Large-deflection test device and method for measuring anti-galloping effect of phase-to-phase spacer

Abstract

The invention discloses a large-deflection test device and method for measuring the anti-galloping effect of phase-to-phase spacers. The device comprises a frame, and movable cross beams used for connecting the two ends of the phase-to-phase spacers are installed at the upper end and the lower end of the frame; the movable cross beams have translational freedom degrees in the vertical direction and can move up and down in a test, the movable cross beams at the upper end and the lower end are connected through steel wire ropes, the distance between the movable cross beams at the upper end and the lower end is adjusted by adjusting tension in the steel wire ropes, and different bending deflections of spacing rods are measured. According to the invention, a multi-stage dynamic load loading technology is adopted, nonlinear large-deflection deformation characteristics of the wire under complex conditions of strong wind, icing and the like can be simulated, the maximum deflection range of the test covers 60%-80% of an actual galloping amplitude, and compared with a traditional small-deflection test, the simulation authenticity is remarkably improved, and a more reliable basis is provided for anti-galloping performance evaluation.

Description

Technical Field

[0001] This invention relates to a large deflection test device and method for measuring the anti-galling effect of phase-to-phase spacer bars, belonging to the field of power transmission safety technology. Background Technology

[0002] In high-voltage transmission line operation, phase-to-phase spacers are crucial devices for suppressing conductor galloping, and their anti-galloping performance directly affects the safety and stability of the transmission line. Galloping can lead to conductor strand breakage, hardware damage, and even tower collapse, especially under complex conditions such as ultra-high voltage and long-span transmission lines, which place higher demands on the anti-galloping performance of phase-to-phase spacers. Currently, the industry mainly uses small deflection tests to evaluate spacer performance. These methods can only reflect the mechanical characteristics of the device under small deformation conditions and cannot accurately simulate the large deflection deformation characteristics of conductors under dynamic loads such as strong winds and icing in actual operation. These problems lead to significant deviations between test results and actual anti-galloping effects, potentially causing safety hazards such as improper spacer selection and unreasonable installation spacing design. There is an urgent need to develop test methods that can truly reflect the large deflection characteristics under complex operating conditions. Summary of the Invention

[0003] This invention addresses the shortcomings of existing methods for testing the anti-galling performance of interphase spacers by proposing a large deflection test device and method for measuring the anti-galling effect of interphase spacers. It aims to solve the technical problem of mismatch between small deflection test systems and real working conditions, and can be used in conjunction with finite element numerical simulation of interphase spacers to verify the authenticity of simulation results.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] This invention provides a large deflection testing device for measuring the anti-galling effect of interphase spacers, comprising a frame,

[0006] The frame is fitted with movable crossbeams at its upper and lower ends for connecting the two ends of the phase spacers.

[0007] The interphase spacer is mounted on the movable crossbeam by a pin structure, so that the bending deformation of the interphase spacer only occurs in a fixed plane.

[0008] The movable crossbeams have translational freedom in the vertical direction. The movable crossbeams are connected by steel wire ropes. By adjusting the tension in the steel wire ropes, the spacing between the movable crossbeams can be adjusted, and different bending deflections of the spacer bars can be measured.

[0009] Preferably, a pressure sensor is installed on the movable crossbeam to measure the axial pressure on the interphase spacer.

[0010] Preferably, a pressure sensor is installed on each of the movable crossbeams at the upper and lower ends of the frame;

[0011] The pressure sensor has a pin structure below it, and the end of the phase spacer is installed in the pin structure below the pressure sensor.

[0012] Preferably, the movable crossbeam is bolted to the frame, and the frame is provided with multiple screw holes at different positions. The movable crossbeam is installed on the screw holes at different positions to adjust the distance between the upper and lower movable crossbeams.

[0013] Preferably, the height of the frame structure is at least 1.3 times the length of the interphase spacers.

[0014] Preferably, the movable crossbeams are connected by two steel wire ropes, which are respectively arranged on the left and right sides of the spacer bar.

[0015] Preferably, the two wire ropes are connected to the same tension testing machine to form a closed loop, so that the tension on the two wire ropes is the same.

[0016] Preferably, the pressure sensor is connected to a force display device on the ground via a data cable.

