A transmission line temperature rise test air collecting vent structure and design method

Abstract

The present invention provides a transmission line temperature rise test air inlet structure and design method, including: determining the shape and size of the single air inlet inlet according to the external dimensions of the flow field source; determining the shape and size of the single air inlet outlet according to the external dimensions of the experimental transmission line; determining the shape and size of the single air inlet wall connecting the single air inlet inlet and outlet according to the shapes and sizes of the single air inlet inlet inlet and outlet; determining the shape and size of the single air inlet component according to the shapes and sizes of the single air inlet inlet, outlet and wall; determining the material type of the single air inlet according to the flow field source wind speed; determining the combination mode of the single air inlet according to the length and direction of the experimental transmission line. The technical solution of the present invention combines multiple single air inlets to form a combined air inlet, which concentrates the wind force of the experimental air field source and outputs a uniform, stable and controllable air flow field, thereby improving the feasibility and accuracy of the temperature rise experiment.

Description

Technical Field

[0001] The present invention relates to the field of transmission line temperature rise test equipment, and in particular to a transmission line temperature rise test air collecting vent structure and a design method. Background Art

[0002] Overhead transmission lines can suffer varying degrees of damage due to factors like aging and corrosion, leading to excessively high local contact resistance during operation and, in turn, abnormal temperature rise. Wind speed and direction over the conductors can significantly influence this temperature rise, causing significant errors in infrared thermal imaging of the conductor's outer surface. This significantly hinders infrared thermal inspections based on this principle. Therefore, it is necessary to conduct temperature-rise experiments on transmission lines in the laboratory to determine their temperature-rise characteristics under different stable air flow fields. To achieve this stable flow field, a wind collector or wind tunnel is required.

[0003] Most existing wind collectors are large instruments with large and fixed dimensions, which are expensive. Some small wind collectors (such as blowers) are limited by power and outlet diameter and cannot be used for transmission line temperature rise tests. During transmission line temperature rise tests, the test lines are mostly ring-shaped, tens of meters long, connected end to end. Large fixed wind collectors or wind tunnels make it difficult to accurately control the wind conditions of each part of the conductor. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a transmission line temperature rise test air collection outlet structure and design method. The design method is applied to design a single air collection outlet, and multiple single air collection outlets are combined according to the direction of the experimental transmission line to form a combined air collection outlet. The wind force of the experimental air field source is concentrated through the combined air collection outlet, and a uniform, stable and controllable air flow field is output.

[0005] The present invention provides a method for designing an air collecting vent for a temperature rise test of a transmission line, the specific steps of which include:

[0006] Determine the shape and size of the single air outlet inlet surface according to the external dimensions of the flow field source;

[0007] Determine the shape and size of the single air outlet outlet according to the external dimensions of the experimental transmission line;

[0008] Determine the shape and size of the single-collection tuyere wall surface according to the shape and size of the single-collection tuyere inlet surface and the single-collection tuyere outlet surface, wherein the single-collection tuyere wall surface connects the single-collection tuyere inlet surface and the single-collection tuyere outlet surface;

[0009] Determine the shape and size of the components constituting the single air outlet according to the shape and size of the inlet surface, outlet surface and wall surface of the single air outlet;

[0010] Determining the material type of the single air outlet according to the wind speed of the flow field source;

[0011] The combination mode of the single-set air outlets is determined according to the length and direction of the experimental transmission line.

[0012] Preferably, the inlet surface of the single air collection port is not smaller than and covers the air outlet of the flow field source.

[0013] Preferably, the outlet surface of the single air outlet is rectangular;

[0014] The height of the outlet surface of the single air collection port is greater than twice the diameter of the experimental transmission line.

[0015] Preferably, the wall surface of the single air collection port is connected to the inlet surface of the single air collection port and the outlet surface of the single air collection port to form an enclosure;

[0016] On the enclosure, a plane passing through the respective central axes of symmetry of the single air collection port inlet surface and the single air collection port outlet surface is perpendicular to the single air collection port inlet surface and the single air collection port outlet surface.

