A Measuring Device and Method for Shearing Force of Iced Conductors

Abstract

A device and method for measuring the shear force of ice coating on conductors, the device comprises a shear force measurement module, a control module and a data analysis module. The shear force measurement module first uses an ice coating auxiliary and separation guide mold to achieve uniform wrapping of the ice layer, and cooperates with the mold to act on the conductor through a movable clamp. The driving device drives the lower clamp to move upward at a uniform speed, so that the mold applies axial shear force to the ice layer until it is detached. The tension sensor monitors in real time and transmits data to the control module. The control module regulates the movement of the clamp and generates a tension curve, and the data analysis module calculates the shear strength and evaluates the anti-icing performance of the conductor. The measuring device of the present invention uses a mold to eliminate the difference in ice coating thickness, and guides the ice layer separation path during measurement, and cooperates with the movable clamp of the present invention to apply ice coating shear force to ensure measurement accuracy. The present invention has a small error in measuring the shear force of conductor ice coating, and the measurement results are accurate and reliable, providing scientific support for the optimization of anti-icing and ice-dredging technology for transmission lines and the safe operation of power systems.

Description

Technical Field

[0001] The present invention relates to a technology for preventing ice shedding of conductors in power transmission lines, and in particular to a device and method for measuring the shear force of ice coating on conductors. Background Art

[0002] Overhead transmission lines are crucial vehicles for power transmission. Because they must traverse regions with extremely complex terrain and harsh climates, their safe and stable operation is significantly impacted by natural conditions and topography. Under specific terrain and meteorological conditions, the windward surfaces of transmission lines are subject to the effects of incoming currents, making them susceptible to ice buildup. Atmospheric icing poses a serious threat to artificial systems like power systems, with icing on transmission line conductors being a particularly prominent issue. Icing on transmission line conductors can cause mechanical and electrical accidents. Conductor icing significantly impacts the stable and safe operation of power systems, leading to extensive research on conductor anti-icing technologies. However, measuring the shear force of icing has been a major challenge within this area, making it difficult to assess the anti-icing performance of conductors. Therefore, providing an accurate and reliable method for measuring the shear force of icing is crucial to addressing the issue and ensuring the safe and stable operation of power systems.

[0003] It should be noted that the information disclosed in the above background technology section is only used to understand the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0004] The main purpose of the present invention is to overcome the defects existing in the above-mentioned background technology and provide a device and method for measuring the shear force of ice coating on a conductor.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for measuring the shear force of ice coating on a conductor, comprising:

[0007] The shear force measurement module includes a movable clamp, an ice-coating auxiliary and separation guide mold, a driving device and a tension detection system; the movable clamp includes an upper clamp and a lower clamp, the upper clamp is used to fix the upper end of the ice-coated wire, and the ice-coated wire is assisted by the ice-coating auxiliary and separation guide mold pre-set on the wire to achieve uniform ice coating, and the lower clamp is arranged on the lower side of the ice-coating auxiliary and separation guide mold, the driving device applies tension to the lower clamp, drives the lower clamp to move upward, thereby driving the ice-coating auxiliary and separation guide mold to apply shear force to the ice layer on the ice-coated wire until the ice layer is separated from the wire; the tension detection system includes a tension sensor arranged between the driving device and the lower clamp, and the tension sensor monitors and transmits tension data to the control module in real time;

[0008] A control module, used to control the movement of the mobile fixture, record the tension data and output the tension curve;

[0009] The data analysis module calculates the shear strength based on the ice-covered area and the measured shear force to analyze the anti-icing performance of the conductor.

[0010] Furthermore, the upper fixture of the movable fixture is a square block with a circular hole-shaped groove for adapting the wire; the lower fixture adjusts its position through a control module to ensure uniform contact pressure with the ice-coating auxiliary and separation guide molds.

[0011] Furthermore, the ice-coating auxiliary and separation guide mold is provided with a circular hole matching the diameter of the wire, and during the ice-coating process, the wire periodically rotates relative to the ice-coating auxiliary and separation guide mold to achieve uniform ice wrapping.

[0012] Furthermore, the ice coating auxiliary and separation guide mold is an iron sheet mold.

