A device and method for testing ice adhesion strength of overhead transmission lines

Abstract

A device and method for testing the ice-coating adhesion strength of overhead power transmission lines, the testing device comprising a conductor fixing fixture, an ice-coating mold, a clamping fixture, a tensile testing machine, a tensile testing machine stepping control system, and a data processing module. The conductor fixing fixture fixes both ends of the conductor; the ice-coating support plate in the ice-coating mold is combined with the conductor slot bracket, and the ice-coating support plate is tightly attached to the surface of the conductor to form an ice-coating area, and the two are separable. The lower end of the clamping fixture is provided with symmetrical L-shaped hooks with adjustable spacing to clamp the ice-coating support plate, and the upper part is connected to the tensile testing machine. The tensile testing machine applies an upward pulling force to cause the ice-coating support plate to strip the conductor of ice. The tensile testing machine stepping control system controls the movement of the tensile testing machine and measures the tension in real time. The data processing module records the peak tension at the moment of ice stripping, and calculates the ice-coating adhesion strength based on the peak tension and the ice stripping area. The testing device and method achieve accurate and reliable detection of the adhesion strength between the ice coating and the conductor interface of overhead power transmission lines.

Description

Technical Field

[0001] The present invention relates to a transmission line icing test technology, and in particular to a device and method for testing the ice-coated bonding strength of an overhead transmission line. Background Art

[0002] In winter, power transmission lines are susceptible to icing, especially in areas with low temperatures and high humidity, such as mountain passes, lakes, and rivers. This can cause severe icing on transmission lines, increasing the load on overhead transmission lines and transmission towers. In severe cases, this can lead to tower collapses and line breakages. Currently, de-icing methods for transmission lines include DC de-icing, AC short-circuit de-icing, and drone de-icing. However, these methods are passive and some require the line to be taken out of service, resulting in reduced grid stability. Treating the surface of overhead transmission lines to reduce the adhesion of ice to the conductor surface is a viable anti-icing solution, but there is currently a lack of accurate and reliable testing methods for measuring the adhesion strength of ice on the surface of overhead transmission lines.

[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 an apparatus and method for testing the ice adhesion strength of overhead transmission lines.

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

[0006] An overhead transmission line ice adhesion strength testing device comprises:

[0007] Conductor fixing fixture, used to fix both ends of the overhead conductor;

[0008] An ice-coating mold includes a detachable ice-coating support plate and a wire slot bracket. When the ice-coating support plate is combined with the wire slot bracket, the ice-coating support plate covers the area of ​​the wire slot bracket except the wire slot and closely adheres to the surface of the overhead wire placed in the wire slot to form an ice-coating area.

[0009] A clamping fixture, the lower end of which is provided with symmetrical L-shaped hook claws with adjustable spacing, for clamping the ice-covered support plate, and the upper part of the clamping fixture is connected to the tensile testing machine;

[0010] A tensile testing machine, connected to the clamping fixture, for applying an upward tensile force so that the ice-coated supporting plate drives the ice to peel off the surface of the overhead wire;

[0011] The stepping control system of the tensile testing machine is used to control the movement of the tensile testing machine and detect the tensile force value in real time;

[0012] The data processing module communicates with the stepping control system of the tensile testing machine, and is used to record the peak tension at the moment of ice peeling, and calculate the ice adhesion strength according to the peak tension and the ice peeling area.

[0013] Furthermore, the conductor fixing fixture includes a semicircular clamp and a fixing base, the fixing base is provided with a semicircular groove matching the diameter of the overhead conductor, and the semicircular clamp is connected by bolts to clamp the overhead conductor.

[0014] Furthermore, the ice-coating support plate is made of metal, and the wire slot bracket is made of epoxy resin. The lengths of both are smaller than the lengths of the overhead wires and are arranged in parallel with the overhead wires.

[0015] Furthermore, a trapezoidal groove is provided on the lower surface of the ice-coating support plate, and a trapezoidal protrusion is provided on the upper surface of the wire slot bracket for matching with the trapezoidal groove. When the ice-coating support plate and the wire slot bracket are combined, they are limited and fixed by the trapezoidal groove and the trapezoidal protrusion.

[0016] Furthermore, the symmetrical L-shaped hooks of the clamping fixture are configured to have an adjustable spacing.

[0017] A method for testing the ice-coated bond strength of an overhead transmission line, using the aforementioned ice-coated bond strength testing device for an overhead transmission line, comprises the following steps:

[0018] S1. Test Sample Preparation: Overhead conductors were placed in an ice-coating mold. Ice was formed on the conductors and the surface of the ice-coating plate by spraying supercooled water in an artificial climate chamber. The ice that extended beyond the ice-coating plate was then removed.

