Design method, device and equipment for crop cradle based on safety of induced electric shock

Abstract

This invention discloses a design method, device, and equipment for crop support frames based on inductive electric shock safety. Using finite element simulation software, a power transmission line model is constructed, and a suspended conductor is installed below the transmission line according to the typical arrangement of crop support frames. By applying voltages of different phase sequences to the conductor, the voltage to ground and the current flowing through the conductor are obtained, and the energy released upon human contact is calculated. By changing different influencing factors, different voltage to ground and energy values ​​are obtained, and a suitable installation scheme is selected based on this to ensure both economy and safety.

Description

Technical Field

[0001] This invention belongs to the technical field of metal crop support under high-voltage transmission lines, specifically relating to the design method, device and equipment for crop support based on induced electric shock safety. Background Technology

[0002] Transmission lines need to traverse various terrains such as farmland and orchards. When the transmission lines are low and there are suspended metal conductors on the ground, induced charges can easily be generated on the metal conductors. Vineyards are a common type of orchard located beneath transmission lines. Due to the needs of growth and fruit bearing, trellises are often built using wire. However, after a period of use, the grounding of these metal trellises corrodes, causing them to become suspended. During the operation and maintenance of transmission lines, because of the high voltage levels and the short distance between the transmission lines and the ground (e.g., 15m for 750kV), operators frequently experience transient electric shocks when contacting the metal trellises, directly impacting safe production. Therefore, since it is not possible to raise the height of the transmission lines themselves, the arrangement of the trellises must be considered to reduce the risk of transient electric shocks.

[0003] Currently, there is no technology specifically designed for grape trellises under high-voltage power transmission lines, and replacing metal grape trellises with other materials presents issues related to cost and durability. Different arrangements of metal grape trellises can indeed affect the induced charge on them, causing varying degrees of electric shock sensations in people. Therefore, the proper arrangement of metal grape trellises is crucial. Summary of the Invention

[0004] This invention provides a method, apparatus, and equipment for designing crop support frames based on induced electric shock safety. Without significantly increasing costs, it effectively reduces induced charging on metal surfaces and minimizes transient electric shock injuries during work.

[0005] To achieve the above objectives, the crop support design method based on inductive electric shock safety described in this invention includes the following steps:

[0006] S1. Establish an overall model, which includes a power transmission line model and a crop support model. The power transmission line model is located above the crop support model. The power transmission line model includes two A-phase power transmission lines, two B-phase power transmission lines, and two C-phase power transmission lines. The crop support model includes multiple parallel suspended conductors and initial values ​​for the arrangement parameters of the suspended conductors, including the length of the suspended conductors, the height of the suspended conductors from the ground, and the angle between the suspended conductors and the power transmission lines.

[0007] S2. Establish an air domain outside the overall model. For the established air domain, set the two sides where the transmission line penetrates vertically as electrically insulated and the other four sides as grounded. Then, apply voltages in phase A, phase B and phase C conductors according to different phase sequences to simulate the operation of the transmission line.

[0008] S3. Create swept meshes on the sides of the suspended conductor and transmission line, and create free tetrahedral meshes on the end faces of the suspended conductor and transmission line; also create free tetrahedral meshes on the other parts of the overall model.

[0009] S4. Using the swept and free tetrahedral meshes established in S3, calculate the induced voltage values ​​at both ends of each suspended conductor; change the height, length, and angle between the suspended conductor and the transmission line in sequence, while keeping the other two parameters unchanged, re-establish the swept and free tetrahedral meshes, and recalculate the induced voltage values ​​at both ends of each suspended conductor under the new arrangement parameters.

[0010] S5. Compare the induced voltage values ​​at both ends of the suspended conductor under different arrangement parameters obtained in S4. Take the induced voltage value of the suspended conductor with the smallest induced voltage value under the same arrangement parameters for comparison. Select the optimal arrangement parameters based on the comparison results.

[0011] Furthermore, in S1, an overall model is established in the COMSOL multiphysics simulation software.

[0012] Furthermore, in S4, the frequency domain calculation module in the COMSOL multiphysics simulation software is used to calculate the induced voltage values ​​at both ends of each suspended conductor.

