10KV photoelectric composite shore power cable and manufacturing method thereof

Abstract

The invention discloses a 10KV photoelectric composite shore power cable, which comprises three groups of power wire cores, monitoring wire cores inserted between adjacent power wire cores and used for signal control or communication in a system, an optical fiber unit for controlling optical signal transmission in the system, and a group of standby wire cores, the three groups of power wire cores, the monitoring wire core, the optical fiber unit and the standby wire core are twisted into a cable by adopting a 3 + 3 structure; a fan-shaped gap after cabling is filled with the tensile fan-shaped supporting frame, and a plurality of strands of stranded tensile steel wire ropes are arranged in the tensile fan-shaped supporting frame. A 3 + 3 structure is twisted to form a cable and a tensile support, so that the tensile strength is greatly improved; the power wire core structure ensures flexibility and durability; the three-layer co-extrusion insulation design improves the insulation performance; a monitoring wire core and an optical fiber unit are integrated to realize stable transmission of power and communication signals; and the environment-resistant performance is enhanced by the double outer protective layers.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a 10KV photoelectric composite shore power cable and a manufacturing method thereof. Background Art

[0002] Shore power cable refers to a special cable used to connect the shore power supply to the ship when the ship is docked. It provides power and communication signals to the docked ship, realizing the shore power access and communication functions of the ship. The port environment is relatively harsh, and the shore power cable needs to have good environmental resistance, including high temperature resistance, low temperature resistance, moisture resistance, salt spray resistance, UV resistance and other characteristics. Shore power cables need to be frequently wound and unwound during use, so they need to have good flexibility. At the same time, in order to prevent the cable from being broken during operation, it also needs to have a certain tensile strength.

[0003] 10kV photoelectric composite shore power cable is a composite cable that integrates optical fiber and copper cable, and is used to transmit optical signals and power at the same time. It integrates optical fiber and power transmission copper wire, and can solve the problems of terminal access, equipment power consumption, and signal transmission. It is a new access method. This cable has the advantages of high-speed transmission, anti-interference, space saving, and convenient maintenance. It is particularly suitable for occasions where power and communication signals need to be transmitted simultaneously.

[0004] However, due to the high voltage level, the outer diameter and self-weight of this type of cable are significantly increased compared to conventional cables, which puts more stringent requirements on the load-bearing and tensile properties of the cable. At present, how to effectively reduce the weight and improve the load-bearing and tensile properties while ensuring the high performance of the cable has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] Technical problem to be solved by the invention: The purpose of the present invention is to overcome the above-mentioned defects in the weight, load-bearing and tensile resistance of 10kV photoelectric composite shore power cables in the prior art, and to provide a 10KV photoelectric composite shore power cable and a manufacturing method thereof.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the technical solution provided by the present invention is: a 10KV optoelectronic composite shore power cable, comprising 3 groups of power cores and 1 group of monitoring cores interspersed between adjacent power cores for signal control or communication functions in the system, and 1 group of optical fiber units for optical signal transmission in the control system, and 1 group of spare cores. The 3 groups of power cores, 1 group of monitoring cores, 1 group of optical fiber units and 1 group of spare cores are twisted into a cable using a 3+3 structure; the fan-shaped gap after the cabling is filled by a tensile fan-shaped support frame, and the tensile fan-shaped support frame has multiple strands of twisted tensile steel wire ropes.

[0007] As a further improvement of the present invention, a high-strength galvanized steel wire and aramid yarn mixed braided reinforcement layer is arranged outside the cable core, and its braiding density is not less than 90%.

[0008] As a further improvement of the present invention, the power line core includes a power line core conductor formed by twisting tinned copper wires, and the power line core conductor is twisted by a process of bundle twisting and then re-twisting.

[0009] As a further improvement of the present invention, the conductor is wrapped with a semi-conductive isolation tape, and the overlapping rate is not less than 15%.

[0010] As a further improvement of the present invention, a semiconductive conductor shielding layer, an insulating layer and a semiconductive insulating shielding layer are sequentially arranged outside the semiconductive isolation belt, and the semiconductive conductor shielding layer, the insulating layer and the semiconductive insulating shielding layer are tightly extruded on the surface of the semiconductive isolation belt in a three-layer co-extrusion manner by a Telester steam-sulfurized rubber extruder to obtain the main line core.

