Large-section high-voltage cable

Abstract

The utility model relates to a large-cross-section high-voltage cable, which comprises a central conductor, and a first insulating tape, a twisted first concentric conductor layer, a second insulating tape, a twisted second concentric conductor layer, a third insulating tape, a twisted third concentric conductor layer, a fourth insulating tape and a twisted fourth concentric conductor layer are wrapped outside the central conductor. A first semi-conductive belt, a winding shaping copper belt, a second semi-conductive belt, an extruded conductor shield, an extruded insulation, an extruded insulation shield, a winding buffer layer, an extruded inner cushion layer, extruded conductive rubber outside a conductor, a plurality of conductive wire cores extruded with the conductive rubber are tightly wound outside the inner cushion layer, an extruded outer cushion layer, an extruded inner sheath, a longitudinal waterproof layer and an extruded outer sheath. According to the utility model, the conductor adopts a layered composite stranded structure, and the conductive wire core formed by extruding conductive rubber by a plurality of stranded copper wires is tightly wound outside to form the conductive sheath, so that the overall structure of the cable is soft.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to a high-voltage cable. Background Art

[0002] High-voltage cables generally adopt a tightly compressed circular or tightly compressed stranded block segmented conductor structure, with a metal sheath on the outside. The larger the cross-section of the cable, the higher the overall hardness of the cable and the smaller the flexibility. In some occasions where the cable needs to have flexibility, the cable is prone to damage during laying and use. Content of the Utility Model

[0003] Object of the Invention: The object of the utility model is to overcome the deficiencies in the prior art and provide a large cross-section high-voltage cable with a conductor adopting a layered composite stranded structure, an outer conductor core tightly wound with multiple stranded copper wires extruded with conductive rubber to form a conductive sheath, and the overall structure of the cable being flexible.

[0004] Technical Solution: To solve the above technical problems, a large cross-section high-voltage cable described in the utility model includes a central conductor, with a first insulating tape wound around the central conductor, a first concentric conductor layer stranded, a second insulating tape wound, a second concentric conductor layer stranded, a third insulating tape wound, a third concentric conductor layer stranded, a fourth insulating tape wound, a fourth concentric conductor layer stranded, a first semi-conductive tape wound, a shaped copper tape wound, a second semi-conductive tape wound, a conductor shield extruded, an insulation extruded, an insulation shield extruded, a buffer layer wound, an inner cushion layer extruded, conductive rubber extruded on the conductor, multiple conductor cores extruded with conductive rubber tightly wound outside the inner cushion layer, an outer cushion layer extruded, an inner sheath extruded, a waterproof layer longitudinally wrapped, and an outer sheath extruded.

[0005] Further, the central conductor adopts a composite stranded copper conductor with a cross-sectional area greater than 200 mm 2 , the number of composite strands is not less than 37 strands, the number of single wires per strand is not more than 35 wires, the diameter of the single wire is not greater than 0.51 mm, the pitch diameter ratio of the strand bunch stranding is not greater than 30, and the pitch diameter ratio of the composite stranding is not greater than 25.

[0006] Further, the conductor adopts a copper stranded wire with a single wire diameter not greater than 0.51 mm, and the total cross-sectional area of the conductor is not less than 95 mm 2 ; the conductive rubber is made of a rubber-type semi-conductive material with a resistivity not greater than 500 Ω·m and a thickness of the conductive rubber not less than 0.8 mm.

[0007] Furthermore, the first concentric conductor layer, the second concentric conductor layer, the third concentric conductor layer, and the fourth concentric conductor layer adopt a structure of two-layer strand superposed and complex-stranded. The number of strands in the two layers within each concentric conductor layer is the same. The cross-sectional area of each concentric conductor layer is equal to the cross-sectional area of the central conductor. The number of single wires in each strand is no more than 30, the diameter of each single wire is no more than 0.51 mm, the pitch diameter ratio of the strand bunching is no more than 30, and the pitch diameter ratio of the complex stranding is no more than 25. The first insulating tape, the second insulating tape, the third insulating tape, and the fourth insulating tape are formed by overlapping and winding a polytetrafluoroethylene insulating tape, with an overlapping rate of no less than 30%, and the thickness of each layer of insulating tape is 0.15 - 0.20 mm.

