High safety performance high voltage cable

Abstract

The application relates to the technical field of cables, and discloses a high-voltage cable with high safety performance. The cable comprises, from inside to outside, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an inner buffer layer, a protective layer, a reinforcing steel cable, an outer buffer layer and an outer protective layer; the protective layer is composed of multiple groups of protective units arranged in an axial array, each protective unit is formed into a circular ring structure by multiple protective sheets arranged in a circumferential direction, the cross section of the protective sheet is in a prismatic shape, the inner and outer walls are in arc shapes, steel cable grooves are arranged on the two sides, and a hollow groove is arranged in the interior; the multiple protective units are staggered and connected to form a continuous spiral winding structure; and the reinforcing steel cable is spirally wound and embedded in the spiral channel formed by the steel cable grooves of the protective sheets. The application realizes uniform conversion and dispersion of axial tension into radial stress, and combines the design of the rhombic protective sheet and the hollow groove, so that the tensile resistance, extrusion resistance, impact resistance and cutting resistance of the cable are significantly improved, and the cable is suitable for complex laying environments.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more particularly to a high-voltage cable with high safety performance. Background Technology

[0002] As a key carrier of power transmission, the safety and reliability of high-voltage cables are directly related to the stable operation of the power system. With the growth of power demand and the increasing complexity of the laying environment, high-voltage cables face increasingly severe challenges, especially when laid overhead, underwater, or across complex terrain, where cables need to withstand greater axial tension, radial compression, and external impact.

[0003] In traditional cable structures, steel wire armor or steel tape armor is typically used as a reinforcing layer to improve the cable's mechanical strength. However, these traditional reinforcing structures have some inherent defects. For example, steel wire armor is prone to stress concentration when subjected to axial tensile force, especially under bending or uneven stress conditions, which may lead to wire breakage or interlayer slippage, thus affecting the overall performance and service life of the cable. Although steel tape armor can provide some radial protection, its tensile strength is relatively limited when subjected to axial tensile force, and it is prone to stress concentration when bending, leading to deformation or even cracking of the armor layer. In addition, traditional armor structures often have difficulty effectively dispersing stress when subjected to external radial compression or impact, which can easily cause damage to the internal insulation layer, thereby triggering partial discharge or even insulation breakdown.

[0004] In the prior art, in order to improve the tensile strength of cables, multiple parallel steel cables are sometimes used as reinforcements. However, when the cable is bent, the steel cables are subjected to uneven stress, which can easily lead to the failure of some steel cables. In order to improve the compressive strength, the thickness of the armor layer is sometimes increased or a harder material is used. However, this will significantly increase the weight and diameter of the cable, which is not conducive to laying and transportation, and the cost is high.

[0005] Therefore, how to design a high-voltage cable structure that can effectively disperse stress and avoid stress concentration when subjected to axial tension, radial compression and external impact, while maintaining the cable's lightweight and flexibility, is a technical problem that urgently needs to be solved in the current cable technology field. Summary of the Invention

[0006] The technical problem to be solved by this invention is that existing technologies are difficult to resist axial tension, radial compression and external impact. To address this, we propose a high-voltage cable with high safety performance.

[0007] To achieve the above objectives, this application adopts the following technical solution: a high-safety high-voltage cable, comprising, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an inner buffer layer, a protective layer, a reinforcing steel cable, an outer buffer layer, and an outer sheath; the protective layer is composed of multiple sets of protective units arranged in an array along the cable axis, each set of protective units being formed by multiple protective plates circumferentially enclosing a circular structure; the radial cross-section of the protective plate is rhomboid, and both its inner and outer walls are arc-shaped, with steel cable grooves extending along its axis on both sides of the protective plate, and hollow grooves extending along its axis inside the protective plate; when multiple protective units are arranged axially, the protective plates in adjacent protective units are staggered in the circumferential direction, and the axially adjacent protective plates are connected to each other, so that multiple sets of protective units together form a continuous spiral winding structure; the reinforcing steel cable consists of multiple strands, each laid in a spiral winding manner, and correspondingly embedded in the spiral channel formed by the steel cable grooves on the spiral winding structure of the protective plate.

[0008] Preferably, the hollowed-out groove is located in the middle area between the two steel cable grooves in the cross-section of the protective sheet, and its cross-sectional area accounts for 20%-50% of the cross-sectional area of ​​the protective sheet.

