A segmented conductor for high voltage power cables and a production process

Abstract

The application discloses a split conductor for high-voltage power cable and a production process. The conductor comprises, from inside to outside, a center conductor, five groups of fan-shaped blocks, corrugated insulation paper, an electric field uniform layer and a semi-conductive protective layer. The fan-shaped blocks are layered twisted by soft round copper wires, the outer two layers of the twisted wires are configured with left and right side edge shaping of pressure wheels, the outer three layers are configured with arc shaping of upper and lower normal pressure wheels, the middle part of the side edge of the upper normal pressure wheel is provided with a 0.1-0.2mm arc protrusion, and the arc radius of the lower normal pressure wheel is larger than the design arc radius of the fan-shaped block. The cable is formed by using a three-stage stepped tight pressing and twisting die, and the pre-twist pitch is matched with the cable-forming pitch. The application solves the defects of the existing split conductor, such as serious work hardening, high resistivity, large out-of-roundness and springback distortion of the fan-shaped cross section, the tight pressing coefficient of the conductor reaches 0.84-0.85, the out-of-roundness is less than or equal to 0.6%, the conductor resistivity at 20 DEG C is less than or equal to 17.807 ohm*mm2 / km, and the application is suitable for the production of 1000-2000mm2 large-section high-voltage cable conductors.

Description

Technical Field

[0002] This invention relates to the field of high-voltage power cable conductor manufacturing technology, specifically to a segmented conductor for high-voltage power cables and its manufacturing process, mainly relating to the segmented conductor structure for high-voltage transmission and transformation cables with large cross-sections of 1000-2000 mm². Background Technology

[0004] When the conductor cross-section of a large-section high-voltage power cable is greater than 800 mm², the AC resistance of the conductor is significantly greater than the DC resistance due to the skin effect. Simply increasing the cross-section cannot effectively improve the current carrying capacity. Therefore, the industry generally adopts a segmented conductor structure, dividing the large-section conductor into several mutually insulated sector-shaped strands connected in parallel to weaken the skin effect and reduce the AC resistance.

[0005] The following defects are commonly found in the segmented conductors of existing large-section high-voltage cables: First, to ensure stable forming of the fan-shaped strands, the industry generally uses large-diameter soft round copper single wires. During the fan-shaped stranding and compaction process, the single wire stretching rate can reach over 12%, resulting in severe work hardening of the copper wire, increased AC resistance of the conductor, and increased transmission loss. Simultaneously, the fan-shaped strands are only pressed by upper and lower single pressure rollers, without lateral shaping. This leads to an excessively large arc at the fan apex, insufficient effective fan width, large strand gaps, low overall conductor compaction coefficient, and an excessively large finished product outer diameter. Second, replacing the single wire with a smaller diameter one to reduce tensile deformation will create new forming defects: the peak compressive stress on the sides and center of the arc during fan-shaped compaction, followed by stress rebound expansion after detachment from the pressure rollers, causes distortion of the fan-shaped cross-section, uneven sides, and a significant excess of overall non-roundness in the segmented conductor, directly compromising the forming quality of the subsequent three-layer co-extrusion insulation process.

[0006] Existing technologies, such as CN202134226U, disclose a large-section segmented conductor for high-voltage cables, comprising several fan-shaped strands assembled into a cable, with adjacent strands separated by insulating paper, and surrounded by a semi-conductive tape and a protective tape; CN104575824A discloses a bonded and insulated split-isolation capacity-enhancing high-voltage power cable, with insulating adhesive wrapped around copper conductors; CN103065722A discloses a method for manufacturing ultra-high-voltage cable conductors, using a forming wheel to press the fan-shaped conductors and pre-twist them. However, all of the above-mentioned existing technologies lack lateral shaping tooling, do not have pre-compensation structures for springback stress, and lack a matching parameter system between single-wire specifications, pressing tooling, and cabling molds, making it impossible to simultaneously meet the production requirements of low resistivity and high roundness. This results in high energy consumption and material costs for large-section high-voltage cable conductors. Summary of the Invention

[0008] (a) Purpose of the invention

[0009] The present invention aims to overcome the defects of existing split conductors, such as severe work hardening, high resistivity, fan-shaped springback distortion, poor roundness, and high copper consumption. It provides a high-voltage cable split conductor with low resistance and high roundness, as well as its supporting production process, which takes into account both conductivity and forming accuracy, and reduces transmission loss and raw material consumption.