[0008] Furthermore, the first semiconductive tape and the second semiconductive tape are overlapped and wound, with an overlapping rate of no less than 30%, and the thickness of each layer of semiconductive layer is 0.10 - 0.12 mm.

[0009] Furthermore, the shaped copper tape is wound with a hard copper tape at intervals, with an interval rate of 30% - 40%, and the strength of the copper tape is greater than 385 N / mm 2 .

[0010] Furthermore, the conductor shield is made of a rubber-type semiconductive material, with a resistivity of no more than 1000 Ω·m, and the thickness of the conductor shield is 1.0 - 1.2 mm; the insulation is made of ethylene propylene rubber, with a thickness of no less than 18.5 mm; the insulation shield is made of a rubber-type semiconductive material, with a resistivity of no more than 500 Ω·m, and the thickness of the insulation shield is 1.2 - 1.6 mm.

[0011] Furthermore, the buffer layer adopts a semiconductive water-resistant buffer tape, which is formed by overlapping and winding two layers, with an overlapping rate of no less than 30%, and the thickness of each single layer is no less than 2.0 mm.

[0012] Furthermore, the inner cushion layer is made of a rubber-type semiconductive material, with a resistivity of no more than 500 Ω·m, and the thickness of the inner cushion layer is no less than 1.4 mm; the outer cushion layer is made of a rubber-type semiconductive material, with a resistivity of no more than 500 Ω·m, and the thickness of the outer cushion layer is no less than 2.0 mm.

[0013] Furthermore, the inner sheath adopts a chlorinated polyethylene rubber sheath, with a thickness of no less than 4.5 mm, the outer sheath adopts medium-density polyethylene, with a strength of no less than 10 N / mm 2 , with a thickness of 1.6 - 2.0 mm. The waterproof layer is longitudinally wrapped with an aluminum-plastic composite tape, with a thickness of no less than 0.35 mm, and the plastic layer is no less than 0.05 mm. When longitudinally wrapping, the plastic layer faces outward and merges with the outer sheath during extrusion to form an integral body.

[0014] Beneficial effects: Compared with the prior art, the remarkable advantages of the present utility model are:

[0015] In the present utility model, the conductor consists of a central layer and four or five concentric outer layers. The total cross-sectional area of the conductor is greater than 1000 mm 2 , and the cross-sectional area of each layer of the conductor is equal. An insulating tape is provided between layers to separate them, reducing the current skin effect and improving the conduction efficiency. The central layer adopts a composite stranded structure, and the concentric layer structure adopts a two-layer superimposed composite stranded structure. A copper tape is spirally wound outside the conductor with a gap to stabilize the conductor structure;

[0016] The insulation uses ethylene propylene rubber;

[0017] A semiconductive rubber inner cushion layer is extruded outside the buffer layer;

[0018] Multiple stranded copper wires are tightly wound with a conductive rubber wire core, which serves as a path for capacitive current and short-circuit current and has an electric field shielding effect;

[0019] The cable sheath has a comprehensive structure of a rubber inner sheath + an aluminum-plastic composite tape + a polyethylene outer sheath, which has a waterproof function, protects the internal structure of the cable, and maintains the flexibility of the cable. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is a schematic diagram of the central conductor, the first insulating tape, the first concentric conductor layer, the second insulating tape, the second concentric conductor layer, the third insulating tape, the third concentric conductor layer, the fourth insulating tape, the fourth concentric conductor layer, and the first semiconductive tape in the present utility model;

[0022] Figure 3 is a schematic diagram of the central conductor, the first insulating tape, and the first concentric conductor layer in the present utility model. Detailed Embodiment

[0023] The present utility model will be further described below with reference to the drawings and embodiments.

