Novel intelligent high-performance non-armored flame-retardant fireproof medium-voltage cable

Abstract

The utility model provides a novel intelligent high-performance non-armored flame-retardant fireproof medium-voltage cable, which comprises a wire core, a shielding layer group coating the periphery of the wire core, an inner isolation layer coating the periphery of the shielding layer group, a flame-retardant layer group coating the periphery of the inner isolation layer, and an outer sheath layer coating the periphery of the flame-retardant layer group, the flame-retardant layer group comprises a first flame-retardant belt wrapping the periphery of the inner isolation layer, an outer isolation layer wrapping the first flame-retardant belt, and a second flame-retardant belt wrapping the outer isolation layer, the wire core is formed by twisting a compound stranded intelligent conductor structure, and the compound stranded intelligent conductor structure is composed of a communication unit, a conductor main body, a communication unit, a communication unit, a communication unit, a communication unit and a communication unit. The one or more reinforcing layers are coated on the periphery of the conductor main body. The flame-retardant performance of the cable can be remarkably improved by arranging the multi-layer flame-retardant structure, and the intelligent degree of the cable can be remarkably improved by arranging the multiple-stranded intelligent conductor structure. The cable has the advantages of high mechanical strength, strong fire resistance, long service life and convenience in popularization and implementation.

Description

Technical Field

[0001] This application belongs to the field of new cable production technology, specifically relating to a new type of intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable. Background Technology

[0002] In existing technologies, medium-voltage cables play a crucial role in power transmission, efficiently transmitting electrical energy and ensuring the stable operation of power systems. However, current medium-voltage cables on the market have some shortcomings in terms of mechanical properties, fire resistance, flame retardancy, and environmental performance.

[0003] In the existing technology, traditional medium-voltage cables have poor mechanical performance, poor bending performance, and a large bending radius, usually requiring at least 20 times the cable diameter, which is not conducive to transportation and construction, and the laying space is large and installation is difficult.

[0004] Regarding fire resistance, the outer steel strip of existing cables only serves as a fire barrier and has virtually no heat insulation function. Therefore, the inner insulation layer needs to be quite thick. However, an excessively thick insulation layer can affect the current carrying capacity of the cable under normal use. In particular, mineral-based fire-resistant insulation structures: when the cable is exposed to fire, the outer sheath is burned first, and the inner fire-resistant expansion insulation sleeve lacks strong protection. Under severe conditions such as water spray and vibration, the mineral-based fire-resistant insulation layer is easily damaged, making it difficult to guarantee a dynamic and safe power supply for a long period after a fire.

[0005] In terms of flame retardant performance, the flame retardant effect of existing cables needs to be improved, and they cannot meet the high requirements for flame retardant performance in some special occasions.

[0006] In terms of intelligence, existing cables only have basic conductive functions and lack the ability to monitor and provide feedback on parameters such as current, voltage, and temperature in real time, which cannot meet the needs of modern electrical systems for intelligence and adaptability.

[0007] Therefore, in order to comprehensively improve the mechanical properties, fire resistance, flame retardancy, and environmental performance of medium-voltage cables, it is now urgent to make improvements to enhance the user experience and performance of the cables. Utility Model Content

[0008] To address the shortcomings of existing medium-voltage cables in terms of mechanical properties, fire resistance, ease of construction, and level of intelligence, which make it difficult to meet the performance requirements of modern power systems, this application proposes a novel intelligent, high-performance, unarmored, flame-retardant, and fire-resistant medium-voltage cable.

[0009] This application adopts the following scheme: a novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable, comprising a conductor core, a shielding layer group covering the outer periphery of the conductor core, an inner isolation layer covering the outer periphery of the shielding layer group, a flame-retardant layer group covering the outer periphery of the inner isolation layer, and an outer sheath layer covering the outer periphery of the flame-retardant layer group. The flame-retardant layer group includes a first flame-retardant strip wrapped around the outer periphery of the inner isolation layer, an outer isolation layer covering the first flame-retardant strip, and a second flame-retardant strip covering the outer isolation layer. The conductor core is formed by stranding one or more strands of a twisted intelligent conductor structure. The twisted intelligent conductor structure is formed by stranding a communication unit, a conductor body wound around the outer periphery of the communication unit, and one or more reinforcing layers covering the outer periphery of the conductor body.

[0010] In some feasible embodiments, the flame-retardant layer assembly further includes a mica tape extruded between the outer insulating layer and the second flame-retardant strip.

