A method for calculating the electric field intensity on the surface of overhead transmission line conductors

Abstract

The present invention discloses a method for calculating the electric field intensity on the surface of an overhead transmission line conductor. A cylindrical two-dimensional infinite length simplified model is used to calculate the conductor size and the voltage to obtain multiple initial equipotential surfaces, a three-dimensional model is constructed using the initial equipotential surfaces, and the electric field intensity on the surface of the first conductor and the first electric field distribution size are calculated. The size of the initial equipotential surface is iteratively adjusted, and the adjusted initial equipotential surface is used as an input boundary condition to update the three-dimensional model, and then the electric field intensity on the surface of the first conductor and the first electric field distribution size are updated, until the difference between the electric field intensity on the surface of the first conductor between two iterations meets the preset requirements, and the updated electric field intensity on the surface of the first conductor and the first electric field distribution size are output. The method obtains relatively small equipotential surfaces by using an analytical method, and then performs local finite element analysis, thereby realizing refined modeling and calculation of complex local details of overhead transmission lines with large size ratio structures.

Description

Technical Field

[0001] The invention relates to the technical field of electric field strength calculation, and in particular to a method for calculating the electric field strength on the surface of an overhead power transmission line conductor. Background Art

[0002] The existing methods for calculating the electric field strength on the surface of overhead transmission line conductors are mainly based on analytical methods, and those widely used in domestic and foreign power grids include: simulated charge method, Maxwell coefficient method, and continuous mapping method.

[0003] Due to the solution characteristics of the existing analytical method, the main method for calculating the surface electric field strength needs to make the following assumptions: ignore the sag effect of overhead transmission lines, ignore the influence of the strand type of overhead transmission lines on the surface electric field strength, ignore the influence of surface dirt, attached raindrops, metal protrusions, etc. on the electric field strength distribution of overhead transmission lines, ignore the proximity effect of towers on high-voltage wires, ignore the influence of ground protrusions or vegetation on the electric field strength, and ignore the influence of ground soil conductivity on the electric field strength calculation. After the above assumptions, the calculation of the surface electric field strength of overhead transmission line conductors is simplified to a two-dimensional plane calculation. Assuming that the overhead transmission line conductor is an infinitely long cylindrical structure and the ground is an infinitely extended smooth plane with zero potential, the entire calculation can be simplified to a two-dimensional electric field strength calculation problem on the cross section of the transmission line.

[0004] However, the existing technology ignores many factors that affect the calculation results of the electric field strength on the surface of overhead transmission lines, so the calculation results are not accurate enough. In particular, the key factors of the conductor surface strand type and surface protrusions cannot be effectively calculated and analyzed, resulting in the calculation results of the electric field strength on the surface of overhead transmission lines failing to reflect the actual situation. The existing electromagnetic environment assessment calculation methods all use the electric field strength on the conductor surface as the input of the empirical formula, which seriously affects the accuracy of the electromagnetic environment assessment calculation of the existing overhead transmission lines. If different assessment methods are used for the same transmission line, the assessment error of electromagnetic environment quantities such as audible noise may even exceed 30%. Summary of the invention

[0005] The present invention provides a method for calculating the electric field strength on the surface of an overhead transmission line conductor. The method improves the accuracy of the calculation result of the electric field strength on the surface of the overhead transmission line conductor by combining a finite element method with an analytical method to perform local detail analysis on the overhead transmission line.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides an edge processing method for collecting high-frequency information of a station area, including:

[0007] Obtain conductor size and voltage of overhead transmission lines;

[0008] The cylindrical two-dimensional infinite length simplified model is called to calculate the wire size and the voltage to obtain N initial equipotential surfaces, where N is an integer greater than 1;

[0009] An initial equipotential surface is selected from N initial equipotential surfaces as an input boundary condition to construct a three-dimensional model, and a finite element method is used to calculate the first conductor surface electric field intensity and the first electric field distribution size of the conductor under preset conditions, wherein the preset conditions include different conductor strands, water attached to the conductor surface, and bulges on the conductor surface;

[0010] Iteratively adjust the size of the initial equipotential surface, and use the adjusted initial equipotential surface as an input boundary condition to update the three-dimensional model, and then update the electric field strength on the surface of the first conductor and the size of the first electric field distribution, until the difference in the electric field strength on the surface of the first conductor between two iterations meets the preset requirements, and output the updated electric field strength on the surface of the first conductor and the size of the first electric field distribution.

