A simulation test method for ice coating and de-icing jumping of electric wires

Abstract

The present invention discloses a simulation test method for ice coating and de-icing jump of electric wires. A spring is used to replace the electric wire for the simulation test of ice coating and de-icing of the transmission line electric wire. The spring is an analogue of the electric wire. The spring is horizontally suspended between two hanging points. The distance between the two hanging points represents the span, and the spring length represents the wire length. After the load borne by the spring changes, according to the equation provided by the present invention, the spring length, tension and sag after the load change are obtained and compared with the simulation test results to check the coincidence degree between the simulation test device established by using the spring to replace the electric wire and the actual transmission line to be simulated. The present invention provides a relatively simple, economical and practical method for studying the laws of tension, unbalanced tension and load change under the states of ice coating, de-icing, uneven ice coating, out-of-phase de-icing, etc. of the transmission line, as well as the tension and its change and jump amplitude of the de-icing jump.

Description

Technical Field

[0001] This application relates to the technical field of transmission lines, and mainly relates to a simulation test method for wire icing and de-icing jumps. Background Art

[0002] Wire de-icing jump is a form of motion caused by the sudden release of the tension borne by metal wire and the elastic expansion and contraction of the wire. The purposes of wire icing and de-icing jump tests are usually as follows: for isolated spans or continuous spans of transmission lines, under different icing conditions and design conditions, through tests, obtain the values and variation laws of wire tension, sag, suspension insulator string offset, unbalanced tension, etc. caused by wire icing; through wire de-icing jump tests, obtain the values of wire de-icing jump amplitude, wire tension, suspension string offset, jump frequency, etc., summarize and study their variation laws, as well as their correlations with other conditions; provide basis and guidance for transmission line design, optimization, accident analysis, disaster prevention and mitigation, etc.

[0003] The research on wire de-icing jump mainly has two research methods: experiment and simulation calculation. Jamaleddine et al. in Canada carried out de-icing simulation tests of static loads on a 3.22m long wire in an artificial climate chamber in the laboratory, and simulated various de-icing situations, but the test results obtained from a relatively small-scale model cannot be popularized and applied to actual lines; Chen Yong et al. in China carried out de-icing jump simulation tests and simulation calculations. Considering an isolated span and two continuous spans respectively at a distance of 235m, distributed loads were arranged on the wire to simulate icing, and the loads were released to simulate de-icing. The above test methods all use ordinary wires to carry out icing and de-icing jump tests, which are difficult to operate and have low economy. With the rapid development of computer technology in recent decades, simulation calculation and numerical simulation have become the main research methods for the problem of wire de-icing jump. However, due to the uncertainty of calculation methods and parameter selection, there may be a large difference between the numerical simulation results and the actual situation. When carrying out wire icing and de-icing jump tests, wires are usually used. However, due to the relatively large elastic coefficient of the wire, a longer wire is required to obtain practical conclusions; at the same time, it also requires a relatively large test span to better reflect the characteristics of wire icing and de-icing jump and be popularized and applied to actual transmission lines. The longer wire puts forward higher requirements for the test site, test technology, observation and cost.

[0004] This application provides a simulation test method for wire icing and de-icing jump, which solves the problem that it is difficult to carry out tests when using wires for wire icing and de-icing jump tests. Summary of the Invention

[0005] To solve the problem that it is difficult to conduct tests when using wires for ice coating and de-icing jump tests on electric wires, the present application provides a simulation test method for ice coating and de-icing jump of electric wires. Springs are used to replace the electric wires for the simulation test of ice coating and de-icing jump of transmission line electric wires. The springs are horizontally suspended between two hanging points. The projected distance on the horizontal plane between the two hanging points represents the span, and the spring length represents the wire length.

[0006] The present invention uses springs to replace electric wires for the simulation test of ice coating and de-icing jump of electric wires. There are obvious gaps between the coils of the springs, which can be stretched and compressed. Springs with lengths not less than the span can be selected for different spans and tested with different sag degrees respectively.

