Device and method for measuring shearing force of wire icing

Abstract

The invention discloses a device and a method for measuring shearing force of wire icing. The device comprises a shearing force measuring module, a control module and a data analysis module, the shearing force measuring module realizes uniform coating of an ice layer by utilizing an icing assisting and separating guide mold, a movable clamp and the mold are matched to act on a wire, a driving device drives a lower clamp to move upwards at a constant speed, the mold applies axial shearing force to the ice layer until the ice layer is separated, and a tension sensor monitors in real time and transmits data to the control module. The control module regulates the clamp to move and generates a tension curve, and the data analysis module calculates the shear strength and evaluates the anti-ice-dredging performance of the wire. According to the measuring device, the ice coating thickness difference is eliminated through the mold, an ice layer separation path is guided during measurement, ice coating shearing force is applied in cooperation with the movable clamp, and the measuring precision is ensured. According to the invention, the measurement error of the shearing force of wire icing is small, the measurement result is accurate and reliable, and scientific support is provided for optimization of an anti-icing and deicing technology of a power transmission line and safe operation of a power system.

Description

Technical Field

[0001] The present invention relates to the technology of preventing and removing ice on transmission line conductors, and particularly to a device and method for measuring the shear force of ice on conductors. Background Art

[0002] Overhead transmission line conductors are important carriers for power transmission. Since transmission lines need to cross many areas with extremely complex terrains and harsh climates, their safe and stable operation is severely affected by natural conditions and topographies. Under specific topographical and meteorological conditions, the windward side of transmission line conductors is affected by the oncoming flow, and it is extremely easy for ice to form on their surfaces. For artificial systems similar to power systems, atmospheric icing is a serious threat, and the icing problem of transmission line conductors is particularly prominent. Icing on transmission line conductors will cause mechanical and electrical accidents. The icing of conductors has a huge impact on the stable and safe operation of power systems. Therefore, there have been a large number of studies on the technology of preventing and removing ice on conductors. However, in the field of preventing and removing ice on conductors, the measurement of the shear force of ice on conductors has always been a major difficulty, causing great difficulties in judging the anti-icing performance of conductors. Therefore, providing an accurate and reliable method for measuring the shear force of ice on conductors is particularly important for solving the problem of conductor icing and ensuring the safe and stable operation of power systems.

[0003] It should be noted that the information disclosed in the above background art section is only used for understanding the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The main object of the present invention is to overcome the defects existing in the above background art, and to provide a device and method for measuring the shear force of ice on conductors.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A device for measuring the shear force of ice on conductors, comprising: A shear force measurement module, including a mobile fixture, an ice covering auxiliary and separation guiding die, a driving device, and a tensile force detection system; the mobile fixture includes an upper fixture and a lower fixture. The upper fixture is used to fix the upper end of the ice-covered conductor. The ice-covered conductor is assisted by the ice covering auxiliary and separation guiding die pre-sleeved on the conductor to achieve uniform ice covering. The lower fixture is arranged on the lower side of the ice covering auxiliary and separation guiding die. The driving device applies a tensile force to the lower fixture, driving the lower fixture to move upward, thereby driving the ice covering auxiliary and separation guiding die to apply a shear force to the ice layer on the ice-covered conductor until the ice layer detaches from the conductor. The tensile force detection system includes a tensile force sensor arranged between the driving device and the lower fixture. The tensile force sensor monitors and transmits tensile force data to the control module in real time; A control module, which is used to regulate the movement of the mobile fixture, record the tensile force data and output the tensile force curve; A data analysis module, which calculates the shear strength based on the ice-covered area and the measured shear force to analyze the anti-icing and de-icing performance of the wire.

[0006] Furthermore, the upper fixture of the mobile fixture is a square block with a circular hole-shaped groove for adapting to the wire; the lower fixture adjusts its position through the control module to ensure uniform contact pressure with the ice-covered auxiliary and separation guiding die.

[0007] Furthermore, the ice-covered auxiliary and separation guiding die is provided with a circular hole matching the diameter of the wire, and during the ice-covered process, the wire rotates periodically relative to the ice-covered auxiliary and separation guiding die to achieve uniform wrapping of the ice layer.

[0008] Furthermore, the ice-covered auxiliary and separation guiding die is an iron sheet die.

