Carbon fiber core optical fiber composite ground wire

Abstract

The application provides a carbon fiber core optical fiber composite ground wire, which comprises an optical unit, a protective shell and a carbon fiber assembly; the protective shell comprises a plurality of aluminum wires, the plurality of aluminum wires are concentrically stranded and arranged around the outer periphery of the optical unit; the carbon fiber assembly comprises a plurality of carbon fiber composite rods, the plurality of carbon fiber composite rods are respectively arranged between the optical unit and the plurality of aluminum wires and concentrically stranded around the outer periphery of the optical unit, and the plurality of carbon fiber composite rods and the plurality of aluminum wires are concentrically stranded respectively. The carbon fiber core optical fiber composite ground wire provided by the application has the following advantages: the concentric stranding structure can make the carbon fiber composite rods uniformly transmit tension and avoid local stress concentration, meanwhile, the carbon fiber core optical fiber composite ground wire forms a stable three-layer structure with the optical unit and the aluminum wires, and the mechanical stability of the whole is improved; the aluminum wires form a continuous conductive path through concentric stranding, the contact resistance is small, the circulating current loss can be reduced, and the service life of the overhead ground wire can be greatly prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power cables, and particularly relates to a carbon fiber core optical fiber composite ground wire. BACKGROUND

[0002] The conductor plays a role in transmitting electric energy in an overhead transmission line. The overhead ground wire is a protective ground wire and an optical fiber communication line in a high-voltage transmission line, is erected at the top of a tower, and is located above the conductor, so as to prevent lightning from directly striking the conductor and avoid the harm of lightning to the power system.

[0003] With the increase of functions of the smart grid and the integration of mobile communication and the Internet of Things, the number of optical fibers of the transmission line is increased, so that the overall weight of the overhead ground wire is increased, causing the sag of the overhead ground wire to be increased. On the one hand, the vertical spacing between the overhead ground wire and the conductor is reduced, and the spacing between the overhead ground wire and the conductor is further reduced when the overhead ground wire dances in the wind or is covered with ice and snow, so that flashover and partial discharge between the conductor and the ground wire are prone to occur, causing a safety hazard and affecting the safe operation of the line. On the other hand, the overhead ground wire is located in the alternating magnetic field of the conductor, so that eddy current and circular current are induced, the useless loss of the line is increased, the power transmission efficiency of the conductor is reduced, the eddy current heating accelerates the metal fatigue of the ground wire, and the service life of the overhead ground wire is affected. SUMMARY

[0004] The embodiment of the application provides a carbon fiber core optical fiber composite ground wire, and aims to solve the technical problems that the overall weight of the overhead ground wire is increased in the prior art, the spacing between the overhead ground wire and the conductor is reduced, flashover and partial discharge are caused, and additional loss affects the power transmission efficiency.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows:

[0006] The application provides a carbon fiber core optical fiber composite ground wire, which comprises:

[0007] an optical unit;

[0008] a protective shell comprising a plurality of aluminum wires, the plurality of aluminum wires are concentrically stranded and arranged around the outer periphery of the optical unit, and adjacent two aluminum wires are in contact with each other; and

[0009] a carbon fiber assembly comprising a plurality of carbon fiber composite rods, the plurality of carbon fiber composite rods are respectively located between the optical unit and the plurality of aluminum wires, and are respectively concentrically stranded on the outer periphery of the optical unit, and the stranding directions of the plurality of carbon fiber composite rods and the plurality of aluminum wires are opposite, and adjacent two carbon fiber composite rods are in contact with each other.

[0010] In a possible implementation, the optical unit comprises a shell and optical communication components, the shell is a cylindrical structure, the optical communication components are located inside the shell, and the outer circumferential surface of the shell is attached to the plurality of carbon fiber composite rods respectively.

[0011] In a possible implementation, the shell is provided with a heat insulation buffer grease, and the plurality of optical communication components are in contact with the heat insulation buffer grease respectively.

[0012] In a possible implementation, the shell is a stainless steel belt wound into a cylindrical structure.