[0007] Optionally, an insulated electric wire passes through the spring. A plurality of electromagnet contacts are arranged on the insulated electric wire. The number of the insulated electric wires is greater than or equal to one. When the electromagnet contacts are configured to be energized, they suck the suspended heavy objects to simulate ice coating; after power-off, the heavy objects are separated to represent de-icing. The method includes:

[0008] Obtain the spring load P0 composed of the spring, the electromagnet contacts and the insulated electric wire when the insulated electric wire is not energized.

[0009] Obtain the spring load P1 after considering the additional load of simulated ice coating after the insulated electric wire is energized.

[0010] Obtain the spring load of the remaining part after one or more of the insulated electric wires are powered off, that is, the spring load P2 after de-icing.

[0011] According to the spring load P0 composed of the spring, the electromagnet contacts and the insulated electric wire, the spring load P1 after considering the additional load of simulated ice coating, and the spring load P2 after de-icing, obtain the test results; the test results include the length, tension and sag of the spring after being suspended, the length, tension and sag of the spring after simulating ice coating, and the length, tension and sag of the spring when the spring shrinks and bounces to the highest position after simulating de-icing, and the length, tension and sag of the spring after the simulation of de-icing jump stops.

[0012] The load added to the spring is used to simulate the ice coating amount of the electric wire. The loading or de-icing of ice can apply the relatively mature method of attracting or releasing the suspended distributed load by electromagnetic force, which can simulate uniform or non-uniform ice coating, and working conditions such as simultaneous or different-time de-icing. The electric wire passing through the spring is distributed with electromagnet contacts, and the load simulating the ice coating of the electric wire is suspended, and the loading or releasing of the load is simulated by energizing or powering off. Since the spring replacing the electric wire is short in length, it can also be realized in an artificial climate chamber to carry out the simulation test of ice coating and de-icing of electric wires.

[0013] Before the test, according to the simulated span and test purpose, select the spring parameters and types for replacing the wire, such as the length, thickness, material, elastic coefficient, linear mass, pitch, etc. of the spring. The parameters selected for springs of different lengths in the same test may be different.

[0014] Optionally, the method further includes:

[0015] For the isolated span with unequal suspension points, after determining the span and height difference between the suspension points, measure and record the tension and sag in the states of simulated ice coating, de-icing jump, jump stop, etc. during the test, as well as the changes in tension and sag during the spring jump.

[0016] Optionally, the method further includes:

[0017] Add one or more devices simulating suspension insulator strings between the suspension points at both ends of the spring to suspend the spring, and simulate the ice coating and de-icing tests of continuous spans of the transmission line;

[0018] After determining the span and height difference between each suspension point, measure and record the tension, sag and deflection angles of each suspension string in each continuous span in the states of simulated ice coating, de-icing jump, jump stop, etc. during the test, and record the changes in tension, sag and deflection angles of each span with time and spring jump height.

[0019] Optionally, the method further includes:

[0020] Combined with the test objectives of actual transmission line ice coating and de-icing, verify the coincidence degree between the simulated test device established by using the spring to replace the wire and the actual transmission line wire ice coating and de-icing;

[0021] Take the state where the spring is not suspended, the tension is zero, the length is the manufacturing length of the spring, there is no insulated wire and electromagnet contact as the first state; take the spring with insulated wire and electromagnet contact, horizontally suspended between two suspension points as the second state; take the spring with the electromagnet contact suspending the simulated ice-coated heavy object, horizontally suspended as the third state; measure and calculate the loads in the three states;

[0022] According to the following equations, calculate the tension in the second state from the first state and the tension in the third state from the second state respectively:

[0023]

[0024] T B =T A +k(L B -L A )

[0025] Wherein, h is the elevation difference between the hanging points of the two springs, S is the span formed between the hanging points of the two springs, k is the elastic coefficient of the spring. When the load borne by the spring changes and the spring form changes from state A to state B, T A is the spring tension in state A, T B is the spring tension in state B, L A is the spring length in state A, L B is the spring length in state B, P B is the linear load in state B.

