply and more efficient energy transmission. However, traditional circular conductors, when used with large cross-sections, suffer from significant skin effect and increased AC resistance. While split conductor 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 needs of large-capacity, low-loss power transmission. In addition, pure copper tends to heat up when transmitting large currents, and its resistance increases with increasing temperature, leading to increased power loss.

[0003] Currently, a 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 pollutes the environment, but also degrades 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 during welding, which is difficult to remove, and incomplete removal affects the welding quality. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide an oxidized conductor and a production process thereof to solve the problems of complex production process and production efficiency of copper oxide films.

[0005] The oxidized conductors in the embodiment of the present invention include circular compacted conductors and split conductors. To facilitate understanding of the technical solution of the embodiment of the present invention, the embodiment of the present invention takes the split conductor as an example to describe the technical solution of the present invention in detail: In a first aspect, an embodiment of the present invention provides a production process for an oxidized conductor, comprising the following steps: S1, drawing the copper rod into copper single wire; S2. Spraying a strong oxidant solution on the surface of the copper wire; S3, annealing the copper wire sprayed with the strong oxidant solution to obtain a copper oxide wire; S4, twisting multiple copper oxide single wires into a central filling core; S5, twisting multiple copper oxide single wires into split strand block conductors; S6, cabling the twisted center filler core and the split strand conductors; S7. After being cabled, the surface of the conductor is covered with a semi-conductive tape to obtain a copper oxide conductor.

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

[0007] Exemplarily, the diameter of the copper single wire is 2.58 mm to 2.62 mm and 2.74 mm to 2.78 mm.

[0008] Furthermore, the diameters of the copper single wires are 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm, respectively. The copper single wire with a diameter of 2.60mm-2.61mm is used as the center filler core; the copper single wire with a diameter of 2.77mm-2.78mm is used as the inner copper single wire of the split strand; and the copper single wire with a diameter of 2.74mm-2.75mm is used as the outer copper single wire of the split strand.

[0009] The outer copper wires of the split strands refer to the copper wires around the fan-shaped periphery of the split strands, and the copper wires used in the split strands other than the outer copper wires are the inner copper wires. The copper wires used in the center filler core have a smaller diameter than the copper wires of the split strands, which can optimize flexibility, lightweight, or electrical performance while ensuring basic mechanical functions. The thicker inner copper wires of the split strands can directly withstand the tensile load of the conductor and are more resistant to creep deformation caused by long-term mechanical stress. The thinner outer copper wires of the split strands improve the bending performance of the cable, adapt to the bending requirements during installation, and the surface is smoother after the thin wires are twisted, reducing insulation wear and improving the electric field distribution.

[0010] In some other embodiments, in step S2, the amount of the strong oxidant solution sprayed is controlled by adjusting the line speed of the copper wire, and the line speed of the copper wire is 400 m / min-600 m / min. Exemplarily, the line speed of the copper wire is 400 m / min, 500 m / min, or 600 m / min.

[0011] 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, and the copper wire can be annealed in the continuous softening machine at an annealing voltage of 45V. By spraying a mixed alkaline strong oxidant solution, namely sodium hydroxide and ammonium persulfate solution, on the surface of the copper monofilament, the oxidation of the copper monofilament can be promoted, avoiding the conventional process operations such as the need to prepare the copper oxide film at high temperature and the subsequent complex annealing.

[0012] In some other embodiments, in step S2, the strong oxidant solution includes a sodium hydroxide solution and an ammonium persulfate solution, 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, the concentrations of ammonium persulfate solution are 0.1, 0.2, and 0.3 mol / L, and the volume ratios of sodium hydroxide solution to ammonium persulfate solution are 1:0.5, 1:1, and 1:1.5. Within this range, ammonium persulfate exhibits a milder oxidizing ability under alkaline conditions (pH adjusted by NaOH), resulting in a more uniform oxide layer (e.g., CuO), making it suitable for surface treatment.

[0014] In some other embodiments, in step S3, the annealing temperature is 150° C.-200° C., the temperature is kept for 3-5 hours, and the thickness of the copper oxide film in the copper oxide single wire is 2.0 μm-3.5 μm.

[0015] Exemplarily, 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, 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] The annealing process can further oxidize the copper single wire to obtain an oxidized copper single wire.

[0017] In some other embodiments, in step S4, the center filler core adopts a 1+6+12 / 2.60mm structure; 1+6+12 / 2.60mm represents the number of core mold layers or their arrangement: 1 center layer, 6 middle layers, and 12 outer layers; 2.60mm represents the thickness of each layer or the total thickness of the core mold. A frame stranding machine is used for stranding, and a 630 tooling reel is used for the copper oxide single wire payoff. Before the copper oxide single wire is loaded onto the machine for production, the stranding machine is replaced with a nylon threading nozzle, wire guide pulley, and wire guide rollers within the stranding body. The stranding speed is 20-30m / min to protect the oxide layer from damage and shedding.

