Manufacturing method of gradient insulating member

Abstract

The method for manufacturing a graded insulating member includes: calculating a common spatial optimization target of the conductivity and dielectric constant inside the graded insulating member structure by a topology optimization method; respectively calculating the optimum distribution of conductivity and dielectric constant; obtaining a high dielectric region having high conductivity and high dielectric constant; calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region; determining the amount of filler added in the manufacturing material of the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value to complete the manufacturing of the high dielectric part; and using vacuum injection to complete the manufacturing of the remaining low insulating region of the insulating member. The method can rapidly optimize the graded insulating structure to suppress local electric field distortion, can be applied to the operating conditions under the action of different voltages, can realize the precise control of the manufacturing of the graded insulating member, and the insulating effect of the manufactured graded insulating member is better.

Description

[Technical field]

[0001] The present invention relates to the technical field of high voltage equipment manufacturing, and in particular to a method for manufacturing graded insulating members. [Background technology]

[0002] A substation system is composed of a series of electrical equipment, and in the substation system, insulating parts play a role in isolating potential and supporting conductors. In the design of the insulation structure, it is necessary to determine the strength of the equipment required to withstand electricity, taking into account the various voltages that may occur in the system in which the equipment is installed and the characteristics of the protective devices, in order to reduce the probability of the insulation of the equipment being damaged and the impact of various voltages acting on the equipment on the continuous operation of the equipment to an economically and operationally acceptable level. Many of the insulation structures used in conventional construction are homogeneous insulators with uniform material properties, which causes local electric field distortion problems in substation systems. Excessively high electric field strength is prone to cause partial discharges, and homogeneous insulators with uniform properties used in construction are prone to insulation breakdown accidents during long-term operation, causing equipment failure and ultimately system failure. For the local electric field distortion problem, functionally graded materials (FGMs) provide a new mode and a new approach to solving this problem. Functionally graded materials refer to heterogeneous composite materials whose performance changes continuously or quasi-continuously in one or more dimensional directions.

[0003] Conventional manufacturing methods for gradient insulating components are roughly divided into three types: lamination method, centrifugal method, and 3D printing method. However, the conventional manufacturing methods have low controllability and the insulating effect of the manufactured products is low. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present invention provide a method for manufacturing a graded insulating member, which can achieve precise control of the manufacturing of the graded insulating member, and the manufactured graded insulating member has a higher insulating effect. [Means for solving the problem]

[0005] An embodiment of the present invention provides a method for manufacturing a graded insulation member, the method comprising: calculating a common spatial optimization goal of the electrical conductivity and permittivity inside the graded insulating member structure by a topology optimization method, the optimization goal being to reduce the electric field intensity in a predetermined region of the graded insulating member; calculating, based on the spatial optimization target, a conductivity optimum distribution of conductivity for the spatial optimization target and a permittivity optimum distribution of permittivity for the spatial optimization target respectively; obtaining a high dielectric region by taking an intersection between a high conductivity region in the conductivity optimum distribution and a high dielectric constant region in the dielectric constant optimum distribution, and calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region; determining an amount of filler to be added to a manufacturing material of the high dielectric region based on the uniform dielectric constant value and the uniform conductivity value; , high completing fabrication of the dielectric portion; The above and b) fixing the high dielectric portion to the mold and using vacuum injection means to complete the fabrication of the remaining low dielectric region of the insulating member.