[0010] (II) Technical Solution

[0011] 1. Divide the overall structure of the conductor

[0012] The present invention comprises, from the inside out, a central conductor, five sets of fan-shaped strands, corrugated insulating paper, an electric field uniform layer, and a semi-conductive protective layer. The five sets of fan-shaped strands, together with the central conductor and the corrugated insulating paper, form a composite conductor.

[0013] (1) Center conductor: The cross-sections of 1000mm², 1200mm², and 1400mm² are made of a single round copper single wire (corresponding to Φ2.76mm, Φ3.19mm, and Φ3.57mm respectively); the cross-sections of 1600mm² and 2000mm² are made of 7 Φ1.71mm copper single wires tightly twisted together, twisted to the left, with a twisting pitch of 77-86mm.

[0014] (2) Sector-shaped strands: All sector-shaped strands are made of soft round copper wires twisted in layers. The cross-section of 1000-1400 mm² is made of 61 soft round copper wires twisted in a regular sector shape; the cross-sections of 1600 mm² and 2000 mm² are made of 91 soft round copper wires twisted in a regular sector shape. The strand compaction coefficient is 0.87-0.88, and the sector angle is 71.5°. The outermost layer of twisting and the pre-twisting direction are both to the left, and the twisting directions of adjacent layers are opposite. The pre-twisting pitch of all sector-shaped strands is completely consistent and cannot be adjusted during the production process.

[0015] (3) Wrinkled insulating paper: five sheets in total, with a thickness of 0.1 mm and a width that increases with the cross-section. They cover the top and sides of each sector block, separating the five groups of sector blocks and dividing adjacent sector blocks.

[0016] (4) Composite conductor: Five sets of fan-shaped strands are cabled together with the center conductor and the corrugated insulation paper in the left direction. The ratio of the cable pitch to the pre-twist pitch of the fan-shaped strands is 1:1. The fan angle of the fan-shaped strands is 71.5°. The compression coefficient is 0.84 to 0.85. The roundness of the finished product is ≤0.6%.

[0017] (5) Outer layer structure: Semi-conductive nylon tapes are overlapped and wrapped to form a uniform electric field layer, and the outer layer is then overlapped and wrapped with protective tape to form a semi-conductive protective layer.

[0018] Furthermore, the conductor resistance of the formed segmented conductor at 20°C satisfies the following conditions: 1000mm²≤0.0176Ω / km, 1200mm²≤0.0151Ω / km, 1400mm²≤0.0129Ω / km, 1600mm²≤0.0113Ω / km, and 2000mm²≤0.0090Ω / km.

[0019] 2. Supporting production processes

[0020] Step 1: Use a continuous drawing and undrawing wire drawing machine to prepare soft round copper single wires. Match the single wire diameter to the cable cross-section, and control the single wire diameter tolerance within ±0.005mm.

[0021] Step 2: Stranding to prepare the center conductor. For cross-sections of 1600mm² and 2000mm², a stranding structure of 7 Φ1.71mm copper single wires is used, with the stranding pitch controlled at 77-86mm, and the stranding is done in the left direction.

[0022] Step 3: The frame-type stranding machine strands the strands into fan-shaped blocks. The outermost two layers of the stranded wire are shaped by left and right pressure rollers, with an included angle of 71.5° between their sides. Chamfers are added to both ends of the fan shape. The outermost three layers of the stranded wire are shaped by upper and lower positive pressure rollers for arc shaping. The radius of the arc of the lower positive pressure roller is 0.3–0.7 mm larger than the designed arc radius of the fan shape to counteract stress rebound. The upper positive pressure roller has a 0.1–0.2 mm arc protrusion in the middle of its side to precisely compensate for pressure rebound. The pre-twist pitch of all fan-shaped strands remains constant.

[0023] Step 4: The disc-type cabling machine assembles a three-stage graded compaction and paralleling die to complete the cabling of the composite conductor. The cabling direction is left-handed, and the ratio of the cabling pitch to the pre-twist pitch of the fan-shaped strands is 1:1. The paralleling die is divided into a merging die, a forming die, and a shaping die in sequence. The aperture of the three-stage graded compaction and paralleling die decreases step by step to compact the composite conductor, and the outer diameter tolerance is controlled within ±0.2mm.