[0026] If the tensions in the calculated second state and third state respectively match the corresponding measured data, it indicates that the icing and de-icing simulation tests using the spring to replace the wire meet the test conditions.

[0027] Optionally, the method further includes:

[0028] For a continuous span composed of multiple suspension strings hanging in the middle, select the two spans with the largest and smallest spans. When the electromagnet contact is not hanging a heavy object, fix the connection positions of the springs and the suspension strings to form two isolated spans, calculate and test respectively, and test the simulation test device of the continuous-span transmission line using the spring to replace the wire.

[0029] The present invention discloses a simulation test method for wire icing and de-icing jumps, including: using a spring to replace the wire for the simulation test of wire icing and de-icing jumps on a transmission line; the spring is an analog of the wire, and there are obvious gaps between the coils of the spring, which can be stretched and compressed; the spring is horizontally suspended between two hanging points, the distance between the two hanging points represents the span, and the spring length represents the wire length; after the load borne by the spring changes, according to the equation provided by the present invention, the spring length after the load change is obtained, and its tension and sag are further calculated, compared with the simulation test results, summarized and deduced to obtain the laws of wire icing and de-icing. The method provided by the present invention can also perform the simulation test of wire icing and de-icing jumps for continuous-span transmission lines with equal or unequal hanging point heights. The present invention provides a simulation line that reduces a transmission line hundreds of meters or even thousands of meters long in the wild to a few meters or dozens of meters, and conducts the simulation test of wire icing or de-icing in a laboratory or a test field, providing a relatively simple, economical and practical method for studying the laws of tension, unbalanced tension and load changes under the states of wire icing, de-icing, uneven icing and out-of-phase de-icing, as well as the tension and its changes and jump amplitude during de-icing jumps of a transmission line. Description of the Drawings

[0030] To more clearly illustrate the technical solutions of this application, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic diagram of the de-icing jump simulation test using a spring to replace the wire. Specific embodiments

[0032] The embodiments will be described in detail below, and the examples are shown in the accompanying drawings. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following examples do not represent all embodiments consistent with this application. They are only examples of systems and methods consistent with some aspects of this application detailed in the claims.

[0033] The present invention uses a spring to replace the wire for the wire icing and de-icing jump simulation test. There are obvious gaps between the coils of the spring, which can be stretched and compressed. As Figure 1 shown, the spring is horizontally suspended on two hanging points. The horizontal distance S between the two hanging points represents the span, and the spring length represents the wire length. Springs with a length not less than the span can be selected for different spans, and tests can be carried out with different sag degrees respectively.

[0034] The load of hanging weights is simulated by the electromagnet contacts attached to the spring to simulate the wire icing amount. The loading or de-icing of ice can apply the relatively mature method of using electromagnetic force to attract or release the suspended distributed load, which can simulate uniform or non-uniform icing, simultaneous or different-time de-icing, and non-uniform de-icing and other working conditions. One or more electromagnet contacts are distributed on one or several insulated wires passing through the spring to suspend the load simulating the wire icing, and the loading or releasing of the load is simulated by energizing or de-energizing. If there is more than one insulated wire passing through the spring and hanging weights, one of them can be de-energized, several can be de-energized simultaneously, or all can be de-energized simultaneously to simulate the incomplete de-icing or complete de-icing test respectively. Unevenly distributed hanging weights on the spring can also be used to simulate the non-uniform icing test.

[0035] The main function of the insulated wire passing through the spring is to supply power to the electromagnet and should maintain an appropriate slack. Under normal circumstances, no additional tension should be borne in any test state. For some test methods, the electromagnet electrically connected to the spring can also be powered by the spring itself without the need for an insulated wire.

[0036] Since the spring replacing the wire is short in length, it can also be realized in an artificial climate chamber to carry out the wire icing and de-icing simulation test.