[0006] Preferably, the predetermined area specifically includes a predetermined local area or a gas-solid interface of the gradient insulating member; The step of calculating a common spatial optimization goal of the conductivity and permittivity inside the graded insulating member structure by a topology optimization method, with the optimization goal being to reduce the electric field intensity in a predetermined region of the graded insulating member, specifically includes: The method includes a step of obtaining a common spatial optimization goal f of the dielectric constant and the conductivity inside the graded insulating member structure by a level set algorithm in a topology optimization method, with the optimization goal being to reduce the electric field intensity in the local region or at the gas-solid interface; however, JPEG0007648805000001.jpg14130, Ω is a calculation domain of the electric field integral term of the graded insulating member, Ω1 is a dielectric parameter designable domain, Ω2 is a predetermined first optimization target domain, Ω3 is a predetermined second optimization target domain, and C ref is a normalization parameter of the optimization component in the electric field integral term, r is the abscissa in the two-dimensional axisymmetric coordinate system, z is the ordinate in the two-dimensional axisymmetric coordinate system, E is the electric field intensity in the first optimization target region, and E mean is the average electric field strength in the second optimization target region, (r,z)∈Ω1; The dielectric constant ε for the spatial optimization goal f ri and conductivity σ ri The constraints on the electric field strength are as follows: Contains JPEG0007648805000002.jpg57139, where ε ri , ε max and ε min are the dielectric constant, the upper limit of the dielectric constant change, and the lower limit of the dielectric constant in the i-th grid after dividing the dielectric parameter designable region Ω1 into grids, respectively, and σ ri , σ max and σ min are the conductivity, the upper limit of the conductivity change, and the lower limit of the conductivity in the i-th grid, respectively, m is the boundary curve shape control coefficient, and ρ i is the density in the ith grid and A is the area size of the dielectric graded region.

[0007] Furthermore, the step of calculating an optimal conductivity distribution for the spatial optimization target for the electrical conductivity and an optimal permittivity distribution for the spatial optimization target for the permittivity based on the spatial optimization target can be specifically changing a distribution of permittivity while maintaining electrical conductivity, and obtaining an optimized permittivity distribution based on the spatial optimization goal; A step of changing the distribution of conductivity while maintaining the dielectric constant on the obtained optimal dielectric constant optimized distribution, and obtaining an optimal conductivity optimized distribution based on the spatial optimization target; The method includes a step of changing a distribution of the permittivity while maintaining the conductivity based on the acquired optimal conductivity optimized distribution, acquiring an optimal dielectric constant optimized distribution based on the spatial optimization target, changing a distribution of the conductivity while maintaining the dielectric constant on the acquired optimal dielectric constant optimized distribution, acquiring an optimal conductivity optimized distribution based on the spatial optimization target, and repeating the process of acquiring a conductivity optimized distribution and a dielectric constant optimized distribution a predetermined number of times, and setting the most recently acquired conductivity optimized distribution as the conductivity optimized distribution and the most recently acquired dielectric constant optimized distribution as the dielectric constant optimized distribution.

[0008] In a preferred embodiment, a high dielectric region is obtained by taking a common portion between the high conductivity region in the optimum distribution of the electrical conductivity and the high dielectric constant region in the optimum distribution of the dielectric constant, and a uniform dielectric constant of the high dielectric region is obtained. value and uniform conductivity value Specifically, the step of calculating A step of determining a region in the optimal conductivity distribution where the conductivity is greater than a first predetermined value as a high conductivity region; A step of determining a region in which the dielectric constant in the optimal dielectric constant distribution is greater than a second predetermined value as a high dielectric constant region; obtaining the high dielectric constant region by performing a small hemispherical transition on regions of discontinuity and localized peaks after the intersection of the high conductivity region and the high dielectric constant region; calculating an average value of the conductivity within the high dielectric region as the uniform conductivity value based on the optimal conductivity distribution; and calculating an average value of the dielectric constant within the high dielectric region as the uniform dielectric constant value based on the optimum dielectric constant distribution.

[0009] Preferably, the uniform dielectric constant value and the uniform conductivity value are based on the filler in the manufacturing material of the high dielectric region. Addition amount and completing the manufacturing of the high dielectric part, specifically, calculating the filler percentage based on a material property parameter of the filler, a material property parameter of the manufacturing material, the uniform dielectric constant value, and the uniform conductivity value; Adding the surface hydroxyl modified single-walled carbon nanotubes as the filler in the ratio to the manufacturing material to form a composite slurry; and printing the composite slurry by light-curing 3D printing to complete the manufacture of the high dielectric part.

