Coating optimization method and device for surface coating of high-voltage electrode in GIS (Gas Insulated Switchgear) equipment

Abstract

The invention relates to a coating optimization method and device for a surface coating of a high-voltage electrode in GIS equipment. The method comprises the steps that a GIS model is manufactured according to the real size scaling of the GIS equipment; continuously pressurizing and electrifying the GIS model on which the coating samples with different thicknesses are placed until the coating samples are broken down; drawing a first insulation life curve corresponding to the GIS model; constructing a GIS electric field simulation calculation model; drawing a second insulation life curve of the GIS equipment; and coating optimization is carried out according to the second insulation life curve and the actual life demand. According to the method, through scaling model experiment and electric field intensity conversion, accurate prediction of the insulation life of the high-voltage electrode coating in the GIS equipment is realized; and meanwhile, on the basis of the Weibull distribution theory and MATLAB fitting, a correlation formula of the electrode coating insulation life and the surface electric field intensity under different thicknesses is obtained, so that the optimal laying scheme of the high-voltage electrode is optimized, and a guarantee is provided for the insulation stability of the GIS.

Description

Technical Field

[0001] The present application relates to the technical field of insulation detection of power equipment, and in particular to a method and device for optimizing the coating of the surface of high-voltage electrodes in GIS equipment. Background Art

[0002] GIS (Gas Insulated Switchgear) has been widely used in power engineering due to its strong anti-electromagnetic interference ability, large transmission capacity, and high operational stability. However, GIS equipment in actual projects currently has the risk of insulation failure, among which the metal particles moving inside the equipment are the key influencing factor causing insulation failure. GIS electrode coating is one of the effective measures to suppress metal particles, but due to the lack of research on the electrode coating installation scheme, the electrode coating is difficult to put into actual engineering application. Among them, the long-term service characteristics of the electrode coating are the key influencing factors whether the electrode coating can be put into actual engineering operation. At present, there is no insulation life prediction method for real GIS electrode coating, and due to factors such as the long time of real GIS electrode coating aging test and the large size of the equipment, it is difficult to carry out electrode coating aging test in real GIS. Therefore, there is an urgent need for a method that can optimize the surface coating of high-voltage electrodes in GIS equipment to optimize the electrode coating installation scheme. Summary of the Invention

[0003] To overcome the above-mentioned deficiencies of the prior art, the present application provides a method and device for optimizing the coating of the surface of high-voltage electrodes in GIS equipment, which specifically adopts the following technical solutions:

[0004] A method for optimizing the coating of a high-voltage electrode surface in GIS equipment, the method comprising the following steps:

[0005] Produce corresponding GIS models according to the actual size of GIS equipment;

[0006] Coating samples of different thicknesses were placed in the GIS model and continuously pressurized and energized until the coating samples broke down.

[0007] Calculate the insulation life of coating samples at different voltage levels and draw the first insulation life curve corresponding to the GIS model;

[0008] A GIS electric field simulation model was constructed to calculate the electric field intensity on the high-voltage electrode surface of the GIS equipment and the GIS model under the coating sample condition.

[0009] Obtaining a second insulation life curve of the GIS device according to the surface electric field strength of the high-voltage electrode of the GIS device and the GIS model and the first insulation life curve;

[0010] According to the second insulation life curve of the GIS device and the actual life requirement, a high-voltage electrode surface coating with a corresponding thickness is selected.

[0011] Optionally, when calculating the insulation life of the coating sample under different voltage levels, a one-dimensional two-parameter Weibull distribution function is used for calculation.

[0012] Optionally, the one-dimensional two-parameter Weibull distribution function includes a shape parameter and a scale parameter, and the shape parameter and the scale parameter are determined by a graphical method or a least square method.

[0013] Optionally, the step of constructing the GIS electric field simulation calculation model comprises:

[0014] Obtaining a geometric model of the GIS device or the GIS model, the geometric model adopts a coaxial cylindrical electrode geometric model, and the geometric model at least includes a high-voltage electrode and an outer shell;

[0015] Obtaining the high-voltage electrode radius and the outer shell radius of the GIS device or the GIS model based on the geometric model;

[0016] Setting the working condition boundary condition of the GIS device or the GIS model, the working condition boundary condition includes the effective value of the applied voltage of the GIS device or the GIS model;

[0017] According to the high-voltage electrode radius, the outer shell radius and the working condition boundary condition of the GIS device or the GIS model, a GIS electric field simulation calculation model is constructed.