[0037] Using a spring to replace the wire for icing and de-icing jump simulation tests is also applicable to isolated spans and continuous spans with unequal suspension points.

[0038] Tension sensors should be installed at the hanging points at both ends of the spring and the hanging points of the suspension string to measure the tension at the corresponding positions.

[0039] For the simulation test of wire icing and de-icing jump using a spring to replace the wire, the following formulas and methods can be provided for reference.

[0040] Approximate relationship between elastic modulus and elastic coefficient:

[0041] The physical quantity describing the stress-strain relationship of the wire in the elastic deformation state is Young's modulus, which belongs to one of the elastic moduli. Under the simple condition of unidirectional tension, the relationship between the true normal stress σ and the true strain ε can be written as: σ = E·ε, that is, Formula One:

[0042]

[0043] In the formula, T d —— Tension of the wire, N

[0044] A—— Cross-sectional area of the wire, mm2

[0045] E—— Young's elastic modulus, N / mm2

[0046] L d —— Length of the wire, m

[0047] ΔL d —— Change in the length of the wire under the action of tension T, m

[0048] "Formula One" can be rearranged into Formula Two:

[0049]

[0050] "Formula Two" shows the relationship between the tension borne by the wire and the change in the length of the wire.

[0051] When the wire changes within the elastic limit and the change amount is not very large, the cross-sectional area and the change amount of the wire length are relatively small. To simplify the calculation, ignoring the Poisson's ratio, the equivalent elastic coefficient k of the elastic expansion and contraction of the wire d Is expressed as Formula Three:

[0052]

[0053] The approximate formula for expressing the equivalent elastic modulus Et of the spring in terms of the spring elastic coefficient k is, for example, Formula Four:

[0054]

[0055] In the formula, Lt —— Spring length, m

[0056] A t —— Cross-sectional area of the spring wire, mm2

[0057] A method for testing and calculating ice coating and de-icing jumping of electric wires by using a spring to replace the electric wire.

[0058] Under normal circumstances, when studying elastic deformation using Hooke's theorem, the spring has no mass, and there is no action of inertia and gravity; while for an electric wire, although it is an elastic material, the mass and gravity of the electric wire must be considered when calculating its tension. Therefore, in the simulation test of the present invention, a suitable formula should be derived, and the spring parameters for replacing the electric wire and the calculation method of the simulation test should be reasonably selected.

[0059] The spring is horizontally suspended between two points. Affected by the gravity of the spring itself and the gravity of the fixed contact of the electromagnet (including the wire for supplying power to it), the spring will elongate. The calculation formula for the spring length L0 is as shown in Formula Five:

[0060]

[0061] In the formula, h —— Height difference between the two suspension points of the spring, m

[0062] T0 —— Tension in the horizontal direction of the spring, N

[0063] P0 —— Line load converted from the spring and electromagnetic accessories, N / m

[0064] S —— Span of the spring (projection length on the horizontal plane), m

[0065] Since the spring length changes, the tension change should conform to Hooke's theorem. The tension T0 of the suspended spring is as shown in Formula Six:

[0066] T0 = T + k(L0 - L)

[0067] In the formula, T —— Tension of the spring in the previous state, N

[0068] L —— Length of the spring in the previous state, m

[0069] k —— Elastic coefficient of the spring, N / m

[0070] Substitute Formula Six into Formula Five and simplify to obtain Formula Seven:

[0071]

[0072] Formula Seven is derived by combining the mechanical calculation method of electric wires with the elastic deformation formula of springs, obtaining the calculation method of the spring length varying with the load. Taking Formula Seven as an equation and solving the equation can obtain the spring length L0 after suspension. Calculate the tension T0 according to Formula Six, and then calculate the spring sag f0 using the following formula, Formula Eight:

[0073]

[0074] If incomplete de-icing is simulated, then in Formulas Five to Eight, the load P0 is the load including the heavy objects still hanging on the electromagnetic contact heads in the spring, that is, P0 = P2; L0 and f0 are respectively the spring length and the spring sag under the remaining heavy object load. f0 is also the sag at the position where the spring stops jumping with only the remaining heavy objects hanging; if all the heavy object loads are lost, f0 is also the sag at the position where the spring stops at the position without the heavy object load.