[0013] In a possible implementation, the carbon fiber composite rod is a round rod, the center lines of the plurality of carbon fiber composite rods are parallel to each other, and the plurality of carbon fiber composite rods are concentrically stranded in the optical unit.

[0014] In a possible implementation, the carbon fiber composite rod comprises a core and an isolation shell, the core is installed inside the isolation shell, the isolation shell is made of metal, and the contact area of the isolation shell with the optical unit is smaller than the contact area of the isolation shell with the aluminum profile.

[0015] In a possible implementation, the optical communication component comprises a plurality of optical fibers, the plurality of optical fibers are parallel to each other, and the number of the optical fibers is even.

[0016] In a possible implementation, the aluminum profile comprises an aluminum shell and a steel core, the steel core is located inside the aluminum shell, and adjacent aluminum shells abut each other.

[0017] In a possible implementation, the carbon fiber composite rod has a self-checking optical fiber inside.

[0018] In a possible implementation, the cross section of the aluminum profile is in the shape of a tile, and the center of the outer circumference of the aluminum profile and the center of the inner circumference of the aluminum profile respectively fall on the central axis of the optical unit.

[0019] Compared with the prior art, the carbon fiber core optical fiber composite ground wire provided by the application has an optical unit as a core carrier for optical fiber communication, which is specially used for accommodating multiple optical fibers required by a smart grid, and multiple aluminum wires are concentrically stranded to form a protective shell, which can be used as a conductive path of the ground wire to assist in shunting lightning current, and can form a compact mechanical protection structure through concentric stranding to isolate the impact of external weather factors on the internal optical unit and the carbon fiber assembly; the density of the carbon fiber composite rod is only 1 / 4 of that of steel, and the carbon fiber composite rod is high-strength and light-weight, and is arranged between the optical unit and the aluminum wire and is concentrically stranded, so that the carbon fiber composite rod can replace the traditional steel core to bear the main tension of the ground wire without replacing the tower, the overall weight is reduced, the tower remains unchanged, and the tension of the wire remains unchanged, so that the sag of the ground wire can be greatly reduced; the concentric stranding structure can uniformly transmit the tension of the carbon fiber composite rod, avoid local stress concentration, and form a stable three-layer structure with the optical unit and the aluminum wire to improve the overall mechanical stability; the carbon fiber composite rod is a non-metallic material and has no magnetism, so it will not generate strong eddy current in an alternating magnetic field like the traditional steel core, thereby reducing eddy current loss from the source; the aluminum wire forms a continuous conductive path through concentric stranding, has small contact resistance, and can reduce circulating loss; the reduction of eddy current heating can avoid accelerated aging of the aluminum wire and the carbon fiber assembly due to high temperature, and the carbon fiber composite rod can also block the harmful effects of heating of the outer aluminum wire on the optical unit, thereby greatly extending the service life of the overhead ground wire. The concentric stranding structure of the aluminum wire and the carbon fiber composite rod makes the layers of the ground wire closely fit without obvious gaps, which can reduce wind resistance and wind swing in strong wind weather, avoid fluctuations in the distance between the ground wire and the conductor, uniformly disperse ice load, prevent ground wire breakage caused by local overload, and is especially suitable for ice and snow weather, thereby further alleviating the impact of icing on the distance. In addition, the aluminum wire can be made of corrosion-resistant aluminum alloy, and the carbon fiber itself is resistant to acid and alkali corrosion, so that the ground wire is suitable for harsh environments such as coastal areas and industrial pollution areas, and large-span lines, thereby improving the overall environmental adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Figure 1 A sectional view of the carbon fiber core optical fiber composite ground wire provided by an embodiment of the present application;

[0022] Figure 2 A sectional view of the carbon fiber core optical fiber composite ground wire provided by another embodiment of the present application;

[0023] Figure 3A cross-sectional view of a carbon fiber core optical fiber composite ground wire is provided for another embodiment of the present application.

[0024] Explanation of reference numerals:

[0025] 1: optical unit; 11: housing; 12: optical communication member;

[0026] 2: protective shell; 21: aluminum profile; 211: aluminum shell; 212: steel core;

[0027] 3: carbon fiber assembly; 31: carbon fiber composite pole; 311: isolation shell; 312: core body. DETAILED DESCRIPTION

[0028] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not intended to limit the present application.