[0019] S2. Test Setup: Secure both ends of the iced conductor to the conductor fixture. Clamp the ice-coated support plate with a clamp and connect it to the tensile testing machine.

[0020] S3. Ice peeling test: The tensile testing machine's stepper control system applies tension to the clamping fixture at a set speed, and the peak tensile force at the moment of ice peeling is recorded in real time.

[0021] S4. Bond strength calculation: Calculate the ice bond strength based on the peak tensile force and the ice peeling area.

[0022] Furthermore, in step S1, the ambient temperature is reduced to -3°C at a rate of 0.5°C / min to 5°C / min and maintained for at least 1 hour; in step S3, the ice temperature during the tensile test is -3°C.

[0023] Furthermore, in step S3, the moving speed range of the tensile testing machine is 0.5 mm / min to 12 mm / min, and uniform tension is applied through the tensile testing machine step control system; wherein the tension application speed includes 3 mm / min, 6 mm / min and 9 mm / min, and each speed is tested 3 times.

[0024] Furthermore, in step S4, when the ice is completely separated, the geometric area of ​​the conductor ice region is used as the ice peeling area. When the ice is not completely separated, the actual ice peeling area is calculated by taking an image.

[0025] Furthermore, in step S4, the ice adhesion strength is calculated according to the following formula:

[0026]

[0027] Where M is the ice adhesion strength, G is the peak tensile force, H is the total weight of the peeled ice and the ice support plate, and I is the ice peeling area.

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

[0029] The present invention provides an apparatus and method for testing the bonding strength of ice coatings on overhead transmission lines. By integrating a conductor fixing fixture, an ice coating mold, a clamping fixture, a tensile testing machine and a control system, accurate and reliable detection of the bonding strength between the ice coating and the conductor interface is achieved. The detachable ice coating mold design, which is a combination of an ice coating support plate and a conductor slot bracket, ensures that the ice coating area of ​​the conductor is accurately positioned and the force is evenly peeled off from the ice coating support plate during testing, thereby achieving standardized preparation and controllable peeling of ice coating samples, significantly improving the repeatability and accuracy of the test, and providing a reliable basic condition for quantifying the bonding strength of ice coatings. By applying tension at a uniform speed and collecting peak data in real time through the tensile testing machine step control system, combined with the ice coating peeling area for calculation, a quantitative evaluation of the bonding strength of ice coatings is achieved. Furthermore, the adjustable design of the fixture is synergistically optimized with the ambient temperature control to improve the test repeatability and reliability. The present invention provides high-precision experimental support for the research and development of anti-icing technology for transmission lines.

[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 an overhead transmission line ice adhesion strength testing device according to an embodiment of the present invention.

[0032] Figure 2 Schematic diagram of a wire fixing fixture according to an embodiment of the present invention.

[0033] Figure 3 Schematic diagram of the combination of the wire clamping bracket and the ice covering support plate according to an embodiment of the present invention.

[0034] Figure 4 Schematic diagram of a wire slot bracket according to an embodiment of the present invention.

[0035] Figure 5 Schematic diagram of a clamping fixture according to an embodiment of the present invention.

[0036] Figure 6 Schematic diagram of ice coating on a conductor according to an embodiment of the present invention.

[0037] Figure 7 Flowchart of a testing method according to an embodiment of the present invention.

[0038] Figure numerals: 1- conductor fixing fixture, 2- ice-coating support plate, 3- overhead conductor, 4- ice-coating, 5- clamping fixture, 6- tensile testing machine, 7- tensile testing machine stepping control system, 8- data processing module, 9- conductor slot bracket, 101- semicircular clamp, 102- fixed base. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] See Figures 1 to 6An embodiment of the present invention provides an overhead transmission line ice coating adhesion strength testing device, including a conductor fixing fixture 1, an ice coating mold, a clamping fixture 5, a tensile testing machine, a tensile testing machine stepping control system 7, and a data processing module 8 (such as an industrial computer).

