Gap type cable
By setting surface contact current-carrying lines in the gap type cable and using grease, the problems of thick cables and poor snow resistance caused by large fluid conductor gaps are solved, and the effect of thinner cable diameter or stronger overcurrent capacity is achieved, reducing construction costs.
Patent Information
- Application Number
- CN202410518538.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-04-15
AI Technical Summary
The fluid conduction gap in existing gap cables has a large gap, resulting in a large cross-section of the cable, easy to solidify ice and snow, poor snow resistance, and high tower spacing requirements, and high construction costs.
By setting the current-carrying conductor formed by the current-carrying line in the surface contact, the gap between the fluid conductors is reduced, and the friction force is reduced by using grease, and the density and overcurrent capacity of the current-carrying conductor are improved.
The cable diameter with the same overcurrent capability is achieved by thinner or the overcurrent capability of equal diameter cables, which improves snow resistance, reduces tower rod construction costs, and improves the self-damping capability of the cable.
Smart Images
Figure CN119833206A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power transmission, and more particularly to a gap type cable. Background Art
[0002] The gap type cable includes a steel core and an external fluid conductor. The aluminum fluid conductor has excellent fluid conduction performance but weak mechanical strength, while the steel core has sufficient strength but insufficient fluid conduction performance. The two are used to complement each other to give full play to the performance of the materials.
[0003] However, the existing cables have a large gap between the conductors, which results in a larger cross-section of the cables. Ice and snow are easily frozen on the surface of the conductors. The cables are heavy, and the spacing between towers is required to be high, resulting in high construction costs for the towers.
[0004] There is an urgent need for a cable that can reduce the gap between the conductors, so that the diameter of the cable with the same flow capacity can be thinner or the flow capacity of the cable with the same diameter can be stronger to achieve the purpose of doubling the capacity. Summary of the invention
[0005] The present invention overcomes the disadvantage that the spacing between the conductors in the existing cables is large, which makes the cables thicker, and provides a gap-type cable, which reduces the gap between the conductors, so that the diameter of the cable with the same flow capacity is thinner or the flow capacity of the cable with the same diameter is stronger to achieve the purpose of doubling the capacity.
[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0007] A gap type cable comprises a current-carrying conductor and a tensile core. The current-carrying conductor is arranged on the periphery of the tensile core. The current-carrying conductor comprises a plurality of concentrically arranged current-carrying layers. The current-carrying layers are formed by twisting a plurality of current-carrying wires. The current-carrying wires have contact surfaces. Adjacent current-carrying wires are attached via at least part of the contact surfaces. Lubricating grease is provided between the current-carrying conductor and the tensile core.
[0008] The current-carrying conductor and the tensile core are responsible for conducting current and bearing tension respectively. The cable has sag when in working state, and the cable is subjected to tension. The tensile core separated from the current-carrying conductor bears all mechanical forces, thereby avoiding long-term stress on the current-carrying conductor and plastic creep at high temperature. In working state, as the operating temperature increases, due to the difference in linear expansion coefficient between the current-carrying conductor and the current-carrying conductor, the current-carrying conductor produces irreversible permanent deformation, and the stress transfer characteristic transfers the tension of the wire to the current-carrying conductor. All mechanical loads are borne by the steel core, and the current-carrying conductor is basically not subjected to stress, and its high-temperature sag is not affected by long-term creep. Grease reduces the friction between the current-carrying conductor and the tensile core, so that the friction generated by the relative movement between the current-carrying conductor and the tensile core after the deformation is smaller, reducing the stress accumulated in the cable due to high-temperature deformation.
[0009] The current-carrying wires are in surface contact with each other, thereby reducing the line contact between the current-carrying wires with circular cross-sections, making full use of the pores in the relevant technology, increasing the density of the current-carrying conductors under the same area, and having a higher area of the current-carrying conductors under the same cross-section, thereby improving the current carrying capacity and facilitating the realization of the purpose of doubling the capacity. Alternatively, the diameter of the cable can be reduced under the same current carrying capacity, thereby improving the snow resistance.
[0010] Preferably, the cross section of the current-carrying wire is in the shape of a fan ring. The cross sections of the current-carrying wires in the same current-carrying layer enclose a ring, and the inner diameter and outer diameter of the cross sections of each current-carrying wire are the same. Further, the shape can also make the outer current-carrying layer and the inner current-carrying layer fit together, thereby further improving the density of the current-carrying conductor.