[0010] The manufacturing method of the gradient insulating member according to the present invention includes calculating a common spatial optimization target of the conductivity and dielectric constant inside the gradient insulating member structure by a topology optimization method, respectively calculating an optimum conductivity distribution and an optimum dielectric constant distribution, obtaining a high dielectric region having a high conductivity and a high dielectric constant, calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region, and determining an additive amount of a filler in a manufacturing material of the high dielectric region based on the uniform dielectric constant value and the uniform conductivity value. , high The dielectric part is fabricated, and the remaining low-insulation area of ​​the insulating member is fabricated by vacuum injection. This method can rapidly optimize the gradient insulating structure to suppress local electric field distortion, can be applied to the operating conditions under the action of different voltages, can realize the precise control of the fabrication of the gradient insulating member, and the insulating effect of the fabricated gradient insulating member is higher. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing a method for manufacturing a graded insulating member according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] In the following, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, but obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments, and all other embodiments that can be obtained by those skilled in the art based on the embodiments of the present invention without any creative ingenuity are all within the protection scope of the present invention.

[0013] An embodiment of the present invention provides a method for manufacturing a graded insulating member. FIG. 1 is a flow diagram of a method for manufacturing a graded insulating member according to an embodiment of the present invention, the method including steps S1 to S5: Step S1: Calculate a common spatial optimization goal of the conductivity and permittivity of the gradient insulating member structure by a topology optimization method, with the optimization goal being to reduce the electric field intensity in a predetermined region of the gradient insulating member; Step S2 calculates, based on the spatial optimization target, an optimal distribution of electrical conductivity for the spatial optimization target and an optimal distribution of dielectric constant for the spatial optimization target, respectively; Step S3: obtaining a high dielectric constant region by taking a common part between the high conductivity region in the optimum electrical conductivity distribution and the high dielectric constant region in the optimum dielectric constant distribution, and calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric constant region; Step S4 determines an amount of filler to be added to the manufacturing material of the high dielectric region based on the uniform dielectric constant value and the uniform conductivity value. , high Complete the manufacture of the dielectric part; Step S5 fixes the high dielectric part in the mold and uses vacuum injection means to complete the fabrication of the remaining low dielectric area of ​​the insulating member.

[0014] In the specific implementation of this embodiment, the optimization goal is to reduce the electric field intensity in a certain region of the graded insulating member, and a common spatial optimization goal of the internal electric field intensity of the graded insulating member in terms of the dielectric constant and the electrical conductivity is obtained by the topology optimization method, where the internal electric field intensity of the graded insulating member represents the distortion state of the internal electric field, and the electric field intensity is a function of the dielectric constant and the electrical conductivity and is affected by the dielectric constant and the electrical conductivity; Based on the obtained spatial optimization target of electric field intensity, calculate an optimal distribution of conductivity for the spatial optimization target and an optimal distribution of permittivity for the spatial optimization target respectively; Calculating a high conductivity region in the optimum conductivity distribution, calculating a high permittivity region in the optimum permittivity distribution, obtaining a high permittivity region by taking the intersection of the two, and calculating a uniform permittivity value and a uniform conductivity value of the high permittivity region based on the optimum conductivity distribution and the optimum permittivity distribution; determining an amount of filler to be added to a manufacturing material of the high dielectric region based on the uniform dielectric constant value and the uniform conductivity value; , high Complete the manufacture of the dielectric part, The high dielectric portion is secured to the mold and vacuum injection means is used to complete the fabrication of the remaining low dielectric regions of the insulating member.

[0015] A method for manufacturing a graded insulating member according to an embodiment of the present invention includes: calculating a common spatial optimization target of the conductivity and dielectric constant within the graded insulating member structure by a topology optimization method, with the optimization target being to reduce the electric field intensity in a predetermined region of the graded insulating member; calculating an optimal conductivity distribution of the conductivity for the spatial optimization target and an optimal dielectric constant distribution of the dielectric constant for the spatial optimization target based on the spatial optimization target; obtaining a high dielectric region by taking a common portion between a high conductivity region in the optimal conductivity distribution and a high dielectric constant region in the optimal dielectric constant distribution; calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region; and determining an amount of filler to be added to a manufacturing material for the high dielectric region based on the uniform dielectric constant value and the uniform conductivity value. , high The dielectric part is manufactured, the high dielectric part is fixed in the mold, and the remaining low insulating area of ​​the insulating member is manufactured by vacuum injection means, so that the manufacturing of the gradient insulating member can be precisely controlled, and the insulating effect of the manufactured gradient insulating member is better.

