Large-section low-loss molded wire aluminum split conductor

Abstract

The invention relates to the technical field of cables, in particular to a large-section low-loss molded wire aluminum split conductor which comprises four fan-shaped strand blocks and a center line. According to the large-section low-loss molded wire aluminum split conductor, the four-split design is adopted, the production efficiency is greatly improved, each strand block adopts the aluminum molded wires, the filling coefficient is higher, the conductor with the larger section can be obtained by increasing the sector width and the sector height of each trapezoidal monofilament, the conductor is not limited by the number of the monofilaments, and the production efficiency is improved. The situation that more strand blocks are needed to obtain a larger cross section like a compact circular shape, and a single strand block is limited by the number of monofilaments is avoided; the filling coefficient of the compressed molded line is far larger than that of a compressed circular molded line, the water blocking performance of the molded line is higher, strand blocks are separated by the insulating water blocking strips, the effects of water blocking and eddy current segmentation can be achieved, the skin effect and proximity effect loss can be reduced, and optical fibers in the insulating water blocking strips can monitor the operating temperature of a conductor and improve the operating safety.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a large-section low-loss aluminum segmented conductor. Background Art

[0002] With the rapid development of my country's national economy, users are increasingly inclined to choose cables with large cross-sections and high voltage and above. However, due to the existence of skin effect, the current tends to flow on the surface of the conductor, so that the current carrying capacity of the conductor does not increase linearly with the conductor cross-section. The larger the cross-sectional area of ​​the conductor, the more obvious the skin effect. It is clearly stipulated in GB / T 11017-2014, GB / T18890-2015 and other standards that a split conductor structure must be used when the cross-sectional area is 800mm2 or above to reduce the impact of the skin effect on the current carrying capacity of the cable.

[0003] In the prior art, according to the characteristics of the AC resistance of the conductor, a large-section conductor is divided into several strands and twisted together. The strands are separated by insulating corrugated paper to insulate the strands from each other. In this way, the conductor is equivalent to being composed of several mutually insulated fan-shaped strands in parallel. Since the cross-sectional area of ​​a single fan-shaped strand is only a few times the total cross-sectional area of ​​the conductor, the "skin effect" and "proximity effect" of a single strand are greatly reduced, thereby achieving the purpose of reducing the AC resistance of the conductor. The split conductor is generally composed of fan-shaped or corrugated strands, corrugated paper, semi-conductive nylon tape and a central filling unit, and its material is generally twisted copper wire (domestic) and solid copper (foreign). Defects: Each fan-shaped strand of the split conductor uses a compacted circular conductor, and the filling coefficient is not very high. In addition, since each strand is separated by corrugated paper, the gap is large, which leads to poor water-blocking performance of the split conductor. The main forms of split conductors are four-segment, five-segment, six-segment, seven-segment, etc. Since the number of single wires in a single strand is limited by the twisting equipment, more strands are required to prepare conductors with larger cross-sections, which increases the difficulty of the process and reduces production efficiency. At present, there is generally a filled center line in the center of the split conductor, but due to the existence of the skin effect, the center line rarely plays the role of transmitting current, resulting in a waste of raw materials, and it is impossible to detect the extrusion and bending state of the conductor in real time, resulting in a single functionality. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the current filling factor of the split conductor is not high, and due to the large gap between each strand block, the water barrier performance is poor, the production efficiency is reduced, the raw materials are seriously wasted, and the functionality is very simple.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a large-section low-loss aluminum segmented conductor, including four fan-shaped blocks and a center line, the center line includes a Z-shaped copper wire twisted on the outside of a carbon fiber core rod, the outside of the Z-shaped copper wire is coated with insulating paint, the fan-shaped block is formed by twisting a plurality of trapezoidal aluminum conductors through a fan-shaped compacting mold, each layer of aluminum conductor surface in the fan-shaped block is coated with carbon nanotubes, a plurality of heat pipes are placed in the center, the connecting surfaces on both sides of the fan-shaped block are separated by insulating water-blocking strips, an optical fiber unit is arranged inside the insulating water-blocking strip, a shock-absorbing airbag for inflation is arranged inside the insulating water-blocking strip at the periphery of the optical fiber unit, and a layer of semi-conductive nylon tape and a layer of semi-conductive water-resistant binding tape are wrapped around the fan-shaped block.

[0006] The shock-absorbing airbag includes an inner airbag arranged inside the optical fiber unit, an outer airbag arranged outside the optical fiber unit and lateral connecting tubes located on both sides of the optical fiber unit. The inner airbag and the outer airbag are connected in series via the lateral connecting tubes.

