Electric field intensity accurate calculation method and system for converter transformer valve side sleeve

Abstract

The invention belongs to the technical field of high-voltage power transmission equipment, and particularly relates to an electric field intensity accurate calculation method and system for a converter transformer valve side bushing. An electrothermal coupling simulation model used for calculating the internal electric field distribution of the valve side sleeve is provided, verification shows that the calculation method result can accurately calculate the internal electric field intensity of the valve side sleeve, and the problem that a traditional electric field calculation method is insufficient in precision is effectively relieved. The method provides theoretical and technical support for electric field intensity optimization of the converter transformer valve side sleeve and reliable design of an insulation system.

Description

Technical Field

[0001] This invention belongs to the technical field of high-voltage power transmission equipment, specifically relating to a method and system for simulating and calculating the electric field strength of the bushing on the valve side of a converter transformer and optimizing the insulation structure design, and in particular, a method and system for accurately calculating the electric field strength of the bushing on the valve side of a converter transformer. Background Technology

[0002] In ultra-high voltage direct current (UHVDC) and AC / DC hybrid power transmission systems, the valve-side bushings of converter transformers are subjected to high voltage, high current, frequent voltage changes, and complex thermal load environments. High temperature, high field, and high frequency conditions can easily cause the dielectric properties of polymer insulation materials, such as conductivity and dielectric constant, to exhibit significant nonlinear characteristics. This leads to uneven temperature and electric field distribution inside the bushing, making it prone to partial discharge faults and even reducing insulation life.

[0003] Currently, several common methods have been developed for calculating the electric field strength of the valve-side bushing of converter transformers.

[0004] First, analytical calculation methods, such as the coaxial capacitor model and the resistance-capacitance equivalent model, are often used to handle static electric fields or DC current-carrying fields. These methods typically simplify the calculation process of the electric field, are suitable for relatively simple electric field distribution scenarios, and can quickly obtain approximate solutions for the electric field strength, but they cannot consider the dynamic changes of material parameters with the operating conditions.

[0005] Secondly, numerical simulation-based calculation methods, such as the finite element method (FEM) and the boundary element method (BEM), have been widely used in electric field strength calculations. These methods can perform three-dimensional modeling of the geometry, insulation material, and shielding layer of the valve-side bushing, accurately calculating the potential distribution and electric field strength distribution. However, these methods suffer from simplification, treating the conductivity and dielectric constant of the insulation material as constant values, or only considering their dependence on temperature.

[0006] Finally, recent research has further incorporated electro-thermal coupling effects and polarity reversal processes into electric field calculations, dynamically simulating changes in the electric field by considering factors such as temperature gradients and the heating effect of current-carrying conductors. These methods can more accurately predict the electric field distribution under complex operating conditions and have a certain degree of computational accuracy. However, even with these advanced methods, the material parameter models used in coupled simulations are still overly simplified, failing to simultaneously and systematically consider the nonlinear influence of the electric field intensity itself on conductivity, as well as the dependence of frequency on the dielectric constant.

[0007] Under complex actual operating conditions, the dielectric properties, such as conductivity, of the polymer insulation material inside the converter transformer valve-side bushing exhibit significant temperature- and field-strength-dependent nonlinear characteristics, leading to dynamic changes in the electric field distribution inside the bushing. Because existing methods fail to adequately reflect the nonlinear dielectric behavior of the polymer insulation material under real operating conditions, their calculations of the electric field distribution inside the converter transformer valve-side bushing show significant deviations. This deviation is particularly pronounced in high-temperature, high-field-strength regions.

[0008] Therefore, there is an urgent need in this field for a method that can more accurately and realistically reflect the nonlinear characteristics of insulating materials and accurately calculate the electric field strength inside the bushing of the converter transformer valve side, so as to ensure the safety of the power system. Summary of the Invention

[0009] In view of this, the present invention provides an accurate calculation method for the electric field strength of the converter transformer valve side bushing based on the nonlinear characteristics of the conductivity and dielectric constant of polymer insulating materials. By establishing the nonlinear relationship equation between the conductivity and dielectric constant of polymer insulating materials, an electrothermal coupling simulation model for calculating the electric field distribution inside the valve side bushing is proposed, which can better fit the actual operating conditions of the valve side bushing.