[0016] In another embodiment of the present invention, the predetermined area specifically includes a predetermined local area or a gas-solid interface of the gradient insulating member; Specifically, step S1 includes the following steps: The method includes a step of obtaining a common spatial optimization goal f of the dielectric constant and the conductivity inside the graded insulating member structure by a level set algorithm in a topology optimization method, with the optimization goal being to reduce the electric field intensity in the local region or at the gas-solid interface; however, JPEG0007648805000003.jpg24130, Ω is a calculation domain of the electric field integral term of the graded insulating member, Ω1 is a dielectric parameter designable domain, Ω2 is a predetermined first optimization target domain, Ω3 is a predetermined second optimization target domain, and C ref is a normalization parameter of the optimization component in the electric field integral term, r is the abscissa in the two-dimensional axisymmetric coordinate system, z is the ordinate in the two-dimensional axisymmetric coordinate system, E is the electric field intensity in the first optimization target region, and E mean is the average electric field strength in the second optimization target region, (r,z)∈Ω1; The dielectric constant ε for the spatial optimization goal f ri and conductivity σ ri The constraints on the electric field strength are as follows: Contains JPEG0007648805000004.jpg63160, where ε ri , ε max and ε min are the dielectric constant, the upper limit of the dielectric constant change, and the lower limit of the dielectric constant in the i-th grid after dividing the dielectric parameter designable region Ω1 into grids, respectively, and σ ri , σ max and σ min are the conductivity, the upper limit of the conductivity change, and the lower limit of the conductivity in the i-th grid, respectively, m is the boundary curve shape control coefficient, and ρ i is the density in the ith grid and A is the area size of the dielectric graded region.

[0017] In the specific implementation of this embodiment, the variables of dielectric constant and conductivity are designed to be variables of the spatial optimization goal, and the optimization goal is to reduce the electric field intensity in the local region of the graded insulating member or at the gas-solid interface, and a common spatial optimization goal f of the dielectric constant and conductivity inside the insulating structure is obtained forward and backward by the level set algorithm in the topology optimization method.

[0018] however, JPEG0007648805000005.jpg21148, Ω is a calculation domain of the electric field integral term of the graded insulating member, Ω1 is a dielectric parameter designable domain, Ω2 is a predetermined first optimization target domain, Ω3 is a predetermined second optimization target domain, and C ref is a normalization parameter of the optimization component in the electric field integral term, r is the abscissa in the two-dimensional axisymmetric coordinate system, z is the ordinate in the two-dimensional axisymmetric coordinate system, E is the electric field intensity in the first optimization target region, and E mean is the average electric field strength within the second optimization target region, (r,z)∈Ω1.

[0019] Furthermore, the dielectric parameter designable region Ω1 is divided into grids, and the dielectric constant ε ri and conductivity σ ri The constraints on the electric field strength are as follows: Contains JPEG0007648805000006.jpg60148, where ε ri , ε max and ε min are the permittivity, upper limit of permittivity change, and lower limit of permittivity in the i-th grid, respectively, and σ ri , σ max and σ min are the conductivity, upper limit of conductivity change, and lower limit of conductivity in the i-th grid, respectively, m is the boundary curve shape control coefficient, and ρ i is the density in the ith grid and A is the area size of the dielectric graded region.

[0020] The level set algorithm in topology optimization can discretize the region of the designed graded insulating member and establish mathematical models of the conductivity, permittivity and optimization objectives, thereby quickly optimizing the internal structure of the graded insulating member to suppress local electric field distortion, and the optimization objectives can realize precise control over the manufacturing of the graded insulating member.

[0021] In another embodiment of the present invention, step S2 specifically includes: changing a distribution of permittivity while maintaining electrical conductivity, and obtaining an optimized permittivity distribution based on the spatial optimization goal; A step of changing the distribution of conductivity while maintaining the dielectric constant on the obtained optimal dielectric constant optimized distribution, and obtaining an optimal conductivity optimized distribution based on the spatial optimization target; While maintaining the electrical conductivity distribution, the dielectric constant spatial distribution is optimized, and then the electrical conductivity spatial distribution is optimized on the dielectric constant distribution obtained by the optimization. After repeating this process multiple times, the optimal spatial distributions of dielectric constant and electrical conductivity are obtained.

