High-shielding anti-interference photoelectric composite high-voltage power cable

Abstract

The utility model discloses a high-shielding anti-interference photoelectric composite high-voltage power cable comprising a cable core which is formed by twisting a plurality of photoelectric composite shielding cables. Gaps of the cable core are filled with nano halogen-free high-flame-retardant filling ropes, a semi-conductive nylon tape is wrapped outside the cable core, a tinned copper foil inner shielding layer is wrapped outside the semi-conductive nylon tape, a flame-retardant inner sheath is arranged outside the tinned copper foil inner shielding layer, a semi-conductive buffer water-blocking composite tape is wrapped outside the flame-retardant inner sheath in an overlapping manner, and a flame-retardant outer sheath is arranged outside the tinned copper foil inner shielding layer. Vermiculite flame-retardant cloth is lapped outside the semi-conductive buffer water-blocking composite belt, a steel core composite reinforcing layer is arranged outside the vermiculite flame-retardant cloth, a Lyofilm wave-proof sleeve is arranged outside the steel core composite reinforcing layer, and a ceramic low-smoke halogen-free polyolefin fire-resistant outer sheath is extruded outside the Lyofilm wave-proof sleeve. The cable structure is high in shielding effectiveness, small in dynamic resistance, low in loss, capable of effectively preventing interference of external high-frequency signals, high in signal transmission rate, good in high-temperature resistance, flame retardance, fireproof performance, waterproof performance, mechanical performance, corrosion resistance, aging resistance, weather resistance and the like, environmentally friendly and long in service life.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage cables, specifically to a high-shield, anti-interference type optoelectronic composite high-voltage power cable. Background Technology

[0002] In the process of building the "next-generation power grid," it is particularly important for the State Grid system to adopt technical measures to effectively address the operational safety issues of high-voltage cables. High-voltage cables with fiber optic composite structures represent a new technological development direction, contributing to the high-end development of cable engineering in my country and meeting the "intrinsically safe" requirements of the next-generation power grid.

[0003] Photoelectric composite power cables primarily address the simultaneous transmission of power and signals. Due to their application in special situations, such as connecting coastal islands to the mainland, offshore oil exploration platforms, and transmitting electrical and optical signals from the seabed or underwater in offshore wind farms, these cables must possess certain radial waterproofing properties, and their insulation layer must be corrosion-resistant and impact-resistant. A common design uses a single water-blocking strip. However, when the cable is damaged and the damage penetrates into the conductor, the water-blocking strip within the conductor gaps is insufficient to prevent seawater from penetrating longitudinally along the conductor, potentially forming water trees within the conductor and rendering the entire cable unusable. This results in high repair costs, long repair times, and significant power outage losses.

[0004] High-voltage cable faults often result in decreased insulation levels, increased leakage current, and increased losses, leading to higher temperatures. These higher temperatures further accelerate insulation aging, increase leakage current, and cause even higher temperatures, ultimately leading to insulation breakdown and even fire. Once a fire occurs, the cable is exposed to a high-temperature environment for an extended period, which can damage the conductors and severely impact the cable's electrical and signal transmission performance, rendering it unable to meet usage requirements. Furthermore, existing technologies offer poor anti-interference capabilities for cables.

[0005] In addition, if the conductor uses copper core or tin-plated copper core, although it has good conductivity, it has problems such as high loss and easy corrosion, which cannot meet the requirements of the new energy field for cable performance. Furthermore, the insulation layer and outer sheath materials of such high-voltage cables usually have problems such as poor environmental performance and poor weather resistance, which can easily lead to cable aging and damage, posing hidden dangers to the safe operation of the new energy system and seriously threatening the safe operation of the cable. Utility Model Content

[0006] Purpose of the utility model: In order to overcome the shortcomings of the existing technology, a high-shield anti-interference photoelectric composite high-voltage power cable is provided. The cable has high shielding efficiency, low dynamic resistance, low loss, effectively prevents interference from external high-frequency signals, has a fast signal transmission rate, and has good properties such as high temperature resistance, flame retardancy, fire resistance, water resistance, mechanical properties, corrosion resistance, aging resistance, and weather resistance. It is also green and environmentally friendly with a long service life.