[0018] Optionally, the step of obtaining the second insulation life curve of the GIS device according to the high-voltage electrode surface electric field intensity of the GIS device and the GIS model and the first insulation life curve comprises:

[0019] According to the GIS electric field simulation calculation model, the high-voltage electrode surface electric field intensity corresponding to different voltage levels in the first insulation life curve is calculated;

[0020] The different voltage levels in the first insulation life curve are replaced by the high-voltage electrode surface electric field intensity to form a first equivalent insulation life curve;

[0021] By formula fitting on the first equivalent insulation life curve, a correlation formula between the high-voltage electrode surface electric field intensity and the insulation life is obtained;

[0022] According to the GIS electric field simulation calculation model, the high-voltage electrode surface electric field intensity of the GIS device under different voltage levels is calculated;

[0023] Substituting the surface electric field strength of the high-voltage electrode of the GIS equipment at different voltage levels into the correlation formula, the insulation life of the surface coating of the high-voltage electrode in the GIS equipment at different voltage levels is obtained, that is, the second insulation life curve of the GIS equipment.

[0024] Optional: When fitting the first equivalent insulation life curve, use MATLAB software to fit the formula. The specific process includes:

[0025] Use the fit function or curve fitting toolbox of MATLAB software, and set the formula to be fitted to use an exponential function;

[0026] The least square method is used to optimize the fitting parameters of the exponential function so that the mean square error between the curve of the fitting formula and the first equivalent insulation life curve is minimized;

[0027] The fitting parameters with the smallest mean square error are selected and substituted into the fitting formula to obtain the correlation formula between the surface electric field strength of the high-voltage electrode and the insulation life.

[0028] Optional: This application is used for the method for optimizing the coating of the surface of high-voltage electrodes in GIS equipment, further comprising the steps of:

[0029] A motion model of metal particles coated with electrode was established, and the average motion height of metal particles was calculated to verify the effectiveness of electrode surface coating in suppressing metal particles.

[0030] Optionally, the electrode-coated metal particle motion model includes a geometric parameter model of the GIS equipment, a metal particle stress state model, a metal particle collision parameter model, and a GIS ground electrode surface coating structure model.

[0031] In addition, the present application also discloses a device for optimizing the coating of the surface of high-voltage electrodes in GIS equipment, the device comprising:

[0032] The scaled model acquisition module is used to produce the corresponding GIS model according to the actual size of the GIS equipment;

[0033] The coating pressure test module is used to place coating samples of different thicknesses into the GIS model and continuously apply pressure and electricity until the coating sample breaks down;

[0034] Model life calculation module, used to calculate the insulation life of coating samples under different voltage levels and draw the first insulation life curve corresponding to the GIS model;

[0035] The electric field simulation calculation module is used to build a GIS electric field simulation calculation model and calculate the electric field intensity of the high-voltage electrode surface of the GIS equipment and the GIS model under the condition of coating samples;

[0036] An equipment life equivalent calculation module is used to obtain a second insulation life curve of the GIS equipment based on the surface electric field strength of the high-voltage electrode of the GIS equipment and the GIS model and the first insulation life curve;

[0037] The coating selection module is used to select the high-voltage electrode surface coating of corresponding thickness according to the second insulation life curve of the GIS equipment and the actual life requirement.

[0038] Optional: The above-mentioned device for optimizing the coating of the surface of the high-voltage electrode in the GIS equipment may further include:

[0039] The model verification module is used to establish a motion model of electrode-coated metal particles and calculate the average motion height of the metal particles to verify the effectiveness of the electrode surface coating in suppressing the metal particles.

[0040] Beneficial effects

[0041] The technical solution of this application has the following beneficial effects:

[0042] The surface coating optimization method for high-voltage electrodes in GIS equipment disclosed in the present application solves the problems of long aging test cycle and large equipment volume of high-voltage electrode coatings in traditional GIS equipment through scaled model experiments and electric field strength conversion, and realizes accurate prediction of the insulation life of high-voltage electrode coatings in GIS equipment; at the same time, based on Weibull distribution theory and MATLAB fitting, the correlation formula between the insulation life of electrode coatings and surface electric field strength at different thicknesses is obtained, thereby selecting the optimal laying plan for high-voltage electrodes, providing guarantee for GIS insulation stability, and providing effective theoretical methods and technical paths for the engineering application and optimization modification of electrode coatings of similar high-voltage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a flow chart of the method for optimizing the surface coating of high-voltage electrodes in GIS equipment in an embodiment of the present application.