[0044] The conductor fixing fixture 1 is used to secure both ends of the overhead conductor 3. The ice coating mold includes a detachable ice coating support plate 2 and a conductor slot bracket 9. When assembled with the conductor slot bracket 9, the ice coating support plate 2 covers the area of ​​the conductor slot bracket 9 except for the conductor slot and adheres tightly to the surface of the overhead conductor 3 placed within the slot, forming an ice coating 4. The lower end of the clamping fixture 5 is equipped with symmetrical L-shaped claws with adjustable spacing for clamping the ice coating support plate 2. The upper portion of the clamping fixture 5 is connected to a tensile testing machine. A tensile testing machine 6 is connected to the clamping fixture 5 and is used to apply an upward tension force so that the ice coating support plate 2 drives the ice coating 4 off the surface of the overhead conductor 3. The tensile testing machine stepper control system 7 controls the movement of the tensile testing machine 6 and detects the tension value in real time. A data processing module 8 communicates with the tensile testing machine stepper control system 7 to record the peak tension at the moment of ice coating 4 peeling and calculate the ice coating bond strength based on the peak tension and the ice coating peeling area. Due to this design, especially through the specific design and synergy of the wire fixing fixture, ice coating mold and clamping fixture, the test device achieves high precision and high reliability in ice coating bond strength testing.

[0045] See Figure 2 In some embodiments, the conductor fixing fixture 1 includes a semicircular clamp 101 and a fixed base 102, wherein the fixed base 102 is provided with a semicircular groove matching the diameter of the overhead conductor 3, and the semicircular clamp 101 is connected by bolts to clamp the overhead conductor 3.

[0046] In some embodiments, the ice-coating support plate 2 is made of metal, and the wire slot bracket 9 is made of epoxy resin. The lengths of both are smaller than the length of the overhead wire 3 and are arranged parallel to the overhead wire 3.

[0047] See Figure 3 and Figure 4 In some embodiments, a trapezoidal groove is provided on the lower surface of the ice-coating support plate 2, and a trapezoidal protrusion is provided on the upper surface of the wire slot bracket 9 for matching with the trapezoidal groove. When the ice-coating support plate 2 is combined with the wire slot bracket 9, they are limited and fixed by the trapezoidal groove and the trapezoidal protrusion.

[0048] In some embodiments, the symmetrical L-shaped hooks of the clamping fixture 5 are preferably configured to have an adjustable spacing.

[0049] See Figure 7The present invention also provides a method for testing the ice adhesion strength of an overhead transmission line, using the ice adhesion strength testing device of any of the above embodiments, including the following steps:

[0050] Step S1. Test sample preparation: Place the overhead conductor 3 in an ice-coated mold. Spray supercooled water in an artificial climate chamber to form ice 4 on the conductor and the surface of the ice-coated support plate 2. Then remove the ice layer that exceeds the ice-coated support plate 2.

[0051] Step S2. Test setup: Fix both ends of the iced conductor to the conductor fixing fixture 1, clamp the ice-covered support plate 2 with the clamping fixture 5, and connect it to the tensile testing machine 6;

[0052] Step S3 ice peeling test: The tensile machine step control system 7 controls the tensile machine 6 to apply tension to the clamping fixture 5 at a set speed, and records the peak tension at the moment of ice peeling in real time;

[0053] Step S4. Bond strength calculation: Calculate the ice-coated bond strength based on the peak tensile force and the ice-coated peeling area.

[0054] In some embodiments, in step S1, the ambient temperature is reduced to -3°C at a rate of 0.5°C / min to 5°C / min and maintained for at least 1 hour; in step S3, the ice temperature during the tensile test is -3°C.

[0055] In some embodiments, in step S3, the moving speed range of the tensile testing machine is 0.5 mm / min to 12 mm / min, and uniform tension is applied through the tensile testing machine step control system 7; preferably, the tension application speed includes 3 mm / min, 6 mm / min and 9 mm / min, and each speed is tested 3 times.

[0056] In some embodiments, in step S4, when the ice is completely separated, the geometric area of ​​the conductor ice region is used as the ice peeling area; when the ice is not completely separated, the actual ice peeling area is calculated by taking an image.

[0057] In some embodiments, in step S4, the ice adhesion strength is calculated according to the following formula:

[0058]

[0059] Where M is the ice adhesion strength, G is the peak tensile force, H is the total weight of the peeled ice and the ice support plate, and I is the ice peeling area.

[0060] Specific embodiments of the present invention are further described below.

[0061] A device for testing the bonding strength of uneven ice coating on the surface of an overhead transmission line, comprising a conductor fixing fixture 1, an ice coating support plate 2, an overhead conductor 3, ice coating 4, a clamping fixture 5, a tensile testing machine 6, a tensile testing machine step control system 7, and a data processing module 8. The schematic diagram of the device is shown in FIG. Figure 1 shown.

