Design method, device and system for anti-aging composite insulator in hot and humid areas

Abstract

The invention relates to the technical field of high-voltage power transmission equipment, in particular to a design method, device and system for an anti-aging composite insulator in a hot and humid area. The large umbrella diameter, the umbrella skirt spacing and the umbrella skirt dip angle are determined through the umbrella skirt structure design step, the core rod structure material, the glass fiber volume fraction and the core rod waterproof coating total thickness are determined through the core rod structure design step, and the hardware fitting base material and surface treatment, the ceramic layer total thickness and the bowl head thickness are determined through the hardware fitting structure design step. The length of the long axis and the length of the short axis of the elliptical ring are determined through the grading ring structure design step, and finally performance verification is conducted on the designed anti-aging composite insulator according to the preset acceptance standard so that it can be guaranteed that the designed anti-aging composite insulator can not appear in the humid and hot environment. The problems of rapid umbrella skirt aging, core rod water tree development, severe hardware fitting corrosion and grading ring electric field distortion are solved.

Description

Technical Field

[0001] This application relates to the field of high-voltage power transmission equipment technology, specifically to a design method, device, and system for anti-aging composite insulators in humid and hot regions. Background Technology

[0002] Hot and humid regions often exhibit climatic characteristics such as high temperature, high humidity, and even high salt spray, leading to severe corrosion and aging. For various equipment installed on high-voltage transmission lines in open-air environments in hot and humid regions, improving their resistance to corrosion and wind loads while ensuring the electrical performance of the lines themselves presents a significant challenge.

[0003] Composite insulators are widely used in high-voltage transmission lines due to their advantages such as light weight, excellent resistance to flashover, and convenient installation. However, in hot and humid regions, their long-term operation faces severe aging challenges. The core issues are concentrated in four main structures: sheds, core rods, fittings, and grading rings. Currently, composite insulators installed in hot and humid regions often suffer from problems such as rapid aging of sheds, water treeing in the core rods, severe corrosion of fittings, and electric field distortion in the grading rings due to inadequate consideration of climatic conditions in material selection, surface treatment methods, and shape design. Summary of the Invention

[0004] The purpose of this application is to provide a design method, device, and system for anti-aging composite insulators in humid and hot regions, in order to solve the problems of rapid aging of the sheds, water tree development in the core rod, severe corrosion of the fittings, and electric field distortion of the equalizing ring in composite insulators designed in the prior art.

[0005] To achieve the above objectives, the first aspect of this application provides a design method for anti-aging composite insulators in humid and hot regions, comprising: The umbrella skirt structure design steps are as follows: Determine the large umbrella diameter D1 based on the rated voltage U and the average relative humidity H during the first preset time period; determine the umbrella skirt spacing L based on the large umbrella diameter D1 and the average rainfall R during the first preset time period; determine the umbrella skirt tilt angle θ based on the maximum wind speed V and the windward projected area S of a single umbrella during the second preset time period. The mandrel structure design steps are as follows: Bisphenol F type epoxy resin and alkali-free glass fiber substrate are selected as the mandrel structure materials. The volume fraction of glass fiber is determined based on the target bending strength σ and the average maximum temperature T during the first preset time period. The total thickness δ of the waterproof coating on the mandrel is determined based on the average relative humidity H and expected lifespan t within the first preset time period. The hardware structure design steps are as follows: Stainless steel is selected as the base material, and a transition layer and a ceramic layer are prepared on the surface, with a bowl-shaped structure. The total thickness of the ceramic layer is determined based on the corrosion rate v, salt spray concentration s, and expected lifespan t. rThe thickness of the bowl head is determined based on the maximum wind load F, the inner diameter d of the bowl head, and the yield strength of the steel. Design steps for the equalizing ring structure: The equalizing ring structure adopts an elliptical ring structure. The length of the major axis A of the elliptical ring is determined according to the maximum electric field strength, rated voltage U and electric field correction coefficient k; the length of the minor axis B of the elliptical ring is determined according to the maximum wind speed V in the second preset time period and the length of the major axis A of the elliptical ring. According to the preset acceptance criteria, the designed anti-aging composite insulators shall be subjected to at least the damp heat aging test, salt spray test, and wind load test to ensure that the designed anti-aging composite insulators meet the acceptance criteria.

