Simulation method and system for electric field and temperature field of power equipment, medium and equipment

Abstract

The embodiment of the invention discloses a simulation method and system for an electric field and a temperature field of power equipment, a medium and equipment, and the method comprises the steps: building a two-dimensional axial symmetry simulation model of the power equipment under an earthquake condition, and determining the electric field intensity distribution of the power equipment according to the two-dimensional axial symmetry simulation model; determining the dielectric loss of the insulation part according to the electric field intensity distribution of the power equipment; establishing a three-dimensional eddy current field analysis model of the power equipment for the metal conductive part of the power equipment under the seismic condition, and determining Joule loss of the metal conductive part according to the three-dimensional eddy current field analysis model; adding the dielectric loss and the Joule loss as heat sources into the two-dimensional axisymmetric simulation model, and determining a two-dimensional axisymmetric temperature field model; and at a preset environment temperature and a preset oil temperature, simulating the two-dimensional axisymmetric temperature field model to determine the temperature field distribution of the electrical equipment, and determining the damage states of the electrical equipment under different earthquake conditions by obtaining the electric field and temperature field distribution in the electrical equipment under the earthquake conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment analysis, and in particular to a method, system, medium and equipment for simulating electric field and temperature field of power equipment. Background Art

[0002] As a natural disaster, earthquakes can cause severe physical damage to power equipment with strong vibrations and ground motions, which in turn affects its electrical performance and safe operation. Therefore, evaluating the failure mode and damage state of power equipment under earthquake conditions is crucial to ensuring the stability and safety of the power system. At the same time, with the continuous development of the power system, higher requirements are placed on the electrical performance evaluation of power equipment. Especially under extreme conditions such as earthquakes, how to accurately evaluate the damage state and electrical performance of power equipment has become a technical problem that needs to be solved urgently.

[0003] In the prior art, although there are some analysis and evaluation methods for power equipment under earthquake action, most of them are based on simplified models and assumptions, which make it difficult to accurately reflect the complex response of power equipment under real earthquake conditions and to quickly identify the equipment status of power equipment. 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 method for simulating electric field and temperature field of electric equipment, the method comprising:

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

[0007] The dielectric loss of the insulating part is determined according to the electric field strength distribution of the electric power equipment.

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

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

[0010] Under a preset ambient temperature and a preset oil temperature, the two-dimensional axisymmetric temperature field model is simulated to determine the temperature field distribution of the electric equipment.

[0011] The step of establishing a two-dimensional axisymmetric simulation model of the power equipment and determining the electric field intensity distribution of the power equipment according to the two-dimensional axisymmetric simulation model specifically includes:

[0012] Establish a two-dimensional axisymmetric simulation model of power equipment under earthquake conditions.

[0013] The two-dimensional axisymmetric simulation model is divided into a plurality of 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] Wherein, determining the dielectric loss of the insulating part according to the electric field strength distribution of the power equipment specifically includes:

[0016] The dielectric loss model of the insulating part is determined according to the electric field strength distribution of the power equipment, and the dielectric loss model of the insulating part is:

[0017]

[0018] Where P is the dielectric loss of the insulating part, M is the number of the first discrete units, V i is the unit volume, f is the operating frequency of the bushing, E is the electric field intensity, tanδ is the dielectric loss factor, ε r is the relative dielectric constant.

[0019] The current electric field strength 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.

[0020] The step of establishing a three-dimensional eddy current field analysis model of the electric equipment for the metal conductive part inside the bushing of the electric equipment and determining the Joule loss of the metal conductive part according to the three-dimensional eddy current field analysis model specifically includes:

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

[0022] The three-dimensional eddy current field analysis model is divided into a plurality of second discrete units.

[0023] Applying a power frequency current to each of the second discrete units, and obtaining a density of the power frequency current in each of the second discrete units.

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

[0025] The determining of the Joule loss of the metal conductive part according to the density of the power frequency current in the second discrete unit specifically includes:

[0026] The Joule loss model of the metal part is determined according to the density of the power frequency current in the second discrete unit. The Joule loss model of the metal part is:

[0027]

[0028] Where P′ is the Joule loss, J i is the density of the power frequency current in the second discrete unit, V i is the volume of the second discrete unit, and N is the total number of discrete units.

