A type of overhead power transmission load-bearing profile and a stress-transfer type overhead conductor

Abstract

This utility model relates to the field of power transmission technology, and in particular to a bearing profile for overhead power transmission and a stress-transfer type overhead conductor. The bearing profile for overhead power transmission includes a hollow profile body (21), with several sealing walls (22) spaced apart within the profile body (21). These sealing walls (22) are sealed to the inner wall of the profile body (21), dividing its hollow interior into multiple independent sealed chambers (23). This utility model features a novel structure. By adjusting the air pressure within each sealed chamber, it actively controls the elastic deformation of the profile body, achieving dynamic adjustment of conductor stiffness and optimized distribution of mechanical stress. This significantly improves sag control accuracy, effectively suppresses wind and rain vibration, and greatly enhances the environmental adaptability and operational reliability of the transmission line.

Description

Technical Field

[0001] This utility model relates to the field of power transmission technology, and in particular to a profile for overhead power transmission and a stress-transfer type overhead conductor. Background Technology

[0002] As a core component of the power system, the performance of overhead transmission conductors directly affects the safety, stability, and transmission efficiency of the power grid. Currently, traditional conductors mostly employ solid or multi-strand round wire stranded structures. These structures have revealed several inherent defects during long-term operation, particularly their insufficient adaptability to complex environmental loads. These defects manifest in the following ways: First, under external excitations such as wind loads, ice loads, and temperature changes, they are prone to large-scale vibrations (such as galloping or light wind vibrations) and excessive sag. These problems can not only lead to line faults such as phase-to-phase short circuits and hardware wear, but in severe cases, even major operational accidents such as strand breakage or line breakage.

[0003] Secondly, the stress distribution in traditional conductor structures is often uneven, with significant stress concentration, which prevents the material's mechanical potential from being fully utilized, thus affecting the overall load-bearing capacity and service life of the conductor.

[0004] Therefore, those skilled in the art are dedicated to developing a novel overhead power transmission line with high tensile strength and a stress-transfer type overhead conductor. Utility Model Content

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is to provide a profile for overhead power transmission load bearing and a stress transfer type overhead conductor.

[0006] To achieve the above objectives, this utility model provides a profile for overhead power transmission, comprising a hollow profile body, wherein a plurality of sealing walls are provided at intervals within the profile body, the plurality of sealing walls being sealed to the inner wall of the profile body, and dividing its hollow inner cavity into multiple independent sealed chambers.

[0007] Preferably, guide folds are provided on the webs on both sides of the profile body.

[0008] Preferably, each of the aforementioned sealed chambers is equipped with an air pressure regulating device.

[0009] Preferably, the profile body is made of a flexible metal material and its cross-sectional shape is fan-shaped.

[0010] This utility model also provides a stress-transfer type overhead conductor, including any of the overhead power transmission load-bearing profiles described above.

[0011] Preferably, it also includes a support core, a stress transfer layer is provided outside the support core, a gap conductive layer is provided outside the stress transfer layer, and a main conductive layer is provided outside the gap conductive layer.

[0012] Preferably, the stress transfer layer is formed by twisting together a plurality of overhead power transmission bearing profiles.

[0013] Preferably, the gap conductive layer is formed by twisting together a plurality of conductive wires with gaps.

[0014] Preferably, the stress transfer layer, the gap conductive layer, and the main conductive layer are twisted in opposite directions.

[0015] The beneficial effects of this utility model are: This utility model has a novel structure. By adjusting the air pressure in each sealed chamber, it actively controls the elastic deformation of the conductor body, realizes the dynamic adjustment of conductor stiffness and the optimized distribution of mechanical stress, thereby significantly improving the sag control accuracy, effectively suppressing wind and rain vibration, and greatly enhancing the environmental adaptability and operational reliability of the transmission line. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the overhead power transmission load-bearing profile in a specific embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the assembly of the overhead power transmission load-bearing profile and the sealing wall in a specific embodiment of this utility model.

[0019] 1. Supporting core; 2. Stress transfer layer; 21. Profile body; 22. Sealing wall; 23. Sealing chamber; 24. Connecting hole; 25. Guide pleats; 3. Gap conductive layer; 4. Main conductive layer. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figure 1-2As shown, an overhead power transmission conductor profile includes a hollow conductor body 21. The cross-section of the conductor body 21 is specially designed, preferably fan-shaped or trapezoidal. This irregular cross-section helps optimize its mechanical properties and spatial layout, improving the structural stability and environmental adaptability of the conductor. Specifically, the conductor body 21, as a load-bearing component, is made of flexible metal material (such as special alloy steel). This design endows the conductor body 21 with excellent elastic deformation capacity, allowing it to achieve controllable elastic deformation through internal air pressure adjustment. Furthermore, to further enhance the controllability of deformation and structural reliability of the conductor body 21, precision-machined guide pleats 25 are provided on the main plane of the web plates on both sides of the conductor body 21. These pleats have a sawtooth waveform characteristic, which can guide the conductor body 21 to undergo directional and controllable deflection behavior during stress. Under the synergistic effect of the aforementioned elastic material and guide folds 25, the conductor body 21 can undergo the expected elastic deformation under air pressure regulation, thereby significantly increasing its cross-sectional moment of inertia and ultimately improving the overall bending stiffness of the entire conductor. This mechanism can effectively reduce conductor sag, suppress galloping caused by wind and rain vibration, and significantly improve the environmental adaptability and operational reliability of transmission lines.

