Performance test method and device for grounding down conductor

Abstract

The present invention provides a performance testing method and device for a grounding down conductor, which can be used in the technical field of material performance testing. The performance testing method includes: based on the structural parameters and pre-buried depth parameters of the target grounding grid and the soil structural parameters of the target area, obtaining the ground settlement force applied to the grounding down conductor to be tested through simulation; adding soil in the target area to a soil test box so that the weight of the soil test box corresponds to the ground settlement force; based on the test requirements, obtaining the dynamic landing strategy of the soil test box during the test; fixing the first end of the grounding down conductor to be tested, and connecting the second end of the grounding down conductor to be tested to the bottom; simulating the ground settlement state of the target area according to the dynamic landing strategy; after each test, measuring the tension data of the first end and the elongation length data of the grounding down conductor to be tested; and obtaining the performance test result of the grounding down conductor by processing the obtained measurement data.

Description

Technical Field

[0001] The invention relates to the technical field of material performance testing, and in particular to a performance testing method and device for a grounding down conductor. Background Art

[0002] Ground subsidence refers to the phenomenon of lowering of ground elevation in a region under the influence of natural factors and human activities. The relationship between ground subsidence and building damage is spatially variable and depends on the influence of factors such as groundwater exploitation, geological structure, soil compression, and building structure. When ground subsidence is more serious, it will cause cracks, tilting, and damage to buildings, as well as damage and failure of power facilities and transmission lines. When ground subsidence occurs, when the settlement rate of ground structures is less than the settlement rate of the grounding grid, the grounding conductor will be affected by stress corrosion. When it reaches a certain level, stress corrosion fracture of the grounding conductor will occur, leading to the occurrence of power transmission and transformation accidents.

[0003] The flexible connection structure of the grounding down conductor is usually made of galvanized steel (hot-dip galvanized flat steel or round steel) or copper (copper busbar or copper rod). When the ground subsides, the flexible connection structure of the grounding down conductor should be able to stretch with the ground subsidence to prevent the grounding down conductor from being subjected to too much force or being broken. For flexible connection structures of different materials and sizes, the force required to stretch with ground subsidence is different. For this reason, it is necessary to test the flexibility of the flexible connection structure of the grounding down conductor. However, there is currently no test device and method for simulating the performance of the flexible connection structure of the grounding down conductor under ground subsidence conditions. Summary of the invention

[0004] In view of this, the present invention provides a method and device for testing the performance of a grounding down conductor.

[0005] According to one aspect of the present invention, a performance test method for a grounding down conductor is provided, comprising: based on the structural parameters of a target grounding grid, the soil structural parameters of a target area, and the pre-buried depth parameters of the target grounding grid, obtaining through simulation the ground settlement force applied by the target area to the grounding down conductor to be tested of the target grounding grid when ground settlement occurs; adding soil in the target area to a soil test box so that the weight of the soil test box corresponds to the ground settlement force; based on the test requirements, obtaining the ground settlement force according to the average ground settlement speed of the target area, the scheduled use time of the grounding down conductor to be tested, and the scheduled landing interval time. The invention relates to a dynamic descending strategy for a soil test box during the test; fixing the first end of the grounding down conductor to be tested, and connecting the second end of the grounding down conductor to be tested through the internal soil of the soil test box and the bottom; controlling the dynamic descending of the soil test box according to the dynamic descending strategy to simulate the ground settlement state of the target area; measuring and obtaining the tension data of the first end and the elongation length data of the grounding down conductor to be tested after each descent of the soil test box and a predetermined descent interval; and obtaining the performance test result of the grounding down conductor by processing multiple groups of tension data of the first end and the elongation length data of the grounding down conductor to be tested.

[0006] According to an embodiment of the present invention, based on the test requirements, according to the average ground settlement rate of the target area, the scheduled usage time of the grounding lead to be tested and the scheduled landing interval time, a dynamic landing strategy of the soil test box during the test process is obtained, including: obtaining the target landing height according to the average ground settlement rate and the scheduled usage time; and determining the dynamic landing strategy according to the target landing height and the scheduled landing interval time based on the test requirements.

[0007] According to an embodiment of the present invention, based on the test requirements, a dynamic landing strategy is determined according to the target landing altitude and the predetermined landing interval duration, including: based on the test requirements, determining a first test duration; obtaining a first landing speed according to the target landing altitude and the first test duration; obtaining a first number of landings according to the first test duration and the predetermined landing interval duration; and obtaining a first dynamic landing strategy according to the target landing altitude, the first landing speed, the first number of landings and the predetermined landing interval duration.

[0008] According to an embodiment of the present invention, the above performance testing method further includes: after a first test time, performing a corrosion test on the ground down conductor to be tested to obtain corrosion status data.

[0009] According to an embodiment of the present invention, based on the test requirements, a dynamic landing strategy is determined according to the target landing height and the predetermined landing interval duration, including: determining each landing height based on the test requirements; obtaining a second test duration according to the target landing height, each landing height and the predetermined landing interval duration; obtaining a second landing speed according to the second test duration and the target landing height; and obtaining a second dynamic landing strategy according to the second landing speed, each landing height, the target landing height and the predetermined landing interval duration.

[0010] According to an embodiment of the present invention, a performance test result of a grounding down conductor is obtained by processing multiple groups of tension data of the first end and elongation length data of the grounding down conductor to be tested; a stretching curve diagram of the grounding down conductor to be tested is plotted based on multiple groups of tension data of the first end and elongation length data of the grounding down conductor to be tested; a target elongation length is calculated according to the structural parameters of the grounding down conductor to be tested; a target tension corresponding to the target elongation length is queried from the stretching curve diagram; and a flexibility index of the grounding down conductor to be tested is obtained according to the target tension and the ground settlement force.

[0011] According to an embodiment of the present invention, the performance testing method further comprises: obtaining the flexibility of the grounding down conductor to be tested according to the elongation length of the grounding down conductor to be tested under the action of ground settlement force and the target elongation length.

[0012] According to another aspect of the present invention, there is provided a performance testing device for a grounding down conductor used in the above-mentioned testing method, comprising: a crossbeam, the crossbeam being connected to the first end of the grounding down conductor to be tested via a first fixing member; a soil test box, the bottom inner wall of the soil test box being connected to the second end of the grounding down conductor to be tested via a second fixing member; a traction mechanism, one end of the traction mechanism being connected to the crossbeam, and the other end of the traction mechanism being connected to the side wall of the soil test box, for controlling the descent of the soil test box; a dynamometer being arranged on the first fixing member, for measuring the tension at the first end during the descent of the soil test box.