[0011] Preferably, the ring widths corresponding to the current-carrying layers are different. Through the structure, the resonance frequencies of the current-carrying layers can be made inconsistent, thereby avoiding resonance in breeze vibration and mutual friction to enhance self-damping.
[0012] Preferably, the cross section of the current-carrying wire has an inner edge and an outer edge for fitting the current-carrying layer or the insulating layer of the tensile core and the outer layer, and a side edge connected to the current-carrying wire on both sides, and the side edge is arranged along the radial direction of the cable edge, or the side edge intersects with the radial direction. For the solution where the side edge intersects with the radial direction, the side edge of the current-carrying wire is longer than that arranged in the radial direction, thereby further increasing the area of the contact surface, thereby improving the self-damping effect.
[0013] Preferably, the side is a straight line or an arc. The arc-shaped side can further strengthen the twisting strength of the current-carrying conductor, limit the deformation direction of the current-carrying conductor at high temperature, produce the required deformation, achieve better load-current separation, make the current-carrying conductor bear less tension, and reduce the possibility of creep.
[0014] Preferably, the side includes a contact side and a non-contact side, and a damping cavity is formed between the two contact sides adjacent to the two current-carrying lines and the inner side of the outer current-carrying layer. When the two current-carrying lines are displaced under vibration, the volume of the damping cavity increases or decreases to absorb the vibration capacity. When the breeze vibrates, the adjacent current-carrying lines also vibrate and undergo elastic deformation. The volume change of the damping cavity can inhale or spit out the grease as a fluid. In addition to generating a lubricating film layer to reduce the wear of the side, this method can also be used to reduce vibration.
[0015] Preferably, the current-carrying layer comprises an inner current-carrying layer and an outer current-carrying layer, the inner current-carrying layer comprises ten current-carrying wires, and the outer current-carrying layer comprises fifteen current-carrying wires.
[0016] Preferably, the tensile core comprises tensile wires, the number of the tensile wires is 7, and the tensile core is formed by twisting the tensile wires.
[0017] Preferably, the material of the current-carrying wire is aluminum, and the material of the current-carrying wire is a soft aluminum wire with a conductivity of 63% IACS.
[0018] Preferably, the material of the tension wire is galvanized steel wire. The material of the galvanized steel wire is a round galvanized steel wire with a tensile strength of 1770 MPa.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] (1) By providing a current-carrying conductor composed of current-carrying wires in surface contact, the current carrying capacity under the same cross-section is improved and the capacity is doubled;
[0021] (2) With the same current capacity, the cable diameter is made smaller, which improves the conductor's ability to resist ice and snow;
[0022] (3) The internal wiring harnesses are in surface contact, which can consume more energy in breeze vibration, has better resistance to breeze vibration, and has better self-damping ability;
[0023] (4) The conductor surface is smooth, with less corona loss, less operating noise, and more environmentally friendly.
[0024] (5) On the basis of newly built or existing lines, the transmission capacity can be increased by simply replacing conductors with similar model parameters. Its size, tightness, tension and sag are smaller and better than ordinary steel-core aluminum stranded wires. It also reduces the corridor land and pole tower construction costs of the line, effectively utilizing the existing resources of the original line. It is easier to achieve the purpose of line transformation and capacity increase without expropriating land and replacing pole towers. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 is a cross-sectional schematic diagram of the present invention;
[0026] Figure 2 is a cross-sectional schematic diagram of another embodiment of the present invention;
[0027] Figure 3 is a cross-sectional schematic diagram of yet another embodiment of the present invention;
[0028] Figure 4 is a cross-sectional schematic diagram of another embodiment of the present invention;
[0029] In the figure:
[0030] The tensile core 1, the tensile wire 2, the current-carrying conductor 3, the inner current-carrying layer 4, the outer current-carrying layer 5, the current-carrying wire 6, the outer edge 7, the inner edge 8, the side edge 9, and the damping cavity 10. DETAILED DESCRIPTION
[0031] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.
[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0033] 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, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0034] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.
