Galloping test method and system for overhead transmission line

Abstract

The invention provides a galloping test method and system for an overhead transmission line. The system comprises a first tower, a second tower and a third tower which are installed in a flat and wide land parcel. A plurality of wires are arranged between the first tower and the second tower and between the first tower and the third tower. The second tower frame or the third tower frame is arranged on the preset track, and the second tower frame or the third tower frame can move along the preset track. According to the invention, the movable tower and diversified wire arrangement schemes are ingeniously designed on a flat and wide land parcel where uniform and stable horizontal wind of 5-15 m / S is easy to form, so that the span of the test wire and the included angle between the test wire and the prevailing wind direction can be flexibly adjusted, and various complex wire galloping working conditions are formed in a natural wind field. According to the design, the flexibility of the test and the use efficiency of land parcels are remarkably improved, and intuitive comparative research on the galloping states and the anti-galloping effect of the wires with different parameters can be realized under the same wind condition at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of galloping research of overhead transmission lines, and in particular to a galloping test method and system for overhead transmission lines. Background Art

[0002] With the frequent occurrence of extreme weather conditions in recent years, conductor galloping of overhead transmission lines has become one of the major faults threatening the safe operation of these lines. This long-standing and challenging issue has garnered considerable attention from the power grid. Over the past decades, galloping research has yielded fruitful results, including the development of galloping mechanisms, anti-galloping products, standards, and the establishment of galloping test bases. Galloping prevention has now been formally incorporated into overhead line design and infrastructure. Although there are many types of anti-dancing products and they have been widely used, to this day, dancing failures are still difficult to eliminate, and the development of anti-dancing technology has stagnated to a certain extent. The unavoidable reason is that the on-site ice and wind conditions in different periods and sections are extremely random, and the occurrence of dancing on the running lines is also random. For various reasons, the application of existing online monitoring technology in line dancing observation is not ideal. Therefore, the dancing of the running lines is rarely captured in time, and it is even more difficult to obtain complete information on the dancing amplitude, dancing order, dancing frequency and related meteorological and environmental conditions. The application effect of anti-dancing measures and products can only be indirectly proved by rough or even extremely imprecise tripping statistics after installation. This has become a bottleneck for accurately judging the application effect of various anti-dancing products and a major obstacle to the improvement and enhancement of anti-dancing technology.

[0003] Take the anti-dancing wire clamp and rotary spacer as an example: although the product is used in huge quantities, there is no empirical evidence to capture the effect of its on-site application; even the Jianshan real-type dancing test base, which has made great contributions, is located in a mountainous area with complex terrain, resulting in large differences in the inter-gear and inter-alternating ice and wind conditions of the dancing test segments. It is difficult for various products to achieve intuitive comparison, verification and evaluation of the anti-dancing effect. That is, the anti-dancing effect has to some extent stopped at theoretical analysis, and product improvements generally lack rigorous intuitive operational effect support.

[0004] To further investigate conductor galloping and verify the effectiveness of anti-galloping devices, the industry has conducted experimental studies. For example, a full-scale galloping test line segment, identical in size to the actual conductor, is constructed and subjected to galloping tests using D-type simulated ice coverage. Alternatively, wind tunnel tests are conducted. However, full-scale galloping test lines, such as those at the Jianshan Galloping Test Base, struggle to directly compare, verify, and evaluate conductors with different anti-galloping configurations under identical icy and wind conditions. Wind tunnel galloping studies often utilize partial line segments or scaled-down models due to the substantial size of overhead lines. For slender, flexible conductors, scaling down can make it difficult to fully simulate the mechanical and aerodynamic properties of actual conductors. Computer simulation is also a research tool, but the accuracy of the results is highly dependent on the comprehensiveness and accuracy of the on-site galloping conditions. Therefore, the results still need to be verified using actual lines.

[0005] Therefore, there is an urgent need for a test method and system that can overcome the defects of existing technologies and realize intuitive comparison and effective evaluation of the galloping state and anti-galloping effect of overhead transmission lines. Summary of the Invention

[0006] In view of this, the present application provides a galloping test method and system for an overhead transmission line to solve at least one of the above-mentioned problems.