[0017] Preferably, the single air outlet component comprises: a wall panel, a wall connector, and an air filter;

[0018] After the wall panel is fixedly connected to the wall connector, the single air outlet wall is formed;

[0019] The air filter is located at the outlet surface of the single air outlet and is fixedly connected to the wall panel and the wall connector;

[0020] The area of ​​the air filter is not less than the area of ​​the outlet surface of the single air outlet.

[0021] Further preferably, the air filter is at least one layer;

[0022] The mesh area of ​​the air filter is not greater than 4mm 2 .

[0023] Preferably, the wall surface of the single air collection port is a wooden board, a metal board or a polymer material board.

[0024] Preferably, a plurality of single air collection vents are spliced ​​and extended in a single row or spliced ​​and erected side by side along the length of the experimental power transmission line.

[0025] Another object of the present invention is to provide a combined air collecting outlet structure designed using the above-mentioned air collecting outlet design method for a transmission line temperature rise test, comprising: a first air collecting outlet, a second air collecting outlet, and a third air collecting outlet;

[0026] The shapes and sizes of the inlet and outlet surfaces of the first, second and third air collecting ports are respectively the same;

[0027] The first air collecting port, the second air collecting port and the third air collecting port are combined by splicing and extending;

[0028] The first air collecting port is located at one end of the combined air collecting port, the second air collecting port is located at the other end of the combined air collecting port, and the third air collecting port is located in the middle of the combined air collecting port.

[0029] Furthermore, the first air collecting port, the second air collecting port and the third air collecting port each include a wall flat plate, a wall connecting piece and an air filter;

[0030] The wall plate includes an upper wall plate, a lower wall plate and a side wall plate;

[0031] The upper wall flat plate and the lower wall flat plate have the same shape and size;

[0032] The wall connectors of the first air collecting vent and the second air collecting vent both include right-angle connectors and combined connectors;

[0033] The wall connection piece of the third air collecting vent is a combined connection piece;

[0034] The upper wall flat plate and the lower wall flat plate are connected to the side wall flat plate through the right-angle connector at the end of the combined air collecting port, and are connected to the side wall flat plate through the combined connector in the middle of the combined air collecting port;

[0035] The air filter covers the outlet surfaces of the first air collecting port, the second air collecting port and the third air collecting port, and is fixedly connected to the wall connectors of the first air collecting port, the second air collecting port and the third air collecting port.

[0036] It can be seen from the above technical solutions that the present invention has the following advantages:

[0037] The present invention provides a structure and design method for an air collecting vent for a temperature rise test of a transmission line. A single air collecting vent is designed using the design method described in the technical solution of the present invention. A plurality of single air collecting vents are combined according to the direction of the experimental transmission line to form a combined air collecting vent, thereby reducing the external dimensions and production cost of the air collecting vent device and improving the flexible applicability of the air collecting vent to the requirements of different experimental transmission lines. The wind force of the experimental air field source is concentrated through the combined air collecting vent, and a uniform, stable and controllable air flow field is output, thereby reducing air energy loss and improving the feasibility and accuracy of the temperature rise test, thereby providing convenience for infrared thermal imaging inspection of transmission lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic flow chart of a method for designing an air collecting outlet for a temperature rise test on a transmission line provided in a specific embodiment of the present invention;

[0040] Figure 2 A structural diagram of a single air vent designed using the air vent design method for a transmission line temperature rise test provided in a specific embodiment of the present invention;

[0041] Figure 3 A structural diagram of a combined air collector designed using the air collector design method for a transmission line temperature rise test provided in a specific embodiment of the present invention;

[0042] Figure 4 A structural diagram of the upper and lower wall surfaces of a combined air collector structure designed using the air collector design method for a transmission line temperature rise test provided in a specific embodiment of the present invention;

[0043] Figure 5 A side wall flat plate structure diagram of a combined air collector structure designed using the air collector design method for a transmission line temperature rise experiment provided in a specific embodiment of the present invention;

[0044] Figure 6 A structural diagram of a right-angle connector and a combined connector of a combined air collector structure designed using the transmission line temperature rise test air collector design method provided in a specific embodiment of the present invention;

[0045] Figure 7 A schematic diagram of an air filter net of a combined air collector structure designed using the air collector design method for a transmission line temperature rise experiment is provided in a specific embodiment of the present invention.