[0017] This invention also provides a large deflection test method for measuring the anti-galling effect of interphase spacer bars, implemented based on the aforementioned large deflection test device for measuring the anti-galling effect of interphase spacer bars, the method comprising:

[0018] S1. Select a phase-to-phase spacer bar sample and obtain the structural height, core rod diameter, self-weight, creepage distance, umbrella diameter, and large umbrella spacing of the phase-to-phase spacer bar sample;

[0019] S2. By adjusting the tension in the wire rope, the position of the movable crossbeam is adjusted so that the pressure on the interphase spacer bar specimen in the initial state is 0.

[0020] S3. Test the interphase spacer bar specimen, and adjust the position of the movable crossbeam by adjusting the tension in the steel wire rope to obtain the interphase spacer bar under different bending deformation states.

[0021] S4. Calculate the axial load and lateral deflection of the spacer bars under different bending deformation states, and plot the axial load-compression distance curve and the lateral deflection-compression distance curve; the compression distance refers to the axial displacement of the spacer bars under axial compressive force.

[0022] Preferably, the test on the interphase spacer bar specimen includes:

[0023] The spacer bar specimen is gradually compressed from its initial state to the maximum compression distance according to the set compression interval. The axial load and lateral deflection of the spacer bar are calculated once for each compression interval.

[0024] Preferably, the maximum compression distance is selected as 8400mm;

[0025] The compression interval was set to 560mm.

[0026] Preferably, the test on the interphase spacer bar specimen further includes:

[0027] The interphase spacer bar specimen was subjected to three consecutive tests, and the average value of the three tests was used to plot the axial load-compression distance curve and the lateral deflection-compression distance curve.

[0028] The beneficial effects achieved by this invention are as follows:

[0029] (1) The present invention adopts multi-level dynamic load loading technology, which can simulate the nonlinear large deflection deformation characteristics of conductors under complex conditions such as strong wind and icing. The maximum deflection range of the test covers 60%-80% of the actual galloping amplitude, which significantly improves the simulation realism compared with the traditional small deflection test and provides a more reliable basis for anti-galloping performance evaluation.

[0030] (2) This invention combines pressure sensor and force value display technology to realize the synchronous measurement of the dynamic response of the axial stiffness of the spacer bar. It can obtain the relationship between the compression amount and lateral deflection and the compressive load, make up for the limitations of traditional single mechanical test, and provide multi-dimensional experimental data support for finite element simulation. Attached Figure Description

[0031] Figure 1 A schematic diagram of the large deflection test device for measuring the anti-galling effect of interphase spacer bars provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the deflection analysis of the interphase spacer provided in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram illustrating the mechanical property analysis of the interphase spacer provided in an embodiment of the present invention;

[0034] Figure 4 A schematic diagram illustrating the mechanical property analysis of a single unit segment of an interphase spacer provided in an embodiment of the present invention;

[0035] Figure 5(a) and (b) are comparison diagrams of the test results and finite element simulation results of the No. 1 interphase spacer bar specimen in this invention; Figure 5(a) is a comparison diagram of the test results and finite element simulation results of the axial load of the No. 1 interphase spacer bar specimen; Figure 5(b) is a comparison diagram of the test results and finite element simulation results of the lateral deflection at the midpoint of the No. 1 interphase spacer bar specimen.

[0036] Figure 6(a) and (b) are comparison diagrams of the test results and finite element simulation results of the No. 2 interphase spacer bar specimen in this invention; Figure 6(a) is a comparison diagram of the test results and finite element simulation results of the axial load of the No. 2 interphase spacer bar specimen; Figure 6(b) is a comparison diagram of the test results and finite element simulation results of the lateral deflection at the midpoint of the No. 2 interphase spacer bar specimen.

[0037] Figure 7(a) and (b) are comparison diagrams of the test results and finite element simulation results of the No. 3 interphase spacer bar specimen in this invention; Figure 7(a) is a comparison diagram of the test results and finite element simulation results of the axial load of the No. 3 interphase spacer bar specimen; Figure 7(b) is a comparison diagram of the test results and finite element simulation results of the lateral deflection at the midpoint of the No. 3 interphase spacer bar specimen. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0039] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0040] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence or addition of one or more other features, elements, steps, or components.

[0041] It should also be noted that, unless otherwise specified, the term "connection" in this article can refer not only to a direct connection, but also to an indirect connection involving an intermediary.