[0075] After the spring is loaded with the additional load simulating icing, refer to the above method to calculate the spring length L1 and the sag f1 simulating icing.

[0076] As Figure 1 shown, once the spring loses the additional load simulating icing, the spring shortens and elastic vibration will occur. After partially or completely losing the heavy object load, the spring jumps in the vertical direction. The final stopping position, that is, the place of the spring sag f0, is also the equilibrium position of the spring vibration. In the first cycle when the jump occurs, the spring is approximately in simple harmonic vibration. The shortening amount of the spring will cross the equilibrium position of the spring vibration and continue to shorten until the position where the spring length is L2. According to the law of simple harmonic vibration of the spring, Formula Nine is obtained:

[0077] L1 - L0 = L0 - L2

[0078] In the formula, L0 - the spring length after the spring stops jumping, m

[0079] L1 - the length of the spring after hanging with the additional load simulating icing, m

[0080] L2 - the spring length when the spring jumps to the highest position, m

[0081] Calculate L2 using Formula Nine, and then refer to Formula Five to solve the equation to obtain the tension T2 when the spring jumps to the highest position; refer to Formula Eight to calculate the sag f2 of the spring at the highest position.

[0082] When the load borne by the spring changes and the spring form changes from state A to state B, apply Formula Seven to establish the connection between state A and state B, solve the equation, and obtain the spring length of state B. Compare it with the corresponding length of the experimental spring, and analyze the error and reasons. The equation is as Formula Ten:

[0083]

[0084] In the formula, h—the height difference between the hanging points of the two springs, m

[0085] S—the span formed between the hanging points of the two springs, m

[0086] k—the elastic coefficient of the spring, N / m

[0087] T A —the spring tension in state A, N

[0088] L A —the spring length in state A, m

[0089] L B —the spring length in state B, m

[0090] P B —the linear load in state B, N / m.

[0091] Due to the change in the spring length, the change in the tension generated should conform to Hooke's theorem. The relationship between the tension and the wire length in state A and state B is established as shown in Formula 11:

[0092] T B = T A + k(L B - L A )

[0093] In the formula, T A —the spring tension in state A, N

[0094] T B —the spring tension in state B, N

[0095] L A —the spring length in state A, m

[0096] L B —the spring length in state B, m.

[0097] Since under normal conditions, the change in the wire length with the tension belongs to elastic deformation, the corresponding variable relationship of the wire should also conform to Formula 10 and Formula 11. Formula 10 and Formula 11 thus establish the connection between the spring and the wire. Whether it is the spring or the wire, each variable should conform to the relationship in Formula 10 and Formula 11. This is the theoretical basis for simulating the ice accretion and de-icing tests of the transmission line wires using a horizontally suspended spring. At the same time, Formula 10 and Formula 11 are also the basis for judging whether the simulation test device established with the spring conforms to the actual situation of the ice accretion and de-icing of the transmission line wires.

[0098] Combined with the test objectives of actual transmission line icing and de-icing, verify the coincidence degree between the simulation test device established by using springs to replace wires and the actual transmission line wire icing and de-icing. Take the manufacturing length, unhung, zero tension, no insulated wire and electromagnet contact of the spring as the first state; take the state with insulated wire and electromagnet contact, horizontally hung between two hanging points as the second state; take the electromagnet contact hanging the simulated ice-covered heavy object and the horizontally hung spring as the third state. If the difference between the measured data of the tension and the theoretical calculation results increases under each verification state, it is necessary to analyze the reasons and re-modify or establish a simulation test device including spring selection, spring span, measuring and observing instruments and their installation methods until satisfaction is achieved.