[0046] The accompanying drawings are marked as: first air collecting outlet 1, second air collecting outlet 2, third air collecting outlet 3, wall flat plate 4, upper wall flat plate 41, lower wall flat plate 42, side wall flat plate 43, wall connector 5, right-angle connector 51, combined connector 52, and air filter 6. DETAILED DESCRIPTION

[0047] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0048] In the description of this application, it should be noted that the terms "upper", "lower", "side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0049] Unless otherwise specified or limited, the terms "connect" and "fixed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0050] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features, unless otherwise specifically specified.

[0051] A method for designing an air collecting outlet for a transmission line temperature rise test according to an embodiment of the present invention comprises the following steps:

[0052] S11. Determine the shape and size of the inlet surface of the single air outlet according to the external dimensions of the flow field source;

[0053] S12. Determine the shape and size of the outlet surface of a single air vent based on the external dimensions of the experimental transmission line;

[0054] S13. Determine the shape and size of a wall surface of the single-collection tuyere according to the shapes and sizes of the single-collection tuyere inlet surface and the single-collection tuyere outlet surface, wherein the wall surface of the single-collection tuyere connects the single-collection tuyere inlet surface and the single-collection tuyere outlet surface;

[0055] S14, determining the shape and size of the components constituting the single air outlet according to the shape and size of the inlet surface, outlet surface, and wall surface of the single air outlet;

[0056] S15. Determine the material type of the single air outlet according to the wind speed of the flow field source;

[0057] S16. Determine the combination of the single-set air outlets according to the length and direction of the experimental transmission line.

[0058] Furthermore, in step S11, the inlet surface of the single air outlet is not smaller than and covers the air outlet of the flow field source to ensure that the single air outlet can effectively concentrate the air flow field source and reduce air energy loss. For example, if the field source is a vertical fan with a diameter of 500 mm, its inlet surface is a square of 500 mm × 500 mm.

[0059] Furthermore, in step S12, the outlet surface of the single air outlet is rectangular, and the height of the outlet surface of the single air outlet is greater than 2 times the diameter of the experimental transmission line to ensure that all parts of the line within the cross-sectional area of ​​the experimental transmission line are affected by the flow field. For example, if the experimental transmission line is a steel-core aluminum stranded wire with a cross-section of 240mm2, the outlet surface is a rectangle of 500mm×100mm.

[0060] Furthermore, in step S13, after the wall surface of the single air outlet is connected to the inlet surface of the single air outlet and the outlet surface of the single air outlet, an enclosure is formed for allowing air to enter and exit in a single manner, which is the structural appearance of the single air outlet. The structural form of the enclosure ensures that the single air outlet has the function of compressing the airflow.

[0061] The structural shape of the single-collection air outlet is appropriately adjusted according to the experimental wind speed requirements, the field source type (such as wind turbine, fan, wind tunnel, etc.), the experimental site conditions and the conductor model. Among them, reducing the outlet surface area of ​​the single-collection air outlet can increase the outlet flow rate, but it cannot be made less than twice the diameter of the experimental transmission line, which will affect the experimental effect when the wind field sweeps the transmission line outside the transmission line; reducing the distance between the inlet surface and the outlet surface of the single-collection air outlet can increase the wind speed of the air flowing out of the outlet surface of the single-collection air outlet while saving the experimental site; modifying the shape of the inlet surface of the single-collection air outlet to make it more compatible with the field source shape of the flow field, such as setting the inlet surface of the single-collection air outlet to a circle that matches the rotating fan, and correspondingly modifying the cross-section of the wall surface of the single-collection air outlet to an elliptical shape can reduce wind resistance, increase the flow rate of the air flowing out of the outlet surface of the single-collection air outlet and reduce material usage.