[0029] The density of the current power frequency current is obtained, and the Joule loss model of the metal part is input to obtain the current Joule loss of the metal part.

[0030] Wherein, after simulating the two-dimensional axisymmetric temperature field model to determine the temperature field distribution of the power equipment under the preset ambient temperature and the preset oil temperature, the method further includes:

[0031] The failure mode of the electric device is determined based on the comparison between the electric field intensity distribution of the electric device and the voltage threshold, and the comparison between the temperature field distribution of the electric device and the temperature threshold.

[0032] The determining of the failure mode of the electric device according to the comparison between the electric field strength distribution of the electric device and the voltage threshold, and the comparison between the temperature field distribution of the electric device and the temperature threshold, specifically includes:

[0033] When it is determined that the electric field intensity distribution of the electric device reaches a voltage threshold, the failure mode of the electric device is that the electric device is broken down.

[0034] When it is determined that the temperature field distribution of the electric equipment reaches a temperature threshold, the failure mode of the electric equipment is aging of the insulation material.

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

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

[0037] The dielectric loss determination module of the insulating part is used to determine the dielectric loss of the insulating part according to the electric field strength distribution of the power equipment.

[0038] The Joule loss determination module for metal conductive parts is used to establish a three-dimensional eddy current field analysis model of the power equipment for the metal conductive parts inside the casing of the power equipment under seismic conditions, and determine the Joule loss of the metal conductive 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 temperature field distribution determination module of the electric equipment is used to simulate the two-dimensional axisymmetric temperature field model under the preset ambient temperature and the preset oil temperature to determine the temperature field distribution of the electric equipment.

[0041] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the method described above.

[0042] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

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

[0044] The present invention first establishes a two-dimensional axisymmetric simulation model of power equipment under earthquake conditions. The two-dimensional axisymmetric simulation model can fully consider the axisymmetric characteristics of the power equipment, thereby more accurately reflecting the electric field distribution of the insulating parts under earthquake conditions, and then determining the dielectric loss. A three-dimensional eddy current field analysis model is established for the metal conductive parts of the power equipment under earthquake conditions. The three-dimensional eddy current field analysis model comprehensively reflects the eddy current distribution of the metal conductive parts of the power equipment under earthquake conditions, and then accurately calculates the Joule loss.

[0045] Furthermore, 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, which can realize the coupled analysis of multi-physical fields (electric field, magnetic field, temperature field) of power equipment and more accurately reflect the actual operating status of power equipment. The two-dimensional axisymmetric temperature field model is simulated at the preset ambient temperature and oil temperature to obtain the temperature field distribution of the power equipment.

[0046] In summary, the present invention can determine the damage state of the power equipment under different earthquake conditions by obtaining the electric field and temperature field distribution inside the electrical equipment after the power equipment components are displaced under earthquake conditions, thereby establishing the failure mode of the power equipment under different earthquake intensities and evaluating the electrical performance of the power equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] in:

[0049] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for simulating electric field and temperature field of electric equipment provided by the present invention;

[0050] Figure 2 A schematic flow chart of another embodiment of a method for simulating electric field and temperature field of electric equipment provided by the present invention;

[0051] Figure 3 A schematic flow chart of another embodiment of a method for simulating electric field and temperature field of electric equipment provided by the present invention;

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

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

[0054] Figure 6 A schematic structural diagram of an embodiment of the medium provided by the present invention. DETAILED DESCRIPTION

[0055] 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.

[0056] like Figure 1 As shown, Figure 1 A flow chart of an embodiment of a method for simulating electric field and temperature field of an electric device provided by the present invention. A method for simulating electric field and temperature field of an electric device, the method comprising:

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

[0058] Exemplarily, a two-dimensional axisymmetric simulation model of power equipment under earthquake conditions is established; taking 110kV oil-immersed bushing as an example of power equipment, COMSOL software is used to establish a two-dimensional axisymmetric simulation model of the oil-immersed bushing, 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 a number of first discrete units. Phase voltage, i.e., boundary conditions, is applied to each first discrete unit to determine the electric field intensity distribution of the oil-immersed bushing.