[0007] Technical Solution: To achieve the above objectives, this utility model provides a high-shield, anti-interference optoelectronic composite high-voltage power cable, comprising a cable core, wherein the cable core is formed by twisting together multiple optoelectronic composite shielded cables; the gaps in the cable core are filled with nano-halogen-free high flame-retardant filler rope; a semi-conductive nylon tape is wrapped around the cable core; a tin-plated copper foil inner shielding layer is wrapped around the semi-conductive nylon tape; a flame-retardant inner sheath is provided outside the tin-plated copper foil inner shielding layer; a semi-conductive buffer water-blocking composite tape is wrapped around the flame-retardant inner sheath; vermiculite flame-retardant cloth is wrapped around the semi-conductive buffer water-blocking composite tape; a steel core composite reinforcement layer is provided outside the vermiculite flame-retardant cloth; a Lyofil® anti-surge sleeve is provided outside the steel core composite reinforcement layer; and a ceramicized low-smoke halogen-free polyolefin fire-resistant outer sheath is extruded outside the Lyofil® anti-surge sleeve.

[0008] Furthermore, the optoelectronic composite shielded cable includes a multimode optical fiber unit and an insulated shielded core, and a TPU flame-retardant outer sheath is extruded over the multimode optical fiber unit and the insulated shielded core.

[0009] Furthermore, the insulated shielded core comprises an aluminum alloy split conductor, and a conductor shielding layer, a grafted modified polypropylene insulation layer, and an insulation shielding layer are sequentially extruded over the aluminum alloy split conductor.

[0010] Furthermore, the flame-retardant inner sheath is made of alkali-free glass fiber or high-expansion glass fiber woven into a tube, and then coated with organic high-temperature resistant iron oxide red silicone and treated at high temperature.

[0011] Furthermore, the conductor shielding layer is a conductor shielding layer made of an ultra-clean, ultra-smooth cross-linked graphene composite high semiconducting inner shielding material with a volume resistivity of less than 20 Ω·cm at 20℃.

[0012] Furthermore, the insulating shielding layer is an insulating shielding layer made of an ultra-clean, ultra-smooth cross-linked graphene composite high semiconducting outer shielding material with a volume resistivity of less than 20 Ω·cm at 20℃.

[0013] Furthermore, the semi-conductive buffer water-blocking composite tape includes a water-blocking tape, a metal wire cloth tape, and a semi-conductive tape. The metal wire cloth tape is attached to one side of the water-blocking tape, and the semi-conductive tape is attached to the other side of the water-blocking tape. The semi-conductive tape includes a graphene fiber layer and a uniformly electrically conductive compound adhesive layer coated on both sides of the graphene fiber layer.

[0014] Furthermore, the vermiculite flame-retardant cloth is composed of fiberglass cloth and vermiculite adhesive layers bonded to both sides of the woven fabric.

[0015] Furthermore, the steel core composite reinforcing layer includes an EPDM rubber layer and a reinforcing steel core disposed within the EPDM rubber layer.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In order to ensure the stability and roundness of the cable structure, nano-halogen-free high flame-retardant filler rope is filled in the gaps of the cable core. It has good resistance to burn-off and can continuously retard the flame to penetrate deep. In the test, the flame retardant level can reach V-0 level.

[0018] 2. The conductor shielding layer is made of an ultra-clean, ultra-smooth cross-linked graphene composite high semi-conductive inner shielding material with a volume resistivity of less than 20 Ω·cm at 20℃; the insulating shielding layer is made of an ultra-clean, ultra-smooth cross-linked graphene composite high semi-conductive outer shielding material with a volume resistivity of less than 20 Ω·cm at 20℃; the inner and outer shielding materials and semi-conductive binding tape used above all use graphene with excellent conductivity as conductive filler, so that the volume resistivity, surface resistance, mechanical properties and thermal stability of these materials are better than existing products, which greatly improves the effect of homogenizing the electric field of the cable, prevents partial discharge, and improves the reliability and life of the cable operation;

[0019] 3. The improved use of grafted modified polypropylene insulation layers gives the cable the following advantages: excellent electrical insulation performance, maintaining stable insulation at high operating temperatures to prevent current leakage and ensure safe operation of wires and cables; good mechanical properties, such as tensile strength, impact resistance, and abrasion resistance, effectively protecting the internal conductors and extending the cable's service life; ability to operate at high temperatures without performance degradation, suitable for wire and cable applications in high-temperature environments, such as medium and high voltage wires and cables; low production energy consumption and recyclability, aligning with green and low-carbon development trends and helping to reduce environmental pollution; and due to its excellent performance and low production cost, grafted modified polypropylene insulation material offers high economic benefits, reducing the manufacturing cost of wires and cables and enhancing the product's market competitiveness.

[0020] 4. The use of cross-linked polyolefin inner sheath gives the cable excellent weather resistance, oil resistance, ozone resistance, and UV resistance, as well as good abrasion resistance, high tear strength, and low compression set.