[0024] Step 5: Overlap semi-conductive nylon tape is wrapped around the outer layer of the composite conductor to form a uniform electric field layer, and then overlap and wrap protective tape to form a semi-conductive protective layer.

[0025] Furthermore, in step three, the included angle between the sides of the upper and lower positive pressure rollers is 71.5°, and the top chamfer matches the specifications of each cross section.

[0026] Furthermore, in step three, when the fan-shaped strands are twisted, the outer layer is to the left, the adjacent layers are in opposite directions, and the pre-twisting direction is uniformly to the left.

[0027] 3. Beneficial effects

[0028] (1) The use of finely divided small-diameter copper single wires significantly reduces the tensile deformation of the single wires and weakens work hardening. According to actual measurements, the resistivity of the finished product conductor at 20℃ is reduced by more than 0.75% compared with conventional products, which significantly weakens the skin effect and reduces transmission loss.

[0029] (2) The side pressure roller is combined with the upper and lower positive pressure rollers for pressing. The upper positive pressure roller's arc protrusion and the lower positive pressure roller's enlarged arc provide double compensation for stress rebound. The fan-shaped side is straight and the arc size is precisely controllable. The non-roundness of the composite conductor is reduced to less than 0.6%, which is perfectly adapted to the three-layer co-extrusion process.

[0030] (3) The pre-twist pitch of the fan-shaped strand is precisely matched with the cable pitch. The three-stage mold is graded and compacted, the compaction coefficient of the split conductor is increased by more than 2.5%, the internal gap is reduced, and the copper consumption per unit length is reduced.

[0031] (4) The center conductor adopts the general standard specifications, reducing spare parts inventory. The entire process is equipped with standardized process parameters, resulting in high production stability and covering the production of a full range of large cross-section high voltage cable conductors from 1000 to 2000 mm². Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall cross-section of the segmented conductor of the present invention, labeled with the central conductor (110), the sector-shaped strands (120), the wrinkled insulating paper (130), the electric field uniform layer (200), and the semi-conductive protective layer (300).

[0034] Figure 2 This is a schematic diagram of the forming fixture for the fan-shaped strand, indicating the assembly and pressing positions of the left pressure roller (a), the right pressure roller (b), and the fan-shaped strand (e), and the side clamping angle (A). c ), sector height (H) c ), chamfer at both ends (r) c ), radius of the arc (R) c );

[0035] Figure 3 This is a schematic diagram of the forming fixture for the fan-shaped strand, indicating the assembly and pressing positions of the upper pressure roller (c), lower pressure roller (d), and fan-shaped strand (f), and the side clamping angle (A). Z ), width (B) c ), top chamfer (r) z ), height of the arc protrusion (h) z ), radius of the arc (R) z ). Detailed Implementation

[0037] This invention provides five embodiments of high-voltage cable conductor segmentation with dimensions of 1000mm², 1200mm², 1400mm², 1600mm², and 2000mm². Each embodiment follows a unified process logic and only matches the corresponding specification parameters.

[0038] Example 1: 1×1000mm² high-voltage cable split conductor

[0039] 1) Single wire preparation: The center conductor uses Φ2.76mm copper single wire (tolerance 2.75~2.77mm); the fan-shaped strands use Φ2.17mm copper single wire (tolerance 2.165~2.175mm), and continuous drawing and annealing are used to eliminate drawing stress.

[0040] 2) Center conductor: A single Φ2.76mm copper wire is used directly as the center support conductor.

[0041] 3) Preparation of fan-shaped strands: 61 Φ2.17mm single wires are twisted in 1+6 layers, with the outer layer to the left and adjacent layers to the opposite direction; the pre-twist pitch is 1100mm, pre-twist to the left. Tooling configuration: The included angle (A) between the sides of the outer layer side pressure rollers (a) and (b) c 71.5°, sector height (H) c 17.8mm, chamfered at both ends (r) c 1.5°, radius of the arc (R) c 20.3mm; Second layer side pressure roller (a) and (b) fan-shaped height (H) c 13.7mm, chamfer (r) c 1.5°, radius of the arc (R) c 19.6mm. Side angle (A) of the upper positive pressure roller (c). z 71.5°, width (B) z 21.6mm, top chamfer (r) z ) 1.4°, with a 0.1-0.2mm arc protrusion at the center of the side (h) c ); Radius of the lower positive pressure roller (d) arc (R) z 20.0mm. The width of the positive pressure rollers in the second and third layers decreases progressively (B). z ) and radius of the arc (R) z Finally, the weighing cross-sectional area of ​​the sector block (f) between the upper and lower positive pressure rollers is controlled at 201.5-202.7 mm², and the sector angle is 71.5°.

