CN114005628A - Preparation method of gradient insulating part - Google Patents
Preparation method of gradient insulating part Download PDFInfo
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- CN114005628A CN114005628A CN202111153554.1A CN202111153554A CN114005628A CN 114005628 A CN114005628 A CN 114005628A CN 202111153554 A CN202111153554 A CN 202111153554A CN 114005628 A CN114005628 A CN 114005628A
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Abstract
The invention discloses a preparation method of a gradient insulating component, which comprises the steps of calculating a common space optimization target of the conductivity and the dielectric constant in the gradient insulating component by adopting a topological optimization method; respectively calculating the optimal distribution of the conductivity and the optimal distribution of the dielectric constant; acquiring a high dielectric region with high conductivity and high dielectric constant, and calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region; and determining the addition amount of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value, completing the preparation of the high dielectric part, and completing the preparation of the residual low insulation region of the insulation part by adopting a vacuum pouring method. The method can quickly optimize the gradient insulation structure for inhibiting the local electric field distortion, can adapt to working occasions under the action of different voltages, can realize the accurate control of the preparation of the gradient insulation component, and has better insulation effect of the manufactured gradient insulation component.
Description
Technical Field
The invention relates to the technical field of high-voltage equipment manufacturing, in particular to a preparation method of a gradient insulating part.
Background
The power transmission and transformation system is composed of a series of electrical devices, and in the power transmission and transformation system, an insulating part plays a role in isolating electric potential and supporting a conductor. The design of the insulating structure requires the necessary electrical strength of the equipment to be determined taking into account the various voltages that may occur in the system in which the equipment is located, and the characteristics of the protective devices, in order to reduce the probability of damage to the insulation of the equipment and the impact on continuous operation caused by the various voltages acting on the equipment to a level that is tolerable both economically and operationally. Most of insulation structures used in the existing engineering are homogeneous insulation with uniform material characteristics, so that the problem of local electric field distortion exists in a power transmission and transformation system. Partial discharge is easily caused by excessively high field intensity, and insulation accidents are easily caused by uniform and homogeneous insulation used in engineering in the long-term operation process, so that equipment failure and even system failure are caused. For the problem of local electric field distortion, Functionally Graded Materials (FGM) provides a new model and a new approach for solving the problem. Functionally graded materials refer to heterogeneous composite materials with properties that vary continuously or quasi-continuously in one or more dimensions.
The existing preparation methods of gradient insulation parts can be roughly divided into three categories: lamination, centrifugation, and 3D printing methods. But the controllability of the existing preparation method is poor, and the insulation effect of the prepared product is not good.
Disclosure of Invention
The embodiment of the invention provides a preparation method of a gradient insulating component, which can realize accurate control of the preparation of the gradient insulating component, and the prepared gradient insulating component has better insulating effect.
The embodiment of the invention provides a preparation method of a gradient insulating part, which comprises the following steps:
taking reduction of electric field intensity of a preset area of a gradient insulating part as an optimization target, and calculating a space optimization target with common electric conductivity and dielectric constant in the gradient insulating part structure by adopting a topological optimization method;
respectively calculating the optimal conductivity distribution of the relative conductivity of the space optimization target and the optimal dielectric constant distribution of the relative dielectric constant of the space optimization target according to the space optimization target;
taking the intersection of the high-conductivity region in the conductivity optimal distribution and the high-dielectric-constant region in the dielectric-constant optimal distribution to obtain a high-dielectric region, and calculating the uniform dielectric constant value and the uniform conductivity value of the high-dielectric region;
determining the addition amount of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value, and completing the preparation of the high dielectric part;
and fixing the high-dielectric part in a metal mold, and finishing the preparation of the residual low-insulation area of the insulation part by adopting a vacuum pouring method.