[0013] According to an embodiment of the present invention, a first lifting lug is provided on the crossbeam; a second lifting lug is provided on the side wall of the soil test box; one end of the traction mechanism is connected to the first lifting lug; and the other end of the traction mechanism is connected to the second lifting lug.

[0014] According to an embodiment of the present invention, the device also includes: a bracket, which is arranged at both ends of the beam and is used to support the beam; a base, which is fixedly connected to the bracket; and a plurality of gaskets, which are movably arranged between the soil test box and the base; wherein the thickness of each gasket is less than or equal to the falling height of the soil test box each time.

[0015] According to an embodiment of the present invention, by simulating and calculating the parameters of the target grounding grid and the soil in the target area, the ground settlement force applied to the grounding down conductor to be tested of the target grounding grid is obtained, and then the weight of the soil test box is determined. Based on the actual performance test requirements, according to the parameters required for the test of the target area, the dynamic landing strategy of the soil test box during the test is obtained. According to the dynamic landing strategy, the ground settlement state of the target area is simulated, and the force change of the grounding down conductor in the face of ground settlement is tested under this simulation condition to obtain tension data and elongation length data, and the performance test results of the grounding down conductor are obtained by processing the above data. Therefore, the performance test method and device of the grounding down conductor provided by the present invention can effectively simulate soil conditions, perform performance tests on the flexible connection structure of the grounding down conductor, fill the gap in the performance test method of the grounding down conductor, and realize the construction of the performance test method and device of the grounding down conductor. The method can effectively deal with the corrosion behavior of the grounding down conductor, save time and economic costs for the prevention of power grid disasters, and provide a scientific basis for power grid system planning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 A flow chart of a method for testing the performance of a ground down conductor according to an embodiment of the present invention is shown;

[0018] Figure 2 A schematic diagram of a horizontal ground grid model according to an embodiment of the present invention is shown;

[0019] Figure 3 A cross-sectional view of a performance testing device for a ground down conductor according to an embodiment of the present invention is shown;

[0020] Figure 4 A schematic diagram of the appearance of the flexible connection structure of the ground down conductor to be tested before and after the performance test according to an embodiment of the present invention is shown;

[0021] Figure 5a-5d Optical micrographs of the sample surface at different positions after the performance test of the ground down conductor flexible connection structure according to an embodiment of the present invention are shown;

[0022] Figure 6 A tensile curve diagram of a ground down conductor flexible connection structure according to an embodiment of the present invention is shown;

[0023] Figure 7 A schematic diagram of a flexible connection structure of a ground down conductor according to an embodiment of the present invention is shown;

[0024] Figure 8A schematic diagram of a performance testing device for a ground down conductor according to an embodiment of the present invention is shown;

[0025] Fig. 9 A schematic diagram of a soil test box bracket and a lower fixing member in a performance testing device for a grounding down conductor according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0026] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0027] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0028] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0029] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0030] Ground subsidence refers to the phenomenon that the ground elevation in a region decreases due to natural factors and human activities. When ground subsidence is more serious, it will cause cracks, tilts, and damage to buildings, as well as damage and failures to power facilities and transmission lines. The grounding down conductor is a metal conductor that connects electrical equipment to the grounding grid. As the ground subsides, the grounding down conductor buried in the soil will stretch or even be broken under the action of the settlement force, and will also break due to corrosion. For flexible connection structures of different materials and sizes, the force required to stretch with ground subsidence is different, and the corrosion resistance is also different. Therefore, it is necessary to test the performance of the grounding down conductor, but there is currently no test device and method for simulating the performance of the flexible connection structure of the grounding down conductor under ground subsidence conditions.

[0031] In view of this, an embodiment of the present invention provides a performance test method for a grounding down conductor, by simulating and calculating the parameters of the target grounding grid and the soil in the target area, the ground settlement force applied to the grounding down conductor to be tested of the target grounding grid is obtained, and then the weight of the soil test box is determined. Based on the actual performance test requirements, according to the parameters required for the test of the target area, the dynamic landing strategy of the soil test box during the test is obtained. According to the dynamic landing strategy, the ground settlement state of the target area is simulated, and the force change of the grounding down conductor in the face of ground settlement is tested under this simulation condition to obtain tension data and elongation length data, and the performance test results of the grounding down conductor are obtained by processing the above data. Therefore, the performance test method and device of the grounding down conductor provided by the present invention can effectively simulate soil conditions, perform a performance test of the flexible connection structure of the grounding down conductor, fill the gap in the performance test method of the grounding down conductor, and realize the construction of the performance test method and device of the grounding down conductor. The method can effectively deal with the corrosion behavior of the grounding down conductor, save time and economic costs for the prevention of power grid disasters, and provide a scientific basis for the planning of the power grid system.

[0032] Figure 1 A flow chart of a method for testing the performance of a grounding down conductor according to an embodiment of the present invention is shown.

[0033] like Figure 1 As shown, the performance testing method 100 of the grounding down conductor of this embodiment includes operations S110 to S160.

[0034] In operation S110, based on the structural parameters of the target grounding grid, the soil structural parameters of the target area, and the pre-buried depth parameters of the target grounding grid, the ground settlement force applied to the grounding down conductor to be tested of the target grounding grid when ground settlement occurs in the target area is obtained through simulation.

[0035] In operation S120, soil in the target area is added to the soil test box so that the weight of the soil test box corresponds to ground settlement force.

[0036] In operation S130, based on the test requirements, a dynamic drop strategy of the soil test box during the test is obtained according to the average ground settlement velocity of the target area, the scheduled use time of the ground down conductor to be tested, and the scheduled drop interval time.

[0037] In operation S140, the first end of the grounding down conductor to be tested is fixed, and the second end of the grounding down conductor to be tested is passed through the internal soil of the soil test box and connected to the bottom; according to the dynamic landing strategy, the soil test box is controlled to dynamically land to simulate the ground settlement state of the target area.

[0038] In operation S150, each time the soil test box is lowered and after a predetermined lowering interval has passed, the tension data of the first end and the elongation length data of the grounding down conductor to be tested are measured and obtained.

[0039] In operation S160, a performance test result of the ground down conductor is obtained by processing a plurality of sets of first end tension data and elongation length data of the ground down conductor to be tested.