[0011] In some feasible embodiments, the inner insulating layer is made of any one of ceramicized silicone tape, ethylene propylene rubber, polytetrafluoroethylene, or polystyrene.

[0012] In some feasible embodiments, the materials of the first flame-retardant strip and the second flame-retardant strip are both selected from glass fiber, cross-linked polyethylene, and magnesium oxide.

[0013] In some feasible embodiments, the outer insulating layer is made of any one of ceramicized polyolefin, ceramicized silicone, or fireproof putty.

[0014] In some feasible embodiments, the shielding layer group includes a first shielding layer covering the outer periphery of the wire core, an insulating layer covering the outer periphery of the first shielding layer, a second shielding layer covering the outer periphery of the insulating layer, and a third shielding layer covering the outer periphery of the second shielding layer.

[0015] In some feasible embodiments, the material of the first shielding layer is selected from any one of ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and graphene;

[0016] The material of the second shielding layer is selected from either ethylene-butyl acrylate copolymer or conductive carbon black;

[0017] The material of the third shielding layer is selected from any one of copper foil, aluminum foil, tin-plated copper, and stainless steel.

[0018] In some feasible embodiments, the thickness of the first shielding layer is greater than the thickness of the second shielding layer, and the thickness of the second shielding layer is greater than the thickness of the third shielding layer.

[0019] In some feasible embodiments, both the insulating layer and the outer sheath are made of polyvinyl chloride or cross-linked polyethylene.

[0020] In some feasible embodiments, the number of the twisted smart conductor structures is defined as Z, where Z satisfies the following relationship: 1≤Z≤5.

[0021] In some feasible embodiments, a third flame-retardant strip 43 is also included, which is extruded onto the second flame-retardant strip.

[0022] In some feasible embodiments, when the twisted smart conductor structure has multiple strands, filler material 7 is also filled between the multiple strands of the twisted smart conductor structure.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] This application provides a novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable, comprising a conductor core, a shielding layer group covering the outer periphery of the conductor core, an inner isolation layer covering the outer periphery of the shielding layer group, a flame-retardant layer group covering the outer periphery of the inner isolation layer, and an outer sheath layer covering the outer periphery of the flame-retardant layer group. The flame-retardant layer group includes a first flame-retardant strip wrapped around the outer periphery of the inner isolation layer, an outer isolation layer wrapped around the first flame-retardant strip, and a second flame-retardant strip wrapped around the outer isolation layer. The conductor core is formed by stranding a complex intelligent conductor structure, which is composed of a communication unit, a conductor body, and one or more reinforcing layers stranded around the outer periphery of the conductor body. By setting a multi-layer flame-retardant structure, the flame-retardant performance of the cable can be significantly improved. By setting a complex intelligent conductor structure, the intelligence level of the cable can be significantly improved. It has the advantages of high mechanical strength, strong fire resistance, long service life, and ease of promotion and implementation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of a novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable in single-core state according to this application.

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of a novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable in the multi-core state according to this application.

[0027] Figure 3 This is a schematic diagram of the cross-sectional structure of a twisted smart conductor structure according to this application;

[0028] Figure 4 This application Figure 3 A magnified view of a section at point A in the middle;

[0029] Figure 5 This is a structural schematic diagram of the strengthening unit of this application;

[0030] Figure 6This is a cross-sectional structural diagram of the communication unit of this application. Detailed Implementation

[0031] Combination Figure 1-6 The content shown further illustrates the technical solution provided in this application: a novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable, comprising a conductor core 1, a shielding layer group 2 covering the outer periphery of the conductor core 1, an inner isolation layer 3 covering the outer periphery of the shielding layer group 2, a flame-retardant layer group 4 covering the outer periphery of the inner isolation layer 3, and an outer sheath layer 5 covering the outer periphery of the flame-retardant layer group 4. The flame-retardant layer group 4 includes a first flame-retardant strip 40 wrapped around the outer periphery of the inner isolation layer 3, an outer isolation layer 41 covering the first flame-retardant strip 40, and a second flame-retardant strip 42 covering the outer isolation layer 41. The conductor core 1 is formed by twisting one or more strands of a twisted intelligent conductor structure U. The twisted intelligent conductor structure U is formed by twisting a communication unit B1, a conductor body A1 wound around the outer periphery of the communication unit B1, and one or more reinforcing layers A2 covering the outer periphery of the conductor body A1.