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0030] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combination thereof.

[0031] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the embodiments are not meant to limit the scope of the present application. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship.

[0032] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. The orientation words "inner, outer" refer to the inner and outer of the profile of each component itself.

[0033] It should also be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple", "several" is two or more, unless otherwise explicitly specified and limited.

[0035] In the prior art, the air between the overhead ground wire and the conductor is the core insulating medium, and the reduction of the distance will directly reduce the withstand voltage capability of the air insulation, resulting in the following problems:

[0036] Partial discharge under normal operating voltage; if the distance is too small, the strong electric field on the surface of the conductor will cause corona discharge between the ground wire and the conductor, resulting in visible blue halo, buzzing sound, accompanied by power loss, which will accelerate the metal corrosion of the conductor and the ground wire in the long run.

[0037] Direct breakdown (i.e. flashover) under overvoltage; during line operation, operating overvoltage (such as switch closing or opening) and lightning overvoltage (lightning near the line) often occur, at which time the voltage will increase several times. If the distance between the ground wire and the conductor is insufficient, the air gap will be directly broken down, forming a ground wire-conductor short circuit, resulting in line tripping, and even burning the metal conductor of the conductor and the ground wire.

[0038] The protection angle becomes larger, and the conductor is exposed to the lightning strike area; the distance between the ground wire and the conductor is reduced, the protection angle exceeds the safety threshold, the conductor is out of the shielding range of the ground wire, and lightning is more likely to directly hit the conductor, which can instantly burn the conductor and the insulator, and even cause line breakage and tower collapse.

[0039] The electromagnetic induction is enhanced, and the additional power loss is increased; when the conductor transmits alternating current, an alternating magnetic field is generated, and the overhead ground wire in the magnetic field will induce eddy current and circulating current, and the induced loss is increased. Long-term operation will reduce the power transmission efficiency of the line and increase the energy consumption cost. In addition, the eddy current heating will accelerate the metal fatigue of the ground wire and shorten its service life.

[0040] For a better understanding of the present application, please refer to Figures 1 to 3 The carbon fiber core optical fiber composite ground wire provided by the present application will be described. The carbon fiber core optical fiber composite ground wire comprises an optical unit 1, a protective shell 2, and a carbon fiber assembly 3; the protective shell 2 comprises a plurality of aluminum wires 21, the plurality of aluminum wires 21 are concentrically stranded and arranged around the outer periphery of the optical unit 1, and adjacent two aluminum wires 21 are in contact with each other; the carbon fiber assembly 3 comprises a plurality of carbon fiber composite rods 31, the plurality of carbon fiber composite rods 31 are respectively located between the optical unit 1 and the plurality of aluminum wires 21 and are concentrically stranded on the outer periphery of the optical unit 1, and the stranding directions of the plurality of carbon fiber composite rods 31 and the plurality of aluminum wires 21 are opposite, and adjacent two carbon fiber composite rods 31 are in contact with each other.

[0041] It should be noted that the present application is divided into three layers from inside to outside, and the innermost optical unit 1 layer is used for optical fiber signal transmission; the middle carbon fiber composite layer is used for weight reduction and lightning heat shielding; and the outer layer of the aluminum wire 21 is used for lightning conduction and heat conduction.

[0042] It should be noted that the carbon fiber composite material is lighter than the traditional metal material, only 1 / 5 of the weight of steel, and has a strength of more than 3 times that of steel. The use of carbon fiber composite rods 31 can reduce the weight of the composite ground wire and improve the weight-to-strength ratio. Compared with the existing grounding conductor, the sinking distance of the composite ground wire can be significantly shortened, and the safety of line operation can be improved. Because the carbon fiber material and the optical fiber material have similar tensile modulus and breaking elongation, the ground wire has higher tensile, wind load and vibration resistance when the stress changes, the signal loss of the optical fiber is reduced, and the communication quality is ensured.