[0099] For continuous spans composed of multiple suspension strings hanging in the middle, select two spans with the largest and smallest spans among them. When the electromagnet contact does not hang heavy objects, fix the connection positions of the springs and the suspension strings to form two isolated spans, and calculate and test them respectively to test the established simulation test device of the continuous-span transmission line with springs replacing wires. According to the verification results, the length and weight of the suspension strings may also be adjusted.

[0100] Through the analysis and research of the simulation test data and results, explore the mechanical characteristics and laws of transmission line icing and de-icing jumps, provide reference and basis for transmission line design, and provide guiding opinions for production operation.

[0101] Table 1 Example of parameter selection and calculation results of the simulation test with springs replacing wires:

[0102]

[0103] In some embodiments, the test scheme for simulating wire de-icing jumps with springs replacing wires is carried out according to the following main steps:

[0104] Taking the isolated-span spring without height difference and all the hung heavy objects falling off at once as an example in the present invention, see Table 1 for details.

[0105] 1. Select appropriate springs

[0106] As shown in items 1 to 7 in Table 1, the spring length and specifications should be selected according to the test site and technical conditions, and generally should not be too short.

[0107] 2. Calculate and analyze spring parameters

[0108] As shown in items 8 to 15 in Table 1, according to the selected spring, calculate the basic parameters of the spring, verify with formula ten and formula eleven, analyze and compare, and select and determine the spring consistent with the test purpose. At the same time, these parameters will also be used for the next calculation to prepare for analysis and comparison during the test process and guide the test process.

[0109] 3. Apply the calculation formulas and methods of the present invention to pre-calculate the data of the main test items, and verify them with Formula Ten and Formula Eleven to prepare for the actual test.

[0110] As shown in items 16 to 20 in Table 1, calculate the length, tension, sag, etc. of the spring after being suspended; for items 21 to 26, after suspending multiple additional loads representing ice coating along the spring or loading actual ice coating, calculate the length, tension, sag, etc. of the spring after simulating ice coating.

[0111] 4. Apply the above formulas and methods to pre-calculate the tension and sag of the spring during ice shedding jump, predict the tension and sag of the spring in the test, and guide and analyze the test results.

[0112] As shown in items 27 to 30 in Table 1, calculate the length, tension, sag, etc. of the spring when it shrinks and bounces to the highest position after the additional load representing ice coating suspended on the spring falls off; for item 31, calculate the relationship between the sags at the above three positions during the spring bouncing process, compare with the law of wire ice shedding jump, and verify the calculation results and the calculation method of the present invention.

[0113] 5. Prepare for the actual simulation test

[0114] Seek suitable spring manufacturers and electromagnet device manufacturers to jointly determine suitable product parameters. For any discrepancies with the original test scheme design, they should be analyzed and modified in a timely manner. For measurement and observation equipment, careful selection should be made, and the layout and installation work should be done in advance.

[0115] For the ice shedding jump of the wire on the actual transmission line, the following conclusion is obtained through theoretical derivation: When ignoring the change in the elastic coefficient of the wire jump and the attenuation of the jump amplitude caused by air resistance, in the most severe case of the ice shedding jump of the isolated span wire, twice the square value of the sag f0 after the ice shedding jump stops is equal to the sum of the squares of the ice coating sag f1 of the wire before ice shedding and the sag f2 of the wire when it jumps to the highest position, that is

[0116] According to the example in Table 1, apply the method of the present invention to calculate f0, f1, and f2 of the spring, and the formula The absolute error on both sides of the equal sign is 0.00508, and the relative error is 1.14%. Compared with the ice shedding jump of the wire on the actual transmission line, the calculation results are in good agreement, indicating that using the spring to replace the wire for the ice coating and ice shedding simulation test of the wire is basically consistent with the law of actual wire ice coating and ice shedding, further demonstrating that the present invention has good implementable conditions.

[0117] For the similar parts between the embodiments provided in this application, reference can be made to each other. The specific embodiments provided above are only several examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other embodiments extended based on the solution of this application without creative efforts fall within the protection scope of this application.