Preferably, the preset area specifically includes: a preset local area or a gas-solid interface of the gradient insulating part;
the method for calculating the spatial optimization target of the common electric conductivity and dielectric constant in the gradient insulating part structure by using the topological optimization method and taking the electric field intensity of the preset area of the gradient insulating part as the optimization target specifically comprises the following steps
With the electric field intensity at the local area or the gas-solid interface reduced as an optimization target, solving a spatial optimization target f with common dielectric constant and conductivity in the gradient insulating part structure by adopting a level set algorithm in a topological optimization method;
wherein the content of the first and second substances,
omega is the calculation region of the electric field integral term of the gradient insulation part, omega1Designing the feasible region, Ω, for dielectric parameters2For a preset first optimization target region, Ω3For a preset second optimization target region, CrefIs a normalized parameter of an optimized component in an electric field integral term, r is an abscissa in a two-dimensional axisymmetric coordinate system, z is an ordinate in the two-dimensional axisymmetric coordinate system, E is an electric field intensity in the first optimization target areameanFor the average electric field strength within the second optimization target region, (r, z) ∈ Ω1；
The electric field strength of the space optimization target f with respect to the dielectric constant εriAnd electrical conductivity σriThe constraint conditions of (1) include:
wherein epsilonri、εmaxAnd εminRespectively designing feasible regions omega for the dielectric parameters1After the gridding, the dielectric constant in the ith grid, the upper limit of the change of the dielectric constant and the lower limit of the dielectric constant, sigmari、σmaxAnd σminRespectively the conductivity, the upper limit of the conductivity change and the lower limit of the conductivity in the ith grid, m is a control coefficient of the shape of a boundary curve, rhoiAnd A is the area size of the dielectric gradient region, which is the density in the ith grid.
Further, the calculating, according to the spatial optimization objective, the optimal conductivity distribution of the spatial optimization objective with respect to the conductivity and the optimal dielectric constant distribution of the spatial optimization objective with respect to the dielectric constant respectively includes:
under the condition that the conductivity is kept unchanged, changing the distribution of the dielectric constant, and obtaining the dielectric constant optimized distribution according to the space optimization target;
on the basis of the obtained optimal dielectric constant optimal distribution, keeping the dielectric constant unchanged, changing the conductivity distribution, and obtaining the optimal conductivity optimal distribution according to the space optimization target;
according to the obtained optimal conductivity optimization distribution, keeping the conductivity constant, changing the distribution of the dielectric constant, according to the space optimization target, obtaining the optimal dielectric constant optimization distribution, on the basis of the obtained optimal dielectric constant optimization distribution, keeping the dielectric constant, changing the distribution of the conductivity, and according to the space optimization target, obtaining the optimal conductivity optimization distribution; and circularly acquiring the process preset times of the conductivity optimized distribution and the dielectric constant optimized distribution, taking the latest acquired conductivity optimized distribution as the conductivity optimal distribution, and taking the latest acquired dielectric constant optimized distribution as the dielectric constant optimal distribution.
As a preferred scheme, the obtaining a high dielectric region by taking an intersection of a high conductivity region in the conductivity optimal distribution and a high dielectric constant region in the dielectric constant optimal distribution, and calculating a uniform dielectric constant and a uniform conductivity of the high dielectric region specifically includes:
taking a region with the conductivity larger than a first preset value in the conductivity optimal distribution as a high conductivity region;
taking a region with the dielectric constant larger than a second preset value in the optimal dielectric constant distribution as a high dielectric constant region;
taking intersection of the high conductivity region and the high dielectric constant region, and adopting small fillet transition to the discontinuous region of the boundary after taking intersection and the region with local tip to obtain the high dielectric region;
calculating an average value of the electrical conductivity in the high dielectric region as the uniform conductivity value according to the optimal distribution of the electrical conductivity;
and calculating the average value of the dielectric constant in the high dielectric region as the uniform dielectric constant value according to the optimal distribution of the dielectric constant.
Preferably, the determining the proportion of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value completes the preparation of the high dielectric part, specifically including:
calculating a proportion of the filler based on the material property parameter of the filler, the material property parameter of the preparation material, the uniform dielectric constant value, and the uniform conductivity value;
adding the single-walled carbon nanotube with the surface hydroxyl modified as the filler into the preparation material according to the proportion to obtain composite slurry;
and (3) adopting photocuring 3D printing composite slurry to finish the preparation of the high-dielectric part.