[0013] Furthermore, in S4, the height of the suspended conductor varies from 1.5m to 4m, the length of the suspended conductor varies from 10m to 50m, and the angle between the suspended conductor and the transmission line varies from 0° to 90°.

[0014] Furthermore, in S4, the height of the suspended conductor changes in increments of 0.5m; the length of the suspended conductor changes in increments of 10m; and the angle between the suspended conductor and the transmission line changes in increments of 15°.

[0015] Furthermore, in S5, the induced voltage values ​​at both ends of the suspended conductor under different arrangement parameters obtained in S4 are compared, and the induced voltage value of the suspended conductor with the smallest induced voltage value under the same arrangement parameters is compared: the height with the smallest induced voltage value when the length of the suspended conductor and the angle between the suspended conductor and the transmission line remain unchanged is taken as the selected height; the length with the smallest induced voltage value when the height of the suspended conductor and the angle between the suspended conductor and the transmission line remain unchanged is taken as the selected length; the angle between the suspended conductor with the smallest induced voltage value and the transmission line when the height and length of the suspended conductor remain unchanged is taken as the selected angle.

[0016] Furthermore, after S5 is completed, the current flowing through the human body when the human body touches the suspended conductor under the selected arrangement parameters is calculated. Based on the current flowing through the human body, the induced energy value of the suspended conductor flowing into the ground at the moment of grounding is calculated to verify the arrangement parameters selected in S6.

[0017] Furthermore, the formula for calculating the induced energy value is ∫i 2 Rdt, where i is the current flowing through the human body, and R is the resistance value that represents the human body as a resistor.

[0018] A crop support device includes:

[0019] The input module is used to receive the initial layout parameters of the crop racks and transmit the initial layout parameters of the crop racks to the processing module.

[0020] The processing module is used to obtain multiple sets of arrangement parameters based on the initial arrangement parameters and the variation law of the set arrangement parameters, calculate the induced voltage values ​​at both ends of the crop bracket under each arrangement parameter, and then select the final arrangement parameters of the crop bracket based on the induced voltage at both ends of the crop bracket.

[0021] The display module is used to display the selected crop rack arrangement parameters.

[0022] A computer device includes an electrically connected memory and a processor, wherein the memory stores a computer program executable on the processor, and when the processor executes the computer program, it implements the steps of the above-described crop support design method.

[0023] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0024] This invention uses finite element simulation software to build a transmission line model and sets up a suspended conductor under the transmission line according to the general arrangement of crop brackets. By applying voltages of different phase sequences to the transmission line, the voltage at both ends of the suspended conductor is calculated. By changing different crop bracket arrangement parameters, different induced voltages at both ends of the suspended conductor are obtained. Based on this, appropriate crop bracket arrangement parameters are selected to ensure both economy and safety.

[0025] The method described in this invention reduces the probability and harm of transient electric shocks and increases safety by altering the induced charge on metal crop racks through changes in their arrangement, without increasing the additional cost of transmission lines. Simultaneously, the change in arrangement does not significantly affect the amount of wire used or the planting density of fruit trees or vegetables, thus avoiding economic issues. This method can also be extended to the design of other agricultural facilities under high-voltage transmission lines to enhance safety. It provides guidance for the layout of agricultural facilities under transmission lines during subsequent construction.

[0026] Furthermore, in S5, a specific implementation plan is proposed that arranges the wires perpendicular to the transmission line to minimize the induced voltage value.

[0027] Furthermore, by converting the human body model and the power transmission line model into a circuit model, the current flowing through the human body can be calculated conveniently and quickly, and the energy released at the moment of human contact can be calculated. The correctness of the selected arrangement method can be verified based on the energy released at the moment of human contact. Attached Figure Description

[0028] Figure 1 A flowchart of the method provided by the present invention;

[0029] Figure 2 This invention provides a model of a grape trellis with wires parallel to a power transmission line, built using COMSOL simulation software.

[0030] Figure 3 The infinite element domain, air domain, grounding, and three-phase location are set in the model;

[0031] Figure 4 This is a schematic diagram showing the angle between the power transmission line and the grape trellis wire at 0°.