[0018] In some other embodiments, in step S5, the vehicle speed during twisting is controlled at 10-15 m / min; the pitch of the outer layer single wires is controlled at 360 mm-400 mm, the cable pitch is controlled at 1770 mm-1830 mm, and the twist direction of each layer of single wires is left-handed; The stranded conductors are constructed with a 91 / 2.73mm diameter. The strands are twisted using a fan-shaped die for the inner layer and a tile-shaped die for the outer layer. A frame stranding machine is used, and the copper oxide single-wire payoff reel uses a 630 tooling reel. Before the copper oxide single wire is loaded onto the machine for production, the stranding machine uses a nylon threading nozzle, wire pulley, and wire guide rollers inside the stranding body to protect the oxide layer from damage and shedding. During take-up, the strands are held on a single reel. Silicone oil is dripped into the conductor as it is taken up, and PE film is used between the strands during take-up. When the strands are drawn from single wire, the inner layer's diameter is (+0.04, +0.05), while the outer layer's diameter is (+0.01, +0.02). Special dies are used for stranding: a fan-shaped die for the inner layer and a tile-shaped die for the outer layer.

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

[0020] In some other embodiments, in step S7, the semi-conductive tape is a terylene tape, the overlap rate of the semi-conductive 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 oxidized conductor and an oxidized conductor produced by the production process described in the first aspect, comprising a core and a semiconductive tape coated on the surface of the core; the core comprising a core body and a corrugated paper tape; the core body comprising a central filling core and a plurality of fan-shaped segments of the same size and cross-sectional shape twisted together in a cross-section around the central filling core; the corrugated paper tape being disposed between adjacent segments; The wire core body adopts a copper oxide single wire, which includes a copper single wire and a copper oxide film coated on the surface of the copper single wire. The thickness of the copper oxide film is 2.0μm-3.5μm.

[0022] In addition, the production process of the embodiment of the present invention is also applicable to the preparation of a circular compressed conductor, and the specific process is as follows: S1, drawing the copper rod into copper single wire; S2. Spraying a strong oxidant solution on the surface of the copper wire; S3, annealing the copper wire sprayed with the strong oxidant solution to obtain a copper oxide wire; S4, twisting multiple copper oxide wires into a round compact conductor; S5. A circular compact conductor is obtained by wrapping a semi-conductive tape on the surface of the circular compact conductor.

[0023] Beneficial effects of the embodiments of the present invention: (1) The method for preparing an oxidized conductor provided by an embodiment of the present invention is simple to operate. A strong oxidant solution is sprayed onto the surface of a copper wire to oxidize the surface of the copper wire, and after annealing, a copper oxide wire is obtained. In the process of preparing the copper oxide conductor, the copper oxide film formed on the surface of the copper oxide wire can serve as a semi-conductive material to replace the paint film on the surface of the copper wire, separating the individual copper wires. At the same time, the copper oxide film can be directly welded, avoiding the problem of traditional enameled wire welding, which requires the paint film to be removed before welding, and the difficulty of removing the insulating paint. This improves the processing rate of subsequent copper oxide conductor processing, such as twisting and cabling of the center filling core and split strand block conductors, reduces production costs, and reduces environmental pollution.

[0024] (2) The method for preparing the oxidized conductor provided in the embodiment of the present invention avoids the conventional copper oxide single wire, which requires the copper oxide film to be prepared at high temperature and cannot accurately control the thickness of the copper oxide film; it also avoids the existing electrochemical method or immersion method of treating the substrate surface with a strong oxidant solution (sodium hydroxide and ammonium persulfate), which is a relatively complex and time-consuming process and is not suitable for large-scale production applications. The copper oxide single wire of the present invention only needs to add a spraying device on the basis of the existing copper single wire production process, spray the sodium hydroxide and ammonium persulfate in the strong oxidant solution on the surface of the copper single wire, and promote the oxidation of the copper single wire through the synergistic effect of the sodium hydroxide and ammonium persulfate, combined with the subsequent annealing treatment, to produce the copper oxide single wire. The preparation process of the copper oxide single wire of the present invention has mild reaction conditions, simple operation, high production efficiency, and is suitable for industrial promotion and application.

[0025] (3) The copper oxide conductor produced by the method for preparing an oxide conductor provided in the embodiments of the present invention can meet the requirements of high-capacity, low-loss power transmission. The structure of the oxide conductor does not contain insulating varnish, the production process is simple, and the production cost is low. In addition, compared with traditional circular conductors, the AC resistance of the oxide conductor is reduced by approximately 20% year-on-year, thereby improving the conductor conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the description of the embodiments of the present invention are used to provide a further understanding of the embodiments of the present invention. The schematic embodiments of the embodiments of the present invention and their descriptions are used to explain the embodiments of the present invention and do not constitute improper limitations on the embodiments of the present invention.