[0009] Furthermore, the tensile force sensor is linked with the mobile fixture, and when the lower fixture is lifted at a constant speed, the tensile force value required for separating the ice layer is recorded in real time.

[0010] Furthermore, the data analysis module calculates the shear strength through the following formula:

[0011] wherein, is the shear strength, is the shear force, is the ice-covered area, , is the wire diameter, is the length of the ice covering on the wire.

[0012] A method for measuring the shear force of ice-covered wire, using the measuring device for the shear force of ice-covered wire as described above, includes the following steps: S1. Perform ice covering treatment on the wire in an artificial climate chamber to prepare a test sample with uniform ice covering; S2. Install the ice-covered wire onto the shear force measurement module, adjust the mobile fixture to fix it and make it in close contact with the ice-covered auxiliary and separation guiding die; S3. Lift and separate the ice layer uniformly through the lower fixture, measure the shear force and record the data; S4. Calculate the shear strength based on the ice-covered area and the shear force to analyze the anti-icing and de-icing performance of the wire.

[0013] Preferably, the data reliability is improved by taking the average value through multiple measurements.

[0014] Further, in step S1, the icing process includes periodically rotating the wire and using an ice knife to polish the ice shape to achieve uniform wrapping of the ice layer, so that the contact area between the ice and the wire is the same at each position.

[0015] Further, in step S2, during the measurement process, the wire is vertically fixed, and the height and position of the mobile fixture are adjusted in real time by the control module.

[0016] Further, in step S4, the shear strength calculation formula is:

[0017] Where, is the shear strength, is the shear force, is the icing area, , is the wire diameter, is the length of the ice covering on the wire.

[0018] The present invention has the following beneficial effects: The present invention provides a measuring device and method for the shear force of wire icing. Aiming at the problem of measuring the shear force of wire icing in transmission lines, a high-precision and highly universal solution is provided. Through the synergistic effect of a mobile fixture, an icing auxiliary and separation guiding die, a tensile sensor, and an automatic control system, the shear force of wire icing is measured with small measurement errors and accurate and reliable measurement results. It is applicable to wires of any size and icing under any conditions, with universality, providing strong support for the anti-icing and de-icing work of transmission lines and ensuring the safe and stable operation of the power system. The present invention can effectively eliminate the errors caused by operation differences in traditional measurement methods, can adapt to different diameter wires and various icing conditions, provides a scientific basis for accurately evaluating the anti-icing and de-icing performance of wires and optimizing the ice disaster prevention strategies of transmission lines, and thus ensures the safe and stable operation of the power system under complex terrains and severe climates.

[0019] Other beneficial effects in the embodiments of the present invention will be further described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the measuring device according to the embodiment of the present invention.

[0021] Figure 2 is a schematic diagram of the icing auxiliary and separation guiding die and wire icing according to the embodiment of the present invention.

[0022] Figure 3 is a schematic diagram of wire fixation according to the embodiment of the present invention.

[0023] Figure 4 is a flowchart of the measuring method according to the embodiment of the present invention.

[0024] In the figure: 1. Control module; 2. Tensile force detection system; 3. Device housing; 4. Base; 5. Lower fixture; 6. Upper fixture; 7. Ice covering auxiliary and separation guiding die; 8. Ice-covered wire; 9. Ice layer. Specific embodiments

[0025] The following provides a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0026] 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, the connection can be for a fixing function or for a coupling or communicating function.

[0027] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0029] Refer to Figures 1 to 3 , an embodiment of the present invention provides a device for measuring the shearing force of ice-covered wires, including a shearing force measurement module, a control module 1, and a data analysis module.

[0030] The shear force measurement module includes a device housing 3, a base 4, a mobile fixture, an icing assistance and separation guiding die 7, a driving device (not shown), and a tensile force detection system 2. Specifically, the mobile fixture and the base 4 are installed inside the device housing 3, and the lower end of the ice-covered wire 8 can be placed on the base 4. The mobile fixture includes an upper fixture 6 and a lower fixture 5. The upper fixture 6 is used to fix the upper end of the ice-covered wire 8. The ice-covered wire 8 is assisted by the icing assistance and separation guiding die 7 pre-sleeved on the wire to achieve uniform icing. The lower fixture 5 is arranged on the lower surface of the icing assistance and separation guiding die 7. The driving device applies a tensile force to the lower fixture 5, driving the lower fixture 5 to move upward, thereby driving the icing assistance and separation guiding die to apply a shear force to the ice layer 9 on the ice-covered wire until the ice layer detaches from the wire. The tensile force detection system includes a tensile force sensor arranged between the driving device and the lower fixture 5, and the tensile force sensor monitors and transmits tensile force data to the control module 1 in real time.