[0042] It should be emphasized here that the step markers mentioned below are not a limitation on the order of the steps, but should be understood as meaning that the steps can be executed in the order mentioned in the embodiments, or in a different order than in the embodiments, or several steps can be executed simultaneously.

[0043] In actual operating lines, the phase spacers and the sub-spacers of the fixed split conductors are connected by ball joint hardware to ensure that the phase spacers only bear axial forces. Since the ball joint can rotate in any direction, the phase spacers can buckle in any plane. In the experiment, for ease of measurement, a one-way hinge-pin structure was used instead of the ball joint structure to ensure that the buckling deformation of the phase spacers only occurs within a defined plane.

[0044] Based on the above-mentioned inventive concept, the present invention provides a large deflection test device for measuring the anti-ghosting effect of interphase spacers. Figure 1 A schematic diagram of the large deflection test device for measuring the anti-galling effect of interphase spacers provided by the present invention. (Refer to...) Figure 1 The present invention provides a large deflection test device for measuring the anti-ghosting effect of interphase spacers, comprising a frame 5, wherein movable crossbeams 1 for connecting the two ends of interphase spacers are installed at the upper and lower ends of the frame 5.

[0045] In this invention, a pressure sensor 2 is installed on each of the movable crossbeams 1 at the upper and lower ends of the frame 5. A pin structure is provided below the pressure sensor 2, and the ends of the interphase spacer bars 3 are mounted on the movable crossbeams 1 via the pin structure, ensuring that the bending deformation of the interphase spacer bars 3 occurs only within a fixed plane. This minimizes measurement errors. The pressure sensor 2 is connected to a force display device on the ground via a data cable to observe the axial pressure on the interphase spacer bars 3. The pressure sensor 2 and the force display device play an auxiliary role in the deflection measurement test, especially at the initial stage of the test, ensuring that the pressure on the interphase spacer bar specimen is zero. In this invention, the movable crossbeams 1 are bolted to the frame 5. The frame has multiple screw holes at different positions. Installing the movable crossbeams 1 on these screw holes allows adjustment of the distance between the upper and lower movable crossbeams 1, giving the movable crossbeams 1 a vertical translational degree of freedom. This invention uses a bolted connection method, which is convenient for operation and implementation.

[0046] In this invention, the movable crossbeams 1 are connected by steel wire ropes 4. By adjusting the tension in the steel wire ropes 4, the spacing between the movable crossbeams 1 can be adjusted. Then, the movable crossbeams 1 are installed on the screw holes at the corresponding positions to measure the different bending deflections of the spacers between phases.

[0047] Furthermore, the movable crossbeams 1 are connected by two steel wire ropes 4, which are respectively arranged on the left and right sides of the spacer bar 3. Using two steel wire ropes 4 can make the tensioning process more stable and prevent the movable crossbeams 1 from swaying or shifting. It should be noted that the two steel wire ropes 4 are connected to the same tensioning machine to form a closed loop, so that the tension on the two steel wire ropes 4 is the same.

[0048] It should be noted that the height of frame 5 is at least 1.3 times the length of the interphase spacer 3. The height of frame 5 should be greater than the length of the interphase spacer 3, especially with space reserved at the lower end to facilitate the installation and fixation of the frame on the ground, as well as the installation of the movable crossbeam.

[0049] like Figure 1As shown, this is a specific implementation case based on the above technical solution, which provides a large deflection test device for measuring the anti-galling effect of the phase spacer. The test device uses a channel steel frame, the structural height of which is 1.3 times the length of the phase spacer. Movable crossbeams 1 for connecting the two ends of the phase spacer are installed at the upper and lower ends of the channel steel frame 5.

[0050] The movable crossbeam 1 at the top and bottom has a vertical translational degree of freedom, allowing it to move up and down during the experiment. The movable crossbeam 1 is bolted to the channel steel frame 5, which has multiple bolt holes in different positions to accommodate the movement of the movable crossbeam 1.

