Composite polyethylene high-voltage cable

Abstract

The utility model discloses a composite polyethylene high-voltage cable, which relates to the field of high-voltage cables and comprises two cable cores. The two cable cores are intersected and communicated, each cable core is internally provided with a central cable core and at least eight annular cable cores surrounding the central cable core, a composite anti-interference layer is arranged outside the cable core and is composed of a low-frequency shielding layer, an absorbing layer and a high-frequency shielding layer, and the absorbing layer is arranged between the low-frequency shielding layer and the high-frequency shielding layer. The high-voltage cable comprises a composite anti-interference layer, a composite armor layer is arranged outside the composite anti-interference layer, the composite armor layer is composed of a substrate layer, an elastic buffer layer, a reinforcing layer and a protective layer, and an outer sheath is arranged outside the composite armor layer, so that the problem of poor anti-interference performance of the high-voltage cable is solved, and long-acting stable operation of the high-voltage cable is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage cables, and particularly relates to a composite polyethylene high-voltage cable. Background Art

[0002] A high-voltage cable refers to a power cable used for transmitting voltage levels between 1 kV and 1000 kV. The high-voltage cable mainly consists of a conductor, an insulating layer, a shielding layer, a sheath, and a filler. High-voltage cables are widely used in power systems, petrochemical industries, nuclear energy, urban rail transit and other fields.

[0003] For example, the Chinese authorized patent "A High-Voltage Cable Resistant to Fracture" with the publication number CN206524210U includes a cable body. The cable body includes an outer sheath, a steel wire armor layer, and a filling layer. Through holes are equidistantly arranged inside the steel wire armor layer. A cover is arranged inside the through holes. A rubber layer is connected inside the steel wire armor layer. A mica layer is connected inside the rubber layer. Protrusions are equidistantly connected to the outside of the mica layer. One end of the protrusion penetrates through the rubber layer and extends to the inside of the steel wire armor layer. The inside of the mica layer is sleeved with the outside of the filling layer. Inner sheaths are equidistantly arranged inside the filling layer. An insulating layer is arranged outside the inner sheaths. Conductors are equidistantly arranged inside the inner sheaths. The outside of the conductors is connected to the inner wall of the inner sheaths through filling rubber.

[0004] Although the above-mentioned prior art has a certain tensile effect, the overall anti-interference effect is poor and it is easily affected by external electromagnetic interference, resulting in voltage fluctuations on the cable. Such voltage fluctuations may affect the stability of the power system, and at the same time will exacerbate the propagation and amplification of harmonics, causing harmonic pollution to the power system, affecting the power quality and the normal operation of equipment. Therefore, it does not meet the existing requirements, and for this reason, we propose a composite polyethylene high-voltage cable. Content of the Utility Model

[0005] The purpose of the utility model is to provide a composite polyethylene high-voltage cable to solve the problem of poor anti-interference performance of high-voltage cables proposed in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A composite polyethylene high-voltage cable includes two cable cores; the two cable cores intersect and communicate with each other. Each cable core is provided with a central core and an annular core surrounding the central core. There are at least eight annular cores. A composite anti-interference layer is arranged outside the cable core. The composite anti-interference layer is composed of a low-frequency shielding layer, an absorption layer, and a high-frequency shielding layer. A composite armor layer is arranged outside the composite anti-interference layer. The composite armor layer is composed of a base layer, an elastic buffer layer, a strengthening layer, and a protective layer. An outer sheath is arranged outside the composite armor layer.

[0007] Preferably, both the center line core and the annular line core include conductors, which are stranded by multiple copper single wires. The outer part of the conductor is woven in a net shape with reinforcing fibers, and the outer wall of the reinforcing fibers is coated with an inner insulating layer through an extrusion equipment.

[0008] Preferably, a filler is provided between the cable core and the center line core and the annular line core.

[0009] Preferably, the low-frequency shielding layer is wound around the outer wall of the cable core in a net shape. The absorption layer is fixed to the outer wall of the low-frequency shielding layer through an adhesive, and the high-frequency shielding layer is coated on the outer wall of the absorption layer.

[0010] Preferably, the base layer is woven outside the composite anti-interference layer. The elastic buffer layer is located outside the base layer. The strengthening layer is arranged outside the elastic buffer layer. The protective layer is arranged outside the strengthening layer. The base layer, the elastic buffer layer, the strengthening layer and the protective layer are fixed through a polymer adhesive layer.

[0011] Preferably, the outer sheath is composed of a wear-resistant layer and a weather-resistant layer. The wear-resistant layer is wrapped around the outside of the composite armor layer through an extrusion equipment, and the weather-resistant layer is wrapped around the outside of the wear-resistant layer through an extrusion equipment.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. By providing an anti-interference composite layer composed of a low-frequency shielding layer, an absorption layer and a high-frequency shielding layer, the present utility model effectively shields and absorbs electromagnetic waves, reduces the interference of electromagnetic radiation on the surrounding environment and equipment, optimizes the electromagnetic environment, improves the stability and reliability of the equipment, reduces the damage of electromagnetic interference to the internal structure of the cable, reduces the failure rate, extends the service life of the cable, and has high flexibility and adaptability.