[0011] As a further improvement of the present invention, the insulating layer is made of EPDM rubber material, the average thickness of the insulating layer is not less than 4.5 mm, the thinnest point is not less than 90% of the average thickness, and the eccentricity is not greater than 5%.

[0012] As a further improvement of the present invention, a metal shielding layer is arranged outside the semi-conductive insulating shielding layer, and the metal shielding layer is braided by mixing tinned copper wire and high-strength aramid yarn.

[0013] As a further improvement of the present invention, the monitoring core includes a monitoring core conductor, and a monitoring core insulation layer and a monitoring core shielding layer which are sequentially arranged outside the monitoring core conductor.

[0014] As a further improvement of the present invention, a double-layer outer protective layer structure is extruded outside the reinforcement layer, wherein the inner layer of the outer protective layer adopts a polyurethane sheath, and the outer layer of the outer protective layer adopts a radiation cross-linked polyolefin sheath.

[0015] The present invention also provides a method for manufacturing a 10KV photoelectric composite shore power cable, comprising the following steps:

[0016] S1. Power line core preparation:

[0017] 1.1. The power line core is made of multiple strands of tinned copper wire, which are first bundled and then re-twisted to control the tension and ensure the quality of the stranded wire. The pitch diameter ratio of the strands is not more than 10 times when bundled and the pitch diameter ratio is controlled to be no more than 6 times when re-twisted. The twist directions of adjacent layers are opposite, and the outermost layer is twisted to the right;

[0018] 1.2. A semi-conductive isolation tape is wrapped around the power line core conductor, and a semi-conductive conductor shielding layer is arranged outside the semi-conductive isolation tape;

[0019] 1.3. Extruded EPDM insulation layer on the semi-conductive conductor shielding layer, controlling thickness, thinnest point and eccentricity;

[0020] 1.4. A semi-conductive insulating shielding layer is provided outside the insulating layer;

[0021] 1.5. The semi-conductive conductor shielding layer, the insulating layer and the semi-conductive insulating shielding layer are tightly extruded on the surface of the semi-conductive isolation belt by a three-layer co-extrusion method through a Telester steam continuous sulfur rubber extruder to obtain the main power line core;

[0022] S2. Monitoring core assembly:

[0023] 2.1. The monitoring wire core conductor is extruded with a monitoring wire core insulation layer, which is vulcanized at high temperature and high pressure;

[0024] 2.2. The monitoring wire core insulation layer is braided with tinned copper wire to form the monitoring wire core shielding layer, and the braiding density is controlled to be no less than 80%;

[0025] S3. Wire core twisted into cable:

[0026] 3.1. Twist three groups of power cores, monitoring cores, optical fiber units and spare cores into a 3+3 structure;

[0027] 3.2. Use tensile fan-shaped support frames and tensile steel wire ropes to fill the fan-shaped gaps of the cables;

[0028] 3.2. Control the cable tension to ensure that the cable cores are arranged neatly;

[0029] S4. Enhanced layer settings:

[0030] 4.1. A mixed reinforcement layer of high-strength galvanized steel wire and high-strength aramid yarn is braided outside the cable core, with a braiding density of not less than 90%;

[0031] 4.2. Control the braiding tension to ensure that the metal wire fits tightly;

[0032] S5. Extrusion of outer sheath:

[0033] 5.1. A double outer sheath is extruded outside the reinforcement layer, the inner layer of the outer sheath is a polyurethane sheath, and the average thickness of the extrusion is not less than 2.0mm;

[0034] 5.2. Outer sheath The outer layer is a radiation cross-linked polyolefin sheath with an average extruded thickness of not less than 3.0 mm.

[0035] As a further improvement of the present invention

[0036] Beneficial Effects

[0037] 1. Enhanced tensile performance: The cable is twisted into a 3+3 structure, and the gaps between the cables are filled with a tensile fan-shaped support frame (containing multiple strands of tensile steel wire ropes), as well as a high-strength galvanized steel wire and aramid yarn mixed braided reinforcement layer, which significantly improves the tensile strength of the cable. This design is particularly suitable for 10kV photovoltaic composite shore power cables, which have higher requirements for tensile resistance due to their high voltage level, large outer diameter and deadweight.