[0044] Figure 2 This is a graph showing the insulation life of the high-voltage electrodes of the GIS equipment in the embodiment of the present application using polyimide coatings of different thicknesses.

[0045] Figure 3 This is a diagram showing the simulation calculation results of the jumping height of metal particles after the high-voltage electrode of the GIS equipment is coated in an embodiment of the present application.

[0046] Figure 4 This is a structural diagram of the surface coating optimization device for high-voltage electrodes in GIS equipment in an embodiment of the present application.

[0047] Figure 5 This is a structural diagram of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The present application will be further described below in conjunction with the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application.

[0049] like Figure 1 As shown, this embodiment takes the coating of a high-voltage electrode with a polyimide surface coating as an example, and specifically discloses a method for optimizing the coating of a high-voltage electrode surface coating in GIS equipment, the method comprising the following steps:

[0050] First, make a scaled model based on the real GIS equipment:

[0051] In this embodiment, a corresponding GIS model can be produced at a certain scale according to the actual size of the GIS equipment. By producing the GIS model at a scale, the test cost and complexity can be reduced while ensuring a certain accuracy, providing a suitable test carrier for subsequent coating tests.

[0052] Then carry out the coating pressure test:

[0053] In this example, polyimide coating samples of varying thicknesses were placed within a GIS model and continuously pressurized and energized until the coating samples broke down. During this process, the electrical parameters applied to the GIS model were continuously monitored, and data such as the voltage and current at the time of breakdown were recorded to provide a basis for subsequent insulation life calculations. It should be noted that the optimization method of this example is applicable not only to polyimide coatings but can also be tested on coatings of other materials.

[0054] The model is then used to calculate the insulation life:

[0055] In this embodiment, the insulation life of the coating sample at different voltage levels is calculated to obtain a number of data points including voltage level-insulation life, and then the data points are connected into a smooth curve to obtain the first insulation life curve corresponding to the GIS model.

[0056] It should be noted that the insulation life of the coating sample in this embodiment refers to the duration from the start of pressurization to the breakdown of the sample. When calculating the insulation life of the coating sample at different voltage levels in this embodiment, a one-variable two-parameter Weibull distribution function is preferably used for calculation. Specifically, the one-variable two-parameter Weibull distribution function used in this embodiment is:

[0057]

[0058] Where F(t) is the failure probability of the coating sample at time t, where t>0; η is the insulation life of the coating sample; β is the shape parameter. Generally, when 0<β<1, the coating sample has more early failures; when β=1, the coating sample life is exponentially distributed; when β>1, the coating sample life distribution is unimodal.

[0059] Furthermore, the one-variable two-parameter Weibull distribution function described in this embodiment includes a shape parameter and a scale parameter, wherein the shape parameter and the scale parameter are determined by a graphical method or a least squares method. It should be noted that when the one-variable two-parameter Weibull distribution function is used to analyze the insulation life of the electrode surface coating in this embodiment, the parameters such as the electrical stress to which the coating material is generally subjected are fixed, and the independent variable and the dependent variable of the above function are the aging time and the failure probability, respectively. In order to analyze the influence of electrical stress on the insulation life, the maximum failure probability is set to 1 in this embodiment, and the independent variable and the dependent variable are set to the aging time and the electrical stress parameter, respectively, and then the one-variable two-parameter Weibull distribution function is used to obtain the life curve of the insulation life with respect to the electrical stress parameter. It should be noted that in this embodiment, when the insulation life failure probability is 1, it represents that the electrode surface coating is completely broken down, and the insulation failure life of the material is defined as the time taken for the electrode surface coating material to be completely broken down, that is, the time difference between the start of voltage application and the occurrence of breakdown.

[0060] Then perform electric field simulation calculation:

[0061] It should be noted that the electric field strength calculated in this example is a key physical quantity that directly affects the aging of electrode surface coating materials. Generally, regardless of GIS device size, when the electric field strength on the electrode coating surface remains constant, the electrical stress mechanism experienced by the metal particles within remains consistent. Therefore, by converting voltage to electric field strength, this example allows experimental results (such as insulation life characteristics) from a scaled-down GIS model to be directly correlated with the actual operating conditions of the GIS device, avoiding the issue of voltage parameter incomparability due to differences in device size.