[0010] To achieve the above objectives, the present invention provides the following technical solution: A method for accurately calculating the electric field strength of the bushing on the side of a converter transformer valve includes the following steps: Step 1: Determine the nonlinear parameters of the polymer insulation material Select the type of polymer insulation material used for the converter transformer side bushing, and then test it at different temperatures. Different electric field strengths and different frequencies The material was measured to obtain data on the changes in its electrical conductivity and dielectric constant. These data were then used to establish a temperature-electric field dependent model for the conductivity of the polymer insulating material. Temperature-frequency dependent model of dielectric constant .

[0011]

[0012] in, For insulating materials at temperature and electric field strength Conductivity under the condition (unit: ) ; Reference temperature and the reference conductivity under zero electric field condition (unit: ; This is the temperature influence coefficient; Electric field influence coefficient (unit: ( ; The current temperature of the insulating material (unit: °C); For reference temperature; Electric field strength (unit: ; The power exponent of the effect of the electric field;

[0013] in, For insulating materials at temperature ,frequency Relative permittivity under the given conditions; Reference temperature Reference frequency The reference relative permittivity; The linear coefficient of the dielectric constant with respect to temperature change; This is the logarithmic coefficient of the frequency change with respect to the dielectric constant; The voltage excitation frequency (unit: Hz); The reference frequency is 50 Hz (power frequency).

[0014] Furthermore, the polymer insulating material type can be resin-impregnated paper (RIP) or epoxy-paper-epoxy composite material.

[0015] Furthermore, parameters are obtained through experimental measurement or fitting. , , , , , , .

[0016] Step 2: Establish a simulation model of the electrothermal coupling of the converter transformer valve side bushing. Based on the structural geometry and boundary conditions of the valve-side bushing, a three-dimensional finite element model was established using finite element analysis software, including the three-dimensional finite element models of each component of the bushing. The insulation material parameters corresponding to step one were substituted into the model, and the temperature field control equation was established using the electrothermal coupling principle.

[0017]

[0018] Establish the governing equations for electric field intensity under different operating conditions.

[0019] Assuming the influence of space charge is neglected, taking the steady-state electric field as an example, the governing equation for the electric field strength is established as follows:

[0020] in, Density of insulating material (unit: kg) m -3 ); Specific heat capacity of insulating materials (unit: J) kg -1 K -1 ); For temperature field; Time (unit: seconds); Let be the thermal conductivity of the material, denoted as a function of temperature, and obtained experimentally (unit: W). m -1 K -1 ); For the term "electric heat source," it represents the heat generation power density of the insulating material under the influence of an electric field (unit: W). m -3 ); It is the vacuum permittivity; The electric potential gradient is the electric field intensity vector. .

[0021] Furthermore, the finite element analysis software can be COMSOL or ANSYS.

[0022] Furthermore, the components of the bushing include an insulating layer, a conductor rod, a capacitor screen, and a flange connection.

[0023] Furthermore, the insulating material parameter is electrical conductivity. Dielectric constant Thermal conductivity k(T), specific heat capacity Density ρ, etc.

[0024] Step 3: Solve the model to calculate the electric field intensity distribution Using the model established in step two, boundary excitation conditions corresponding to the actual working conditions are applied, and simulations are performed for each working condition to obtain the temperature distribution T(x) and electric field intensity distribution E(x) in the position domain, and the maximum electric field intensity is extracted. Analyze the weak electric field region in the valve-side bushing. Record the model's values ​​under the corresponding temperature, frequency, and electric field conditions. value.

[0025]

[0026] in, In the region ,temperature ,frequency Maximum electric field intensity obtained under the given conditions (unit: .