[0007] In order to achieve the above objectives, this application adopts the following scheme:

[0008] According to a first aspect of the present application, a dancing test system for an overhead transmission line is provided, the device comprising: a first tower, a second tower and a third tower installed on a flat, open plot of land, where a uniform and stable horizontal wind of 5 to 15 m / S is easily formed; a plurality of conductors are arranged between the first tower and the second tower, and between the first tower and the third tower; the second tower or the third tower is arranged on a preset track, and the second tower or the third tower can move along the preset track.

[0009] As an embodiment of the present application, a plurality of wire hanging points with different heights, different spacings and different angles are provided on the first tower, the second tower and the third tower.

[0010] As an embodiment of the present application, the above-mentioned wire is one or more of a single wire, a two-split wire, a three-split wire, a four-split wire, a six-split wire or an eight-split wire.

[0011] As an embodiment of the present application, the conductor between the first tower and the second tower forms an angle of 90° with the dominant wind direction of the land parcel.

[0012] As an embodiment of the present application, the tension of the above-mentioned wire can be adjusted.

[0013] As an embodiment of the present application, the ice covering the above-mentioned conductor is naturally formed ice, or artificially simulated ice with various parameters.

[0014] As an embodiment of the present application, the above-mentioned wire is a charged or uncharged wire.

[0015] As an embodiment of the present application, the preset track includes a first preset track provided on a line connecting the first tower and the second tower, and the second tower can move along the first preset track.

[0016] As an embodiment of the present application, the preset track includes a second preset track arranged between the second tower and the third tower, the second preset track is an arc-shaped track, and the third tower can move along the second preset track.

[0017] As an embodiment of the present application, the above-mentioned wires are installed with anti-dancing devices of different types or specifications.

[0018] As an embodiment of the present application, the above system further includes a monitoring device for monitoring the galloping state of the wire.

[0019] As an embodiment of the present application, the above-mentioned monitoring device includes a displacement sensor, an acceleration sensor or an image acquisition device.

[0020] According to a second aspect of the present application, a dancing test method for an overhead transmission line is provided. The method is implemented based on the dancing test system as described above, and the method includes: using the dancing test system to observe, record and intuitively compare the dancing state of the conductor under different working conditions or the anti-dancing effect of the anti-dancing device.

[0021] The galloping test method and system for overhead transmission lines proposed in this application, by cleverly designing a movable tower and a variety of conductor layout schemes on a flat, open plot that is prone to forming uniform and stable horizontal winds of 5 to 15 m / s, can flexibly adjust the span of the test conductor and the angle with the dominant wind direction, thereby forming a variety of complex conductor galloping conditions in a natural wind field. This design not only significantly improves the flexibility of the test and the efficiency of the plot, but also can use the uniformity and stability of the wind conditions of the plot to realize the intuitive comparative study of the conductor galloping state and anti-galloping effect of different parameters (such as conductor model, number of splits, type of icing, whether anti-galloping devices are installed, etc.) under the same wind excitation conditions at the same time, providing a reliable, efficient and economical test platform for the anti-galloping design of transmission lines, the effectiveness evaluation of anti-galloping measures, and the in-depth analysis of the galloping mechanism, thereby improving the pertinence and practicality of the research. In addition, the design of the preset track in this application can reduce the occupancy of the test plot on the basis of meeting the galloping test, reducing the construction cost of the galloping test system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 This is a structural diagram of a dancing test system for an overhead transmission line provided in an embodiment of the present application;

[0024] Figure 2 This is a structural diagram of a dancing test system for an overhead transmission line provided by another embodiment of the present application;

[0025] Figure 3 It is a flow chart of a dancing test method for an overhead transmission line provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application are further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application.

[0027] like Figure 1The figure shows a schematic structural diagram of a dancing test system for an overhead transmission line provided in an embodiment of the present application. The dancing test system includes: a first tower 10, a second tower 20, and a third tower 30, wherein the first tower 10, the second tower 20, and the third tower 30 are installed on a flat, open plot of land that is prone to forming a uniform, stable horizontal wind of 5 to 15 m / s. The selection of the plot is very important for the accuracy and authenticity of the test. In this embodiment, since it is easy to form a uniform, consistent, and stable horizontal wind with a wind speed in the range of 5 to 15 m / s throughout the entire plot area, this is a wind speed condition that is more prone to dancing, providing ideal environmental conditions for simulating the actual stress conditions of conductors with different parameters of overhead transmission lines under the same natural wind conditions.