[0027] Figure 1 is a schematic diagram of an oxidized conductor according to Example 1 of the present invention; Figure 2 is a schematic diagram of a copper oxide single wire according to Example 1 of the present invention; Among them, there are a central filling core 1, divided strand blocks 2, crepe paper tape 3, semi-conductive tape 4, copper single wire 5, and copper oxide film 6. DETAILED DESCRIPTION

[0028] Those skilled in the art will understand that the following examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. Unless otherwise specified, the following conditions were followed according to conventional conditions or those recommended by the manufacturer. Components used without manufacturer identification are commercially available conventional products. The copper oxide conductors in the present invention may be round compacted conductors or split conductors.

[0029] In view of the problems of low production efficiency and high cost caused by high preparation temperature and complex preparation process of copper oxide film in copper oxide wire in the prior art, an embodiment of the present invention provides a production process of oxidized conductor, comprising the following steps: S1, drawing the copper rod into copper single wire; S2. Spraying a strong oxidant solution on the surface of the copper wire; S3, annealing the copper wire sprayed with the strong oxidant solution to obtain a copper oxide wire; S4, twisting multiple copper oxide single wires into a central filling core; S5, twisting multiple copper oxide single wires into split strand block conductors; S6, cabling the twisted center filler core and the split strand conductors; S7. After being cabled, the surface of the conductor is covered with a semi-conductive tape to obtain a copper oxide conductor.

[0030] The production process for copper oxide conductors is simple. A strong oxidant solution is sprayed onto the surface of a copper wire to oxidize it, followed by annealing to produce copper oxide wire. During the copper oxide conductor production process, the copper oxide film formed on the surface of the copper wire acts as a semi-conductive material, replacing the paint film on the copper wire surface, separating the individual copper wires. Furthermore, the copper oxide film can be directly welded, eliminating the need to remove the paint film before welding and the difficulty of removing the insulating varnish during traditional enameled wire welding. This improves the efficiency of subsequent copper oxide conductor processing, such as twisting and cabling of center-filled cores and split strands, reducing production costs and minimizing environmental pollution.

[0031] The oxide conductor produced by the embodiments of the present invention has a conventional structure, comprising a core and a semiconductive tape coated on the core surface. The core comprises a core body and a corrugated paper tape. The core body comprises a central filler core and segmented segments. The segmented segments are fan-shaped, identical in size and cross-sectional shape, and are twisted and distributed along the cross-section around the central filler core. The corrugated paper tape is positioned between adjacent segments.

[0032] In order to more clearly understand the oxide conductor prepared in the embodiment of the present invention, the following Figure 1 Taking α as an example, the structure of the prepared oxide conductor is described as follows: from Figure 1 As can be seen, the oxide conductor comprises a core and a semiconductive tape 4 wrapped around the core. The core comprises a core body and a corrugated paper tape 3. The core body comprises a central filler core 1 and segmented strands 2. The segmented strands 2 are multiple, fan-shaped structures of identical size and cross-sectional shape, with corrugated paper tape 3 positioned between adjacent segments 2. Several segments 2 are twisted together in a cross-sectional area around the central filler core 1.

[0033] For example, the core body includes a central filler core 1 and five split strands. The central filler core 1 is a 1+6+12 / 2.60mm round copper wire. The diameter of the 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] The split stock 2 is a fan-shaped structure formed by a 91 / 2.73mm structure. The V height of the split stock 2 is 30.6mm, the fan width is 33.9mm, the conductor outer layer pitch is 380mm, the pre-twisted pitch is 1800mm, and the conductor cross-section is 478mm. 2 The V-height of the stock block is a technical parameter of the split stock block, which is the distance between the fan-shaped outer arc surface of the split stock block and the bottom of the V-shaped clamping plate when the V-shaped clamping plate is clamped on the two sides and inner arc surface of the split stock block.

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

[0036] The structural diagram of copper oxide single wire is as follows Figure 2 As shown. Figure 2 It can be seen that the copper oxide single wire includes a copper single wire 5 and a copper oxide film 6. The copper oxide film 6 is coated on the surface of the copper single wire 5. The copper oxide film 6 prepared by the embodiment of the present invention has a thickness of 2.8 μm.

[0037] As can be seen, the embodiments of the present invention provide an oxidized conductor and production process that solves the problems of low production efficiency and high costs caused by the high temperature and complex preparation process of the copper oxide film in oxidized copper wire. Furthermore, the process reduces the skin effect and AC resistance of large-cross-section conductors and addresses the complex and high-cost production process of enameled conductors, as well as the environmental pollution and difficulty in removing the insulating varnish from the enameled wire.