[0024] As shown in Figure 1 , Figure 2 and Figure 3As shown in the figure, for a large cross-section high-voltage cable of the present utility model, a first insulating tape 2 is wrapped around the central conductor 1, the first concentric conductor layer 3 is stranded, a second insulating tape 4 is wrapped, the second concentric conductor layer 5 is stranded, a third insulating tape 6 is wrapped, the third concentric conductor layer 7 is stranded, a fourth insulating tape 8 is wrapped, the fourth concentric conductor layer 9 is stranded, a first semiconductive tape 10 is wrapped, a shaped copper tape 11 is wrapped, a second semiconductive tape 12 is wrapped, a conductor shield 13 is extruded, an insulation 14 is extruded, an insulation shield 15 is extruded, a buffer layer 16 is wrapped, an inner cushion layer 17 is extruded, a conductive rubber 19 is extruded outside the conductor 18, and a plurality of wire cores extruded with conductive rubber are tightly wound outside the inner cushion layer 17, an outer cushion layer 20 is extruded, an inner sheath 21 is extruded, a waterproof layer 22 is longitudinally wrapped, and an outer sheath 23 is extruded.

[0025] The central conductor 1 is a stranded copper conductor with a cross-sectional area greater than 200 mm 2 , the number of stranded strands is not less than 37, the number of single wires per strand is not more than 35, and the single wire diameter is not greater than 0.51 mm. The pitch diameter ratio of the strand bundle stranding is not greater than 30, and the pitch diameter ratio of the composite stranding is not greater than 25.

[0026] The first insulating tape 2, the second insulating tape 4, the third insulating tape 6, and the fourth insulating tape 8 are overlapped and wrapped with polytetrafluoroethylene insulating tapes, and the overlapping rate is not less than 30%. The thickness of the insulating tape is 0.15 - 0.20 mm, which separates the conductors layer by layer, reduces the current skin effect, and improves the conduction efficiency.

[0027] The first concentric conductor layer 3, the second concentric conductor layer 5, the third concentric conductor layer 7, and the fourth concentric conductor layer 9 adopt a two-layer strand superposition and composite stranding structure. The number of strands in the two layers within each concentric conductor layer is the same, and the cross-sectional area of each concentric conductor layer is equal to the cross-sectional area of the central conductor 1. The number of strands per strand is not greater than 30, and the single wire diameter is not greater than 0.51 mm. The pitch diameter ratio of the strand bundle stranding is not greater than 30, and the pitch diameter ratio of the composite stranding is not greater than 25.

[0028] The first semiconductive tape 10 and the second semiconductive tape 12 are overlapped and wrapped, and the overlapping rate is not less than 30%, and the thickness is 0.10 - 0.12 mm.

[0029] The shaped copper tape 11 is wrapped with a hard copper tape at intervals, and the gap rate is 30% - 40%. The strength of the copper tape is greater than 385 N / mm 2 , which wraps and tightens to stabilize the conductor structure, and the gap during wrapping ensures the flexibility of the cable during bending.

[0030] The conductor shield 13 is made of a rubber-type semiconductive material with a resistivity not greater than 1000 Ω·m. The thickness of the conductor shield 13 is 1.0 - 1.2 mm.

[0031] The insulation 14 is made of ethylene propylene rubber with a thickness not less than 18.5 mm and excellent insulation performance.

[0032] The insulating shield 15 is made of a rubber-type semiconductive material with a resistivity not greater than 500 Ω·m. The thickness of the insulating shield 15 is 1.2 - 1.6 mm.

[0033] The buffer layer 16 is made of a semiconductive water-resistant buffer tape. Two layers are overlapped and wrapped, with an overlap rate not less than 30%, and the single-layer thickness not less than 2.0 mm. After the buffer layer 16 is wrapped, it has compressibility, and the compression rate is not less than 40%. When the cable is operating, the insulation compresses the buffer layer 16 due to the increase in thermal expansion without damaging the cable structure.

[0034] The inner cushion layer 17 is made of a rubber-type semiconductive material with a resistivity not greater than 500 Ω·m. The thickness of the inner cushion layer 17 is not less than 1.4 mm.