[0031] The control module 1 is used to regulate the movement of the mobile fixture, record the tensile force data, and output a tensile force curve. The data analysis module calculates the shear strength based on the icing area and the measured shear force to analyze the anti-icing and de-icing performance of the wire.

[0032] The shear force measurement module first uses the icing assistance and separation guiding die to achieve uniform wrapping of the ice layer. Through the cooperation of the mobile fixture and the die acting on the wire, the driving device drives the lower fixture to move upward at a constant speed, so that the die applies an axial shear force to the ice layer until it detaches. The tensile force sensor monitors and transmits data to the control module in real time. The measurement device of the present invention effectively eliminates the difference in ice thickness using the die, and guides the ice layer separation path during measurement, and cooperates with the mobile fixture of the present invention to apply the icing shear force to ensure the measurement accuracy.

[0033] Refer to Figure 1 and Figure 3 In some embodiments, the upper fixture 6 of the mobile fixture is a square block with a circular hole-shaped groove with an adjustable diameter, which is used to adapt to wires with different diameters; the position of the lower fixture 5 is adjusted by the control module 1 to ensure uniform contact pressure with the icing assistance and separation guiding die.

[0034] Refer to Figure 2, in some embodiments, the ice - covering auxiliary and separation guiding die 7 is provided with round holes matching the diameter of the wire. During the ice - covering process, the wire rotates periodically relative to the ice - covering auxiliary and separation guiding die 7 to achieve uniform wrapping of the ice layer. During the measurement process, the ice - covering auxiliary and separation guiding die 7 accurately guides the separation path of the ice layer from the wire through its round - hole structure, which helps to ensure uniform axial transmission of the shear force and avoid local stress concentration or asymmetric peeling of the ice layer. The combination of the uniform ice - covering formed by periodic rotation and the rigid support of the die can eliminate the interference of ice - layer thickness differences on the measurement results, significantly improving the accuracy of the shear - force data and the repeatability of the test process.

[0035] In some embodiments, the ice - covering auxiliary and separation guiding die 7 can be an iron - sheet die made of iron material, but the material of the die is not limited to iron.

[0036] In some embodiments, the tensile sensor is linked with the mobile fixture, and when the lower fixture 5 is lifted at a constant speed, the tensile force value required to separate the ice layer is recorded in real - time.

[0037] The embodiment of the present invention also provides a method for measuring the shear force of ice - covered conductors. This method uses the measuring device for the shear force of ice - covered conductors in any of the foregoing embodiments, and includes the following steps: Step S1. Perform ice - covering treatment on the conductor in an artificial climate chamber to prepare a test sample with uniform ice - covering. Step S2. Install the ice - covered conductor onto the shear - force measurement module, and adjust the mobile fixture to fix it and make it in close contact with the ice - covering auxiliary and separation guiding die 7. Step S3. Lift and separate the ice layer at a constant speed through the lower fixture 5, measure the shear force and record the data. Step S4. Calculate the shear strength based on the ice - covered area and the shear force to analyze the anti - icing and de - icing performance of the conductor.

[0038] In some embodiments, the data reliability is improved by taking the average value through multiple measurements.

[0039] In some embodiments, in step S1, the ice - covering process includes periodically rotating the wire and using an ice knife to polish the ice shape to achieve uniform wrapping of the ice layer, so that the contact area between the ice and the wire at each position is the same.

[0040] In some embodiments, in step S2, during the measurement process, the wire is vertically fixed, and the height and position of the mobile fixture are adjusted in real - time by the control module 1.

[0041] In some embodiments, in step S4, the shear - strength calculation formula is:

[0042] Where is the shear strength, is the shear force, is the ice-covered area, , is the wire diameter, is the length of the ice covering on the wire.