[0060] S102: Determine the dielectric loss of the insulating part according to the electric field strength distribution of the power equipment.

[0061] Furthermore, the dielectric loss of the insulating part is determined according to the electric field strength distribution of the power equipment. When determining the dielectric loss of the insulating part, the dielectric loss model of the insulating part is determined according to the electric field strength distribution of the power equipment. The dielectric loss model of the insulating part is:

[0062]

[0063] Where P is the dielectric loss of the insulating part, M is the number of the first discrete units, V i is the unit volume, f is the operating frequency of the bushing, E is the electric field intensity, tanδ is the dielectric loss factor, ε r is the relative dielectric constant.

[0064] The current electric field strength 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.

[0065] S103: establishing a three-dimensional eddy current field analysis model of the power equipment for the metal conductive parts of the power equipment under earthquake conditions, and determining the Joule loss of the metal conductive parts according to the three-dimensional eddy current field analysis model.

[0066] Exemplarily, a three-dimensional eddy current field analysis model of the power equipment is established based on the metal conductive parts inside the casing of the power equipment under earthquake conditions. Specifically, since two-dimensional plane graphics are not suitable for calculating eddy current fields, eddy current field calculations can only be performed in three-dimensional eddy current field analysis models. 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 magnetic 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 metal conductive parts of the power equipment, and set the power frequency current and boundary conditions.

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

[0068] Furthermore, the Joule loss model of the metal part is determined according to the density of the power frequency current in the second discrete unit. The Joule loss model of the metal part is:

[0069]

[0070] Where P′ is the Joule loss, J i is the density of the power frequency current in the second discrete unit, V i is the volume of the second discrete unit, and N is the total number of discrete units;

[0071] The density of the current power frequency current is obtained, and the Joule loss model of the metal part is input to obtain the current Joule loss of the metal part.

[0072] S104: Adding 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, the two-dimensional axisymmetric temperature field model is determined, and the heat transfer mode is set to heat transfer and heat convection, ignoring the influence of thermal radiation.

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

[0075] Exemplarily, under preset ambient temperature and oil temperature, a two-dimensional axisymmetric temperature field model is simulated to determine the temperature field distribution of the power equipment under earthquake conditions.

[0076] From the above description, it can be seen that the present invention first establishes a two-dimensional axisymmetric simulation model of the power equipment under earthquake conditions. The two-dimensional axisymmetric simulation model can fully consider the axisymmetric characteristics of the power equipment, thereby more accurately reflecting the electric field distribution of the insulating parts under earthquake conditions, and then determining the dielectric loss. And a three-dimensional eddy current field analysis model is established for the metal conductive parts of the power equipment under earthquake conditions. The three-dimensional eddy current field analysis model comprehensively reflects the eddy current distribution of the metal conductive parts of the power equipment under earthquake conditions, and then accurately calculates the Joule loss.

[0077] Furthermore, 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, which can realize the coupled analysis of multi-physical fields (electric field, magnetic field, temperature field) of power equipment and more accurately reflect the actual operating status of power equipment. The two-dimensional axisymmetric temperature field model is simulated at the preset ambient temperature and oil temperature to obtain the temperature field distribution of the power equipment.