[0035] The conductor 18 is made of stranded copper wires with a single-wire diameter not greater than 0.51 mm. The total cross-section of the conductor meets the requirements of capacitive current and short-circuit current, not less than 95 mm 2 。

[0036] The conductive rubber 19 is made of a rubber-type semiconductive material with a resistivity not greater than 500 Ω·m. The thickness of the conductive rubber 19 is not less than 0.8 mm. The wire core with the extruded conductive rubber 19 is tightly wound outside the inner cushion layer 17, having a conductive function and keeping the cable flexible.

[0037] The outer cushion layer 20 is made of a rubber-type semiconductive material with a resistivity not greater than 500 Ω·m. The thickness of the outer cushion layer 20 is not less than 2.0 mm, and it is extruded in an extrusion manner to fill the gap and become an integral part with the internal structure, being stable and not loose.

[0038] The inner sheath 21 is made of a chlorinated polyethylene rubber sheath with a thickness not less than 4.5 mm to protect the internal structure.

[0039] The waterproof layer 22 is longitudinally wrapped with an aluminum-plastic composite tape with a thickness not less than 0.35 mm and a plastic layer not less than 0.05 mm. When longitudinally wrapping, the plastic layer faces outward and fuses with the outer sheath 23 during extrusion to become an integral part.

[0040] The outer sheath 23 is made of medium-density polyethylene with a strength not less than 10 N / mm 2 ,and the thickness is 1.6 - 2.0 mm. It is extruded simultaneously with the longitudinal wrapping of the waterproof layer 22 and fuses with the plastic layer of the waterproof layer 22 at high temperature to become an integral part, having a waterproof function and stabilizing the cable structure.

[0041] In the present utility model, the conductor is composed of a central layer and four or five concentric outer layers, and the total cross-section of the conductor is greater than 1000 mm 2, the cross-sectional area of the conductor in each layer is equal, and insulating tapes are arranged between layers to separate them, reducing the current skin effect and improving the conduction efficiency. The central layer adopts a composite stranded structure, and the concentric layer structure adopts a two-layer superimposed composite stranded structure. The outer gap of the conductor is helically wound with copper tape to stabilize the conductor structure; the insulation uses ethylene propylene rubber; a semi-conductive rubber inner cushion layer is extruded outside the buffer layer; multiple stranded copper wires are closely wound around the conductive wire core extruded with conductive rubber, which serves as a path for capacitive current and short-circuit current and plays an electric field shielding role; the cable sheath is composed of a comprehensive structure of a rubber inner sheath + an aluminum-plastic composite tape + a polyethylene outer sheath, which has a waterproof function, protects the internal structure of the cable, and maintains the flexibility of the cable.

[0042] The present utility model provides an idea and method. There are many methods and ways to specifically implement this technical solution. The above description is only the preferred implementation mode of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model. Each component not clearly defined in this embodiment can be implemented by using the existing technology.

Claims

1. A high-voltage cable with a large cross-section, characterized in that: It includes a central conductor (1), with a first insulating tape (2) wrapped around the central conductor (1), a first concentric conductor layer (3) stranded, a second insulating tape (4) wrapped, a second concentric conductor layer (5) stranded, a third insulating tape (6) wrapped, a third concentric conductor layer (7) stranded, a fourth insulating tape (8) wrapped, a fourth concentric conductor layer (9) stranded, a first semiconductive tape (10) wrapped, a shaped copper tape (11) wrapped, a second semiconductive tape (12) wrapped, a conductor shield (13) extruded, an insulation (14) extruded, an insulation shield (15) extruded, a buffer layer (16) wrapped, an inner cushion layer (17) extruded, a conductive rubber (19) extruded outside the conductor (18), and multiple conductive rubber-covered conductor cores tightly wound outside the inner cushion layer (17), an outer cushion layer (20) extruded, an inner sheath (21) extruded, a waterproof layer (22) longitudinally wrapped, and an outer sheath (23) extruded.

