Simulation methods, systems, media, and equipment for electric and temperature fields of power equipment.

Abstract

This invention discloses a simulation method, system, medium, and device for the electric and temperature fields of power equipment. The method includes: establishing a two-dimensional axisymmetric simulation model of the power equipment under seismic conditions; determining the electric field intensity distribution of the power equipment based on the two-dimensional axisymmetric simulation model; determining the dielectric loss of the insulating parts based on the electric field intensity distribution of the power equipment; establishing a three-dimensional eddy current field analysis model of the metal conductive parts of the power equipment under seismic conditions; determining the Joule loss of the metal conductive parts based on the three-dimensional eddy current field analysis model; adding the dielectric loss and Joule loss as heat sources to the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model; simulating the two-dimensional axisymmetric temperature field model at a preset ambient temperature and a preset oil temperature to determine the temperature field distribution of the power equipment; and determining the damage state of the power equipment under different seismic conditions by obtaining the electric and temperature field distributions within the electrical equipment under seismic conditions.

Description

Technical Field

[0001] This invention relates to the field of power equipment analysis technology, and in particular to a method, system, medium, and equipment for simulating the electric field and temperature field of power equipment. Background Technology

[0002] Earthquakes, as a natural disaster, can cause severe physical damage to electrical equipment due to their intense vibrations and ground motion, thereby affecting their electrical performance and safe operation. Therefore, assessing the failure modes and damage states of electrical equipment under seismic conditions is crucial for ensuring the stability and safety of power systems. Furthermore, with the continuous development of power systems, higher demands are being placed on the assessment of the electrical performance of electrical equipment. Especially under extreme conditions such as earthquakes, accurately assessing the damage state and electrical performance of electrical equipment has become an urgent technical problem to be solved.

[0003] While there are some existing methods for analyzing and evaluating power equipment under seismic loads, most of them are based on simplified models and assumptions, making it difficult to accurately reflect the complex response of power equipment under real seismic conditions and to quickly identify the equipment status. Summary of the Invention

[0004] Based on this, it is necessary to propose a simulation method, system, medium, and equipment for the electric field and temperature field of power equipment to address the above problems.

[0005] A simulation method for the electric field and temperature field of power equipment, the method comprising:

[0006] A two-dimensional axisymmetric simulation model of power equipment under seismic conditions is established, and the electric field intensity distribution of the power equipment is determined based on the two-dimensional axisymmetric simulation model.

[0007] The dielectric loss of the insulating parts is determined based on the electric field intensity distribution of the power equipment.

[0008] A three-dimensional eddy current field analysis model of the conductive metal parts of power equipment is established under seismic conditions, and the Joule loss of the conductive metal parts is determined based on the three-dimensional eddy current field analysis model.

[0009] The dielectric loss and Joule loss are added as heat sources to the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model.

[0010] The temperature field distribution of the power equipment is determined by simulating the two-dimensional axisymmetric temperature field model under preset ambient temperature and preset oil temperature.

[0011] Specifically, establishing a two-dimensional axisymmetric simulation model of the power equipment and determining the electric field intensity distribution of the power equipment based on the two-dimensional axisymmetric simulation model includes:

[0012] A two-dimensional axisymmetric simulation model of power equipment under seismic conditions was established.

[0013] The two-dimensional axisymmetric simulation model is divided into several first discrete units.

[0014] A phase voltage is applied to each of the first discrete units to determine the electric field intensity distribution of the power equipment.

[0015] Specifically, determining the dielectric loss of the insulating parts based on the electric field intensity distribution of the power equipment includes:

[0016] Based on the electric field intensity distribution of the power equipment, a dielectric loss model for the insulating part is determined. The dielectric loss model for the insulating part is as follows:

[0017] ;

[0018] Where P is the dielectric loss of the insulating part, M is the number of the first discrete units, and V i Let f be the unit volume, f be the operating frequency of the bushing, and E be the electric field strength. For dielectric loss factor, is the relative permittivity.

[0019] Obtain the current electric field intensity of the insulating part, input the dielectric loss model of the insulating part, and obtain the current dielectric loss of the insulating part.

[0020] Specifically, establishing a three-dimensional eddy current field analysis model of the conductive metal parts inside the bushing of the power equipment, and determining the Joule loss of the conductive metal parts based on the three-dimensional eddy current field analysis model, includes:

[0021] A three-dimensional eddy current field analysis model of power equipment is established based on the conductive metal parts inside the bushings of power equipment under seismic conditions.