[0051] Two steel wire ropes 4 connect the upper and lower movable crossbeams 1, respectively arranged on the left and right sides of the interphase spacer 3. The steel wire ropes need to have high tensile strength and stiffness to meet the requirements of large deflection bending of the interphase spacer. By adjusting the tension in the steel wire ropes, the distance between the upper and lower movable crossbeams can be adjusted, thereby enabling the measurement of different bending deflections of the interphase spacer. The two steel wire ropes are connected to the same tensile testing machine, forming a closed loop. The tension on the steel wire ropes is consistent throughout, effectively making them a single rope, thus ensuring that the tension of the steel wire ropes on both sides is the same.

[0052] A pressure sensor 2 is installed on each of the upper and lower movable crossbeams 1. The pressure sensor 2 is used to measure the axial pressure on the interphase spacer bars and is connected to a force display device on the ground via a data cable. In this implementation case, a spoke-type LFSC-10kN high-precision pressure sensor manufactured by Ningbo Keli Electric Co., Ltd. is used, and the force display device is an FB510 type 5-digit digital force display.

[0053] The pressure sensor 2 has a pin structure below it, and the spacer bar 3 is placed between the two movable crossbeams 1, with its end installed in the pin structure below the pressure sensor 2.

[0054] The beneficial effects achieved by this invention are as follows:

[0055] (1) The present invention adopts multi-level dynamic load loading technology, which can simulate the nonlinear large deflection deformation characteristics of conductors under complex conditions such as strong wind and icing. The maximum deflection range of the test covers 60%-80% of the actual galloping amplitude, which significantly improves the simulation realism compared with the traditional small deflection test and provides a more reliable basis for anti-galloping performance evaluation.

[0056] (2) This invention combines pressure sensor and force value display technology to realize the synchronous measurement of the dynamic response of the axial stiffness of the spacer bar. It can obtain the relationship between the compression amount and lateral deflection and the compressive load, make up for the limitations of traditional single mechanical test, and provide multi-dimensional experimental data support for finite element simulation.

[0057] The present invention employs the aforementioned large deflection testing device for measuring the anti-galling effect of interphase spacer bars to conduct a large deflection test method, comprising the following steps:

[0058] S1. Select the interphase spacer bar specimen and obtain the structural height, core bar diameter, self-weight, creepage distance, umbrella diameter and large umbrella spacing of the interphase spacer bar specimen;

[0059] S2. By adjusting the tension in the wire rope, adjust the position of the movable crossbeam so that the pressure on the interphase spacer bar specimen in the initial state is 0.

[0060] S3. Test the interphase spacer bar specimens. Adjust the position of the movable crossbeam by adjusting the tension in the wire rope to obtain the interphase spacer bars under different bending deformation states.

[0061] S4. Calculate the axial load and lateral deflection of the spacer bars under different bending deformation states, and plot the axial load-compression distance curve and the lateral deflection-compression distance curve; where the compression distance refers to the axial displacement of the spacer bars under axial compressive force.

[0062] In this invention, the axial load and lateral deflection are calculated as follows:

[0063] See Figure 2 The diagram shows the deflection of the interphase spacer. Deflection is defined as the linear displacement of the interphase spacer perpendicular to the axis when it is subjected to an axial force.

[0064] Establish Ws coordinates, starting from the origin, and extract... The arc length and the forces acting on it are shown in Figure (b) on the right. Based on the equilibrium condition:

[0065] (1)

[0066] Indicates bending moment, This represents the axial load perpendicular to the cross-section. For deflection.

[0067] Based on the static equations, the post-buckling curvature is obtained, which can be written as:

[0068] (2)

[0069] Indicates curvature. Indicates the radius of curvature. This represents the elastic modulus of the spacer bars. Represents the moment of inertia of the cross section. This indicates the angle between the tangent corresponding to the arc length and the axial direction of the spacer bar.

[0070] Substitute equation (2) into equation (1) and assume ,

[0071] The nonlinear equation for buckling is obtained:

[0072] (3)

[0073] use The equation becomes:

[0074] (4)

[0075] To solve the nonlinear equation (4), assume Then we have:

[0076] (5)

[0077] Substituting equation (5) into equation (4) and integrating, we get:

[0078] (6)

[0079] in As a constant, using boundary conditions: the endpoint bending moment is zero, i.e., the curvature is zero, that is... hour, Therefore, we can conclude that:

[0080] (7)

[0081] Substituting equation (7) into equation (6), we get:

[0082] (8)

[0083] The "-" sign in the formula represents the coordinate system. The negative value is chosen. Integrating equation (8), we get:

[0084] (9)

[0085] in Let be the integration constant, from To determine:

[0086] (10)

[0087] when hour, Substituting into equation (10), we get:

[0088] (11)

[0089] Indicates the position on the phase spacer. This indicates the length of the spacer bars between phases.