According to the preparation method of the gradient insulating component, a space optimization target common to the electric conductivity and the dielectric constant in the gradient insulating component structure is calculated by adopting a topological optimization method; respectively calculating the optimal distribution of the conductivity and the optimal distribution of the dielectric constant; acquiring a high dielectric region with high conductivity and high dielectric constant, and calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region; and determining the addition amount of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value, completing the preparation of the high dielectric part, and completing the preparation of the residual low insulation region of the insulation part by adopting a vacuum pouring method. The method can quickly optimize the gradient insulation structure for inhibiting the local electric field distortion, can adapt to working occasions under the action of different voltages, can realize the accurate control of the preparation of the gradient insulation component, and has better insulation effect of the manufactured gradient insulation component.
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Fig. 1 is a method for manufacturing a gradient insulation component according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a method for manufacturing a gradient insulating member, and referring to fig. 1, the method is a schematic flow chart of the method for manufacturing a gradient insulating member provided in the embodiment of the present invention, and the method includes steps S1 to S5:
s1, calculating a space optimization target with the conductivity and the dielectric constant inside the gradient insulation component structure common by adopting a topological optimization method with the electric field intensity of the preset area of the gradient insulation component reduced as an optimization target;
s2, respectively calculating the optimal conductivity distribution of the relative conductivity of the space optimization target and the optimal dielectric constant distribution of the relative dielectric constant of the space optimization target according to the space optimization target;
s3, taking the intersection of the high conductivity region in the conductivity optimal distribution and the high dielectric constant region in the dielectric constant optimal distribution to obtain a high dielectric region, and calculating the uniform dielectric constant value and the uniform conductivity value of the high dielectric region;
s4, determining the adding amount of the filler in the preparation material in the high dielectric area according to the uniform dielectric constant value and the uniform conductivity value, and completing the preparation of the high dielectric part;
and S5, fixing the high-dielectric part in a metal mold, and finishing the preparation of the residual low-insulation area of the insulation part by adopting a vacuum pouring method.
In the specific implementation of the embodiment, by taking the electric field strength of the preset area of the gradient insulating part as an optimization target, a common space optimization target of the electric field strength inside the gradient insulating part with respect to the dielectric constant and the conductivity is solved by adopting a topological optimization method, wherein the electric field strength inside the gradient insulating part represents the distortion condition of the internal electric field, and the electric field strength is a function of the dielectric constant and the conductivity and is influenced by the dielectric constant and the conductivity;
respectively calculating the optimal conductivity distribution of the spatial optimization target relative conductivity and the optimal dielectric constant distribution of the spatial optimization target relative dielectric constant according to the obtained spatial optimization target of the electric field intensity;
calculating a high-conductivity region in the conductivity optimal distribution, calculating a high-dielectric-constant region in the dielectric-constant optimal distribution, and taking the intersection of the high-conductivity region and the high-dielectric-constant region to obtain a high-dielectric region; calculating a uniform dielectric constant value and a uniform conductivity value of the high dielectric region according to the conductivity optimal distribution and the dielectric constant optimal distribution;
determining the addition amount of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value, and completing the preparation of the high dielectric part;
and fixing the high-dielectric part in a metal mold, and finishing the preparation of the residual low-insulation area of the insulation part by adopting a vacuum pouring method.
According to the preparation method of the gradient insulating component provided by the embodiment of the invention, the electric field intensity of the preset area of the gradient insulating component is reduced as an optimization target, and a space optimization target with common electric conductivity and dielectric constant in the gradient insulating component structure is calculated by adopting a topological optimization method; respectively calculating the optimal conductivity distribution of the relative conductivity of the space optimization target and the optimal dielectric constant distribution of the relative dielectric constant of the space optimization target according to the space optimization target; taking the intersection of the high-conductivity region in the conductivity optimal distribution and the high-dielectric-constant region in the dielectric-constant optimal distribution to obtain a high-dielectric region, and calculating the uniform dielectric constant value and the uniform conductivity value of the high-dielectric region; determining the addition amount of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value, and completing the preparation of the high dielectric part; and fixing the high-dielectric part in a metal mold, and finishing the preparation of the residual low-insulation area of the insulation part by adopting a vacuum pouring method. The precise control of the preparation of the gradient insulating component can be realized, and the insulating effect of the manufactured gradient insulating component is better.