[0022] The three-dimensional eddy field analysis model is divided into several second discrete units.

[0023] A power frequency current is applied to each of the second discrete units to obtain the power frequency current density within each second discrete unit.

[0024] The Joule loss of the conductive metal part is determined based on the density of the power frequency current in the second discrete unit.

[0025] Specifically, determining the Joule loss of the conductive metal part based on the density of the power frequency current within the second discrete unit includes:

[0026] The Joule loss model for the metal part is determined based on the density of the power frequency current within the second discrete unit. The Joule loss model for the metal part is as follows:

[0027] ;

[0028] in, For Joule loss, Let be the density of the power frequency current within the second discrete unit. Let N be the volume of the second discrete unit, and N be the total number of discrete units.

[0029] Obtain the density of the current power frequency current, input it into the Joule loss model of the metal part, and obtain the current Joule loss of the metal part.

[0030] The method further includes, after determining the temperature field distribution of the power equipment by simulating a two-dimensional axisymmetric temperature field model under preset ambient temperature and preset oil temperature, the method further includes:

[0031] The failure mode of the power equipment is determined by comparing the electric field intensity distribution with the voltage threshold and the temperature field distribution with the temperature threshold.

[0032] Specifically, determining the power equipment failure mode based on a comparison of the electric field intensity distribution and voltage threshold, and a comparison of the temperature field distribution and temperature threshold, includes:

[0033] When the electric field strength distribution of the power equipment reaches the voltage threshold, the failure mode of the power equipment is power equipment breakdown.

[0034] When the temperature field distribution of the power equipment reaches the temperature threshold, the failure mode of the power equipment is aging of the insulation material.

[0035] A simulation system for the electric and temperature fields of power equipment, the system comprising:

[0036] The module for determining the electric field intensity distribution of power equipment is used to establish a two-dimensional axisymmetric simulation model of power equipment under seismic conditions, and to determine the electric field intensity distribution of power equipment based on the two-dimensional axisymmetric simulation model.

[0037] The dielectric loss determination module for the insulating part is used to determine the dielectric loss of the insulating part based on the electric field intensity distribution of the power equipment.

[0038] The module for determining the Joule loss of conductive metal parts is used to establish a three-dimensional eddy current field analysis model of the conductive metal parts inside the bushings of power equipment under seismic conditions, and to determine the Joule loss of the conductive metal parts based on the three-dimensional eddy current field analysis model.

[0039] The two-dimensional axisymmetric temperature field model determination module is used to add the dielectric loss and Joule loss as heat sources into the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model.

[0040] The module for determining the temperature field distribution of power equipment is used to simulate and determine the temperature field distribution of power equipment under preset ambient temperature and preset oil temperature using a two-dimensional axisymmetric temperature field model.

[0041] A computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the steps of the method described above.

[0042] A computer device includes a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of the method described above.

[0043] The embodiments of the present invention have the following beneficial effects:

[0044] This invention first establishes a two-dimensional axisymmetric simulation model of power equipment under seismic conditions. This model fully considers the axisymmetric characteristics of the power equipment, thus more accurately reflecting the electric field distribution of the insulation components under seismic conditions, and consequently determining the dielectric loss. Furthermore, a three-dimensional eddy current field analysis model is established for the metallic conductive parts of the power equipment under seismic conditions. This model comprehensively reflects the eddy current distribution of the metallic conductive parts under seismic conditions, thereby accurately calculating the Joule loss.

[0045] Furthermore, by incorporating dielectric loss and Joule loss as heat sources into the two-dimensional axisymmetric simulation model, a two-dimensional axisymmetric temperature field model is determined. This enables coupled analysis of multiple physical fields (electric field, magnetic field, and temperature field) of power equipment, more accurately reflecting the actual operating state of the power equipment. Simulations of the two-dimensional axisymmetric temperature field model are performed at preset ambient and oil temperatures to obtain the temperature field distribution of the power equipment.