[0009] Preferably, the perforated groove extends along the axial direction of the protective sheet, and its cross-sectional shape is polygonal, circular, or elliptical, which is used to provide deformation space when the cable is compressed and to reduce the overall weight of the cable.

[0010] Preferably, the cross-section of the steel cable groove is an arc-shaped groove that fits against the outer surface of the reinforcing steel cable, and its depth is not less than 1 / 2 of the radius of the reinforcing steel cable.

[0011] Preferably, the spiral winding pitch of the reinforcing steel cable is the same as the pitch of the spiral winding structure of the protective layer, so as to ensure that the reinforcing steel cable can be fully accommodated in the spiral channel and fit tightly therewith.

[0012] Preferably, the protective sheet is made of high-hardness, high-toughness engineering plastics or fiber-reinforced composite materials. The engineering plastics include nylon, polyoxymethylene or polyetheretherketone, and the fibers in the fiber-reinforced composite materials are glass fibers, carbon fibers or aramid fibers.

[0013] Preferably, the inner and outer buffer layers are made of elastic materials, including at least one of rubber, thermoplastic elastomers or foamed polymers, with a thickness of 0.5 mm to 3 mm.

[0014] Preferably, the outer protective layer is a multi-layer co-extruded composite structure; wherein, the inner layer is a halogen-free flame-retardant polyolefin material; the middle layer is an adhesive waterproof adhesive or a polyethylene blend; and the outer layer is polyvinyl chloride or cross-linked polyethylene with added carbon black or ultraviolet absorbers.

[0015] Preferably, when the cable is laid overhead and subjected to tension, the spiral reinforcing steel cable and the protective layer of the spiral winding structure mesh with each other, uniformly converting the axial tension into radial interaction force, thereby suppressing the radial deformation and axial slippage of the internal structure of the cable.

[0016] This invention provides another embodiment: a method for manufacturing a high-voltage cable with high safety performance, comprising the following steps: S1: sequentially braiding or extruding a conductor shielding layer, an insulation layer, an insulation shielding layer, and an inner buffer layer to form a cable core; S2: positioning multiple protective sheets through a mold, circumferentially enclosing the inner buffer layer and spirally splicing them along the axial direction to form a spirally wound protective layer, wherein the steel cable grooves are aligned during the splicing process to form a continuous spiral channel; S3: during the process of splicing the protective sheets to form the protective layer, multiple reinforcing steel cables are simultaneously spirally wound and embedded in the spiral channel with a pitch matching the spiral channel; S4: sequentially covering the protective layer and the reinforcing steel cables to form an outer buffer layer and an outer sheath.

[0017] The technical effects and advantages of this invention are as follows: In this invention, multiple reinforcing steel cables are laid in a spiral winding manner and precisely embedded within the spiral channel formed by the protective layer. When the cable is subjected to axial tension, the spiral reinforcing steel cables and the spirally wound protective layer mesh with each other, uniformly converting the axial tension into radial interaction force. This suppresses radial deformation and axial slippage of the cable's internal structure, avoiding local stress concentration caused by uneven stress distribution in traditional reinforcing components, and significantly improving the overall tensile strength and structural stability of the cable. The inner and outer walls of the protective plates are both arc-shaped, and multiple protective plates circumferentially enclose each other to form a multi-arched continuous support ring. When the cable is subjected to external radial compression, stress concentration is effectively avoided. Puncture or severe deformation; the inner and outer buffer layers are made of elastic materials to further absorb impact energy and provide additional cushioning protection; the protective sheet has a hollowed-out groove extending along its axis, which provides deformation space to absorb impact while effectively reducing the overall weight of the protective layer, thereby reducing the overall weight of the cable and facilitating cable transportation and laying; the protective sheets in adjacent protective units are staggered in the circumferential direction, and the axially adjacent protective sheets are connected to each other, so that multiple sets of protective units together form a continuous spiral winding structure; the interlayer bonding force is enhanced, preventing relative slippage between structural layers under repeated stretching or vibration conditions, and ensuring the long-term stability of the cable structure. Attached Figure Description

[0018] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the structure of the present invention; Figure 3 This is an exploded view of the overall structure of the present invention; Figure 4 This is a schematic diagram of the protective layer and reinforcing steel cable structure of the present invention; Figure 5 This is an exploded view of the protective layer and reinforcing steel cable structure of the present invention; Figure 6 This is a schematic diagram of the protective sheet, hollow groove, and steel cable groove of the present invention.

