Carbon fiber reinforced conductor for long span power transmission

Abstract

The utility model relates to the technical field of transmission line provides a kind of carbon fiber capacity-increasing conductor for large-span power transmission, including carbon fiber core group and by inside and outside sequentially arranged in the outside of carbon fiber core group inner support wire group, inner conductive layer, outer support wire group and outer conductive layer. According to the carbon fiber capacity-increasing conductor for large-span power transmission of the utility model, the increase of sag can be inhibited under operating temperature and mechanical load, the safety distance of line to ground is improved, the long-term allowable current-carrying capacity is significantly improved, the electromagnetic field distribution of conductor is optimized, the power loss and electromagnetic environmental pollution generated therefore are reduced, the uniformity of current conduction and excellent heat dissipation performance are guaranteed, the internal stress of conductor is effectively balanced, prevent loose, the mechanical tightness and torsional stability of conductor are improved, ensure its safety and reliability in long-term large-span erection operation.

Description

Technical Field

[0001] This utility model relates to the field of power transmission line technology, and in particular to a carbon fiber capacity-enhancing conductor for long-span power transmission. Background Technology

[0002] In the field of high-voltage power transmission, long-span transmission lines are used to cross vast terrains such as rivers, valleys, and straits, placing extremely high demands on the mechanical strength, weight, and electrical performance of the conductors. Traditional long-span transmission conductors use steel-cored aluminum stranded wire (ACSR), where the steel core bears the mechanical load and the aluminum strands conduct electricity. However, this structure has significant drawbacks: First, the high density of the steel core results in a high overall conductor weight, causing significant sag, limiting the span, and requiring more robust towers, increasing construction costs. Second, the poor conductivity of the steel core means the conductor's current capacity mainly depends on the cross-sectional area of ​​the aluminum strands. When capacity increases are needed, the cross-sectional area of ​​the aluminum strands is usually increased, but this further increases weight, creating a vicious cycle. Furthermore, poor heat dissipation can easily lead to overheating, reducing transmission efficiency and even causing safety accidents. In addition, long-span transmission lines often operate in high-voltage environments, where corona discharge is a prominent problem, leading to energy loss, electromagnetic interference, and audible noise. Traditional conductors suppress corona by increasing diameter or using split conductors, but this increases weight and wind load, reducing the conductor's resistance to wind vibration and affecting long-term operational safety. In terms of conductor safety, traditional steel-cored aluminum stranded wire is susceptible to fatigue, corrosion and environmental factors, especially under harsh weather conditions, resulting in a shorter lifespan and higher maintenance costs.

[0003] To overcome the aforementioned problems, carbon fiber composite materials have been introduced into conductor design, improving mechanical properties with their high specific strength, lightweight, and corrosion resistance. However, existing carbon fiber conductors still have shortcomings: the bonding between the carbon fiber core and the conductive layer is often imperfect, leading to uneven current distribution and low heat dissipation efficiency, which limits the potential for capacity expansion; in terms of corona control, a single conductive layer structure is difficult to effectively suppress corona discharge under high voltage; at the same time, the conductor structure lacks stability and is prone to interlayer loosening or damage under dynamic loads such as wind vibration and ice load, threatening power transmission safety.

[0004] Chinese patent CN110491592B discloses an energy-saving and capacity-enhancing conductor for power transmission lines and its preparation method. By optimizing the resin matrix formula of the carbon fiber core to toughen and improve the thermal stability of the epoxy resin, the mechanical properties and high-temperature resistance of the carbon fiber composite core are improved. However, no structural improvements are made, so the corona performance of the conductor cannot be improved, making it unsuitable for applications in long-span scenarios.

[0005] Therefore, there is an urgent need in this field for an innovative conductor structure that can achieve efficient capacity expansion, excellent corona control, and higher safety in long-span power transmission, so as to meet the requirements of modern power systems for high capacity, high reliability, and long life. Utility Model Content

[0006] In view of this, in order to overcome the shortcomings of the prior art, the present invention aims to provide a carbon fiber capacity-enhancing conductor for long-span power transmission.