[0028] A plurality of first conductive lines 50 are installed between the first tower 10 and the second tower 20 , and a plurality of second conductive lines 40 are installed between the first tower 10 and the third tower 30 .

[0029] In this embodiment, the number and type of the first conductive wires 50 and the second conductive wires 40 are not limited, so this embodiment allows parallel testing of conductive wires with different parameters or types.

[0030] The second tower 20 or the third tower 30 is disposed on a preset track, and the second tower 20 or the third tower 30 can move along the preset track.

[0031] Specifically, at least one of the second tower 20 or the third tower 30 is designed to be installed on a preset track. This means that the designated tower (the second tower 20 or the third tower 30) can move along this preset track.

[0032] This movable design gives the test device great flexibility and diverse testing capabilities:

[0033] By moving the second tower 20 (relative to the first tower 10) or the third tower 30 (relative to the first tower 10), the suspension span of the first conductor 50 or the second conductor 40 can be easily changed. Studying the effect of different spans on the galloping characteristics of conductors is an important aspect of galloping testing.

[0034] If the pre-set track allows, the mobile tower can change the angle of the wire suspended between it and the first tower 10 relative to the prevailing wind direction of the plot. This allows simulation of wire dancing at different wind attack angles, for example, enabling angle adjustment within a range of 0° to 90°, which is crucial for a comprehensive understanding of wind-induced dancing mechanisms.

[0035] Because the device can simultaneously set up two sets of conductors (first conductor 50 and second conductor 40), and the parameters of at least one set of conductors (span, angle with wind direction) can be adjusted by moving the tower, it is very convenient for comparative studies. For example, it is possible to compare the galloping behavior of different types of conductors, conductors equipped with different types of anti-galloping devices, or conductors with different tensions or icing conditions under the same or different wind conditions. The "different wind conditions" mentioned above only refer to the difference in the angle between the conductors and the wind direction.

[0036] The overhead transmission line dancing test system proposed in this application, through the clever design of movable towers and diversified conductor layout schemes, can flexibly adjust the span of the test conductor and the angle with the dominant wind direction, thereby simulating a variety of complex actual working conditions in a real natural wind field. This design not only significantly improves the flexibility of the test and the efficiency of the use of the plot, but also can use the uniformity and stability of the wind conditions of the plot to achieve intuitive comparative studies of the conductor dancing state and anti-dancing effect of different parameters (such as conductor model, number of splits, ice type, whether anti-dancing device is installed, etc.) under the excitation conditions of the same wind at the same time. It provides a reliable, efficient and economical test platform for the anti-dancing design of transmission lines, the effectiveness evaluation of anti-dancing measures and the in-depth analysis of the dancing mechanism, thereby improving the pertinence and practicality of the research. In addition, the design of the preset track in this application can reduce the occupancy of the test plot and reduce the test cost on the basis of meeting the dancing test.

[0037] In one embodiment of the present application, a plurality of wire hanging points with different heights, different intervals and different angles are provided on the first tower 10 , the second tower 20 and the third tower 30 .

[0038] Multiple conductor suspension points allow testers to suspend the conductor at different vertical positions. This allows for direct comparison of conductor dancing behavior under identical wind conditions when the conductor is suspended at different heights (which vary with height above the ground and wind speed).

[0039] Multiple conductor suspension points on the tower allow for different horizontal spacings for suspending conductors. This allows for varying the fixed conductor spacing to study the effects of varying conductor spacing on aerodynamic characteristics and galloping stability. For multiple lines or test conductor groups installed on the same tower, this allows for adjusting the horizontal distances between different conductor groups to investigate aerodynamic interference, or allows for the parallel arrangement of multiple test lines within a limited space.

[0040] Multiple conductor suspension points mean the suspension points themselves allow the conductor to be led out at different initial azimuths or at different angles relative to the tower structure. For example, the tower arm can have multiple options for extending in different directions, or the suspension hardware itself can support certain angle adjustments. This allows simulation of conductors in different orientations (relative to the prevailing wind direction or terrain characteristics) or the study of the effects of specific installation angles on local wind resistance and conductor dancing. This enables the test device to better simulate line sections with complex terrain or near special corner towers.

[0041] As can be seen above, by providing these diverse fixed suspension point options, testers can easily and systematically change a single variable (such as just the suspension height or just the spacing) while keeping other test conditions (such as wind speed, direction, and conductor type) as consistent or controllable as possible. This allows differences in conductor galloping behavior under different configurations to be more clearly attributed to the parameter being changed, enabling intuitive comparisons and making research conclusions more clear and reliable.

