Electromagnetic wave attenuation characteristic analysis method of switch equipment and storage medium

Abstract

The invention relates to an electromagnetic wave attenuation characteristic analysis method of switch equipment and a storage medium. The method comprises the following steps: establishing a three-dimensional geometric model according to the actual structure and size parameters of the switchgear; setting materials and physical parameters of the three-dimensional geometric model; setting the boundary of an electromagnetic multi-physical field for the three-dimensional geometric model; performing grid division on the three-dimensional geometric model; and simulating the propagation process of the electromagnetic waves in the multi-physical field in the three-dimensional geometric model to obtain attenuation characteristics and a waveform spectrogram. Compared with the prior art, the method has the advantages that modeling is carried out on a complex structure and various media in the switch equipment, attenuation characteristics of electromagnetic waves in multiple layers of media are accurately simulated in combination with multi-physics field coupling simulation, understanding of the electromagnetic wave propagation process is improved, and electromagnetic environment changes in the switch equipment are better captured; the coupling effect between the electromagnetic fields is comprehensively considered, and the multi-physical field interaction relationship in the switch equipment is accurately simulated.

Description

Technical Field

[0001] The invention relates to equivalent model simulation, and in particular to an electromagnetic wave attenuation characteristic analysis method and storage medium of a switch device. Background Art

[0002] As the demand for high reliability and high efficiency in power systems continues to increase, the performance and stability of gas insulated switchgear (GIS), as an important component of high-voltage power equipment, directly affect the safe operation of the power system. The electromagnetic wave propagation characteristics, sensor layout, and partial discharge positioning technology inside GIS are key factors to ensure the stable operation of the equipment. The propagation and attenuation characteristics of electromagnetic waves inside GIS have an important impact on the performance of the equipment and the stability of the system. Therefore, it is of great significance to study the attenuation characteristics of electromagnetic waves inside GIS.

[0003] In GIS equipment, due to the complexity of electrical components and multi-layer structures, the propagation of electromagnetic waves is usually affected by different media, resulting in changes and attenuation of the propagation path. The attenuation of electromagnetic waves is not only related to the material properties of the medium, such as conductivity, dielectric constant and magnetic permeability, but also affected by the complex geometry and uneven distribution inside the GIS. Existing simulation technologies usually ignore these multi-physics field coupling effects and cannot accurately capture the energy loss and attenuation during electromagnetic wave propagation.

[0004] Therefore, how to design a method that can accurately evaluate the electromagnetic wave attenuation characteristics of switching equipment is a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide an electromagnetic wave attenuation characteristic analysis method and storage medium for a switching device in order to overcome the defect of the above-mentioned prior art that the energy loss and attenuation during the electromagnetic wave propagation process cannot be accurately captured.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a method for analyzing electromagnetic wave attenuation characteristics of a switch device is provided, which specifically comprises the following steps:

[0008] Step S1, establishing a three-dimensional geometric model according to the actual structure and size parameters of the switchgear;

[0009] Step S2, setting the material and physical parameters of the three-dimensional geometric model;

[0010] Step S3, setting the boundary of the electromagnetic multi-physics field for the three-dimensional geometric model;

[0011] Step S4, meshing the three-dimensional geometric model;

[0012] Step S5, simulating the propagation process of the electromagnetic wave in the multi-physical field in the three-dimensional geometric model to obtain the attenuation characteristics and waveform spectrum diagram.

[0013] As a preferred technical solution, in step S1, the switchgear is a gas-insulated switchgear, including a housing, a coaxial conductor, a probe and a local discharge source; the gas-insulated switchgear is filled with insulating gas, and the three-dimensional geometric model of the gas-insulated switchgear includes a linear type, an L-type and a T-type.

[0014] As a preferred technical solution, the grid division method in step S4 includes fine grid division and uniform grid division, and the grid area of ​​the fine grid division is smaller than the grid area of ​​the uniform grid division.