[0038] The following is a further detailed description of the operating steps and performance of the embodiments of the present invention in conjunction with the embodiments: Example 1 A production process for an oxidized conductor comprises the following steps: S1. Copper wire drawing: Copper rods are drawn into copper single wires to produce copper single wires of three diameters, with diameters of 2.60 mm to 2.61 mm, 2.77 mm to 2.78 mm, and 2.74 mm to 2.75 mm, respectively. Among them, the diameter of the copper single wire used for the center filling core is 2.60 mm to 2.61 mm; the diameter of the inner copper single wire of the split stock block 2 is 2.77 mm to 2.78 mm, and the diameter of the outer copper single wire of the split stock block is 2.74 mm to 2.75 mm.

[0039] The outer copper wires of the split strand refer to the copper wires surrounding the fan-shaped periphery of the split strand. The copper wires used in the split strand beyond the outer copper wires are called the inner copper wires. It is important to note that the gas shielding device in the continuous softening unit of the wire drawing machine can be omitted during the wire drawing process. Annealing in the continuous softening unit is performed at a voltage of 45V and a line speed of 500m / min.

[0040] S2. Spraying strong oxidant solution: After the copper wire exits the continuous softening machine, spray a strong oxidant solution onto the surface of the copper wire while the copper wire is running normally. The pressure is controlled at 0.2 MPa. The strong oxidant solutions used include 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 and ammonium persulfate solution is 1:1.

[0041] S3. Copper wire annealing: The copper wire sprayed with a strong oxidant is subjected to annealing and oxidation treatment in an aging furnace at a temperature of 180° C., a heating time of 2 hours, and a holding time of 3 hours to obtain a copper oxide wire. The average thickness of the copper oxide film is measured to be 2.8 μm.

[0042] S4. Center filling core twisting: Copper oxide single wires with a diameter of 2.60mm-2.61mm are twisted into a center filling core. The center filling core adopts a 1+6+12 / 2.60mm structure, the outer layer is twisted in the left direction, 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 payoff reel used on the frame stranding machine is a 630 tooling reel. Before the copper oxide single wire is loaded onto the machine for production, the stranding machine uses a nylon threading nozzle, wire pulley, and wire guide rollers inside the stranding body to protect the oxide layer from damage and shedding. The machine speed is controlled at 25m / min during the stranding process.

[0044] S5. Stranding of split strand conductors: Twist annealed multiple round copper wires (the diameter of the inner copper wire of the split strand is 2.77 mm-2.78 mm, and the diameter of the outer copper wire of the split strand is 2.74 mm-2.75 mm) into split strands. The twisted structure of the oxidized split strand is 91 / 2.73 mm. The twisting direction of each strand is left-handed. The strand V height is 30.6 mm, the fan width is 33.9 mm, the conductor outer layer pitch is 380 mm, the pre-twisted pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0045] It is important to note that before the copper oxide single wire from the frame stranding machine is loaded onto the machine for production, the stranding machine's nylon threading nozzle, wire pulley, and wire guide rollers inside the stranding body are replaced to protect the oxide layer from damage and shedding. The wire is taken up using an aging tool reel, which holds the strands. Silicone oil is dripped into the conductor as it is taken up. Specialized dies are used for stranding the split strands: a fan-shaped die for the inner layer and a tile-shaped die for the outer layer. The machine speed is controlled at 15m / min during the stranding process.

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

[0047] S7. Wrapping with semi-conductive tape: After cabling, wrap two layers of semi-conductive Tetoron tape around the conductor. The overlap rate of the semi-conductive tape is 45%, and the winding direction is right-hand. The outer diameter of the conductor after wrapping is controlled at 62.7mm.

[0048] Example 2 A production process for an oxidized conductor comprises the following steps: S1. Copper wire drawing: Copper rods are drawn into copper single wires to produce copper single wires of three diameters, with diameters of 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm, respectively. 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 copper single wire of the split stock block is 2.77mm-2.78mm, and the diameter of the outer copper single wire of the split stock block is 2.74mm-2.75mm.

[0049] The outer copper wires of the split strand refer to the copper wires surrounding the fan-shaped periphery of the split strand. The copper wires used in the split strand beyond the outer copper wires are called the inner copper wires. It is important to note that the gas shielding device in the continuous softening unit of the wire drawing machine can be omitted during the wire drawing process. Annealing in the continuous softening unit is performed at a voltage of 45V and a line speed of 500m / min.

[0050] S2. Spraying strong oxidant solution: After the copper wire exits the continuous softening machine, spray a strong oxidant solution onto the surface of the copper wire while the copper wire is running normally. The pressure is controlled at 0.2 MPa. The strong oxidant solutions used include 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 and ammonium persulfate solution is 1:0.5.