[0042] In one embodiment of the present application, the first wire 50 and the second wire 40 can be one or more of a single wire, a two-split wire, a three-split wire, a four-split wire, a six-split wire or an eight-split wire, and can also be wires of different materials and sizes, so as to intuitively compare the dancing states of wires with different configurations.

[0043] The conductors of this embodiment can be split into different numbers. Due to their unique aerodynamic properties (such as the wake effect between the sub-conductors and different torsional stiffness), the dancing characteristics of split conductors differ significantly from those of single conductors. Furthermore, conductors with different numbers of split conductors exhibit different dancing patterns and susceptibility. By testing conductors with different numbers of split conductors, their dancing behaviors under the same or similar wind conditions can be directly compared, such as dancing amplitude, frequency, starting wind speed, and dancing morphology.

[0044] The material of a conductor directly affects its mass per unit length, stiffness, damping characteristics, and surface roughness. For example, the galloping characteristics of traditional aluminum-steel-core stranded conductor (ACSR), all-aluminum-alloy stranded conductor (AAAC), or conductors made of novel materials (such as carbon fiber composite core conductors) can differ significantly. By testing conductors of different materials, it is possible to evaluate the galloping resistance of new conductors or study the impact of specific materials on galloping susceptibility.

[0045] Conductor size is a key factor influencing its aerodynamic parameters, and also affects its mass and stiffness. Conductors of different diameters experience different airflow patterns at the same wind speed, resulting in different galloping characteristics. Comparing the galloping behavior of conductors of different sizes helps understand the impact of conductor diameter on galloping and provides a basis for selecting appropriate conductors for specific voltage levels and transmission capacities.

[0046] Combining this diversity of conductor types with the aforementioned features such as movable towers (to adjust span and wind attack angle) and multiple suspension points (to adjust sag and installation angle), the galloping test system can very comprehensively and systematically simulate and study the impact of various factors on the galloping of overhead transmission lines, providing a powerful test platform for in-depth understanding of the galloping mechanism and the formulation of effective anti-galloping strategies.

[0047] In one embodiment of the present application, Figure 1 As shown, the conductors between the first tower 10 and the second tower 20 form a 90° angle with the prevailing wind direction of the plot. To visually compare the dancing state of multiple conductors suspended in parallel between the first tower 10 and the second tower 20 under the same wind direction conditions of the vertical conductors. The wind direction perpendicular to the axis of the conductor is one of the typical and dangerous working conditions that trigger the galloping of the conductor. Under such conditions, the aerodynamic force on the surface of the conductor changes most significantly, and it is easier to reach the starting conditions for galloping. When multiple first conductors 50 are suspended in parallel between the first tower 10 and the second tower 20, and they are all in a state perpendicular to the prevailing wind direction (90°), it can be considered that these parallel conductors basically experience the same direction and similar intensity wind field environment. This eliminates the complex factors that cause different stress conditions of each conductor due to different wind directions.

[0048] Therefore, if different configurations are used on these parallel conductors (for example, different conductor models, different numbers of splits, different icing simulations, different types of anti-dancing devices installed, or different initial tensions / sags, etc.), then the differences in their dancing states (such as dancing wind speed, dancing amplitude, dancing frequency, dancing trajectory morphology, etc.) can be more directly and intuitively attributed to the different configurations of these conductors themselves.

[0049] This setup greatly improves the effectiveness of comparative tests and the reliability of conclusions. Researchers can clearly observe which conductor configuration is more prone to galloping under the exact same vertical wind, which anti-galloping measures are more effective, or which conductor parameters have a greater impact on galloping.

[0050] In one embodiment of the present application, the preset track includes a first preset track provided on the line connecting the first tower 10 and the second tower 20, and the second tower 20 can move along the first preset track. Since the first preset track is located on the line connecting the first tower 10 and the second tower 20, when the second tower 20 moves along the track, it will directly approach or move away from the first tower 10. For details, please refer to Figure 2 This will result in a change in the span of the first conductor 50 suspended between the first tower 10 and the second tower 20 .

