High-voltage cable and high-voltage cable system

Abstract

The utility model relates to a kind of high-voltage cable and high-voltage cable system, and the high-voltage cable includes center layer and conductor layer. Among them, the center layer is formed by twisting multiple insulated filaments;Conductor layer, coated center layer, conductor layer includes multiple composite conductor layers sequentially arranged along the first direction, composite conductor layer is formed by twisting multiple insulated filaments, or multiple bare conductors are twisted to form, or insulated filaments and bare conductors are twisted to form according to preset proportion. The above-mentioned high-voltage cable, the center layer uses insulated filament, the conductor layer uses insulated filament or bare conductor or the combination structure of both, suppresses skin effect, ensures uniform distribution of current, improves cable conductor carrying capacity;At the same time, it greatly reduces the amount of enameled conductor, has small size, low loss, high reliability.

Description

Technical Field

[0001] This utility model relates to the field of power transmission and communication integration technology, and in particular to high-voltage cables and high-voltage cable systems. Background Technology

[0002] Currently, the traditional stranded structure of high-voltage cables suffers from problems such as decreased central conductivity, increased cost, severe harmonic pollution, and large space occupation under power frequency, making it difficult to simultaneously meet the comprehensive requirements of modern power grids for transmission efficiency, economy, and reliability. Utility Model Content

[0003] Therefore, it is necessary to provide a high-voltage cable and high-voltage cable system that can suppress the skin effect and is low-cost, in order to address the above problems.

[0004] In a first aspect, this utility model provides a high-voltage cable, comprising:

[0005] The central layer is formed by twisting together multiple insulating monofilaments;

[0006] The conductor layer covers the core layer; the conductor layer includes multiple composite conductor layers arranged sequentially along a first direction; the composite conductor layer is formed by twisting multiple insulating monofilaments together, or by twisting multiple bare conductors together, or by twisting insulating monofilaments and bare conductors together in a preset ratio.

[0007] In one embodiment, both the insulating monofilament and the bare conductor are trapezoidal monofilaments with a trapezoidal cross-section. The smaller diameter side of the trapezoidal monofilament faces the central layer, while the larger diameter side faces away from the central layer.

[0008] In one embodiment, the outer surface of the central layer is covered with an insulating layer.

[0009] In one embodiment, the thickness of the insulating layer is 0.05mm-0.1mm.

[0010] In one embodiment, the stranding directions of adjacent composite conductor layers are opposite.

[0011] In one embodiment, the plurality of composite conductor layers include a first composite conductor layer, a second composite conductor layer, a third composite conductor layer and a fourth composite conductor layer disposed sequentially along a first direction;

[0012] The first composite conductor layer, the second composite conductor layer, and the third composite conductor layer are formed by twisting insulating monofilaments and bare conductors in a predetermined ratio; wherein, the first composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:1 ratio, the second composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:2 ratio, and the third composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 3:1 ratio.

[0013] The fourth composite conductor layer is made of bare conductors twisted together.

[0014] In one embodiment, the wire diameter ratio of the insulating monofilament to the bare conductor in the first composite conductor layer, the second composite conductor layer and the third composite conductor layer ranges from 1:0.9 to 1:1.1.

[0015] In one embodiment, the plurality of composite conductor layers include a first composite conductor layer, a second composite conductor layer, a third composite conductor layer and a fourth composite conductor layer disposed sequentially along a first direction;

[0016] The first composite conductor layer, the second composite conductor layer, and the third composite conductor layer are formed by twisting insulating monofilaments and bare conductors in a predetermined ratio; wherein, the first composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:1 ratio, the second composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 2:1 ratio, and the third composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:3 ratio.

[0017] The fourth composite conductor layer is made of bare conductors twisted together.

[0018] In one embodiment, the wire diameter ratio of the insulating monofilament to the bare conductor in the first composite conductor layer, the second composite conductor layer and the third composite conductor layer ranges from 1:0.9 to 1:1.1.

[0019] Secondly, this utility model provides a high-voltage cable system, which includes the high-voltage cable described in any of the above embodiments.