[0006] In this embodiment, the large umbrella diameter D1, the skirt spacing L, and the skirt tilt angle θ are determined according to the following formulas: D1 = (0.8 × U + 50) × [1 + 0.005 × (H)] 80)] L = 0.2 × D1 × [1 + 0.001 × (R)] 1500)] θ = arctan(0.05 × V / S) Wherein, U is the rated voltage, H is the average relative humidity H during the first preset time period, R is the average rainfall during the first preset time period, V is the maximum wind speed during the second preset time period, and S is the windward projected area of ​​a single umbrella.

[0007] In the embodiments of this application, the volume fraction of glass fiber is determined according to the following formulas. Total thickness δ of waterproof coating on core rod: =60%+(σ 300) / 500+0.2%×(T 30) δ=150+5×(H 80)+10×(t 15) Where σ is the target bending strength, T is the average maximum temperature during the first preset time period, H is the average relative humidity during the first preset time period, and t is the expected lifespan.

[0008] In the embodiments of this application, the total thickness δ of the ceramic layer is determined according to the following formula. cer With the thickness δ of the bowl met : δ cer =v×t×(1+0.1×s) δ met =F×103 / (π×d×σ s ×0.8) Where, δcer Let v be the total thickness of the ceramic layer, v be the corrosion rate of the ceramic layer, t be the expected lifetime, s be the salt spray concentration, and δ be the total thickness of the ceramic layer. met Where is the thickness of the bowl head, F is the maximum wind load, d is the inner diameter of the bowl head, and σ is the inner diameter of the bowl head. s This refers to the yield strength of the steel.

[0009] In this embodiment, the major axis length A and minor axis length B of the elliptical ring are determined according to the following formulas: A = U × 10 / (2 × π × Emax × k) B=A×[1 0.005×(V 30)] Where A is the major axis length of the elliptical ring, U is the rated voltage, Emax is the maximum electric field strength, k is the electric field correction coefficient, B is the minor axis length of the elliptical ring, and V is the maximum wind speed within the second preset time period.

[0010] In this embodiment of the application, the umbrella skirt structure design step further includes: The modified silicone rubber composite material prepared according to the first mass fraction ratio was selected as the umbrella skirt material.

[0011] In this embodiment of the application, the mandrel structure design step further includes: The outer surface of the mandrel is sandblasted and coated with epoxy adhesive.

[0012] The second aspect of this application provides a design device for anti-aging composite insulators in humid and hot regions, comprising: The umbrella skirt structure design module is used to determine the large umbrella diameter D1 based on the rated voltage U and the average relative humidity H within the first preset time period; to determine the umbrella skirt spacing L based on the large umbrella diameter D1 and the average rainfall R within the first preset time period; and to determine the umbrella skirt tilt angle θ based on the maximum wind speed V and the windward projected area S of a single umbrella within the second preset time period. The mandrel structure design module is used to select bisphenol F type epoxy resin and alkali-free glass fiber substrate as mandrel structure materials. The glass fiber volume fraction is determined based on the target bending strength σ and the average maximum temperature T within a first preset time period. The total thickness δ of the waterproof coating on the mandrel is determined based on the expected lifespan t. The fitting structure design module is used for the following fitting structure design steps: 2507 super duplex stainless steel is selected as the base material, and a transition layer and a ceramic layer are prepared on the surface, and a bowl-shaped structure is formed. The total thickness of the ceramic layer is determined according to the corrosion rate and salt spray concentration of the ceramic layer; the thickness of the bowl-shaped structure is determined according to the maximum wind load F, the inner diameter d of the bowl-shaped structure, and the yield strength of the steel. The equalizing ring structure design module is used to determine the major axis length A of the elliptical ring structure based on the maximum electric field strength, rated voltage U, and electric field correction coefficient k; and to determine the minor axis length B of the elliptical ring based on the maximum wind speed V and the major axis length A of the elliptical ring during the second preset time period. The verification module is used to conduct at least three tests on the designed anti-aging composite insulators, namely, damp heat aging resistance test, salt spray resistance test, and wind load test, according to the preset acceptance criteria, to ensure that the designed anti-aging composite insulators meet the acceptance criteria.