[0046] In summary, this invention can determine the damage state of power equipment under different earthquake conditions by obtaining the electric field and temperature field distribution inside the electrical equipment after the displacement of the components under earthquake conditions, thereby establishing the failure modes of power equipment under different earthquake intensities and evaluating the electrical performance of the power equipment. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] in:

[0049] Figure 1 A flowchart illustrating an embodiment of a simulation method for electric and temperature fields of power equipment provided by the present invention;

[0050] Figure 2 A flowchart illustrating another embodiment of the simulation method for electric and temperature fields of power equipment provided by the present invention;

[0051] Figure 3 A flowchart illustrating another embodiment of the simulation method for electric and temperature fields of power equipment provided by the present invention;

[0052] Figure 4 A schematic diagram of the structure of an embodiment of a simulation system for electric and temperature fields of power equipment provided by the present invention;

[0053] Figure 5 A schematic diagram of the structure of an embodiment of the device provided by the present invention;

[0054] Figure 6 A schematic diagram of the structure of an embodiment of the medium provided by the present invention. Detailed Implementation

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0056] like Figure 1 As shown, Figure 1 This is a flowchart illustrating an embodiment of a simulation method for the electric and temperature fields of power equipment provided by the present invention. The simulation method for the electric and temperature fields of power equipment includes:

[0057] S101: Establish a two-dimensional axisymmetric simulation model of power equipment under seismic conditions, and determine the electric field intensity distribution of the power equipment based on the two-dimensional axisymmetric simulation model.

[0058] For example, a two-dimensional axisymmetric simulation model of power equipment under seismic conditions is established; taking a 110kV oil-immersed bushing as an example, a two-dimensional axisymmetric simulation model of the oil-immersed bushing is established using COMSOL software, and boundary conditions are applied.

[0059] Furthermore, the physical field model added in the COMSOL software is an electric field. The two-dimensional axisymmetric simulation model of the oil-immersed bushing is divided into several first discrete elements. A phase voltage, i.e. a boundary condition, is applied to each first discrete element to determine the electric field intensity distribution of the oil-immersed bushing.

[0060] S102: Determine the dielectric loss of the insulation parts based on the electric field intensity distribution of the power equipment.

[0061] Furthermore, the dielectric loss of the insulation components is determined based on the electric field intensity distribution of the power equipment. When determining the dielectric loss of the insulation components, a dielectric loss model for the insulation components is established based on the electric field intensity distribution of the power equipment. The dielectric loss model for the insulation components is as follows:

[0062] ;

[0063] Where P is the dielectric loss of the insulating part, M is the number of the first discrete units, and V i Let f be the unit volume, f be the operating frequency of the bushing, and E be the electric field strength. For dielectric loss factor, is the relative permittivity.

[0064] Obtain the current electric field intensity of the insulating part, input the dielectric loss model of the insulating part, and obtain the current dielectric loss of the insulating part.

[0065] S103: Establish a three-dimensional eddy current field analysis model for the conductive metal parts of power equipment under seismic conditions, and determine the Joule loss of the conductive metal parts based on the three-dimensional eddy current field analysis model.

[0066] For example, a three-dimensional eddy current field analysis model of the power equipment is established based on the conductive metal parts inside the bushings under seismic conditions. Specifically, since two-dimensional planar graphics are not suitable for calculating eddy current fields, the calculation can only be performed in a three-dimensional eddy current field analysis model. In the three-dimensional eddy current field analysis model, the physical field model that needs to be added is the magnetic field. Under magnetic field conditions, only relative permeability and resistivity will affect the magnetic field. When performing three-dimensional eddy current field simulation calculations, it is only necessary to establish a three-dimensional eddy current field analysis model of the power equipment for the conductive metal parts, and set the power frequency current and boundary conditions.

[0067] Furthermore, the three-dimensional eddy current field analysis model is divided into several second discrete units; a power frequency current is applied to each second discrete unit to obtain the density of the power frequency current within each second discrete unit.

[0068] Furthermore, the Joule loss model for the metal part is determined based on the density of the power frequency current within the second discrete unit. The Joule loss model for the metal part is as follows:

[0069] ;

[0070] in, For Joule loss, Let be the density of the power frequency current within the second discrete unit. Let N be the volume of the second discrete unit, and N be the total number of discrete units.

[0071] Obtain the current power frequency current density, input it into the Joule loss model of the metal part, and obtain the current Joule loss of the metal part.

[0072] S104: Incorporate dielectric loss and Joule loss as heat sources into the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model.

[0073] For example, when calculating the temperature field of power equipment, it is necessary to use the solid heat transfer module in the COMSOL simulation software to consider the heat conduction effect between each material. The dielectric loss calculated in the electric field and the Joule loss calculated in the eddy current field are added as heat sources to the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model, and the heat transfer mode is set to heat transfer and heat convection, ignoring the influence of heat radiation.