In another embodiment provided by the present invention, the preset area specifically includes: a preset local area or a gas-solid interface of the gradient insulating part;
the step S1 specifically includes:
with the electric field intensity at the local area or the gas-solid interface reduced as an optimization target, solving a spatial optimization target f with common dielectric constant and conductivity in the gradient insulating part structure by adopting a level set algorithm in a topological optimization method;
wherein the content of the first and second substances,
omega is the calculation region of the electric field integral term of the gradient insulation part, omega1Designing the feasible region, Ω, for dielectric parameters2For a preset first optimization target region, Ω3For a preset second optimization target region, CrefIs a normalized parameter of an optimized component in an electric field integral term, r is an abscissa in a two-dimensional axisymmetric coordinate system, z is an ordinate in the two-dimensional axisymmetric coordinate system, E is an electric field intensity in the first optimization target areameanFor the average electric field strength within the second optimization target region, (r, z) ∈ Ω1；
The electric field strength of the space optimization target f with respect to the dielectric constant εriAnd electrical conductivity σriThe constraint conditions of (1) include:
wherein epsilonri、εmaxAnd εminRespectively designing feasible regions omega for the dielectric parameters1After the gridding, the dielectric constant in the ith grid, the upper limit of the change of the dielectric constant and the lower limit of the dielectric constant, sigmari、σmaxAnd σminRespectively the conductivity, the upper limit of the conductivity change and the lower limit of the conductivity in the ith grid, m is a control coefficient of the shape of a boundary curve, rhoiAnd A is the area size of the dielectric gradient region, which is the density in the ith grid.
In the specific implementation of this embodiment, the variable dielectric constant and the conductivity are designed as variables of the spatial optimization target, the electric field strength at the local region of the gradient insulating component or the gas-solid interface is reduced as the optimization target, and the level set algorithm in the topology optimization method is adopted to successively solve the spatial optimization target f common to the dielectric constant and the conductivity in the insulating structure.
Wherein the content of the first and second substances,
omega is the calculation region of the electric field integral term of the gradient insulation part, omega1Designing the feasible region, Ω, for dielectric parameters2For a preset first optimization target region, Ω3For a preset second optimization target region, CrefIs a normalized parameter of an optimized component in an electric field integral term, r is an abscissa in a two-dimensional axisymmetric coordinate system, z is an ordinate in the two-dimensional axisymmetric coordinate system, E is an electric field intensity in the first optimization target areameanFor the average electric field strength within the second optimization target region, (r, z) ∈ Ω1。
Further, the dielectric parameter is designed into a feasible region omega1Gridding is performed, and the electric field strength of the space optimization target f is related to the dielectric constant epsilonriAnd electrical conductivity σriThe constraint conditions of (1) include:
wherein epsilonri、εmaxAnd epsilonminThe dielectric constant, the upper limit of the change of the dielectric constant and the lower limit of the dielectric constant in the ith grid are respectively; sigmari、σmaxAnd σminConductivity, upper limit of conductivity change and lower limit of conductivity in the ith grid, respectively; m is a boundary curve shape control coefficient, rhoiAnd A is the area size of the dielectric gradient region, which is the density in the ith grid.
Through a level set algorithm in topological optimization, the region of the designed gradient insulating component is discretized, the internal structure of the gradient insulating component for inhibiting local electric field distortion can be rapidly optimized through establishing a mathematical model of conductivity, dielectric constant and an optimization target, and the precise control of the preparation of the gradient insulating component can be realized through the optimization target.
In another embodiment provided by the present invention, the step S2 specifically includes:
under the condition that the conductivity is kept unchanged, changing the distribution of the dielectric constant, and obtaining the dielectric constant optimized distribution according to the space optimization target;
on the basis of the obtained optimal dielectric constant optimal distribution, keeping the dielectric constant unchanged, changing the conductivity distribution, and obtaining the optimal conductivity optimal distribution according to the space optimization target;
optimizing the dielectric constant spatial distribution under the condition that the conductivity distribution is not changed; optimizing the spatial distribution of the conductivity on the basis of the dielectric constant distribution obtained by optimization; the optimal spatial distribution of dielectric constant and conductivity is obtained after the process is repeatedly executed for a plurality of times.
By adopting the iterative method of alternately optimizing the dielectric constant and the conductivity, the optimized gradient insulating component has more accurate insulating property, can adapt to working occasions under different voltage actions, is suitable for the dielectric constant gradient insulating component under the condition of alternating voltage and is suitable for the conductivity gradient insulating component under the condition of direct voltage.