[0032] This application provides a novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable, comprising a conductor core, a shielding layer group covering the outer periphery of the conductor core, an inner isolation layer covering the outer periphery of the shielding layer group, a flame-retardant layer group covering the outer periphery of the inner isolation layer, and an outer sheath layer covering the outer periphery of the flame-retardant layer group. The flame-retardant layer group includes a first flame-retardant strip wrapped around the outer periphery of the inner isolation layer, an outer isolation layer wrapped around the first flame-retardant strip, and a second flame-retardant strip wrapped around the outer isolation layer. The conductor core is formed by stranding a complex intelligent conductor structure, which is composed of a communication unit, a conductor body, and one or more reinforcing layers stranded around the outer periphery of the conductor body. By setting a multi-layer flame-retardant structure, the flame-retardant performance of the cable can be significantly improved. By setting a complex intelligent conductor structure, the intelligence level of the cable can be significantly improved. It has the advantages of high mechanical strength, strong fire resistance, long service life, and ease of promotion and implementation.

[0033] In this embodiment, the flame-retardant layer group 4 further includes a mica strip 6 extruded between the outer isolation layer 41 and the second flame-retardant strip 42.

[0034] In this embodiment, the inner isolation layer 3 is made of any one of ceramicized silicone tape, ethylene propylene rubber, polytetrafluoroethylene, or polystyrene.

[0035] In actual implementation, the inner isolation layer 3 is made of ceramicized silicone tape.

[0036] In actual implementation, ceramicized silicone tape is a commonly used material in this field (see URL A below), and will not be elaborated here.

[0037] Website A: http: / / www.wave-vector.com / productDe_62.html.

[0038] In this embodiment, the materials of the first flame-retardant strip 40 and the second flame-retardant strip 42 are all selected from glass fiber, cross-linked polyethylene, and magnesium oxide.

[0039] In actual implementation, both the first flame-retardant strip 40 and the second flame-retardant strip 42 are made of glass fiber.

[0040] In this embodiment, the outer isolation layer 41 is made of any one of ceramicized polyolefin, ceramicized silicone, or fireproof putty.

[0041] In actual implementation, the outer isolation layer 41 is made of ceramicized polyolefin.

[0042] In actual implementation, ceramicized polyolefins are commonly used materials in this field (see URL B below), and will not be elaborated here.

[0043] Website B: https: / / www.keter.com.cn / product / 229.html

[0044] In this embodiment, the shielding layer group 2 includes a first shielding layer 20 covering the outer periphery of the wire core 1, an insulating layer 21 covering the outer periphery of the first shielding layer 20, a second shielding layer 22 covering the outer periphery of the insulating layer 21, and a third shielding layer 23 covering the outer periphery of the second shielding layer 22.

[0045] In this embodiment, the material of the first shielding layer 20 is selected from any one of ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and graphene.

[0046] In actual implementation, the material of the first shielding layer 20 is ethylene-vinyl acetate copolymer.

[0047] The material of the second shielding layer 22 is selected from either ethylene-butyl acrylate copolymer or conductive carbon black;

[0048] In actual implementation, the material of the second shielding layer 22 is ethylene-butyl acrylate copolymer.

[0049] The material of the third shielding layer 23 is selected from any one of copper foil, aluminum foil, tin-plated copper, and stainless steel.

[0050] In actual implementation, the material of the third shielding layer 23 is copper foil.

[0051] In this embodiment, the thickness of the first shielding layer 20 is greater than the thickness of the second shielding layer 22, and the thickness of the second shielding layer 22 is greater than the thickness of the third shielding layer 23.

[0052] In this embodiment, the insulating layer 21 and the outer sheath layer 5 are both made of polyvinyl chloride or cross-linked polyethylene.

[0053] In this embodiment, the core 1 is formed by twisting one or more strands of twisted conductor structure X together. The number of stranded conductor structures X is defined as Z, and Z satisfies the following relationship: 1≤Z≤5.

[0054] like Figure 2 As shown, in actual implementation, a third flame-retardant strip 43 is also included, which is extruded onto the outer periphery of the second flame-retardant strip.

[0055] like Figure 2 As shown, in actual implementation, when the twisted intelligent conductor structure has multiple strands, filler material 7 is also filled between the multiple strands of the twisted intelligent conductor structure.

[0056] In actual implementation, the twisted intelligent conductor structure U is formed by twisting together a communication unit B1, a conductor body A1 wound around the outer periphery of the communication unit B1, and one or more reinforcing layers A2 covering the outer periphery of the conductor body A1. Each reinforcing layer A2 includes multiple reinforcing units A3 spaced around the axis of the conductor body A1 on the outer periphery of the conductor body A1, and connecting units A4 between adjacent reinforcing units A3. The number of reinforcing layers A2 is defined as N, and N satisfies the following relationship: 1≤N<5.