[0090] The integral in this expression can be transformed into an elliptic integral form through the following transformation:

[0091] make: , (12)

[0092] Angles are used in mathematical transformations of elliptic integrals.

[0093] Then equation (11) becomes:

[0094] (13)

[0095] Therefore, equation (9) becomes:

[0096] (14)

[0097] The first and second terms on the right side of the equation are the complete elliptic integral of the first kind and the elliptic integral of the first kind, respectively, which are expressed using... and This means, that is:

[0098] (15)

[0099] To determine the relationship between the lateral deflection at the midpoint of the interphase spacer bar and the axial compression distance, the following method is used:

[0100] (16)

[0101] Pair both sides of equation (16) Differentiate, then:

[0102] (17)

[0103] and It can be expressed as:

[0104] (18)

[0105] (19)

[0106] Integrating equations (18) and (19) respectively, we get:

[0107] (20)

[0108] (twenty one)

[0109] Equation (20) can be used to calculate the axial compression distance of the interphase spacer, while Equation (21) can be used to obtain the lateral deflection of the interphase spacer at the center point of the composite insulator. Then we have:

[0110] (twenty two)

[0111] Written in dimensionless form:

[0112] (twenty three)

[0113] The load is also written in dimensionless form:

[0114] (twenty four)

[0115] The critical axial load at which the interphase spacer undergoes buckling deformation refers to the magnitude of the load.

[0116] In order to introduce a numerical calculation model for the mechanical properties of interphase spacers under complex stress conditions, the following assumptions are first made:

[0117] (1) Since the main structure that determines the mechanical properties of the interphase spacer is its core rod, the influence of the umbrella skirt sheath on the mechanical properties is ignored, and the interphase spacer is considered to be a slender rod with a uniform circular cross section.

[0118] (2) The external forces on the interphase spacer are the loads at its two ends (including force and bending moment) and the gravity distributed load along the axial direction;

[0119] (3) The mechanical parameters of the mandrel material are isotropic, and the stress and strain satisfy a linear relationship.

[0120] Numerical calculation model of mechanical properties of interphase spacer bars, such as Figure 3 As shown, let its original length be... Self-respect Divide the interphase spacers into equal parts. If there are multiple unit segments, then the length of each unit segment is... (in ),gravity The forces in the x and y directions of the interphase spacer bars are and The bending moments at both ends are and .

[0121] Assume the diameter of the interphase spacer is If the shape is uniform and circular everywhere, then the cross-sectional area is... The moment of inertia of the cross section is .

[0122] After dividing the model into equal parts, the first... The forces acting on a unit segment are as follows Figure 4 As shown, the local equilibrium condition can be obtained as follows:

[0123] (25)

[0124] (26)

[0125] (27)

[0126] and They are the interphase spacers. Forces in the x and y directions of the unit segment, For the interphase spacer bar Bending moment of unit segment For the interphase spacer bar The angle between the unit segment and the X-axis.

[0127] Based on the local equilibrium condition solution model, the maximum tensile stress and compressive stress of each section are obtained as follows:

[0128] (28)

[0129] (29)

[0130] (30)

[0131] in and They are the interphase spacers. The maximum tensile and compressive stresses of the unit section. For the interphase spacer bar Axial force of the unit segment. Axial force can be considered a quantity representing axial load. Changes in axial force can reflect changes in axial load. In this case, the values ​​of the two quantities can be considered to be the same.

[0132] In a preferred embodiment, step S3 involves testing the interphase spacer bar sample, including:

[0133] The spacer bar specimen is gradually compressed from its initial state to the maximum compression distance according to a set compression interval. The axial load and lateral deflection of the spacer bar are calculated once for each compression interval. This method can achieve different degrees of bending of the spacer bar specimen, thus realistically reflecting the large deflection characteristics under complex working conditions.

[0134] Preferably, the maximum compression distance can be selected as 8400mm; the set compression interval can be selected as 560mm.