[0074] S105: Under preset ambient temperature and preset oil temperature, simulate the two-dimensional axisymmetric temperature field model to determine the temperature field distribution of the power equipment.

[0075] For example, under pre-set ambient temperature and oil temperature, a two-dimensional axisymmetric temperature field model is simulated to determine the temperature field distribution of power equipment under seismic conditions.

[0076] As described above, this invention first establishes a two-dimensional axisymmetric simulation model of power equipment under seismic conditions. This two-dimensional axisymmetric model can fully consider the axisymmetric characteristics of the power equipment, thus more accurately reflecting the electric field distribution of the insulation parts under seismic conditions, and thereby determining the dielectric loss. Furthermore, a three-dimensional eddy current field analysis model is established for the metallic conductive parts of the power equipment under seismic conditions. This three-dimensional eddy current field analysis model comprehensively reflects the eddy current distribution of the metallic conductive parts of the power equipment under seismic conditions, thereby accurately calculating the Joule loss.

[0077] Furthermore, by incorporating dielectric loss and Joule loss as heat sources into the two-dimensional axisymmetric simulation model, a two-dimensional axisymmetric temperature field model is determined. This enables coupled analysis of multiple physical fields (electric field, magnetic field, and temperature field) of power equipment, more accurately reflecting the actual operating state of the power equipment. Simulations of the two-dimensional axisymmetric temperature field model are performed at preset ambient and oil temperatures to obtain the temperature field distribution of the power equipment.

[0078] In summary, this invention can determine the damage state of power equipment under different earthquake conditions by obtaining the electric field and temperature field distribution inside the electrical equipment after the displacement of the components under earthquake conditions, thereby establishing the failure modes of power equipment under different earthquake intensities and evaluating the electrical performance of the power equipment.

[0079] like Figure 2 As shown, Figure 2 This is a flowchart illustrating another embodiment of the simulation method for the electric and temperature fields of power equipment provided by the present invention. The simulation method for the electric and temperature fields of power equipment includes:

[0080] S201: Establish a two-dimensional axisymmetric simulation model of power equipment under seismic conditions.

[0081] For example, taking a 110kV oil-immersed bushing as an example, a two-dimensional axisymmetric simulation model of the oil-immersed bushing under seismic conditions is established using COMSOL software, and boundary conditions are applied. Specifically, since the bushing is strictly symmetrical about the conductor rod, for ease of calculation, a 1 / 2 bushing structure is selected to establish a two-dimensional axisymmetric simulation model. To reproduce the actual operating state of the bushing and ensure accurate calculation results, the air domain and oil tank can be set as rectangles, where the radial length is twice the outer diameter of the bushing. The sum of the lengths of the oil conservator and the upper porcelain sleeve is set as the axial length of the air domain, and the length of the lower porcelain sleeve is set as the axial length of the oil tank. The part below the bushing flange is immersed in it, and the electrode plates in the model are simplified to 13 layers. At the same time, the boundary conditions are set as follows: a phase voltage of 63kV is applied to the conductor rod, the top outlet device, and the bottom outlet device; a potential of 0 is applied to the oil tank, flange, outermost electrode plate, and the air boundary outside the bushing; and the electrode plates inside the capacitor core are set to floating potential.

[0082] S202: Divide the two-dimensional axisymmetric simulation model into several first discrete units.

[0083] S203: Apply phase voltage to each first discrete unit to determine the electric field intensity distribution of the power equipment.

[0084] For example, the physical field model added in COMSOL software is an electric field. The two-dimensional axisymmetric simulation model of the oil-immersed bushing is divided into several first discrete elements. Boundary conditions are applied to each first discrete element to determine the electric field intensity distribution of the oil-immersed bushing. When simulating under electric field conditions, the distribution of the bushing's electric field is related to the relative permittivity of the material inside the bushing. The relative permittivity of various materials in the bushing model is shown in Table 1.

[0085] Table 1. Relative permittivity of materials in the bushing.

[0086]

[0087] Simulations yielded the potential and electric field distribution of the bushing. The potential distribution shows that, under the influence of the aluminum foil plates in the capacitor core, the potential distribution is relatively uniform at the capacitor core and flange, but the potential changes drastically at the flange. The electric field distribution shows that the electric field inside the bushing is very low and uniform, with only the flange exhibiting a higher electric field strength, reaching a maximum of 77.2 kV / m. These electric field strength analyses indicate that the electric field distribution within the bushing is uniform, and the electric field strength on the porcelain bushing is below the breakdown field strength of air. Therefore, the bushing's safe operation is ensured during long-term use.