[0051] S3. Copper wire annealing: The copper wire sprayed with a strong oxidant is annealed and oxidized in an aging furnace at a temperature of 180° C., a heating time of 2 hours, and a holding time of 3 hours to obtain a copper oxide wire. The average thickness of the copper oxide film is measured to be 2.4 μm.

[0052] S4. Center filling core twisting: Copper oxide single wires with a diameter of 2.60mm-2.61mm are twisted into a center filling core. The center filling core adopts a 1+6+12 / 2.60mm structure, the outer layer is twisted in the left direction, 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 payoff reel used on the frame stranding machine is a 630 tooling reel. Before the copper oxide single wire is loaded onto the machine for production, the stranding machine uses a nylon threading nozzle, wire pulley, and wire guide rollers inside the stranding body to protect the oxide layer from damage and shedding. The machine speed is controlled at 25m / min during the stranding process.

[0054] S5. Stranding of split strand conductors: Twist annealed multiple round copper wires (the diameter of the inner copper wire of the split strand is 2.77 mm-2.78 mm, and the diameter of the outer copper wire of the split strand is 2.74 mm-2.75 mm) into split strands. The twisted structure of the oxidized split strand is 91 / 2.73 mm. The twisting direction of each strand is left-handed. The strand V height is 30.58 mm, the fan width is 33.93 mm, the conductor outer layer pitch is 385 mm, the pre-twisted pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0055] It should be noted that when stranding, before the copper oxide single wire of the frame stranding machine is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire wheel, and a wire guide roller in the stranding body to protect the oxide layer from damage and shedding. The wire is taken up with an aging tooling reel, and the strand blocks are placed on a single reel. Silicone oil is added when the conductor is taken up. Special dies are used for stranding the split strands, with a fan-shaped die for the inner layer and a tile-shaped die for the outer layer. The speed is controlled at 15m / min during the stranding process. S6. Cabling: The center filler core and the split conductor blocks are cabled together, with the outer diameter of the cable controlled at 61.2 mm. Corrugated paper tape is placed between adjacent split conductor blocks.

[0056] S7. Wrapping with semi-conductive tape: After cabling, wrap two layers of semi-conductive Tetoron tape around the conductor. The overlap rate of the semi-conductive tape is 45%, and the winding direction is right-hand. The outer diameter of the conductor after wrapping is controlled at 62.5mm.

[0057] Example 3 A production process for an oxidized conductor, characterized by comprising the following steps: S1. Copper Wire Drawing: Copper rods are drawn into copper wires, resulting in three diameters: 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm. The diameter of the central copper wire is 2.60mm-2.61mm; the diameter of the inner copper wire of the split strands is 2.77mm-2.78mm, and the diameter of the outer copper wire of the split strands is 2.74mm-2.75mm.

[0058] The outer copper wires of the split strand refer to the copper wires surrounding the fan-shaped periphery of the split strand. The copper wires used in the split strand beyond the outer copper wires are called the inner copper wires. It is important to note that the gas shielding device in the continuous softening unit of the wire drawing machine can be omitted during the wire drawing process. Annealing in the continuous softening unit is performed at a voltage of 45V and a line speed of 500m / min.

[0059] S2. Spraying strong oxidant solution: After the copper wire leaves the continuous softening machine, spray a strong oxidant solution onto the surface of the copper wire while the copper wire is running normally. The pressure is controlled at 0.2MPa. The strong oxidant solutions used include sodium hydroxide solution and ammonium persulfate solution. The concentration of sodium hydroxide (NaOH) solution is 2.5mol / L, and the concentration of ammonium persulfate ((NH4)2S2O8) solution is 0.2mol / L. The volume ratio of sodium hydroxide and ammonium persulfate solution is 1:1.5.

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

[0061] S4. Center filling core twisting: Copper oxide single wires with a diameter of 2.60mm-2.61mm are twisted into a center filling core. The center filling core adopts a 1+6+12 / 2.60mm structure, the outer layer is twisted in the left direction, 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 payoff reel used on the frame stranding machine is a 630 tooling reel. Before the copper oxide single wire is loaded onto the machine for production, the stranding machine uses a nylon threading nozzle, wire pulley, and wire guide rollers inside the stranding body to protect the oxide layer from damage and shedding. The machine speed is controlled at 25m / min during the stranding process.