[0038] 2. Excellent flexibility and durability: The power cable core adopts a multi-strand twisted tinned copper wire structure that meets the national military standards of the People's Republic of China, and the cable is twisted first and then twisted again to ensure the flexibility and stability of the cable when it is frequently bent. This structure makes the conductor single wire evenly stressed, and each wire core can slide relative to each other, effectively preventing the conductor from breaking due to bending, thereby greatly improving the durability and reliability of the cable.

[0039] 3. Reliable insulation performance: The conductor is wrapped with a semi-conductive isolation tape, and a semi-conductive conductor shielding layer and a semi-conductive insulation shielding layer are set. Through three-layer co-extrusion, they are tightly extruded on the surface of the semi-conductive isolation tape, which effectively eliminates the air gap between the conductor and the insulation layer, prevents the occurrence of air gap discharge, and significantly improves the insulation performance of the cable.

[0040] 4. Good signal transmission and communication functions: The cable is interspersed with monitoring wire cores for signal control or communication functions in the system and optical fiber units for optical signal transmission in the system, ensuring the stable transmission of power and communication signals.

[0041] 5. Strengthened protective layer design: The reinforcement layer is extruded with a double outer sheath structure, including a polyurethane sheath and a radiation cross-linked polyolefin sheath, which provides additional protection and enhances the environmental resistance of the cable, such as high temperature resistance, low temperature resistance, moisture resistance, salt spray resistance, UV resistance and other characteristics.

[0042] 6. Efficient production process and quality control: The three-layer co-extrusion is carried out by the Telester steam continuous sulfur rubber extruder, and the SIKORA online deflectometer is used for monitoring and measurement, ensuring the efficiency of cable production and the accuracy of quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of a 10KV photoelectric composite shore power cable of the present invention;

[0044] Explanation of the symbols in the schematic diagram:

[0045] 1-1. Power line core conductor; 1-2. Semi-conductive isolation zone; 1-3 Semi-conductive conductor shielding layer; 1-4. Insulation layer; 1-5 Semi-conductive insulation shielding layer; 1-6 Metal shielding layer; 2-1 Monitoring line core conductor; 2-2 Monitoring line core insulation layer; 2-3 Monitoring line core shielding layer; 3-spare line core; 4-optical fiber unit; 5-wrapping layer; 6-reinforcement layer; 7-1 fan-shaped gap; 7-2 tensile steel wire rope; 8-1 inner layer of outer sheath; 8-2 outer layer of outer sheath. DETAILED DESCRIPTION

[0046] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and specific implementation methods.

[0047] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0049] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0050] A 10kV photoelectric composite shore power cable comprises three groups of power cores tangent to each other, and monitoring cores for signal control or communication functions in the system interspersed between adjacent power cores, optical fiber units for optical signal transmission in the system and a group of spare cores, three groups of power cores and monitoring cores, optical fiber units 4 and spare cores 3 interspersed therein. The three groups of power cores, one group of monitoring cores, one group of spare cores and one group of optical fiber units 4 are twisted into cables in a 3+3 structure, and each core and one group of optical fiber units 4 are placed in a fan-shaped filling groove to fully fill the gaps in the cabling, so that the cable core is rounded, and at the same time, other fan-shaped gaps 7-1 are filled with a tensile fan-shaped support frame, and the tensile fan-shaped support frame has a multi-strand twisted tensile steel wire rope 7-2, which further enhances the tensile performance of the cable and fully fills the cabling gaps, and then a double-layer high-strength non-woven fabric is intermittently wrapped to form a wrapping layer 5, and the wrapping overlap rate is not less than 15%, so that the cable core is rounded.

[0051] A high-strength galvanized steel wire and aramid yarn mixed braided reinforcement layer 6 is arranged outside the rounded cable core, with a braiding density of not less than 90%, to further enhance the tensile performance of the cable. During the braiding process, appropriate tension should be controlled to ensure that the metal wire can fit tightly on the cable surface, while avoiding excessive stretching that may cause the metal wire to break.

[0052] The power core includes a power core conductor 1-1. The power core conductor 1-1 adopts a multi-strand twisted tinned copper wire structure that meets the national military standards of the People's Republic of China. The process of first bundle twisting and then re-twisting is adopted to ensure the flexibility and stability of the cable. When bundle twisting, the pitch diameter ratio of the strands is not more than 10 times to ensure tight twisting. When re-twisting, the pitch diameter ratio is controlled to be no more than 6 times to enhance the stability of the structure, especially the outermost layer is twisted to the right, and the adjacent layers are twisted in opposite directions, which helps to balance the internal stress. During the entire twisting process, the tension must be strictly controlled to ensure that the quality of the stranded wire meets the requirements. This structure can better ensure that the conductor single wire is evenly stressed when the cable is frequently bent, and the cores can slide relative to each other, effectively preventing the conductor from breaking due to bending, thereby greatly improving the durability and reliability of the cable.