[0020] Legend: 1. Conductor; 2. Conductor shielding layer; 3. Insulation layer; 4. Insulation shielding layer; 5. Inner buffer layer; 6. Protective layer; 601. Protective sheet; 602. Hollowed-out groove; 603. Cable groove; 7. Reinforced steel cable; 8. Outer buffer layer; 9. Outer sheath. Detailed Implementation

[0021] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0022] Reference Figures 1-6 As shown, the present invention provides a high-voltage cable with high safety performance. The cable includes, from the inside out, a conductor 1, a conductor shielding layer 2, an insulation layer 3, an insulation shielding layer 4, an inner buffer layer 5, a protective layer 6, a reinforcing steel cable 7, an outer buffer layer 8, and an outer sheath 9, arranged coaxially.

[0023] The conductor 1 is made of highly conductive materials such as copper or aluminum; the conductor shielding layer 2 and the insulating shielding layer 4 are respectively disposed on the outside of the conductor 1 and the insulating layer 3 to uniformly distribute the electric field, suppress partial discharge, and improve the electrical performance of the cable; the insulating layer 3 is made of polymer materials such as cross-linked polyethylene to isolate the high voltage electric field.

[0024] The inner buffer layer 5 is disposed outside the insulating shield layer 4, and the outer buffer layer 8 is disposed outside the reinforcing steel cable 7; the inner buffer layer 5 and the outer buffer layer 8 are made of elastic materials, such as at least one of rubber, thermoplastic elastomer or foamed polymer; these elastic materials can provide good cushioning and shock absorption, absorb external impact energy, and protect the internal structure; preferably, the thickness of the inner buffer layer 5 and the outer buffer layer 8 is 0.5 mm to 3 mm, so as to provide sufficient cushioning while avoiding excessive cable diameter.

[0025] The protective layer 6 is composed of multiple sets of protective units arranged in an array along the cable axis; each set of protective units consists of multiple protective plates 601 surrounding and forming a circular structure; when multiple protective units are arranged along the axis, the protective plates 601 in adjacent protective units are staggered in the circumferential direction, and the axially adjacent protective plates 601 are connected to each other, so that multiple sets of protective units together form a continuous spiral structure; this staggered connection and spiral arrangement greatly enhances the integrity and interlayer bonding of the protective layer 6, and effectively prevents the relative slippage between layers when stretched or bent in the axial direction.

[0026] The radial cross-section of the protective sheet 601 is prismatic, and both its inner and outer walls are arc-shaped. The prismatic cross-section combined with the arc-shaped inner and outer walls allows the protective layer 6 to form a multi-arched continuous support ring when it is circumferentially enclosed. When the cable is subjected to external radial compression, this structure can quickly disperse the local point load or line load along its inclined plane to the adjacent protective sheets 601 on both sides, transforming it into compressive stress over a larger area, thereby effectively avoiding stress concentration, puncture, or severe deformation of the inner insulation.

[0027] The protective plate 601 has steel cable grooves 603 extending along its axial direction on both sides; the cross-section of the steel cable groove 603 is an arc-shaped groove that fits against the outer surface of the reinforcing steel cable 7, and its depth is not less than 1 / 2 of the radius of the reinforcing steel cable 7; this ensures that the reinforcing steel cable 7 can be firmly embedded in the steel cable groove 603 and fit tightly with it, preventing it from falling off or shifting when under stress.

[0028] The protective plate 601 has an axially extending perforated groove 602 inside; the perforated groove 602 is located in the middle region between two steel cable grooves 603 in the cross-section of the protective plate 601, and its cross-sectional area accounts for 20%-50% of the cross-sectional area of ​​the protective plate 601; the perforated groove 602 runs through the protective plate 601 along its axial direction, and its cross-sectional shape can be polygonal, circular, or elliptical; the perforated groove 602 has multiple advantages: firstly, it provides deformation space when the cable is compressed, so that the protective plate 601 can withstand greater compression. The material can undergo micro-deformation within the hollow groove 602, further absorbing energy and preventing rigid fracture caused by the material being completely solid, thereby enhancing the impact resistance of the protective layer 6. Secondly, the hollow groove 602 effectively reduces the amount of material used in the protective sheet 601, thereby reducing the overall weight of the cable and facilitating cable transportation and laying. Furthermore, the through-type design of the hollow groove 602 also ensures that the protective layer 6 has better flexibility when the cable is bent, without hindering the relative fine-tuning between the protective sheets 601, thus improving the bending performance of the cable.