[0043] It should be noted that the carbon fiber composite rod 31 is a non-metallic material and has no magnetism, which can reduce the eddy current loss from the source, unlike the traditional steel core which generates strong eddy current in the alternating magnetic field; the aluminum wire 21 forms a continuous conduction path through concentric stranding, has small contact resistance, and can reduce the circulating current loss; the reduction of eddy current heating can avoid the accelerated aging of the aluminum wire 21 and the carbon fiber assembly 3 due to high temperature, and the carbon fiber composite rod can also block the harmful effects of heat generated by the outer aluminum wire on the optical unit, greatly prolonging the service life of the overhead ground wire.

[0044] It should be noted that the concentric stranding refers to taking one or more conductors as a central reference, and the remaining conductors are wound in layers outside the central conductor according to the geometric law of concentric circles, and finally a whole circular cross-section conductor is formed.

[0045] It should be noted that the adjacent aluminum wires 21 are in contact with each other, and the carbon fiber rods are in close contact with each other, eliminating internal gaps, making the overall structure of the ground wire compact, reducing the outer diameter and weight, and directly relieving the sinking trend of the ground wire caused by the increase of optical fibers; at the same time, the gapless structure reduces wind resistance, reduces wind swing in strong wind weather, avoids fluctuation of distance from the conductor, and reduces ice accumulation space when icing. The adjacent aluminum wires 21 are in contact with each other to form a continuous conductive path, reduce the contact resistance between the aluminum wires 21, and further reduce the eddy current and circulating loss, solving the problem of large contact resistance and increased loss caused by the gap between the traditional aluminum strands. The continuous conductive path can better shunt lightning current and enhance the lightning protection function of the ground wire.

[0046] In specific implementation, the concentric stranding structure of the aluminum wires 21 and the carbon fiber composite rods 31 makes the layers of the ground wire closely fit without obvious gaps, which can reduce wind resistance, reduce wind swing in strong wind weather, and avoid fluctuation of distance from the conductor on the one hand; on the other hand, it can uniformly disperse the icing load and prevent ground wire fracture caused by local overload, especially suitable for snowy weather, further relieving the impact of icing on the distance. In addition, the aluminum wires 21 can be made of corrosion-resistant aluminum alloy, and the carbon fiber itself is resistant to acid and alkali corrosion, making the ground wire suitable for harsh environments such as coastal areas and industrial pollution areas, and large-span lines, improving the overall environmental adaptability.

[0047] The carbon fiber core optical fiber composite ground wire provided in the embodiment, compared with the prior art, the optical unit 1 is the core carrier of optical fiber communication and is specially used for accommodating multiple optical fibers required by the smart grid. The multiple aluminum wires 21 are concentrically stranded to form a protective shell 2, which can be used as a conductive path of the ground wire to assist in shunting lightning current on the one hand, and form a tight mechanical protection structure on the other hand by concentric stranding to isolate the impact of external weather factors on the internal optical unit 1 and the carbon fiber assembly 3; the density of the multiple carbon fiber composite rods 31 is only 1 / 4 of that of steel, which is high-strength and lightweight. By arranging the carbon fiber composite rods 31 between the optical unit 1 and the aluminum wires 21 and concentrically stranding them, the main tension of the ground wire can be replaced by the traditional steel core without replacing the tower, the overall weight is reduced, the tower remains unchanged, and the line tension remains unchanged, which can greatly reduce the ground wire sag; the concentric stranding structure can uniformly transmit the tension of the carbon fiber composite rods 31, avoid local stress concentration, and form a stable three-layer structure with the optical unit 1 and the aluminum wires 21, thereby improving the overall mechanical stability.

[0048] In some embodiments, reference is made to Figures 1 to 3The optical unit 1 comprises a shell 11 and optical communication components 12. The shell 11 is in a cylindrical structure, and the optical communication components 12 are located inside the shell 11. The outer circumferential surface of the shell 11 is attached to a plurality of carbon fiber composite rods 31.