[0032] Figure 5 This is a schematic diagram showing the angle between the power transmission line and the grape trellis wire at 90°.

[0033] Figure 6 The current flowing through the conductor in the simulation;

[0034] Figure 7 The potential on the suspended conductor in the simulation;

[0035] Figure 8 A schematic diagram of the modular structure of the design device provided by the present invention;

[0036] Figure 9 A schematic diagram of the structure of the computer device provided by the present invention.

[0037] In the attached diagram: 1. Air domain, 2. Wire, 3. Infinite element domain, 4. Ground, 5. Phase A conductor, 6. Phase B conductor, 7. Phase C conductor. Detailed Implementation

[0038] To make the objectives and technical solutions of this invention clearer and easier to understand, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Example 1

[0041] This embodiment uses a grape trellis as an example to illustrate the design method of the present invention.

[0042] Based on the design method of crop support for safety against inductive electric shock, a model containing high-voltage transmission lines and metal grape trellises is established through finite element simulation calculation. The total induced energy on the grape trellises is calculated under different arrangements of metal grape trellises. The main arrangement parameters include the length of the metal grape trellis wire, the angle between the wire and the conductor, the height of the wire, and the diameter of the wire. The arrangement of the grape trellis with the smaller induced energy value is selected to achieve the design goals of economy and safety.

[0043] Reference Figure 1 A method for designing crop support racks based on inductive electric shock safety includes the following steps:

[0044] Step 1: In the COMSOL multiphysics simulation software, select the current module, circuit module, frequency domain calculation module, and transient calculation module to be used.

[0045] Step 2: In COMSOL multiphysics simulation software, establish the overall model as follows: Figure 2 As shown, the overall model includes a power transmission line model and a grape trellis model, and includes the following steps:

[0046] 1) Establish a transmission line model: The transmission line model includes 6 transmission conductors: two A-phase transmission conductors, two B-phase transmission conductors, and two C-phase transmission conductors. The material of the transmission conductors is aluminum.

[0047] 2) Establish a grape trellis model: Construct a suspended conductor group directly below the transmission line according to the general arrangement of a grape trellis. The suspended conductor group includes multiple parallel suspended conductors used to simulate the iron wires that make up the grape trellis. The material is iron. Set the initial values ​​of the suspension conductor arrangement parameters, including the wire length, the height of the wire from the ground, and the angle between the wire and the transmission line.

[0048] Step 3, refer to Figure 3 A cuboid air domain 1 is established outside the overall model. For the established air domain 1, the two faces where the transmission conductors penetrate vertically are set as electrically insulated under the current module, and the other four faces are set as grounded. Then, voltages are applied to phase A conductor 5, phase B conductor 6, and phase C conductor 7 according to different phase sequences to simulate the operating state of the transmission conductors.

[0049] Step 4: Create a mesh for the overall model. Create swept meshes for the sides of the suspended conductor group and transmission lines in the overall model, and create free tetrahedral meshes for the end faces of the suspended conductors and transmission lines; also create free tetrahedral meshes for the other parts of the model.

[0050] Step 5: Using the current module selected in Step 1, and the swept and free tetrahedral meshes established in Step 4, calculate the induced voltage values ​​at both ends of the suspended conductor in the frequency domain calculation module. Then, successively change the height, length, and angle between the wire and the transmission line, keeping the other two parameters unchanged, and re-establish the swept and free tetrahedral meshes and recalculate the induced voltage values ​​at both ends of the suspended conductor.

[0051] The rules for changing the height, length, and angle between the wire and the power transmission line are as follows:

[0052] The height of the wire varies from 1.5m to 4m, with a step length of 0.5m.

[0053] The length of the wire varies from 10m to 50m, with a step length of 10m.

[0054] The angle between the wire and the transmission line varies from 0° to 90°, with a step size of 15°. The model with an angle of 0° between the wire and the transmission line is shown in Figure 4, and the model with an angle of 0° between the wire and the transmission line is shown in Figure 5.