[0040] According to an embodiment of the present invention, based on the structural parameters of the target grounding grid, the soil structural parameters of the target area, and the pre-buried depth parameters of the target grounding grid, the ground subsidence force is obtained through simulation calculation, and finite element simulation software can be used to calculate the ground subsidence force Fs applied to the grounding down lead during ground subsidence.

[0041] According to an embodiment of the present invention, the target ground grid may be laid horizontally.

[0042] Figure 2 A schematic diagram of a lateral ground grid mesh model 200 according to an embodiment of the present invention is shown.

[0043] like Figure 2 As shown in the figure, the horizontally laid grounding grid and soil can be simulated by 934 and 1748 C3D8R units respectively, with a buried depth of 0.6m and 2.8m×2.8m (horizontally). The material of the grounding grid and grounding down conductor is 5mm thick and 50mm wide galvanized steel. The small grid is 50mm wide, with a total of 25 grids. According to the above grounding grid and grounding down conductor, when the ground settles, the maximum load of the grounding down conductor is 351MPa, so the settlement force Fs =4284kg acting on the galvanized steel with a cross-section of 30mm×4mm.

[0044] According to an embodiment of the present invention, the soil in the target area refers to soil of the same soil quality as the location of the target grounding grid. When the soil in the target area is added to the soil test box, it is compacted layer by layer.

[0045] According to an embodiment of the present invention, the weight of the soil test box may be W1, where W1 corresponds to the ground settlement force Fs applied to the ground down conductor during ground settlement calculated by finite element simulation, that is, W1=Fs.

[0046] Generally, the material of the flexible connection structure of the grounding down conductor will also have a certain impact on the simulated settlement process. Therefore, the weight of the soil test box can also be W2. The force Fy required to reach the yield strength is calculated based on the material, yield strength, cross-sectional area, etc. of the flexible connection structure of the grounding down conductor. The total weight W2 of the soil corrosion test box can be calculated according to Fy, W2=1.5Fy.

[0047] For example, the yield strength of Q235 galvanized steel is 235MPa. For galvanized steel with a cross-section of 30mm×4mm, its Fy =2.868t, then W2=1.5Fy =4.302t.

[0048] According to an embodiment of the present invention, the test requirements may include testing the flexibility and corrosion resistance of the grounding down conductor. The flexibility may include a flexibility index and a flexibility degree, and the corrosion resistance may include a corrosion rate and a corrosion morphology.

[0049] According to an embodiment of the present invention, the average ground settlement velocity of the target area may be an annual average ground settlement velocity or a monthly average ground settlement velocity. The predetermined service life of the ground down conductor to be tested may be the design life of the ground down conductor, for example, the design life may be 5 years or 10 years.

[0050] Figure 3 A cross-sectional view of a performance testing device for a ground down conductor according to an embodiment of the present invention is shown.

[0051] According to an embodiment of the present invention, Figure 3 As shown, the first end 341 of the grounding down conductor to be tested is fixed on the first dynamometer 347 on the connecting beam 343, and the second end 342 of the grounding down conductor to be tested passes through the internal soil of the soil test box 344 and is connected to the bottom. The first connector part 345 of the grounding down conductor to be tested can be connected by "welding (for example: lap welding) + bolts", the first end 341 of the grounding down conductor to be tested can be connected to the first end fixing part by bolts, and similarly, the second connector part 346 of the grounding down conductor to be tested can be welded, and the second end 342 of the grounding down conductor to be tested can be connected to the second end fixing part by bolts, and the fixing part is connected to the fixing seat at the bottom of the soil test box 344 by welding.

[0052] According to an embodiment of the present invention, the soil test box can be dynamically lowered by a uniform lifting device capable of controlling the lifting speed to simulate the ground settlement state of the target area.

[0053] According to an embodiment of the present invention, processing multiple groups of tension data of the first end and elongation length data of the grounding down conductor to be tested may include drawing a data graph based on the tension data of the first end and the elongation length data of the grounding down conductor to be tested or other data analysis methods to determine the correlation between the tension data of the first end and the elongation length data of the grounding down conductor to be tested.

[0054] According to an embodiment of the present invention, by simulating and calculating the parameters of the target grounding grid and the soil in the target area, the ground settlement force applied to the grounding down conductor to be tested of the target grounding grid is obtained, and then the weight of the soil test box is determined. Based on the actual performance test requirements, according to the parameters required for the test of the target area, the dynamic landing strategy of the soil test box during the test is obtained. According to the dynamic landing strategy, the ground settlement state of the target area is simulated, and the force change of the grounding down conductor in the face of ground settlement is tested under this simulation condition to obtain tension data and elongation length data, and the performance test results of the grounding down conductor are obtained by processing the above data. Therefore, the performance test method and device of the grounding down conductor provided by the present invention can effectively simulate soil conditions, perform performance tests on the flexible connection structure of the grounding down conductor, fill the gap in the performance test method of the grounding down conductor, and realize the construction of the performance test method and device of the grounding down conductor. The method can effectively deal with the corrosion behavior of the grounding down conductor, save time and economic costs for the prevention of power grid disasters, and provide a scientific basis for power grid system planning.

[0055] According to an embodiment of the present invention, based on the test requirements, according to the average ground settlement rate of the target area, the scheduled usage time of the grounding lead to be tested and the scheduled landing interval time, a dynamic landing strategy of the soil test box during the test process is obtained, including: obtaining the target landing height according to the average ground settlement rate and the scheduled usage time; and determining the dynamic landing strategy according to the target landing height and the scheduled landing interval time based on the test requirements.

[0056] According to an embodiment of the present invention, the target landing height may be represented by ΔH, which represents the simulated ground settlement amount and can be calculated by the following formula:

[0057] (1)

[0058] Wherein, Vs is the average annual ground settlement velocity at the actual grounding grid location, and T is the design life of the grounding down conductor.

[0059] According to an embodiment of the present invention, the starting height and the final height of the soil test box are determined according to the target drop height and the deformation requirement of the flexible connection structure:

[0060] (2)

[0061] Among them, H0 is the starting height of the soil test box, and Hs is the final height of the soil test box.

[0062] According to an embodiment of the present invention, the target drop height is calculated based on the average annual ground settlement rate of the actual grounding grid location and the design life of the actual grounding down conductor used, as a simulation parameter of the ground settlement amount. The target drop height is a basic parameter in the test, and the determination of this value is very important. The actual target area situation is used as the calculation source of the target drop height, which improves the rationality and effectiveness of the dynamic drop strategy, and also improves the scientific nature of the performance test method.