[0062] Specifically, this embodiment constructs a GIS electric field simulation calculation model to calculate the electric field strength on the surface of the high-voltage electrode of the GIS device and the GIS model under the condition of coating sample coating.

[0063] The specific steps of constructing the GIS electric field simulation calculation model include:

[0064] First, a geometric model of the GIS device or the GIS model is obtained. In this embodiment, the geometric model adopts a coaxial cylindrical electrode geometric model, and the geometric model includes at least a high-voltage electrode and a housing.

[0065] Then, based on the geometric model, a high-voltage electrode radius and a housing radius of the GIS device or the GIS model are obtained;

[0066] Then, the operating boundary conditions of the GIS device or the GIS model are set, and the operating boundary conditions include the effective value of the applied voltage of the GIS device or the GIS model. It should be noted that, in this embodiment, the operating boundary conditions of the GIS model can be obtained by querying the recorded data in the coating pressure test, and the operating boundary conditions of the GIS device can be set as the quantity to be determined.

[0067] According to the high-voltage electrode radius, the shell radius and the working boundary conditions of the GIS equipment or the GIS model, a GIS electric field simulation calculation model is constructed.

[0068] This embodiment uses the GIS electric field simulation calculation model to calculate the electric field intensity on the high-voltage electrode surface of the GIS model:

[0069]

[0070] Among them E 缩 is the electric field intensity of the high-voltage electrode surface of the GIS model; U ac is the effective value of the voltage applied to the GIS model; R a is the radius of the high voltage electrode in the GIS model; R b is the GIS model shell radius.

[0071] This example uses the GIS electric field simulation model to calculate the electric field strength on the surface of the high-voltage electrode of the GIS equipment:

[0072]

[0073] Among them E 真 is the electric field strength on the surface of the high-voltage electrode of the GIS equipment; U AC is the effective value of the voltage applied to the GIS equipment; R A is the radius of the high-voltage electrode in the GIS equipment; R B is the outer shell radius of the GIS equipment.

[0074] Since the electric stress mechanism borne by the internal metal particles is consistent when the electric field strength on the surface of the electrode coating is the same, this embodiment converts the voltage applied to the GIS device or the GIS model into electric field strength through the above-mentioned GIS electric field simulation calculation model. Although the actual applied voltage of the GIS model is different from that of the GIS device, the electric field strength of the two can be calculated respectively through geometric parameters (radius) and voltage, thereby converting the voltage parameters under different working conditions into the same physical quantity (electric field strength) to achieve cross-scale equivalence.

[0075] Then perform the equipment life equivalent calculation:

[0076] This embodiment can obtain a second insulation life curve for the GIS device based on the surface electric field strength of the high-voltage electrode of the GIS device and the GIS model, as well as the first insulation life curve. Specifically, the steps for obtaining the second insulation life curve for the GIS device in this embodiment include:

[0077] (1) Calculating the electric field strength of the high-voltage electrode surface corresponding to different voltage levels in the first insulation life curve according to the GIS electric field simulation calculation model;

[0078] (2) replacing different voltage levels in the first insulation life curve with the electric field strength on the surface of the high-voltage electrode to form a first equivalent insulation life curve;

[0079] (3) Using the fit function or curve fitting toolbox of MATLAB software to perform formula fitting on the first equivalent insulation life curve, and obtain a correlation formula between the surface electric field strength of the high-voltage electrode and the insulation life; wherein in this embodiment, when performing formula fitting on the first equivalent insulation life curve, preferably using MATLAB software for formula fitting, the specific process includes:

[0080] Use the fit function or curve fitting toolbox of MATLAB software, and set the formula to be fitted to use an exponential function;

[0081] The least square method is used to optimize the fitting parameters of the exponential function so that the mean square error between the curve of the fitting formula and the first equivalent insulation life curve is minimized;

[0082] The fitting parameters with the smallest mean square error are selected and substituted into the fitting formula to obtain the correlation formula between the surface electric field strength of the high-voltage electrode and the insulation life.

[0083] This embodiment uses the fit function of MATLAB software for fitting as an example, and the correlation formula between the surface electric field strength of the high-voltage electrode and the insulation life can be obtained:

[0084] L = A × e B×Eb ;

[0085] Where L is the insulation life of the electrode film, A and B are fitting constants, where B < 0, E b is the electric field intensity on the surface of the high-voltage electrode coating.