[0015] As a preferred technical solution, in the step S4, the probes and local discharge sources in the linear three-dimensional geometric model are finely meshed, and other areas are uniformly meshed; the probes, local discharge sources and the L-shaped turning area in the L-shaped three-dimensional geometric model are finely meshed, and other areas are uniformly meshed; the probes, local discharge sources and the area near the T-shaped intersection in the T-shaped three-dimensional geometric model are finely meshed, and other areas are uniformly meshed.

[0016] As a preferred technical solution, in step S2, the material of the three-dimensional geometric model includes metal material and insulating gas.

[0017] As a preferred technical solution, the physical parameters of the insulating gas vary with changes in pressure and temperature.

[0018] As a preferred technical solution, in step S2, the physical parameters include electrical conductivity, dielectric constant and magnetic permeability.

[0019] As a preferred technical solution, in step S3, radiation boundary conditions are used to simulate the propagation of electromagnetic waves and eliminate reflections of electromagnetic waves at the boundaries of the three-dimensional geometric model.

[0020] As a preferred technical solution, the step S5 specifically includes the following steps:

[0021] Step S501, calculating the characteristic distribution of electromagnetic multi-physics fields;

[0022] Step S502, calculating the attenuation of the electromagnetic wave in each structure of the three-dimensional geometric model;

[0023] Step S50, obtaining the attenuation characteristics and waveform spectrum of the electromagnetic wave.

[0024] According to another aspect of the present invention, a computer-readable storage medium is provided, on which a program is stored. When the program is executed by a processor, a method for analyzing electromagnetic wave attenuation characteristics of a switching device is implemented.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) The present invention models the complex internal structure and multiple media of the switchgear, and combines multi-physical field coupling simulation to accurately simulate the propagation, attenuation and energy loss characteristics of electromagnetic waves in multi-layer media, effectively improving the understanding of the electromagnetic wave propagation process and better capturing the electromagnetic environment changes in the switchgear; the present invention comprehensively considers the coupling between electromagnetic fields, accurately simulates the multi-physical field interaction relationship inside the switchgear, and can provide a theoretical basis for the optimization of sensor layout by simulating and analyzing the propagation characteristics of electromagnetic waves inside the switchgear;

[0027] 2) The present invention uses three equivalent models: linear, L-shaped and T-shaped models to accurately model the geometry of different parts inside the GIS, and combines different grid division methods to make the simulation results more accurate; the conductivity and dielectric constant of the insulating gas take into account the gas pressure and temperature factors to ensure the simulation accuracy; the radiation boundary conditions are used to simulate the propagation of electromagnetic waves, which can effectively eliminate the reflection of electromagnetic waves at the boundaries of the three-dimensional geometric model and avoid the influence of the boundaries on the simulation results. The present invention also provides strong support for the accurate positioning of partial discharge. By accurately simulating the propagation and attenuation of electromagnetic waves, it can more efficiently identify and locate the source of partial discharge and ensure the safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a flow chart of a method for analyzing electromagnetic wave attenuation characteristics of a switch device according to the present invention;

[0029] Figure 2 It is a structural schematic diagram of a linear three-dimensional geometric model of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the L-shaped three-dimensional geometric model of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the T-shaped three-dimensional geometric model of the present invention;

[0032] Figure 5 A schematic diagram of mesh division of a linear three-dimensional geometric model of the present invention;

[0033] Figure 6 Schematic diagram of mesh division of the L-shaped three-dimensional geometric model of the present invention;

[0034] Figure 7A schematic diagram of mesh division of a T-shaped three-dimensional geometric model of the present invention;

[0035] Figure 8 The electric field intensity diagram measured by the probe of the linear three-dimensional geometric model of the present invention;

[0036] Fig. 9 The electric field intensity diagram measured by the probe of the L-shaped three-dimensional geometric model of the present invention;

[0037] Fig.10 The electric field intensity diagram measured by the probe of the T-shaped three-dimensional geometric model of the present invention;

[0038] Fig.11 It is a graph showing the electromagnetic wave attenuation characteristic of different types of three-dimensional geometric models of the present invention. DETAILED DESCRIPTION

[0039] 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 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 should fall within the scope of protection of the present invention.