[0013] Furthermore, the tension sensor is linked to the movable clamp, and the tension value required to separate the ice layer is recorded in real time when the lower clamp is lifted at a constant speed.

[0014] Furthermore, the data analysis module calculates the shear strength using the following formula:

[0015]

[0016] in, is the shear strength, is the shear force, is the ice-covered area, , is the wire diameter, is the length of ice covering the conductor.

[0017] A method for measuring the shear force of ice-coated conductors, using the device for measuring the shear force of ice-coated conductors, comprises the following steps:

[0018] S1. Ice the conductors in an artificial climate chamber to prepare uniformly iced test specimens.

[0019] S2. Install the icing wire to the shear force measurement module and adjust the movable fixture to ensure it is securely in contact with the icing assist and separation guide molds.

[0020] S3. Separate the ice layer by lifting the lower fixture at a constant speed, measuring the shear force and recording the data;

[0021] S4. Calculate the shear strength based on the ice-covered area and shear force to analyze the anti-icing performance of the conductor.

[0022] Preferably, an average value is obtained through multiple measurements to improve data reliability.

[0023] Furthermore, in step S1, the icing process includes periodically rotating the conductor and using an ice skate to grind the ice shape to achieve uniform wrapping of the ice layer so that the contact area between the ice and the conductor at each position is consistent.

[0024] Furthermore, in step S2, the conductor is fixed vertically during the measurement process, and the height and position of the movable fixture are adjusted in real time by the control module.

[0025] Furthermore, in step S4, the shear strength calculation formula is:

[0026]

[0027] in, is the shear strength, is the shear force, is the ice-covered area, , is the wire diameter, is the length of ice covering the conductor.

[0028] The present invention has the following beneficial effects:

[0029] The present invention proposes a device and method for measuring the shear force of conductor ice coating. This method provides a high-precision and universal solution to the problem of measuring the shear force of conductor ice coating on transmission line conductors. Through the coordinated action of a mobile fixture, an ice coating auxiliary and separation guide mold, a tension sensor, and an automated control system, the shear force of conductor ice coating is measured. The measurement error is small, and the measurement results are accurate and reliable. The device is applicable to conductors of any size and ice coating under any circumstances. It is universal and provides strong support for the anti-icing and deicing work of transmission lines, ensuring the safe and stable operation of power systems. The present invention can effectively eliminate the errors caused by operational differences in traditional measurement methods, and can be adapted to conductors of different diameters and various icing conditions. It provides a scientific basis for accurately evaluating the anti-icing performance of conductors and optimizing ice disaster prevention strategies for transmission lines, thereby ensuring the safe and stable operation of power systems under complex terrain and harsh climates.

[0030] Other beneficial effects of the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the structure of a measuring device according to an embodiment of the present invention.

[0032] Figure 2 Schematic diagram of ice coating assistance and separation guide mold and wire ice coating according to an embodiment of the present invention.

[0033] Figure 3 Schematic diagram of wire fixing according to an embodiment of the present invention.

[0034] Figure 4 Flowchart of a measurement method according to an embodiment of the present invention.

[0035] In the figure, 1: control module; 2: tension detection system; 3: device housing; 4: base; 5: lower clamp; 6: upper clamp; 7: ice coating auxiliary and separation guide mold; 8: ice coating wire; 9: ice layer. DETAILED DESCRIPTION

[0036] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the present invention and its application.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and coupling or communication.

[0038] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0040] See Figures 1 to 3 An embodiment of the present invention provides a device for measuring the shear force of ice coating on a conductor, including a shear force measurement module, a control module 1 and a data analysis module.

[0041] The shear force measurement module includes a device housing 3, a base 4, a movable fixture, an ice-coating assisting and separating guiding mold 7, a drive device (not shown), and a tension detection system 2. Specifically, the movable fixture and base 4 are mounted within the device housing 3, with the lower end of the ice-coated conductor 8 resting on the base 4. The movable fixture comprises an upper fixture 6 and a lower fixture 5. The upper fixture 6 is used to secure the upper end of the ice-coated conductor 8. The ice-coated conductor 8 is uniformly coated with ice by the ice-coating assisting and separating guiding mold 7, which is pre-mounted on the conductor. The lower fixture 5 is positioned on the lower surface of the ice-coating assisting and separating guiding mold 7. The drive device applies a tensile force to the lower fixture 5, driving it upward, thereby driving the ice-coating assisting and separating guiding mold to apply a shear force to the ice layer 9 on the ice-coated conductor until the ice is detached from the conductor. The tension detection system includes a tension sensor positioned between the drive device and the lower fixture 5. The tension sensor monitors and transmits tension data in real time to the control module 1.