[0086] (4) The electric field strength of the high-voltage electrode surface of the GIS equipment at different voltage levels is calculated based on the GIS electric field simulation calculation model. For actual GIS equipment, the corresponding applied voltage can be converted into electric field strength using the GIS electric field simulation calculation model. Then, the electric field strength is substituted into the above correlation formula to obtain the corresponding electrode coating insulation life.

[0087] (5) Substituting the electric field strength of the high-voltage electrode surface of the GIS equipment at different voltage levels into the correlation formula, the insulation life of the high-voltage electrode surface coating in the GIS equipment at different voltage levels is obtained, that is, the second insulation life curve of the GIS equipment. For example, in this embodiment, the electric field strength E of the actual GIS equipment is calculated by the GIS electric field simulation calculation model. 真 , then you can substitute the following formula:

[0088]

[0089] Since A and B in the above formula are fixed fitting constants, the actual electric field strength E of the GIS equipment can be obtained. 真 The actual electrode film insulation life L 真 .

[0090] In this embodiment, the electric field strength on the surface of the high-voltage electrode corresponding to different voltage levels of the GIS device can be calculated, and then the corresponding electrode coating insulation life of the actual GIS device under different voltage levels can be obtained by substituting the above-mentioned correlation formula between the electric field strength on the surface of the high-voltage electrode and the insulation life.

[0091] Finally, by performing curve fitting on the electrode coating insulation life corresponding to different voltage levels of GIS equipment, the second insulation life curve of the corresponding GIS equipment can be obtained.

[0092] Finally, the coating is optimized:

[0093] In this embodiment, a high-voltage electrode surface coating of corresponding thickness is selected based on the second insulation life curve of the GIS equipment under the corresponding coating and the actual life requirement.

[0094] In addition, the method for optimizing the coating of the high-voltage electrode surface in GIS equipment of this embodiment also includes an effect verification step, the specific contents of which include:

[0095] A motion model for metal particles coated with an electrode film was established, and the average particle height was calculated to verify the effectiveness of the electrode surface coating in suppressing metal particles. The model included a model of the geometric parameters of the GIS device, a model of the force applied to the metal particles, a model of the metal particle collision parameters, and a model of the GIS electrode surface coating structure. This model theoretically verified the coating's ability to suppress metal particles, providing a more comprehensive basis for coating optimization.

[0096] The stress state model of the metal particles can be expressed as:

[0097]

[0098] G is the gravity of the metal particle itself, g is the acceleration of gravity, m is the mass of the particle, F E F is the electric field force on the particle, q is the charge of the metal particle, E is the electric field intensity at the position of the particle, F f F is the gas resistance of the moving metal particle, r is the radius of the particle, v is the speed of the particle, η is the gas resistance coefficient, F grad F is the electric field gradient force, F adhe W is the adhesion force of the electrode coating film on the metal particle, W a W is the adhesion work between the two materials, Δa is the depth of the particle sinking into the coating film.

[0099] The metal particle collision parameter model is represented as:

[0100]

[0101] In the above formula, v represents the particle collision incident speed, θ0 represents the metal particle collision incident angle, sigma is the standard deviation, mu is the mean value, log nrnd represents a function of generating a lognormal distribution random number, and θ represents the random collision reflection angle of the metal particle.

[0102] Based on the electrode coating metal particle motion model, the maximum motion height and the average motion height of the internal metal particles in the GIS device after the high-voltage electrode coating film can be obtained. In this embodiment, the average motion height of the metal particles is used as an important basis for evaluating the effectiveness of the optimized electrode coating particle suppression. The average motion height of the metal particles can be represented as:

[0103]

[0104] In the above formula, h is the average motion height of the metal particle, h i hi is the particle motion height at time i, and n is the average scale of the particle motion time.

[0105] The embodiment can determine whether the electrode coating film suppresses the motion height of the metal particles according to the calculation result of the average motion height of the metal particles. For example, as shown in Figure 2 The embodiment obtains the insulation life curve by coating different thicknesses of polyimide coating films on the high-voltage electrodes in the GIS device and through GIS electrode coating insulation life prediction. It is found that the polyimide electrode coating film with a thickness of 100 μm laid in a certain type of GIS device can meet the long-term service requirements of the real GIS project, and as Figure 3As shown, the embodiment compares the take-off height of metal particles of different sizes before and after coating, finds that it can effectively inhibit metal particles and ensure the insulation stability of GIS, and based on the result, the optimal coating scheme for the surface coating of high-voltage electrodes in GIS equipment can be proposed.