[0063] S5. Stranding of split strand conductors: Twist annealed multiple round copper wires (the diameter of the inner copper wire of the split strand is 2.77 mm-2.78 mm, and the diameter of the outer copper wire of the split strand is 2.74 mm-2.75 mm) into split strands. The twisted structure of the oxidized split strand is 91 / 2.73 mm. The twisting direction of each strand is left-handed. The strand V height is 30.6 mm, the fan width is 33.92 mm, the conductor outer layer pitch is 385 mm, the pre-twisted pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0064] It should be noted that when stranding, before the copper oxide single wire of the frame stranding machine is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire wheel, and a wire guide roller in the stranding body to protect the oxide layer from damage and shedding. The wire is taken up with an aging tooling reel, and the strand blocks are placed on a single reel. Silicone oil is added when the conductor is taken up. Special dies are used for stranding the split strands, with a fan-shaped die for the inner layer and a tile-shaped die for the outer layer. The speed is controlled at 15m / min during the stranding process. S6. Cabling: The center filler core and the split conductor blocks are cabled together, with the outer diameter of the cable controlled at 61.2 mm. Corrugated paper tape is placed between adjacent split conductor blocks.

[0065] S7. Wrapping with semi-conductive tape: After cabling, wrap two layers of semi-conductive Tetoron tape around the conductor. The overlap rate of the semi-conductive tape is 45%, and the winding direction is right-hand. The outer diameter of the conductor after wrapping is controlled at 62.6mm.

[0066] Example 4 A production process for an oxidized conductor, characterized by comprising the following steps: S1. Copper Wire Drawing: Copper rods are drawn into copper wires, producing three diameters: 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm. The diameter of the central filler copper wire is 2.60mm-2.61mm; the diameter of the inner copper wire of the split strand 2 is 2.77mm-2.78mm, and the diameter of the outer copper wire of the split strand is 2.74mm-2.75mm.

[0067] The outer copper wires of the split strand refer to the copper wires surrounding the fan-shaped periphery of the split strand. The copper wires used in the split strand beyond the outer copper wires are called the inner copper wires. It is important to note that the gas shielding device in the continuous softening unit of the wire drawing machine can be omitted during the wire drawing process. Annealing in the continuous softening unit is performed at a voltage of 45V and a line speed of 500m / min.

[0068] S2. Spraying strong oxidant solution: After the copper wire exits the continuous softening machine, spray a strong oxidant solution onto the surface of the copper wire while the copper wire is running normally. The pressure is controlled at 0.2 MPa. The strong oxidant solutions used include 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 and ammonium persulfate solution is 1:1.

[0069] S3. Copper wire annealing: The copper wire sprayed with a strong oxidant was annealed and oxidized in an aging furnace at a temperature of 150° C., a heating time of 2 hours, and a holding time of 3 hours to obtain copper oxide. The average thickness of the copper oxide film was measured to be 2.2 μm.

[0070] S4. Center filling core twisting: Copper oxide single wires with a diameter of 2.60mm-2.61mm are twisted into a center filling core. The center filling core adopts a 1+6+12 / 2.60mm structure, the outer layer twist direction is left-hand, 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 payoff reel used on the frame stranding machine is a 630 tooling reel. Before the copper oxide single wire is loaded onto the machine for production, the stranding machine uses a nylon threading nozzle, wire pulley, and wire guide rollers inside the stranding body to protect the oxide layer from damage and shedding. The machine speed is controlled at 25m / min during the stranding process.

[0072] S5. Stranding of split strand conductors: Twist annealed multiple round copper wires (the diameter of the inner copper wire of the split strand is 2.77 mm-2.78 mm, and the diameter of the outer copper wire of the split strand is 2.74 mm-2.75 mm) into split strands. The twisted structure of the oxidized split strand is 91 / 2.73 mm. The twisting direction of each strand is left-handed. The strand V height is 30.6 mm, the fan width is 33.9 mm, the conductor outer layer pitch is 380 mm, the pre-twisted pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0073] It should be noted that when stranding, before the copper oxide single wire of the frame stranding machine is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire wheel, and a wire guide roller in the stranding body to protect the oxide layer from damage and shedding. The wire is taken up with an aging tooling reel, and the strand blocks are placed on a single reel. Silicone oil is added when the conductor is taken up. Special dies are used for stranding the split strands, with a fan-shaped die for the inner layer and a tile-shaped die for the outer layer. The speed is controlled at 15m / min during the stranding process. S6. Cabling: The center filler core and the split conductor blocks are cabled together, with the outer diameter of the cable controlled at 61.2 mm. Corrugated paper tape is placed between adjacent split conductor blocks.

[0074] S7. Wrapping with semi-conductive tape: After cabling, wrap two layers of semi-conductive Tetoron tape around the conductor. The overlap rate of the semi-conductive tape is 45%, and the winding direction is right-hand. The outer diameter of the conductor after wrapping is controlled at 62.6mm.

[0075] Example 5 A production process for an oxidized conductor, characterized by comprising the following steps: S1. Copper Wire Drawing: Copper rods are drawn into copper wires, producing three diameters: 2.60mm-2.61mm, 2.77mm-2.78mm, and 2.74mm-2.75mm. The diameter of the central filler copper wire is 2.60mm-2.61mm; the diameter of the inner copper wire of the split strand 2 is 2.77mm-2.78mm, and the diameter of the outer copper wire of the split strand is 2.74mm-2.75mm.