[0020] The aforementioned high-voltage cable uses insulated monofilaments in the core layer and insulated monofilaments, bare conductors, or a combination of both in the conductor layer. The insulated monofilaments in the core layer isolate the current path and suppress the skin effect. The composite conductor layer formed by twisting insulated monofilaments, bare conductors, or both ensures uniform current distribution, significantly reducing AC / DC resistance at 50Hz power frequency compared to traditional conductors and increasing the current carrying capacity of the cable conductor. At the same time, by using a composite conductor layer made of insulated monofilaments and bare conductors in a predetermined ratio, the amount of enameled conductor used is greatly reduced. It is suitable for 110kV and above high-voltage transmission systems and has the advantages of small size, low loss, high reliability, and industrial production. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a high-voltage cable according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a high-voltage cable according to another embodiment of the present invention.

[0023] Figure label:

[0024] 10. Core layer; 20. Conductor layer; 210. First composite conductor layer; 220. Second composite conductor layer; 230. Third composite conductor layer; 240. Fourth composite conductor layer; 310. Small diameter side; 320. Large diameter side. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] Currently, the design of high-voltage cable conductor structures faces multiple technical challenges: When stranded conductors transmit alternating current, the uneven distribution of current density across the conductor cross-section, known as the skin effect, causes current to preferentially concentrate near the outer surface of the conductor, while almost no current flows through the central region. This leads to increased AC resistance of traditional stranded conductors at power frequencies, and the skin depth decreases with increasing voltage levels, resulting in reduced conductivity at the conductor's center. While fully enameled conductors can suppress the skin effect, the excessive insulation layer increases costs. Harmonic pollution from renewable energy sources raises the equivalent frequency to 150-650Hz, causing increased AC resistance at 100Hz in traditional structures, which increases exponentially with frequency. These problems manifest as a trade-off between high loss, high cost, high manufacturing complexity, and low reliability.

[0032] Traditional technologies mainly rely on a single protection method, and the material ratio and structural design have not formed a synergistic optimization mechanism, making it difficult to simultaneously meet the comprehensive requirements of modern power grids for transmission efficiency, economy and reliability. There is an urgent need for a conductor structure that can improve the skin effect suppression rate, reduce the amount of enameled conductor, reduce AC resistance and adapt to industrial production while ensuring insulation performance.

[0033] In one exemplary embodiment, such as Figure 1 As shown, this utility model provides a high-voltage cable conductor, including: a central layer 10 and a conductor layer 20.

[0034] The central layer 10 is formed by twisting together multiple insulating monofilaments.

[0035] Optionally, the core layer 10 is formed by twisting together multiple insulating monofilaments, constituting the inner support skeleton of the conductor. This twisted structure can be arranged concentrically, with a twist pitch ranging from several times the diameter of the monofilament, and can be adjusted according to actual needs to ensure structural compactness and mechanical stability.

[0036] For example, the insulating monofilament can be an enameled copper conductor or a copper oxide film conductor, combining insulation and tensile strength. The enameled copper conductor can use a polyesterimide or polyamide-imide enamel coating, exhibiting excellent temperature resistance and flexibility. The copper oxide film conductor uses an anodizing process to generate a copper oxide insulating layer on the copper surface. The substrate can be a silver-containing copper alloy (e.g., Ag content 0.1-0.3%), maintaining high conductivity while improving tensile strength and ensuring shape stability under long-term stress or high-temperature conditions, making it particularly suitable for applications requiring creep resistance.

[0037] The conductor layer 20 covers the central layer 10; the conductor layer 20 includes a plurality of composite conductor layers arranged sequentially along a first direction; the composite conductor layer is formed by twisting together multiple insulating monofilaments, or by twisting together multiple bare conductors, or by twisting together insulating monofilaments and bare conductors in a preset ratio.

[0038] Optionally, the first direction can be a radial direction from the inside to the outside along the conductor layer 20. Figure 1 The X direction is used to indicate this. Conductor layer 20 is composed of multiple composite conductor layers twisted radially from the inside out, with multiple composite conductor layers coaxially covering the surface. Each composite conductor layer achieves gradient conductivity and skin effect suppression by adjusting the ratio of insulating monofilaments to bare conductors. The combination of insulating monofilaments and bare conductors reduces the skin effect at high frequencies, and the mixing ratio can be adapted to different voltage levels.

[0039] For example, each composite conductor layer is constructed in any of the following ways:

[0040] Purely insulated monofilaments: The insulated monofilaments are made of enameled copper conductors or copper oxide film copper conductors. The current between the monofilaments is isolated by the insulation layer, which forces the current to be distributed evenly.