[0062] Wire fixing fixture 1 Figure 2 As shown, the wire fixing fixture 1 consists of two parts: a semicircular clamp 101 and a fixed base 102. The fixed base 102 is designed with a semicircular groove with the same diameter as the wire, into which the wire can be embedded. The semicircular clamp 101 and the fixed base 102 are fixed by bolts. The fixed base 102 is connected to the tensile machine 6 as a whole. When fixing the wire, two or more wire fixing fixtures 1 are used to fix the two ends of the wire. First, the wire is placed in the semicircular groove of the fixed base 102, and then the semicircular clamp 101 is buckled. The semicircular clamp 101 and the fixed base 102 are connected with bolts to clamp the wire. Preferably, the thickness A of the wire fixing fixture is ≥ 20 mm.

[0063] The ice coating mold consists of two parts: the ice coating support plate 2 and the wire slot bracket 9. Figure 3 The ice-coating support plate 2 is in the shape of a rectangular parallelepiped and is placed on the wire slot bracket 9 and is parallel to the wire. The ice-coating support plate 2 and the wire slot bracket 9 are in close contact. The ice-coating support plate 2 and the wire slot bracket 9 have the same length B, which is less than the wire length C, and B≤C-2*A.

[0064] Preferably, the ice-coating support plate 2 is made of steel plate with a thickness D ≥ 3 mm, the wire slot bracket 9 is made of epoxy resin, the wire is an aluminum stranded wire, the test wire diameter E ≥ 30 mm, and the test wire length C ≥ 10*E mm.

[0065] The structure of the wire slot bracket 9 is as follows: Figure 4 As shown, the wire slot bracket 9 is designed with a semicircular groove for placing and fixing the wire. The diameter of the semicircular groove is the same as the length of the wire diameter E, and the depth of the semicircular groove is F=E / 2-D. The ice-coating tray 2 is designed with 4 trapezoidal grooves, and each wire slot bracket 9 is designed with 2 trapezoidal protrusions. The grooves and protrusions are used to fix and limit the ice-coating tray 2 and the wire slot bracket 9. The wire slot bracket 9 and the ice-coating tray 2 can be moved in a direction perpendicular to the wire slot bracket 9. After the wire slot bracket 9 and the ice-coating tray 2 are stacked, they cannot move or rotate relative to each other in the horizontal direction. Through the design of the trapezoidal protrusions and grooves, they can be separated from the wire slot bracket 9 after the tray and the wire are iced. Each wire slot bracket 9 is used in conjunction with two ice-coating trays 2, and the installation method is as follows Figure 3 shown.

[0066] The clamping fixture 5 is used to clamp the ice-covered support plate 2, and its structure is as follows: Figure 5 The lower end hooks of the clamping fixture 5 are symmetrically L-shaped. The distance between the two symmetrical L-shaped hooks can be adjusted continuously by a screw to accommodate ice trays of different sizes. The clamping fixture 5 is connected to the tensile testing machine via an upper through-hole.

[0067] The tensile testing machine 6 is used to provide the pulling force required to remove the ice from the surface of the conductor. The conductor fixing fixture 1 is installed at the bottom of the tensile testing machine 6, and the conductor is fixed to the bottom of the tensile testing machine 6 by clamping the semicircular clamp 101. The upper pulling structure of the tensile testing machine 6 is connected to the clamping fixture 5, and the tension is transmitted to the ice-covered support plate 2 through the clamping fixture 5, thereby peeling the ice off the conductor surface as a whole. The stepping speed of the tensile testing machine 6 is controlled by the tensile testing machine stepping control system 7. Preferably, the tensile testing machine can apply tension at a moving speed of 0.5mm / min to 12mm / min.

[0068] The tensile testing machine's stepper control system controls the rotation of the electrodes inside the machine, driving the vertical movement of the clamping fixture 5. This clamping fixture transmits the tensile force to the ice-covered surface. The tensile testing machine's stepper control system 7 is equipped with a tensile force detection module for real-time tensile force measurement. This control system also controls the speed at which the tensile testing machine 6 is raised, ensuring a uniform and gentle increase in tensile force, minimizing measurement errors.

[0069] The data processing module 8, such as an industrial computer, communicates in real time with the stepping control system 7 of the tensile testing machine, controls the up and down movement of the fixture, measures the tensile force in real time, outputs the mechanical curve of the ice detaching from the conductor surface, and records the tensile force value in G at the moment the ice peels off the conductor.