In another embodiment provided by the present invention, the step S3 specifically includes:
taking a region with the conductivity larger than a first preset value in the conductivity optimal distribution as a high conductivity region;
taking a region with the dielectric constant larger than a second preset value in the optimal dielectric constant distribution as a high dielectric constant region;
taking intersection of the high conductivity region and the high dielectric constant region, and adopting small fillet transition to the discontinuous region of the boundary after taking intersection and the region with local tip to obtain the high dielectric region;
calculating an average value of the electrical conductivity in the high dielectric region as the uniform conductivity value according to the optimal distribution of the electrical conductivity;
and calculating the average value of the dielectric constant in the high dielectric region as the uniform dielectric constant value according to the optimal distribution of the dielectric constant.
In the specific implementation of this embodiment, a region in the optimal conductivity distribution, in which the conductivity is greater than a first preset value, is taken as a high conductivity region;
taking a region with the dielectric constant larger than a second preset value in the optimal dielectric constant distribution as a high dielectric constant region;
the first preset value can be preset to be a specific value of the conductivity exceeding 90% in the conductivity optimal distribution, and a region with the highest conductivity of 10% is selected as a high conductivity region through the first preset value;
the second preset value can be preset to be a specific value of the dielectric constant which exceeds 90% in the optimal distribution of the dielectric constant, and the region with the highest dielectric constant of 10% is selected as the high dielectric constant region through the second preset value;
it should be noted that the first preset value and the first preset value may also be a fixed value, and are used to select a high conductivity region and a high dielectric constant region;
and taking intersection of the high-conductivity region and the high-dielectric constant region, and performing small circular angle transition on a discontinuous region of the boundary after the intersection and a region with a local tip to obtain the high-dielectric region so as to ensure that no electric field distortion point exists in the high-dielectric region.
Calculating an average value of the electrical conductivity in the high dielectric region as the uniform conductivity value according to the optimal distribution of the electrical conductivity;
and calculating the average value of the dielectric constant in the high dielectric region as the uniform dielectric constant value according to the optimal distribution of the dielectric constant.
In another embodiment provided by the present invention, the step S4 specifically includes:
calculating a proportion of the filler based on the material property parameter of the filler, the material property parameter of the preparation material, the uniform dielectric constant value, and the uniform conductivity value;
adding the single-walled carbon nanotube with the surface hydroxyl modified as the filler into the preparation material according to the proportion to obtain composite slurry;
and (3) adopting photocuring 3D printing composite slurry to finish the preparation of the high-dielectric part.
In the specific implementation, the single-walled carbon nanotube with surface hydroxyl modified is used as a filler, and photosensitive resin is used as a preparation material;
calculating a proportion of the filler according to the material property parameter of the filler, the material property parameter of the preparation material, the uniform dielectric constant value and the uniform conductivity value, and changing the material property of the composite paste by changing the proportion of the filler in the composite paste, wherein the material property comprises: viscosity, curing depth in the printing process, dielectric constant of the molded material, conductivity of the molded material and tensile strength of the molded material;
table 1 is a table of the material properties of the composite slurry corresponding to fillers of different proportions by using surface hydroxyl modified single-walled carbon nanotubes as fillers and photosensitive resin as a preparation material:
table 1 table of material properties of different proportions of filler (surface hydroxyl modified single-walled carbon nanotubes) and composite slurry:
compared with the unmodified multi-wall carbon nanotube as the filler, the single-wall carbon nanotube modified by the surface hydroxyl has the advantages of lower composite slurry viscosity, higher composite slurry curing depth, wider dielectric constant and conductivity variation range and stronger tensile strength by using the single-wall carbon nanotube modified by the surface hydroxyl as the filler under the same mass fraction.
Table 2 is a table of material properties of composite slurries corresponding to fillers of different proportions, with unmodified single-walled carbon nanotubes as the filler, photosensitive resin as the preparation material:
table 2 table of material properties of different proportions of filler (unmodified single-walled carbon nanotubes) and composite slurry:
adding the single-walled carbon nanotube with the surface hydroxyl modified as the filler into the preparation material according to the proportion to obtain composite slurry;
and (3) adopting photocuring 3D printing composite slurry to finish the preparation of the high-dielectric part of the gradient insulating part.