[0029] The protective sheet 601 is preferably made of high-hardness, high-toughness engineering plastics or fiber-reinforced composite materials; the engineering plastics may include nylon, polyoxymethylene or polyetheretherketone, which have excellent mechanical strength, wear resistance and chemical corrosion resistance; the fibers in the fiber-reinforced composite materials may be glass fibers, carbon fibers or aramid fibers, which can significantly improve the strength and stiffness of the composite materials and further enhance the protective ability of the protective layer 6.

[0030] The reinforcing steel cable 7 consists of multiple strands, each laid in a spiral winding manner and correspondingly embedded within the spiral channel formed by the cable grooves 603 on the protective plate 601 with its spiral winding structure. The spiral winding pitch of the reinforcing steel cable 7 is the same as the pitch of the spiral winding structure of the protective layer 6, ensuring that the reinforcing steel cable 7 can be fully accommodated within the spiral channel and fit tightly with it. When the cable is under tension during overhead laying, the spiral reinforcing steel cable 7 and the protective layer 6 with its spiral winding structure interlock, uniformly converting the axial tension into radial interaction force, thereby suppressing radial deformation and axial slippage of the cable's internal structure. Specifically, when the cable is subjected to axial tension, the spirally wound reinforcing steel cable 7 tends to... The cable undergoes a combined deformation of radial contraction and axial tension along its helical angle. Simultaneously, the protective layer 6, also with a helical structure, wraps around and restricts the reinforcing steel cable 7 circumferentially through its cable groove 603. This structure prevents the tensile force from concentrating on a few axial steel cables or a localized area. The tensile force of the reinforcing steel cable 7 is transmitted to the protective plate 601 through the side of the cable groove 603, and then dispersed onto the continuous annular support structure formed by multiple protective plates 601. This process partially transforms the single axial tensile force into radial compressive stress and circumferential stress within the protective layer 6, effectively avoiding the problems of localized stress concentration, structural deformation, and even breakage caused by uneven stress on the reinforcing members in traditional cables.

[0031] The outer sheath 9 is the outermost layer of the cable, used to protect the cable from external environmental corrosion and mechanical damage; the outer sheath 9 is preferably a multi-layer co-extruded composite structure; wherein, the inner layer is a halogen-free flame-retardant polyolefin material, providing good flame retardant performance and environmental protection characteristics; the middle layer is an adhesive waterproof adhesive or polyethylene blend, providing excellent waterproof and moisture-proof performance, preventing moisture from penetrating the inside of the cable; the outer layer is polyvinyl chloride or cross-linked polyethylene with added carbon black or ultraviolet absorbers, providing good weather resistance, UV aging resistance and abrasion resistance.

[0032] The present invention also provides a method for manufacturing a high-safety high-voltage cable, for manufacturing a high-safety high-voltage cable as in Example 1; the method includes the following steps: S1: sequentially braiding or extruding a conductor shielding layer 2, an insulation layer 3, an insulation shielding layer 4 and an inner buffer layer 5 on the outside of a conductor 1 to form a cable core; by using a continuous extrusion or braiding device, each functional layer is precisely wrapped on the outside of the conductor 1 to form a cable core with basic electrical properties.

[0033] S2: Multiple protective plates 601 are positioned using a mold, circumferentially enclosed around the outer periphery of the inner buffer layer 5, and spirally spliced ​​along the axial direction to form a spirally encircling protective layer 6. During the splicing process, the cable grooves 603 are aligned to form a continuous spiral channel. In this step, protective plates 601 with a rhomboid cross-section, arc-shaped inner and outer walls, cable grooves 603, and hollow grooves 602 need to be prefabricated. Then, using a mold or tooling, these protective plates 601 are precisely positioned around the outer periphery of the inner buffer layer 5. Multiple protective plates 601 are connected by circumferential enclosing and axial spiral splicing to form a continuous spiral encircling structure. During the splicing process, it is necessary to ensure that the protective plates 601 in adjacent protective units are staggered in the circumferential direction, and that the axially adjacent protective plates 601 are connected to each other. At the same time, it is necessary to ensure that the cable grooves 603 on each protective plate 601 can be precisely aligned to form a continuous spiral channel.