[0049] The cylindrical shell 11 completely covers the optical communication components 12, forming a physical barrier to isolate external water vapor, dust, and mechanical extrusion during icing, thereby avoiding communication interruption caused by moisture corrosion or physical damage to the optical fiber. At the same time, the outer circumferential surface of the shell 11 is attached to the carbon fiber composite rods 31, which can limit the deformation of the shell 11 through the high strength of the carbon fiber composite rods 31, further protecting the internal optical communication components 12 and ensuring real-time communication required by the smart grid. The symmetry of the cylindrical shell 11 enables it to be in uniform contact with multiple carbon fiber composite rods 31. When the ground wire is subjected to tension caused by icing and strong winds, the tension of the carbon fiber composite rods 31 can be uniformly transmitted to the optical unit 1 through the outer circumferential surface of the shell 11, avoiding local stress concentration that may cause the shell 11 to break or the optical communication components 12 to be damaged.

[0050] In some embodiments, a heat-insulating buffer grease is provided inside the shell 11, and the plurality of optical communication components 12 are in contact with the heat-insulating buffer grease. The heat-insulating buffer grease has excellent heat-insulating properties, which can isolate the heat outside the shell 11, allowing the optical communication components 12 to be in a stable temperature environment, avoiding increased optical fiber attenuation or damage to the optical module caused by high temperatures, ensuring stable communication performance, and reducing the impact of high temperatures on the service life of the optical communication components 12.

[0051] In specific implementations, the heat-insulating buffer grease is a viscous colloid that can wrap and fix the optical communication components 12. When the ground wire vibrates, the grease can absorb vibration energy and buffer the impact of the optical communication components 12 and the shell 11, avoiding micro-bending or breakage of the optical fiber caused by vibration, especially in windy areas, improving communication reliability. The heat-insulating buffer grease can fill all gaps inside the shell 11, forming a sealed barrier to prevent the entry of corrosive media such as water vapor and salt, avoiding moisture corrosion of the optical communication components 12, greatly improving the corrosion resistance of the optical unit 1, making the ground wire suitable for high-humidity and salt spray environments, and prolonging the service life of the optical communication components 12. The smart grid requires stable arrangement of the optical communication components 12 to avoid signal interference. The heat-insulating buffer grease can fix multiple optical fibers at the predetermined position, preventing the optical fibers from shaking or winding inside the shell 11, reducing optical signal crosstalk or attenuation caused by the displacement of the optical fibers, ensuring the signal quality stability of the power grid state monitoring, data transmission, and other services, avoiding power grid scheduling errors caused by signal fluctuations, and improving the safety of line operation.

[0052] In some embodiments, the shell 11 is a stainless steel belt wound into a cylindrical structure. The stainless steel belt has high tensile strength and impact resistance, and after being wound into a cylinder, it forms a rigid shell 11 that can withstand the tension of the carbon fiber composite rod 31 and the aluminum profile 21, preventing the shell 11 from deforming due to excessive tension, while resisting external force impacts such as icing and wind load, preventing the internal optical communication components 12 from being exposed and damaged, and ensuring the structural integrity of the optical unit 1 under large-span and high-tension working conditions. The stainless steel belt has excellent salt spray resistance, acid and alkali resistance, and the oxide film formed on its surface can prevent the penetration of corrosive media, preventing the shell 11 from rusting and breaking, and further preventing water vapor and salt from entering the optical unit 1 to corrode the optical communication components 12, greatly extending the service life of the optical unit 1.

[0053] In specific implementation, the cylindrical shell 11 wound by the stainless steel belt has a smooth outer periphery, which can closely fit the carbon fiber composite rod 31, reduce internal gaps, improve the overall structural compactness of the ground wire, reduce weight, and help alleviate the sinking trend of the ground wire, avoid reducing the distance between the ground wire and the conductor, and reduce the risk of flashover. The stainless steel belt has certain electromagnetic shielding performance, which can weaken the influence of external magnetic fields on the internal optical communication components 12, prevent optical signals from being attenuated or distorted due to electromagnetic interference, and ensure stable transmission of Internet of Things data, line fault warning signals, and other signals in the smart grid.