[0027] Furthermore, the actual operating conditions include at least one of static DC, AC / DC superposition, polarity reversal, and multi-frequency ripple.

[0028] Step 4: Optimization of the insulation structure of the converter transformer valve side bushing based on calculation results The electric field intensity distribution results were used to optimize the insulation structure design of the valve-side bushing. First, based on the electric field intensity distribution map, weak areas with high or uneven electric field intensity inside the valve-side bushing were identified, especially the peak electric field areas in critical locations such as the guide rod, the end of the capacitor screen, the shed skirt, and the flange connection. These areas, due to excessively strong or unevenly distributed electric fields, may lead to partial discharge or accelerate the aging of the insulation material. Based on the electric field intensity distribution in these weak areas, the corresponding design parameters were adjusted to change the electric field distribution and make it more uniform.

[0029] After adjusting the design parameters, the methods in steps two and three are used again to simulate the optimized bushing structure, comparing the changes in electric field distribution before and after optimization to verify the effectiveness of the optimization measures. If necessary, the design parameters are further adjusted to form an optimization-re-simulation feedback loop until the electric field distribution meets the requirements for safe operation. After multiple optimization iterations, the final converter transformer valve-side bushing structure design that meets the electric field intensity distribution requirements is obtained.

[0030] Furthermore, the insulation structure of the converter transformer valve side bushing is optimized, specifically including at least one of the following: adjusting the shape of the capacitor screen, adding a shielding layer, adjusting the conductor spacing, and changing the thickness of the insulation material layer; and after each adjustment, returning to steps two and three to recalculate the electric field intensity distribution until the electric field intensity distribution meets the preset requirements.

[0031] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the program being capable of implementing steps for a method for accurately calculating the electric field strength of a converter valve side bushing.

[0032] The present invention also provides a system for implementing a method for accurately calculating the electric field strength of a converter transformer valve-side bushing, comprising: The parameter determination module is used to experimentally determine and fit a model to establish the dependence of the conductivity of polymer insulating materials on temperature T and electric field strength E. And the dependence model of relative permittivity on temperature T and frequency f. ; The modeling module is used to establish an electrothermal coupling simulation model of the converter transformer valve side bushing. Based on the bushing structure geometry and boundary conditions, a three-dimensional finite element simulation model containing the bushing components is constructed using finite element analysis software. The insulation material parameters are substituted to establish the temperature field and electric field intensity control equations. The solution and calculation module is used to apply boundary excitation conditions corresponding to actual working conditions to the simulation model established by the modeling module and perform simulation to obtain the temperature distribution and electric field intensity distribution, and extract the maximum electric field intensity. ; The optimization design module is used to identify weak areas where the electric field intensity exceeds the allowable value based on the electric field intensity distribution obtained by the solution calculation module, adjust the bushing design parameters, and verify the optimization effect through simulation.

[0033] The beneficial effects of this invention are as follows: This invention provides a method for accurately calculating the electric field strength of the valve-side bushing of a converter transformer. It reveals the interaction between the nonlinear dielectric properties of polymer insulating materials and their internal electric field distribution, effectively improving the calculation accuracy of the internal electric field distribution of the valve-side bushing. This provides a theoretical and technical basis for optimizing the internal field strength and designing the insulation structure of the valve-side bushing of a converter transformer under complex operating stress.

[0034] The present invention provides an accurate electric field strength calculation system for converter transformer valve side bushings, which can more accurately identify weak areas in the electric field distribution, guide the insulation structure design of converter transformer valve side bushings under extreme conditions such as high temperature, high field and complex voltage waveforms, ensure uniform electric field strength of bushings, improve their resistance to partial discharge, and ensure long-term stable operation of equipment.

[0035] This invention provides a new approach to optimizing the internal electric field and designing the insulation structure of the valve-side bushing of a converter transformer, and has significant engineering application value and technical significance.