[0043] The measuring device and method for the shear force of ice-covered wires of the present invention can accurately and reliably measure the shear force of ice-covered wires, thereby accurately analyzing and judging the ice prevention and de-icing performance of wires, and further providing a scientific basis for the active defense of ice disasters on transmission lines. The present invention measures the shear force of ice-covered wires with small measurement errors, accurate and reliable measurement results, and can be applied to wires of any size and ice covering under any circumstances, with universality, providing strong support for the ice prevention and de-icing work of transmission lines and ensuring the safe and stable operation of the power system.

[0044] The following further describes the method for measuring the shear force of ice-covered wires in specific embodiments of the present invention.

[0045] Step S1. Preparation of test samples. Conduct an ice-covered wire test in an artificial climate chamber to obtain a test wire with ice covering; Step S2. Assembly of the test device. Install the test wire obtained in Step S1 into the shear force measuring device and assemble the measuring device completely; Step S3. Shear force measurement. Use the measuring device to measure the shear force of the test wire and take the average value after multiple measurements; Step S4. Calculation and analysis of ice-covered shear strength and ice prevention and de-icing performance. Calculate the ice-covered shear strength of the wire and analyze the ice prevention and de-icing performance of the wire.

[0046] Specifically, in Step S1, first prepare n ice-covering auxiliary and separation guiding molds 7 and n wires with a length of 0.5 m. The ice-covering auxiliary and separation guiding mold 7 is provided with a round hole with the same diameter as the wire diameter, so that the wire can just pass through the ice-covering auxiliary and separation guiding mold 7, as shown in Figure 2 (a); then combine the wire with the ice-covering auxiliary and separation guiding mold 7, conduct an ice-covering test on n wires simultaneously in an artificial climate chamber, and rotate the wire every 15 minutes to ensure that the wire is completely wrapped by ice. After the ice covering is completed, use an ice knife to polish the ice shape so that the contact area of the ice at each position with the wire is the same, as shown in Figure 2 (b).

[0047] In Step S2, the measuring device is as shown in Figure 1As shown, the mobile fixture can adjust its height through the control module 1. The fixture consists of an upper fixture 6 and a lower fixture 5. The upper fixture 6 is a square iron block with a round hole-shaped groove in the middle, and the diameter of the groove can be adjusted to ensure that the wire can be fixed precisely. The lower fixture 5 can make close contact with the ice-covering auxiliary and separation guiding die 7 on the wire; the tensile force detection system includes a tensile force sensor, which can monitor the magnitude of the tensile force in real time and transmit it to the control module 1; the control module 1 is used to control the height of the fixture, record the tensile force data, and output the tensile force curve.

[0048] When measuring the shear force, the tensile force detection system, the mobile fixture are connected to the control module 1, and the control module 1 is used to control the height of the fixture to verify whether its connection is correct; secondly, open the front cover of the device, and adjust the height of the mobile fixture through the control module 1 so that the wire can be precisely vertically fixed to the fixture. At the same time, adjust the position of the lower fixture 5 so that it just contacts the ice-covering auxiliary and separation guiding die 7 on the wire, as Figure 3 shown.

[0049] In step S3, the length of the ice covering on the wire can be measured first, denoted as . Use the following formula to calculate the ice-covering area of the wire :

[0050] where, is the wire diameter; Secondly, set the lower fixture 5 on the control module 1 to slowly lift at a fixed speed, and the upper fixture 6 fixes the wire without moving, so that the ice-covering auxiliary and separation guiding die 7 on the wire and the ice are separated from the wire and fall off. Record the tensile force data output by the tensile force detection system 2. Repeat the same steps for other wires to obtain the ice-covering area and the corresponding shear force data set.

[0051] In step S4, calculate the shear strength of the ice covering on the wire according to the following formula:

[0052] where, is the shear strength, is the shear force, is the ice-covering area. Analyze and judge the anti-icing and de-icing ability of the wire according to the shear strength. The smaller the shear strength, the better the anti-icing and de-icing performance of the wire.