[0088] S204: Determine the dielectric loss of the insulation parts based on the electric field intensity distribution of the power equipment.

[0089] For example, when a phase voltage is applied to a bushing, an alternating electric field is generated in the bushing and its surrounding area, resulting in polarization losses. Although the insulating material has excellent insulation properties, it possesses a very low conductivity. Due to this conductivity, leakage current exists in the insulating medium, leading to conductivity losses. Therefore, dielectric losses are composed of both polarization losses and conductivity losses.

[0090] When determining the dielectric loss of the insulation part, the dielectric loss model of the insulation part is determined based on the electric field intensity distribution of the power equipment. The dielectric loss model of the insulation part is as follows:

[0091] ;

[0092] Where P is the dielectric loss of the insulating part, M is the number of the first discrete units, and V i Let f be the unit volume, f be the operating frequency of the bushing, and E be the electric field strength. For dielectric loss factor, is the relative permittivity.

[0093] Furthermore, the current electric field intensity of the insulating part is obtained, and the dielectric loss model of the insulating part is input to obtain the current dielectric loss of the insulating part.

[0094] Specifically, when calculating the dielectric loss of insulating materials, the dielectric loss factor for each material is... They are also different; the insulating parts in the bushing are oil-impregnated paper, transformer oil, and porcelain bushing, and their dielectric loss factors are shown in Table 2.

[0095] Table 2 Dielectric loss factor of bushing insulation medium

[0096]

[0097] COMSOL software calculated that the dielectric loss of the upper and lower porcelain bushings was 0.013W, the dielectric loss of the transformer oil was 0.11W, and the dielectric loss of the capacitor core was 3.19W.

[0098] S205: Establish a three-dimensional eddy current field analysis model for power equipment based on the conductive metal parts inside the bushings of power equipment under seismic conditions.

[0099] For example, since two-dimensional planar graphics are not suitable for calculating eddy current fields, eddy current field calculations can only be performed in a three-dimensional eddy current field analysis model. In the three-dimensional eddy current field analysis model, the physical field model that needs to be added is the magnetic field. Under magnetic field conditions, only relative permeability and resistivity will affect the magnetic field. Since there is no magnetically conductive material inside the 110kV oil-paper insulating bushing, the relative permeability of all materials inside the bushing and the surrounding air domain is assumed to be 1. When performing three-dimensional eddy current field simulation calculations, it is only necessary to establish a three-dimensional eddy current field analysis model for the metal conductive parts inside the oil-paper insulating bushing. The resistivity of the metal conductive parts inside the oil-paper insulating bushing is shown in Table 3.

[0100] Table 3 Resistivity of Conductive Metal Parts

[0101]

[0102] In the three-dimensional eddy current field simulation, the boundary condition is set as follows: the power frequency current flowing into the bushing is 630A.

[0103] S206: Divide the three-dimensional eddy current field analysis model into several second discrete units.

[0104] S207: Apply power frequency current to each second discrete unit and obtain the power frequency current density within each second discrete unit.

[0105] S208: Determine the Joule loss of the metal conductive part based on the density of the power frequency current in the second discrete unit.

[0106] For example, the Joule loss model for the metal part is determined based on the density of the power frequency current within the second discrete unit. The Joule loss model for the metal part is as follows:

[0107] ;

[0108] in, For Joule loss, Let be the density of the power frequency current within the second discrete unit. Let N be the volume of the second discrete unit, and N be the total number of discrete units.

[0109] The current power frequency current density is obtained and input into the Joule loss model of the metal parts to obtain the current Joule loss of the metal parts. Calculations show that the total loss in the conductor region is 34.38W, with the conductor rod exhibiting the largest Joule loss at 25.14W. The Joule losses in the upper and lower cable exit devices and the oil conservator are 9.04W and 0.31W respectively, while the oil conservator loss is 0.07W. It can be concluded that the Joule loss is greatest in the conductor rod region, exceeding that of the cable exit devices and the oil conservator. Because the top cable exit device is in direct contact with the conductor rod, this area experiences greater heat generation, while the oil conservator experiences less heat generation.

[0110] S209: Incorporate dielectric loss and Joule loss as heat sources into the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model.