[0021] 5. The steel core composite reinforcement is surrounded by Lyofil® anti-wave sleeve 9, which is a lightweight three-proof anti-wave sleeve made of PBO fiber combined with metal coating. It can be used for anti-corrosion protection of cables exposed to acidic salt spray for a long time, and also has the advantages of being lightweight and highly tough.

[0022] 6. The flame-retardant inner sheath is made of alkali-free glass fiber or high-expansion glass fiber woven into a tube, and then coated with organic high-temperature resistant iron oxide red silicone and treated at high temperature. It is not damaged by high temperature and flame, and has flame-retardant, anti-static and flexible properties. These properties make it suitable for protecting cables in harsh environments. It can be continuously exposed to a high temperature of 260℃ without damage and can withstand a high temperature of 1000℃. The 1000℃ destructive test can last for half an hour. After half an hour, the outer coating begins to carbonize, and the glass fiber remains intact.

[0023] In summary, through the above improvements, this cable structure has high shielding effectiveness, low dynamic resistance, low loss, effectively prevents interference from external high-frequency signals, has a fast signal transmission rate, and possesses good high-temperature resistance, flame retardancy, fire resistance, water resistance, mechanical properties, corrosion resistance, aging resistance, and weather resistance. It is also environmentally friendly and has a long service life. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the flame-retardant inner sheath of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the semi-conductive buffer water-blocking composite tape of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the vermiculite flame-retardant cloth of this utility model;

[0028] Figure 5 This is a schematic diagram of the steel core composite reinforcement layer of this utility model. Detailed Implementation

[0029] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0030] like Figure 1 As shown, this utility model provides a high-shield anti-interference type optoelectronic composite high-voltage power cable, including a cable core, which is formed by twisting together multiple optoelectronic composite shielded cables 1;

[0031] In this embodiment, the optoelectronic composite shielded cable 1 includes a multimode optical fiber unit 11 and an insulated shielded core 12. A TPU flame-retardant outer sheath 13 is extruded over the multimode optical fiber unit and the insulated shielded core. The outer sheath has excellent load-bearing capacity, impact resistance and shock absorption performance, high tensile strength and large elongation, which greatly improves the mechanical properties of the optoelectronic composite shielded cable. In addition, it also makes the optoelectronic composite shielded cable wear-resistant, oil-resistant and corrosion-resistant.

[0032] In this embodiment, the insulated shielded core includes an aluminum alloy split conductor 121, and a conductor shielding layer 122, a grafted modified polypropylene insulation layer 123, and an insulation shielding layer 124 are sequentially extruded over the aluminum alloy split conductor.

[0033] In this embodiment, to further improve the various performance characteristics of the cable, the conductor shielding layer is made of an ultra-clean, ultra-smooth cross-linked graphene composite high semiconductivity inner shielding material with a volume resistivity below 20 Ω·cm at 20°C; the insulating shielding layer is made of an ultra-clean, ultra-smooth cross-linked graphene composite high semiconductivity outer shielding material with a volume resistivity below 20 Ω·cm at 20°C; the inner and outer shielding materials and semiconducting binding tape used above all use graphene with excellent conductivity as conductive filler, so that the volume resistivity, surface resistance, mechanical properties and thermal stability of these materials are better than existing products, which greatly improves the effect of homogenizing the electric field of the cable, prevents partial discharge, and improves the reliability and life of the cable operation.

[0034] In this embodiment, the improved grafted polypropylene insulation layer gives the cable the following advantages: 1. Excellent electrical insulation performance, maintaining stable insulation at high operating temperatures, preventing current leakage, and ensuring the safe operation of the wires and cables; 2. Good mechanical properties, such as tensile strength, impact resistance, and abrasion resistance, effectively protecting the internal conductors and extending the cable's service life; 3. It can operate at high temperatures without performance degradation, making it suitable for wire and cable applications in high-temperature environments, such as medium and high voltage wires and cables; 4. It features low production energy consumption and recyclability, conforming to the green and low-carbon development trend and helping to reduce environmental pollution; 5. Due to its excellent performance and low production cost, grafted modified polypropylene insulation material has high economic benefits, reducing the manufacturing cost of wires and cables and improving the market competitiveness of the products.

[0035] In this embodiment, the multimode fiber unit comprises a multimode fiber 111, a glass fiber tape 112 wrapped around the multimode fiber, a polytetrafluoroethylene (PTFE) insulation layer 113 extruded around the glass fiber tape, and a loose tube 114 covering the PTFE insulation layer. The glass fiber tape wrapping around the multimode fiber prevents oxidation and gives the entire multimode fiber unit excellent properties such as high temperature resistance, insulation, fire retardancy, corrosion resistance, aging resistance, weather resistance, and high strength. Furthermore, the PTFE insulation layer provides the fiber unit with good electrical insulation, abrasion resistance, water resistance, high temperature resistance, and pulse interference resistance, ensuring the stability of the transmitted signal. Finally, the loose tube protects the fiber from internal stress and external pressure.