And fixing the prepared high-dielectric part in a metal mold, and finishing the manufacture of the residual low-dielectric component of the insulating structure by adopting a vacuum pouring method to finish the manufacture of the gradient insulating component.
The surface hydroxyl modified single-walled carbon nanotube is used as the filler, so that on one hand, the dielectric constant and the conductivity of the material can be synchronously regulated, and on the other hand, the material has more excellent processing performance and material strength compared with other functional fillers. The 3D printing is adopted to prepare the high-dielectric part, on one hand, the rapid and high-precision production and manufacture of a complex optimized structure can be rapidly realized, and on the other hand, the polymer material has good compatibility with the polymer used for the supporting insulator and high interface bonding strength.
According to the preparation method of the gradient insulating component, the electric field intensity of a preset area of the gradient insulating component is reduced as an optimization target, and a space optimization target with common electric conductivity and dielectric constant in the gradient insulating component structure is calculated by adopting a topological optimization method; respectively calculating the optimal conductivity distribution of the relative conductivity of the space optimization target and the optimal dielectric constant distribution of the relative dielectric constant of the space optimization target according to the space optimization target; taking the intersection of the high-conductivity region in the conductivity optimal distribution and the high-dielectric-constant region in the dielectric-constant optimal distribution to obtain a high-dielectric region, and calculating the uniform dielectric constant value and the uniform conductivity value of the high-dielectric region; determining the addition amount of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value, and completing the preparation of the high dielectric part; and fixing the high-dielectric part in a metal mold, and finishing the preparation of the residual low-insulation area of the insulation part by adopting a vacuum pouring method. The level set algorithm in the topological optimization is adopted, the design area is discretized, the gradient insulation structure for inhibiting the local electric field distortion can be rapidly optimized by establishing the optimization target of the conductivity and the dielectric constant, and the optimized insulation structure can adapt to working occasions under different voltage effects by adopting the iterative method of the alternative optimization of the dielectric constant and the conductivity. The surface hydroxyl modified single-walled carbon nanotube is used as a filler, so that the dielectric constant and the conductivity of the material can be synchronously regulated and controlled, and the material has more excellent processing performance and material strength. The rapid and high-precision preparation of the gradient insulating part is realized. The preparation method of the gradient insulating component provided by the invention can realize the accurate control of the preparation of the gradient insulating component, and the prepared gradient insulating component has better insulating effect.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. A method of making a gradient insulation component, the method comprising:
taking reduction of electric field intensity of a preset area of a gradient insulating part as an optimization target, and calculating a space optimization target with common electric conductivity and dielectric constant in the gradient insulating part structure by adopting a topological optimization method;
respectively calculating the optimal conductivity distribution of the relative conductivity of the space optimization target and the optimal dielectric constant distribution of the relative dielectric constant of the space optimization target according to the space optimization target;
taking the intersection of the high-conductivity region in the conductivity optimal distribution and the high-dielectric-constant region in the dielectric-constant optimal distribution to obtain a high-dielectric region, and calculating the uniform dielectric constant value and the uniform conductivity value of the high-dielectric region;
determining the addition amount of the filler in the preparation material in the high dielectric region according to the uniform dielectric constant value and the uniform conductivity value, and completing the preparation of the high dielectric part;
and fixing the high-dielectric part in a metal mold, and finishing the preparation of the residual low-insulation area of the insulation part by adopting a vacuum pouring method.
2. The method for preparing a gradient insulating component according to claim 1, wherein the predetermined area comprises in particular: a preset local area or a gas-solid interface of the gradient insulating part;
the method for calculating the spatial optimization target of the common electric conductivity and dielectric constant in the gradient insulating part structure by using the topological optimization method and taking the electric field intensity of the preset area of the gradient insulating part as the optimization target specifically comprises the following steps
With the electric field intensity at the local area or the gas-solid interface reduced as an optimization target, solving a spatial optimization target f with common dielectric constant and conductivity in the gradient insulating part structure by adopting a level set algorithm in a topological optimization method;
wherein the content of the first and second substances,
omega is the calculation region of the electric field integral term of the gradient insulation part, omega1Designing the feasible region, Ω, for dielectric parameters2For a preset first optimization target region, Ω3For a preset second optimization target region, CrefIs a normalized parameter of an optimized component in an electric field integral term, r is an abscissa in a two-dimensional axisymmetric coordinate system, and z is a two-dimensional axisymmetric coordinate systemOrdinate under the system, E is the electric field intensity in the first optimization target area, EmeanFor the average electric field strength within the second optimization target region, (r, z) ∈ Ω1；
The electric field strength of the space optimization target f with respect to the dielectric constant εriAnd electrical conductivity σriThe constraint conditions of (1) include:
wherein epsilonri、εmaxAnd εminRespectively designing feasible regions omega for dielectric parameters1After the gridding, the dielectric constant in the ith grid, the upper limit of the change of the dielectric constant and the lower limit of the dielectric constant, sigmari、σmaxAnd σminRespectively the conductivity, the upper limit of the conductivity change and the lower limit of the conductivity in the ith grid, m is a control coefficient of the shape of a boundary curve, rhoiAnd A is the area size of the dielectric gradient region, which is the density in the ith grid.