[0007] This utility model provides a carbon fiber capacity-enhancing conductor for long-span power transmission. The carbon fiber capacity-enhancing conductor for long-span power transmission includes a carbon fiber core assembly and, from the inside out, an inner support wire assembly, an inner conductive layer, an outer support wire assembly, and an outer conductive layer arranged sequentially on the outside of the carbon fiber core assembly.

[0008] Optionally, the carbon fiber capacity-enhancing conductor for long-span power transmission of this invention includes a carbon fiber core assembly comprising a central carbon fiber core and multiple reinforcing carbon fiber cores spirally twisted around the central carbon fiber core.

[0009] Optionally, the carbon fiber capacity-enhancing conductor for long-span power transmission of this invention has the same structure for the central carbon fiber core and the reinforcing carbon fiber core, with the interior being a carbon fiber resin mixture bundle and the exterior of the carbon fiber resin mixture bundle being an aluminum cladding layer.

[0010] Optionally, the carbon fiber capacity-enhancing conductor for long-span power transmission of this utility model has an inner support wire group composed of 6 inner support aluminum wires with circular cross-sections, which are spirally twisted together at equal intervals around the outside of the carbon fiber core group.

[0011] Optionally, the carbon fiber capacity-enhancing conductor for long-span power transmission of this utility model has an inner conductive layer composed of multiple inner conductive aluminum wires with a fan-shaped cross-section. The multiple inner conductive aluminum wires are spirally twisted and arranged on the outside of the inner support wire group, forming a closed hollow cylindrical inner conductive layer.

[0012] Optionally, the carbon fiber capacity-enhancing conductor for long-span power transmission of this utility model has an outer support wire group composed of 6 outer support aluminum wires, which are spirally twisted together at equal intervals around the outer side of the inner conductive layer.

[0013] Optionally, in the carbon fiber capacity-enhancing conductor for long-span power transmission of this invention, the inner supporting aluminum wire and the outer supporting aluminum wire have the same diameter.

[0014] Optionally, in the carbon fiber capacity-enhancing conductor for long-span power transmission of this invention, the inner supporting aluminum wire and the outer supporting aluminum wire have equal helical twisting angles and helical twisting pitches.

[0015] Optionally, the carbon fiber capacity-enhancing conductor for long-span power transmission of this utility model has an outer conductive layer composed of multiple outer conductive aluminum wires with a fan-shaped cross-section. The multiple outer conductive aluminum wires are spirally twisted and arranged on the outside of the outer support wire group, forming a closed hollow cylindrical outer conductive layer.

[0016] Optionally, in the carbon fiber capacity-enhancing conductor for long-span power transmission of this utility model, the carbon fiber core assembly and the inner conductive layer are spirally twisted in the same direction, and the inner support wire assembly, the outer support wire assembly and the outer conductive layer are spirally twisted in the same direction.

[0017] The carbon fiber capacity-enhancing conductor for long-span power transmission of this invention has the following beneficial technical effects: 1. It can suppress the increase of sag under operating temperature and mechanical load, improve the safe distance between the line and the ground, allow for longer crossing distances at the same tower height, and enable the conductor to operate safely at higher operating temperatures, thereby significantly improving its long-term allowable current carrying capacity.

[0018] 2. To ensure the overall structural stability and resistance to wind vibration and creep of the conductor, the overall diameter of the conductor is effectively increased. Without increasing weight and cost, the electromagnetic field distribution of the conductor is optimized, and the working electric field intensity on the surface of the conductor is significantly reduced, thereby achieving excellent low corona effect and reducing the resulting power loss and electromagnetic environmental pollution.

[0019] 3. Through comprehensive structural design and coordinated operation, the uniformity of current conduction and excellent heat dissipation performance can be guaranteed, the internal stress of the conductor can be effectively balanced, loosening can be prevented, the mechanical tightness and torsional stability of the conductor can be improved, and its safety and reliability can be guaranteed during long-term, long-span erection and operation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional schematic diagram of a carbon fiber capacity-enhancing conductor for long-span power transmission according to an exemplary embodiment of the present invention; Figure 2 This is a schematic diagram of a carbon fiber capacity-enhancing conductor for long-span power transmission according to an exemplary embodiment of the present invention.