[0022] By using an iterative method of alternately optimizing the dielectric constant and the conductivity, the insulation properties of the optimized graded insulating member are more accurate and can be applied to work under different voltages, such as for the dielectric constant graded insulating member under AC voltage conditions and for the conductivity graded insulating member under DC voltage conditions.

[0023] In another embodiment of the present invention, step S3 specifically includes: A step of determining a region in the optimal conductivity distribution where the conductivity is greater than a first predetermined value as a high conductivity region; A step of determining a region in which the dielectric constant in the optimal dielectric constant distribution is greater than a second predetermined value as a high dielectric constant region; obtaining the high dielectric constant region by performing a small hemispherical transition on regions of discontinuity and localized peaks after the intersection of the high conductivity region and the high dielectric constant region; calculating an average value of the conductivity within the high dielectric region as the uniform conductivity value based on the optimal conductivity distribution; and calculating an average value of the dielectric constant within the high dielectric region as the uniform dielectric constant value based on the optimum dielectric constant distribution.

[0024] In a specific embodiment of the present invention, a region in which the conductivity in the optimal conductivity distribution is greater than a first predetermined value is defined as a high conductivity region, A region in which the dielectric constant in the optimal dielectric constant distribution is greater than a second predetermined value is defined as a high dielectric constant region; The first predetermined value may be preset as a specific value exceeding 90% of the conductivity of the optimal conductivity distribution, and the first predetermined value is used to select 10% of the region having the highest conductivity as a high conductivity region; The second predetermined value may be preset as a specific value exceeding 90% of the dielectric constant of the optimal dielectric constant distribution, and the second predetermined value is used to select a region having the highest dielectric constant of 10% as a high dielectric constant region; In addition, the first predetermined value and the 2 may be a constant value for selecting the high conductivity region and the high permittivity region; To ensure that there are no electric field distortion points in the high dielectric region, the intersection between the high conductivity region and the high dielectric region is taken, and after taking the intersection, a flat edge transition is performed on regions with discontinuous boundaries and regions with localized peaks to obtain the high dielectric region.

[0025] Calculating an average value of the conductivity within the high dielectric region as the uniform conductivity value based on the optimal conductivity distribution; Based on the optimum dielectric constant distribution, an average value of the dielectric constant within the high dielectric region is calculated as the uniform dielectric constant value.

[0026] In another embodiment of the present invention, step S4 specifically includes: calculating the filler percentage based on a material property parameter of the filler, a material property parameter of the manufacturing material, the uniform dielectric constant value, and the uniform conductivity value; Adding the surface hydroxyl modified single-walled carbon nanotubes as the filler in the ratio to the manufacturing material to form a composite slurry; and printing the composite slurry by light-curing 3D printing to complete the manufacture of the high dielectric part.

[0027] In the specific implementation of this embodiment, the surface hydroxyl modified single-walled carbon nanotube is used as a filler, and the photosensitive resin is used as a manufacturing material; Calculate the percentage of the filler based on the material property parameters of the filler, the material property parameters of the manufacturing material, the uniform dielectric constant value and the uniform conductivity value, and change the material properties of the composite slurry by changing the percentage of the filler in the composite slurry, wherein the material properties include viscosity, hardening depth during printing, dielectric constant of the material after molding, conductivity of the material after molding and tensile strength of the material after molding; Table 1 shows the material properties of the composite slurries with different filler ratios, using surface hydroxyl modified single-walled carbon nanotubes as the filler and photosensitive resin as the manufacturing material.

[0028] [Table 1]

[0029] The use of surface hydroxyl-modified single-walled carbon nanotubes as a filler is single Compared with using multi-walled carbon nanotubes as a filler, using surface hydroxyl modified single-walled carbon nanotubes at the same mass fraction has lower composite slurry viscosity, higher composite slurry cure depth, wider range of dielectric constant and conductivity change, and stronger tensile strength.