[0040] Example 1

[0041] like Figure 1 As shown, the present invention provides a method for analyzing electromagnetic wave attenuation characteristics of a switch device, wherein the switch device is a gas insulated switch device (GIS), and the details are as follows.

[0042] Step 1: construct a 3D geometric model of GIS at 110 kV voltage level. Figure 2 As shown in the figure, the inner diameter of the shell and the outer diameter of the busbar are determined with reference to the IEC62271-203 (high-voltage gas-insulated switchgear) standard, and a linear three-dimensional geometric model of the GIS is constructed in SolidWorks, with a total cavity length of 6m. Radiation is carried out through a dipole antenna with a height of 15mm placed on the high-voltage conductor 500mm away from the head end. The UHF electromagnetic wave is detected by a point probe with an internal resistance of 50Ω.

[0043] Step 2: Material division and parameter setting for the geometric model of GIS. The gas-insulated switchgear includes a housing, a coaxial conductor, a probe, and a local discharge source. The housing and the coaxial conductor are made of metal materials, specifically copper. The gas-insulated switchgear is filled with insulating gas, which is SF6 gas. The parameter setting includes physical parameters such as the electrical conductivity, dielectric constant, and magnetic permeability of the housing. The electrical conductivity and dielectric constant of the insulating gas should take into account factors such as gas pressure and temperature to ensure simulation accuracy.

[0044] Step 3, set the physical boundary of the GIS simulation model. The local discharge source uses a Gaussian pulse current source. At the external boundary of the model, in order to effectively eliminate the reflection of electromagnetic waves at the boundary and avoid the influence of the boundary on the simulation results, the radiation boundary condition can be used to simulate the propagation of electromagnetic waves. In the model, the electric field radiation boundary condition is set on the high-voltage conductor at a distance of 500 mm from the source, and the radiation direction is along the radial direction of the GIS.

[0045] Step 4: Mesh the model according to the multi-physics field coupling. Figure 5 As shown in Figure 1, the probe and the local discharge source are divided into fine meshes, and other areas are divided into uniform meshes. The mesh area of ​​the fine mesh is smaller than the mesh area of ​​the uniform mesh.

[0046] Step 5, obtain the attenuation characteristics and field intensity time domain diagram of electromagnetic waves under different structures. Figure 8 As shown in the figure, simulation is performed in the model to calculate the characteristic distribution of electric and magnetic physical fields, and then the attenuation characteristics of electromagnetic waves inside GIS are obtained, providing a theoretical basis for its optimal design. Fig.11 As shown, through the GIS multi-physical field coupling simulation modeling of the present invention, the attenuation of electromagnetic waves in each structure of GIS can be calculated, showing the attenuation process of electromagnetic waves in the internal structure.

[0047] Example 2

[0048] like Figure 1 As shown, the present invention provides a method for analyzing electromagnetic wave attenuation characteristics of a switch device, wherein the switch device is a gas insulated switch device (GIS), and the details are as follows.

[0049] Step 1: construct a 3D geometric model of GIS at 110 kV voltage level. Figure 3 As shown in the figure, the inner diameter of the shell and the outer diameter of the busbar are determined with reference to the IEC62271-203 (high-voltage gas-insulated switchgear) standard, and the L-shaped three-dimensional geometric model of the GIS is constructed in SolidWorks, with a total cavity length of 6m. The dipole antenna with a height of 15mm placed on the high-voltage conductor 500mm away from the head end is used for radiation. The UHF electromagnetic wave is detected by a point probe with an internal resistance of 50Ω.