[0106] In addition, as Figure 4 As shown, the application also discloses a device for coating optimization of the surface coating of high-voltage electrodes in GIS equipment, which comprises:

[0107] The scaled-down model acquisition module is configured to make a corresponding GIS model according to the real size of the GIS equipment;

[0108] The coating pressure test module is configured to place coating samples of different thicknesses into the GIS model and continuously pressurize and power until the coating samples are broken down;

[0109] The model life calculation module is configured to calculate the insulation life of the coating samples under different voltage levels and draw a first insulation life curve of the corresponding GIS model;

[0110] The electric field simulation calculation module is configured to construct a GIS electric field simulation calculation model and calculate the electric field intensity of the high-voltage electrode surface of the GIS equipment and the GIS model under the condition of coating the coating samples, respectively;

[0111] The device life equivalent calculation module is configured to obtain a second insulation life curve of the GIS equipment according to the electric field intensity of the high-voltage electrode surface of the GIS equipment and the GIS model and the first insulation life curve;

[0112] The coating selection module is configured to select a high-voltage electrode surface coating of a corresponding thickness according to the second insulation life curve of the GIS equipment and the actual life requirement.

[0113] Further, the above-mentioned device for coating optimization of the surface coating of high-voltage electrodes in GIS equipment further comprises:

[0114] The model verification module is configured to establish an electrode coating metal particle motion model, calculate the average motion height of the metal particles, and verify the effectiveness of the electrode surface coating in inhibiting the metal particles.

[0115] The device provided by the embodiment of the application can realize Figure 1 The processes realized by the method embodiment are not repeated here to avoid repetition.

[0116] As Figure 5 As shown, the embodiment of the application also provides an electronic device comprising a processor and a memory, a program or instructions stored on the memory and executable on the processor, and the program or instructions are executed by the processor to realize the method as Figure 1The various processes of the method embodiment shown in the figure can achieve the same technical effect. To avoid repetition, they will not be described here.

[0117] The embodiment of the present application also provides a readable storage medium on which a program or instruction is stored, and when the program or instruction is executed by the processor, the above Figure 1 The various processes of the method embodiments described above can achieve the same technical effects, and will not be described again here to avoid repetition.

[0118] The present application also provides a computer program product including computer instructions, which, when executed by a processor, implement the above Figure 1 The various processes of the method embodiments described above can achieve the same technical effects, and will not be described again here to avoid repetition.

[0119] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments.

[0120] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0121] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another device, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0122] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0123] In addition, all functional units in the embodiments of the present application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the above-mentioned integrated units can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0124] Those skilled in the art will understand that all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM), magnetic disks or optical disks, and other media that can store program codes.

[0125] Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a device (which can be a terminal or platform, etc.) to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROMs, magnetic disks or optical disks.

[0126] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for optimizing the coating of high-voltage electrode surfaces in GIS equipment, characterized in that: The method comprises the following steps: Produce corresponding GIS models according to the actual size of GIS equipment; Coating samples of different thicknesses were placed in the GIS model and continuously pressurized and energized until the coating samples broke down. Calculate the insulation life of coating samples at different voltage levels and draw the first insulation life curve corresponding to the GIS model; A GIS electric field simulation model was constructed to calculate the electric field intensity on the high-voltage electrode surface of the GIS equipment and the GIS model under the coating sample condition. Obtaining a second insulation life curve of the GIS device according to the surface electric field strength of the high-voltage electrode of the GIS device and the GIS model and the first insulation life curve; According to the second insulation life curve of GIS equipment and the actual life requirement, the high-voltage electrode surface coating with corresponding thickness is selected.

2. The method for optimizing the surface coating of high-voltage electrodes in GIS equipment according to claim 1, characterized in that: When calculating the insulation life of coating samples at different voltage levels, the one-variable two-parameter Weibull distribution function is used for calculation.

3. The method for optimizing the surface coating of high-voltage electrodes in GIS equipment according to claim 2, characterized in that: The one-variable two-parameter Weibull distribution function includes a shape parameter and a scale parameter, and the shape parameter and the scale parameter are determined by a graphical method or a least squares method.