[0030] Table 2 shows the material properties of the composite slurries with unmodified single-walled carbon nanotubes as the filler and photosensitive resin as the manufacturing material, corresponding to different filler ratios.

[0031] [Table 2]

[0032] Adding the surface hydroxyl modified single-walled carbon nanotubes as the filler in the ratio to the manufacturing material to form a composite slurry; The composite slurry is printed by light-curing 3D printing to complete the fabrication of the high dielectric portion of the graded insulating member.

[0033] The fabricated high dielectric portion is then fixed in a mold and vacuum injection means is used to complete the fabrication of the remaining low dielectric members of the insulating structure, thus completing the fabrication of the graded insulating member.

[0034] Using surface hydroxyl modified single-walled carbon nanotubes as a filler, it is possible to adjust both the dielectric constant and electrical conductivity of the material, while it has better processing performance and material strength than other functional fillers. Manufacturing high dielectric parts by 3D printing can quickly realize rapid and high-precision production manufacturing of optimized complex structures, while the polymer material itself has high compatibility with the polymer supporting the insulator, and the interfacial adhesive strength is high.

[0035] The method for manufacturing a graded insulating member according to the present invention includes: calculating a common spatial optimization target of the conductivity and dielectric constant within the graded insulating member structure by a topology optimization method, with the optimization target being to reduce the electric field intensity in a predetermined region of the graded insulating member; calculating an optimal conductivity distribution of the conductivity for the spatial optimization target and an optimal dielectric constant distribution of the dielectric constant for the spatial optimization target based on the spatial optimization target; obtaining a high dielectric region by taking a common portion between a high conductivity region in the optimal conductivity distribution and a high dielectric constant region in the optimal dielectric constant distribution; calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region; and determining an amount of filler to be added to a manufacturing material for the high dielectric region based on the uniform dielectric constant value and the uniform conductivity value. , high The dielectric part is manufactured, the high dielectric part is fixed in the mold, and the remaining low insulation area of ​​the insulating member is manufactured by vacuum injection. The level set algorithm in topology optimization is used to discretize the design domain and establish the optimization objectives of electrical conductivity and dielectric constant, so that the gradient insulating structure for suppressing local electric field distortion can be rapidly optimized, and the optimized insulating structure can be applied to work under the action of different voltages by using the iterative method of alternately optimizing the dielectric constant and the electrical conductivity. The surface hydroxyl modified single-walled carbon nanotube is used as a filler to realize the adjustment of both the dielectric constant and the electrical conductivity of the material, and has better processing performance and material strength. The rapid and high-precision manufacturing of the gradient insulating member is realized. The manufacturing method of the gradient insulating member according to the present invention can realize the precise control of the manufacturing of the gradient insulating member, and the insulating effect of the manufactured gradient insulating member is better.

[0036] The above is merely a preferred embodiment of the present invention. Furthermore, those skilled in the art may make various improvements and modifications without departing from the principles described in the present invention, and these improvements and modifications should also be considered as being within the scope of protection of the present invention.

Claims

1. calculating a common spatial optimization goal of the electrical conductivity and permittivity inside the graded insulating member structure by a topology optimization method, the optimization goal being to reduce the electric field intensity in a predetermined region of the graded insulating member; calculating, based on the spatial optimization objective, an optimal electrical conductivity distribution of the spatial optimization objective for electrical conductivity and an optimal permittivity distribution of the spatial optimization objective for permittivity respectively; obtaining a high dielectric region by taking an intersection between a high conductivity region in the conductivity optimum distribution and a high dielectric constant region in the dielectric constant optimum distribution, and calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region; determining an amount of filler to be added to the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value to complete the manufacture of the high dielectric portion; and fixing said high dielectric portion in a mold and completing the fabrication of the remaining low dielectric region of the insulating member using vacuum injection means.