[0135] In a preferred embodiment, in step S3, during the test, the interphase spacer bar specimen is tested three times consecutively in the manner described above, and the average value of the three tests is used to plot the axial load-compression distance curve and the lateral deflection-compression distance curve. Using multiple measurements and averaging minimizes errors.

[0136] Based on the above-mentioned large deflection test method, a large deflection test of the interphase spacer bar was carried out. The specific implementation process is as follows:

[0137] S1. Select three interphase spacer bar specimens with different diameters, and obtain the structural height, core rod diameter, self-weight, creepage distance, umbrella diameter, and large umbrella spacing of the interphase spacer bar specimens. The parameters are shown in Table 1 below.

[0138] Table 1. Parameters of interphase spacer bar specimens

[0139]

[0140] S2. Select the No. 1 interphase spacer bar sample, adjust the tension in the wire rope, and fix the position of the movable crossbeam so that the pressure on the interphase spacer bar is 0 in the initial condition.

[0141] S3. Start the test. Adjust the position of the movable crossbeam by adjusting the tension in the wire rope, so that the interphase spacer bar specimen is gradually compressed from the initial state to the maximum compression distance of 8400mm according to the set compression interval of 560mm, and the interphase spacer bar under different bending deformation states is obtained.

[0142] In this step, the axial load and lateral deflection of the spacer bar specimen are recorded every 560 mm, for a total of 15 data points.

[0143] The above method was used to conduct three consecutive experiments.

[0144] S4. Take the average value of the three tests as the final axial load and lateral deflection data, that is, the axial load and lateral deflection of the spacer bar under different bending deformation states, and plot the axial load-compression distance curve and the lateral deflection-compression distance curve.

[0145] S5. Test the No. 2 and No. 3 interphase spacer specimens using the methods described in S2-S4 above to obtain the axial load and lateral deflection data of the three interphase spacer specimens under different compression distance conditions. Plot the axial load-compression distance curves and lateral deflection-compression distance curves for each specimen, and compare them with the finite element simulation results curves of the interphase spacer specimens in one figure.

[0146] Figure 5(a) shows a comparison between the experimental results and the finite element simulation results of the axial load of the No. 1 interphase spacer bar specimen; Figure 5(b) shows a comparison between the experimental results and the finite element simulation results of the midpoint lateral deflection of the No. 1 interphase spacer bar specimen. It can be seen that the relationship between the midpoint lateral deflection measured by the experiment and the compression distance is very close to the finite element simulation results, while the relationship between the axial compression load measured by the experiment and the compression distance is slightly larger than the finite element simulation results. However, the changing trends of the experimental result curve and the finite element simulation result curve are consistent.

[0147] Figure 6(a) is a comparison of the test results and finite element simulation results of the axial load of the No. 2 interphase spacer bar specimen; Figure 6(b) is a comparison of the test results and finite element simulation results of the midpoint lateral deflection of the No. 2 interphase spacer bar specimen. It can be seen that the relationship between the midpoint lateral deflection measured by the experiment and the compression distance is very close to the finite element simulation results, while the relationship between the axial compression load measured by the experiment and the compression distance is slightly larger than the finite element simulation results. However, the changing trends of the test result curve and the finite element simulation result curve are consistent.

[0148] Figure 7(a) is a comparison of the test results and finite element simulation results of the axial load of the No. 3 interphase spacer bar specimen; Figure 7(b) is a comparison of the test results and finite element simulation results of the midpoint lateral deflection of the No. 3 interphase spacer bar specimen. It can be seen that the relationship between the midpoint lateral deflection measured by the experiment and the compression distance is very close to the finite element simulation results, while the relationship between the axial compression load measured by the experiment and the compression distance is slightly larger than the finite element simulation results. However, the changing trends of the test result curve and the finite element simulation result curve are consistent.

[0149] Regarding the discrepancy between the axial compressive load and the finite element simulation results, considering that the two ends of the interphase spacer slide on the four columns through a plate and come into contact with the pressure sensor, the measured pressure can only be consistent with the load on the two ends of the interphase spacer if the plate is always in a direction parallel to the horizontal plane. However, this is difficult to guarantee during large deflection buckling deformation. If the plate is slightly tilted, the measurement result will contain the horizontal component force, which will lead to the measurement result being too large.