[0036] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a technical flowchart of a method for accurately calculating the electric field strength of the bushing on the side of a converter transformer valve; Figure 2 This is a roadmap for optimizing the insulation structure of the converter transformer valve side bushing. Figure 3 This is a three-dimensional finite element model of the electrothermal coupling of the converter valve side bushing; Figure 4 This is the electric field distribution diagram without considering the nonlinear parameters of the insulating material; Figure 5 This is an electric field distribution diagram considering the nonlinear parameters of the insulating material. Detailed Implementation

[0038] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0040] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0041] The following is in conjunction with the appendix Figure 1-5 The embodiments of the present invention will be described in further detail below.

[0042] Figure 1 This is a technical flowchart of a method for accurately calculating the electric field intensity of the bushing on the side of a converter transformer valve. Figure 2 This is a roadmap for optimizing the insulation structure of the converter transformer valve side bushing.

[0043] In a preferred embodiment, taking the 800kV epoxy valve side bushing as an example, the insulation material of the converter transformer valve side bushing was determined to be epoxy resin impregnated paper (RIP) through research and experiments.

[0044] First, it is necessary to experimentally determine the dielectric properties of the material under different conditions, that is, the dynamic changes of conductivity and dielectric constant under different conditions, and then establish a dependency model.

[0045] Prepare RIP material samples and place them in a temperature-controlled electrode system. Apply different DC electric field strengths (e.g., 1 kV / mm to 20 kV / mm) at different operating temperatures (e.g., 25℃, 50℃, 80℃, 120℃), measure their leakage current, and calculate the corresponding conductivity values.

[0046] The relative permittivity of RIP materials was measured using a broadband dielectric spectrometer at different temperatures (e.g., 25℃, 50℃, 80℃, 120℃) and different frequencies (e.g., 1Hz, 50Hz, 100Hz, 1kHz).

[0047] Secondly, the relationships between these parameters and temperature, electric field, and frequency are determined using fitting methods. These data will be used as input to establish conductivity and dielectric constant models adapted to different temperature conditions.

[0048] The massive experimental data obtained were imported into the data processing software MATLAB, and the nonlinear least squares method was used to fit the data to... A temperature-electric field dependent model for the conductivity of this specific RIP material was established. , , , , m are correlation coefficients, and reference temperature Set to 25℃.

[0049] Fit the data to A temperature-frequency dependence model of the dielectric constant of this specific RIP material was established. , , All coefficients are polynomials, with reference dielectric constant. The value is 3.5, and the reference frequency f0 is set to 50 Hz.

[0050] Using COMSOL Multiphysics software, a three-dimensional finite element model of the 800kV valve-side bushing was created based on the design drawings, as shown in the attached figure. Figure 3 As shown in the figure, the model includes a central conductive rod, a capacitor bank, a RIP insulating core, a grounding flange, and an equalizing ring.

[0051] Steady-state electric field analysis was employed, combined with the established dynamic conductivity and dielectric constant model, to obtain the electric field intensity distribution under given boundary excitation conditions. To evaluate the impact of temperature changes on the calculated electric field intensity, the conductivity and dielectric constant of the RIP material were kept constant, resulting in a baseline electric field intensity distribution.

[0052] After the solution is completed, a complete distribution cloud map of the electric field intensity E inside the bushing is output, and the maximum electric field intensity of the entire insulation region is extracted. The electric field distribution cloud map of this embodiment is attached, and its location is determined. Figure 4 As shown.

[0053] Finally, insulation structure optimization based on calculation results. Analysis Appendix Figure 4 The electric field distribution cloud map shows that the maximum electric field strength occurs at the axial end of the outermost capacitor screen, with a value of 10.69 V / m * 10⁻¹⁰. -6 Meanwhile, there is also a phenomenon of field strength concentration at the base of the umbrella skirt and near the flange.