[0053] A semi-conductive isolation tape 1-2 is wrapped around the power line core conductor 1-1, with an overlapping rate of not less than 15%. A semi-conductive conductor shielding layer 1-3 is arranged outside the semi-conductive isolation tape 1-2, and an insulating layer 1-4 is arranged outside the semi-conductive conductor shielding layer 1-3. The insulating layer 1-4 is made of EPDM rubber material, with an average thickness of not less than 4.5 mm, a thinnest point of not less than 90% of the average thickness, and an eccentricity of not more than 5%.

[0054] A semi-conductive insulating shielding layer 1-5 is arranged outside the insulating layer 1-4. The average thickness of the semi-conductive insulating shielding layer 1-5 and the semi-conductive conductor shielding layer 1-3 is not less than 0.8 mm. The Sikora online deflectometer is used for monitoring and measurement to strictly control the thinnest point of the insulation and the eccentricity.

[0055] The semiconductive conductor shielding layer 1-3, the insulating layer 1-4 and the semiconductive insulating shielding layer 1-5 are tightly extruded on the surface of the semiconductive isolation belt 1-2 by a Triest steam continuous sulfur rubber extruder in a three-layer co-extrusion manner to obtain the main line core.

[0056] By wrapping the semi-conductive isolation tape 1-2 between the power line core conductor 1-1 and the insulating layer 1-4, the air gap between the conductor and the insulating layer can be eliminated or reduced, the occurrence of air gap discharge can be prevented, and the insulation performance of the cable can be improved.

[0057] A metal shielding layer 1-6 is arranged outside the semi-conductive insulating shielding layer 1-5. The metal shielding layer 1-6 is woven with tinned copper wire and high-strength aramid yarn, which can effectively enhance the tensile strength of the core. The ratio of tinned copper wire to aramid yarn in each braided wire is 3:1, and the coverage density is not less than 90%. The diameter of the tinned copper wire braiding wire is not less than 0.25mm. Appropriate tension should be controlled during the braiding process to ensure that the metal wire can fit closely on the surface of the core and avoid excessive stretching to cause the metal wire to break. The braided metal wire also serves as a ground conductor, and its cross-sectional area is not less than 50% of the main cross-sectional area of ​​the power core.

[0058] The monitoring core includes a monitoring core conductor 2-1, and a monitoring core insulation layer 2-2 and a monitoring core shielding layer 2-3 which are sequentially arranged outside the monitoring core conductor. The monitoring core insulation layer 2-2 is extruded by conventional continuous sulfur wire and is formed by a high temperature and high pressure process of a vulcanization pipeline after extrusion. The extrusion is round and has no pores in the cross section. The insulation concentricity is strictly controlled. The shielding layer of the monitoring core is woven with tinned copper wire, and its braiding density is not less than 80%.

[0059] The reinforcement layer 6 is extruded with a double outer sheath structure, which includes an inner outer sheath layer 8-1 and an outer outer sheath layer 8-2. The inner outer sheath layer 8-1 is a polyurethane sheath with an average extrusion thickness of not less than 2.0 mm, and the outer outer sheath layer 8-2 is a radiation cross-linked polyolefin sheath with an average extrusion thickness of not less than 3.0 mm. The thinnest point of the inner and outer sheaths is strictly controlled to be not less than 90% of the average thickness, and the eccentricity is not greater than 10%.

[0060] The manufacturing method of the above 10KV photoelectric composite shore power cable is as follows:

[0061] 1. Power line core conductor twisting:

[0062] 1. Twist multiple strands of tinned copper wires by first bundling and then re-twisting. When bundling, the pitch diameter ratio of the strands is not more than 10 times, and when re-twisting, the pitch diameter ratio is controlled to be no more than 6 times. The twist directions of adjacent layers are opposite, and the outermost layer is twisted to the right.

[0063] 2. Control the tension during the twisting process to ensure that the quality of the twisted wire meets the requirements.