[0013] A third aspect of this application provides a design system for anti-aging composite insulators in humid and hot regions, comprising: The memory is configured to store instructions; A processor configured to retrieve the instructions from the memory and, when executing the instructions, to implement a design method for anti-aging composite insulators in humid and hot regions.

[0014] A fourth aspect of this application provides a machine-readable storage medium storing instructions for causing a machine to perform a design method for anti-aging composite insulators in humid and hot regions.

[0015] Through the above technical solutions, this application determines the large umbrella diameter, umbrella skirt spacing, and umbrella skirt inclination angle by utilizing the umbrella skirt structure design steps, and determines the core rod structure material and glass fiber volume fraction by utilizing the core rod structure design steps. The total thickness δ of the waterproof coating on the mandrel is determined using the fitting structure design steps, including the fitting substrate, surface treatment, and total ceramic layer thickness δ. cer δ of the bowl head met The design process utilizes the equalizing ring structure design steps to determine the major axis length A and minor axis length B of the elliptical ring. Finally, the performance of the designed anti-aging composite insulator is verified according to preset acceptance standards to ensure that the designed anti-aging composite insulator does not exhibit problems such as rapid aging of the sheds, water tree development in the core rod, severe corrosion of the fittings, and electric field distortion of the equalizing ring.

[0016] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings: Figure 1 The illustration shows a flowchart of a design method for an anti-aging composite insulator in a humid and hot region according to an embodiment of this application; Figure 2The schematic diagram illustrates the structure of an anti-aging composite insulator for humid and hot regions according to an embodiment of this application.

[0018] Figure 3 The illustration shows a schematic cross-sectional view of an anti-aging composite insulator for humid and hot regions according to an embodiment of this application.

[0019] Figure 4 This illustration schematically shows a design device for an anti-aging composite insulator in humid and hot regions according to an embodiment of this application; Figure 5 The schematic diagram illustrates the structure of a design system for an anti-aging composite insulator in humid and hot regions according to an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0021] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0022] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0024] Figure 1 The illustration schematically shows a flow chart of a design method for an anti-aging composite insulator in humid and hot regions according to an embodiment of this application. Figure 1 As shown in the embodiment of this application, a design method for anti-aging composite insulators in humid and hot regions is provided, which may include the following steps.

[0025] Step 110, umbrella skirt structure design steps: Determine the large umbrella diameter D1 based on the rated voltage U and the average relative humidity H within the first preset time period; determine the umbrella skirt spacing L based on the large umbrella diameter D1 and the average rainfall R within the first preset time period; determine the umbrella skirt tilt angle θ based on the maximum wind speed V and the windward projected area S of a single umbrella within the second preset time period.

[0026] Insulator sheds are an important component of insulators in power systems. Their main functions are to improve insulation performance, prevent flashover, and enhance rain protection. Please refer to the following: Figure 2 , Figure 2 The diagram illustrates the structure of an anti-aging composite insulator for humid and hot regions according to an embodiment of this application. Figure 2 As shown, the umbrella skirt is divided into a large umbrella skirt and a small umbrella skirt, with a gap between the umbrella skirts and a tilt angle at the edges of the umbrella skirts. In the embodiments of this application, the structure of the umbrella skirt is designed separately in three aspects: the diameter of the large umbrella, the gap between the umbrella skirts, and the tilt angle of the umbrella skirts.

[0027] The diameter of the insulator umbrella has a significant impact on the shielding effect and the effective creepage distance. The risk of conductivity caused by relative humidity making the insulator surface moist must also be considered. Therefore, in this embodiment, the diameter of the insulator umbrella is determined by the following formula: D1 = (0.8 × U + 50) × [1 + 0.005 × (H)] 80)] Wherein, D1 is the diameter of the large umbrella, U is the rated voltage, and H is the average relative humidity H within the first preset time period. In one optional embodiment of this application, the diameter of the large umbrella can range from 200mm to 320mm; the rated voltage can range from 110kV to 1000kV; the annual average relative humidity can range from 85% to 95%; and the average relative humidity within the first preset time period can be the annual average relative humidity.