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

[0079] like Figure 2 As shown, Figure 2A flow chart of another embodiment of a method for simulating electric field and temperature field of an electric device provided by the present invention. A method for simulating electric field and temperature field of an electric device, the method comprising:

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

[0081] Exemplarily, the power equipment takes 110kV oil-immersed bushing as an example, and uses COMSOL software to establish a two-dimensional axisymmetric simulation model of the oil-immersed bushing under earthquake conditions, and applies boundary conditions. Specifically, since the bushing is strictly symmetrical with the conductive rod as the center, for the convenience of calculation, the 1 / 2 bushing structure is selected to establish a two-dimensional axisymmetric simulation model. In order to restore the actual operating state of the bushing and make the calculation results accurate, the air domain and the oil tank can be set as rectangles, in which the radial length is twice the outer diameter of the bushing, the sum of the length of the oil pillow 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 plate in the model is simplified to 13 layers. At the same time, the boundary conditions are set as follows: the conductive rod, the top outlet device and the bottom outlet device are applied with a phase voltage of 63kV; the oil tank, the flange, the outermost plate and the air boundary outside the bushing are applied with a 0 potential; the plate inside the capacitor core is set to a floating potential.

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

[0083] S203: Applying a 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 the COMSOL software is an electric field, and the two-dimensional axisymmetric simulation model of the oil-immersed casing is divided into a number of first discrete units, and boundary conditions are applied to each first discrete unit to determine the electric field intensity distribution of the oil-immersed casing. When simulating under electric field conditions, the distribution of the casing electric field is related to the relative dielectric constant of the material inside the casing. The relative dielectric constants of various materials in the casing model are shown in Table 1:

[0085] Table 1 Relative dielectric constants of various materials in the casing

[0086]

[0087] The potential and electric field strength distribution of the bushing are obtained through simulation. From the potential distribution, it can be seen that under the action of the aluminum foil plate in the capacitor core, the potential distribution of the capacitor core and the flange is relatively uniform, but the potential at both ends of the flange changes sharply. From the distribution of the electric field strength, it can be seen that the electric field of the bushing is very low inside the bushing and is distributed very evenly. Only the electric field strength at the flange is high, and the maximum value of the electric field strength at the flange is 77.2kV / m. From the above electric field strength analysis results, it can be seen that the electric field strength in the bushing is evenly distributed, and the electric field strength value on the porcelain bushing is also below the breakdown field strength of the air, so the safe operation of the bushing is guaranteed during the long-term operation of the bushing.

[0088] S204: Determine the dielectric loss of the insulating part according to the electric field strength distribution of the power equipment.

[0089] For example, when a phase voltage is applied to the bushing, an alternating electric field will be generated in the bushing and the external area, and polarization loss will be generated under the action of the alternating electric field. Although the insulation performance of the insulating material is very good, there will be a very small conductivity in the insulating material. Due to the conductivity, there will be leakage current in the insulating medium, and the leakage current will cause conductivity loss in the insulating medium. Therefore, the dielectric loss is composed of polarization loss and conductivity loss.

[0090] When determining the dielectric loss of the insulating part, the dielectric loss model of the insulating part is determined according to the electric field strength distribution of the power equipment. The dielectric loss model of the insulating part is:

[0091]

[0092] Where P is the dielectric loss of the insulating part, M is the number of the first discrete units, V i is the unit volume, f is the operating frequency of the bushing, E is the electric field intensity, tanδ is the dielectric loss factor, ε r is the relative dielectric constant.

[0093] Furthermore, the current electric field strength 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 tanδ of each material is 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 Dissipation factor of bushing insulation medium

[0096] Material Oil-impregnated paper Transformer oil Porcelain bushing Dissipation Factor 0.0038 0.005 0.0003

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

[0098] S205: Establish a three-dimensional eddy current field analysis model of the power equipment according to the metal conductive parts inside the bushing of the power equipment under earthquake conditions.

[0099] For example, since two-dimensional plane graphics are not suitable for calculating eddy current fields, eddy current field calculations can only be performed in three-dimensional eddy current field analysis models. 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 magnetic permeability and resistivity will affect the magnetic field. Since there is no magnetic conductive material in the internal structure of the 110kV oil-paper insulation bushing, the relative magnetic permeability of all materials inside the bushing and the outer 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 insulation bushing. The resistivity of the metal conductive parts inside the oil-paper insulation bushing is shown in Table 3.

[0100] Table 3 Resistivity of metal conductive parts

[0101] Material brass Carbon Steel Location Guide rod Oil pillow, flange outlet device Resistivityρ / μΩ·m 0.064 0.0446

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

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

[0104] S207: Applying power frequency current to each second discrete unit to obtain the density of the power frequency current in each second discrete unit.