[0055] Step 6: Compare the induced voltage values ​​at both ends of the suspended conductor under different arrangement parameters obtained in Step 5, and compare the induced voltage value of the suspended conductor with the smallest induced voltage value under the same arrangement parameters; take the height with the smallest induced voltage value when the length of the suspended conductor and the angle between the suspended conductor and the transmission line remain unchanged as the optimal height; take the length with the smallest induced voltage value when the height of the suspended conductor and the angle between the suspended conductor and the transmission line remain unchanged as the optimal length; take the angle between the suspended conductor and the transmission line with the smallest induced voltage value when the height and length of the suspended conductor remain unchanged as the optimal angle.

[0056] By comparing the induced voltage values ​​of various arrangement methods, the optimal arrangement of the wire was selected as follows: the height of the wire is 1.5m, the angle between the wire and the transmission line is 90°, the length of the wire is 50m, and it is located directly below the transmission line.

[0057] Step 7: Calculate the current flowing through the human body when it touches the suspended conductor using the circuit module and transient calculation module from Step 1. The specific calculation method is as follows: In the circuit module, transform the human body and transmission line model into a circuit model, analogizing the human body to a resistor, and calculate the current flowing through the resistor in the circuit, which is the current flowing through the human body. Calculate the induced energy value of the suspended conductor flowing into the ground at the instant of grounding based on the current to verify the correctness of the arrangement selected in Step 6. If the induced energy value of the suspended conductor flowing into the ground at the instant of grounding is less than 25mJ, it indicates that the arrangement obtained in Step 6 is reasonable. Simultaneously measure the induced voltage value at both ends of the wire to obtain the change in the induced voltage on the wire. In Step 3, when calculating the potential of the suspended conductor, one of the following six different voltage methods can be applied to the transmission line.

[0058] Loading method 1:

[0059]

[0060] Loading method 2:

[0061]

[0062] Loading method 3:

[0063]

[0064] Loading method 4:

[0065]

[0066] Loading method 5:

[0067]

[0068] Loading method 6:

[0069]

[0070] Figure 6 When the wire length is 5m, the current flowing through the human body resistance calculated in step 7 will be... Figure 3 Integrating the current over time yields the amount of charge flowing into the ground during a transient electric shock. Using the formula from step 7, the energy flowing into the ground can then be calculated.

[0071] Figure 7 The graph in step 7 shows the change in induced voltage on the wire when a transient electric shock occurs, with the wire grounded at 0s. The induced voltage on the wire drops rapidly to 0V.

[0072] Example 2

[0073] Reference Figure 8 A crop support device, comprising:

[0074] The input module is used to receive the initial layout parameters of the crop racks and transmit the initial layout parameters of the crop racks to the processing module.

[0075] The processing module is used to obtain multiple sets of arrangement parameters based on the initial arrangement parameters and the variation law of the set arrangement parameters, calculate the induced voltage values ​​at both ends of the crop bracket under each arrangement parameter, and then select the final arrangement parameters of the crop bracket based on the induced voltage at both ends of the crop bracket.

[0076] The display module is used to display the selected crop rack arrangement parameters.

[0077] Example 3

[0078] Reference Figure 9 The present invention provides a computer device comprising an electrically connected memory and a processor, wherein the memory stores a computer program executable on the processor, and when the processor executes the computer program, it implements the steps of the grape trellis design method described above. For example... Figure 1 The steps shown. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the above-described device embodiments.

[0079] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention.

[0080] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0081] The memory can be used to store the computer program and / or module. The processor implements various functions of the design device / terminal equipment by running or executing the computer program and / or module stored in the memory and by calling the data stored in the memory.