[0042] 4) Composite conductor cabling: Five fan-shaped strands are paired with five 0.1mm×35mm corrugated insulating papers, cabled from left to right, with a cabling pitch of 1100mm. Three-section paralleling mold: merging mold 40.2~40.6mm, forming mold 39.4~39.8mm, and shaping mold 38.8~39.2mm. Finished product outer diameter 39.0±0.2mm, conductor resistance ≤0.0176Ω / km at 20℃, and out-of-roundness ≤0.6%.

[0043] 5) Outer wrapping: Semi-conductive nylon tape is overlapped and wrapped to form a uniform electric field layer, and outer protective tape is overlapped and wrapped to form a semi-conductive protective layer.

[0044] Example 2: 1×1200mm² high-voltage cable split conductor

[0045] 1) Single line parameters: center single line Φ3.19mm (tolerance 3.18~3.20mm), fan-shaped single line Φ2.34mm (tolerance 2.335~2.345mm).

[0046] 2) The center conductor uses a single Φ3.19mm copper wire; the fan-shaped strands are composed of 61 Φ2.34mm single wires twisted together, with a pre-twist pitch of 1190mm. The outer fan-shaped height (H) of the side pressure rollers (a) and (b) c 19.2mm, chamfer (r) c 1.6°, radius of the arc (R) c 21.9mm; Height (H) of the second layer side pressure rollers (a) and (b) c 14.8mm, radius of curvature (R) c 20.9mm. The upper positive pressure roller (c) has a 0.1-0.2mm arc-shaped protrusion (h) at the center of its side. z ), top chamfer (r) z 1.6°.

[0047] 3) The cabling uses 0.1mm×38mm corrugated insulation paper, with a cabling pitch of 1190mm. Three-section parallel-wire mold: 43.4~43.8mm / 42.6~43.0mm / 42.0~42.4mm. Finished product outer diameter 42.2±0.2mm, conductor resistance ≤0.0151Ω / km at 20℃.

[0048] Example 3: 1×1400mm² high-voltage cable split conductor

[0049] 1) Single-wire parameters: center single wire Φ3.57mm, fan-shaped single wire Φ2.53mm. The fan-shaped strand is composed of 61 single wires twisted together, with a pre-twist pitch of 1280mm.

[0050] 2) Height of the outer fan-shaped section of the side pressure wheel (H) c 20.8mm, chamfer (r) c1.8°, radius of the arc (R) c 23.7mm; Second layer height (H) c 16.0mm, radius of curvature (R) c 22.3mm. Chamfer (r) at the top of the upper positive pressure roller (c). z 1.8°, with a 0.1-0.2mm arc protrusion (h) in the middle of the side. z ).

[0051] 3) The specifications of the corrugated insulation paper are 0.1mm × 41mm, and the cabling pitch is 1280mm. Three-section parallel winding mold: 46.8~47.2mm / 46.0~46.4mm / 45.4~45.8mm. The outer diameter of the finished product is 45.6±0.2mm, and the conductor resistance at 20℃ is ≤0.0129Ω / km.

[0052] Example 4: 1×1600mm² high-voltage cable split conductor

[0053] 1) Single-wire parameters: The center conductor uses 7 Φ1.71mm copper single wires (tolerance 1.705~1.715mm), and the sector single wires are Φ2.21mm. The sector strands are made of 91 single wires twisted together, with a pre-twist pitch of 1370mm.

[0054] 2) The center conductor adopts a 1+6 stranded structure with a pitch of 77–86 mm, left-hand stranding, and an outer diameter of 4.7–4.9 mm. The outer fan-shaped height (H) of the side pressure rollers (a) and (b) c 22.2mm, chamfer (r) c 1.5°, radius of the arc (R) c 25.3mm; Second layer height (H) c 16.8mm, radius of curvature (R) c 24.6mm. Chamfer (r) at the top of the upper positive pressure roller (c). z ) 2.4°, with a 0.1-0.2mm arc protrusion at the center of the side (h) z ).