[0057] In actual implementation, N=3.

[0058] In this embodiment, the communication unit B1 includes a tensile element B10, multiple communication optical fibers B11 wound around the outer periphery of the tensile element B10, and a tubular support B12 disposed around the outer periphery of the multiple communication optical fibers B11. The tensile element B10 is made of any one of aramid fiber, carbon fiber, polyester fiber, and nylon fiber, and the tubular support B12 is made of metal.

[0059] In actual implementation, the communication optical fiber is used for signal transmission, parameter measurement, or parameter monitoring.

[0060] In actual implementation, by setting tensile elements, the tensile strength of communication unit B1 can be effectively improved, avoiding the problem of fiber optic cable being pulled or broken during the production process.

[0061] In actual implementation, aramid fiber is selected as the material for tensile components.

[0062] In practical implementation, the structural design of communication unit B1 has yielded significant benefits. The tensile element B10, made of aramid fiber, not only effectively enhances the tensile strength of communication unit B1 but also reduces overall weight, improving the mechanical strength and durability of the conductor structure. The tubular support B12, made of metal, provides stable support and protection for the communication fiber B11, preventing external physical damage during use. It also enhances the overall structural stability of communication unit B1, improving its reliability in complex environments. Furthermore, the good thermal conductivity of the metal tubular support B12 aids in heat dissipation, extending the service life of the communication fiber B11. The communication fiber B11, wound around the outer periphery of the tensile element B10, achieves efficient signal transmission, offering advantages such as large transmission bandwidth, low signal attenuation, and strong anti-electromagnetic interference capabilities, meeting the demands of modern electrical systems for high-speed, stable communication. This design organically combines the tensile element B10, the communication fiber B11, and the tubular support B12, ensuring both the mechanical performance of communication unit B1 and efficient signal transmission, thus improving the overall performance and application range of the twisted intelligent conductor structure.

[0063] In this embodiment, the conductor body A1 is formed by twisting together multiple conductor single wires A10. The number of conductor single wires A10 is defined as M, and M satisfies the following relationship: 3 < M < 25.

[0064] In actual implementation, M=19.

[0065] In this embodiment, the reinforcing unit A3 is made of the same material as the conductor monofilament A10.

[0066] In this embodiment, the conductor monofilament A10 is made of any one of the following materials: T1 copper, T2 copper, 1050 aluminum, 1060 aluminum, tin-plated copper, or nickel-plated copper.

[0067] In actual implementation, the conductor single wire A10 is made of T1 copper.

[0068] In actual implementation, using T1 copper as the conductor monofilament material can significantly improve the conductor's conductivity, mechanical strength, and durability, while reducing production costs and maintenance difficulty, demonstrating significant technical advantages and practical application value.

[0069] In actual implementation, the reinforcing unit A3 is made of the same material as the conductor monofilament A10. This can effectively improve the conductivity of the conductor structure and prevent electrochemical reactions between the reinforcing layer and the conductor body.

[0070] In this embodiment, the twisting direction of the multiple conductor wires A10 and the communication unit B1 is defined as A, and the twisting direction of the conductor body A1 and one or more reinforcing layers A2 is defined as B, where A and B are the same.

[0071] In this embodiment, the pitch ratio of the multiple conductor wires A10 to the communication unit B1 during the twisting process is selected to be 15-20;

[0072] The pitch ratio of the conductor body A1 and one or more reinforcing layers A2 during the stranding process is selected to be 12-18.

[0073] In actual implementation, the pitch ratio of the multiple conductor wires A10 during the stranding process is selected as 18.

[0074] In actual implementation, the pitch ratio of the conductor body A1 and one or more reinforcing layers A2 during the stranding process is selected as 16.

[0075] In this embodiment, the connecting unit A4 includes connecting grooves A40 that are staggered on both sides of the reinforcing unit A3, and connecting protrusions A41 that are staggered on both sides of the reinforcing unit A3. The connecting protrusions A41 between two adjacent reinforcing units A3 can be matched and extended into the connecting grooves A40 so that the two reinforcing units A3 can be connected.

[0076] In this embodiment, the cross-sectional shape of the connecting groove A40 is semi-circular, and the shape of the connecting protrusion A41 matches the shape of the connecting groove A40.

[0077] In this embodiment, multiple reinforcing units A3 are arranged in a spiral pattern around the axis of the conductor body A1 and on the outer periphery of the conductor body A1.