[0082] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0083] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for designing a crop cradle based on safety from electric shock, characterized by, Includes the following steps: S1. Establish an overall model, which includes a power transmission line model and a crop support model. The power transmission line model is located above the crop support model. The power transmission line model includes two A-phase power transmission lines, two B-phase power transmission lines, and two C-phase power transmission lines. The crop support model includes multiple parallel suspended conductors and initial values ​​for the arrangement parameters of the suspended conductors, including the length of the suspended conductors, the height of the suspended conductors from the ground, and the angle between the suspended conductors and the power transmission lines. S2. Establish an air domain outside the overall model. For the established air domain, set the two sides where the transmission line penetrates vertically as electrically insulated and the other four sides as grounded. Then, apply voltages in phase A, phase B and phase C conductors according to different phase sequences to simulate the operation of the transmission line. S3. Create swept meshes on the sides of the suspended conductor and transmission line, and create free tetrahedral meshes on the end faces of the suspended conductor and transmission line; also create free tetrahedral meshes on the other parts of the overall model. S4. Using the swept and free tetrahedral meshes established in S3, calculate the induced voltage values ​​at both ends of each suspended conductor; change the height, length, and angle between the suspended conductor and the transmission line in sequence, while keeping the other two parameters unchanged, re-establish the swept and free tetrahedral meshes, and recalculate the induced voltage values ​​at both ends of each suspended conductor under the new arrangement parameters. S5. Compare the induced voltage values ​​at both ends of the suspended conductor under different arrangement parameters obtained in S4. Take the induced voltage value of the suspended conductor with the smallest induced voltage value under the same arrangement parameters for comparison. Select the optimal arrangement parameters based on the comparison results.

2. The method of designing an inductive electric shock safe crop cradle as claimed in claim 1, wherein, In step S1, an overall model is established in the COMSOL multiphysics simulation software.

3. The inductive electric shock safety based crop cradle design method as claimed in claim 1, wherein, In step S4, the induced voltage values ​​at both ends of each suspended conductor are calculated using the frequency domain calculation module in the COMSOL multiphysics simulation software.

4. The method of designing an inductive electric shock safe crop cradle as claimed in claim 1, wherein, In S4, the height of the suspended conductor varies from 1.5m to 4m, the length of the suspended conductor varies from 10m to 50m, and the angle between the suspended conductor and the transmission line varies from 0° to 90°.

5. The inductive electric shock safety based crop cradle design method as claimed in claim 4, wherein, In S4, the height of the suspended conductor changes in step 0.5m; the length of the suspended conductor changes in step 10m; and the angle between the suspended conductor and the transmission line changes in step 15°.

6. The crop support design method based on inductive electric shock safety according to claim 1, characterized in that, In S5, the induced voltage values ​​at both ends of the suspended conductor under different arrangement parameters obtained in S4 are compared, and the induced voltage value of the suspended conductor with the smallest induced voltage value under the same arrangement parameters is compared: the height with the smallest induced voltage value when the length of the suspended conductor and the angle between the suspended conductor and the transmission line remain unchanged is taken as the selected height. The length with the minimum induced voltage value when the height of the suspended conductor and the angle between the suspended conductor and the transmission line remain constant is selected as the length; the angle between the suspended conductor and the transmission line with the minimum induced voltage value when the height and length of the suspended conductor remain constant is selected as the angle.

7. The inductive electric shock safety based crop cradle design method as claimed in claim 1, wherein, After step S5 is completed, the current flowing through the human body when the human body touches the suspended conductor under the selected arrangement parameters is calculated. Based on the current flowing through the human body, the induced energy value of the suspended conductor flowing into the ground at the moment of grounding is calculated to verify the arrangement parameters selected in step S6.

8. The method of designing an inductive electric shock safe crop cradle as claimed in claim 7, wherein, The formula for calculating the induced energy value is , is the current flowing through the human body, and R is the resistance value of the resistance equivalent to the human body.

9. A crop cradle design apparatus for implementing the method of claim 1, characterized by include: The input module is used to receive the initial layout parameters of the crop racks and transmit the initial layout parameters of the crop racks to the processing module. The processing module is used to obtain multiple sets of arrangement parameters based on the initial arrangement parameters and the variation law of the set arrangement parameters, calculate the induced voltage values ​​at both ends of the crop bracket under each arrangement parameter, and then select the final arrangement parameters of the crop bracket based on the induced voltage at both ends of the crop bracket. The display module is used to display the selected crop rack arrangement parameters.

10. A computer device, comprising: The method includes an electrically connected memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor, when executing the computer program, implements the steps of the method according to any one of claims 1-8.

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