[0063] According to an embodiment of the present invention, based on the test requirements, a dynamic landing strategy is determined according to the target landing altitude and the predetermined landing interval duration, including: based on the test requirements, determining a first test duration; obtaining a first landing speed according to the target landing altitude and the first test duration; obtaining a first number of landings according to the first test duration and the predetermined landing interval duration; and obtaining a first dynamic landing strategy according to the target landing altitude, the first landing speed, the first number of landings and the predetermined landing interval duration.

[0064] According to an embodiment of the present invention, when it is necessary to test the corrosion performance, the first test duration Ts1 is generally not less than 12 months, and Ts1 may also be 6 months.

[0065] According to an embodiment of the present invention, a first landing speed is obtained according to the target landing height and the first test duration, and the calculation formula is as follows:

[0066] (3)

[0067] Wherein, ΔH is the target landing height, Ts is the first test duration, and Vt is the first landing speed.

[0068] According to an embodiment of the present invention, the first number of landings is obtained according to the first test duration and the predetermined landing interval duration, and the calculation formula is as follows:

[0069] (4)

[0070] Wherein, Ts is the duration of the first test, Δt is the duration of the predetermined landing interval, and N is the first number of landings.

[0071] According to an embodiment of the present invention, based on the test requirements, the test duration is first determined, and then a dynamic landing strategy including the landing speed and the number of landings is obtained from the test duration. In the test with corrosion resistance performance test, since the corrosion process takes a long time, in order to ensure the scientificity and rationality of the simulation results of the performance test of the grounding down conductor to be tested, a half-year or one-year period is first determined as the test duration to realize the corrosion resistance performance test of the grounding down conductor to be tested and avoid the appearance of invalid test results.

[0072] According to an embodiment of the present invention, the above-mentioned grounding down conductor performance test method further includes: after a first test time, performing a corrosion test on the grounding down conductor to be tested to obtain corrosion status data.

[0073] According to an embodiment of the present invention, the corrosion rate of the sample is measured by the total thickness method.

[0074] When the specimen is galvanized, its thickness is measured using a galvanized layer thickness gauge.

[0075] Use a micrometer to measure the thickness Am0 of each part of the sample before the corrosion test and the thickness Am1 of the sample after the corrosion test; use a galvanized layer thickness gauge to measure the thickness Ag0 of the galvanized layer of each part before the corrosion test and the thickness Ag1 of the galvanized layer of the sample after the corrosion test; use an oil-based marker to mark the measurement position on the side of the sample to facilitate the measurement of the thickness change at the same position after the test. Among them, the measurement accuracy of the thickness micrometer is not less than 1μm, and the measurement accuracy of the galvanized layer thickness gauge is not less than 0.1μm. In particular, before the test, the grounding down conductor sample to be tested needs to be placed in a constant temperature environment for 4 hours before the thickness measurement. Similarly, after the corrosion performance test is completed, the grounding down conductor to be tested still needs to be placed in the above-mentioned constant temperature environment for thickness measurement. The constant temperature environment includes a room at 25±3℃.

[0076] The corrosion rate calculation formula of the sample is as follows:

[0077] (5)

[0078] (6)

[0079] Among them, V corr Indicates the corrosion rate, Am0 indicates the thickness of each part of the sample measured by a micrometer before the corrosion test, Am1 indicates the thickness of each part of the sample measured by a micrometer after the corrosion test, Ag0 indicates the thickness of the galvanized layer measured by a galvanized layer thickness gauge before the corrosion test, Ag1 indicates the thickness of the galvanized layer measured by a galvanized layer thickness gauge after the corrosion test, and Ts is the test duration. Among them, the units of Am0, Am1, Ag0, and Ag1 are mm, the unit of Ts is hours, and V corr The unit is mm / a.

[0080] According to an embodiment of the present invention, the corrosion rate V of the grounding down conductor is corr Eligibility criteria include:

[0081] 1-year galvanized steel corrosion rate V corr Qualification criteria: When V corr ≤0.065mm / a, the corrosion rate index is qualified. corr >0.065mm / a, the corrosion rate index is unqualified.

[0082] Corrosion rate of galvanized steel in half a year V corr Qualification criteria: When V corr ≤0.1mm / a, the corrosion rate index is qualified. corr >0.1mm / a, the corrosion rate index is unqualified.

[0083] For example, in a test lasting 16 weeks (3.69 months), the corrosion rate V of the sample is calculated according to the measured data using formula (5) or formula (6): corr The measurement results are shown in Table 1. From the results shown in Table 1, it can be seen that the corrosion rate of the most seriously corroded part is 0.08727 mm / a, which is less than 0.1 mm / a, and the corrosion rate index of the flexible connection structure is qualified.

[0084] Table 1 Corrosion rate measurement results:

[0085]

[0086] According to an embodiment of the present invention, after the corrosion performance test is completed, the corrosion products on the surface of the sample are cleaned according to "GB / T 16545-2015 Corrosion of Metals and Alloys - Removal of Corrosion Products on Corrosion Test Specimens". After cleaning the sample, the corrosion morphology on the surface of the sample is observed.

[0087] According to an embodiment of the present invention, after a one-year test, the unqualified criterion for the corrosion morphology of the sample includes:

[0088] After the one-year test, the specimens are deemed unqualified if their corrosion morphology (observed with the naked eye or under a 10x magnifying glass) shows any of the following: broken joints or cracks with a depth exceeding 0.1mm; pitting corrosion occurs on the specimen, with the maximum hole depth exceeding 0.1mm; cracks appear on the surface of the specimen, with the maximum hole depth exceeding 0.1mm.

[0089] Figure 4 A schematic diagram of the morphology of the flexible connection structure of the grounding down conductor to be tested before and after the performance test according to an embodiment of the present invention is shown.

[0090] like Figure 4As shown, the grounding down conductor 411 to be tested is in a more obvious bending state before the test. After the performance test of the grounding down conductor to be tested, the grounding down conductor to be tested is taken out, and it can be observed with the naked eye that the grounding down conductor 412 to be tested is stretched to a certain length after the test, and the sample is intact without any breakage at the connection.

[0091] Figure 5a , Figure 5b , Figure 5c and Figure 5d Optical microscope photos showing the surface of different locations of the sample before and after cleaning.

[0092] like Figure 5a-5d As shown, after the corrosion products of the sample were cleaned according to the above method, it was observed under an optical microscope that there were no cracks or pitting on the surface of the sample, and the corrosion morphology indicators of the sample were qualified.