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

[0106] Exemplarily, the Joule loss model of the metal part is determined according to the density of the power frequency current in the second discrete unit, and the Joule loss model of the metal part is:

[0107]

[0108] Where P′ is the Joule loss, J i is the density of the power frequency current in the second discrete unit, V i is the volume of the second discrete unit, and N is the total number of discrete units;

[0109] Get the density of the current power frequency current, input the Joule loss model of the metal part, and get the current Joule loss of the metal part. Calculation shows that the total loss in the conductor area is 34.38W, of which the maximum Joule loss of the conductive rod is 25.14W, the Joule loss of the upper and lower outlet devices and the oil pillow are 9.04 and 0.31W respectively, and the oil pillow loss is 0.07W. It can be concluded that the Joule loss in the conductive rod area is the largest, which is greater than the Joule loss of the inlet and outlet devices and the oil pillow. Since the top outlet device is in direct contact with the guide rod, this part heats up more, but the oil pillow heats up less.

[0110] S209: Adding 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, the two-dimensional axisymmetric temperature field model is determined, and the heat transfer mode is set to heat transfer and heat convection, ignoring the influence of thermal radiation.

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

[0113] For example, the ambient temperature is set to 20°C. Since the transformer oil temperature is generally not higher than the ambient temperature of 60°C, the oil temperature is set to 80°C. There is natural convection heat transfer between the outer surface of the bushing and the air, and the commutation coefficient between the two is defined as 28W / m2·K. Under the set ambient temperature and oil temperature, the 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 according to the comparison between the electric field intensity distribution of the power equipment and the voltage threshold, and the comparison between the temperature field distribution of the power equipment and the temperature threshold.

[0115] Exemplarily, when it is determined that the electric field strength distribution of the power equipment reaches a voltage threshold, the failure mode of the power equipment is breakdown of the power equipment; when it is determined that the temperature field distribution of the power equipment reaches a temperature threshold, the failure mode of the power equipment is aging of the insulation material.

[0116] From the above description, it can be seen that the present invention obtains the distribution of electric field and temperature field in electrical equipment after the displacement of electrical equipment components under seismic conditions, and can determine the damage state of the equipment under different seismic conditions according to the electric field and temperature field limitations of the equipment material, thereby establishing the failure mode of the power equipment under different earthquake intensities and evaluating the electrical performance of the power equipment.

[0117] like Figure 3 As shown, Figure 3 A flow chart of another embodiment of a method for simulating electric field and temperature field of an electric device provided by the present invention. A method for simulating electric field and temperature field of an electric device, the method comprising:

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

[0119] S3011: When it is determined that the electric field intensity distribution of the power equipment reaches a voltage threshold, the failure mode of the power equipment is that the power equipment is broken down.

[0120] For example, there are many types of failures in equipment under earthquakes. After relative displacement of electrical equipment components, when the electric field distribution inside the electrical equipment reaches the voltage threshold (the breakdown voltage of the material), the insulation will fail, and the electrical equipment will be broken down.

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

[0122] For example, when the temperature rise inside the power equipment exceeds the temperature threshold (the allowable temperature rise of the material), the insulation material will age and the service life of the insulation material will be affected. According to the material properties of different power equipment, the damage state of the equipment under the action of an earthquake can be determined.

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

[0124] The electric field intensity distribution determination module 11 of the electric equipment is used to establish a two-dimensional axisymmetric simulation model of the electric equipment under earthquake conditions, and determine the electric field intensity distribution of the electric equipment according to the two-dimensional axisymmetric simulation model;

[0125] The dielectric loss determination module 12 of the insulating part is used to determine the dielectric loss of the insulating part according to the electric field strength distribution of the power equipment.

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

[0127] The two-dimensional axisymmetric temperature field model determination module 14 is used to add 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 of the power equipment is used to simulate the two-dimensional axisymmetric temperature field model under a preset ambient temperature and a preset oil temperature to determine the temperature field distribution of the power equipment.