[0035] Example:
[0036] A gap type cable, Figure 1 As shown, it includes a current-carrying conductor 3 and a tensile core 1. The current-carrying conductor 3 is arranged on the periphery of the tensile core 1. As the name implies, the current-carrying conductor 3 is used to carry current, and the tensile core 1 is used to bear the gravity and tension of the cable. Based on the functions of the current-carrying conductor 3 and the tensile core 1, the material of the current-carrying wire 6 is aluminum. The material of the galvanized steel wire is a round galvanized steel wire with a tensile strength of 1770MPa.
[0037] The tensile core 1 includes seven tensile wires 2 , and the tensile core 1 is formed by twisting the tensile wires 2 .
[0038] The current-carrying conductor 3 includes a plurality of concentrically arranged current-carrying layers, which are formed by twisting a plurality of current-carrying wires 6 . The current-carrying wires 6 have contact surfaces, and adjacent current-carrying wires 6 are attached via at least a portion of the contact surfaces. Lubricating grease is provided between the current-carrying conductor 3 and the tensile core 1 .
[0039] Among them, the cross section of the current-carrying wire 6 is fan-shaped. The cross section of the current-carrying wire 6 in the same current-carrying layer encloses a circular ring, and the inner diameter and outer diameter of the cross section of each current-carrying wire 6 are the same. Further, the shape can also make the outer current-carrying layer and the inner current-carrying layer fit together, thereby further improving the density of the current-carrying conductor 3. The current-carrying layer includes an inner current-carrying layer 4 and an outer current-carrying layer 5, the inner current-carrying layer 4 includes ten current-carrying wires 6, and the outer current-carrying wire 6 includes fifteen current-carrying wires 6. The outer arc surface of the inner current-carrying wire 6 is also fitted with the inner arc surface of the outer current-carrying wire 6. The material of the current-carrying wire 6 is a soft aluminum wire with a conductivity of 63% IACS.
[0040] In some preferred embodiments, the ring widths corresponding to the current-carrying layers are different. Through the structure, the resonance frequencies of the current-carrying layers can be made inconsistent, thereby avoiding resonance in breeze vibration and mutual friction to enhance self-damping.
[0041] Furthermore, the cross section of the current-carrying wire 6 has an inner edge 8 and an outer edge 7 for fitting the tensile core 1 and the outer current-carrying layer or the insulating layer, and side edges 9 connected to the current-carrying wire 6 on both sides, and the side edges 9 are arranged along the radial direction of the cable edge, or the side edges 9 intersect with the radial direction. For the solution in which the side edges 9 intersect with the radial direction, the side edges 9 of the current-carrying wire 6 are longer than those arranged in the radial direction, thereby further increasing the area of the contact surface, thereby improving the self-damping effect. Among them, the side edges 9 are straight lines or arcs. The arc-shaped side edges 9 can further strengthen the stranding strength of the current-carrying conductor 3, limit the deformation direction of the current-carrying conductor 3 at high temperature, produce the required deformation, achieve better load-current separation, make the current-carrying conductor 3 bear less tension, and reduce the possibility of creep.
[0042] The intersection includes Figure 2 , 3 , with the oblique line or arc line having at most one intersection with any straight line passing through the center of the cable.
[0043] Ginseng Figure 4 As shown, in some embodiments, the side edge 9 includes a contact edge and a non-contact edge, and the two contact edges adjacent to the two current-carrying wires 6 and the inner edge 8 of the outer current-carrying layer form a damping cavity 10. When the two current-carrying wires 6 are displaced under vibration, the volume of the damping cavity 10 increases or decreases to absorb the vibration capacity. When the breeze vibrates, the adjacent current-carrying wires 6 also vibrate and undergo elastic deformation. The volume change of the damping cavity 10 generates a pressure difference with the outside world, and the grease as a fluid can be sucked in or spit out. In addition to generating a lubricating film layer to reduce the wear of the side edge 9, this method can also be used to reduce vibration.