[0150] Comparing the experimental results and the finite element simulation results of the axial load, the deviation between the two is within 5%, which means that the experimental results and the finite element simulation results are consistent. This also proves that the experimental method provided by the present invention is correct and effective.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A large deflection testing device for measuring the anti-galloping effect of interphase spacers, comprising a frame, characterized in that, The frame is fitted with movable crossbeams at its upper and lower ends for connecting the two ends of the phase spacers. The interphase spacer is mounted on the movable crossbeam by a pin structure, so that the bending deformation of the interphase spacer only occurs in a fixed plane. The movable crossbeams have translational freedom in the vertical direction. The movable crossbeams are connected by steel wire ropes. By adjusting the tension in the steel wire ropes, the spacing between the movable crossbeams can be adjusted, and different bending deflections of the spacer bars can be measured.

2. The large deflection test device for measuring the anti-galloping effect of interphase spacer bars according to claim 1, characterized in that, A pressure sensor is installed on the movable crossbeam to measure the axial pressure on the interphase spacer bars.

3. The large deflection test device for measuring the anti-galloping effect of interphase spacer bars according to claim 2, characterized in that, A pressure sensor is installed on each of the movable crossbeams at the upper and lower ends of the frame. The pressure sensor has a pin structure below it, and the end of the phase spacer is installed in the pin structure below the pressure sensor.

4. The large deflection test device for measuring the anti-galling effect of interphase spacers according to claim 1, characterized in that, The movable crossbeam is bolted to the frame, and the frame has multiple screw holes at different positions. The movable crossbeam is installed on the screw holes at different positions to adjust the distance between the upper and lower movable crossbeams.

5. The large deflection test device for measuring the anti-galling effect of interphase spacer bars according to claim 1, characterized in that, The height of the frame structure is at least 1.3 times the length of the interphase spacers.

6. The large deflection test device for measuring the anti-galling effect of interphase spacer bars according to claim 1, characterized in that, The movable crossbeams are connected by two steel wire ropes, which are respectively arranged on the left and right sides of the phase spacer.

7. A large deflection test device for measuring the anti-galloping effect of interphase spacer bars according to claim 6, characterized in that, The two steel wire ropes are connected to the same tensile testing machine to form a closed loop, so that the tension on the two steel wire ropes is the same.

8. The large deflection test device for measuring the anti-galling effect of interphase spacer bars according to claim 1, characterized in that, The pressure sensor is connected to a force display device on the ground via a data cable.

9. A large deflection test method for measuring the anti-galloping effect of interphase spacers, characterized in that, The method is based on the large deflection test device for measuring the anti-galling effect of interphase spacer bars as described in any one of claims 1 to 8, and includes: S1. Select a phase-to-phase spacer bar sample and obtain the structural height, core rod diameter, self-weight, creepage distance, umbrella diameter, and large umbrella spacing of the phase-to-phase spacer bar sample; S2. By adjusting the tension in the wire rope, the position of the movable crossbeam is adjusted so that the pressure on the interphase spacer bar specimen in the initial state is 0. S3. Test the interphase spacer bar specimen, and adjust the position of the movable crossbeam by adjusting the tension in the steel wire rope to obtain the interphase spacer bar under different bending deformation states. S4. Calculate the axial load and lateral deflection of the spacer bars under different bending deformation states, and plot the axial load-compression distance curve and the lateral deflection-compression distance curve; the compression distance refers to the axial displacement of the spacer bars under axial compressive force.

10. A large deflection test method for measuring the anti-galling effect of interphase spacer bars according to claim 9, characterized in that, The test on the interphase spacer bar specimen includes: The spacer bar specimen is gradually compressed from its initial state to the maximum compression distance according to the set compression interval. The axial load and lateral deflection of the spacer bar are calculated once for each compression interval.

11. The large deflection test method for measuring the anti-galling effect of interphase spacer bars according to claim 10, characterized in that, The maximum compression distance is selected as 8400 mm; The compression interval was set to 560mm.

12. The large deflection test method for measuring the anti-galling effect of interphase spacer bars according to claim 10, characterized in that, The test of the interphase spacer bar specimen further includes: The interphase spacer bar specimen was subjected to three consecutive tests, and the average value of the three tests was used to plot the axial load-compression distance curve and the lateral deflection-compression distance curve.

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