[0028] The spacing between the umbrella skirts primarily affects the effective creepage distance, local electric field distribution, and ventilation and drying capacity. Therefore, the design must consider the multiple impacts of the large umbrella, including rainwater runoff during precipitation, air circulation due to the shading effect, and uneven local electric field distribution, while also taking into account the varying drainage requirements resulting from different average rainfall amounts within a first preset time period. Therefore, in this embodiment, the spacing between the umbrella skirts is determined using the following formula: L = 0.2 × D1 × [1 + 0.001 × (R)] 1500)] Wherein, L is the umbrella skirt spacing, D1 is the large umbrella diameter, and R is the average rainfall within the first preset time period. In one optional embodiment of this application, the average rainfall within the first preset time period can be the annual average precipitation, ranging from 1500mm to 2500mm; the umbrella skirt spacing can be between 40mm and 60mm.

[0029] The angle of the umbrella skirt largely determines its drainage and self-cleaning capabilities, but the influence of the skirt's shape on its mechanical strength must also be considered. Local wind speed should be taken into account when determining the angle of the umbrella skirt. The formula for determining the angle of the umbrella skirt is as follows: θ = arctan(0.05 × V / S) Where θ is the umbrella skirt tilt angle, V is the maximum wind speed within the second preset time period, and S is the windward projected area of ​​a single umbrella. In one optional embodiment of this application, the maximum wind speed within the second preset time period can be the local maximum wind speed over 10 minutes, ranging from 40 m / s to 50 m / s; the umbrella skirt tilt angle can be from 10° to 12°.

[0030] In this embodiment, the material for the umbrella skirt can be a modified silicone rubber composite material prepared according to a first mass fraction ratio. An optional implementation may be as follows: 75% to 85% base silicone rubber to maintain the substrate's flexibility; 5% to 7% nano-titanium dioxide to absorb ultraviolet light with wavelengths of 280nm to 400nm, and synergistically with nano-zinc oxide to enhance UV resistance and slow aging; 3% to 4% hindered phenolic antioxidants to capture free radicals and delay oxidation at higher temperatures in humid and hot regions; 2% to 3% nano-zinc oxide to inhibit mold growth in high-humidity environments; 10% to 12% fumed silica to improve mechanical strength; and 2% to 3% hydroxyl silicone oil to ensure the umbrella skirt's hardness remains stable at 60 to 65 degrees.

[0031] By determining the structure and materials of the umbrella skirt, an umbrella skirt with good insulation performance, excellent anti-fouling ability, and strong wind and rain resistance can be designed.

[0032] Step 120, Mandrel Structure Design Steps: Bisphenol F type epoxy resin and alkali-free glass fiber substrate are selected as mandrel structure materials. The glass fiber volume fraction is determined based on the target bending strength σ and the average maximum temperature T within the first preset time period. The total thickness δ of the waterproof coating on the mandrel is determined based on the average relative humidity H and expected lifespan t within the first preset time period.

[0033] Please refer to the following: Figure 3 , Figure 3 A schematic cross-sectional view of an anti-aging composite insulator for humid and hot regions according to an embodiment of this application is shown. It is understood that the core rod in the composite insulator, as the main load-bearing component, needs to provide fixation for the sheath and fittings and withstand various loads. In this embodiment, the core rod uses bisphenol F epoxy resin, which is more resistant to high temperatures, and alkali-free glass fiber substrate as the core rod structural materials. Therefore, the alkali-free glass fiber substrate bears the main mechanical load, and its volume fraction has a significant impact on the overall mechanical properties of the core rod. Temperature also affects the performance of bisphenol F epoxy resin, and therefore needs to be considered. In this embodiment, the glass fiber volume fraction is determined using the following formula: =60%+(σ 300) / 500+0.2%×(T 30) in, σ represents the glass fiber volume fraction, σ represents the target flexural strength, and T represents the average maximum temperature within a first preset time period. In one optional embodiment of this application, the average maximum temperature within the first preset time period can be the annual average maximum temperature, ranging from 35°C to 45°C; the target flexural strength increases with the increase of the average maximum temperature within the first preset time period to compensate for the decrease in mechanical strength at high temperatures, and can be a flexural strength at 40°C of not less than 330 MPa. The value range can be 70% to 75%. Preferably, the diameter of the alkali-free glass fiber can be 8μm to obtain better interfacial bonding. Winding process parameters with a winding angle between ±58° and ±60° can be used to reduce axial stress. A winding tension between 65N and 70N (fluctuation ≤5N) can be used to avoid fiber relaxation. Vacuum degassing treatment at -0.095MPa can be performed every 3 layers to ensure an internal bubble rate of ≤0.1% in the mandrel, reducing the starting point for water tree formation. Curing at 140℃ for 3.5h can ensure complete cross-linking of the epoxy resin, resulting in a volume resistivity ≥5×10⁻⁶. 15 Ω cm.