[0007] A pressure monitoring module is fixedly installed inside the internal airbag.

[0008] An embedded serpentine internal air guide tube is arranged inside the insulating water-blocking strip and located inside the internal air bag, and an embedded serpentine external air guide tube is arranged outside the external air bag in the insulating water-blocking strip.

[0009] Self-adhesive sealing tape is adhered to the inner walls of the outer air guide openings of the inner air guide pipe of the serpentine structure and the outer air guide pipe of the serpentine structure.

[0010] The inner arc surface of the profile aluminum conductor and the outer arc surface of the Z-shaped copper profile are both provided with raised lateral limiting convex strips, and the lateral limiting convex strips on the inner arc surface of the profile aluminum conductor and the outer arc surface of the Z-shaped copper profile are staggered.

[0011] The outer end of the insulating water-blocking strip has a lateral extension section covering the surfaces of the fan-shaped stock blocks on both sides, and the two side surfaces of the lateral extension section are respectively adhered and fixed to the outer surface of the fan-shaped stock block and the inner side surface of the semi-conductive nylon belt.

[0012] The insulating water-blocking strip is composed of a double-layer insulating water-blocking cloth strip covering both sides of the optical fiber unit, the shock-absorbing airbag, the internal air guide tube of the serpentine structure and the external air guide tube of the serpentine structure.

[0013] The side connecting tube has an arc-shaped supporting surface on the surface adjacent to the optical fiber unit, and the inner width of the side connecting tube gradually increases from the center to the connecting ends on both sides.

[0014] The beneficial effects of the present invention are: (1) The large-section low-loss aluminum split conductor of the present invention adopts a 4-segment design, which greatly improves the production efficiency. Each strand block adopts an aluminum wire, and the filling factor is higher. A conductor with a larger cross-section can be obtained by increasing the fan width and fan height of each trapezoidal single wire, which is not limited by the number of single wires. Unlike the compressed round type, more strands are required to obtain a larger cross-section, and a single strand block is limited by the number of single wires. (2) The filling factor of the compressed profile is much greater than that of the compressed circular profile, and the water-blocking performance is stronger. Each strand is separated by an insulating water-blocking strip, which can block water and divide eddy currents, reducing skin effect and proximity effect losses. The optical fiber in the insulating water-blocking strip can monitor the temperature of the conductor and improve operating safety. (3) The center line uses a high-strength carbon fiber core rod, which can bear the weight of the conductor well and has good thermal conductivity, which can reduce some of the heat generated during the operation of the conductor. The core rod has a Z-shaped copper wire outside and an insulating paint on the surface, which can reduce the skin effect loss; (4) By providing a shock-absorbing airbag around the optical fiber, the safety and stability of the optical fiber during squeezing can be greatly improved; (5) A pressure monitoring module is set inside the shock-absorbing airbag. Through a uniform arrangement, the state of the conductor can be judged according to the pressure changes at different positions, which greatly improves the functionality; (6) By adopting a staggered layout of lateral limiting convex strips, the firmness and stability of the internal structure of the conductor can be improved; (7) The shock-absorbing airbags are designed with a series structure, which can be connected in series or closed individually at the ends, making connection and sealing easier; (8) The air duct with serpentine structure design can improve the uniformity of the extrusion surface and ensure consistent shock absorption effect; (9) Each layer of conductor is coated with carbon nanotubes, which have excellent conductivity and can increase the current carrying capacity of the conductor; (10) There are multiple heat pipes placed in the center. The heat pipe shell is made of copper, the core is sintered, and there is a liquid with a very low boiling point inside. The heat is dissipated through the evaporation and condensation of the fluid, which can achieve excellent heat dissipation effect and greatly improve the current carrying capacity of the conductor. At the same time, there is an optical fiber in the center of the heat pipe, which can monitor the temperature and operating status of the entire conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of the insulating water-blocking strip in the present invention.