[0036] In this embodiment, in order to ensure the stability and roundness of the cable structure, nano-halogen-free high flame-retardant filler rope 2 is filled in the gaps of the cable core. It has good resistance to burn-off and can continuously retard the flame deep into the burning area. The flame retardant level can reach V-0 level in the test.

[0037] A semi-conductive nylon tape 3 is wrapped around the cable core to bind the cable conductor, thereby reducing electromagnetic interference and improving the overall performance of the cable. A tinned copper foil inner shielding layer 4 is wrapped around the semi-conductive nylon tape, which not only improves the shielding performance of the cable but also enhances the bending performance, oxidation resistance, and fatigue resistance of the conductor. A flame-retardant inner sheath 5 is provided outside the tinned copper foil inner shielding layer to ensure the flame-retardant performance of the cable. A semi-conductive buffer water-blocking composite tape 6 is wrapped around the flame-retardant inner sheath to further improve the water-blocking performance of the cable. Vermiculite flame-retardant cloth 7 is wrapped around the semi-conductive buffer water-blocking composite tape. A steel core composite reinforcement layer 8 is provided outside the vermiculite flame-retardant cloth. A Lyofil® anti-surge sleeve 9 is provided outside the steel core composite reinforcement layer. This lightweight, three-proof anti-surge sleeve, which uses PBO fiber combined with a metal coating, can be used for corrosion protection of cables exposed to acidic salt spray for a long time, and is also lightweight and highly tough.

[0038] The Lyofil® wave shield is extruded with a ceramicized low-smoke halogen-free polyolefin fire-resistant outer sheath 10, which can form a hard ceramic shell under high temperature conditions above 650°C. This shell does not melt or drip, can resist water spray and mechanical vibration, and has a very good heat insulation effect, thus achieving the purpose of fire prevention and flame retardancy.

[0039] In this embodiment, as Figure 2As shown, the flame-retardant inner sheath 5 is made of alkali-free glass fiber or high-expansion glass fiber woven into a tube 51, and then coated with organic high-temperature resistant iron oxide red silicone 52 on its outer surface and treated at high temperature. It is not damaged by high temperature and flame, and has flame-retardant, anti-static and flexible properties. These properties make it suitable for protecting cables in harsh environments. It can be continuously exposed to a high temperature of 260℃ without damage and can withstand a high temperature of 1000℃. The 1000℃ destructive test can last for half an hour. After half an hour, the outer coating begins to carbonize, and the glass fiber remains intact.

[0040] In this embodiment, as Figure 3 As shown, the semi-conductive buffer water-blocking composite tape 6 includes a water-blocking tape 61, a metal wire cloth tape 62, and a semi-conductive tape 63. The metal wire cloth tape 62 is attached to one side of the water-blocking tape 61, and the semi-conductive tape 63 is attached to the other side of the water-blocking tape 61. The semi-conductive tape 63 includes a graphene fiber layer 631 and a uniformly electrically conductive compound adhesive layer 632 coated on both sides of the graphene fiber layer. It can inhibit and slow down the growth of water trees and prevent water from spreading longitudinally inside the cable. At the same time, for water that seeps in due to external damage, the water-blocking layer can quickly block the water and prevent it from spreading longitudinally into the cable.

[0041] In addition, the metal wire tape serves two purposes: firstly, it acts as a shield because the voltage inside high-voltage and ultra-high-voltage cables is extremely high, generating a very strong electric field. The shielding layer formed by the metal wire tape can effectively prevent high-voltage and ultra-high-voltage cables from interfering with the outside world; secondly, during normal operation, the metal wire tape can be used as a channel for capacitive current; and thirdly, when a short circuit occurs in the system, the metal wire tape can also serve as a channel for short-circuit current.

[0042] In this embodiment, as Figure 4 As shown, the vermiculite flame-retardant cloth 7 is composed of fiberglass cloth 71 and vermiculite adhesive layers 72 bonded to the front and back of the woven fabric. It has high fire resistance and greatly improves the fire resistance of the cable.

[0043] In this embodiment, as Figure 5 As shown, the steel core composite reinforcing layer 8 includes an EPDM rubber layer 81 and a ring of reinforcing steel core 82 disposed within the EPDM rubber layer. Compared with the original steel tape armor layer, it is lighter and lower in cost, enhances tensile strength, compressive strength and other mechanical protection, and extends the service life of the cable. In addition, EPDM rubber has excellent weather resistance, ozone resistance, heat resistance and acid and alkali resistance, which not only protects the reinforcing steel core from corrosion, but also gives the cable corresponding weather resistance, ozone resistance, heat resistance and acid and alkali resistance.