[0093] According to an embodiment of the present invention, based on the test requirements of corrosion performance, after determining the first test duration, a corrosion test is performed on the ground down conductor to be tested to obtain corrosion status data. During the process of ground subsidence, the ground down conductor will not only be stretched by the tensile force, but will also be affected by the stress corrosion of the underground soil, resulting in stress corrosion fracture of the ground down conductor, and then leading to the occurrence of power transmission and transformation accidents. Therefore, the corrosion performance test of the ground down conductor is crucial. Conducting corrosion performance tests on the ground down conductor to understand its corrosion conditions under different soil conditions can effectively deal with the corrosion behavior of the ground down conductor.

[0094] According to an embodiment of the present invention, based on the test requirements, a dynamic landing strategy is determined according to the target landing height and the predetermined landing interval duration, including: determining each landing height based on the test requirements; obtaining a second test duration according to the target landing height, each landing height and the predetermined landing interval duration; obtaining a second landing speed according to the second test duration and the target landing height; and obtaining a second dynamic landing strategy according to the second landing speed, each landing height, the target landing height and the predetermined landing interval duration.

[0095] According to an embodiment of the present invention, when there is no need to perform a corrosion performance test, the height of each drop and the predetermined drop interval duration are determined.

[0096] The height of each descent of the soil test box is defined as Δh, that is, the height of each descent is Δh. Take Δh≤40mm, and 0.01ΔH≤Δh≤0.1ΔH. Define the time interval between two consecutive descents of the soil test box as Δt, that is, the predetermined descent interval is Δt, and take Δt≧120 h.

[0097] According to an embodiment of the present invention, the second test duration Ts2 is obtained according to the target landing height, each landing height and the predetermined landing interval. The calculation formula of the second test duration is as follows:

[0098] (7)

[0099] Wherein, ΔH represents the target landing height, Δh represents the landing height at each time, Δt represents the predetermined landing interval duration, and Ts represents the second test duration.

[0100] According to an embodiment of the present invention, the second landing speed is obtained according to the second test duration and the target landing height. The calculation formula is the same as formula (3), which will not be repeated here.

[0101] For example, the second dynamic strategy is as follows: Determine the ground settlement ΔH based on the annual average ground settlement rate Vs at the actual grounding grid location and the design life T of the grounding down conductor. Take the annual average ground settlement rate Vs = 19-20mm / a, the design life T of the grounding down conductor is 20 years, then the ground settlement ΔH is about 380-400mm. According to the ground settlement of 380-400mm and the deformation requirement of at least 80% of the flexible connection structure, the starting height H0 of the soil test box can be set to 780-800mm and the final height Hs can be set to 280-300mm. Δt is not less than 120 hours, take Δt = 168 hours (1 week), each drop height is about 23-25mm, thus determining the second test duration Ts2, and the test cycle is 16 weeks. According to the second test duration Ts2 and the predetermined drop interval duration Δt, determine the number of drops N and the second drop speed Vt of the soil test box, then drop once a week, the number of drops is 16 times.

[0102] According to an embodiment of the present invention, when there is no need to perform a corrosion performance test, the height of each drop is defined according to the requirements of test rationality and scientificity, and a parameter range that meets the conditions is selected to determine the height of each drop of the soil test box. The second test duration is obtained by the target drop height, each drop height and the predetermined drop interval, and then the second drop speed is determined according to the second test duration and the target drop height. Finally, a second dynamic drop strategy including the second drop speed, each drop height, the target drop height and the predetermined drop interval is obtained. In the second dynamic drop strategy, since there is no need to perform a corrosion performance test, the test duration can be reduced according to the actual situation, and it is not necessary to still require the test duration to be half a year or a year, which will greatly reduce the test time and the manpower and material resources consumed in the test, and relatively quickly obtain the performance test results of the grounding down conductor to be tested. According to different test requirements, the parameters of the dynamic drop strategy are reasonably adjusted to improve the flexibility and scientificity of the grounding down conductor performance test method.

[0103] According to an embodiment of the present invention, a performance test result of a grounding down conductor is obtained by processing multiple groups of tension data of the first end and elongation length data of the grounding down conductor to be tested; a stretching curve diagram of the grounding down conductor to be tested is plotted based on multiple groups of tension data of the first end and elongation length data of the grounding down conductor to be tested; a target elongation length is calculated according to the structural parameters of the grounding down conductor to be tested; a target tension corresponding to the target elongation length is queried from the stretching curve diagram; and a flexibility index of the grounding down conductor to be tested is obtained according to the target tension and the ground settlement force.

[0104] According to an embodiment of the present invention, the falling height Δh of the soil test box is determined each time, the soil box is lowered, and a predetermined falling interval time Δt is stabilized.

[0105] According to the cumulative drop height, decide whether to end the ground settlement simulation test. When the cumulative drop height of the soil test box is less than ΔH, the soil test box appears to be suspended, and it is still suspended within a settlement interval time Δt, the test is terminated and the total elongation length ΔL of the flexible connection structure is measured. When the cumulative drop height of the soil test box is equal to ΔH, the soil test box is still not suspended, and the test is terminated. At this time, the total elongation length of the flexible connection structure ΔL=ΔH.

[0106] According to an embodiment of the present invention, the height of each descent of the soil test box is determined, the soil box is lowered according to the parameter, and after a stable settlement interval time Δt, the dynamometer reading is recorded. The dynamometer reading read after the i-th settlement is recorded as F(i), i=1,...,N; and the elongation of the sample L(i) is recorded at the same time. After the test is completed, a tensile curve diagram of the grounding down conductor to be tested is obtained by drawing with F(i) as the vertical axis and L(i) as the horizontal axis.

[0107] Figure 6 A stretching curve diagram of a ground down conductor flexible connection structure according to an embodiment of the present invention is shown.

[0108] by Figure 6 Taking the tensile curve of the flexible connection structure of the grounding down conductor as an example, Figure 6 As shown, when the elongation length is 0-150mm, the corresponding tension increases slowly, and when the elongation length is greater than 150mm, the corresponding tension shows a sharp increase. This image result means that the elongation length of 150mm is the maximum elongation of the flexible part of the flexible connection structure.

[0109] Figure 7 A schematic diagram of a flexible connection structure of a ground down conductor according to an embodiment of the present invention is shown.

[0110] According to an embodiment of the present invention, the target elongation length is calculated based on the structural parameters of the grounding down conductor 700 to be tested. The target elongation length is the difference between the elongation lengths before and after the flexible connection structure is fully extended, that is, the maximum theoretical elongation.