[0055] 3) The specifications of the corrugated insulation paper are 0.1mm × 44mm, and the cabling pitch is 1370mm. Three-section parallel winding mold: 50.2~50.6mm / 49.4~49.8mm / 48.8~49.2mm. The outer diameter of the finished product is 48.8±0.2mm, and the conductor resistance at 20℃ is ≤0.0113Ω / km.

[0056] Example 5: 1×2000mm² high-voltage cable split conductor

[0057] 1) Single-wire parameters: The center conductor consists of 7 strands of Φ1.71mm copper single wires, and the fan-shaped single wires are Φ2.48mm. The fan-shaped strands are composed of 91 strands of single wires, with a pre-twist pitch of 1530mm.

[0058] 2) Height of the outer fan-shaped side pressure rollers (a) and (b) c 25.0mm, chamfer (r) c 1.7°, radius of the arc (R) c 28.0mm; Second layer height (H) c 18.9mm, radius of curvature (R) c 27.2mm. Chamfer (r) at the top of the upper positive pressure roller (c). z ) 2.4°, with a 0.1-0.2mm arc protrusion at the center of the side (h) z ).

[0059] 3) The specifications for the corrugated insulation paper are 0.1mm × 47mm, and the cabling pitch is 1530mm. Three-section parallel winding molds: 55.8~56.2mm / 55.0~55.4mm / 54.4~54.8mm. The finished product outer diameter is 54.6±0.2mm, and the conductor resistance at 20℃ is ≤0.0090Ω / km.

[0060] Key points for unified production control across all specifications:

[0061] (1) The pre-twist pitch of the five sets of fan-shaped strands is locked throughout the process and cannot be adjusted during production to ensure that the ratio of the cable pitch to the pre-twist pitch is strictly maintained at 1:1.

[0062] (2) The included angle of the sides of the side pressure rollers (a) and (b), the upper positive pressure roller (c) and the lower positive pressure roller (d) is uniformly 71.5°, which matches the fan-shaped angle. The 0.1 to 0.2 mm arc protrusion height in the middle of the side of the upper positive pressure roller (c) is the core structure for springback compensation and cannot be omitted; the arc radius of the lower positive pressure roller (d) is 0.3 to 0.7 mm larger than the fan-shaped arc radius of the product design, so as to offset the stress springback in advance.

[0063] (3) The three-section parallel mold is pressed step by step, and single mold one-time molding is prohibited to prevent the conductor single wire from being squeezed and misaligned, and the roundness deteriorated. The 71.5° fan-shaped strand is pressed into 72.0° to form an overall 360° complete circle.

[0064] (4) The wrinkled insulating paper completely covers the top and sides of the fan-shaped strands to ensure electrical isolation of each fan-shaped strand and suppress the skin effect.

[0065] (5) The outer semi-conductive nylon tape and protective tape are wrapped in overlapping layers, with no missing or broken tapes, to ensure uniform electric field and insulation protection.

[0066] This embodiment employs finely segmented, small-diameter soft round copper single wires, combined with side pressure rollers and upper and lower positive pressure rollers for composite shaping, and a three-stage graded compaction mold, completely resolving the defects of traditional conductors such as work hardening, cross-sectional springback distortion, excessive non-roundness, and high copper loss. The non-roundness of conductors of various specifications is stably controlled within 0.6%, and the conductor resistivity is significantly better than existing products, making it suitable for mass production of 110kV and above large-section high-voltage power cables.

[0067] The above provides a detailed description of the split conductor for high-voltage power cables and its manufacturing process provided by the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. It should be understood that the above embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements or combinations made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A split conductor for high-voltage power cables, characterized in that: The system comprises a center conductor, five sets of sector-shaped strands, five sheets of corrugated insulating paper, a composite conductor, an electric field homogenizing layer, and a semi-conductive protective layer. Each sector-shaped strand is formed by layering soft round copper wire, with all strands having a uniform pre-twist pitch. The composite conductor is formed by left-hand cabling of the center conductor, five sets of sector-shaped strands, and corrugated insulating paper. The corrugated insulating paper covers the apex and sides of the sector-shaped strands and separates adjacent strands. The electric field homogenizing layer is an overlapping wrapping layer of semi-conductive nylon tape, and the semi-conductive protective layer is an overlapping wrapping layer of protective tape. The composite conductor has a compression coefficient of 0.84–0.85 and a roundness ≤0.6%.