[0054] In some embodiments, referring to Figure 3 , the carbon fiber composite rod 31 is a round rod, and the center lines of the multiple carbon fiber composite rods 31 are parallel to each other. The multiple carbon fiber composite rods 31 are concentrically twisted and arranged in the optical unit 1. In this embodiment, the single-core cross-sectional area of the carbon fiber composite rod 31 is increased, the distance between the optical unit 1 and the outer aluminum profile 21 is small, the compression resistance of the core rod is increased, and the strength of the ground wire and the fitting are improved. The processing technology of the carbon fiber round rod is mature, the production efficiency is high, and the cost is relatively low, which is suitable for large-scale smart grid construction needs.

[0055] In this embodiment, the outer periphery of the round rod is smooth and symmetrical, and the contact area with the shell 11 of the optical unit 1 and the aluminum profile 21 is uniform. When the ground wire is under tension, the tension can be uniformly transmitted to each component through the round rod, avoiding local stress concentration and preventing the carbon fiber composite rod 31 from breaking or the shell 11 of the optical unit 1 from being damaged, ensuring the structural integrity of the ground wire under high-tension working conditions. The center lines of the multiple carbon fiber round rods are parallel to each other and concentrically twisted and arranged in the optical unit 1, so that the positions of the round rods are fixed and there is no relative sliding between them, forming a stable annular support structure and improving the overall wind vibration resistance of the ground wire. The concentric twisting structure makes the center of gravity of the ground wire centered, avoiding the increase in wind swing amplitude due to the offset of the center of gravity in strong wind weather, maintaining uniform spacing with the conductor, and reducing spacing fluctuations. In the icing condition, the annular structure can uniformly disperse the ice load, avoiding local overload leading to rod deformation.

[0056] In some embodiments, referring to Figure 3The carbon fiber composite rod 31 comprises a core 311 and an isolation shell 312, the core 311 is installed inside the isolation shell 312, the isolation shell 312 is made of metal, and the contact area between the isolation shell 312 and the optical unit 1 is smaller than the contact area between the isolation shell 312 and the aluminum profile 21.

[0057] In specific implementation, the isolation shell 312 is made of aluminum, or made of steel or copper. The core 311 is a carbon fiber composite core.

[0058] In this embodiment, the isolation shell 312 can increase or decrease the friction between the carbon fiber composite rod 31 and the aluminum profile 21, improve the holding force of the pre-stranded strain clamp on the ground wire, increase the ground wire tension ratio, can resist thicker ice, and does not break the wire. The isolation shell 312 can also seal the carbon fiber composite rod 31, avoid contact between the carbon fiber composite rod 31 and the external environment, reduce the aging of the composite material, and have a longer service life.

[0059] It should be noted that the small area inside the isolation shell 312 contacts the optical unit 1, which can reduce the extrusion stress on the shell 11 of the optical unit 1, and avoid deformation and damage of the internal optical communication component 12 due to extrusion. The large area on the outside contacts the aluminum profile 21, which can increase the stress area with the aluminum profile 21, better transfer and disperse the wind load and ice load borne by the aluminum profile 21, and enhance the overall carrying capacity of the ground wire.

[0060] In some embodiments, referring to Figure 1 The optical communication component 12 comprises a plurality of optical fibers, the plurality of optical fibers are parallel to each other, and the number of optical fibers is even. The plurality of optical fibers can be flexibly allocated according to business needs, adapt to the increasing trend of intelligent power grid functions, ensure the expansibility of the communication system, avoid business interruption caused by insufficient capacity, and ensure the intelligent operation and maintenance of the power grid. At the same time, the symmetrical arrangement of the even number of optical fibers can balance the center of gravity of the optical unit 1, avoid eccentric swinging of the ground wire caused by asymmetric arrangement of the optical fibers, maintain uniform spacing with the conductor, reduce the risk of flashover, and correspond to the demand of "ensuring safe operation of the line" in the background. The even number of parallel arranged optical fibers can be adapted to the cylindrical shell 11, filled uniformly, and avoid optical fiber shaking caused by local gaps; at the same time, the symmetrical arrangement of the even number of optical fibers facilitates quick positioning of the faulty optical fiber during maintenance, reduces maintenance time and cost.