[0042] The control module 1 is used to control the movement of the mobile fixture, record the tension data, and output the tension curve. The data analysis module calculates the shear strength based on the ice coverage area and the measured shear force to analyze the anti-icing performance of the conductor.

[0043] The shear force measurement module first utilizes an ice-coating assist and separation-guiding mold to achieve uniform ice coverage. A movable fixture, in conjunction with the mold, acts on the conductor. A drive mechanism drives the lower fixture upward at a constant speed, causing the mold to apply axial shear force to the ice until it breaks free. A tension sensor monitors the situation in real time and transmits data to the control module. This measurement device utilizes the mold to effectively eliminate variations in ice thickness, guides the ice separation path during measurement, and applies shear force to the ice layer in conjunction with the movable fixture, ensuring accurate measurement.

[0044] See Figure 1 and Figure 3 In some embodiments, the upper clamp 6 of the movable clamp is a square block with a circular hole-shaped groove with an adjustable diameter, which is used to adapt to wires of different diameters; the lower clamp 5 is adjusted in position by the control module 1 to ensure uniform contact pressure with the ice-coating auxiliary and separation guide mold.

[0045] See Figure 2 In some embodiments, the ice-coating assisting and separation-guiding mold 7 is provided with a circular hole that matches the diameter of the wire. During the ice-coating process, the wire periodically rotates relative to the ice-coating assisting and separation-guiding mold 7 to achieve uniform ice wrapping. During the measurement process, the ice-coating assisting and separation-guiding mold 7 precisely guides the separation path of the ice layer and the wire through its circular hole structure, helping to ensure uniform axial transmission of shear force and avoid localized stress concentration or asymmetric peeling of the ice layer. The uniform ice coating formed by periodic rotation, combined with the rigid support of the mold, can eliminate interference with measurement results caused by differences in ice layer thickness, significantly improving the accuracy of shear force data and the repeatability of the test process.

[0046] In some embodiments, the ice coating auxiliary and separation guide mold 7 may be an iron sheet mold made of iron material, but the material of the mold is not limited to iron.

[0047] In some embodiments, the tension sensor is linked to the movable clamp, and the tension value required to separate the ice layer is recorded in real time when the lower clamp 5 is lifted at a constant speed.

[0048] An embodiment of the present invention further provides a method for measuring the shear force of ice coating on a conductor. The method uses the device for measuring the shear force of ice coating on a conductor according to any of the aforementioned embodiments, and includes the following steps:

[0049] Step S1. The conductors are iced in an artificial climate chamber to prepare uniformly iced test samples.

[0050] Step S2. Install the ice-coating wire to the shear force measurement module, adjust the movable fixture so that it is fixed and in close contact with the ice-coating auxiliary and separation guide mold 7;

[0051] Step S3. Separate the ice layer by lifting the lower fixture 5 at a constant speed, measure the shear force and record the data;

[0052] Step S4: Calculate the shear strength based on the ice-covered area and the shear force to analyze the anti-icing performance of the conductor.

[0053] In some embodiments, multiple measurements are averaged to improve data reliability.

[0054] In some embodiments, in step S1, the icing process includes periodically rotating the conductor and using an ice skate to grind the ice shape to achieve uniform wrapping of the ice layer so that the contact area between the ice and the conductor at each position is consistent.

[0055] In some embodiments, in step S2 , the wire is vertically fixed during the measurement process, and the height and position of the movable fixture are adjusted in real time by the control module 1 .

[0056] In some embodiments, in step S4, the shear strength calculation formula is:

[0057]

[0058] in, is the shear strength, is the shear force, is the ice-covered area, , is the wire diameter, is the length of ice covering the conductor.