[0053] In summary, the present invention proposes a device and method for measuring the shear force of ice on conductors. Aiming at the problem of measuring the shear force of ice on conductors of transmission lines, a high-precision and highly universal solution is provided. Through the collaborative action of a mobile fixture, an ice-covering auxiliary and separation guiding die, a tensile sensor, and an automated control system, combined with controllable ice covering in an artificial climate chamber, it is ensured that the ice layer uniformly wraps and the contact area is consistent. By lifting the lower fixture at a constant speed to monitor the shear force in real time and calculate the shear strength, the errors caused by operation differences in traditional measurement methods are effectively eliminated. It can be adapted to conductors of different diameters and various ice-covering conditions, improving the reliability of measurement results, providing a scientific basis for accurately evaluating the ice prevention and removal performance of conductors and optimizing the ice disaster prevention strategy of transmission lines, thereby ensuring the safe and stable operation of the power system under complex terrains and harsh climates.

[0054] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the protection scope of the patent application.

Claims

1. A measuring device for the shearing force of ice-covered conductors, characterized in that, Comprising: A shear force measurement module, including a mobile fixture, an ice coating assistance and separation guiding die, a driving device, and a tensile force detection system; the mobile fixture includes an upper fixture and a lower fixture, the upper fixture is used to fix the upper end of the ice-coated wire, the ice-coated wire is assisted by the ice coating assistance and separation guiding die pre-sleeved on the wire to achieve uniform ice coating, the lower fixture is arranged on the lower side of the ice coating assistance and separation guiding die, the driving device applies a tensile force to the lower fixture, driving the lower fixture to move upward so as to drive the ice coating assistance and separation guiding die to apply a shear force to the ice layer on the ice-coated wire until the ice layer detaches from the wire; the tensile force detection system includes a tensile force sensor arranged between the driving device and the lower fixture, and the tensile force sensor monitors and transmits tensile force data to the control module in real time; A control module, used to regulate the movement of the mobile fixture, record tensile force data, and output a tensile force curve; A data analysis module, calculating the shear strength based on the ice-coated area and the measured shear force to analyze the anti-icing and de-icing performance of the wire.

2. The measuring device for the ice-shear force of a wire as described in claim 1, wherein, The upper fixture of the mobile fixture is a square block with a round hole-shaped groove for adapting to the wire; the position of the lower fixture is adjusted by the control module to ensure uniform contact pressure with the ice coating assistance and separation guiding die.

3. The measuring device for the ice-shear force of a wire according to claim 1, characterized in that The ice coating assistance and separation guiding die is provided with a round hole matching the diameter of the wire, and the ice layer is uniformly wrapped by the periodic rotation of the wire relative to the ice coating assistance and separation guiding die during the ice coating process.

4. The measuring device for the ice-shear force of a wire according to claim 1, wherein, The ice coating assistance and separation guiding die is an iron sheet die.

5. The measuring device for the icing shear force of a wire according to any one of claims 1 to 4, characterized in that, The tensile force sensor is linked with the mobile fixture, and the tensile force value required for separating the ice layer is recorded in real time when the lower fixture is lifted at a constant speed.

6. The measuring device for the ice-shear force of a conductor according to any one of claims 1 to 4, characterized in that, The data analysis module calculates the shear strength through 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 the ice covering on the wire.

7. A method for measuring the shear force of ice-covered conductors, using the measuring device for the shear force of ice-covered conductors according to any one of claims 1 to 6, characterized in that, Including the following steps: S1. Perform ice coating treatment on the wire in an artificial climate chamber to prepare a test sample with uniform ice coating; S2. Install the ice-coated wire on the shear force measurement module, adjust the mobile fixture to fix it and make it in close contact with the ice coating assistance and separation guiding die; S3. Lift and separate the ice layer uniformly through the lower fixture, measure the shear force and record the data; S4. Calculate the shear strength based on the ice-coated area and the shear force to analyze the anti-icing and de-icing performance of the wire.

8. The method for measuring the shear force of ice on a conductor according to claim 7, wherein, In step S1, the ice coating process includes periodically rotating the wire and using an ice knife to polish the ice shape to achieve uniform wrapping of the ice layer, so that the contact area between the ice and the wire at each position is the same.

9. The method for measuring the ice-shear force of a wire according to claim 7 or 8, characterized in that In step S2, the wire is vertically fixed during the measurement process, and the height and position of the mobile fixture are adjusted in real time by the control module.

10. The method for measuring the ice-shear force of a wire according to claim 7 or 8, characterized in that, In step S4, the shear strength calculation formula is: ； Among them, is the shear strength, is the shear force, is the ice-covered area, , is the wire diameter, is the length of the ice covering on the wire.

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