[0064] 3. Wrap a semi-conductive isolation tape around the power line core conductor, with an overlap rate of no less than 15%.

[0065] 4. A semi-conductive conductor shielding layer is arranged outside the semi-conductive isolation zone, with an average thickness of not less than 0.8 mm.

[0066] 5. An EPDM rubber insulation layer is extruded outside the semi-conductive conductor shielding layer. The average thickness of the insulation layer is not less than 4.5 mm, the thinnest point is not less than 90% of the average thickness, and the eccentricity is not greater than 5%.

[0067] 6. A semi-conductive insulating shielding layer is arranged outside the insulating layer, with an average thickness of not less than 0.8 mm.

[0068] 7. The semi-conductive conductor shielding layer, the insulating layer and the semi-conductive insulating shielding layer are tightly extruded on the surface of the semi-conductive isolation belt in a three-layer co-extrusion manner by the Telester steam continuous sulfur rubber extruder, thereby obtaining the main line core of the power line core.

[0069] 2. Monitoring line core assembly

[0070] 8. Extrude the monitoring wire core conductor with the monitoring wire core insulation layer and form it through the high temperature and high pressure process of the vulcanization pipeline.

[0071] 9. Weave a tinned copper wire shielding layer outside the insulation layer of the monitoring wire core, and the weaving density shall not be less than 80%.

[0072] 3. Wire core assembly

[0073] 10. Place the three groups of power cores tangent to each other in pairs, and insert monitoring cores, optical fiber units and spare cores between adjacent power cores.

[0074] 11. Use 3+3 structure to twist the cables, place each wire core in the fan-shaped filling groove, fill the cable gap with a tensile fan-shaped support frame, and fill the tensile fan-shaped support frame with multiple twisted tensile steel wire ropes.

[0075] 12. Control the tension during the cabling process to ensure that the wire cores are arranged neatly and the gaps are fully filled.

[0076] 4. Strengthening layer

[0077] 13. A mixed braided reinforcement layer of high-strength galvanized steel wire and high-strength aramid yarn is arranged outside the rounded cable core, and the braiding density is not less than 90%.

[0078] 14. Control the tension during the weaving process to ensure that the metal wire fits tightly to the cable surface and avoid excessive stretching that may cause the metal wire to break.

[0079] 5. Outer sheath

[0080] 15. A double-layer outer protective layer structure is extruded outside the reinforcement layer, and the inner layer of the outer protective layer adopts a polyurethane sheath, and the average extrusion thickness is not less than 2.0mm.

[0081] 16. The outer sheath is made of radiation cross-linked polyolefin sheath, and the average extrusion thickness is not less than 3.0mm.

[0082] 17. Strictly control the thinnest point of the inner and outer protective layers to be no less than 90% of the average thickness, and the eccentricity to be no more than 10%.

[0083] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A 10KV photoelectric composite shore power cable, characterized in that: The invention comprises three groups of power cores, one group of monitoring cores inserted between adjacent power cores and used for signal control or communication functions in the system, one group of optical fiber units (4) for optical signal transmission in the control system, and one group of spare cores (3). The three groups of power cores, one group of monitoring cores, one group of optical fiber units (4) and one group of spare cores (3) are twisted into a cable using a 3+3 structure; a fan-shaped gap (7-1) after the cable is formed is filled by a tensile fan-shaped support frame, and a plurality of twisted tensile steel wire ropes (7-2) are arranged in the tensile fan-shaped support frame.

2. The 10KV photoelectric composite shore power cable according to claim 1 is characterized in that: A high-strength galvanized steel wire and aramid yarn mixed braided reinforcement layer (6) is arranged outside the cable core, and its braiding density is not less than 90%.

3. The 10KV photoelectric composite shore power cable according to claim 1 is characterized in that: The power line core comprises a power line core conductor (1-1) formed by twisting tinned copper wires. The power line core conductor (1-1) is twisted by a process of bundle twisting and then re-twisting.

4. The 10KV photoelectric composite shore power cable according to claim 3 is characterized in that: The power line core conductor (1-1) is wrapped with a semi-conductive isolation tape (1-2) with an overlapping rate of not less than 15%.