[0011] In this embodiment, the conductor size and voltage of the overhead transmission line are obtained, and a cylindrical two-dimensional infinite length simplified model is called to calculate the conductor size and the voltage to obtain multiple initial equipotential surfaces. The current initial equipotential surface is used as the initial equipotential surface of the input boundary condition to construct a three-dimensional model, and the finite element method is used to calculate the first conductor surface electric field strength and the first electric field distribution size of the conductor under preset conditions. The size of the initial equipotential surface is iteratively adjusted, and the adjusted initial equipotential surface is used as the input boundary condition to update the three-dimensional model, and then the first conductor surface electric field strength and the first electric field distribution size are updated until the difference in the first conductor surface electric field strength between two iterations meets the preset requirements, and the updated first conductor surface electric field strength and the first electric field distribution size are output. This method uses an analytical method to obtain relatively small equipotential surfaces, and then performs local finite element analysis, thereby achieving refined modeling and calculation of complex local details of overhead transmission lines with large aspect ratio structures.

[0012] As a preferred solution, it also includes:

[0013] If the preset requirement cannot be met after reaching the preset number of iterations, the size of the initial equipotential surface is iteratively adjusted until the preset requirement is met, and the updated first conductor surface electric field intensity and first electric field distribution size are output.

[0014] As a preferred solution, a cylindrical two-dimensional infinite length simplified model is used to calculate the wire size and voltage to obtain N initial equipotential surfaces, specifically:

[0015] The wire size and voltage are calculated using the continuous mapping method to obtain the first initial equipotential surface in the two-dimensional plane;

[0016] The second initial equipotential surface in a two-dimensional plane is obtained by using a simulated charge method according to the influence of the sag effect on the wire size and the voltage.

[0017] As a preferred solution, the size of the initial equipotential surface is adjusted as follows:

[0018] The size ratio is obtained by calculating the initial equipotential surface as the input boundary condition to construct a complex three-dimensional model;

[0019] The adjusted equipotential surface is obtained by reducing the size ratio of the initial equipotential surface by 10%.

[0020] As a preferred solution, until the difference in the electric field strength on the surface of the first conductor between two iterations meets a preset requirement, specifically:

[0021] The difference in the electric field strength on the surface of the first conductor between two iterations is less than 1%.

[0022] As a preferred solution, in order to solve the same technical problem, an embodiment of the present invention further provides a device for calculating the electric field strength on the surface of an overhead transmission line conductor, including a data acquisition module, an initial equipotential surface calculation module, a three-dimensional model construction module and an adjustment module.

[0023] Wherein, the data acquisition module is used to obtain the conductor size and voltage of the overhead transmission line;

[0024] The initial equipotential surface calculation module is used to call a cylindrical two-dimensional infinite length simplified model to calculate the wire size and the voltage to obtain N initial equipotential surfaces, where N is an integer greater than 1;

[0025] The three-dimensional model building module is used to select an initial equipotential surface from N initial equipotential surfaces as an input boundary condition to build a three-dimensional model, and use the finite element method to calculate the first wire surface electric field intensity and the first electric field distribution size of the wire under preset conditions, wherein the preset conditions include different wire strands, water attached to the wire surface, and bulges on the wire surface;

[0026] The adjustment module is used to iteratively adjust the size of the initial equipotential surface, and use the adjusted initial equipotential surface as an input boundary condition to update the three-dimensional model, and then update the electric field strength on the surface of the first conductor and the first electric field distribution size, until the difference in the electric field strength on the surface of the first conductor between two iterations meets the preset requirements, and output the updated electric field strength on the surface of the first conductor and the first electric field distribution size.

[0027] As a preferred solution, the initial equipotential surface calculation module includes a first equipotential surface unit and a second equipotential surface unit.