[0051] The conductor span (i.e., span) is one of the key parameters affecting its galloping behavior. Different spans can cause changes in the conductor's natural frequency, tension distribution (assuming sag control), and overall response to wind. By being able to easily adjust the span of the first conductor 50, researchers can systematically study the conductor's galloping wind speed, galloping amplitude, galloping stability, and galloping morphology under different spans; verify the impact of span parameters on galloping in theoretical models; and provide a basis for selecting appropriate anti-galloping measures for actual lines of different spans.

[0052] Combined with the aforementioned arrangement of "a 90° angle between the conductors between the first and second towers 10, 20 and the prevailing wind direction," this movable second tower 20 allows researchers to change the conductor span while ensuring the wind direction remains perpendicular to the conductors. This is valuable for gaining a deeper understanding of how span changes affect the galloping characteristics in vertical wind conditions, where galloping is most likely to occur.

[0053] In short, the first pre-set track is set on the line connecting the first tower 10 and the second tower 20, and the second tower 20 is allowed to move along it. The core purpose is to conveniently and accurately change and study the impact of the span of the first set of test conductors on the galloping characteristics of the transmission line. This is a very important variable parameter in galloping testing, and this design makes it more convenient and systematic to study this parameter.

[0054] Similarly, the third tower 30 can also move in the track on the line connecting it to the first tower 10, so that the span of the second conductor 40 can be changed. For details, please refer to Figure 2 shown.

[0055] In one embodiment of the present application, Figure 1 As shown, the preset track includes a second preset track disposed between the second tower 20 and the third tower 30. This second preset track is a circular track, along which the third tower 30 can move. As the third tower 30 moves, the wire suspended between the first tower 10 and the third tower 30 can form an angle of 0° to 90° with the prevailing wind direction of the plot.

[0056] The second preset track is a circular track with the first tower 10 as its center. When the third tower 30 moves along this circular track, it changes its position relative to the first tower 10. Therefore, the overall direction or axis direction of the second conductor 40 suspended between the first tower 10 and the third tower 30 will change, and the angle between it and the prevailing wind direction of the plot (i.e., the wind attack angle) will change. Specifically, the design allows this angle to cover a range from 0° to 90°. An angle of 0° means that the wind direction is parallel to the conductor axis, an angle of 90° means that the wind direction is perpendicular to the conductor axis, and intermediate values ​​represent various oblique wind conditions.

[0057] In this way, the present embodiment can intuitively compare the dancing state of the wire (first wire 50) suspended between the first tower 10 and the second tower 20 with the wire (second wire 40) suspended between the first tower 10 and the third tower 30: According to the aforementioned embodiment, the first wire 50 between the first tower 10 and the second tower 20 is usually set at a 90° angle to the prevailing wind direction, as a reference group, representing the dancing state under a vertical wind attack angle. By moving the third tower 30, the angle between the second wire 40 and the prevailing wind direction can be continuously or discretely changed between 0° and 90°. Under the same other conditions (for example, if the two groups of wire models, icing conditions, tension, etc. are the same or known), researchers can simultaneously observe or separately record the dancing state of the second wire 40 at different wind attack angles (specific angles within the range of 0°-90°) and compare it with the dancing state of the first wire 50 fixed at a wind attack angle of 90°.

[0058] Therefore, this design enables researchers to systematically study the impact of the key parameter of wind attack angle on the starting conditions, amplitude, frequency, and morphology of conductor galloping. By varying the wind attack angle, it is possible to identify the range of wind attack angles where galloping is most likely to occur or is most intense under a specific conductor configuration. Understanding the galloping characteristics under different wind attack angles is of great guiding significance for the route selection of transmission lines (for example, avoiding the most unfavorable angle between the line direction and the local dominant wind direction) and anti-galloping design.

[0059] In one embodiment of the present application, different types or specifications of anti-dancing devices are installed on the first conductive wire 50 and the second conductive wire 40 to intuitively compare the effects of different anti-dancing devices.

[0060] A wide variety of anti-galloping devices are currently used on transmission lines, including various types of spacers, interphase spacers, damping wires, torsional dampers, and aerodynamic modification devices (such as spoilers and conductor rotation devices). By installing these anti-galloping devices, based on different principles and designs, on test conductors, their effectiveness in suppressing conductor gallop can be directly observed and measured under identical or controlled test conditions (such as identical wind speed, direction, icing, and conductor type).