[0078] In actual implementation, one or more interlocking reinforcing layers are set around the conductor body, which can effectively improve the structural stability of the conductor body and solve the overturning problem inherent in conventional conductor structures.

[0079] Furthermore, by setting one or more interlocking reinforcing layers around the conductor body, the conductor structure provided in this application does not involve any type of compression during stranding, thus preventing conductor hardening and increased conductor resistance, resulting in superior conductivity under the same cross-sectional conditions. The conductor structure has a smooth surface, eliminating conductor tip discharge and effectively improving cable lifespan.

[0080] This application provides a novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable, comprising a conductor core, a shielding layer group covering the outer periphery of the conductor core, an inner isolation layer covering the outer periphery of the shielding layer group, a flame-retardant layer group covering the outer periphery of the inner isolation layer, and an outer sheath layer covering the outer periphery of the flame-retardant layer group. The flame-retardant layer group includes a first flame-retardant strip wrapped around the outer periphery of the inner isolation layer, an outer isolation layer wrapped around the first flame-retardant strip, and a second flame-retardant strip wrapped around the outer isolation layer. The conductor core is formed by stranding a complex intelligent conductor structure, which is composed of a communication unit, a conductor body, and one or more reinforcing layers stranded around the outer periphery of the conductor body. By setting a multi-layer flame-retardant structure, the flame-retardant performance of the cable can be significantly improved. By setting a complex intelligent conductor structure, the intelligence level of the cable can be significantly improved. It has the advantages of high mechanical strength, strong fire resistance, long service life, and ease of promotion and implementation.

[0081] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable, characterized in that, The device includes a wire core (1), a shielding layer group (2) covering the outer periphery of the wire core (1), an inner isolation layer (3) covering the outer periphery of the shielding layer group (2), a flame-retardant layer group (4) covering the outer periphery of the inner isolation layer (3), and an outer sheath layer (5) covering the outer periphery of the flame-retardant layer group (4). The flame-retardant layer group (4) includes a first flame-retardant strip (40) wrapped around the outer periphery of the inner isolation layer (3), and a flame-retardant strip (40) covering the outer periphery of the first flame-retardant strip (40). The outer insulating layer (41) on the core (0) and the second flame-retardant strip (42) covering the outer insulating layer (41) are provided. The core (1) is formed by twisting one or more strands of a twisted intelligent conductor structure (U). The twisted intelligent conductor structure (U) is formed by twisting a communication unit (B1), a conductor body (A1) wound around the outer periphery of the communication unit (B1), and one or more reinforcing layers (A2) covering the outer periphery of the conductor body (A1).

2. The novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 1, characterized in that, The flame-retardant layer group (4) also includes a mica tape (6) extruded between the outer insulating layer (41) and the second flame-retardant tape (42).

3. The novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 1, characterized in that, The inner isolation layer (3) is made of any one of ceramicized silicone tape, ethylene propylene rubber, polytetrafluoroethylene, or polystyrene.

4. The novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 1, characterized in that, The materials of the first flame-retardant strip (40) and the second flame-retardant strip (42) are both selected from glass fiber, cross-linked polyethylene, and magnesium oxide.

5. A novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 1, characterized in that, The outer isolation layer (41) is made of any one of ceramicized polyolefin, ceramicized silicone, or fireproof putty.

6. The novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 1, characterized in that, The shielding layer group (2) includes a first shielding layer (20) covering the outer periphery of the wire core (1), an insulating layer (21) covering the outer periphery of the first shielding layer (20), a second shielding layer (22) covering the outer periphery of the insulating layer (21), and a third shielding layer (23) covering the outer periphery of the second shielding layer (22).

7. A novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 6, characterized in that, The material of the first shielding layer (20) is selected from any one of ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and graphene; The material of the second shielding layer (22) is selected from either ethylene-butyl acrylate copolymer or conductive carbon black; The material of the third shielding layer (23) is selected from any one of copper foil, aluminum foil, tin-plated copper, and stainless steel.

8. A novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 6, characterized in that, The thickness of the first shielding layer (20) is greater than the thickness of the second shielding layer (22), and the thickness of the second shielding layer (22) is greater than the thickness of the third shielding layer (23).

9. A novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 6, characterized in that, The insulating layer (21) and the outer sheath layer (5) are both made of polyvinyl chloride or cross-linked polyethylene.

10. A novel intelligent high-performance unarmored flame-retardant and fire-resistant medium-voltage cable according to claim 1, characterized in that, The number of the twisted smart conductor structures (U) is defined as Z, and Z satisfies the following relationship: 1≤Z≤5.

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