[0111] For example, when calculating the temperature field of a 110kV oil-paper insulated bushing, it is necessary to use the solid heat transfer module in the COMSOL simulation software to consider the heat conduction effect between each material. The dielectric loss calculated in the electric field and the Joule loss calculated in the eddy current field are added as heat sources to the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model, and the heat transfer mode is set to heat transfer and heat convection, ignoring the influence of heat radiation.

[0112] S210: Under preset ambient temperature and preset oil temperature, simulate a two-dimensional axisymmetric temperature field model to determine the temperature field distribution of the power equipment.

[0113] For example, the ambient temperature is set to 20°C. Since the transformer oil temperature is generally no higher than 60°C above the ambient temperature, the oil temperature is set to 80°C. Natural convection heat transfer occurs on the outer surface of the bushing in contact with air; the transfer coefficient between the two is defined as 28 W / m²·K. Under the set ambient and oil temperatures, a two-dimensional axisymmetric temperature field model is simulated to determine the temperature field distribution of the power equipment.

[0114] S211: Determine the failure mode of the power equipment based on the comparison between the electric field intensity distribution and the voltage threshold, and the comparison between the temperature field distribution and the temperature threshold.

[0115] For example, when the electric field strength distribution of the power equipment reaches the voltage threshold, the failure mode of the power equipment is breakdown; when the temperature field distribution of the power equipment reaches the temperature threshold, the failure mode of the power equipment is aging of the insulation material.

[0116] As described above, this invention obtains the electric and temperature field distributions within electrical equipment after the displacement of electrical equipment components under earthquake conditions. Based on the electric and temperature field constraints of the equipment materials, it determines the damage state of the equipment under different earthquake conditions, thereby establishing failure modes of electrical equipment under different earthquake intensities and conducting electrical performance evaluation of the electrical equipment.

[0117] like Figure 3 As shown, Figure 3 This is a flowchart illustrating another embodiment of the simulation method for the electric and temperature fields of power equipment provided by the present invention. The simulation method for the electric and temperature fields of power equipment includes:

[0118] S301: Determine the failure mode of the power equipment based on the comparison between the electric field intensity distribution and the voltage threshold, and the comparison between the temperature field distribution and the temperature threshold.

[0119] S3011: When the electric field strength distribution of the power equipment reaches the voltage threshold, the failure mode of the power equipment is breakdown.

[0120] For example, equipment can fail in various ways under seismic loading. When electrical equipment components undergo relative displacement, and the internal electric field distribution reaches the voltage threshold (the breakdown voltage of the material), insulation failure will occur, leading to equipment breakdown.

[0121] S3012: When the temperature field distribution of the power equipment reaches the temperature threshold, the failure mode of the power equipment is the aging of the insulation material.

[0122] For example, when the internal temperature rise of electrical equipment exceeds the temperature threshold (the allowable temperature rise of the material), it will cause the insulation material to age, affecting its service life. Based on the material properties of different electrical equipment, the damage state of the equipment under seismic loading can be determined.

[0123] like Figure 4 As shown, Figure 4 A schematic diagram of an embodiment of a simulation system for the electric and temperature fields of power equipment provided by the present invention. A simulation system 10 for the electric and temperature fields of power equipment, the system comprising:

[0124] The electric field intensity distribution determination module 11 for power equipment is used to establish a two-dimensional axisymmetric simulation model of power equipment under seismic conditions, and to determine the electric field intensity distribution of power equipment based on the two-dimensional axisymmetric simulation model.

[0125] The dielectric loss determination module 12 for insulating parts is used to determine the dielectric loss of insulating parts based on the electric field strength distribution of the power equipment.

[0126] The Joule loss determination module 13 for conductive metal parts is used to establish a three-dimensional eddy current field analysis model of the conductive metal parts inside the bushing of the power equipment under seismic conditions, and to determine the Joule loss of the conductive metal parts based on the three-dimensional eddy current field analysis model.

[0127] The two-dimensional axisymmetric temperature field model determination module 14 is used to incorporate dielectric loss and Joule loss as heat sources into the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model.

[0128] The temperature field distribution determination module 15 for power equipment is used to simulate and determine the temperature field distribution of power equipment under preset ambient temperature and preset oil temperature by a two-dimensional axisymmetric temperature field model.

