A large capacity cold-resistant and aging-resistant overhead insulated cable

Abstract

The utility model discloses a kind of high-capacity cold-resistant aging overhead insulated cable, including aluminium-clad steel core heat-resistant aluminium alloy conductor, in the conductor outer overlap wrapping polyarylate fiber band, cover rate is 80%, in the outer extrusion of polyarylate fiber band Insulation layer, form wire core;Wire core is equipped with shielding layer outside, hybrid braided tensile layer is equipped with outside shielding layer, weathering layer is equipped with outside hybrid braided layer, cold-resistant layer is equipped with outside weathering layer, fluorocarbon paint coating layer is equipped with outside cold-resistant layer.This cable has excellent weather resistance and aging resistance, large transmission capacity, solves the problem of large energy consumption, poor weather resistance and aging resistance of existing overhead insulated cable, and long time will cause insulation freezing, damp, ultraviolet radiation and other damage.

Description

Technical Field

[0001] This utility model relates to the field of overhead insulated cables, specifically to a high-capacity, cold-resistant, and aging-resistant overhead insulated cable. Background Technology

[0002] Overhead insulated cables are overhead conductors equipped with insulation layers and protective sheaths. They are specialized cables manufactured using a process similar to that of cross-linked cables, representing a new power transmission method between overhead conductors and underground cables. Most overhead insulated cables are single-core, and based on their structure, they can be classified into hard aluminum wire structure, hard-drawn copper wire structure, aluminum alloy wire structure, steel core or aluminum alloy core supported structure, and self-supporting three-core composite structure (the core can be hard aluminum or hard copper wire), etc. They are characterized by high power supply reliability, good power supply safety, convenient installation and maintenance, and reasonable economic efficiency. Their main technical parameters include weather resistance, insulation level, inner and outer semi-conductive shielding layers. Overhead cables are widely used in power transmission both domestically and internationally.

[0003] With the widespread application of overhead insulated cables, the quality requirements for these cables are constantly increasing. Overhead insulated cables are generally used for power transmission in urban, rural, and mountainous areas. However, existing cables have relatively poor strength and toughness, and low tensile strength, making them prone to breakage when spanning large distances, such as across rivers, windy areas, or at high altitudes. This can easily lead to accidents and economic losses. Furthermore, overhead insulated cables need to be laid for extended periods in harsh weather conditions such as sunlight, rain, and snow. The cables themselves consume a lot of energy and have poor weather resistance and aging resistance; over time, this can cause damage to the insulation, such as freezing, moisture, and ultraviolet radiation. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a high-capacity, cold-resistant, and aging-resistant overhead insulated cable, which has excellent weather resistance and aging resistance, and large transmission capacity. It solves the problems of high energy consumption, poor weather resistance and aging resistance, and damage to insulation caused by freezing, dampness, and ultraviolet radiation caused by long-term use of existing overhead insulated cables.

[0005] To achieve the above objectives, this utility model provides a high-capacity, cold-resistant, and aging-resistant overhead insulated cable, comprising an aluminum-clad Invar core heat-resistant aluminum alloy conductor, with polyaramid fiber tape wrapped around the conductor in an overlap ratio of 80%, and an insulation layer extruded over the polyaramid fiber tape to form the conductor core; a shielding layer is provided outside the conductor core, a mixed braided tensile layer is provided outside the shielding layer, a weather-resistant layer is provided outside the mixed braided layer, a cold-resistant layer is provided outside the weather-resistant layer, and a fluorocarbon paint coating layer is provided outside the cold-resistant layer.

[0006] Furthermore, the aluminum-clad Invar core heat-resistant aluminum alloy conductor is made of ultra-heat-resistant aluminum alloy wire twisted together with an aluminum-clad Invar core.

[0007] Furthermore, the insulating layer is formed by extrusion of POE insulating material.

[0008] Furthermore, the hybrid woven tensile layer is made of a mixture of polyvinyl alcohol fibers and polyacrylonitrile fibers.

[0009] Furthermore, the weather-resistant layer comprises, from the inside out, a polyimide film, a silicone sealant, and a polytetrafluoroethylene film, wherein the polyimide film and the polytetrafluoroethylene film are bonded together by the silicone sealant.

[0010] Furthermore, the cold-resistant layer is composed of an aerogel pad and a nitrile rubber layer.

[0011] Furthermore, the aerogel pad is coated on the outer surface of a polytetrafluoroethylene film.

[0012] Furthermore, the nitrile rubber layer is extruded onto the outer surface of the aerogel pad.

[0013] Furthermore, the shielding layer includes a polyimide film and an aluminum foil layer, wherein the aluminum foil layer is glued to both sides of the polyimide film.