[0059] The device and method for measuring the shear force of conductor ice coating, presented in the present invention, can accurately and reliably measure the shear force of conductor ice coating, thereby accurately analyzing and determining the conductor's anti-icing and deicing performance, further providing a scientific basis for proactive defense against ice disasters on power transmission lines. This method measures the shear force of conductor ice coating with minimal measurement error, resulting in accurate and reliable results. The method is applicable to conductors of any size and in any icing situation, providing strong support for anti-icing and deicing efforts on transmission lines and ensuring the safe and stable operation of power systems.

[0060] The following further describes a method for measuring the shear force of ice coating on a conductor according to a specific embodiment of the present invention.

[0061] Step S1. Test sample preparation. Conduct an ice-covered conductor test in an artificial climate chamber to obtain an ice-covered test conductor.

[0062] Step S2. Assembling the test device. Install the test wire obtained in step S1 into the shear force measuring device and assemble the measuring device completely.

[0063] Step S3. Shear force measurement. Use a measuring device to measure the shear force of the experimental conductor, and calculate the average value of multiple measurements;

[0064] Step S4. Calculate and analyze the ice shear strength and anti-icing performance of the conductor. Calculate the ice shear strength of the conductor and analyze the anti-icing performance of the conductor.

[0065] Specifically, in step S1, first prepare n ice-coating auxiliary and separation guide molds 7 and n wires with a length of 0.5 m. The ice-coating auxiliary and separation guide molds 7 are provided with circular holes with the same diameter as the wire diameter, so that the wire can just pass through the ice-coating auxiliary and separation guide molds 7. Figure 2 As shown in (a); then, the conductor is combined with the ice-coating auxiliary and separation guide mold 7, and an ice-coating test is performed on n conductors simultaneously in an artificial climate chamber. The conductors are rotated every 15 minutes to ensure that they are completely covered with ice. After the ice coating is completed, the ice shape is polished with an ice knife so that the contact area between the ice and the conductor at each position is the same, as shown in FIG. Figure 2 as shown in (b).

[0066] In step S2, the measuring device is Figure 1 As shown, the movable clamp can be adjusted in height via control module 1. The clamp consists of an upper clamp 6 and a lower clamp 5. The upper clamp 6 is a square iron block with a circular groove in the center. The groove diameter can be adjusted to ensure the conductor is securely fixed. The lower clamp 5 is able to maintain close contact with the ice-covering auxiliary and separation guide mold 7 on the conductor. The tension detection system includes a tension sensor that can monitor the tension in real time and transmit it to control module 1. Control module 1 is used to control the height of the clamp, record the tension data, and output the tension curve.

[0067] When measuring shear force, the tension detection system and the mobile fixture are connected to the control module 1, and the height of the fixture is controlled by the control module 1 to verify whether the connection is correct. Secondly, the front cover of the device is opened, and the height of the mobile fixture is adjusted through the control module 1 so that the wire can be fixed vertically on the fixture. At the same time, the position of the lower fixture 5 is adjusted so that it contacts the ice covering auxiliary and separation guide mold 7 on the wire. Figure 3 shown.

[0068] In step S3, the length of ice on the conductor can be measured first and recorded as Calculate the ice coverage area of the conductor using the following formula: :

[0069]

[0070] in, is the wire diameter;

[0071] Next, set the lower clamp 5 on the control module 1 and slowly lift it at a fixed speed. The upper clamp 6 fixes the wire so that the ice covering auxiliary and separation guide mold 7 on the wire and the ice are separated from the wire and fall off. Record the tension data output by the tension detection system 2. Repeat the same steps for other wires to obtain the ice covering area. and the corresponding shear force dataset.

[0072] In step S4, the shear strength of the ice coating on the conductor is calculated according to the following formula:

[0073]

[0074] in, is the shear strength, is the shear force, The ice-covered area is determined by the shear strength analysis. The smaller the shear strength, the better the conductor's ice-repellent performance.