[0129] For example, in the dielectric loss model 11 of the insulation part, a two-dimensional axisymmetric simulation model of the power equipment under seismic conditions is established; the two-dimensional axisymmetric simulation model is divided into several first discrete units; a phase voltage is applied to each first discrete unit to determine the electric field intensity distribution of the power equipment. In the dielectric loss determination module 12 of the insulation part, the dielectric loss of the insulation part is determined according to the electric field intensity distribution of the power equipment. In the Joule loss model 13 of the metal conductive part, a three-dimensional eddy current field analysis model of the power equipment is established based on the metal conductive part inside the bushing of the power equipment under seismic conditions; the three-dimensional eddy current field analysis model is divided into several second discrete units; a power frequency current is applied to each second discrete unit to obtain the power frequency current density in each second discrete unit; the Joule loss of the metal conductive part is determined according to the power frequency current density in the second discrete unit. In the two-dimensional axisymmetric temperature field model determination module 14, dielectric loss and Joule loss are added as heat sources to the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model. In the temperature field distribution determination module 15 of the power equipment, the temperature field distribution of the power equipment is determined by simulating a two-dimensional axisymmetric temperature field model under preset ambient temperature and preset oil temperature.

[0130] like Figure 5 As shown, Figure 5 This is a schematic diagram of an embodiment of the device provided by the present invention. The device 20 includes a memory 21 and a processor 22. The memory 21 stores a computer program, and the processor 22 executes the computer program during operation to achieve, for example... Figure 1 , Figure 2 and Figure 3 The method shown.

[0131] The specific technical details of the simulation method for the electric field and temperature field of a power equipment implemented by the aforementioned device 20 when executing a computer program have been discussed in detail in the aforementioned method steps, and therefore will not be repeated here.

[0132] like Figure 6 As shown, Figure 6 This is a schematic diagram of the structure of an embodiment of the medium provided by the present invention. The medium 30 stores at least one computer program 31, which is executed by the processor 22 to perform the following... Figure 1 , Figure 2 and Figure 3 The method shown is detailed above and will not be repeated here. In one embodiment, the medium 30 can be a storage chip, hard disk, portable hard disk, USB flash drive, optical disk, or other read / write storage device, or even a server, etc.

[0133] The foregoing has described specific embodiments of this specification; other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than those shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily have to follow the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0134] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the embodiments of apparatus, devices, and non-volatile computer-readable storage media are basically similar to the method embodiments, so the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0135] The apparatus, device, non-volatile computer-readable storage medium and method provided in the embodiments of this specification are corresponding. Therefore, the apparatus, device and non-volatile computer storage medium also have similar beneficial technical effects as the corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the corresponding apparatus, device and non-volatile computer storage medium will not be repeated here.

[0136] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0137] For ease of description, the above apparatus is described by dividing it into various functional units. Of course, in implementing this specification, the functions of each unit can be implemented in one or more software and / or hardware components. Those skilled in the art will understand that the embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, the embodiments of this specification can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0138] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0139] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0140] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A simulation method for the electric field and temperature field of power equipment, characterized in that, The method includes: A two-dimensional axisymmetric simulation model of power equipment under seismic conditions is established, and the electric field intensity distribution of the power equipment is determined based on the two-dimensional axisymmetric simulation model. Specifically, establishing the two-dimensional axisymmetric simulation model of the power equipment and determining the electric field intensity distribution based on the two-dimensional axisymmetric simulation model includes: establishing the two-dimensional axisymmetric simulation model of the power equipment under seismic conditions; dividing the two-dimensional axisymmetric simulation model into several first discrete units; applying a phase voltage to each first discrete unit to determine the electric field intensity distribution of the power equipment. Determining the dielectric loss of the insulating part based on the electric field intensity distribution of the power equipment, specifically includes: determining a dielectric loss model for the insulating part based on the electric field intensity distribution of the power equipment, wherein the dielectric loss model for the insulating part is: Where P is the dielectric loss of the insulating part, M is the number of the first discrete elements, Vi is the element volume, f is the operating frequency of the bushing, and E is the electric field strength. For dielectric loss factor, The relative permittivity is used; the current electric field intensity of the insulating part is obtained, and the dielectric loss model of the insulating part is input to obtain the current dielectric loss of the insulating part; A three-dimensional eddy current field analysis model of the power equipment is established based on the internal metal conductive parts of the bushing under seismic conditions. The three-dimensional eddy current field analysis model is divided into several second discrete units. A power frequency current is applied to each second discrete unit, and the density of the power frequency current within each second discrete unit is obtained. The Joule loss of the metal conductive parts is determined based on the density of the power frequency current within the second discrete unit. Specifically, determining the Joule loss of the metal conductive parts based on the density of the power frequency current within the second discrete unit includes: determining a Joule loss model for the metal parts based on the density of the power frequency current within the second discrete unit. The Joule loss model for the metal parts is as follows: ;in, For Joule loss, Let be the density of the power frequency current within the second discrete unit. Let N be the volume of the second discrete unit and N be the total number of discrete units; obtain the density of the current power frequency current, input it into the Joule loss model of the metal part, and obtain the current Joule loss of the metal part; The dielectric loss and Joule loss are added as heat sources to the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model. The temperature field distribution of the power equipment is determined by simulating the two-dimensional axisymmetric temperature field model under preset ambient temperature and preset oil temperature.