[0076] The outer copper wires of the split strand refer to the copper wires surrounding the fan-shaped periphery of the split strand. The copper wires used in the split strand beyond the outer copper wires are called the inner copper wires. It is important to note that the gas shielding device in the continuous softening unit of the wire drawing machine can be omitted during the wire drawing process. Annealing in the continuous softening unit is performed at a voltage of 45V and a line speed of 500m / min.

[0077] S2. Spraying strong oxidant solution: After the copper wire exits the continuous softening machine, spray a strong oxidant solution onto the surface of the copper wire while the copper wire is running normally. The pressure is controlled at 0.2 MPa. The strong oxidant solutions used include 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 and ammonium persulfate solution is 1:1.

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

[0079] S4. Center filling core twisting: Copper oxide single wires with a diameter of 2.60mm-2.61mm are twisted into a center filling core. The center filling core adopts a 1+6+12 / 2.60mm structure, the outer layer twist direction is left-hand, 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 payoff reel used on the frame stranding machine is a 630 tooling reel. Before the copper oxide single wire is loaded onto the machine for production, the stranding machine uses a nylon threading nozzle, wire pulley, and wire guide rollers inside the stranding body to protect the oxide layer from damage and shedding. The machine speed is controlled at 25m / min during the stranding process.

[0081] S5. Stranding of split strand conductors: Twist annealed multiple round copper wires (the diameter of the inner copper wire of the split strand is 2.77 mm-2.78 mm, and the diameter of the outer copper wire of the split strand is 2.74 mm-2.75 mm) into split strands. The twisted structure of the oxidized split strand is 91 / 2.73 mm. The twisting direction of each strand is left-handed. The strand V height is 30.6 mm, the fan width is 33.9 mm, the conductor outer layer pitch is 380 mm, the pre-twisted pitch is 1800 mm, and the conductor cross-section is 478 mm².

[0082] It should be noted that when stranding, before the copper oxide single wire of the frame stranding machine is put into production, the stranding machine should be replaced with a nylon threading nozzle, a wire wheel, and a wire guide roller in the stranding body to protect the oxide layer from damage and shedding. The wire is taken up with an aging tooling reel, and the strand blocks are placed on a single reel. Silicone oil is added when the conductor is taken up. Special dies are used for stranding the split strands, with a fan-shaped die for the inner layer and a tile-shaped die for the outer layer. The speed is controlled at 15m / min during the stranding process. S6. Cabling: The center filler core and the split conductor blocks are cabled together, with the outer diameter of the cable controlled at 61.2 mm. Corrugated paper tape is placed between adjacent split conductor blocks.

[0083] S7. Wrapping with semi-conductive tape: After cabling, wrap two layers of semi-conductive Tetoron tape around the conductor. The overlap rate of the semi-conductive tape is 45%, and the winding direction is right-hand. 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 with 2500mm² conductor).

[0085] Comparative Example 2 The difference from Example 1 is that in step S2, only a sodium hydroxide (NaOH) solution with a concentration of 2.5 mol / L is used for spraying, and the other preparation steps are consistent with Example 1.

[0086] Comparative Example 3 The difference from Example 1 is that in step S2, only ammonium persulfate ((NH4)2S2O8) solution with a concentration of 0.2 mol / L is used for spraying, and the other preparation steps are consistent with Example 1.

[0087] Comparative Example 4 The difference from Example 1 is that in step S2, only a CuSO4 solution with a concentration of 2.5 mol / L is used for spraying, and the other preparation steps are consistent with Example 1.

[0088] Comparative Example 5 The difference from Example 1 is that in step S2, the strong oxidant solution is sprayed with a sodium hydroxide (NaOH) solution having a concentration of 1.0 mol / L and an ammonium persulfate ((NH4)2S2O8) solution having a concentration of 0.5 mol / L, and the volume ratio of the sodium hydroxide and ammonium persulfate solutions is 1:3. The other preparation steps are consistent with Example 1.

[0089] Comparative Example 6 Different from Example 1, steps S2 and S3 are omitted, and the drawn copper wire is directly subjected to oxidation reaction at a temperature of 350° C. to obtain oxidized copper wire. The other preparation steps are consistent with Example 1.

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

[0091] Table 1 Properties of copper oxide conductors

[0092] In Table 1, “ / ” indicates that the test was not performed, and the year-on-year reduction in AC resistance is the reduction rate of AC resistance compared with the conventional conductor of Comparative Example 1.