[0028] The first equipotential surface unit is used to calculate the wire size and voltage using a continuous mapping method to obtain the first initial equipotential surface in a two-dimensional plane;

[0029] The second equipotential surface unit is used to obtain the second initial equipotential surface in a two-dimensional plane according to the influence of the sag effect on the conductor size and voltage by using the simulated charge method.

[0030] As a preferred solution, the adjustment module includes a size ratio unit and an adjustment unit.

[0031] Among them, the size ratio unit is used to construct a three-dimensional model by taking the initial equipotential surface as the input boundary condition and then calculate the size ratio;

[0032] The adjustment unit is used to reduce the size ratio of the initial equipotential surface by 10% to obtain an adjusted equipotential surface.

[0033] As a preferred solution, in order to solve the same technical problem, an embodiment of the present invention also provides an overhead transmission line conductor surface electric field strength calculation device, including: a memory for storing a computer program, and a processor for implementing the overhead transmission line conductor surface electric field strength calculation method as shown in the embodiment of the present invention when executing the computer program.

[0034] As a preferred solution, in order to solve the same technical problem, an embodiment of the present invention further provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for calculating the surface electric field strength of an overhead transmission line conductor as shown in the embodiment of the present invention are implemented.

[0035] The present invention has the following beneficial effects:

[0036] The conductor size and voltage of the overhead transmission line are obtained, and a cylindrical two-dimensional infinite length simplified model is called to calculate the conductor size and the voltage, and multiple initial equipotential surfaces are obtained. The current initial equipotential surface is used as the initial equipotential surface of the input boundary condition to construct a three-dimensional model, and the finite element method is used to calculate the first conductor surface electric field strength and the first electric field distribution size of the conductor under preset conditions, and the size of the initial equipotential surface is iteratively adjusted, and the adjusted initial equipotential surface is used as the input boundary condition to update the three-dimensional model, and then the first conductor surface electric field strength and the first electric field distribution size are updated, until the difference between the first conductor surface electric field strength between two iterations meets the preset requirements, and the updated first conductor surface electric field strength and the first electric field distribution size are output. The method uses an analytical method to obtain relatively small equipotential surfaces, and then performs local finite element analysis, so as to achieve refined modeling and calculation of complex local details of overhead transmission lines with large size ratio structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 : A schematic flow chart of an embodiment of a method for calculating the electric field intensity on the surface of an overhead transmission line conductor provided by the present invention;

[0038] Figure 2 : A schematic diagram of a processing flow of an embodiment of a method for calculating the electric field intensity on the surface of an overhead transmission line conductor provided by the present invention;

[0039] Figure 3 : A schematic diagram of the device structure of an embodiment of the device for calculating the surface electric field strength of an overhead transmission line conductor provided by the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1

[0042] Please refer to Figure 1 , is a method for calculating the electric field strength on the surface of an overhead transmission line conductor provided by an embodiment of the present invention, and the method for calculating the electric field strength on the surface of an overhead transmission line conductor includes steps 101 to 105, and each step is specifically as follows:

[0043] Step 101: Obtain the conductor size and voltage of the overhead transmission line.

[0044] In this embodiment, the conductor size and voltage of the overhead power transmission line are obtained.

[0045] Step 102: calling a cylindrical two-dimensional infinite length simplified model to calculate the wire size and the voltage to obtain N initial equipotential surfaces, where N is an integer greater than 1.

[0046] Optionally, a cylindrical two-dimensional infinite length simplified model is called to calculate the wire size and the voltage to obtain N initial equipotential surfaces, specifically:

[0047] Using a continuous mapping method to calculate the wire size and voltage to obtain a first initial equipotential surface in a two-dimensional plane;

[0048] The second initial equipotential surface in a two-dimensional plane is obtained by using a simulated charge method according to the influence of the sag effect on the wire size and the voltage.