[0111] like Figure 7 As shown, the initial length of the flexible connection structure is 4R, and the length after full extension is 2πR, so the target extension length = 2(π-2)R.

[0112] According to an embodiment of the present invention, the corresponding F when L(i)=target elongation length is obtained from the graph. 0.8 The flexibility index FI of the flexible connection structure is calculated according to the following formula:

[0113] (8)

[0114] Among them, F 0.8 It represents the tension required when the flexible part of the grounding down conductor stretches 80% (unit: N). Fs is the ground settlement force applied to the grounding down conductor due to ground settlement (unit: N).

[0115] According to an embodiment of the present invention, the flexible performance qualification criteria of the grounding down conductor flexible connection structure include:

[0116] Flexibility index FI qualification criteria: when FI<1, the flexibility is qualified; when FI≥1, the flexibility is unqualified.

[0117] Taking the flexibility index FI as an example, the above judgment and calculation process is described. Figure 6 The tensile curve of the flexible connection structure with R=60mm is shown in Figure 1. The initial length of the flexible connection structure is 4R=240mm, the length after full extension is 2πR=376.8mm, and the target elongation length is 2(π-2)R=136.8mm. Figure 6 The corresponding F 0.8 value, therefore, according to Figure 6 Get F 0.8 =161.4kg, according to the finite element simulation calculation, Fs=4284kg. Calculated by formula (8), we get: FI=0.04.

[0118] Therefore, when the ground sinks, the force exerted on the grounding down conductor due to ground sinking is much greater than the pulling force required for the flexible connection structure to stretch. The flexible connection structure will stretch with the ground sinking, FI<1, and the flexibility index of the flexible connection structure is qualified.

[0119] According to an embodiment of the present invention, by processing multiple groups of tension data of the first end and the elongation length data of the grounding down conductor to be tested, the performance test results of the grounding down conductor are obtained. Measuring multiple groups of data meets the basic requirements of the performance test test, so the performance test method of the grounding down conductor meets the requirements of test reliability and can obtain test data and results that meet the universal law. A stretching curve diagram of the grounding down conductor to be tested is drawn from the tension data and the elongation length data. Through the obtained stretching curve diagram, the target tension corresponding to the target elongation length can be quickly and accurately determined, and the change process and change trend of the tension and elongation length of the grounding down conductor to be tested during the test can be intuitively obtained. According to the target tension and ground settlement force, the flexibility index of the grounding down conductor to be tested is calculated. The flexibility index is defined based on the tension received by the grounding down conductor as the starting point, and has the basis for judging the flexibility performance. Through the obtained flexibility index, the flexibility performance of the grounding down conductor to be tested can be quickly judged.

[0120] According to an embodiment of the present invention, the performance testing method further comprises: obtaining the flexibility of the grounding down conductor to be tested according to the elongation length of the grounding down conductor to be tested under the action of ground settlement force and the target elongation length.

[0121] The calculation formula of the flexibility FL of the flexible connection structure of the grounding down conductor is as follows:

[0122] (9)

[0123] Among them, ΔL is the elongation of the flexible connection structure under the action of sedimentation force in the test, that is, the elongation length (unit: m), and TL is the maximum elongation of the flexible part of the flexible connection structure, that is, the target elongation length (unit: m).

[0124] According to an embodiment of the present invention, the flexible performance qualification criteria of the grounding down conductor flexible connection structure include:

[0125] Flexibility FL qualified criterion: when FL≥0.8, the flexibility is qualified; when FL<0.8, the flexibility is unqualified.

[0126] According to an embodiment of the present invention, the flexibility of the ground down conductor to be tested is calculated by using two parameters, namely, the elongation length of the ground down conductor to be tested under the action of ground settlement force and the target elongation length. The flexibility is defined based on the elongation of the ground down conductor after being subjected to tension, and has a basis for judging the flexibility performance. The obtained flexibility can be used to quickly judge the flexibility performance of the ground down conductor to be tested.

[0127] According to an embodiment of the present invention, based on the above-mentioned performance testing method of the grounding down conductor, the present invention also provides a performance testing device for the grounding down conductor used in the above-mentioned method, comprising: a crossbeam, the crossbeam being connected to the first end of the grounding down conductor to be tested through a first fixing member; a soil test box, the bottom inner wall of the soil test box being connected to the second end of the grounding down conductor to be tested through a second fixing member; a traction mechanism, one end of the traction mechanism being connected to the crossbeam, and the other end of the traction mechanism being connected to the side wall of the soil test box, for controlling the descent of the soil test box; a dynamometer being arranged on the first fixing member, for measuring the tension at the first end during the descent of the soil test box.

[0128] Figure 8 A schematic diagram of a performance testing device for a ground down conductor according to an embodiment of the present invention is shown.

[0129] like Figure 8 As shown, the performance testing device 800 includes a crossbeam 801 , a soil test box 816 , a traction mechanism 807 , a second dynamometer 815 , a first fixing member 817 , and a second fixing member 818 .

[0130] According to an embodiment of the present invention, the fixing member 806 includes a first fixing member 817 and a second fixing member 818. The first fixing member 817 and the second fixing member 818 may be bolts, studs, screws, nuts, etc. The first fixing member 817 is welded to the crossbeam 801, and the second fixing member 818 is welded to the bottom of the soil test box 816.

[0131] According to an embodiment of the present invention, the second dynamometer 815 has a measuring range of 5t-8t and an accuracy of 1kg, and is connected to the first fixing member 817 by bolts for testing the tension value.

[0132] According to an embodiment of the present invention, the grounding down conductor flexible connection structure 814 includes an upper end connection piece 820 and a lower end connection piece 819. The grounding down conductor flexible connection structure 814 can be made of a circular material or a square material, and the upper end connection piece 820 and the lower end connection piece 819 can be made of a square material. When the grounding down conductor flexible connection structure 814 uses a circular material, a square material can be welded at both ends of the structure, holes can be punched in the square material, the upper part is fixed to the second dynamometer 815, and the lower part is fixed to the second fixing piece 818.

[0133] According to an embodiment of the present invention, the beam 801 is connected to the second dynamometer 815 via the first fixing member 817, the first end of the grounding down conductor flexible connection structure 814 is connected to the second dynamometer 815, and the second end of the grounding down conductor flexible connection structure 814 is connected to the second fixing member 818 on the bottom inner wall of the soil test box 816.

[0134] Fig. 9A schematic diagram of a soil test box bracket and a lower fixing member in a performance testing device for a grounding down conductor according to an embodiment of the present invention is shown.