[0061] Even for the same type of anti-dancing device, its specific parameters (such as mass, size, installation spacing, damping coefficient, etc.) will affect its performance. For example, damping hammers of different weights, spacers of different stiffness, etc. By testing similar devices of different specifications, the design parameters of the device can be optimized to find the best anti-dancing effect. Specifically, the following tests can be performed:

[0062] 1. Parallel comparison: If the model and installation parameters (such as span and sag) of the first conductor 50 and the second conductor 40 are basically the same, and the wind field conditions they experience are also similar (for example, both are in vertical wind direction, or the second conductor 40 is also at the same wind attack angle as the first conductor 50 by adjusting the third tower 30), then by installing different anti-dancing devices on them, it can be very intuitive to see which device can more effectively reduce the dancing amplitude, delay the dancing wind speed, or change the dancing form (for example, converting a large-amplitude elliptical or figure-eight dancing into a small-amplitude swing).

[0063] 2. Comparison with a bare conductor: One conductor can serve as a control (without any anti-galloping device, or with a known reference device installed), while the other conductor is equipped with the anti-galloping device to be evaluated. By comparing the galloping behavior of the two conductors under the same wind conditions, the effectiveness of the anti-galloping device can be clearly determined.

[0064] By systematically comparing the effectiveness of different anti-galloping devices, we can provide a scientific basis for selecting and applying them in practical projects. For example, for a specific type of conductor, specific icing conditions, or specific terrain environment, we can select the anti-galloping device that has the best experimentally verified effect.

[0065] In one embodiment of the present application, the galloping test system further includes a monitoring device for monitoring the galloping state of the conductor. This monitoring device may include, for example, a displacement sensor, an acceleration sensor, or an image acquisition device (not shown). Some of these monitoring devices may be mounted on the tower or the conductor, while others may be independently mounted, and this application is not limited thereto.

[0066] The addition of these monitoring devices is crucial for enabling intuitive comparisons and conducting in-depth scientific research. While the naked eye can visually observe whether a conductor is dancing and its approximate intensity, scientific research and engineering assessments require precise, quantitative data. Monitoring equipment can transform the dynamic behavior of conductors into measurable, recordable, and analyzable data.

[0067] Displacement sensors can directly measure the displacement of a conductor in space, including vertical, horizontal, and possibly axial displacement. This displacement data can accurately determine the conductor's dancing amplitude (maximum displacement), its trajectory (e.g., elliptical, figure-eight, and other specific shapes and dimensions), and the specific location where the dancing occurred.

[0068] Accelerometers can measure changes in acceleration at a specific point on a conductor. Accelerometer data can be used to analyze the conductor's vibration frequency and intensity, and through integration, velocity and displacement can be indirectly inferred. Accelerometer data is also crucial for analyzing stress and energy changes within the conductor.

[0069] The image acquisition device, such as a high-speed camera or a common camera, can record the dancing process of the conductor from different angles.

[0070] When comparing the dancing states of conductors with different configurations (such as different models, different icing, different anti-dancing devices installed) or in different test conditions (such as different wind speeds, different wind attack angles, different spans), the data provided by these monitoring devices become objective basis for comparison. For example, by comparing the maximum dancing amplitudes measured by the displacement sensors in different cases, it can be quantitatively judged which case has more severe dancing, or which anti-dancing measure is better. By comparing the frequency components measured by the acceleration sensors, the dominant frequency and energy distribution of the dancing under different conditions can be analyzed. The video recorded by the image acquisition device can be repeatedly played back for detailed motion analysis and morphology comparison.

[0071] The embodiment of the present application also provides a dancing test method of an overhead transmission line, which is implemented based on the dancing test system as described above, and the method comprises the following steps:

[0072] As shown in Figure 3 The method can further comprise the following sub-steps:

[0073] Step S301: placing the conductor suspended between the first tower and the second tower in a region perpendicular to the main wind direction of the land block, so as to intuitively compare the dancing states of the multiple conductors suspended in parallel between the first tower and the second tower under the condition that the wind direction is perpendicular to the conductors.

[0074] Step S302: moving the third tower around the circular arc track, so that the conductor suspended between the first tower and the third tower changes between 0 degrees and 90 degrees with respect to the main wind direction of the land block, to intuitively compare the dancing states of the conductor suspended between the first tower and the second tower and the conductor suspended between the first tower and the third tower.