[0049] In this embodiment, if Figure 2As shown, firstly, the electric potential distribution characteristics around the conductor are calculated for the cylindrical two-dimensional infinite length simplified model using the simulated charge method and the continuous mapping method, the geometric shapes of the equipotential surfaces of different potentials are obtained, and the equipotential surfaces of specific voltage levels are optimized and selected as the input boundary conditions for the finite element simulation calculation. The conductor size and voltage are calculated using the continuous mapping method to obtain the equipotential surfaces in the two-dimensional plane, and the simulated charge method is used to obtain the equipotential surfaces in the two-dimensional plane according to the influence of the sag effect on the conductor size and the voltage. The analytical method can effectively calculate the electric field strength and potential distribution of geometric models with large size ratios, that is, the calculation domain and the minimum geometric size in the calculation domain, which is the ratio of the overall size of the tower to the outer diameter of the conductor in the calculation of the electric field strength on the surface of the overhead transmission line conductor.

[0050] Step 103: Select an initial equipotential surface from the N initial equipotential surfaces as an input boundary condition to construct a three-dimensional model, and use the finite element method to calculate the first wire surface electric field strength and the first electric field distribution size of the wire under preset conditions, wherein the preset conditions include different wire strands, water attached to the wire surface, and protrusions on the wire surface.

[0051] In this embodiment, the current initial equipotential surface is used as the initial equipotential surface of the input boundary condition to construct a three-dimensional model, and the wire is refined from the local complex structure. The finite element method is used to calculate the wire surface electric field strength and electric field distribution size under the conditions of different wire strands, water attached to the wire surface, and bulges on the wire surface, and the first wire surface electric field strength and the first electric field distribution size are obtained.

[0052] Step 104: Iteratively adjust the size of the initial equipotential surface, and use the adjusted initial equipotential surface as the input boundary condition to update the three-dimensional model, and then update the electric field strength on the surface of the first conductor and the first electric field distribution size, until the difference in the electric field strength on the surface of the first conductor between two iterations meets the preset requirements, and output the updated electric field strength on the surface of the first conductor and the first electric field distribution size.

[0053] Optionally, also include:

[0054] If the preset requirement cannot be met after reaching the preset number of iterations, the size of the initial equipotential surface is iteratively adjusted until the preset requirement is met, and the updated first conductor surface electric field intensity and first electric field distribution size are output.

[0055] Optionally, adjust the size of the initial equipotential surfaces, specifically:

[0056] The size ratio is obtained by calculating the initial equipotential surface as the input boundary condition to construct a complex three-dimensional model;

[0057] The adjusted equipotential surface is obtained by reducing the size ratio of the initial equipotential surface by 10%.

[0058] Optionally, until the difference in electric field strength on the surface of the first conductor between two iterations meets a preset requirement, specifically:

[0059] The difference in the electric field strength on the surface of the first conductor between two iterations is less than 1%.

[0060] In this embodiment, after obtaining the first conductor surface electric field intensity and the first electric field distribution size, the size of the initial equipotential surface is reduced by 10%, and the conductor surface electric field intensity is calculated within a smaller equipotential surface range. The equipotential surface after the size reduction is used as the equipotential surface of the input boundary condition to reconstruct the three-dimensional model, and the finite element method is used to calculate the updated first conductor surface electric field intensity and the updated first electric field distribution size under the conditions of different conductor strands, water attached to the conductor surface and convexity of the conductor surface, and the difference between the first conductor surface electric field intensity between two iterations is compared. If the difference is less than 1%, it is determined that the updated equipotential surface is the best calculation boundary, and the updated first conductor surface electric field intensity and the updated first electric field distribution size are output. If the preset number of iterations is reached and the preset requirements cannot be met, one initial equipotential surface is selected from N initial equipotential surfaces as the input boundary condition to construct the three-dimensional model, and then the size of the initial equipotential surface is iteratively reduced by 10% until the preset requirements are met, and the updated first conductor surface electric field intensity and the first electric field distribution size are output.