[0135] According to the embodiment of the present invention, the fixing position of the flexible connection structure of the grounding down conductor is determined according to the settlement amount and the flexible connection structure of the grounding down conductor. When the first fixing member 817 is welded to the crossbeam 801, and when the second fixing member 818 is welded to the bottom horizontal bracket of the soil test box 816, a suitable welding position can be selected according to the flexible connection structure. In particular, if Fig. 9 As shown, the side 902 of the second fixing member 818 needs to ensure that it is in a vertical line with the side of the fixing hole below the dynamometer. The second fixing member 818 is fixed on the horizontal bracket 901 at the bottom of the soil test box 816, and a double hole is opened on the side to fix the flexible connection structure of the grounding lead.

[0136] According to an embodiment of the present invention, the traction mechanism 807 includes hand chain hoists of different ranges. Figure 8 As shown, the traction mechanism 807 is two HSZ-T type hand chain hoists with a range of 5t-8t. The traction mechanism 807 achieves the purpose of raising and lowering by controlling the chain, and is used to control the descent of the soil test box 816. The traction mechanism 807 is connected to the beam at one end and the side wall of the soil test box 816 at the other end through a connecting device.

[0137] According to an embodiment of the present invention, in the performance test device for the grounding down conductor used in the above method, the two ends of the grounding down conductor to be tested are fixedly connected to the crossbeam and the bottom inner wall of the soil test box respectively, which can effectively simulate the ground soil environment of the grounding down conductor and realize the performance test of the grounding down conductor. A traction mechanism is provided in the device to control the descent of the soil test box, which can effectively simulate the ground subsidence environment and realize the performance test of the grounding down conductor. A dynamometer is provided on the first fixing member, which can accurately measure the tension exerted on the first end of the grounding down conductor to be tested during the descent of the soil test box. The arrangement of the above test device components realizes the real simulation of the ground subsidence process and the effective analysis of the performance of the grounding down conductor.

[0138] According to an embodiment of the present invention, in a performance testing device for a grounding down conductor, a first lifting lug is provided on the crossbeam; a second lifting lug is provided on the side wall of the soil test box; one end of the traction mechanism is connected to the first lifting lug; and the other end of the traction mechanism is connected to the second lifting lug.

[0139] like Figure 8 As shown, one end of the traction mechanism 807 is connected to the cross beam 801 through an upper lifting lug 809, and the upper lifting lug 809 is connected to the cross beam 801 by welding. The other end of the traction mechanism 807 is connected to the side wall of the soil test box 816 through a side lifting lug 808, and the side lifting lug 808 is also connected to the side wall of the soil test box 816 by welding.

[0140] For example, when the traction mechanism 807 is a hand chain hoist, the upper lifting ear 809 is the position where the upper hook of the hand chain hoist is located, and the side lifting ear 808 is the position where the lower hook of the hand chain hoist is located.

[0141] According to an embodiment of the present invention, by providing an upper lifting ear on the crossbeam and a side lifting ear on the side wall of the soil test box, a flexible connection between the crossbeam, the traction mechanism and the soil test box is achieved. The provision of the lifting ear makes it easy to connect and release the above components and facilitates the use of the traction mechanism.

[0142] According to an embodiment of the present invention, the device also includes: a bracket, which is arranged at both ends of the beam and is used to support the beam; a base, which is fixedly connected to the bracket; and a plurality of gaskets, which are movably arranged between the soil test box and the base; wherein the thickness of each gasket is less than or equal to the falling height of the soil test box each time.

[0143] According to an embodiment of the present invention, the support includes a load-bearing triangular support and a load-bearing vertical support. Figure 8 As shown, the performance testing device 800 also includes a load-bearing triangular bracket 803, a load-bearing vertical bracket 804, a load-bearing base 805 and a gasket 810. The load-bearing triangular bracket 803 is welded to the load-bearing vertical bracket 804, and the load-bearing base 805 is fixedly connected to the load-bearing triangular bracket 803 and the load-bearing vertical bracket 804, and is synchronized with the crossbeam 801.

[0144] According to an embodiment of the present invention, the gasket 810 can be freely and easily extracted and inserted between the soil test box and the base to adjust the descending height of the soil test box. The thickness of the gasket 810 can be a steel plate of 2mm, 3mm, or 5mm.

[0145] According to an embodiment of the present invention, in the performance test device of the grounding down conductor, a bracket and a base are provided to ensure the stability of the entire device. A plurality of gaskets are movably provided between the soil test box and the base, so that the descending height of the soil test box can be adjusted quickly and conveniently, and at the same time, a certain supporting effect is played on the soil test box.

[0146] According to an embodiment of the present invention, the performance testing device 800 further includes a galvanized bolt 802, an inner wall 811 of a soil test box, upper and lower connecting welding pieces 812, and a scale 813. The galvanized bolt 802 is responsible for fixing and connecting the upper and lower connecting welding pieces 812, and the upper and lower connecting welding pieces 812 include an upper connecting piece and a lower connecting piece, the upper connecting piece is welded on the crossbeam 801, and the lower connecting piece is welded on the load-bearing vertical bracket 804. The scale 813 is arranged on the crossbeam 801, and is used to measure the height position of the soil test box. The scale 813 includes a circular scale, which can accurately observe the descending height.

[0147] According to an embodiment of the present invention, the geometric dimensions of the soil test box and the dimensions of other components of the test device are determined according to the geometric dimensions of the grounding down conductor flexible connection structure, the weight of the soil test box, and the soil type.

[0148] For example, the flexible connection structure to be tested is made of 30mm wide and 4mm thick galvanized steel, the length of its flexible part is L0=4R (R=60mm), the weight of the soil test box is selected to be 4.4t, and the backfill soil density is 1800kg / m 3 The dimensions of the soil test box are 1.4-1.6m long, 1.4-1.6m wide, and 1.4-1.6m high. Referring to the above parameters, determine the geometric dimensions of the soil test box and the dimensions of other components of the test device. The specific parameters are shown below.

[0149] The crossbeam 801 can be an I-beam with a length of 300-500cm. The load-bearing vertical bracket 804 can be 300-500cm in height. The load-bearing base 805 can be 300-500cm wide and 300-500cm long, and is synchronized with the load-bearing crossbeam 801. The specifications of the inner wall 811 plate of the soil test box can be a PVC plate with a thickness of 2cm-5cm, which encloses an internal space with a length of 140cm-160cm, a width of 140cm-160cm, and a height of 140-160cm. The scale 813 that can be used to accurately observe the descending height can have a range of 200cm-250cm and an accuracy of 1mm. According to the weight of the soil test box, a dynamometer with a range of 5t and a measurement accuracy of 1kg and a hand chain hoist with a range of 5t and a minimum lowering height of 1mm can be selected.