Claims

1. A simulation test method for ice coating and de-icing jump of electric wires, characterized in that, A simulation test for ice accretion and de-icing jump of transmission line wires is carried out by using a spring to replace the wire. The spring replaces the wire and is horizontally suspended between two suspension points. The projected distance on the horizontal plane between the two suspension points represents the span, and the spring length represents the wire length; An insulating wire passes through the spring, and a plurality of electromagnet contacts are arranged on the insulating wire. The number of the insulating wires is greater than or equal to one. When the electromagnet contacts are configured to be energized, a load simulating ice accretion is loaded; after power-off, the load simulating ice accretion is released. The method includes: Obtaining the spring load P0 composed of the spring, the electromagnet contacts and the insulating wire when not energized; Obtaining the spring load P1 after considering the additional load of simulated ice accretion after being energized; Obtaining the spring load of the remaining part after one or more wires are powered off, that is, the spring load P2 after de-icing; Obtaining the test results according to the spring load P0 composed of the spring, the electromagnet contacts and the insulating wire, the spring load P1 after considering the additional load of simulated ice accretion, and the spring load P2 after de-icing; The test results include the length, tension and sag of the spring after being suspended, the length, tension and sag of the spring after simulating ice accretion, and the length, tension and sag of the spring when the spring shrinks and bounces to the highest position after simulating de-icing, and the length, tension and sag of the spring after the simulated de-icing jump stops; The method further includes: Combined with the test objectives of actual transmission line ice accretion and de-icing, verifying the coincidence degree between the simulation test device established by using a spring to replace the wire and the actual transmission line wire ice accretion and de-icing; Taking the state where the spring is not suspended, the tension is zero, the length is the manufacturing length of the spring, there is no insulating wire and electromagnet contacts as the first state; taking the spring with insulating wire and electromagnet contacts, horizontally suspended between two suspension points as the second state; taking the spring with the electromagnet contacts suspending the heavy object simulating ice accretion, horizontally suspended as the third state; measuring and calculating the loads of the three states; According to the following equations, calculate the tension of the second state from the first state and the tension of the third state from the second state respectively: ； ； Where h is the elevation difference between the hanging points of the two springs, S is the span formed between the hanging points of the two springs, k is the elastic coefficient of the spring, the load borne by the spring changes, and the spring form changes from state A to state B. T A is the spring tension in state A, T B is the spring tension in state B, L A is the spring length in state A, L B is the spring length in state B, P B is the linear load in state B; If the calculated tensions of the second state and the third state coincide with the corresponding measured data respectively, it indicates that the ice accretion and de-icing simulation test using a spring to replace the wire meets the test conditions.

2. The simulation test method for ice coating and de-icing jump of electric wires according to claim 1, wherein The method further includes: Adding one or more devices simulating suspension insulator strings between the suspension points at both ends of the spring to suspend the spring, and simulating the ice accretion and de-icing test of continuous spans of the transmission line; After determining the span and height difference between each suspension point, measure and record the tension, sag and deflection angle data of each continuous span in the states of simulated ice accretion, de-icing jump and jump stop during the test, and record the changes of the tension, sag and deflection angle of each span with time and the spring jump height.

3. The simulation test method for wire icing and de-icing jumps according to claim 2, characterized in that, The method further includes: For continuous spans composed of multiple suspension insulator strings suspended in the middle, select two spans with the largest and smallest spans, and fix the connection positions of the spring and the suspension insulator strings in the state where the electromagnet contacts do not load the simulated ice accretion load, forming two isolated spans, and calculate and test respectively to test the established simulation test device of the continuous span transmission line with a spring replacing the wire.

4. The simulation test method for wire icing and de-icing galloping according to claim 1, wherein The method further includes: For the isolated span with unequal heights of suspension points, after determining the span and height difference between the suspension points, measure and record the tension and sag in the states of simulated ice coating, de-icing jump, and jump stop during the test, as well as the changes in tension and sag during the spring jump process.

Images