[0014] 2. By providing a composite armor layer composed of a base layer, an elastic buffer layer, a strengthening layer and a protective layer, under the combined action of the nano-coated steel strip and the aluminum-magnesium alloy strip armor layer, the corrosion resistance of the cable is greatly improved, and the service life is extended. Both the aluminum-magnesium alloy strip and the nano-coated steel strip have a certain electromagnetic shielding effect, which can effectively reduce low-frequency interference and protect the stability of the internal signal transmission of the cable. The addition of the elastic buffer layer enables the cable to have a certain flexibility while maintaining high strength, and is more easily adapted to complex laying environments.

[0015] 3. The utility model is provided with a strengthened core. The copper single wire is used as the conductor. Copper, as a traditional high-quality conductive material, ensures the efficiency and stability of power transmission with its low resistivity and excellent current transmission ability, minimizing energy loss to the greatest extent and improving energy utilization efficiency. To further enhance the mechanical properties and durability of the core, aramid fiber is introduced as the reinforcement layer, which can significantly enhance the tensile strength and bending resistance of the cable core and ensure the stable operation of the cable in high-temperature environments. The nano-modification technology effectively improves the insulation performance, heat resistance and physical properties of the polyethylene material by introducing nano-particles. Brief Description of the Drawings

[0016] Figure 1 is a perspective view of the utility model;

[0017] Figure 2 is a schematic diagram of the internal structure of the utility model;

[0018] Figure 3 is a schematic diagram of the composite anti-interference layer structure of the utility model;

[0019] Figure 4 is a schematic diagram of the composite armor layer structure of the utility model;

[0020] Figure 5 is a schematic diagram of the outer sheath structure of the utility model.

[0021] In the figure: 1, cable core; 2, core; 21, conductor; 22, reinforcing fiber; 23, inner insulation layer; 3, filler; 4, composite anti-interference layer; 41, low-frequency shielding layer; 42, absorption layer; 43, high-frequency shielding layer; 5, composite armor layer; 51, base layer; 52, elastic buffer layer; 53, strengthening layer; 54, protective layer; 55, polymer adhesive layer; 6, outer sheath; 61, wear-resistant layer; 62, weather-resistant layer. Detailed Description of the Preferred Embodiment

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] Please refer to Figures 1-5, an embodiment provided by the present utility model: a composite polyethylene high-voltage cable, comprising two cable cores 1; the two cable cores 1 intersect and communicate with each other. Each cable core 1 is provided with a central core and an annular core surrounding the central core. There are at least eight annular cores. An external composite anti-interference layer 4 is provided outside the cable core 1. The composite anti-interference layer 4 is composed of a low-frequency shielding layer 41, an absorption layer 42 and a high-frequency shielding layer 43. A composite armor layer 5 is provided outside the composite anti-interference layer 4. The composite armor layer 5 is composed of a base layer 51, an elastic buffer layer 52, a strengthening layer 53 and a protective layer 54. An outer sheath 6 is provided outside the composite armor layer 5.

[0024] This cable core can not only effectively prevent problems such as current leakage and short circuit, improving the safety and reliability of the cable, but also maintain stable insulation performance in high-temperature environments, ensuring the safe operation of the cable under high-temperature conditions. The composite anti-interference layer 4 combines the shielding and absorption mechanisms of high-frequency, medium-frequency and low-frequency, can comprehensively cover electromagnetic interference in different frequency bands, and significantly improves the anti-interference performance of the cable. The composite armor layer 5 significantly improves the tensile, compressive and bending resistance of the cable, enabling it to maintain stable electrical performance in harsh environments.

[0025] Please refer to Figure 2 , both the central core and the annular core include a conductor 21. The conductor 21 is stranded by multiple copper single wires. The outside of the conductor 21 is woven in a net shape with reinforcing fibers 22. The outer wall of the reinforcing fibers 22 is coated with an inner insulation layer 23 through an extrusion device. The conductor 21 uses copper single wires as the core layer for current transmission, reducing energy loss during transmission; the reinforcing fibers 22 are aramid fibers, improving the overall mechanical strength and tensile resistance of the core, while maintaining the flexibility of the core; the inner insulation layer 23 uses nano-modified polyethylene, improving insulation performance while reducing volume and weight, and at the same time improving heat resistance and mechanical strength.

[0026] Please refer to Figure 1 and Figure 2 , a filler 3 is provided between the cable core 1 and the central core and the annular core.

[0027] Please refer to Figure 3, the low-frequency shielding layer 41 is wound around the outer wall of the cable core 1 in a mesh shape. The absorption layer 42 is fixed to the outer wall of the low-frequency shielding layer 41 through an adhesive. The high-frequency shielding layer 43 is coated on the outer wall of the absorption layer 42. The low-frequency shielding layer 41 is woven into a mesh structure with high-density copper wires to form a low-impedance shielding path, effectively blocking the penetration of low-frequency electromagnetic waves; the absorption layer 42 is a ferrite, which is a magnetic metal oxide and has an absorption effect on electromagnetic waves. By adjusting its composition and structure, effective absorption of electromagnetic waves in a specific frequency band can be achieved. This layer can absorb and convert the energy of electromagnetic waves, reducing reflection and transmission; the high-frequency shielding layer 43 is a nano-silver wire coating. For high-frequency electromagnetic interference, a nano-material coating is used to form a dense shielding layer, effectively blocking the penetration of high-frequency electromagnetic waves.