5. The 10KV photoelectric composite shore power cable according to claim 4 is characterized in that: A semiconductive conductor shielding layer (1-3), an insulating layer (1-4) and a semiconductive insulating shielding layer (1-5) are sequentially arranged outside the semiconductive isolation tape (1-2); the semiconductive conductor shielding layer (1-3), the insulating layer (1-4) and the semiconductive insulating shielding layer (1-5) are tightly extruded on the surface of the semiconductive isolation tape (1-2) by a Telest steam continuous sulfur rubber extruder in a three-layer co-extrusion manner, thereby obtaining a main line core.

6. The 10KV photoelectric composite shore power cable according to claim 5, characterized in that: The insulating layer (1-4) is made of ethylene propylene rubber material, the average thickness of the insulating layer (1-4) is not less than 4.5 mm, the thinnest point is not less than 90% of the average thickness, and the eccentricity is not greater than 5%.

7. The 10KV optoelectronic composite shore power cable according to claim 5 is characterized in that a metal shielding layer (1-6) is arranged outside the semi-conductive insulating shielding layer (1-5), and the metal shielding layer (1-6) is braided by mixing tinned copper wire and high-strength aramid yarn.

8. The 10KV photoelectric composite shore power cable according to claim 1 is characterized in that the monitoring core comprises a monitoring core conductor (2-1), and a monitoring core insulation layer (2-2) and a monitoring core shielding layer (2-3) sequentially arranged outside the monitoring core conductor (2-1).

9. The 10KV optoelectronic composite shore power cable according to claim 2 is characterized in that: the reinforcement layer (6) is extruded with a double-layer outer sheath structure, wherein the inner layer (8-1) of the outer sheath is a polyurethane sheath, and the outer layer (8-2) of the outer sheath is a radiation cross-linked polyolefin sheath.

10. A method for manufacturing a 10KV photoelectric composite shore power cable, characterized in that it comprises the following steps: S1. Power line core preparation: 1.

1. The power line core is made of multiple strands of tinned copper wire, which are first bundled and then re-twisted to control the tension and ensure the quality of the stranded wire. The pitch diameter ratio of the strands is not more than 10 times when bundled and the pitch diameter ratio is controlled to be no more than 6 times when re-twisted. The twist directions of adjacent layers are opposite, and the outermost layer is twisted to the right; 1.

2. A semi-conductive isolation tape (1-2) is wrapped around the power line core conductor (1-1), and a semi-conductive conductor shielding layer (1-3) is arranged outside the semi-conductive isolation tape (1-2); 1.

3. Extruding an EPDM rubber insulation layer (1-4) on the semi-conductive conductor shielding layer (1-3), controlling the thickness, the thinnest point and the eccentricity; 1.

4. A semi-conductive insulating shielding layer (1-5) is arranged outside the insulating layer (1-4); 1.

5. The semi-conductive conductor shielding layer (1-3), the insulating layer (1-4) and the semi-conductive insulating shielding layer (1-5) are tightly extruded on the surface of the semi-conductive isolation belt (1-2) by a Triest steam-sulphurized rubber extruder in a three-layer co-extrusion manner to obtain a power line core main line core; S2. Monitoring core assembly: 2.

1. The monitoring wire core conductor (2-1) is extruded with a monitoring wire core insulation layer (2-2) and vulcanized at high temperature and high pressure; 2.

2. The monitoring wire core insulation layer (2-2) is braided with tinned copper wire to form a monitoring wire core shielding layer (2-3), and the braiding density is controlled to be not less than 80%; S3. Wire core twisted into cable: 3.

1. Twist the three groups of power cores, monitoring cores, optical fiber units (4) and spare cores (3) into a 3+3 structure; 3.

2. Use the tensile fan-shaped support frame and the tensile steel wire rope (7-2) to fill the fan-shaped gap (7-1) of the cable; 3.

2. Control the cable tension to ensure that the cable cores are arranged neatly; S4. Enhanced layer settings: 4.

1. A mixed reinforcement layer (6) of high-strength galvanized steel wire and high-strength aramid yarn is braided outside the cable core, with a braiding density of not less than 90%; 4.

2. Control the braiding tension to ensure that the metal wire fits tightly; S5. Extrusion of outer sheath: 5.

1. A double outer protective layer is extruded outside the reinforcement layer, the inner layer of the outer protective layer (8-1) is a polyurethane sheath, and the average thickness of the extrusion is not less than 2.0mm; 5.

2. Outer sheath The outer layer (8-2) is a radiation cross-linked polyolefin sheath with an average extruded thickness of not less than 3.0 mm.

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