[0061] In some embodiments, referring to Figure 1 and Figure 2 The aluminum profile 21 comprises an aluminum shell 211 and a steel core 212, the steel core 212 is arranged inside the aluminum shell 211, and adjacent aluminum shells 211 abut each other. The arrangement of the steel core 212 can enhance the diversion and absorption effect of lightning, avoid the overall use of aluminum for the aluminum profile 21, prolong the protection period of the outer layer, and increase the service life of the aluminum profile 21.

[0062] In some embodiments, the carbon fiber composite rod 31 has a self-checking optical fiber inside. The self-checking optical fiber is built inside the carbon fiber composite rod 31 and can monitor the tension, strain and damage of the rod body in real time through changes in optical signals. When the tension of the rod body increases, the optical attenuation of the self-checking optical fiber will increase. When micro-cracks occur, the optical signal will change abruptly. These changes can be fed back to the power grid monitoring center in real time through the optical monitoring system, realizing early warning of faults and avoiding the sinking of the ground wire due to the sudden breakage of the carbon fiber rod. The self-checking optical fiber works cooperatively with the communication optical fiber of the optical unit 1. The communication optical fiber is responsible for power grid service transmission, and the self-checking optical fiber is responsible for the self-state monitoring of the ground wire and provides data support for the smart grid.

[0063] In some embodiments, the monitoring signal of the self-checking optical fiber can realize accurate positioning of the fault point through an optical time domain reflectometer (OTDR). When a section of the carbon fiber rod is damaged, the specific location can be accurately positioned, solving the problem of traditional ground wire fault troubleshooting that requires step-by-step disassembly, greatly reducing the maintenance time and cost, and not needing to replace the entire ground wire, but only needing to replace the faulty section of the carbon fiber rod, thereby reducing the operation and maintenance cost.

[0064] In some embodiments, referring to Figure 2 and Figure 3 , the cross section of the aluminum wire 21 is in the shape of a tile, and the outer circumferential center of the aluminum wire 21 and the inner circumferential center of the aluminum wire 21 respectively fall on the central axis of the optical unit 1.

[0065] The cross section of the tile-shaped aluminum strand is arc-shaped, and the outer arc surface is smooth, which can disperse the electric field intensity on the surface of the conductor and reduce the corona discharge under high-voltage working conditions. The outer circumferential center and the inner circumferential center of the aluminum wire 21 both fall on the central axis of the optical unit 1, ensuring that the aluminum wire 21 is concentric after being twisted, the center of gravity is in the middle, avoiding the inclination of the ground wire due to eccentricity and the increase in the swing amplitude of the wind deflection under strong wind weather, maintaining the uniform spacing with the conductor and reducing the spacing fluctuation. The arc-shaped cross section of the tile-shaped aluminum strand can closely fit with the adjacent aluminum wire 21, reducing the gap between the aluminum wires 21, forming a continuous conductive layer, reducing the contact resistance, and further reducing the eddy current and circulating current loss. At the same time, the high filling rate makes the outer diameter of the ground wire smaller under the same conductive cross-sectional area, and the weight is lighter, which can help to alleviate the sinking trend of the ground wire and avoid the reduction of the spacing with the conductor.

[0066] In specific implementation, the inner circumferential center of the tile-shaped aluminum strand coincides with the central axis of the optical unit 1, so that it can closely fit with the internal carbon fiber composite rod 31, reducing the internal gap and improving the compactness of the overall structure of the ground wire. At the same time, the concentric tile-shaped structure uniformly transmits the tension of the aluminum wire 21 to the carbon fiber composite rod 31, avoiding local stress concentration and enhancing the overall mechanical strength. The outer circumferential arc of the tile-shaped aluminum strand reduces wind resistance, wind-induced vibration noise and wind deflection, and is suitable for strong wind areas, further maintaining the safe spacing with the conductor and prolonging the service life of the ground wire.