[0044] In summary, through the above improvements, this cable structure has high shielding effectiveness, low dynamic resistance, low loss, effectively prevents interference from external high-frequency signals, has a fast signal transmission rate, and possesses good high-temperature resistance, flame retardancy, fire resistance, water resistance, mechanical properties, corrosion resistance, aging resistance, and weather resistance. It is also environmentally friendly and has a long service life.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present utility model, and these should also be considered to fall within the protection scope of the present utility model.

Claims

1. A high-voltage power cable of the optical-electrical hybrid type with high shielding against interference, characterized in that: The cable includes a cable core composed of a plurality of optical and electrical composite shielded cables (1); a nano halogen-free high flame-retardant filling rope (2) is filled in the gap of the cable core; a semi-conductive nylon belt (3) is wrapped outside the cable core; a tinned copper foil inner shielding layer (4) is coated outside the semi-conductive nylon belt; a flame-retardant inner sheath (5) is arranged outside the tinned copper foil inner shielding layer; a semi-conductive buffer water-resistant composite belt (6) is overlapped and wrapped outside the flame-retardant inner sheath; a vermiculite flame-retardant cloth (7) is wrapped outside the semi-conductive buffer water-resistant composite belt; a steel core composite reinforcing layer (8) is arranged outside the vermiculite flame-retardant cloth; a Lyofil® anti-wave sheath (9) is arranged outside the steel core composite reinforcing layer; and a ceramicized low-smoke halogen-free polyolefin fire-resistant outer sheath (10) is extruded and wrapped outside the Lyofil® anti-wave sheath.

2. The opto-composite high-voltage power cable of claim 1, wherein: The optical and electrical composite shielded cable (1) comprises a multimode optical fiber unit (11) and an insulated shielded wire core (12), and a TPU flame-retardant outer coating (13) is extruded and wrapped outside the multimode optical fiber unit and the insulated shielded wire core.

3. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 2, wherein: The insulated shielded wire core comprises an aluminum alloy split conductor (121), and a conductor shielding layer (122), a grafted modified polypropylene insulation layer (123) and an insulation shielding layer (124) are extruded and wrapped outside the aluminum alloy split conductor in sequence.

4. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 2, wherein: The multimode optical fiber unit is composed of a multimode optical fiber (111), a glass fiber belt (112) wrapped outside the multimode optical fiber, a polytetrafluoroethylene insulation layer (113) extruded outside the glass fiber belt and a loose sleeve (114) coated outside the polytetrafluoroethylene insulation layer.

5. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 1, wherein: The flame-retardant inner sheath (5) is made of a tube (51) woven by alkali-free glass fiber or high-bulk glass fiber, and an organic high-temperature-resistant red iron oxide silicone glue (52) is coated on the outer surface of the tube (51) and treated at high temperature.

6. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 3, wherein: The conductor shielding layer (122) is made of a conductor shielding layer prepared from an ultra-clean and ultra-smooth cross-linked graphene composite high semi-conductive inner shielding material with a volume resistivity of less than 20 Ω·cm at 20 ℃.

7. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 3, wherein: The insulation shielding layer (124) is made of an insulation shielding layer prepared from an ultra-clean and ultra-smooth cross-linked graphene composite high semi-conductive outer shielding material with a volume resistivity of less than 20 Ω·cm at 20 ℃.

8. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 1, wherein: The semi-conductive buffer water-resistant composite belt (6) comprises a water-resistant belt (61), a metal wire cloth belt (62) and a semi-conductive belt (63), the metal wire cloth belt (62) is attached to one side of the water-resistant belt (61), and the semi-conductive belt (63) is attached to the other side of the water-resistant belt (61); the semi-conductive belt (63) comprises a graphene fiber layer (631) and a uniform electric property semi-conductive compound glue layer (632) coated on both sides of the graphene fiber layer.

9. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 1, wherein: The vermiculite flame-retardant cloth (7) is composed of a glass fiber cloth (71) and vermiculite glue layers (72) adhered to the front and back surfaces of the woven fabric.

10. The highly shielded, RFI-immune, photoconductive, high voltage power cable of claim 1, wherein: The steel core composite reinforcing layer (8) comprises a ternary ethylene-propylene rubber layer (81) and a reinforcing steel core (82) arranged in the ternary ethylene-propylene rubber layer.

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