[0034] S3: During the process of splicing the protective sheet 601 to form the protective layer 6, multiple reinforcing steel cables 7 are simultaneously spirally wound and embedded in the spiral channel with a pitch that matches the spiral channel; before the protective layer 6 is formed, multiple pre-prepared reinforcing steel cables 7 are simultaneously embedded in the steel cable groove 603; since the spiral winding pitch of the reinforcing steel cable 7 is the same as the pitch of the spiral winding structure of the protective layer 6, the reinforcing steel cable 7 can fit tightly with the spiral channel to achieve seamless embedding, ensuring the stability and uniform stress of the reinforcing steel cable 7 in the protective layer 6.

[0035] S4: The outer buffer layer 8 and the outer sheath 9 are sequentially wrapped around the protective layer 6 and the reinforcing steel cable 7. Finally, the outer buffer layer 8 and the outer sheath 9 are sequentially wrapped around the outside of the protective layer 6 and the reinforcing steel cable 7 through extrusion or wrapping processes to complete the overall structure of the cable. The outer buffer layer 8 further provides buffer protection, while the outer sheath 9 provides final mechanical protection and environmental protection.

[0036] The above manufacturing method can efficiently and accurately produce high-voltage cables with high safety performance, ensuring a tight fit between its structural layers and excellent mechanical properties.

[0037] Working Principle: When a cable is subjected to axial tension, such as during overhead or underwater installation, traditional cable reinforcements, such as those reinforced with parallel steel wires or steel strips, are prone to stress concentration, leading to premature failure of some reinforcements or interlayer slippage. In this invention, the spirally wound reinforcing steel cable 7 and the spirally wound protective layer 6 form a special structure. When axial tension is applied to the cable, the reinforcing steel cable 7 tends to undergo a combined deformation of radial contraction and axial tension along its helical angle. At this time, the protective layer 6, through its cable groove 603, forms a circumferential wrapping and restriction around the reinforcing steel cable 7, preventing its radial contraction. Contraction; this interaction partially transforms the single axial tensile force into radial compressive stress and circumferential stress within the protective layer 6, and evenly distributes it to the continuous annular support structure formed by multiple protective plates 601. This stress transformation and dispersion mechanism effectively avoids the concentration of tensile force in a few axial steel cables or a local area, significantly improving the overall tensile strength and structural stability of the cable. The staggered and spiral arrangement of the protective plates 601 also greatly enhances the interlayer bonding force, preventing relative slippage between structural layers under repeated tensile or vibration conditions, and ensuring the long-term stability of the cable structure.

[0038] When the cable is subjected to external radial compression or impact, such as being crushed by heavy objects during construction or being struck by external forces during operation, the protective layer 6, inner buffer layer 5, and outer buffer layer 8 of this invention play a crucial role. The external force first acts on the outer sheath 9 and outer buffer layer 8. The outer buffer layer 8, made of elastic material, can undergo elastic deformation to initially absorb impact energy, providing the first layer of buffer protection. When the remaining pressure is transmitted to the protective layer 6, its prismatic cross-section protective sheet 601 forms a multi-arched continuous support ring after circumferential encirclement. This multi-arched structure has excellent compressive strength and can absorb local point loads or... Line load is rapidly dispersed along its inclined surface to the adjacent protective plates 601 on both sides, transforming into compressive stress over a larger area, effectively preventing stress concentration from puncturing or severely deforming the inner insulation layer; in addition, the hollow groove 602 located in the middle of the protective plate 601 provides controllable deformation space for the material; when subjected to greater compression, the material of the protective plate 601 can undergo micro-deformation into the hollow groove 602, further absorbing energy and preventing rigid fracture caused by the material being completely solid; the through design of the hollow groove 602 also ensures that it will not hinder the relative fine adjustment between the protective plates 601 when the cable is bent, improving the flexibility of the cable.

[0039] In summary, through ingenious structural design, this invention combines the protective layer 6, the reinforcing steel cable 7, the inner buffer layer 5, and the outer buffer layer 8, achieving effective conversion of axial tensile force into radial force and stress dispersion, as well as effective absorption and dispersion of radial compression and impact energy. This significantly improves the tensile, compression, and impact resistance of high-voltage cables, providing a solid guarantee for the safe and reliable operation of high-voltage cables in complex environments.