[0041] Bare conductors: such as oxygen-free copper conductors, are low in cost but require an outer layer of insulating monofilament to suppress the skin effect.

[0042] Mixed stranding: Insulating monofilaments and bare conductors are mixed in a preset ratio (1:1 to 1:3) and stranded into 3-5 layers of stranded conductors, with adjacent layers stranded in opposite directions, taking into account both performance and economy.

[0043] This structure effectively suppresses the skin effect by isolating the current path with insulating monofilaments, significantly reducing the AC and DC resistance at 50Hz power frequency compared to traditional conductors and increasing the current carrying capacity of the cable conductor. Simultaneously, it reduces the amount of enameled conductor used, lowering material costs. Combined with CNC stranding technology, high-precision control of the conductor layer outer diameter can be achieved at ±0.1mm.

[0044] The aforementioned high-voltage cable uses an insulated monofilament in the core layer and an insulated monofilament, a bare conductor, or a combination of both in the conductor layer. The insulated monofilament isolates the current path and suppresses the skin effect. The composite conductor layer formed by the insulated monofilament and the bare conductor ensures uniform current distribution, significantly reducing AC / DC resistance at 50Hz power frequency compared to traditional conductors and increasing the current carrying capacity of the cable conductor. At the same time, it greatly reduces the amount of enameled conductor used, making it suitable for 110kV and above high-voltage transmission systems. It also has the advantages of small size, low loss, high reliability, and industrial production.

[0045] In one exemplary embodiment, such as Figure 2 As shown, both the insulated monofilament and the bare conductor are trapezoidal monofilaments. The cross-section of the trapezoidal monofilament is trapezoidal. The smaller diameter side 310 of the trapezoidal monofilament faces the center layer, while the larger diameter side 320 faces away from the center layer.

[0046] For example, the smaller diameter side 310 refers to the side with the shorter length of the two parallel sides of the trapezoidal single line, and the larger diameter side 320 refers to the side with the longer length of the two parallel sides of the trapezoidal single line. In the conductor layer structure, the smaller diameter side 310 of the trapezoidal single line faces inward, and the larger diameter side 320 faces outward, which greatly improves the fill factor. The smaller diameter side 310 forms a high-stress contact surface with the central layer, and the larger diameter side 320 forms a radial support arch bridge, optimizing the transfer of forces and suppressing conductor deformation under bending conditions. In addition, the larger diameter side forms a continuous conductive surface, effectively reducing high-frequency resistance.

[0047] The trapezoidal single-wire stranded structure brings about multiple performance improvements to high-voltage cable conductors. Compared with traditional round conductors, the stranding of single wires with trapezoidal cross-sections has significant advantages in terms of space utilization, mechanical properties, and electrical characteristics.

[0048] In terms of space utilization, the trapezoidal single-wire interlocking design makes the conductor structure more compact, greatly reducing interlayer gaps. This allows for more conductive material to be accommodated within the same cable outer diameter, effectively increasing the conductor cross-sectional area and thus enhancing current carrying capacity. Conversely, to maintain the same current carrying capacity, the trapezoidal single-wire structure can reduce the overall cable size, providing greater flexibility for installation spaces with limited space.

[0049] The improvement in mechanical properties is equally significant. The interlocking characteristics of the trapezoidal structure enhance the overall integrity of the conductor, giving it better resistance to compression and deformation. During cable laying and operation, this structure better resists external forces, reducing damage caused by bending and compression, thereby extending the cable's service life. Under dynamic conditions, such as vibration or short circuits, the trapezoidal conductor exhibits a more stable structural retention capability.

[0050] In terms of electrical performance, the surface shape of the trapezoidal conductor is more conducive to the uniform distribution of current, effectively reducing the additional losses caused by the skin effect and proximity effect. At the same time, the tight stranded structure improves the interface characteristics between the conductor and the insulation layer, making the electric field distribution more uniform and helping to improve the reliability of the insulation system.

[0051] From an engineering application perspective, this not only improves the performance of the cable itself, but also reduces copper usage while meeting performance requirements due to increased material utilization. The reduced channel space required for installation lowers construction difficulty and costs. Excellent mechanical stability significantly reduces operation and maintenance needs, greatly reducing industrial costs.