[0129] Exemplarily, in the dielectric loss model 11 of the insulating part, a two-dimensional axisymmetric simulation model of the power equipment under earthquake conditions is established; the two-dimensional axisymmetric simulation model is divided into a number of first discrete units; a phase voltage is applied to each first discrete unit to determine the electric field strength distribution of the power equipment. In the dielectric loss determination module 12 of the insulating part, the dielectric loss of the insulating part is determined according to the electric field strength 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 according to the metal conductive part inside the bushing of the power equipment under earthquake conditions; the three-dimensional eddy current field analysis model is divided into a number of second discrete units; an industrial frequency current is applied to each second discrete unit to obtain the density of the industrial frequency current in each second discrete unit; the Joule loss of the metal conductive part is determined according to the density of the industrial frequency current in the second discrete unit. In the two-dimensional axisymmetric temperature field model determination module 14, 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. In the temperature field distribution determination module 15 of the electric power equipment, the two-dimensional axisymmetric temperature field model is simulated under the preset ambient temperature and the preset oil temperature to determine the temperature field distribution of the electric power equipment.

[0130] like Figure 5 As shown, Figure 5 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 when working to implement the following. Figure 1 , Figure 2 and Figure 3 The method shown.

[0131] The specific technical details of a method for simulating the electric field and temperature field of an electric device implemented when the above-mentioned device 20 executes a computer program have been discussed in detail in the aforementioned method steps, so they will not be repeated here.

[0132] like Figure 6 As shown, Figure 6 The structure diagram of an embodiment of the medium provided by the present invention is shown in FIG. The medium 30 stores at least one computer program 31, and the computer program 31 is executed by the processor 22 to implement the following Figure 1 , Figure 2 and Figure 3 In one embodiment, the medium 30 may be a storage chip, a hard disk, a mobile hard disk, a USB flash drive, an optical disk, or other readable and writable storage tools, or a server, etc.

[0133] The above describes specific embodiments of the present specification, and other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily have to be performed in the specific order or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0134] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer-readable storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0135] The apparatus, device, non-volatile computer-readable storage medium and method provided in the embodiments of this specification correspond to each other, and therefore, the apparatus, device, and non-volatile computer storage medium also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods 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 may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0137] For the convenience of description, the above device is described by being divided into various units according to their functions and described separately. Of course, when implementing this specification, the functions of each unit can be implemented in one or more software and / or hardware. It should be understood by those skilled in the art that this specification embodiment can be provided as a method, system, or computer program product. Therefore, this specification embodiment can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification embodiment can adopt the form of a computer program product 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 include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules 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 technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0139] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0140] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for simulating electric field and temperature field of power equipment, characterized in that: The method comprises: Establishing a two-dimensional axisymmetric simulation model of the power equipment under earthquake conditions, and determining the electric field intensity distribution of the power equipment according to the two-dimensional axisymmetric simulation model; Determining dielectric loss at an insulating portion according to the electric field strength distribution of the electric power equipment; Establishing a three-dimensional eddy current field analysis model of the power equipment for the metal conductive parts of the power equipment under earthquake conditions, and determining the Joule loss of the metal conductive parts according to the three-dimensional eddy current field analysis model; Adding the dielectric loss and Joule loss as heat sources into the two-dimensional axisymmetric simulation model to determine a two-dimensional axisymmetric temperature field model; Under a preset ambient temperature and a preset oil temperature, the two-dimensional axisymmetric temperature field model is simulated to determine the temperature field distribution of the electric equipment.

2. A method for simulating electric field and temperature field of electric power equipment according to claim 1, characterized in that: The step of establishing a two-dimensional axisymmetric simulation model of the electric equipment and determining the electric field intensity distribution of the electric equipment according to the two-dimensional axisymmetric simulation model specifically includes: Establish a two-dimensional axisymmetric simulation model of power equipment under earthquake conditions; Dividing the two-dimensional axisymmetric simulation model into a plurality of first discrete units; A phase voltage is applied to each of the first discrete units to determine the electric field intensity distribution of the power equipment.