[0054] To address the issue of excessively high electric field strength at the ends of the capacitor bank, optimization measures were implemented. The optimized structural model was updated while maintaining all material models and boundary excitation conditions, and simulation calculations were performed again. This embodiment uses a ±800kV valve-side bushing as an example, extending the outermost two layers of the capacitor bank by 100mm at each end and performing geometric smoothing on all ends. After optimization, the maximum electric field strength at the ends of the capacitor bank was reduced from 10.69V / m*10 -6 Reduced to 8.91V / m*10 -6 Furthermore, the electric field distribution is more uniform, indicating that the optimization measures are effective.

[0055] To highlight the advantages of this invention, a comparative simulation is set up: using the traditional method that does not consider the nonlinear parameters of the insulating material, all material parameters are fixed as constants under normal temperature and electric field strength, and the above calculation is repeated. The resulting two-dimensional contour plot of the electric field distribution is shown in the appendix. Figure 5 As shown.

[0056] Based on this, the maximum electric field values ​​at key points such as the guide rod of the epoxy valve side sleeve, the axial end of the capacitor screen, the skirt, and near the flange are calculated. The results of the maximum electric field strength at key locations under the two calculation methods are shown in (unit: V / m*10). -6 The comparison is shown below:

[0057] Traditional methods underestimate the electrical conductivity of materials in high-field and high-temperature regions, resulting in generally lower calculated field strengths. For example, the calculated field strength at the end of a capacitor screen is only 8.28V / m*10. -6 It cannot accurately reflect the true degree of electric field distortion, which can cause safety hazards in the design.

[0058] The method of this invention accurately captures the effect of changes in material properties on the electric field distribution, and the calculated field strength is higher and more realistic. It can effectively identify insulation weaknesses that are masked by traditional methods, and provides a reliable basis for precise optimization.

[0059] By comparing the results with control simulations, the influence of the nonlinear characteristics of polymer insulation materials on the calculated electric field strength of the converter transformer side bushing was quantified.

[0060] Appendix Figure 3 A three-dimensional finite element model of the electrothermal coupling of the converter valve side bushing is attached. Figure 4 , 5 This invention provides a two-dimensional cloud map of the electric field intensity distribution inside the converter transformer valve-side bushing, taking into account the nonlinear parameters of the insulation material. It can be applied to high-voltage power transmission projects to guide the insulation optimization design of the converter transformer valve-side bushing, ensuring safe operation of the equipment under complex and harsh conditions, and has good environmental versatility.

[0061] In summary, this invention provides a method and system for accurately calculating the electric field strength of the converter transformer valve-side bushing, demonstrating the interaction between complex stress conditions such as high temperature and high field and the dynamic changes in the electric field distribution inside the converter transformer valve-side bushing. Furthermore, verification shows that, compared with traditional constant parameter models, the method provided by this invention can more accurately simulate the nonlinear behavior of the conductivity and dielectric constant of polymer insulating materials under different operating conditions, significantly improving the calculation accuracy of the electric field strength inside the converter transformer valve-side bushing.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for accurately calculating the electric field strength of a converter transformer valve-side bushing, characterized in that, Includes the following steps: S1: Determine the nonlinear parameters of the polymer insulating material, and establish a model for the dependence of the material's conductivity on temperature T and electric field strength E through experimental measurement and fitting. And the dependence model of relative permittivity on temperature T and frequency f. ; S2: Establish an electrothermal coupling simulation model of the converter transformer valve side bushing. Based on the structural geometry and boundary conditions of the converter transformer valve side bushing, establish a three-dimensional finite element model containing each component of the bushing. Substitute the insulation material parameters and establish the temperature field and electric field intensity control equations. S3: Solve for the electric field intensity distribution. In the electrothermal coupling simulation model, apply boundary excitation conditions corresponding to the actual working conditions and perform simulation to obtain the temperature distribution T(x) and electric field intensity distribution E(x), and extract the maximum electric field intensity. ; S4: Based on the calculation results, optimize the insulation structure of the converter transformer valve side bushing, identify weak areas according to the electric field intensity distribution, adjust the design parameters, and verify the optimization effect through simulation.