[0040] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A high-voltage cable with high safety performance, characterized in that, The cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an inner buffer layer, a protective layer, a reinforcing steel cable, an outer buffer layer, and an outer sheath, arranged coaxially. The protective layer consists of multiple sets of protective units arranged in an array along the cable axis. Each set of protective units is formed by multiple protective plates surrounding the cable in a circular ring structure. The radial cross-section of each protective plate is prismatic, with both its inner and outer walls being arc-shaped. The protective plates have steel cable grooves extending along their axial direction on both sides, and hollow grooves extending along their axial direction are provided inside the protective plates. When multiple protective units are arranged axially, the protective plates in adjacent protective units are staggered in the circumferential direction, and the axially adjacent protective plates are connected to each other, so that multiple sets of protective units together form a continuous spiral winding structure. The reinforcing steel cable consists of multiple cables, each laid in a spiral winding manner and correspondingly embedded in the spiral channel formed by the steel cable grooves on the spiral winding structure of the protective plates.

2. The high-voltage cable with high safety performance according to claim 1, characterized in that: The hollowed-out groove is located in the middle region between the two steel cable grooves in the cross-section of the protective sheet, and its cross-sectional area accounts for 20%-50% of the cross-sectional area of ​​the protective sheet.

3. The high-voltage cable with high safety performance according to claim 2, characterized in that: The perforated groove runs through the protective sheet along its axial direction and has a cross-sectional shape of polygon, circle or ellipse. It is used to provide deformation space when the cable is compressed and to reduce the overall weight of the cable.

4. The high-voltage cable with high safety performance according to claim 1, characterized in that: The cross-section of the steel cable groove is an arc-shaped groove that fits against the outer surface of the reinforcing steel cable, and its depth is not less than 1 / 2 of the radius of the reinforcing steel cable.

5. A high-voltage cable with high safety performance according to claim 1, characterized in that: The spiral winding pitch of the reinforcing steel cable is the same as the pitch of the spiral winding structure of the protective layer, so as to ensure that the reinforcing steel cable can be fully accommodated in the spiral channel and fit tightly therewith.

6. A high-voltage cable with high safety performance according to claim 1, characterized in that: The protective sheet is made of high-hardness, high-toughness engineering plastics or fiber-reinforced composite materials. The engineering plastics include nylon, polyoxymethylene, or polyetheretherketone, and the fibers in the fiber-reinforced composite materials are glass fibers, carbon fibers, or aramid fibers.

7. A high-voltage cable with high safety performance according to claim 1, characterized in that: The inner and outer buffer layers are made of elastic materials, including at least one of rubber, thermoplastic elastomers, or foamed polymers, and have a thickness of 0.5 mm to 3 mm.

8. A high-voltage cable with high safety performance according to claim 1, characterized in that: The outer protective layer is a multi-layer co-extruded composite structure; wherein, the inner layer is a halogen-free flame-retardant polyolefin material; the middle layer is an adhesive waterproof adhesive or a polyethylene blend; and the outer layer is polyvinyl chloride or cross-linked polyethylene with added carbon black or ultraviolet absorbers.

9. A high-voltage cable with high safety performance according to claim 1, characterized in that: When the cable is laid overhead and subjected to tension, the spiral reinforcing steel cable and the protective layer of the spiral winding structure mesh with each other, uniformly converting the axial tension into radial interaction force, thereby suppressing the radial deformation and axial slippage of the internal structure of the cable.

10. A method for manufacturing a high-safety-performance high-voltage cable, used to manufacture a high-safety-performance high-voltage cable as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Sequentially braid or extrude a conductor shielding layer, an insulation layer, an insulation shielding layer, and an inner buffer layer to form the cable core; S2: Position multiple protective sheets using a mold, circumferentially enclose the inner buffer layer, and spirally splice them along the axial direction to form the spirally wound protective layer. During the splicing process, align the cable grooves to form a continuous spiral channel; S3: During the splicing of the protective sheets to form the protective layer, simultaneously spirally wind multiple reinforcing steel cables with a pitch matching the spiral channel and embed them into the spiral channel; S4: Sequentially wrap the protective layer and the reinforcing steel cables to form an outer buffer layer and an outer sheath.

Images