[0093] As shown in Table 1, the ammonium persulfate ((NH4)2S2O8) in Examples 1 to 5 of the present invention will hydrolyze in water to produce persulfate ions with strong oxidizing properties. Under alkaline conditions (sodium hydroxide solution), the oxidizing properties of the persulfate ions are further enhanced, and copper can be oxidized to copper ions (Cu 2+ ), copper ions and hydroxide ions (OH − ) combines to form copper hydroxide (Cu(OH)2). Further heating and annealing at temperatures above 150°C decomposes the copper hydroxide into black copper oxide (CuO). The copper oxide film thickness on the surface of the oxidized conductor and between the individual copper oxide lines ranges from 2.0 μm to 3.5 μm. Compared to conventional circular conductors (Comparative Example 1), the AC resistance of the oxidized conductor is approximately 20% lower year-on-year.

[0094] In Comparative Example 2, a single sodium hydroxide (NaOH) solution is used to oxidize copper at high temperature, but the oxidizing property is poor. Under the conditions of Comparative Example 2, the oxide layer of the processed single wire is thin.

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

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

[0097] In Comparative Example 5, the concentration of the sodium hydroxide (NaOH) solution is relatively low. When reacting with the copper and ammonium persulfate ((NH4)2S2O8) solution, less copper hydroxide (Cu(OH)2) is generated, resulting in a thinner copper oxide film subsequently generated.

[0098] In Comparative Example 6, the surface of the copper single wire can generate a copper oxide film by reacting with oxygen in the air at high temperature, but the surface thickness of the generated copper oxide film is uneven and the generated 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. Those skilled in the art will readily appreciate that various modifications and variations are possible in the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A process for producing an oxidized conductor, characterized in that: The following steps are involved: S1, drawing the copper rod into copper single wire; S2. Spraying a strong oxidant solution on the surface of the copper wire; S3, annealing the copper wire sprayed with the strong oxidant solution to obtain a copper oxide wire; S4, twisting multiple copper oxide single wires into a central filling core; S5, twisting multiple copper oxide single wires into split strand block conductors; S6, cabling the twisted center filler core and the split strand conductors; S7. After being cabled, the surface of the conductor is covered with a semi-conductive tape to obtain a copper oxide conductor.

2. The process for producing an oxidized conductor according to claim 1, wherein: In step S1, the diameter of the copper single wire is 2.58 mm-2.78 mm.

3. The production process of an oxidized conductor according to claim 1, characterized in that: In step S2, the spraying amount of the strong oxidant solution is controlled by adjusting the line speed of the copper wire, and the line speed of the copper wire is 400 m / min-600 m / min.

4. The process for producing an oxidized conductor according to claim 1, wherein: In step S2, the strong oxidant solution includes a sodium hydroxide solution and an ammonium persulfate solution, 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).

5. The process for producing an oxidized conductor according to claim 1, wherein: In step S3, the annealing temperature is 150° C.-200° C., and the temperature is kept for 3-5 hours. The thickness of the copper oxide film in the copper oxide single wire is 2.0 μm-3.5 μm.

6. The process for producing an oxidized conductor according to claim 1, wherein: In step S4, the central filling core adopts a 1+6+12 / 2.60 mm structure; the stranding speed is 20-30 m / min.

7. The process for producing an oxidized conductor according to claim 1, wherein: In step S5, the stranding speed is controlled at 10-15 m / min; the pitch of the outer layer single wire is controlled at 360 mm-400 mm, the pitch of the cable is controlled at 1770 mm-1830 mm, and the stranding direction of each layer of copper oxide single wire is left-handed; The structure of the split stranded conductor is 91 / 2.73 mm. When the split strands are twisted, the inner layer is pressed with a fan-shaped die and the outer layer is pressed with a tile-shaped die.

8. The process for producing an oxidized conductor according to claim 1, wherein: In step S6, the outer diameter of the cable is 60-62 mm, and a corrugated paper tape is provided between two adjacent divided conductor strand blocks.

9. The process for producing an oxidized conductor according to claim 1, wherein: In step S7, the semi-conductive tape is a terylene tape, the overlap rate of the semi-conductive tape is 40%-50%, the winding direction is right-handed, and the outer diameter of the conductor after wrapping is 61.5-64 mm.

10. An oxidized conductor produced by the production process of an oxidized conductor according to any one of claims 1 to 9, characterized in that: The invention comprises a wire core and a semi-conductive tape coated on the surface of the wire core; the wire core comprises a wire core body and a corrugated paper tape; the wire core body comprises a central filling core and a plurality of fan-shaped segmented strands of the same size and cross-sectional shape twisted together on the cross section around the central filling core; the corrugated paper tape is arranged between two adjacent segmented strands; The wire core body adopts a copper oxide single wire, which includes a copper single wire and a copper oxide film coated on the surface of the copper single wire. The thickness of the copper oxide film is 2.0μm-3.5μm.

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