[0018] Figure 3 It is a cross-sectional view of the insulating water-blocking strip of the present invention. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Figure 1 , Figure 2 and Figure 3 A large-section, low-loss aluminum split conductor is shown, comprising four fan-shaped strands and a center line. The center line comprises a carbon fiber core rod 1 with a Z-shaped copper wire 2 twisted on the outside. The Z-shaped copper wire 2 is coated with insulating paint on the outside. The fan-shaped strand is formed by twisting 20 trapezoidal aluminum conductors 3 through a fan-shaped compacting mold. The surface of each layer of aluminum conductor 3 in the fan-shaped strand is coated with carbon nanotubes. The carbon nanotubes have excellent conductivity and can increase the current carrying capacity of the conductor. There are 6 heat pipes placed in the center. The heat pipe shell is made of copper, the tube core is sintered, and there is a liquid with a very low boiling point inside. The heat is dissipated by evaporation and condensation of the fluid, which can achieve excellent heat dissipation effect and greatly improve the current carrying capacity of the conductor. At the same time, there is an optical fiber in the center of the heat pipe, which can monitor the temperature and operating status of the entire conductor. The connecting surfaces on both sides of the fan-shaped block are separated by an insulating water-blocking strip 5, and an optical fiber unit 6 is arranged inside the insulating water-blocking strip 5. A shock-absorbing airbag 7 for inflation is arranged inside the insulating water-blocking strip 5 and outside the optical fiber unit 6. A layer of semi-conductive nylon belt 8 and a layer of semi-conductive water-resistant binding belt 9 are wrapped around the fan-shaped block.

[0022] In order to improve the shock absorption of the inner side of the connecting end, the shock-absorbing airbag 7 includes an internal airbag 71 arranged on the inner side of the optical fiber unit 6, an external airbag 72 arranged on the outer side of the optical fiber unit 6 and lateral connecting tubes 73 located on both sides of the optical fiber unit 6. The internal airbag 71 and the external airbag 72 are connected in series with each other through the lateral connecting tubes 73.

[0023] In order to monitor the external pressure, bending or twisting state in real time, a pressure monitoring module 10 is fixedly installed inside the internal airbag 71 .

[0024] When the pressure monitoring modules 10 at all positions produce the same pressure change, it means that the conductor is twisted; when the same pressure change occurs on both sides of the fan-shaped stock blocks on the opposite sides, it means that pressure occurs on the periphery of the fan-shaped stock block on one side; when different pressure changes occur on both sides of the fan-shaped stock blocks on the opposite sides, it means that the periphery of the fan-shaped stock block on one side is bent; and when the same pressure change occurs on both sides of the fan-shaped stock blocks on the adjacent sides, it means that pressure occurs between the fan-shaped stock blocks on both sides; then the position of occurrence is determined by the change position of the pressure monitoring module 10. .

[0025] In order to cooperate with the stability of internal heat dissipation and lateral support, an embedded serpentine internal air guide tube 74 is arranged inside the insulating water-blocking strip 5 on the inner side of the internal air bag 71, and an embedded serpentine external air guide tube 75 is arranged outside the external air bag 72 in the insulating water-blocking strip 5.

[0026] In order to improve the connectivity and sealing of the air guide ports, self-adhesive sealing tapes 76 are adhered to the inner walls of the outer air guide ports of the serpentine structure internal air guide tube 74 and the serpentine structure external air guide tube 75 .

[0027] During assembly, the air nozzle of the external air pump is inserted into the outer air port of the internal air pipe 74 of the serpentine structure or the external air pipe 75 of the serpentine structure, and then air is supplied inward. When the shock-absorbing airbag 7 is filled with air, the anti-sticking paper on the surface of the self-adhesive sealing tape 76 is torn off, and the outer air port is closed and sealed with the self-adhesive sealing tape 76. When it is necessary to extend the length of the entire insulating water-blocking strip 5, it is only necessary to connect the adjacent outer air ports in series with each other through the series air nozzles, and then use the self-adhesive sealing tape 76 to stick and fix them to complete the series connection.

[0028] In order to improve the lateral limiting capacity of the assembly end, both the inner curved surface of the profiled aluminum conductor 3 and the outer curved surface of the Z-shaped copper profile 2 are provided with raised lateral limiting ridges 11, and the lateral limiting ridges 11 on the inner curved surface of the profiled aluminum conductor 3 and the outer curved surface of the Z-shaped copper profile 2 are staggered.

[0029] In order to improve the firmness and stability of the connecting end of the insulating water-blocking strip 5, the outer end of the insulating water-blocking strip 5 has a lateral extension section that covers the surface of the fan-shaped stock blocks on both sides, and the two side surfaces of the lateral extension section are respectively adhered and fixed to the outer surface of the fan-shaped stock block and the inner side of the semi-conductive nylon tape 8.

[0030] In order to facilitate production and assembly, the insulating water-blocking strip 5 is composed of a double-layer insulating water-blocking cloth strip covering both sides of the optical fiber unit 6, the shock-absorbing airbag 7, the serpentine structure internal air guide tube 74 and the serpentine structure external air guide tube 75.

[0031] In order to improve the air guiding effect and the inner supporting force, the lateral connecting tube 73 has an arc-shaped supporting surface on the surface adjacent to the optical fiber unit 6, and the inner width of the lateral connecting tube 73 gradually increases from the center to the connecting ends on both sides.