[0061] Embodiment 2

[0062] Accordingly, see Figure 3 , Figure 3 The present invention provides a schematic diagram of the structure of an overhead transmission line conductor surface electric field strength calculation device. As shown in the figure, the overhead transmission line conductor surface electric field strength calculation device includes a data acquisition module 301, an initial equipotential surface calculation module 302, a three-dimensional model construction module 303 and an adjustment module 304, wherein the specific units of each module are as follows:

[0063] The data acquisition module 301 is used to obtain the conductor size and voltage of the overhead transmission line;

[0064] The initial equipotential surface calculation module 302 is used to call a cylindrical two-dimensional infinite length simplified model to calculate the wire size and the voltage to obtain N initial equipotential surfaces, where N is an integer greater than 1;

[0065] The three-dimensional model construction module 303 is used to select an initial equipotential surface from N initial equipotential surfaces as an input boundary condition to construct a three-dimensional model, and use the finite element method to calculate the first wire surface electric field intensity and the first electric field distribution size of the wire under preset conditions, wherein the preset conditions include different wire strands, water attached to the wire surface, and bulges on the wire surface;

[0066] The adjustment module 304 is used to iteratively adjust the size of the initial equipotential surface, and use the adjusted initial equipotential surface as the input boundary condition to update the three-dimensional model, and then update the electric field strength on the surface of the first conductor and the first electric field distribution size, until the difference in the electric field strength on the surface of the first conductor between two iterations meets the preset requirements, and output the updated electric field strength on the surface of the first conductor and the first electric field distribution size.

[0067] Optionally, the initial equipotential surface calculation module 302 includes a first equipotential surface unit 3021 and a second equipotential surface unit 3022.

[0068] The first equipotential surface unit 3021 is used to calculate the wire size and the voltage using a continuous mapping method to obtain a first initial equipotential surface in a two-dimensional plane;

[0069] The second equipotential surface unit 3022 is used to obtain a second initial equipotential surface in a two-dimensional plane according to the influence of the sag effect on the wire size and the voltage by using a simulated charge method.

[0070] Optionally, the adjustment module 304 includes a size ratio unit 3041 and an adjustment unit 3042.

[0071] The size ratio unit 3041 is used to construct a complex three-dimensional model by taking the initial equipotential surface as an input boundary condition and then calculate the size ratio;

[0072] The adjusting unit 3042 is used to reduce the size ratio of the initial equipotential surface by 10% to obtain an adjusted equipotential surface.

[0073] Embodiment 3

[0074] Accordingly, the device for calculating the electric field strength on the surface of an overhead power transmission line conductor provided by the present invention comprises: a processor and a memory,

[0075] A computer program is stored in the memory, and the computer program is configured to be executed by a processor, and the processor performs operations corresponding to the method for calculating the surface electric field strength of an overhead transmission line conductor as shown in the first embodiment of the present application.

[0076] Embodiment 4

[0077] Accordingly, the present invention provides a storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the method for calculating the electric field strength on the surface of an overhead transmission line conductor as shown in the first embodiment are implemented.

[0078] Compared with the prior art, the present invention obtains the conductor size and voltage of the overhead transmission line, calls a cylindrical two-dimensional infinite length simplified model to calculate the conductor size and the voltage, obtains multiple initial equipotential surfaces, uses the current initial equipotential surface as the initial equipotential surface of the input boundary condition to construct a three-dimensional model, and uses the finite element method to calculate the first conductor surface electric field strength and the first electric field distribution size of the conductor under preset conditions, iteratively adjusts the size of the initial equipotential surface, and uses the adjusted initial equipotential surface as the input boundary condition to update the three-dimensional model, and then updates the first conductor surface electric field strength and the first electric field distribution size, until the difference between the first conductor surface electric field strength between two iterations meets the preset requirements, and outputs the updated first conductor surface electric field strength and the first electric field distribution size. The method uses the analytical method to obtain relatively small equipotential surfaces, and then performs local finite element analysis, so as to achieve refined modeling and calculation of complex local details of overhead transmission lines with large size ratio structures.