[0075] In summary, the present invention proposes a device and method for measuring the shear force of ice coating on conductors. It provides a high-precision and universal solution to the problem of measuring the shear force of ice coating on transmission line conductors. Through the synergistic effect of mobile clamps, ice coating auxiliary and separation guide molds, tension sensors and automatic control systems, combined with controllable ice coating in artificial climate chambers, it ensures that the ice layer is evenly wrapped and the contact area is consistent. The clamp is lifted at a constant speed to monitor the shear force and calculate the shear strength in real time, effectively eliminating the errors caused by operational differences in traditional measurement methods. It can adapt to conductors of different diameters and various icing conditions, improve the reliability of measurement results, and provide a scientific basis for accurately evaluating the anti-icing performance of conductors and optimizing ice disaster prevention strategies for transmission lines, thereby ensuring the safe and stable operation of power systems in complex terrain and harsh climates.

[0076] The above description further details the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention should not be construed as being limited to these descriptions. Persons skilled in the art will appreciate that, without departing from the spirit of the present invention, they may make various substitutions or modifications to the described embodiments, and these substitutions or modifications should be considered to fall within the scope of protection of the present invention. Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples" indicates that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Persons skilled in the art may combine and assemble the different embodiments or examples described in this specification, as well as features of different embodiments or examples, without conflicting opinions. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications may be made herein without departing from the scope of protection of the patent application.

Claims

1. A device for measuring the shear force of ice coating on a conductor, characterized in that: include: The shear force measurement module includes a movable clamp, an ice-coating auxiliary and separation guide mold, a driving device and a tension detection system; the movable clamp includes an upper clamp and a lower clamp, the upper clamp is used to fix the upper end of the ice-coated wire, and the ice-coated wire is assisted by the ice-coating auxiliary and separation guide mold pre-set on the wire to achieve uniform ice coating, and the lower clamp is arranged on the lower side of the ice-coating auxiliary and separation guide mold, the driving device applies tension to the lower clamp, drives the lower clamp to move upward, thereby driving the ice-coating auxiliary and separation guide mold to apply shear force to the ice layer on the ice-coated wire until the ice layer is separated from the wire; the tension detection system includes a tension sensor arranged between the driving device and the lower clamp, and the tension sensor monitors and transmits tension data to the control module in real time; The upper fixture of the movable fixture is a square block with a circular hole-shaped groove for adapting to the wire; the lower fixture is adjusted in position by a control module to ensure uniform contact pressure with the ice-coating auxiliary and separation guide mold; the ice-coating auxiliary and separation guide mold is provided with a circular hole matching the diameter of the wire, and during the ice-coating process, the wire periodically rotates relative to the ice-coating auxiliary and separation guide mold to achieve uniform ice wrapping; A control module, used to control the movement of the mobile fixture, record the tension data and output the tension curve; The data analysis module calculates the shear strength based on the ice coverage area and the measured shear force to analyze the anti-icing performance of the conductor. The data analysis module calculates the shear strength using the following formula: ； Among them, is the shear strength, is the shear force, is the ice-covered area, , is the wire diameter, is the length of ice covering the conductor.

2. The device for measuring the shear force of ice coating on a conductor according to claim 1, wherein: The ice coating auxiliary and separation guide mold is an iron sheet mold.

3. The device for measuring the shear force of ice coating on a conductor according to any one of claims 1 to 2, characterized in that: The tension sensor is linked to the movable clamp, and the tension value required to separate the ice layer is recorded in real time when the lower clamp is lifted at a constant speed.

4. A method for measuring the shear force of ice coating on a conductor, using the device for measuring the shear force of ice coating on a conductor according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Ice the conductors in an artificial climate chamber to prepare uniformly iced test specimens. S2. Install the icing wire to the shear force measurement module and adjust the movable fixture to ensure it is securely in contact with the icing assist and separation guide molds. S3. Separate the ice layer by lifting the lower fixture at a constant speed, measuring the shear force and recording the data; S4. Calculate the shear strength based on the ice-covered area and shear force to analyze the anti-icing performance of the conductor.

5. The method for measuring the shear force of ice coating on a conductor according to claim 4, wherein: In step S1, the icing process includes periodically rotating the conductor and using an ice skate to grind the ice shape to achieve uniform ice wrapping and make the contact area between the ice and the conductor consistent at each position.

6. The method for measuring the shear force of ice coating on a conductor according to claim 4 or 5, characterized in that: In step S2, the wire is fixed vertically during the measurement process, and the height and position of the movable fixture are adjusted in real time by the control module.

Images