[0032] The production process of the invented large-section low-loss aluminum split conductor includes: the aluminum conductor 3 is drawn from an aluminum single wire, the Z-shaped copper wire 2 is drawn from a copper single wire, the Z-shaped copper wire 2 single wires are twisted, and insulating paint is applied. Then, four insulating water-blocking strips 5 with optical fiber units 6, shock-absorbing airbags 7, serpentine internal air guide tubes 74 and serpentine external air guide tubes 75 are arranged on the outside of the center line. Then, fan-shaped strand blocks twisted through the aluminum conductor 3 are arranged on both sides of the insulating water-blocking strip 5. The four fan-shaped strand blocks are cabled and then wrapped with a layer of semi-conductive nylon tape 8 and a layer of semi-conductive waterproof binding tape 9.

[0033] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A large-section low-loss aluminum split conductor, comprising four fan-shaped strands and a center line, characterized in that: The center line comprises a carbon fiber core rod (1) with a Z-shaped copper wire (2) twisted on the outside, the Z-shaped copper wire (2) is coated with insulating paint on the outside, the fan-shaped strand block is formed by twisting a plurality of trapezoidal aluminum wire conductors (3) through a fan-shaped compacting mold, each layer of aluminum wire conductors (3) in the fan-shaped strand block is coated with carbon nanotubes, a plurality of heat pipes are placed in the center, the connecting surfaces on both sides of the fan-shaped strand block are separated by an insulating water-blocking strip (5), an optical fiber unit (6) is arranged inside the insulating water-blocking strip (5), and a shock-absorbing airbag (7) for inflation is arranged inside the insulating water-blocking strip (5) and outside the optical fiber unit (6), and a layer of semi-conductive nylon tape (8) and a layer of semi-conductive water-resistant binding tape (9) are wrapped around the fan-shaped strand block.

2. The large-section low-loss aluminum segmented conductor according to claim 1 is characterized by: The shock-absorbing airbag (7) comprises an internal airbag (71) arranged on the inner side of the optical fiber unit (6), an external airbag (72) arranged on the outer side of the optical fiber unit (6), and lateral connecting tubes (73) located on both sides of the optical fiber unit (6); the internal airbag (71) and the external airbag (72) are connected in series via the lateral connecting tubes (73).

3. The large-section low-loss aluminum segmented conductor according to claim 1 is characterized by: A pressure monitoring module (10) is fixedly installed inside the internal airbag (71).

4. The large-section low-loss aluminum segmented conductor according to claim 1 is characterized by: An embedded serpentine structure internal air guide tube (74) is provided inside the insulating water-blocking strip (5) and located inside the internal air bag (71), and an embedded serpentine structure external air guide tube (75) is provided inside the insulating water-blocking strip (5) and located outside the external air bag (72).

5. The large-section low-loss aluminum segmented conductor according to claim 4 is characterized by: Self-adhesive sealing tape (76) is adhered to the inner walls of the outer air guide openings of the serpentine structure internal air guide tube (74) and the serpentine structure external air guide tube (75).

6. The large-section low-loss aluminum segmented conductor according to claim 4 is characterized by: The inner curved surface of the profiled aluminum conductor (3) and the outer curved surface of the Z-shaped copper profile (2) are both provided with raised lateral limiting convex strips (11), and the lateral limiting convex strips (11) on the inner curved surface of the profiled aluminum conductor (3) and the outer curved surface of the Z-shaped copper profile (2) are staggered.

7. The large-section low-loss aluminum segmented conductor according to claim 1 is characterized by: The outer end of the insulating water-blocking strip (5) has a lateral extension section that covers the surface of the fan-shaped stock blocks on both sides, and the two side surfaces of the lateral extension section are respectively adhered and fixed to the outer surface of the fan-shaped stock block and the inner side surface of the semi-conductive nylon belt (8).

8. The large-section low-loss aluminum segmented conductor according to claim 4 is characterized by: The insulating water-blocking strip (5) is composed of a double-layer insulating water-blocking cloth strip covering both sides of the optical fiber unit (6), the shock-absorbing airbag (7), the serpentine structure internal air guide tube (74) and the serpentine structure external air guide tube (75).

9. The large-section low-loss aluminum segmented conductor according to claim 2 is characterized by: The lateral connecting tube (73) has an arc-shaped supporting surface on a surface adjacent to the optical fiber unit (6), and the internal width of the lateral connecting tube (73) gradually increases from the center to the connecting ends on both sides.

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