[0028] Please refer to Figure 4 , the base layer 51 is woven outside the composite anti-interference layer 4. The elastic buffer layer 52 is located outside the base layer 51. The strengthening layer 53 is arranged outside the elastic buffer layer 52. The protective layer 54 is arranged outside the strengthening layer 53. The base layer 51, the elastic buffer layer 52, the strengthening layer 53 and the protective layer 54 are fixed through a polymer adhesive layer 55. The base layer 51 is made of a high-strength stainless steel wire woven mesh, providing basic mechanical strength and tensile resistance. The stainless steel wire has good corrosion resistance and high strength, suitable as the inner layer foundation; the elastic buffer layer 52 is made of polyurethane foam, absorbing external impacts and vibrations to protect the internal structure from damage; the strengthening layer 53 is made of an aluminum-magnesium alloy strip, not only enhancing the overall mechanical protection, but also reducing the overall weight through the light weight characteristics of the aluminum-magnesium alloy, and at the same time having a certain electromagnetic shielding effect; the protective layer 54 is made of a cold-rolled steel strip with a nano-polymer coating on the surface, further improving corrosion resistance and wear resistance. The nano-coating can also enhance the surface hardness of the steel strip and improve the scratch resistance; a thin and tough polymer adhesive layer 55 is provided between each layer to ensure close bonding between the layers, prevent interlayer sliding or separation, and improve the stability and durability of the overall structure.

[0029] Please refer to Figure 5 , the outer sheath 6 is composed of a wear-resistant layer 61 and a weather-resistant layer 62. The wear-resistant layer 61 is wrapped around the outside of the composite armor layer 5 through an extrusion equipment. The weather-resistant layer 62 is wrapped around the outside of the wear-resistant layer 61 through an extrusion equipment. The wear-resistant layer 61 is made of polyvinyl chloride, having stable physical and chemical properties, good mechanical strength and electrical insulation, and excellent flame retardant performance; the weather-resistant layer 62 is made of polyethylene, having excellent low-temperature resistance and chemical stability, and can withstand the erosion of most acids and alkalis.

[0030] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A composite polyethylene high voltage cable, comprising two cable cores (1); characterized in that: The two cable cores (1) intersect and are connected, each of the cable cores (1) is provided with a central core and an annular core surrounding the central core, at least eight annular cores are provided, a composite anti-interference layer (4) is provided on the outside of the cable core (1), the composite anti-interference layer (4) is composed of a low-frequency shielding layer (41), an absorption layer (42) and a high-frequency shielding layer (43), a composite armor layer (5) is provided on the outside of the composite anti-interference layer (4), the composite armor layer (5) is composed of a base layer (51), an elastic buffer layer (52), a reinforcement layer (53) and a protective layer (54), and an outer sheath (6) is provided on the outside of the composite armor layer (5).

2. A composite polyethylene high voltage cable according to claim 1, characterized in that: The central core and the annular core both comprise a conductor (21), the conductor (21) being formed by twisting a plurality of copper monofilaments, the exterior of the conductor (21) being woven with reinforcing fibers (22) in a mesh shape, the outer wall of the reinforcing fibers (22) being coated with an inner insulating layer (23) by an extrusion device.

3. A composite polyethylene high voltage cable according to claim 1, characterized in that: A filler (3) is provided between the cable core (1), the central core and the annular core.

4. A composite polyethylene high voltage cable according to claim 1, characterized in that: The low-frequency shielding layer (41) is wound in a mesh shape on the outer wall of the cable core (1), the absorption layer (42) is fixed to the outer wall of the low-frequency shielding layer (41) by means of an adhesive, and the high-frequency shielding layer (43) is coated on the outer wall of the absorption layer (42).

5. A composite polyethylene high voltage cable according to claim 1, characterized in that: The base layer (51) is woven on the outside of the composite anti-interference layer (4), the elastic buffer layer (52) is located on the outside of the base layer (51), the reinforcement layer (53) is arranged on the outside of the elastic buffer layer (52), and the protective layer (54) is arranged on the outside of the reinforcement layer (53); the base layer (51), the elastic buffer layer (52), the reinforcement layer (53) and the protective layer (54) are fixed by a polymer adhesive layer (55).

6. A composite polyethylene high voltage cable according to claim 1, characterized in that: The outer sheath (6) is composed of a wear-resistant layer (61) and a weather-resistant layer (62); the wear-resistant layer (61) is wrapped around the outside of the composite armor layer (5) by an extrusion device, and the weather-resistant layer (62) is wrapped around the outside of the wear-resistant layer (61) by an extrusion device.

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