Double-sheath power cable suitable for alpine region

Abstract

The utility model discloses a double-sheath power cable suitable for alpine regions, which comprises a plurality of conductors, insulation shielding layers sleeve the peripheries of the plurality of conductors, metal shielding layers sleeve the peripheries of the insulation shielding layers, a protection layer is arranged on the peripheries of the plurality of metal shielding layers, and fillers are arranged between the protection layer and the plurality of metal shielding layers. The protection layer comprises an outer sheath, an inner sheath and an interwoven skeleton, and the interwoven skeleton is embedded between the outer sheath and the inner sheath and is made of nylon fabric. According to the utility model, through the arrangement of the interwoven skeleton, the interwoven skeleton made of nylon fabric can replace a traditional armored skeleton, so that the protective layer of the cable can reduce backflow generated under the conditions of insulation layer damage and armored multipoint grounding, the low temperature prevention level of the cable is improved, the fault rate is reduced, and the cable accords with the actual situation of an alpine region.

Description

Technical Field

[0001] This utility model relates to the field of power engineering technology, specifically to a double-sheathed power cable suitable for high-altitude and cold regions. Background Technology

[0002] In order to study the selection, laying and testing of power cables in high-altitude and cold regions, and to address the impact of low temperature and high temperature differences on cable operation, this study investigated the use of double-sheathed cables and stray current interference. In order to improve the low temperature resistance of cables and reduce the failure rate, a special design was made based on the actual site conditions. It is urgent to design a double-sheathed power cable suitable for high-altitude and cold regions to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide a double-sheathed power cable suitable for high-altitude and cold regions, in order to overcome the aforementioned shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A double-sheathed power cable suitable for high-altitude and cold regions includes multiple conductors, each conductor having an insulating shielding layer around its periphery, a metal shielding layer around its periphery, a protective layer around its periphery, and a filler material between the protective layer and the multiple metal shielding layers; the protective layer includes an outer sheath, an inner sheath, and an interlaced skeleton, the interlaced skeleton being embedded between the outer sheath and the inner sheath, and the interlaced skeleton being made of nylon fabric.

[0006] Furthermore, both the outer sheath and the inner sheath are made of polyvinyl chloride.

[0007] Furthermore, the material of the interwoven skeleton is nylon 6 fiber.

[0008] Furthermore, the overall thickness of the outer sheath and the inner sheath is 4mm, and the material proportion of the interwoven skeleton is more than 38%.

[0009] Furthermore, the insulating shielding layer is made of polyethylene.

[0010] In the above technical solution, the present invention provides a double-sheathed power cable suitable for high-altitude and cold regions, which has the following advantages:

[0011] By using an interlaced skeleton, the nylon fabric interlaced skeleton can replace the traditional armored skeleton, which reduces insulation damage and backflow caused by multiple grounding points in the armored system. This improves the cable's low-temperature resistance, reduces the failure rate, and is suitable for the actual conditions in cold regions. High-speed railway power cables are mainly laid in prefabricated cable trenches, and direct-buried sections are also protected by cement cable troughs. Most of them are within railway protection zones and are rarely threatened by large machinery. The nylon fabric interlaced skeleton is lighter, more wear-resistant, and more tensile-resistant than steel wire rope. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0013] Figure 1 This is a schematic diagram of the structure of a double-sheathed power cable provided in an embodiment of the present invention, which is suitable for use in cold regions.

[0014] Figure 2 This is a schematic diagram of the protective layer structure provided in an embodiment of a double-sheathed power cable suitable for high-altitude and cold regions according to this utility model.

[0015] 1. Conductor; 2. Insulating shielding layer; 3. Metallic shielding layer; 4. Protective layer; 5. Filler; 6. Outer sheath; 7. Inner sheath; 8. Interwoven skeleton. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0017] like Figure 1-2 As shown in the figure, this utility model provides a double-sheathed power cable suitable for high-altitude and cold regions.

[0018] It includes multiple conductors 1, each conductor 1 is surrounded by an insulating shielding layer 2, each insulating shielding layer 2 is surrounded by a metal shielding layer 3, and each metal shielding layer 3 is surrounded by a protective layer 4. A filler 5 is provided between the protective layer 4 and the multiple metal shielding layers 3. The protective layer 4 includes an outer sheath 6, an inner sheath 7 and an interwoven skeleton 8, which is embedded between the outer sheath 6 and the inner sheath 7. The interwoven skeleton 8 is made of nylon fabric.