2. A split conductor for a high-voltage power cable according to claim 1, characterized in that: The center conductors with cross-sections of 1000mm², 1200mm², and 1400mm² are made of a single round copper wire, while the center conductors with cross-sections of 1600mm² and 2000mm² are made of seven Φ1.71mm copper wires tightly twisted together. The fan-shaped strands with cross-sections of 1000-1400mm² are made of 61 soft round copper wires twisted in a regular fan shape, while the fan-shaped strands with cross-sections of 1600mm² and 2000mm² are made of 91 soft round copper wires twisted in a regular fan shape. The compaction coefficient of the fan-shaped strands is 0.87-0.88, and the outer strand and pre-twist are both left-handed, with adjacent strands twisted in opposite directions.

3. A split conductor for a high-voltage power cable according to claim 1, characterized in that: The ratio of the cabling pitch of the composite conductor to the pre-twist pitch of the sector strand is 1:1, and the sector angle of the sector strand is 71.5°.

4. A split conductor for a high-voltage power cable according to claim 2, characterized in that: The conductor resistance of the segmented conductor at 20°C satisfies the following conditions: 1000mm²≤0.0176Ω / km, 1200mm²≤0.0151Ω / km, 1400mm²≤0.0129Ω / km, 1600mm²≤0.0113Ω / km, 2000mm²≤0.0090Ω / km.

5. A split conductor for a high-voltage power cable according to claim 1, characterized in that: The thickness of the wrinkled insulating paper is 0.1 mm, and the width increases with the increase of the cross-section.

6. A manufacturing process for split conductors in high-voltage power cables, used to prepare split conductors according to any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Use a continuous drawing and undrawing wire drawing machine to prepare soft round copper single wires, and match the corresponding single wire diameter according to the cable cross-section. The single wire diameter tolerance is controlled within ±0.005mm. Step 2: Stranding to prepare the center conductor. For cross-sections of 1600mm² and 2000mm², a stranding structure of 7 Φ1.71mm copper single wires is used, with the stranding pitch controlled at 77-86mm, and the stranding is done in the left direction. Step 3: Use a frame-type stranding machine to strand fan-shaped strands. The outermost two layers of stranded wire are shaped by left and right pressure rollers, with an included angle of 71.5° between the sides of the left and right pressure rollers. Chamfers are provided at both ends of the fan shape. The outermost three layers of stranded wire are shaped by upper and lower positive pressure rollers for arc shaping. The arc radius of the lower positive pressure roller is 0.3-0.7mm larger than the designed arc radius of the fan shape. The upper positive pressure roller has an arc protrusion of 0.1-0.2mm in the middle of its side. The pre-twist pitch of all fan-shaped strands remains constant. Step 4: Use a disc-type cabling machine to assemble a three-stage graded compaction and paralleling die to complete the cabling of the composite conductor. The cabling direction is left-handed, and the ratio of the cabling pitch to the pre-twist pitch of the fan-shaped strand is 1:

1. The paralleling die is divided into a merging die, a forming die, and a shaping die in sequence, with the aperture of the three dies decreasing step by step. Step 5: Overlap semi-conductive nylon tape is wrapped around the outer layer of the composite conductor to form a uniform electric field layer, and then overlap and wrap protective tape to form a semi-conductive protective layer.

7. The manufacturing process for a split conductor for a high-voltage power cable according to claim 6, characterized in that: In step three, the included angle between the sides of the upper and lower positive pressure rollers is 71.5°, and the top chamfer matches the specifications of each cross section.

8. The manufacturing process for a split conductor for a high-voltage power cable according to claim 6, characterized in that: In step four, the aperture of the three-stage graded compaction and paralleling die decreases step by step, and the outer diameter tolerance of the composite conductor after cabling is controlled within ±0.2mm.

9. The manufacturing process for a split conductor for a high-voltage power cable according to claim 6, characterized in that: In step three, when the fan-shaped strands are twisted, the outer layer is to the left, the adjacent layers are in opposite directions, and the pre-twisting direction is uniformly to the left.

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