[0067] The following is one way of manufacturing the ground wire provided in the present application:

[0068] The first step, the manufacture of the optical unit 1: according to the process requirements, the single-mode bare optical fiber is uniformly and combined, and is drawn out; it is stacked on a stainless steel belt, the width of the stainless steel belt is determined according to the pipe circumference, on a cladding welding machine, the stainless steel belt is gradually rolled into a tube, after the combined optical fiber is cladded, filled with oil paste, and laser welded, the outer diameter of the welded stainless steel tube is accurately and normatively through an extrusion die.

[0069] The second step, the manufacture of the single-core carbon fiber composite core rod: pultrusion manufacturing.

[0070] The third step, on the combined bundle production line, the optical unit 1 is combined with the carbon fiber core rod, the optical unit 1 is located at the center, 6-7 carbon fiber composite core rods are combined in parallel at the periphery, and the shape is determined through preforming. After weaving and aluminum foil cladding, the optical unit 1 and the core rod are fixed into a rod-shaped bundle type core rod.

[0071] The fourth step, the stranding: on a frame stranding machine or a cage stranding machine, the aluminum wire or the aluminum-clad steel wire is concentrically stranded with the bundle type core rod into the ground wire.

[0072] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A carbon fiber core optical fiber composite ground wire, characterized in that, include: Optical unit (1); The protective shell (2) includes a plurality of aluminum profiles (21), which are concentrically twisted and arranged around the outer periphery of the optical unit (1), with adjacent aluminum profiles (21) in contact with each other; and The carbon fiber assembly (3) includes multiple carbon fiber composite rods (31), which are respectively located between the optical unit (1) and the multiple aluminum profiles (21) and are concentrically twisted around the outer periphery of the optical unit (1). The twisting directions of the multiple carbon fiber composite rods (31) and the multiple aluminum profiles (21) are opposite, and two adjacent carbon fiber composite rods (31) are in contact with each other. The carbon fiber composite rod (31) is a non-metallic material and is non-magnetic; The carbon fiber composite rod (31) includes a core (311) and an isolation shell (312). The core (311) is installed inside the isolation shell (312). The isolation shell (312) is made of metal. The contact area between the isolation shell (312) and the optical unit (1) is smaller than the contact area between the isolation shell (312) and the aluminum profile (21).

2. The carbon fiber core optical fiber composite ground wire as described in claim 1, characterized in that, The optical unit (1) includes a housing (11) and an optical communication component (12). The housing (11) is a cylindrical structure. The optical communication component (12) is located inside the housing (11). The outer circumferential surface of the housing (11) is respectively attached to a plurality of carbon fiber composite rods (31).

3. The carbon fiber core optical fiber composite ground wire as described in claim 2, characterized in that, The housing (11) is provided with heat-insulating buffer grease, and the plurality of optical communication components (12) are in contact with the heat-insulating buffer grease respectively.

4. The carbon fiber core optical fiber composite ground wire as described in claim 2, characterized in that, The outer shell (11) is a stainless steel strip wound into a cylindrical structure.

5. The carbon fiber core optical fiber composite ground wire as described in claim 1, characterized in that, The carbon fiber composite rod (31) is a round rod, and the center lines of multiple carbon fiber composite rods (31) are parallel to each other. Multiple carbon fiber composite rods (31) are concentrically twisted in the optical unit (1).

6. The carbon fiber core optical fiber composite ground wire as described in claim 2, characterized in that, The optical communication component (12) includes multiple optical fibers, which are parallel to each other, and the number of optical fibers is even.

7. The carbon fiber core optical fiber composite ground wire as described in claim 1, characterized in that, The aluminum profile (21) includes an aluminum shell (211) and a steel core (212), the steel core (212) being disposed inside the aluminum shell (211), and adjacent aluminum shells (211) abutting against each other.

8. The carbon fiber core optical fiber composite ground wire as described in claim 1, characterized in that, The carbon fiber composite rod (31) has a self-testing optical fiber inside.

9. The carbon fiber core optical fiber composite ground wire as described in claim 1, characterized in that, The cross-section of the aluminum profile (21) is tile-shaped, and the outer circumference center and the inner circumference center of the aluminum profile (21) fall on the central axis of the optical unit (1).

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