[0150] According to an embodiment of the present invention, according to the above-mentioned device, the test is started according to the test method. Place the soil test box on the ground, connect the second end of the grounding down conductor flexible connection structure to the second fixing piece of the soil test box, and fill the soil according to the filling requirements of the relevant backfill soil. Use a traction mechanism to raise the soil test box to more than 1 cm above the starting height, place a gasket under the soil test box, and lower the soil test box to the starting height. The first end of the grounding down conductor flexible connection structure is fixed to the lower fixing hole of the dynamometer. Conduct the test according to the dynamic landing strategy. After the test cycle is over, remove the grounding down conductor flexible connection structure of the lower fixing hole of the dynamometer, lower the soil test box to the ground, take out the backfill soil, and remove the grounding down conductor flexible connection structure on the second fixing piece. Clean the sample, observe the corrosion morphology on the surface of the sample, measure the thickness of the sample, and calculate the corrosion rate V of the sample. corr, judge whether the corrosion performance of the sample is qualified. Calculate the flexibility index and flexibility based on the measured tensile force data and elongation length data to judge whether the flexibility performance of the sample is qualified. Evaluate the performance of the flexible connection structure of the grounding down conductor based on the test results. For example, the flexible connection results of the grounding down conductor tested are qualified in the flexibility index index, corrosion rate index, and corrosion morphology index.

[0151] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

[0152] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment is described above, it does not mean that the measures in each embodiment cannot be used in combination advantageously. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A performance test method for grounding down conductors, Includes: It is characterized by: Based on the structural parameters of the target grounding grid, the soil structural parameters of the target area, and the pre-buried depth parameters of the target grounding grid, the ground settlement force exerted on the grounding down conductor to be tested of the target grounding grid when ground settlement occurs in the target area is obtained through simulation; adding soil in the target area to a soil test box so that the weight of the soil test box corresponds to the ground settlement force; Based on the test requirements, according to the average ground settlement velocity of the target area, the scheduled use time of the ground down conductor to be tested and the scheduled landing interval time, a dynamic landing strategy of the soil test box during the test is obtained; Fixing the first end of the grounding down conductor to be tested, passing the second end of the grounding down conductor to be tested through the internal soil of the soil test box and connecting it to the bottom; controlling the dynamic landing of the soil test box according to the dynamic landing strategy to simulate the ground settlement state of the target area; Each time the soil test box is dropped and after the predetermined drop interval has passed, measuring and obtaining the tension data of the first end and the elongation length data of the grounding down conductor to be tested; and The performance test result of the grounding down conductor is obtained by processing a plurality of groups of tension data of the first end and elongation length data of the grounding down conductor to be tested.

2. The method according to claim 1, characterized in that: The method of obtaining a dynamic landing strategy of the soil test box during the test based on the test requirements and the average ground settlement velocity of the target area, the scheduled use time of the grounding down conductor to be tested, and the scheduled landing interval time includes: Obtaining a target landing height according to the average ground settlement speed and the predetermined use time; and Based on the test requirements, the dynamic landing strategy is determined according to the target landing height and the predetermined landing interval duration.

3. The method according to claim 2, characterized in that The determining the dynamic landing strategy based on the test requirements and according to the target landing height and the predetermined landing interval duration includes: Based on the test requirements, determine the duration of the first test; Obtaining a first landing speed according to the target landing height and the first test duration; Obtaining a first landing number according to the first test duration and the predetermined landing interval duration; and A first dynamic landing strategy is obtained according to the target landing height, the first landing speed, the first number of landings and the predetermined landing interval duration.

4. The method according to claim 3, characterized in that The method further comprises: After the first test time has elapsed, a corrosion test is performed on the grounding down conductor to be tested to obtain corrosion status data.

5. The method according to claim 2, characterized in that: The determining the dynamic landing strategy based on the test requirements and according to the target landing height and the predetermined landing interval duration includes: Determine the landing height for each landing based on test requirements; Obtaining a second test duration according to the target landing height, each landing height and the predetermined landing interval duration; Obtaining a second landing speed according to the second test duration and the target landing height; and A second dynamic landing strategy is obtained according to the second landing speed, the landing height at each time, the target landing height and the predetermined landing interval duration.

6. The method according to claim 1, characterized in that The performance test result of the grounding down conductor is obtained by processing a plurality of groups of tension data of the first end and elongation length data of the grounding down conductor to be tested; Based on the plurality of groups of tension data of the first ends and the elongation length data of the grounding down conductor to be tested, a stretching curve diagram of the grounding down conductor to be tested is drawn; Calculating a target extension length according to the structural parameters of the ground down conductor to be tested; Querying the target tension corresponding to the target elongation length from the stretching curve diagram; as well as The flexibility index of the ground down conductor to be tested is obtained according to the target pulling force and the ground settlement force.

7. The method according to claim 6, characterized in that The method further comprises: The flexibility of the grounding down conductor to be tested is obtained according to the elongation length of the grounding down conductor to be tested under the action of the ground settlement force and the target elongation length.

8. A performance testing device for a ground down conductor used in the method according to any one of claims 1 to 7, characterized in that: include: A crossbeam, wherein the crossbeam is connected to a first end of a ground down conductor to be tested through a first fixing member; A soil test box, wherein the bottom inner wall of the soil test box is connected to the second end of the ground down conductor to be tested through a second fixing member; A traction mechanism, one end of which is connected to the crossbeam, and the other end of which is connected to the side wall of the soil test box, for controlling the descent of the soil test box; A dynamometer is provided on the first fixing member for measuring the tension of the first end during the descent of the soil test box.

9. The device according to claim 8, characterized in that A first lifting lug is arranged on the crossbeam; a second lifting lug is arranged on the side wall of the soil test box; one end of the traction mechanism is connected to the first lifting lug; and the other end of the traction mechanism is connected to the second lifting lug.

10. The device according to claim 9, characterized in that The device also includes: Brackets, arranged at both ends of the crossbeam, for supporting the crossbeam; A base, fixedly connected to the bracket; A plurality of gaskets are movably arranged between the soil test box and the base; wherein the thickness of each gasket is less than or equal to the falling height of the soil test box each time.

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