3. A method for simulating electric field and temperature field of electric power equipment according to claim 2, characterized in that: Determining the dielectric loss of the insulating part according to the electric field strength distribution of the power equipment specifically includes: The dielectric loss model of the insulating part is determined according to the electric field strength distribution of the power equipment, and the dielectric loss model of the insulating part is: Where P is the dielectric loss of the insulating part, M is the number of the first discrete units, V i is the unit volume, f is the operating frequency of the bushing, E is the electric field intensity, tanδ is the dielectric loss factor, ε r is the relative dielectric constant; The current electric field strength 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.

4. The method for simulating electric field and temperature field of electric equipment according to claim 1, characterized in that: The method of establishing a three-dimensional eddy current field analysis model of the electric equipment for the metal conductive part inside the bushing of the electric equipment and determining the Joule loss of the metal conductive part according to the three-dimensional eddy current field analysis model specifically includes: A three-dimensional eddy current field analysis model of power equipment is established based on the metal conductive parts inside the casing of power equipment under earthquake conditions; Dividing the three-dimensional eddy current field analysis model into a plurality of second discrete units; Applying a power frequency current to each of the second discrete units to obtain a density of the power frequency current in each of the second discrete units; The Joule loss of the metal conductive part is determined according to the density of the power frequency current in the second discrete unit.

5. A method for simulating electric field and temperature field of electric power equipment according to claim 4, characterized in that: The determining of the Joule loss of the metal conductive part according to the density of the power frequency current in the second discrete unit specifically includes: The Joule loss model of the metal part is determined according to the density of the power frequency current in the second discrete unit. The Joule loss model of the metal part is: Where P′ is the Joule loss, J i is the density of the power frequency current in the second discrete unit, V i is the volume of the second discrete unit, and N is the total number of discrete units; The density of the current power frequency current is obtained, and the Joule loss model of the metal part is input to obtain the current Joule loss of the metal part.

6. The method for simulating electric field and temperature field of electric equipment according to claim 1, characterized in that: After simulating the two-dimensional axisymmetric temperature field model to determine the temperature field distribution of the power equipment under the preset ambient temperature and the preset oil temperature, the method further includes: The failure mode of the electric device is determined based on the comparison between the electric field intensity distribution of the electric device and the voltage threshold, and the comparison between the temperature field distribution of the electric device and the temperature threshold.

7. A method for simulating electric field and temperature field of electric power equipment according to claim 6, characterized in that: The determining of the failure mode of the electric device according to the comparison between the electric field intensity distribution of the electric device and the voltage threshold, and the comparison between the temperature field distribution of the electric device and the temperature threshold, specifically includes: When it is determined that the electric field intensity distribution of the electric device reaches a voltage threshold, the failure mode of the electric device is that the electric device is broken down; When it is determined that the temperature field distribution of the electric equipment reaches a temperature threshold, the failure mode of the electric equipment is aging of the insulation material.

8. A simulation system for electric field and temperature field of power equipment, characterized in that: The system comprises: The electric field strength distribution determination module of the power equipment is used to establish a two-dimensional axisymmetric simulation model of the power equipment under earthquake conditions, and determine the electric field strength distribution of the power equipment according to the two-dimensional axisymmetric simulation model; A dielectric loss determination module for an insulating part, used to determine the dielectric loss of the insulating part according to the electric field strength distribution of the electric power equipment; The Joule loss determination module of the metal conductive part is used to establish a three-dimensional eddy current field analysis model of the power equipment for the metal conductive part inside the bushing of the power equipment under earthquake conditions, and determine the Joule loss of the metal conductive part according to the three-dimensional eddy current field analysis model; A two-dimensional axisymmetric temperature field model determination module, 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; The temperature field distribution determination module of the electric equipment is used to simulate the two-dimensional axisymmetric temperature field model under the preset ambient temperature and the preset oil temperature to determine the temperature field distribution of the electric equipment.

9. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 7.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 7.

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