3. The method for preparing a gradient insulating member according to claim 2, wherein the calculating the optimal distribution of the electrical conductivity of the spatially optimized target relative electrical conductivity and the optimal distribution of the dielectric constant of the spatially optimized target relative dielectric constant, respectively, according to the spatially optimized target, specifically comprises:
under the condition that the conductivity is kept unchanged, changing the distribution of the dielectric constant, and obtaining the dielectric constant optimized distribution according to the space optimization target;
on the basis of the obtained optimal dielectric constant optimal distribution, keeping the dielectric constant unchanged, changing the conductivity distribution, and obtaining the optimal conductivity optimal distribution according to the space optimization target;
according to the obtained optimal conductivity optimization distribution, keeping the conductivity constant, changing the distribution of the dielectric constant, according to the space optimization target, obtaining the optimal dielectric constant optimization distribution, on the basis of the obtained optimal dielectric constant optimization distribution, keeping the dielectric constant, changing the distribution of the conductivity, and according to the space optimization target, obtaining the optimal conductivity optimization distribution; and circularly acquiring the process preset times of the conductivity optimized distribution and the dielectric constant optimized distribution, taking the latest acquired conductivity optimized distribution as the conductivity optimal distribution, and taking the latest acquired dielectric constant optimized distribution as the dielectric constant optimal distribution.
4. The method for preparing a gradient insulating component according to claim 1, wherein the step of taking the intersection of the high conductivity region in the optimal conductivity distribution and the high permittivity region in the optimal permittivity distribution to obtain the high permittivity region and calculating the uniform permittivity and the uniform conductivity of the high permittivity region comprises the steps of:
taking a region with the conductivity larger than a first preset value in the conductivity optimal distribution as a high conductivity region;
taking a region with the dielectric constant larger than a second preset value in the optimal dielectric constant distribution as a high dielectric constant region;
taking intersection of the high conductivity region and the high dielectric constant region, and adopting small fillet transition to the discontinuous region of the boundary after taking intersection and the region with local tip to obtain the high dielectric region;
calculating an average value of the electrical conductivity in the high dielectric region as the uniform conductivity value according to the optimal distribution of the electrical conductivity;
and calculating the average value of the dielectric constant in the high dielectric region as the uniform dielectric constant value according to the optimal distribution of the dielectric constant.
5. The method of manufacturing a gradient insulating element according to claim 1, wherein said determining the proportion of filler in the preparation material in the high dielectric region according to the value of the uniform dielectric constant and the value of the uniform conductivity completes the preparation of the high dielectric portion, in particular comprising:
calculating a proportion of the filler based on the material property parameter of the filler, the material property parameter of the preparation material, the uniform dielectric constant value, and the uniform conductivity value;
adding the single-walled carbon nanotube with the surface hydroxyl modified as the filler into the preparation material according to the proportion to obtain composite slurry;
and (3) adopting photocuring 3D printing composite slurry to finish the preparation of the high-dielectric part.
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| CN116936009A (en) * | 2023-09-13 | 2023-10-24 | 国网山东省电力公司东营供电公司 | Electric field distribution regulation and control method and system for high-voltage insulating dielectric functionally-graded material |
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| CN116936009A (en) * | 2023-09-13 | 2023-10-24 | 国网山东省电力公司东营供电公司 | Electric field distribution regulation and control method and system for high-voltage insulating dielectric functionally-graded material |
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