2. The predetermined area specifically includes a predetermined local area or a gas-solid interface of the gradient insulating member; The step of calculating a common spatial optimization goal of the conductivity and permittivity inside the graded insulating member structure by a topology optimization method, with the optimization goal being to reduce the electric field intensity in a predetermined region of the graded insulating member, specifically includes: The method includes a step of obtaining a common spatial optimization goal f of the dielectric constant and the conductivity inside the graded insulating member structure by a level set algorithm in a topology optimization method, the optimization goal being to reduce the electric field intensity in the local region or at the gas-solid interface; however, where Ω is the computation domain of the electric field integral term of the graded insulating member, and Ω 1 is the dielectric parameter designable region, and Ω 2 is a predetermined first optimization target region, and Ω 3 is a predetermined second optimization target region, and C ref is a normalization parameter of the optimization component in the electric field integral term, r is the abscissa in the two-dimensional axisymmetric coordinate system, z is the ordinate in the two-dimensional axisymmetric coordinate system, E is the electric field strength in the first optimization target region, and E mean is the average electric field strength in the second optimization target region, (r, z) ∈ Ω 1 and The dielectric constant ε at the spatial optimization goal f ri and conductivity σ ri The constraints on the electric field strength are as follows: Including, where ε ri , ε max and ε min are the dielectric parameter designable regions Ω 1 are the permittivity, upper limit of permittivity change, and lower limit of permittivity in the i-th grid after dividing the grid, and σ ri , σ max and σ min are the conductivity, the upper limit of the conductivity change, and the lower limit of the conductivity in the i-th grid, respectively, m is the boundary curve shape control coefficient, and ρ i 2. The method of claim 1, wherein i is the density in the i-th grid and A is the area of ​​the dielectric gradient region.

3. The step of calculating the optimal conductivity distribution of the spatial optimization target for the electrical conductivity and the optimal permittivity distribution of the spatial optimization target for the permittivity based on the spatial optimization target specifically includes: changing a distribution of permittivity while maintaining electrical conductivity, and obtaining an optimized permittivity distribution based on the spatial optimization goal; A step of changing the distribution of conductivity while maintaining the dielectric constant on the obtained optimal dielectric constant optimized distribution, and obtaining an optimal conductivity optimized distribution based on the spatial optimization target; 3. The method for manufacturing a gradient insulating member according to claim 2, further comprising the steps of: changing a distribution of the dielectric constant while maintaining the conductivity based on the acquired optimal conductivity optimized distribution; acquiring an optimal dielectric constant optimized distribution based on the spatial optimization target; changing a distribution of the conductivity while maintaining the dielectric constant on the acquired optimal dielectric constant optimized distribution; acquiring an optimal conductivity optimized distribution based on the spatial optimization target; and repeating the process of acquiring a conductivity optimized distribution and a dielectric constant optimized distribution a predetermined number of times, and setting the most recently acquired conductivity optimized distribution as the conductivity optimized distribution and the most recently acquired dielectric constant optimized distribution as the dielectric constant optimized distribution.

4. The step of obtaining a high dielectric constant region by taking a common part between the high conductivity region in the optimum distribution of the electrical conductivity and the high dielectric constant region in the optimum distribution of the dielectric constant, and calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric constant region, specifically includes the steps of: A step of determining a region in the optimum conductivity distribution where the conductivity is greater than a first predetermined value as a high conductivity region; determining a region in which the dielectric constant in the optimal dielectric constant distribution is greater than a second predetermined value as a high dielectric constant region; obtaining the high dielectric constant region by performing a fillet transition on regions with discontinuous boundaries and regions with localized peaks after the intersection of the high conductivity region and the high dielectric constant region; calculating an average value of the conductivity within the high dielectric region as the uniform conductivity value based on the optimal conductivity distribution; and calculating an average value of the dielectric constant in the high dielectric region as the uniform dielectric constant value based on the optimum dielectric constant distribution.

5. The step of determining the amount of filler added in the manufacturing material of the high dielectric region based on the uniform dielectric constant value and the uniform conductivity value to complete the manufacturing of the high dielectric portion specifically includes: calculating the filler percentage based on a material property parameter of the filler, a material property parameter of the manufacturing material, the uniform dielectric constant value, and the uniform conductivity value; Adding the surface hydroxy-modified single-walled carbon nanotubes as the filler to the manufacturing material in the ratio to form a composite slurry; and printing the composite slurry by light-curing 3D printing to complete the manufacture of the high dielectric portion.

Images