2. The method for accurately calculating the electric field strength of the converter transformer valve side bushing according to claim 1, characterized in that, In step S1, the conductivity dependence model Defined by the following expression: in, For insulating materials at temperature and electric field strength Conductivity under certain conditions; Reference temperature and the reference conductivity under zero electric field conditions; This is the temperature influence coefficient; This is the electric field influence coefficient; This refers to the current temperature of the insulating material. For reference temperature; Electric field strength; This is the power exponent of the effect of the electric field.

3. The method for accurately calculating the electric field strength of the converter transformer valve side bushing according to claim 1, characterized in that, In step S1, the dependence model of the relative permittivity Defined by the following expression: in, For insulating materials at temperature ,frequency Relative permittivity under the given conditions; Reference temperature Reference frequency The reference relative permittivity; The linear coefficient of the dielectric constant with respect to temperature change; This is the logarithmic coefficient of the frequency change with respect to the dielectric constant; The voltage excitation frequency; The reference frequency is 50 Hz.

4. The method for accurately calculating the electric field strength of the converter transformer valve side bushing according to claim 1, characterized in that, In step S2, the temperature field control equation of the electrothermal coupling simulation model is: in, Density of the insulating material; Specific heat capacity of insulating materials; For temperature field; For time; Let be the thermal conductivity of the material, denoted as a function of temperature, and obtained by experimental measurement; For the term "electric heat source", it represents the heat generation power density of the insulating material under the action of an electric field; For insulating materials at temperature and electric field strength Conductivity under certain conditions; The electric field intensity vector; The steady-state electric field intensity control equation of the electrothermal coupling simulation model is as follows: in, It is the vacuum permittivity; For insulating materials at temperature ,frequency Relative permittivity under the given conditions; The electric potential gradient is the electric field intensity vector. .

5. The method for accurately calculating the electric field strength of the converter transformer valve side bushing according to claim 4, characterized in that, In step S3, the maximum electric field strength is calculated using the following expression: in, In the region ,temperature ,frequency The maximum electric field strength was obtained under the given conditions.

6. The method for accurately calculating the electric field strength of the converter transformer valve side bushing according to claim 1, characterized in that, In step S3, the actual operating conditions include at least one of static DC, AC / DC superposition, polarity reversal, and multi-frequency ripple.

7. The method for accurately calculating the electric field strength of the converter transformer valve-side bushing according to claim 1, characterized in that, In step S4, the optimization design of the bushing insulation structure on the converter transformer valve side specifically includes: Adjust the shape of the capacitive screen, add a shielding layer, adjust the conductor spacing, or change the thickness of the insulating material layer by at least one of the following methods; and after each adjustment, return to steps S2 and S3 to recalculate the electric field intensity distribution until the electric field intensity distribution meets the preset requirements.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method as described in any one of claims 1 to 7.

9. A system for implementing the method as described in claim 1, characterized in that, include: The parameter determination module is used to experimentally determine and fit a model to establish the dependence of the conductivity of polymer insulating materials on temperature T and electric field strength E. And the dependence model of relative permittivity on temperature T and frequency f. ; The modeling module is used to establish an electrothermal coupling simulation model of the converter transformer valve side bushing. Based on the bushing structure geometry and boundary conditions, a three-dimensional finite element simulation model containing the bushing components is constructed using finite element analysis software. The insulation material parameters are substituted to establish the temperature field and electric field intensity control equations. The solution and calculation module is used to apply boundary excitation conditions corresponding to actual working conditions to the simulation model established by the modeling module and perform simulation to obtain the temperature distribution and electric field intensity distribution, and extract the maximum electric field intensity. ; The optimization design module is used to identify weak areas where the electric field intensity exceeds the allowable value based on the electric field intensity distribution obtained by the solution calculation module, adjust the bushing design parameters, and verify the optimization effect through simulation.

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