[0050] Step 2: Material division and parameter setting for the geometric model of GIS. The gas-insulated switchgear includes a housing, a coaxial conductor, a probe, and a local discharge source. The housing and the coaxial conductor are made of metal materials, specifically copper. The gas-insulated switchgear is filled with insulating gas, which is SF6 gas. The parameter setting includes physical parameters such as the electrical conductivity, dielectric constant, and magnetic permeability of the housing. The electrical conductivity and dielectric constant of the insulating gas should take into account factors such as gas pressure and temperature to ensure simulation accuracy.

[0051] Step 3, set the physical boundary of the GIS simulation model. The local discharge source uses a Gaussian pulse current source. At the external boundary of the model, in order to effectively eliminate the reflection of electromagnetic waves at the boundary and avoid the influence of the boundary on the simulation results, the radiation boundary condition can be used to simulate the propagation of electromagnetic waves. In the model, the electric field radiation boundary condition is set on the high-voltage conductor at a distance of 500 mm from the source, and the radiation direction is along the radial direction of the GIS.

[0052] Step 4: Mesh the model according to the multi-physics field coupling. Figure 6 As shown in the figure, the probe, partial discharge source and L-shaped turning areas are divided into fine grids, and other areas are divided into uniform grids. The grid area of ​​the fine grid division is smaller than the grid area of ​​the uniform grid division.

[0053] Step 5, obtain the attenuation characteristics and field intensity time domain diagram of electromagnetic waves under different structures. Fig. 9 As shown in the figure, simulation is performed in the model to calculate the characteristic distribution of electric and magnetic physical fields, and then the attenuation characteristics of electromagnetic waves inside GIS are obtained, providing a theoretical basis for its optimal design. Fig.11 As shown, through the GIS multi-physical field coupling simulation modeling of the present invention, the attenuation of electromagnetic waves in each structure of GIS can be calculated, showing the attenuation process of electromagnetic waves in the internal structure.

[0054] Example 3

[0055] like Figure 1 As shown, the present invention provides a method for analyzing electromagnetic wave attenuation characteristics of a switch device, wherein the switch device is a gas insulated switch device (GIS), and the details are as follows.

[0056] Step 1: construct a 3D geometric model of GIS at 110 kV voltage level. Figure 4 As shown in the figure, the inner diameter of the shell and the outer diameter of the busbar are determined with reference to the IEC62271-203 (high-voltage gas-insulated switchgear) standard, and the T-shaped three-dimensional geometric model of the GIS is constructed in SolidWorks, with a total cavity length of 6m. The radiation is carried out through a dipole antenna with a height of 15mm placed on the high-voltage conductor 500mm away from the head end. The ultra-high frequency electromagnetic waves are detected by a point probe with an internal resistance of 50Ω.

[0057] Step 2: Material division and parameter setting for the geometric model of GIS. The gas-insulated switchgear includes a housing, a coaxial conductor, a probe, and a local discharge source. The housing and the coaxial conductor are made of metal materials, specifically copper. The gas-insulated switchgear is filled with insulating gas, which is SF6 gas. The parameter setting includes physical parameters such as the electrical conductivity, dielectric constant, and magnetic permeability of the housing. The electrical conductivity and dielectric constant of the insulating gas should take into account factors such as gas pressure and temperature to ensure simulation accuracy.

[0058] Step 3, set the physical boundary of the GIS simulation model. The local discharge source uses a Gaussian pulse current source. At the external boundary of the model, in order to effectively eliminate the reflection of electromagnetic waves at the boundary and avoid the influence of the boundary on the simulation results, the radiation boundary condition can be used to simulate the propagation of electromagnetic waves. In the model, the electric field radiation boundary condition is set on the high-voltage conductor at a distance of 500 mm from the source, and the radiation direction is along the radial direction of the GIS.