[0070] The test method process is as follows Figure 7 As shown, the specific steps include:

[0071] Step S1. Test sample preparation. Place the conductor in the ice-coating mold (in the semicircular groove of the conductor holder 9, with two ice-coating support plates 2 placed next to the conductor. The grooves of the ice-coating support plates 2 cooperate with the trapezoidal protrusions of the conductor holder 9 for fixation). Ice coating is carried out in an artificial climate chamber using a spraying method to coat the ice-coating support plates 2 and the conductor. The ice coating diagram is shown in the figure below. Figure 6 shown.

[0072] Preferably, to reduce errors, the length of the test wire is 30 cm ≤ C ≤ 60 cm.

[0073] Icing is carried out in the artificial climate chamber, and supercooled water droplets are sprayed out through the nozzle, hitting the wire and the surface of the ice-coating support plate 2 in a single direction from above the wire, forming ice on the wire and the ice-coating support plate 2. Due to the shielding of the wire and the ice-coating support plate 2 and the water droplets being in a supercooled state, the water droplets will freeze immediately after hitting the wire and the surface of the ice-coating support plate 2, and no ice layer will adhere to the wire slot bracket 9. After the icing is completed, the wire slot bracket 9 can be separated from the ice-coating support plate 2.

[0074] After the conductor is iced, the ice on the conductor that is longer than the outside of the ice-covered supporting plate 2 is removed, leaving only the ice between the ice-covered supporting plate 2 and the conductor.

[0075] Preferably, the environmental chamber is controlled to cool to -3°C at a rate of 0.5°C / min to 5°C / min and maintained there for at least 1 hour. The ice temperature during the tensile test is -3°C.

[0076] Step S2. Test Setup. Separate the wire holder bracket 9 from the ice-coating support plate 2 and the test wire in the prepared test sample. Secure both ends of the wire to the wire fixing fixture 1 of the tensile testing machine. Engage the fixture around the ice-coating support plate 2, securing the wire and ice-coating support plate 2 to the force-applying components of the tensile testing machine.

[0077] After the wire slot bracket 9 is separated from the ice-covered support plate 2 and the test wire, the wire and the ice-covered support plate 2 are fixed together by the ice due to the bonding effect of the ice. The wire is fixed on the wire fixing fixture 1 to ensure that the wire is in a horizontal state.

[0078] Preferably, the test is carried out in an artificial climate chamber with the temperature set at -3°C to prevent ice from melting and reduce errors.

[0079] Step S3. Ice peeling test. The industrial computer configures the test plan and uses the tensile testing machine's stepper control system to control the vertical movement of the clamping fixture 5 to change the tension value. The industrial computer is turned on and initialized. The tension sensor's detection value is set to 0. The industrial computer then measures the tension sensor's value in real time. When ice peels off the conductor surface, the tension value G is automatically recorded and a data graph of the tension growth is generated.

[0080] During the test, the conductor does not show obvious bending under the action of the tension on the conductor fixing fixture 1.

[0081] Preferably, the tension is applied at step speeds of 3 mm / min, 6 mm / min, and 9 mm / min, respectively, and each step speed is tested 3 times.

[0082] Step S4. Calculate the ice adhesion strength. Following the above steps, apply tension to peel the ice from the conductor. After the test, measure the combined weight H of the peeled ice and the ice support plate. Calculate the area of ​​ice peeled after peeling, denoting it as I. Calculate the ice adhesion strength M at this point based on the mechanical value and the measured area using the following formula:

[0083]

[0084] Calculation of the area of ​​ice peeling. After the ice is peeled off from the conductor, observe whether the interface is completely separated. If the ice is completely separated, the area I is the ice area of ​​the conductor, that is:

[0085]

[0086] Where E is the wire diameter, and B is the length of the ice covering support plate and the wire slot bracket.

[0087] If the ice is not completely separated from the conductor, the actual ice area removed is calculated by taking images.

[0088] In summary, the present invention provides an apparatus and method for testing the ice adhesion strength of overhead power transmission lines, enabling accurate and reliable testing of the ice adhesion strength of overhead power transmission lines. The present invention has the following significant advantages:

[0089] (1) A device for measuring the bonding strength of conductor ice coating is provided, and an ice coating mold is designed to provide an effective solution for accurately measuring the bonding strength of conductor ice coating.

[0090] (2) Measuring ice adhesion by using the synergistic effect of the ice coating mold, clamping fixture, and wire fixing fixture is beneficial to improving measurement accuracy.