2. The large cross-section high-voltage cable according to claim 1, characterized in that: The central conductor (1) uses a stranded copper conductor with a cross-sectional area greater than 200 mm 2 , the number of strands in the stranded conductor is not less than 37, the number of single wires in each strand is not more than 35, the diameter of the single wire is not greater than 0.51 mm, the pitch diameter ratio of the strand bunching is not greater than 30, and the pitch diameter ratio of the stranded conductor is not greater than 25.

3. The large cross-section high-voltage cable according to claim 1, characterized in that: The conductor (18) is made of stranded copper wire with a single wire diameter not greater than 0.51 mm and the total cross-sectional area of the conductor not less than 95 mm 2 ; The conductive rubber (19) is made of a rubber-type semi-conductive material with a resistivity not greater than 500 Ω·m, and the thickness of the conductive rubber (19) is not less than 0.8 mm.

4. The large cross-section high-voltage cable according to claim 1, characterized in that: The first concentric conductor layer (3), the second concentric conductor layer (5), the third concentric conductor layer (7), and the fourth concentric conductor layer (9) adopt a structure of two-layer strand superposition and complex stranding. The number of strands in the two layers within each concentric conductor layer is the same. The cross-sectional area of each concentric conductor layer is equal to the cross-sectional area of the central conductor (1). The number of single wires in each strand is not more than 30, the single wire diameter is not more than 0.51 mm, the stranding pitch diameter ratio of the strand bundle is not more than 30, and the complex stranding pitch diameter ratio is not more than 25. The first insulating tape (2), the second insulating tape (4), the third insulating tape (6), and the fourth insulating tape (8) are formed by overlapping and wrapping with polytetrafluoroethylene insulating tapes, with an overlap rate of not less than 30%, and the thickness of each insulating tape layer is 0.15 - 0.20 mm.

5. The large cross-section high-voltage cable according to claim 1, characterized in that: The first semiconductive tape (10) and the second semiconductive tape (12) are overlapped and wrapped, with an overlap rate of not less than 30%, and the thickness of each semiconductive layer is 0.10 - 0.12 mm.

6. The large cross-section high-voltage cable according to claim 1, characterized in that: The shaped copper strip (11) is wound with a hard copper strip with a gap, and the gap rate is 30%-40%. The strength of the copper strip is greater than 385 N / mm 2 .

7. The large cross-section high-voltage cable according to claim 1, characterized in that: The conductor shield (13) is made of a rubber-type semiconductive material with a resistivity of not more than 1000 Ω·m, and the thickness of the conductor shield (13) is 1.0 - 1.2 mm. The insulation (14) is made of ethylene propylene rubber with a thickness of not less than 18.5 mm. The insulation shield (15) is made of a rubber-type semiconductive material with a resistivity of not more than 500 Ω·m, and the thickness of the insulation shield (15) is 1.2 - 1.6 mm.

8. The large cross-section high-voltage cable according to claim 1, wherein: The buffer layer (16) is made of a semiconductive water-resistant buffer tape and is formed by overlapping and wrapping two layers, with an overlap rate of not less than 30% and a single-layer thickness of not less than 2.0 mm.

9. The large cross-section high-voltage cable according to claim 1, characterized in that: The inner cushion layer (17) is made of a rubber-type semiconductive material with a resistivity of not more than 500 Ω·m, and the thickness of the inner cushion layer (17) is not less than 1.4 mm. The outer cushion layer (20) is made of a rubber-type semiconductive material with a resistivity of not more than 500 Ω·m, and the thickness of the outer cushion layer (20) is not less than 2.0 mm.

10. The large cross-section high-voltage cable according to claim 1, characterized in that: The inner sheath (21) is made of chlorinated polyethylene rubber sheath with a thickness of not less than 4.5 mm. The outer sheath (23) is made of medium-density polyethylene with a strength of not less than 10 N / mm 2 , with a thickness of 1.6 - 2.0 mm. The waterproof layer (22) is longitudinally wrapped with an aluminum-plastic composite tape with a thickness of not less than 0.35 mm and a plastic layer of not less than 0.05 mm. When longitudinally wrapping, the plastic layer faces outward and fuses with the outer sheath (23) during extrusion to form an integral whole.

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