[0022] In this embodiment, a plurality of sealing walls 22 are spaced apart inside the profile body 21. These sealing walls 22 are sealed to the inner wall of the profile body 21, dividing its hollow interior into multiple independent sealed chambers 23. Each sealed chamber has a connecting hole 24, within which a pressure regulating device (not shown in the figure, and its specific structure is not the focus of this invention, so it will not be described in detail here) is installed. The pressure regulating device is connected to the sealed chamber 23 through the connecting hole 24. Simultaneously, the pressure regulating device can be controlled by an external control system to achieve pressurization or vacuuming of the sealed chamber interior.

[0023] like Figure 3 As shown, a stress-transfer type overhead conductor includes the overhead power transmission bearing profile described above. In addition, it includes a support core 1, a stress-transfer layer 2 surrounding the support core 1, a gap conductive layer 3 surrounding the stress-transfer layer 2, and a main conductive layer 4 surrounding the gap conductive layer 3. The stress-transfer layer 2 is formed by gap-twisting several of the aforementioned overhead power transmission bearing profiles. The gap conductive layer 3 is formed by gap-twisting several conductive profiles. The stress-transfer layer 2 (2), the gap conductive layer 3, and the main conductive layer 4 are twisted in opposite directions.

[0024] In practice, the external control system first instructs the air pressure regulating device of a specific sealed chamber to perform pressurization or vacuuming. During pressurization, the increased air pressure inside the sealed chamber forces the profile body 21 to open the pre-set guide folds 25, resulting in controllable elastic expansion. This increases the moment of inertia of the cross-section, significantly improving the overall stiffness of the conductor to suppress galloping and reduce sag. During vacuuming, the external atmospheric pressure causes the flanges of the profile body 21 to close downwards. At this time, the guide folds 25 tighten, the moment of inertia of the cross-section decreases, and the stiffness decreases. More mechanical loads (such as tension) are transferred to the outermost, more conductive gap conductive layer 3 or the main conductive layer 4, fully utilizing their mechanical load-bearing potential and achieving intelligent stress transfer from the core to the outer layer, thus optimizing the overall stress distribution.

[0025] This application has a novel structure. By adjusting the air pressure in each sealed chamber, the elastic deformation of the conductor body 21 is actively controlled, thereby achieving dynamic adjustment of conductor stiffness and optimized distribution of mechanical stress. This significantly improves the accuracy of sag control, effectively suppresses wind and rain vibration, and greatly enhances the environmental adaptability and operational reliability of the transmission line.

[0026] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A type of overhead power transmission load-bearing profile, characterized in that: It includes a hollow profile body (21), and a plurality of sealing walls (22) are provided inside the profile body (21) at intervals. The plurality of sealing walls (22) are sealed to the inner wall of the profile body (21) and divide its hollow inner cavity into a plurality of independent sealing chambers (23).

2. The overhead power transmission load-bearing profile as described in claim 1, characterized in that: Guide folds (25) are provided on both sides of the web plate of the profile body (21).

3. The overhead power transmission load-bearing profile as described in claim 1, characterized in that: Each of the sealed chambers (23) is equipped with a pressure regulating device.

4. The overhead power transmission load-bearing profile as described in claim 1, 2, or 3, characterized in that: The profile body (21) is made of flexible metal material and has a fan-shaped cross-section.

5. A stress-transfer type overhead conductor, characterized in that: Includes overhead power transmission load-bearing profiles as described in any one of claims 1-4.

6. The stress-transfer type overhead conductor as described in claim 5, characterized in that: It also includes a support core (1), a stress transfer layer (2) is provided outside the support core (1), a gap conductive layer (3) is provided outside the stress transfer layer (2), and a main conductive layer (4) is provided outside the gap conductive layer (3).

7. The stress-transfer type overhead conductor as described in claim 6, characterized in that: The stress transfer layer (2) is formed by twisting together several overhead power transmission load-bearing profiles.

8. The stress-transfer type overhead conductor as described in claim 6, characterized in that: The gap conductive layer (3) is formed by twisting together several conductive wires with gaps.

9. The stress-transfer type overhead conductor as described in claim 6 or 7, characterized in that: The stress transfer layer (2), the gap conductive layer (3), and the main conductive layer (4) are twisted in opposite directions.

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