[0062] On the enclosure, the plane passing through the respective central axes of symmetry of the single air outlet inlet surface and the single air outlet outlet surface is perpendicular to the single air outlet inlet surface and the single air outlet outlet surface. At this time, the single air outlet inlet surface is parallel to the single air outlet outlet surface, and the parallel spacing between them is determined according to the experimental wind speed requirements and the experimental site conditions, for example, 750 mm.

[0063] Furthermore, the single air vent component comprises: a wall panel, a wall connector, and an air filter;

[0064] The wall panels and the wall connectors are fixed with bolts or glued together to form the single air outlet wall. To adapt to the direction of the experimental power transmission line, the wall panels can be rectangular or trapezoidal, and can be fan-shaped at the line corners.

[0065] The air filter is located on the outlet surface of the single air collection port and is fixedly connected to the wall panel and the wall connection piece. Specifically, rivets or adhesive can be used to fix the air filter to the wall panel and the wall connection piece.

[0066] The area of ​​the air filter is not less than the area of ​​the outlet surface of the single air outlet.

[0067] Furthermore, the air filter is at least one layer, and increasing the number of air filter layers will reduce the wind speed of the air flowing out of the outlet surface of the single air collection port;

[0068] The mesh area of ​​the air filter is not greater than 4mm 2 When the mesh is square, its side length should not be greater than 2mm.

[0069] Furthermore, the wall surface of the single air outlet is a wooden board, a metal board or a polymer material board, which can be understood here as selecting a hard material that can withstand the wind speed of the flow field source and stabilize the structure of the single air outlet to ensure that the single air outlet structure does not deform or vibrate during the experiment.

[0070] like Figure 2 As shown, a single air vent designed using the air vent design method for a transmission line temperature rise experiment is provided in an embodiment of the present invention.

[0071] like Figure 3-7 As shown, another object of the present invention is to provide a combined air collecting outlet structure designed using the air collecting outlet design method for a transmission line temperature rise experiment, comprising: a first air collecting outlet 1, a second air collecting outlet 2, and a third air collecting outlet 3;

[0072] The shapes and sizes of the inlet and outlet surfaces of the first air collecting port 1, the second air collecting port 2 and the third air collecting port 3 are respectively the same;

[0073] The first air collection outlet 1, the second air collection outlet 2 and the third air collection outlet 3 are combined by splicing and extending;

[0074] The first air collecting port 1 is located at one end of the combined air collecting port, the second air collecting port 2 is located at the other end of the combined air collecting port, and the third air collecting port 3 is located in the middle of the combined air collecting port.

[0075] Furthermore, the first air collecting port 1, the second air collecting port 2 and the third air collecting port 3 each include a wall plate 4, a wall connector 5 and an air filter 6;

[0076] like Figure 4-5 As shown, the wall plate 4 includes an upper wall plate 41, a lower wall plate 42 and a side wall plate 43;

[0077] The upper wall plate 41 and the lower wall plate 42 have the same shape and size;

[0078] like Figure 6 As shown, the wall connectors 5 of the first air collecting port 1 and the second air collecting port 2 both include a right-angle connector 51 and a combined connector 52;

[0079] The wall connection piece 5 of the third air collecting vent 3 is a combined connection piece 52;

[0080] The upper wall flat plate 41 and the lower wall flat plate 42 are connected to the side wall flat plate 43 at the end of the combined air collecting port through a right-angle connector 51, and are connected to the side wall flat plate 43 at the middle of the combined air collecting port through a combined connector 52;

[0081] The air filter 6 covers the outlet surfaces of the first air collecting port 1 , the second air collecting port 2 and the third air collecting port 3 , and is fixedly connected to the wall connectors 5 of the first air collecting port 1 , the second air collecting port 2 and the third air collecting port 3 .