[0079] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for calculating the electric field strength on the surface of overhead transmission line conductors. It is characterized in that For overhead transmission lines with large aspect ratio structures, including: Obtain conductor size and voltage of overhead transmission lines; Calling a cylindrical two-dimensional infinite length simplified model to calculate the wire size and the voltage to obtain N initial equipotential surfaces, where N is an integer greater than 1; An initial equipotential surface is selected from N initial equipotential surfaces as an input boundary condition to construct a three-dimensional model, and a finite element method is used to calculate the first conductor surface electric field intensity and the first electric field distribution size of the conductor under preset conditions, wherein the preset conditions include different conductor strands, water attached to the conductor surface, and bulges on the conductor surface; Iteratively adjusting the size of the initial equipotential surface, and using the adjusted initial equipotential surface as an input boundary condition to update the three-dimensional model, and then updating the first wire surface electric field strength and the first electric field distribution size, until the difference between the first wire surface electric field strength between two iterations meets a preset requirement, and outputting the updated first wire surface electric field strength and the first electric field distribution size; The cylindrical two-dimensional infinite length simplified model is called to calculate the wire size and the voltage to obtain N initial equipotential surfaces, specifically: Using a continuous mapping method to calculate the wire size and the voltage to obtain a first initial equipotential surface in a two-dimensional plane; Using a simulated charge method, a second initial equipotential surface in a two-dimensional plane is obtained according to the influence of the sag effect on the size of the wire and the voltage; The iterative adjustment of the size of the initial equipotential surface is specifically as follows: The initial equipotential surface is used as an input boundary condition to construct a complex three-dimensional model and then the size ratio is calculated; The adjusted equipotential surface is obtained by reducing the size ratio of the initial equipotential surface by 10%.

2. A method for calculating the electric field strength on the surface of an overhead transmission line conductor as claimed in claim 1, It is characterized in that Also includes: If the preset requirement cannot be met after reaching the preset number of iterations, the size of the initial equipotential surface is iteratively adjusted until the preset requirement is met, and the updated first conductor surface electric field intensity and first electric field distribution size are output.

3. The method for calculating the electric field intensity on the surface of the overhead transmission line conductor according to claim 1, It is characterized in that The difference between the electric field strength on the surface of the first conductor between two iterations meets the preset requirement, specifically: The difference in the electric field strength on the surface of the first conductor between two iterations is less than 1%.

4. A device for calculating the electric field strength on the surface of an overhead transmission line conductor, It is characterized in that For overhead transmission lines with large size ratio structures, including data acquisition module, initial equipotential surface calculation module, three-dimensional model building module and adjustment module; Wherein, the data acquisition module is used to obtain the conductor size and voltage of the overhead transmission line; The initial equipotential surface calculation module is used to call a cylindrical two-dimensional infinite length simplified model to calculate the wire size and the voltage to obtain N initial equipotential surfaces, where N is an integer greater than 1; The three-dimensional model building module is used to select an initial equipotential surface from N initial equipotential surfaces as an input boundary condition to build a three-dimensional model, and use a finite element method to calculate the first wire surface electric field strength and the first electric field distribution size of the wire under preset conditions, wherein the preset conditions include different wire strands, water attached to the wire surface, and bulges on the wire surface; The adjustment module is used to iteratively adjust the size of the initial equipotential surface, and use the adjusted initial equipotential surface as an input boundary condition to update the three-dimensional model, and then update the first wire surface electric field strength and the first electric field distribution size, until the difference between the first wire surface electric field strength between two iterations meets the preset requirements, and output the updated first wire surface electric field strength and the first electric field distribution size; The initial equipotential surface calculation module includes a first equipotential surface unit and a second equipotential surface unit. The first equipotential surface unit is used to calculate the wire size and the voltage using a continuous mapping method to obtain a first initial equipotential surface in a two-dimensional plane; The second equipotential surface unit is used to obtain a second initial equipotential surface in a two-dimensional plane according to the influence of the sag effect on the size of the wire and the voltage by using a simulated charge method; The adjustment module includes a size ratio unit and an adjustment unit. Wherein, the size ratio unit is used to construct a three-dimensional model by taking the initial equipotential surface as an input boundary condition and then calculate the size ratio; The adjustment unit is used to reduce the size ratio of the initial equipotential surface by 10% to obtain an adjusted equipotential surface.

5. A device for calculating the electric field strength on the surface of overhead transmission line conductors, It is characterized in that include: Memory for storing computer programs; A processor, configured to implement the method for calculating the electric field strength on the surface of an overhead transmission line conductor as claimed in any one of claims 1 to 3 when executing the computer program.

6. A storage medium, It is characterized in that The storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for calculating the electric field strength on the surface of an overhead transmission line conductor as claimed in any one of claims 1 to 3.

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