[0014] Furthermore, the aluminum foil layer has a discontinuous structure, on which grooves are etched to divide the aluminum foil layer into several aluminum foil shielding units, and the width of the grooves is 2-4 mm.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The cable conductor adopts an aluminum-clad Invar core heat-resistant aluminum alloy conductor. This conductor is made of ultra-heat resistant aluminum alloy wire stranded with an aluminum-clad Invar core. The long-term operating temperature reaches 210℃, the short-term heat resistance is 240℃, the current carrying capacity is more than twice that of conventional conductors, and the sag characteristics are the same as those of steel-cored aluminum stranded wire. The transmission capacity can be doubled without modifying the iron tower.

[0016] 2. The cable conductor is wrapped with polyaramid fiber tape, which maintains good mechanical properties even in extreme low-temperature environments. Compared with traditional fibers, it has a higher elastic modulus and a lower brittleness point. This ensures the integrity and flexibility of the fiber structure even in environments with temperatures tens of degrees below zero Celsius, making the cable more reliable and durable for use in cold or high-altitude regions.

[0017] 3. The cable insulation layer is made of POE insulation cable material extrusion, which has outstanding aging resistance; it has good resistance to environmental factors such as ultraviolet rays, heat and oxygen, and its performance degradation is relatively small after long-term exposure in natural environment.

[0018] 4. The outer layer of the cable insulation is provided with a mixed braided layer of polyvinyl alcohol fiber and polyacrylonitrile fiber. Polyvinyl alcohol fiber has high strength, high modulus, low elongation, wear resistance, acid and alkali resistance and good weather resistance; polyacrylonitrile fiber also has good wear resistance and fatigue resistance, as well as excellent weather resistance and acid and alkali resistance, which greatly increases the strength and weather resistance of the cable.

[0019] 5. The cable braided layer is surrounded by a weather-resistant layer. The inner polyimide film has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and media resistance, and can be used for a long time in a temperature range of -269℃ to 280℃. The outer polytetrafluoroethylene film has high and low temperature resistance (-196℃ to 300℃), chemical corrosion resistance, high lubricity, electrical insulation, and non-adhesion. The silicone weather-resistant adhesive has strong adhesion and high tensile strength, and also has weather resistance, vibration resistance, moisture resistance, odor resistance, and adaptability to large temperature changes.

[0020] 6. The cable composite wrapping layer is equipped with a cold-resistant layer, which is formed by covering the outside of the cable with an aerogel pad and a nitrile rubber layer. The aerogel pad has very low thermal conductivity and excellent thermal insulation performance, which can improve the internal thermal insulation performance of the cable body, thereby achieving the purpose of thermal insulation and cold resistance of the cable body. The nitrile rubber layer can improve the impact resistance of the cable body and protect the inside of the cable from external impacts that may cause deformation of the internal cable and affect its normal use.

[0021] 7. The cable is coated with a fluorocarbon paint layer, which contains a large number of FC bonds in its resin. Under the action of heat and light (including ultraviolet light), the FC bonds are difficult to break, thus exhibiting excellent weather resistance, aging resistance and chemical corrosion resistance. This allows it to maintain stable performance in a variety of environments and is not easily affected by external factors, thereby increasing the reliability and service life of the cable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the shielding layer of this utility model; Figure 3 This is a schematic diagram of the weather-resistant layer of this utility model. Detailed Implementation

[0023] 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.

[0024] like Figure 1-2As shown, this utility model provides a high-capacity, cold-resistant, and aging-resistant overhead insulated cable, comprising an aluminum-clad Invar core heat-resistant aluminum alloy conductor 1, with a polyaramid fiber tape 2 overlapping and wrapped around the conductor, the overlap rate being 80%. It maintains good mechanical properties even in extreme low-temperature environments; compared to traditional fibers, it has a higher elastic modulus and a lower brittleness point; that is, even in environments with temperatures tens of degrees below zero Celsius, it can ensure the integrity and flexibility of the fiber structure, making the cable more reliable and durable for use in cold or high-altitude regions; an insulation layer 3 is extruded over the polyaramid fiber tape to form the core. The cable has a shielding layer 4 outside the core, a mixed braided tensile layer 5 outside the shielding layer, a weather-resistant layer 6 outside the mixed braided tensile layer, a cold-resistant layer 7 outside the weather-resistant layer, and a fluorocarbon paint coating layer 8 outside the cold-resistant layer. The fluorocarbon paint coating contains a large number of FC bonds in its resin. Under the action of heat and light (including ultraviolet rays), the FC bonds are difficult to break. Therefore, the cable has ultra-long weather resistance, aging resistance and chemical corrosion resistance, which enables the cable to maintain stable performance in a variety of environments and is not easily affected by external factors, thereby increasing the reliability and service life of the cable.

[0025] In this embodiment, the aluminum-clad Invar core heat-resistant aluminum alloy conductor 1 is made of ultra-heat resistant aluminum alloy wire stranded with an aluminum-clad Invar core. It has a long-term operating temperature of 210°C, a short-term heat resistance of 240°C, and a current carrying capacity more than twice that of conventional conductors. Its sag characteristics are the same as those of steel-cored aluminum stranded wire, and the transmission capacity can be doubled without modifying the iron tower.