[0082] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing an air collection outlet for a transmission line temperature rise test, characterized in that: The specific steps include: Determine the shape and size of the single air outlet inlet surface according to the external dimensions of the flow field source; Determine the shape and size of the single air outlet outlet according to the external dimensions of the experimental transmission line; Determine the shape and size of the single-collection tuyere wall surface according to the shape and size of the single-collection tuyere inlet surface and the single-collection tuyere outlet surface, wherein the single-collection tuyere wall surface connects the single-collection tuyere inlet surface and the single-collection tuyere outlet surface; Determine the shape and size of the components constituting the single air outlet according to the shape and size of the inlet surface, outlet surface and wall surface of the single air outlet; Determining the material type of the single air outlet according to the wind speed of the flow field source; Determining the combination of the single-set air outlets according to the length and direction of the experimental transmission line; Determining the shape and size of the inlet surface of the single air outlet according to the external dimensions of the flow field source specifically includes: The inlet surface of the single air collection port is not smaller than and covers the air outlet of the flow field source.

2. The method for designing an air collection outlet for a transmission line temperature rise test according to claim 1, characterized in that: Determining the shape and size of the outlet surface of a single air outlet based on the external dimensions of the experimental transmission line specifically includes: The outlet surface of the single air outlet is rectangular; The height of the outlet surface of the single air collection port is greater than twice the diameter of the experimental transmission line.

3. The method for designing an air collection outlet for a transmission line temperature rise test according to claim 1, characterized in that: The single air outlet wall surface connects the single air outlet inlet surface and the single air outlet outlet surface, specifically including: The wall surface of the single air collection port is connected to the inlet surface of the single air collection port and the outlet surface of the single air collection port to form an enclosure; On the enclosure, a plane passing through the respective central axes of symmetry of the single air collection port inlet surface and the single air collection port outlet surface is perpendicular to the single air collection port inlet surface and the single air collection port outlet surface.

4. The method for designing an air collection outlet for a transmission line temperature rise test according to claim 1, characterized in that: The single air vent components include: a wall panel, a wall connector, and an air filter; After the wall panel is fixedly connected to the wall connector, the single air outlet wall is formed; The air filter is located at the outlet surface of the single air outlet and is fixedly connected to the wall panel and the wall connector; The area of ​​the air filter is not less than the area of ​​the outlet surface of the single air outlet.

5. The method for designing an air collection outlet for a transmission line temperature rise test according to claim 4, characterized in that: The air filter is at least one layer; The mesh area of ​​the air filter is not greater than 4mm 2 .

6. The method for designing an air collection outlet for a transmission line temperature rise test according to claim 1, characterized in that: The material of the single tuyere is specifically: The wall surface of the single air outlet is a wooden board, a metal board or a polymer material board.

7. The method for designing an air collection outlet for a transmission line temperature rise test according to claim 1, characterized in that: The combination method of the single-set air vents includes: splicing and extending multiple single-set air vents in a single row or splicing and erecting them side by side along the length of the experimental transmission line.

8. A combined air collecting outlet structure designed using the air collecting outlet design method for a transmission line temperature rise test according to any one of claims 1 to 7, characterized in that: include: The first episode, the second episode, and the third episode; The shapes and sizes of the inlet and outlet surfaces of the first, second and third air collecting ports are respectively the same; The first air collecting port, the second air collecting port and the third air collecting port are combined by splicing and extending; The first air collecting port is located at one end of the combined air collecting port, the second air collecting port is located at the other end of the combined air collecting port, and the third air collecting port is located in the middle of the combined air collecting port.

9. The combined air collecting vent structure designed using the air collecting vent design method for a transmission line temperature rise experiment according to claim 8, characterized in that: The first air collecting port, the second air collecting port and the third air collecting port all include a wall plate, a wall connecting piece and an air filter; The wall plate includes an upper wall plate, a lower wall plate and a side wall plate; The upper wall flat plate and the lower wall flat plate have the same shape and size; The wall connectors of the first air collecting vent and the second air collecting vent both include right-angle connectors and combined connectors; The wall connection piece of the third air collecting vent is a combined connection piece; The upper wall flat plate and the lower wall flat plate are connected to the side wall flat plate at the end of the combined air collecting port through the right-angle connector, and are connected to the side wall flat plate at the middle of the combined air collecting port through the combined connector; The air filter covers the outlet surfaces of the first air collecting port, the second air collecting port and the third air collecting port, and is fixedly connected to the wall connectors of the first air collecting port, the second air collecting port and the third air collecting port.

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