[0022] In the diagram, 1-carbon fiber core assembly, 2-inner support wire assembly, 3-inner conductive layer, 4-outer support wire assembly, 5-outer conductive layer, 11-central carbon fiber core, 12-reinforced carbon fiber core, 21-inner support aluminum wire, 31-inner conductive aluminum wire, 41-outer support aluminum wire, 51-outer conductive aluminum wire. Detailed Implementation

[0023] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other; and, based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0025] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0026] Figure 1 This is a cross-sectional schematic diagram of a carbon fiber capacity-enhancing conductor for long-span power transmission according to an exemplary embodiment of the present invention. Figure 2 This is a schematic diagram of a carbon fiber capacity-enhancing conductor for long-span power transmission according to an exemplary embodiment of the present invention. Figure 1 and Figure 2 As shown, in this embodiment, the carbon fiber capacity-enhancing conductor used for long-span power transmission includes a carbon fiber core assembly 1 and, from the inside out, an inner support wire assembly 2, an inner conductive layer 3, an outer support wire assembly 4, and an outer conductive layer 5 arranged sequentially on the outside of the carbon fiber core assembly 1.

[0027] like Figures 1 to 2 As shown, in this embodiment, the carbon fiber core assembly 1 includes a central carbon fiber core 11 and multiple reinforcing carbon fiber cores 12 spirally twisted around the central carbon fiber core 11. In this embodiment, the central carbon fiber core 11 and the reinforcing carbon fiber cores 12 have the same structure, with a carbon fiber resin mixture bundle inside and an aluminum cladding layer on the outside. In this embodiment, the outer diameter of the central carbon fiber core 11 is equal to or equal to the outer diameter of the reinforcing carbon fiber cores 12. In practical applications, the outer diameter of the central carbon fiber core 11 can be increased to improve the load-bearing capacity of the carbon fiber core assembly 1.

[0028] In practical applications, the carbon fiber core assembly 1 possesses excellent tensile strength and an extremely low coefficient of linear expansion. When the conductor is heated (e.g., by Joule heating from high current) or when the ambient temperature changes, its thermal elongation is far less than that of a traditional steel core. This inherent dimensional stability allows the conductor to minimize sag under operating temperature and mechanical loads. Lower operating sag not only increases the safe distance between the line and ground, allowing for longer spans at the same tower height, but also, due to the enhanced sag control, enables the conductor to operate safely at higher operating temperatures, thus significantly increasing its long-term allowable current carrying capacity.

[0029] In this embodiment, the inner support wire group 2 consists of six inner support aluminum wires 21 with circular cross-sections, which are spirally twisted together at equal intervals around the outer side of the carbon fiber core group 1. The inner conductive layer 3 consists of multiple inner conductive aluminum wires 31 with fan-shaped cross-sections, which are spirally twisted together on the outer side of the inner support wire group 2, forming a closed hollow cylindrical inner conductive layer 3. The outer support wire group 4 consists of six outer support aluminum wires 41, which are spirally twisted together at equal intervals around the outer side of the inner conductive layer 3. The outer conductive layer 5 consists of multiple outer conductive aluminum wires 51 with fan-shaped cross-sections, which are spirally twisted together on the outer side of the outer support wire group 4, forming a closed hollow cylindrical outer conductive layer 5.

[0030] In power transmission lines, corona generation is closely related to the electric field strength on the conductor surface. Increasing the conductor diameter is an effective means to reduce the surface electric field strength and thus suppress corona. In this embodiment, an inner support wire group 2 and an outer support wire group 4, composed of six circular aluminum wires, are sequentially arranged outside the carbon fiber core group 1. This not only provides a stable support framework for the inner conductive layer 3 and the outer conductive layer 5, ensuring the overall structural stability of the conductor and its resistance to wind vibration and creep, but also effectively increases the overall diameter of the conductor. Without increasing weight or cost, this optimizes the electromagnetic field distribution of the conductor, significantly reduces the working electric field strength on the conductor surface, and thus achieves an excellent low corona effect, reducing the resulting energy loss and electromagnetic environmental pollution.