[0052] The aforementioned high-voltage cables are constructed using trapezoidal single-wire stranding. Each composite conductor layer consists of single wires with a trapezoidal cross-section stranded together. This trapezoidal stranding structure improves the fill factor and reduces interlayer gaps, enhancing interlayer bonding strength. Compared to traditional compressed round and split conductors, trapezoidal conductors better adapt to the internal space of the cable. With the same cable outer diameter, the conductor cross-sectional area can be increased, improving the cable's current-carrying capacity. Alternatively, with the same current-carrying capacity requirements, the cable outer diameter can be reduced, saving installation space, which is of great significance in space-constrained locations. Furthermore, the trapezoidal conductor structure is stable, possessing better mechanical strength and deformation resistance, reducing the risk of damage during cable laying and operation, lowering maintenance and replacement costs, and improving cable lifespan and safety.

[0053] In one exemplary embodiment, the outermost composite conductor layer disposed along a first direction is formed by stranding multiple bare conductors.

[0054] For example, the outermost composite conductor layer, arranged along the first direction (i.e., the radial direction of the cable from the inside to the outside), is formed by stranding bare conductors. During high-voltage cable operation, the current density at the conductor surface is highest (skin effect). Using a high-conductivity bare conductor (such as oxygen-free copper or aluminum alloy) for the outermost layer significantly reduces surface resistance and AC losses. The insulating monofilaments in the inner composite conductor suppress eddy currents, while the outer bare conductor directly undertakes the main current-carrying function, achieving a balance between conductivity and insulation performance.

[0055] In one exemplary embodiment, the outer surface of the central layer 10 is covered with an insulating layer.

[0056] For example, the insulating layer is directly wrapped around the outer surface of the central layer 10, which is composed of stranded insulating monofilaments. The insulating layer is made of a high-temperature resistant polymer material, which has excellent dielectric strength and corona resistance. The insulating layer can effectively isolate the potential difference between the central layer and the conductor layer, prevent partial discharge from occurring in the stranding gap, provide a smooth transition surface, and facilitate the tight wrapping of the conductor layer 20.

[0057] For example, an extrusion coating or wrapping process can be used to form a continuous and uniform insulating layer, controlling the surface roughness to ensure good contact with the conductor layer. The insulating layer material can be a polyimide film or a cross-linked polyethylene coating, which ensures insulation performance while avoiding increasing the outer diameter of the conductor.

[0058] In one exemplary embodiment, the thickness of the insulating layer is 0.05mm-0.1mm.

[0059] For example, the insulating layer is made of polyimide, polytetrafluoroethylene (PTFE), or copper oxide, with a thickness of 0.05-0.1 mm. Polyimide films are particularly suitable for high-temperature, high-frequency applications; PTFE has excellent chemical resistance, making it suitable for applications requiring corrosion resistance and low friction; copper oxide ceramic coatings combine insulation and heat dissipation functions, making them suitable for high-power-density applications. The 0.05-0.1 mm thickness range satisfies basic insulation requirements, maximizes conductor cross-sectional area, and provides a reliable insulation safety margin.

[0060] In one exemplary embodiment, the stranding directions of adjacent composite conductor layers are opposite.

[0061] For example, the stranding direction guides the rotation direction of the single-wire spiral winding in the body layer. The mutual constraint of the forward and reverse stranding directions of adjacent composite conductor layers forms a self-balancing mechanical structure, eliminating the residual torque generated by unidirectional stranding, balancing the internal stress of the cable, and preventing conductor loosening and deformation; reducing AC resistance, improving the uniformity of current distribution in multilayer conductors, and enhancing high-frequency current transmission capability. When adjacent composite conductor layers are arranged with opposite stranding directions, the fill factor can be increased to over 90% by controlling parameters such as the stranding pitch ratio and stranding angle of adjacent layers.

[0062] In the above embodiments, the central layer insulation treatment ensures the reliability of interlayer insulation, the precisely controlled insulation layer thickness optimizes space utilization, and the reverse stranding design enhances mechanical strength and electrical performance. Through the synergistic optimization of mechanics and electromagnetism, the conductor maintains excellent conductivity while also possessing outstanding mechanical strength and structural stability, laying the foundation for the long-term reliable operation of high-voltage cables.

[0063] The following embodiments illustrate the cable conductor layer structure of this utility model.