[0044] The current-carrying conductor 3 and the tensile core 1 are responsible for conducting current and bearing tension respectively. When the cable is in working state, it has sag and is subjected to tension. The tensile core 1, which is separated from the current-carrying conductor 3, bears all mechanical forces, thereby preventing the current-carrying conductor 3 from being subjected to stress for a long time and causing plastic creep at high temperatures. In working state, as the operating temperature increases, due to the difference in linear expansion coefficients between the current-carrying conductor 3 and the current-carrying conductor 3, the current-carrying conductor 3 produces irreversible permanent deformation, and the stress transfer characteristic transfers the tension of the wire to the current-carrying conductor 3. All mechanical loads are borne by the steel core, and the current-carrying conductor 3 is basically not subjected to stress, and its high-temperature sag is not affected by long-term creep. Grease reduces the friction between the current-carrying conductor 3 and the tensile core 1, so that the friction generated by the relative movement between the current-carrying conductor 3 and the tensile core 1 after the deformation is smaller, thereby reducing the stress accumulated in the cable due to high-temperature deformation.
[0045] The current-carrying wires 6 are in surface contact with each other, thereby reducing the line contact between the current-carrying wires 6 with a circular cross-section, thereby making full use of the pores in the relevant technology, increasing the density of the current-carrying conductor 3 under the same area, and having a higher area of the current-carrying conductor 3 under the same cross-section, thereby improving the current carrying capacity and facilitating the realization of the purpose of doubling the capacity, or, the diameter of the cable can be reduced under the same current carrying capacity, thereby improving the snow resistance.
[0046] Take the current-carrying line 6 as an example, which is a heat-resistant soft aluminum wire with a conductivity of 63% IACS. As a soft aluminum wire, it has higher conductivity and heat resistance while giving up mechanical strength. Under the same ambient temperature, the transmission line adopts this product with the same aluminum cross-section, compared with the ordinary steel-core aluminum stranded wire, and the transmission capacity can be increased by more than 50% at 100°C. If the same outer diameter of this product is used, compared with the ordinary steel-core aluminum stranded wire, the transmission capacity can be increased by more than 50% at 90°C, and at 120°C, it can reach double capacity transmission. In addition, this product not only has the excellent characteristics of being able to increase the operating temperature during current transmission, but also does not damage its strength, sag and other characteristics. In addition, the conductivity advantage of soft aluminum is very obvious, and the effect of reducing line power loss is more significant. It can be seen that in the capacity expansion and reconstruction of the line construction, the existing transmission channel can be used, the line corridor does not need to be changed, and the original pole tower does not need to be replaced or reinforced. It can fully meet the requirements of line capacity expansion, thereby obtaining better economic benefits.
[0047] The embodiments described above are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.
Claims
1. A gap type cable, characterized in that: It includes a current-carrying conductor and a tensile core. The current-carrying conductor is arranged on the periphery of the tensile core. The current-carrying conductor includes a plurality of concentrically arranged current-carrying layers. The current-carrying layers are formed by twisting a plurality of current-carrying wires. The current-carrying wires have contact surfaces. Adjacent current-carrying wires are attached through at least part of the contact surfaces. Lubricating grease is provided between the current-carrying conductor and the tensile core.
2. A gap-type cable according to claim 1, characterized in that: The cross section of the current-carrying wire is fan-shaped.
3. A gap-type cable according to claim 2, characterized in that: The ring widths corresponding to each current-carrying layer are different.
4. A gap-type cable according to claim 2, characterized in that: The cross section of the current-carrying wire has inner and outer edges for fitting the current-carrying layer or insulating layer of the tensile core and the outer layer, and side edges connected to the current-carrying wires on both sides, and the side edges are arranged along the radial direction of the cable side, or the side edges intersect the radial direction.
5. A gap-type cable according to claim 4, characterized in that: The sides are straight or curved.
6. A gap-type cable according to claim 5, characterized in that: The side edges include contact edges and non-contact edges. The two contact edges adjacent to the two current-carrying lines and the inner edge of the outer current-carrying layer form a damping cavity. When the two current-carrying lines are displaced under vibration, the volume of the damping cavity increases or decreases to absorb the vibration.
7. A gap-type cable according to claim 1, characterized in that: The current-carrying layer comprises an inner current-carrying layer and an outer current-carrying layer, the inner current-carrying layer comprises ten current-carrying wires, and the outer current-carrying layer comprises fifteen current-carrying wires.
8. A gap-type cable according to claim 1, characterized in that: The tensile core includes seven tensile wires, and the tensile core is formed by twisting the tensile wires.
9. A gap-type cable according to claim 1 or 7, characterized in that: The material of the current-carrying wire is aluminum.
10. A gap-type cable according to claim 1 or 8, characterized in that: The material of the tension wire is galvanized steel wire.