[0031] In this embodiment, the carbon fiber core assembly 1 and the inner conductive layer 3 are spirally twisted in the same direction, and the inner support wire assembly 2, the outer support wire assembly 4, and the outer conductive layer 5 are spirally twisted in the same direction. For example, in practical applications, the reinforcing carbon fiber core 12 is spirally twisted counterclockwise around the central carbon fiber core 11 to form the carbon fiber core assembly 1. Six inner support aluminum wires 21 are spirally twisted clockwise at equal intervals around the outer side of the carbon fiber core assembly 1 to form the inner support wire assembly 2. Multiple inner conductive aluminum wires 31 are spirally twisted counterclockwise around the outer side of the inner support wire assembly 2 to form the inner conductive layer 3. Six outer support aluminum wires 41 are spirally twisted clockwise at equal intervals around the outer side of the inner conductive layer 3 to form the outer support wire assembly 4. Multiple outer conductive aluminum wires 51 are spirally twisted clockwise around the outer side of the outer support wire assembly 4 to form the outer conductive layer 5. It should be noted that in this embodiment, the inner support aluminum wires 31 and the outer support aluminum wires 41 have the same diameter. The inner support aluminum wire 31 and the outer support aluminum wire 41 have equal spiral twisting angles and spiral twisting pitches.

[0032] Through the comprehensive structural design and coordinated operation of the carbon fiber core group 1, inner support wire group 2, inner conductive layer 3, outer support wire group 4 and outer conductive layer 5, the uniformity of current conduction and excellent heat dissipation performance can be guaranteed, the internal stress of the conductor can be effectively balanced, loosening can be prevented, the mechanical tightness and torsional stability of the conductor can be improved, and its safety and reliability in long-term, long-span erection and operation can be guaranteed.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A carbon fiber capacity-enhancing conductor for long-span power transmission, characterized in that, The carbon fiber capacity-enhancing conductor for long-span power transmission includes a carbon fiber core assembly and, from the inside out, an inner support wire assembly, an inner conductive layer, an outer support wire assembly, and an outer conductive layer arranged sequentially outside the carbon fiber core assembly. The carbon fiber core assembly includes a central carbon fiber core and multiple reinforcing carbon fiber cores spirally twisted around the central carbon fiber core. The central carbon fiber core and the reinforcing carbon fiber cores have the same structure, with a carbon fiber resin mixture bundle inside and an aluminum cladding layer outside. The inner support wire assembly consists of six inner support aluminum wires with circular cross-sections, spirally twisted at equal intervals around the carbon fiber core assembly. The inner conductive layer consists of multiple inner conductive aluminum wires with fan-shaped cross-sections, spirally twisted around the inner support wire assembly, forming a closed, hollow cylindrical inner conductive layer. The outer support wire assembly consists of six outer support aluminum wires, spirally twisted at equal intervals around the inner conductive layer.

2. The carbon fiber capacity-enhancing conductor for long-span power transmission according to claim 1, characterized in that, The inner support aluminum wire and the outer support aluminum wire have the same diameter.

3. The carbon fiber capacity-enhancing conductor for long-span power transmission according to claim 2, characterized in that, The inner support aluminum wire and the outer support aluminum wire have the same spiral twist angle and spiral twist pitch.

4. The carbon fiber capacity-enhancing conductor for long-span power transmission according to claim 1, characterized in that, The outer conductive layer consists of multiple external conductive aluminum wires with a fan-shaped cross-section. These multiple external conductive aluminum wires are spirally twisted together and set on the outside of the outer support wire group, forming a closed hollow cylindrical outer conductive layer.

5. The carbon fiber capacity-enhancing conductor for long-span power transmission according to claim 1, characterized in that, The carbon fiber core assembly and the inner conductive layer are spirally twisted in the same direction, and the inner support wire assembly, the outer support wire assembly, and the outer conductive layer are spirally twisted in the same direction.

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