[0064] In one exemplary embodiment, such as Figure 1As shown, the multiple composite conductor layers include a first composite conductor layer 210, a second composite conductor layer 220, a third composite conductor layer 230 and a fourth composite conductor layer 240 arranged sequentially along a first direction;

[0065] The first composite conductor layer 210, the second composite conductor layer 220, and the third composite conductor layer 230 are formed by twisting insulating monofilaments and bare conductors in a predetermined ratio; wherein, the first composite conductor layer 210 is formed by twisting insulating monofilaments and bare conductors in a 1:1 ratio, the second composite conductor layer 220 is formed by twisting insulating monofilaments and bare conductors in a 1:2 ratio, the third composite conductor layer 230 is formed by twisting insulating monofilaments and bare conductors in a 3:1 ratio, and the fourth composite conductor layer 240 is formed by twisting bare conductors.

[0066] For example, the first composite conductor layer 210 uses an alternating 1:1 ratio of insulating monofilaments to bare conductors to form a stable current transition region, effectively suppressing eddy current losses within the conductor. The 1:1 ratio ensures that the layer possesses both good conductivity and moderate insulation strength. As a buffer layer, it alleviates mechanical stress between the central layer and the outer conductor layer. In the second composite conductor layer 220, the proportion of bare conductors is increased to 2 / 3, significantly improving the current-carrying capacity of the layer and undertaking the main conductive function. The retained insulating monofilaments prevent micro-discharges caused by direct contact between conductors. In the third composite conductor layer 230, insulating monofilaments dominate, forming a high-strength insulation barrier. The trapezoidal structure of the insulating monofilaments provides excellent radial support, effectively blocking external electromagnetic interference. The fourth composite conductor layer 240 is formed by tightly stranding pure bare conductors, maximizing surface conductivity. Its outer surface roughness can be optimized to facilitate additional shielding layer coverage.

[0067] In the above embodiments, the design of layering and twisting insulated monofilaments and bare conductors in a 1:1-1:3 ratio with adjacent layers twisted in opposite directions improves the skin effect suppression rate. At a 50Hz power frequency, the AC / DC resistance ratio is reduced by 10% compared to traditional conductors, and the AC / DC resistance ratio can reach as low as 1.2. At the same time, compared to using all insulated monofilaments, the amount of enameled conductor used is reduced by 50-60%, thus reducing material costs. The structural layout of using insulated monofilaments for the core layer and bare conductors for the outermost layer ensures uniform current distribution, thereby increasing the current carrying capacity by 15-20%.

[0068] In an exemplary embodiment, the wire diameter ratio of the insulating monofilament to the bare conductor in the first composite conductor layer 210, the second composite conductor layer 220, and the third composite conductor layer 230 ranges from 1:0.9 to 1:1.1.

[0069] For example, the wire diameter of the insulated monofilament and the bare conductor refers to the distance between the small-diameter side and the large-diameter side of the trapezoidal monofilament. The wire diameter ratio of the insulated monofilament to the bare conductor in the first composite conductor layer 210, the second composite conductor layer 220, and the third composite conductor layer 230 is controlled between 1:0.9 and 1:1.1, maintaining a cross-sectional fill factor of over 90%. The absolute dimensions of the insulated monofilament and the bare conductor can be adjusted according to the total cross-sectional area requirement of the conductor, while maintaining the wire diameter ratio. This ensures both the effective utilization rate of the conductor cross-section and optimizes the uniformity of current distribution, providing a carrier for high-density current transmission.

[0070] In one exemplary embodiment, such as Figure 2 As shown, the multiple composite conductor layers include a first composite conductor layer 210, a second composite conductor layer 220, a third composite conductor layer 230 and a fourth composite conductor layer 240 arranged sequentially along a first direction;

[0071] The first composite conductor layer 210, the second composite conductor layer 220, and the third composite conductor layer 230 are formed by twisting insulating monofilaments and bare conductors in a predetermined ratio; wherein, the first composite conductor layer 210 is formed by twisting insulating monofilaments and bare conductors in a 1:1 ratio, the second composite conductor layer 220 is formed by twisting insulating monofilaments and bare conductors in a 2:1 ratio, the third composite conductor layer 230 is formed by twisting insulating monofilaments and bare conductors in a 1:3 ratio, and the fourth composite conductor layer 240 is formed by twisting bare conductors.