[0026] In this embodiment, as Figure 2 As shown, the shielding layer 4 includes a polyimide film 41 and an aluminum foil layer 42. The aluminum foil layer is glued to both sides of the polyimide film. The aluminum foil layer has a discontinuous structure with grooves 43 etched on it to divide the aluminum foil layer into several aluminum foil shielding units. The width of the grooves is 2-4 mm. This significantly reduces the static electricity accumulation on each aluminum foil shielding unit, eliminating the need for drainage, thereby reducing investment costs. The structure is simple and easy to implement.

[0027] In this embodiment, the mixed braided tensile layer 5 is made of polyvinyl alcohol fiber and polyacrylonitrile fiber. Polyvinyl alcohol fiber has high strength, high modulus, low elongation, wear resistance, acid and alkali resistance, and good weather resistance. Polyacrylonitrile fiber has good wear resistance and fatigue resistance, as well as excellent weather resistance and acid and alkali resistance. The composite structure greatly increases the cable strength and weather resistance.

[0028] In this embodiment, as Figure 3As shown, the weather-resistant layer 6 comprises, from the inside out, a polyimide film 61, a silicone sealant 62, and a polytetrafluoroethylene film 63. The polyimide film and the polytetrafluoroethylene film are bonded together by the silicone sealant. The inner polyimide film has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and media resistance, and can be used for a long time in a temperature range of -269℃ to 280℃. The outer polytetrafluoroethylene film has high and low temperature resistance (-196℃ to 300℃), chemical corrosion resistance, high lubricity, electrical insulation, and non-adhesive properties. The silicone weather-resistant sealant has strong adhesion and high tensile strength, and also has weather resistance, vibration resistance, moisture resistance, odor resistance, and adaptability to large temperature changes.

[0029] In this embodiment, the cold-resistant layer 7 is composed of an aerogel pad 71 and a nitrile rubber layer 72. The aerogel pad is wrapped on the outer surface of the polytetrafluoroethylene film and has very low thermal conductivity and excellent heat insulation performance, which can improve the heat insulation performance inside the cable body, thereby achieving the purpose of heat insulation and cold resistance for the cable body. The nitrile rubber layer is extruded on the outer surface of the aerogel pad, which can improve the impact resistance of the cable body and protect the inside of the cable from the impact of external factors, thereby preventing deformation of the internal cable and affecting its normal use.

[0030] In summary, through the above design, the cable of this utility model possesses excellent weather resistance and aging resistance, as well as a large transmission capacity. It solves the problems of high energy consumption, poor weather resistance and aging resistance of existing overhead insulated cables, and damage to the insulation from freezing, dampness, and ultraviolet radiation over time. This allows the overhead insulated cable to meet the requirements of long-term laying in harsh weather environments such as sunlight, rain, and snow, thereby increasing the reliability and service life of the cable.

[0031] There are many specific applications of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this utility model, and these improvements should also be considered within the protection scope of this utility model.

Claims

1. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable, characterized in that: The conductor consists of an aluminum-clad Invar core heat-resistant aluminum alloy conductor, with polyaramid fiber tape wrapped around the conductor at an overlap rate of 80%, and an insulation layer extruded over the polyaramid fiber tape to form the wire core. A shielding layer is provided outside the wire core, a mixed braided tensile layer is provided outside the shielding layer, a weather-resistant layer is provided outside the mixed braided layer, a cold-resistant layer is provided outside the weather-resistant layer, and a fluorocarbon paint coating layer is provided outside the cold-resistant layer.

2. The high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 1, characterized in that: The aforementioned aluminum-clad Invar core heat-resistant aluminum alloy conductor is made of ultra-heat-resistant aluminum alloy wire twisted together with an aluminum-clad Invar core.

3. The high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 1, characterized in that: The insulation layer is formed by extrusion of POE insulating material.

4. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 1, characterized in that: The hybrid woven tensile layer is made of a mixture of polyvinyl alcohol fiber and polyacrylonitrile fiber.

5. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 1, characterized in that: The weather-resistant layer comprises, from the inside out, a polyimide film, a silicone sealant, and a polytetrafluoroethylene film, wherein the polyimide film and the polytetrafluoroethylene film are bonded together by the silicone sealant.

6. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 5, characterized in that: The cold-resistant layer is composed of an aerogel pad and a nitrile rubber layer.

7. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 6, characterized in that: The aerogel pad is coated on the outer surface of a polytetrafluoroethylene film.

8. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 7, characterized in that: The nitrile rubber layer is extruded onto the outer surface of the aerogel pad.

9. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 1, characterized in that: The shielding layer includes a polyimide film and an aluminum foil layer, with the aluminum foil layer glued to both sides of the polyimide film.

10. A high-capacity, cold-resistant, and aging-resistant overhead insulated cable according to claim 9, characterized in that: The aluminum foil layer has a discontinuous structure, with grooves etched on it to divide the aluminum foil layer into several aluminum foil shielding units. The width of the grooves is 2-4 mm.

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