[0075] Step S303: replacing the types, materials or sizes of the conductors suspended between the first tower and the second tower and between the first tower and the third tower, to intuitively compare the dancing states of the conductors with different configurations.

[0076] Step S304: Replace the conductor's suspension points on the first, second, and third towers to visually compare the galloping behavior of conductors at different suspension heights and spacings. The suspension points are located at multiple heights, spacings, and directions on the first, second, and third towers. For example, the conductor's suspension height can be adjusted, or for split conductors, the spacing or arrangement between the sub-conductors can be adjusted. While other test conditions (such as conductor type and wind attack angle) remain consistent or controlled, observe and record the changes in the conductor's galloping behavior caused by the changes in suspension parameters for visual comparison.

[0077] Step S305: Different anti-galloping devices are installed on two identically configured conductors suspended at the same height between the first and second towers to visually compare the effectiveness of the different anti-galloping devices. Alternatively, in this embodiment, a bare conductor without any device installed can be set up as a control group. Under the same wind conditions, the galloping behavior of each conductor is observed and recorded to visually compare the actual effectiveness of the different anti-galloping devices.

[0078] From the above, it can be seen that the galloping test method for overhead transmission lines proposed in this application, through the clever design of movable towers and diversified conductor layout schemes, can flexibly adjust the span of the test conductor and the angle with the dominant wind direction, thereby simulating a variety of complex actual working conditions in a real natural wind field. This design not only significantly improves the flexibility of the test and the efficiency of land use, but also can use the uniformity and stability of the wind conditions of the plot to achieve intuitive comparative studies of the conductor galloping state and anti-galloping effect of different parameters (such as conductor model, number of splits, type of icing, whether anti-galloping devices are installed, etc.) under simultaneous and identical wind excitation conditions. It provides a reliable, efficient and economical test platform for the anti-galloping design of transmission lines, the effectiveness evaluation of anti-galloping measures, and the in-depth analysis of the galloping mechanism, thereby improving the accuracy and practicality of the research.

[0079] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A dancing test system for overhead transmission lines, characterized in that: The system comprises: The first tower, the second tower and the third tower are installed on a flat open plot of land where a uniform and stable horizontal wind of 5 to 15 m / s is easily formed; A plurality of conductors are provided between the first tower and the second tower, and between the first tower and the third tower; The second tower or the third tower is disposed on a preset track, and the second tower or the third tower is movable along the preset track.

2. The overhead transmission line dancing test system according to claim 1, characterized in that: The first tower, the second tower and the third tower are provided with a plurality of wire hanging points with different heights, different intervals and different angles.

3. The overhead transmission line dancing test system according to claim 1, characterized in that: The conductor is one or more of a single conductor, a two-split conductor, a three-split conductor, a four-split conductor, a six-split conductor or an eight-split conductor.

4. The overhead transmission line dancing test system according to claim 1, characterized in that: The tension of the wire can be adjusted.

5. The overhead transmission line dancing test system according to claim 1, characterized in that: The ice covering the conductor is naturally formed ice or artificially simulated ice with various parameters.

6. The overhead transmission line dancing test system according to claim 1, characterized in that: The wire is a charged or uncharged wire.

7. The overhead transmission line dancing test system according to claim 1, characterized in that: The conductor between the first tower and the second tower forms an angle of 90° with the dominant wind direction of the land.

8. The overhead transmission line dancing test system according to claim 7, characterized in that: The preset track includes a first preset track provided on a line connecting the first tower and the second tower, and the second tower is movable along the first preset track.

9. The overhead transmission line dancing test system according to claim 8, characterized in that: The preset track includes a second preset track provided between the second tower and the third tower, the second preset track is an arc-shaped track, and the third tower can move along the second preset track.

10. The overhead transmission line dancing test system according to claim 1, characterized in that: Anti-dancing devices of different types or specifications are installed on the wires.

11. The overhead transmission line dancing test system according to claim 1, characterized in that: The system further comprises a monitoring device for monitoring the galloping state of the wire.

12. The overhead transmission line dancing test system according to claim 11, characterized in that: The monitoring device includes a displacement sensor, an acceleration sensor or an image acquisition device.

13. A galloping test method for an overhead transmission line, characterized in that: The method is implemented based on the dancing test system according to any one of claims 1 to 12, and includes: using the dancing test system to observe, record and intuitively compare the dancing state of the conductor under different working conditions or the anti-dancing effect of the anti-dancing device.

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