[0072] For example, the first composite conductor layer 210 is formed by twisting insulated monofilaments and bare conductors in a 1:1 ratio. The high proportion of insulated monofilaments effectively suppresses the skin effect and provides electromagnetic isolation protection for the internal optical cable assembly. The second composite conductor layer 220 is formed by twisting insulated monofilaments and bare conductors in a 2:1 ratio, using a "double insulated monofilament + single bare conductor" unit twisting pattern. The third composite conductor layer 230 is formed by twisting insulated monofilaments and bare conductors in a 1:3 ratio, maintaining sufficient conductivity through outer insulation protection and enhancing the mechanical strength of the conductor. The fourth composite conductor layer 240 is formed by twisting bare conductors, providing the maximum conductive cross-sectional area, serving as a mechanical protective layer to resist external stress and optimize heat dissipation performance.

[0073] In the above embodiments, the four-layer composite structure of the high-voltage cable conductor, through innovative material ratio design and precise layered reverse stranding scheme, significantly improves current distribution characteristics through a gradient structure, effectively controls the skin effect coefficient, and can increase the conductor cross-sectional area and improve the cable's current carrying capacity under the same cable outer diameter, or reduce the cable's outer diameter and save installation space under the same current carrying capacity requirements. The four-layer structure achieves a gradient transition of mechanical properties through differentiated material ratios, and the preset ratio design provides excellent bending resistance and radial compressive strength.

[0074] In one exemplary embodiment, the present invention also provides a high-voltage cable system, which includes the high-voltage cable of any of the above embodiments.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high-voltage cable, characterized in that, include: The central layer is formed by twisting together multiple insulating monofilaments; A conductor layer covers the central layer; the conductor layer includes a plurality of composite conductor layers arranged sequentially along a first direction; the composite conductor layer is formed by twisting together multiple insulating monofilaments, or by twisting together multiple bare conductors, or by twisting together insulating monofilaments and bare conductors in a preset ratio.

2. The high-voltage cable according to claim 1, characterized in that, Both the insulating monofilament and the bare conductor are trapezoidal monofilaments with a trapezoidal cross-section. The smaller diameter side of the trapezoidal monofilament faces the central layer, while the larger diameter side faces away from the central layer.

3. The high-voltage cable according to claim 1, characterized in that, The outer surface of the central layer is covered with an insulating layer.

4. The high-voltage cable according to claim 3, characterized in that, The thickness of the insulating layer is 0.05mm-0.1mm.

5. The high-voltage cable according to claim 1, characterized in that, The stranding directions of adjacent composite conductor layers are opposite.

6. The high-voltage cable according to claim 5, characterized in that, The plurality of composite conductor layers include a first composite conductor layer, a second composite conductor layer, a third composite conductor layer and a fourth composite conductor layer arranged sequentially along a first direction; The first composite conductor layer, the second composite conductor layer, and the third composite conductor layer are formed by twisting insulating monofilaments and bare conductors in a predetermined ratio; wherein, the first composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:1 ratio, the second composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:2 ratio, and the third composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 3:1 ratio. The fourth composite conductor layer is formed by stranding bare conductors.

7. The high-voltage cable according to claim 6, characterized in that, The wire diameter ratio of the insulating monofilament to the bare conductor in the first composite conductor layer, the second composite conductor layer and the third composite conductor layer ranges from 1:0.9 to 1:1.

1.

8. The high-voltage cable according to claim 5, characterized in that, The plurality of composite conductor layers include a first composite conductor layer, a second composite conductor layer, a third composite conductor layer and a fourth composite conductor layer arranged sequentially along a first direction; The first composite conductor layer, the second composite conductor layer, and the third composite conductor layer are formed by twisting insulating monofilaments and bare conductors in a predetermined ratio; wherein, the first composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:1 ratio, the second composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 2:1 ratio, and the third composite conductor layer is formed by twisting insulating monofilaments and bare conductors in a 1:3 ratio. The fourth composite conductor layer is formed by stranding bare conductors.

9. The high-voltage cable according to claim 8, characterized in that, The wire diameter ratio of the insulating monofilament to the bare conductor in the first composite conductor layer, the second composite conductor layer and the third composite conductor layer ranges from 1:0.9 to 1:1.

1.

10. A high-voltage cable system, characterized in that, The high-voltage cable system includes the high-voltage cable as described in any one of claims 1-9.

Images