[0091] (3) The bonding strength was calculated based on the ice peeling force and the peeling area, thus achieving the quantification of the bonding performance.

[0092] (4) When the device tests the bonding strength, the ice-covered fixture is evenly stressed and the test data is highly repeatable, thus avoiding errors caused by accidental situations and making the test more accurate.

[0093] 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. An overhead transmission line ice adhesion strength testing device, characterized in that: include: Conductor fixing fixture, used to fix both ends of the overhead conductor; An ice-coating mold includes a detachable ice-coating support plate and a wire slot bracket. When the ice-coating support plate is combined with the wire slot bracket, the ice-coating support plate covers the area of ​​the wire slot bracket except the wire slot and closely adheres to the surface of the overhead wire placed in the wire slot to form an ice-coating area. A clamping fixture, the lower end of which is provided with symmetrical L-shaped hook claws with adjustable spacing, for clamping the ice-covered support plate, and the upper part of the clamping fixture is connected to the tensile testing machine; A tensile testing machine, connected to the clamping fixture, for applying an upward tensile force so that the ice-coated supporting plate drives the ice to peel off the surface of the overhead wire; The stepping control system of the tensile testing machine is used to control the movement of the tensile testing machine and detect the tensile force value in real time; The data processing module communicates with the stepping control system of the tensile testing machine, and is used to record the peak tension at the moment of ice peeling, and calculate the ice adhesion strength according to the peak tension and the ice peeling area.

2. The device for testing ice adhesion strength of overhead power transmission lines according to claim 1, wherein: The conductor fixing fixture includes a semicircular clamp and a fixing base. The fixing base is provided with a semicircular groove matching the diameter of the overhead conductor, and the semicircular clamp is connected by bolts to clamp the overhead conductor.

3. The device for testing ice adhesion strength of overhead power transmission lines according to claim 1, wherein: The ice-coating support plate is made of metal, and the wire slot bracket is made of epoxy resin. The lengths of both are smaller than the lengths of the overhead wires and are arranged in parallel with the overhead wires.

4. The device for testing ice adhesion strength of overhead power transmission lines according to claim 1, wherein: A trapezoidal groove is provided on the lower surface of the ice-coating support plate, and a trapezoidal protrusion is provided on the upper surface of the wire slot bracket for matching with the trapezoidal groove. When the ice-coating support plate and the wire slot bracket are combined, they are limited and fixed by the trapezoidal groove and the trapezoidal protrusion.

5. The device for testing ice adhesion strength of overhead power transmission lines according to any one of claims 1 to 4, characterized in that: The symmetrical L-shaped hooks of the clamping fixture are arranged in a structure with adjustable spacing.

6. A method for testing the ice-coated bond strength of an overhead power transmission line, using the ice-coated bond strength testing device for an overhead power transmission line according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Test Sample Preparation: Overhead conductors were placed in an ice-coating mold. Ice was formed on the conductors and the surface of the ice-coating plate by spraying supercooled water in an artificial climate chamber. The ice that extended beyond the ice-coating plate was then removed. S2. Test Setup: Secure both ends of the iced conductor to the conductor fixture. Clamp the ice-coated support plate with a clamp and connect it to the tensile testing machine. S3. Ice peeling test: The tensile testing machine's stepper control system applies tension to the clamping fixture at a set speed, and the peak tensile force at the moment of ice peeling is recorded in real time. S4. Bond strength calculation: Calculate the ice bond strength based on the peak tensile force and the ice peeling area.

7. The testing method according to claim 6, wherein: In step S1, the ambient temperature is reduced to -3°C at a rate of 0.5°C / min to 5°C / min and maintained for at least 1 hour; in step S3, the ice temperature during the tensile test is -3°C.

8. The testing method according to claim 6, wherein: In step S3, the moving speed range of the tensile testing machine is 0.5 mm / min to 12 mm / min, and uniform tension is applied through the tensile testing machine step control system; wherein the tension application speed includes 3 mm / min, 6 mm / min and 9 mm / min, and each speed is tested 3 times.

9. The testing method according to claim 6, wherein: In step S4, when the ice is completely separated, the geometric area of ​​the conductor ice region is used as the ice peeling area. When the ice is not completely separated, the actual ice peeling area is calculated by taking an image.

10. The testing method according to any one of claims 6 to 9, characterized in that: In step S4, the ice adhesion strength is calculated according to the following formula: ； Where M is the ice adhesion strength, G is the peak tensile force, H is the total weight of the peeled ice and the ice support plate, and I is the ice peeling area.

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