4. The method for optimizing the coating of the surface of high-voltage electrodes in GIS equipment according to claim 1, characterized in that: The steps of constructing the GIS electric field simulation calculation model include: Obtaining a geometric model of the GIS device or the GIS model, wherein the geometric model adopts a coaxial cylindrical electrode geometric model and the geometric model includes at least a high-voltage electrode and a housing; Obtaining a high-voltage electrode radius and a housing radius of the GIS device or the GIS model based on the geometric model; Setting an operating boundary condition of the GIS device or the GIS model, wherein the operating boundary condition includes an effective value of an applied voltage of the GIS device or the GIS model; According to the high-voltage electrode radius, the shell radius and the working boundary conditions of the GIS equipment or the GIS model, a GIS electric field simulation calculation model is constructed.

5. The method for optimizing the coating of the surface of high-voltage electrodes in GIS equipment according to claim 1, characterized in that: The step of obtaining a second insulation life curve of the GIS device according to the surface electric field strength of the high-voltage electrode of the GIS device and the GIS model and the first insulation life curve fitting comprises: Calculate the electric field strength of the high-voltage electrode surface corresponding to different voltage levels in the first insulation life curve according to the GIS electric field simulation calculation model; The different voltage levels in the first insulation life curve are replaced by the electric field strength on the surface of the high-voltage electrode to form a first equivalent insulation life curve; By fitting the first equivalent insulation life curve, a correlation formula between the surface electric field strength of the high-voltage electrode and the insulation life is obtained; Calculate the electric field strength on the surface of the high-voltage electrodes of GIS equipment at different voltage levels based on the GIS electric field simulation calculation model; Substituting the surface electric field strength of the high-voltage electrode of the GIS equipment at different voltage levels into the correlation formula, the insulation life of the surface coating of the high-voltage electrode in the GIS equipment at different voltage levels is obtained, that is, the second insulation life curve of the GIS equipment.

6. The method for optimizing the surface coating of high-voltage electrodes in GIS equipment according to claim 5, characterized in that: When fitting the first equivalent insulation life curve, MATLAB software is used for formula fitting. The specific process includes: Use the fit function or curve fitting toolbox of MATLAB software, and set the formula to be fitted to use an exponential function; The least square method is used to optimize the fitting parameters of the exponential function so that the mean square error between the curve of the fitting formula and the first equivalent insulation life curve is minimized; The fitting parameters with the smallest mean square error are selected and substituted into the fitting formula to obtain the correlation formula between the surface electric field strength of the high-voltage electrode and the insulation life.

7. The method for optimizing the coating of the surface of high-voltage electrodes in GIS equipment according to claim 1, characterized in that: The method further comprises: A motion model of metal particles coated with electrode was established, and the average motion height of metal particles was calculated to verify the effectiveness of electrode surface coating in suppressing metal particles.

8. The method for optimizing the surface coating of high-voltage electrodes in GIS equipment according to claim 7, characterized in that: The electrode coating metal particle motion model includes a GIS equipment geometric parameter model, a metal particle stress state model, a metal particle collision parameter model, and a GIS ground electrode surface coating structure model.

9. A device for optimizing the surface coating of high-voltage electrodes in GIS equipment, characterized in that: The device comprises: The scaled model acquisition module is used to produce the corresponding GIS model according to the actual size of the GIS equipment; The coating pressure test module is used to place coating samples of different thicknesses into the GIS model and continuously apply pressure and electricity until the coating sample breaks down; Model life calculation module, used to calculate the insulation life of coating samples under different voltage levels and draw the first insulation life curve corresponding to the GIS model; The electric field simulation calculation module is used to build a GIS electric field simulation calculation model and calculate the electric field intensity of the high-voltage electrode surface of the GIS equipment and the GIS model under the condition of coating samples; An equipment life equivalent calculation module is used to obtain a second insulation life curve of the GIS equipment based on the surface electric field strength of the high-voltage electrode of the GIS equipment and the GIS model and the first insulation life curve; The coating selection module is used to select the high-voltage electrode surface coating of corresponding thickness according to the second insulation life curve of the GIS equipment and the actual life requirement.

10. The device for optimizing the surface coating of high-voltage electrodes in GIS equipment according to claim 9, characterized in that: The device further comprises: The model verification module is used to establish a motion model of electrode-coated metal particles and calculate the average motion height of the metal particles to verify the effectiveness of the electrode surface coating in suppressing the metal particles.

Images