2. The simulation method for electric field and temperature field of power equipment according to claim 1, characterized in that, After determining the temperature field distribution of the power equipment by simulating a two-dimensional axisymmetric temperature field model under preset ambient temperature and preset oil temperature, the method further includes: The failure mode of the power equipment is determined by comparing the electric field intensity distribution with the voltage threshold and the temperature field distribution with the temperature threshold.

3. The simulation method for electric and temperature fields of power equipment according to claim 2, characterized in that, The determination of the power equipment failure mode based on the comparison between the electric field intensity distribution and the voltage threshold, and the comparison between the temperature field distribution and the temperature threshold, specifically includes: When the electric field strength distribution of the power equipment reaches the voltage threshold, the failure mode of the power equipment is power equipment breakdown. When the temperature field distribution of the power equipment reaches the temperature threshold, the failure mode of the power equipment is aging of the insulation material.

4. A simulation system for the electric field and temperature field of power equipment, characterized in that, The system includes: The electric field intensity distribution determination module for power equipment is used to establish a two-dimensional axisymmetric simulation model of the power equipment under seismic conditions, and to determine the electric field intensity distribution of the power equipment based on the two-dimensional axisymmetric simulation model. Specifically, establishing the two-dimensional axisymmetric simulation model of the power equipment and determining the electric field intensity distribution based on the two-dimensional axisymmetric simulation model includes: establishing the two-dimensional axisymmetric simulation model of the power equipment under seismic conditions; dividing the two-dimensional axisymmetric simulation model into several first discrete units; applying a phase voltage to each first discrete unit to determine the electric field intensity distribution of the power equipment. The dielectric loss determination module for the insulation part is used to determine the dielectric loss of the insulation part based on the electric field intensity distribution of the power equipment. Specifically, determining the dielectric loss of the insulation part based on the electric field intensity distribution of the power equipment includes: determining a dielectric loss model for the insulation part based on the electric field intensity distribution of the power equipment. The dielectric loss model for the insulation part is as follows: Where P is the dielectric loss of the insulating part, M is the number of the first discrete elements, Vi is the element volume, f is the operating frequency of the bushing, and E is the electric field strength. For dielectric loss factor, The relative permittivity is used; the current electric field intensity of the insulating part is obtained, and the dielectric loss model of the insulating part is input to obtain the current dielectric loss of the insulating part; A module for determining Joule loss in conductive metal parts is used to establish a three-dimensional eddy current field analysis model of the power equipment based on the conductive metal parts inside the bushing of the power equipment under seismic conditions; divide the three-dimensional eddy current field analysis model into several second discrete units; apply a power frequency current to each second discrete unit and obtain the density of the power frequency current within each second discrete unit; determine the Joule loss of the conductive metal parts based on the density of the power frequency current within the second discrete unit. Specifically, determining the Joule loss of the conductive metal parts based on the density of the power frequency current within the second discrete unit includes: determining a Joule loss model for the metal parts based on the density of the power frequency current within the second discrete unit. The Joule loss model for the metal parts is as follows: ;in, For Joule loss, Let be the density of the power frequency current within the second discrete unit. Let N be the volume of the second discrete unit and N be the total number of discrete units; obtain the density of the current power frequency current, input it into the Joule loss model of the metal part, and obtain the current Joule loss of the metal part; The two-dimensional axisymmetric temperature field model determination module is used to add the dielectric loss and Joule loss as heat sources to the two-dimensional axisymmetric simulation model to determine the two-dimensional axisymmetric temperature field model. The module for determining the temperature field distribution of power equipment is used to simulate and determine the temperature field distribution of power equipment under preset ambient temperature and preset oil temperature using a two-dimensional axisymmetric temperature field model.

5. A computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform the steps of the method as claimed in any one of claims 1 to 3.

6. A computer device comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of the method as claimed in any one of claims 1 to 3.

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