[0019] In this embodiment, the outer sheath 6 and inner sheath 7 are made of polyvinyl chloride (PVC). PVC exhibits good temperature resistance, allowing application within a temperature range of -40℃ to 80℃, and demonstrates good rigidity, transparency, and lightweight properties. It also possesses excellent flame retardancy. Considering that current power cables often use cross-linked polyethylene (XLPE) for their insulation layers, using polyethylene for the sheath would negatively impact overall mechanical strength and amplify its inherent weaknesses. Therefore, PVC is chosen as the primary sheath material, leveraging its complementary properties with polyethylene to enhance overall mechanical strength. Furthermore, considering that high-speed rail power cables are primarily laid in prefabricated cable trenches, with direct-buried sections protected by cement cable troughs, and mostly within railway protection zones where they are rarely threatened by large machinery, the actual operating environment and potential fault causes are carefully considered to select appropriate materials and processes, ensuring the safe use of the cable.

[0020] The interwoven skeleton 8 in this embodiment is made of nylon 6 fiber. The interwoven skeleton 8 provides good tensile strength for the nylon 6 fiber. Considering that power cables are mostly subjected to radial forces, a straight-through method could easily lead to gaps between fibers becoming the breaking point. Therefore, during production, the nylon 6 fiber should be embedded in the polyvinyl chloride (PVC) material in a cross-linked mesh form. After the PVC material cools, the spatial structure of the nylon 6 skeleton material is maintained, giving it considerable radial strength. Environmentally friendly materials are selected, meeting environmental requirements. The raw materials, byproducts of the production process, and the on-site laying, installation, and cable head fabrication processes should not release toxic or harmful substances to prevent impacts on personnel and the environment.

[0021] In this embodiment, the overall thickness of the outer sheath 6 and the inner sheath 7 is 4mm, and the material proportion of the interwoven skeleton 8 is more than 38%. Its mechanical properties can reach the level of steel wire sheath and are slightly stronger than those of steel strip sheath, especially its bending resistance and puncture resistance are stronger than those of steel strip sheath. By selecting appropriate materials and specifications, costs can be saved, facilitating large-scale application and avoiding waste.

[0022] In this embodiment, the insulating shielding layer 2 is made of polyethylene. There is a filler 5 between the polyvinyl chloride sheath of the inner sheath 7 and the cross-linked polyethylene insulating layer of the insulating shielding layer 2. A metal shielding layer 3 is also provided outside the insulating shielding layer 2 to prevent stress concentration and breakage caused by adhesion.

[0023] Working principle: During use, the interwoven skeleton 8 of nylon fabric has high strength, wear resistance, good lubricity and ductility, and a certain degree of insulation. It can withstand the weight and bending torsion of the cable during production, transportation, laying and installation. In the event of external damage, the outer sheath 6 and inner sheath 7 can resist a certain degree of damage, thus ensuring the relative safety of the main insulation. In addition, polyethylene or polyvinyl chloride is used to form a double-layer sheath system with the existing cross-linked polyethylene outer sheath, replacing the original steel armor, in order to meet the special needs of power cables in the cold Northeast region. It is suitable for use in the main line, within the protective net or protection zone where there is no external interference.

[0024] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A double-jacketed power cable suitable for use in high-cold regions, comprising a plurality of conductors (1), characterized in that, An insulating shielding layer (2) is provided around the periphery of each of the multiple conductors (1), and a metal shielding layer (3) is provided around the periphery of each of the multiple metal shielding layers (3). A protective layer (4) is provided around the periphery of each of the multiple metal shielding layers (3), and a filler (5) is provided between the protective layer (4) and the multiple metal shielding layers (3). The protective layer (4) includes an outer sheath (6), an inner sheath (7), and an interwoven skeleton (8). The interwoven skeleton (8) is embedded between the outer sheath (6) and the inner sheath (7), and the interwoven skeleton (8) is made of nylon fabric.

2. A double-jacketed power cable suitable for use in alpine regions according to claim 1, characterized in that, The outer sheath (6) and the inner sheath (7) are made of polyvinyl chloride.

3. The double-jacketed power cable suitable for use in alpine regions according to claim 2, characterized in that, The interwoven skeleton (8) is made of nylon 6 fiber.

4. The double-jacketed power cable suitable for use in alpine regions according to claim 3, characterized in that, The overall thickness of the outer sheath (6) and the inner sheath (7) is 4 mm, and the material proportion of the interwoven skeleton (8) is more than 38%.

5. The double-jacketed power cable suitable for use in alpine regions according to claim 1, characterized in that, The insulating shielding layer (2) is made of polyethylene.

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