[0059] Step 4: Mesh the model according to the multi-physics field coupling. Figure 7 As shown in the figure, the area near the probe, partial discharge source and T-junction is divided into fine meshes, and the other areas are divided into uniform meshes. The mesh area of ​​the fine mesh is smaller than the mesh area of ​​the uniform mesh.

[0060] Step 5, obtain the attenuation characteristics and field intensity time domain diagram of electromagnetic waves under different structures. Fig.10 As shown in the figure, simulation is performed in the model to calculate the characteristic distribution of electric and magnetic physical fields, and then the attenuation characteristics of electromagnetic waves inside GIS are obtained, providing a theoretical basis for its optimal design. Fig.11 As shown, through the GIS multi-physical field coupling simulation modeling of the present invention, the attenuation of electromagnetic waves in each structure of GIS can be calculated, showing the attenuation process of electromagnetic waves in the internal structure.

[0061] Example 4

[0062] The present invention provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, a method for analyzing the electromagnetic wave attenuation characteristics of a switching device is implemented.

[0063] Through multi-physical field coupling analysis, the present invention can accurately calculate the attenuation characteristics of electromagnetic waves in different GIS structures, further optimize the layout of UHF sensors, improve their performance and reliability, and thus ensure the safe and stable operation of the power system.

[0064] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for analyzing electromagnetic wave attenuation characteristics of a switch device, characterized in that: The specific steps include: Step S1, establishing a three-dimensional geometric model according to the actual structure and size parameters of the switchgear; Step S2, setting the material and physical parameters of the three-dimensional geometric model; Step S3, setting the boundary of the electromagnetic multi-physics field for the three-dimensional geometric model; Step S4, meshing the three-dimensional geometric model; Step S5, simulating the propagation process of the electromagnetic wave in the multi-physical field in the three-dimensional geometric model to obtain the attenuation characteristics and waveform spectrum diagram.

2. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 1, characterized in that: In the step S1, the switchgear is a gas-insulated switchgear, including a housing, a coaxial conductor, a probe and a local discharge source; the gas-insulated switchgear is filled with insulating gas, and the three-dimensional geometric model of the gas-insulated switchgear includes a linear type, an L-type and a T-type.

3. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 2, characterized in that: The grid division method in step S4 includes fine grid division and uniform grid division, and the grid area of ​​the fine grid division is smaller than the grid area of ​​the uniform grid division.

4. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 3, characterized in that: In the step S4, the probe and the local discharge source in the linear three-dimensional geometric model are divided into fine grids, and the other areas are divided into uniform grids; the probe, the local discharge source and the L-shaped turning area in the L-shaped three-dimensional geometric model are divided into fine grids, and the other areas are divided into uniform grids; the probe, the local discharge source and the area near the T-shaped intersection in the T-shaped three-dimensional geometric model are divided into fine grids, and the other areas are divided into uniform grids.

5. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 1, characterized in that: In the step S2, the material of the three-dimensional geometric model includes metal material and insulating gas.

6. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 5, characterized in that: The physical parameters of the insulating gas vary with pressure and temperature.

7. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 1, characterized in that: In the step S2, the physical parameters include electrical conductivity, dielectric constant and magnetic permeability.

8. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 1, characterized in that: In the step S3, the radiation boundary condition is used to simulate the propagation of electromagnetic waves and eliminate the reflection of electromagnetic waves at the boundary of the three-dimensional geometric model.

9. The method for analyzing electromagnetic wave attenuation characteristics of a switch device according to claim 1, characterized in that: The step S5 specifically includes the following steps: Step S501, calculating the characteristic distribution of electromagnetic multi-physics fields; Step S502, calculating the attenuation of the electromagnetic wave in each structure of the three-dimensional geometric model; Step S50, obtaining the attenuation characteristics and waveform spectrum of the electromagnetic wave.

10. A computer-readable storage medium, characterized in that: A program is stored thereon, and when the program is executed by a processor, the analysis method described in claim 1 is implemented.

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