[0034] In this embodiment, the mandrel needs to be protected from hydrolysis of the alkali-free glass fiber by a waterproof coating composed of a polyimide layer and a fluorocarbon layer to prevent strength loss or even breakage. Therefore, the total thickness δ of the waterproof coating of the mandrel needs to be determined based on the average relative humidity H and expected lifespan t within a first preset time period according to the following formula: δ=150+5×(H 80)+10×(t 15) Where δ represents the total thickness of the waterproof coating on the mandrel, H represents the average relative humidity H during the first preset time period, and t represents the expected lifespan. In one optional implementation, the average relative humidity during the first preset time period can be an annual average relative humidity ranging from 85% to 95%; the expected lifespan can be at least 20 years; and the total thickness of the waterproof coating on the mandrel can be 200 μm to 300 μm (including a 150 μm to 200 μm polyimide layer and a 50 μm to 100 μm fluorocarbon layer).

[0035] Preferably, in the embodiments of this application, the outer surface of the mandrel may be sandblasted with a roughness Ra between 4.5 μm and 6.0 μm, and may be coated with an epoxy adhesive with a thickness between 70 μm and 90 μm to improve aging resistance.

[0036] Step 130, Fitting Structure Design Steps: Stainless steel is selected as the base material, and a transition layer and a ceramic layer are prepared on the surface, with a bowl-shaped structure. The total thickness of the ceramic layer is determined based on the ceramic layer corrosion rate v, salt spray concentration s, and expected lifespan t. rThe thickness of the bowl head is determined based on the maximum wind load F, the inner diameter d of the bowl head, and the yield strength of the steel.

[0037] Fittings are the connecting components of insulators. In the embodiments of this application, the fittings use stainless steel as the base material, and a transition layer and a ceramic layer are prepared on the surface to reduce corrosion, extend service life, and reduce the effects of thermal expansion. An optional embodiment uses 2507 super duplex stainless steel with a composition of 25% Cr, 7% Ni, and 4% Mo, and prepares a 70μm to 90μm thick NiCr transition layer and a 140μm to 160μm thick Al2O3-ZrO2-Y2O3 ceramic layer on the stainless steel surface. Specifically, the total thickness of the ceramic layer can be determined according to the following formula: δ cer =v×t×(1+0.1×s) Where, δ cer Let v be the total thickness of the ceramic layer, v be the corrosion rate of the ceramic layer, t be the expected lifetime, and s be the salt spray concentration. In one optional embodiment, the total thickness of the ceramic layer can range from 200 μm to 250 μm, the corrosion rate of the ceramic layer can be 0.5 μm / year, and the salt spray concentration can be from 5 mg / m³ to 15 mg / m³.

[0038] The thickness of the insulator head, as a crucial component of the insulator connection, directly determines the structural strength and wind resistance. Therefore, its wall thickness must be determined based on the maximum wind load, the inner diameter of the insulator head, and the yield strength of the selected steel, using the following formula: δ met =F×103 / (π×d×σ s ×0.8) Where, δ met Where is the thickness of the bowl head, F is the maximum wind load, d is the inner diameter of the bowl head, and σ is the inner diameter of the bowl head. s The yield strength of the steel is used. Preferably, when the yield strength of the 2507 stainless steel used for the bowl head is 450 MPa, the thickness of the bowl head can range from 14 mm to 18 mm.

[0039] Furthermore, the mandrel head can be designed with a three-layer seal: an inner nitrile rubber sealing ring with a compression ratio of 25%~30% provides initial sealing; a middle layer of water-swellable rubber strip with an expansion ratio of ≥300% ensures that moisture can still be blocked even if the outer layer fails; and an outer layer of epoxy sealant with a shear strength of ≥12MPa is used. Ultimately, this can achieve a sealing reliability of 99.5%, with no moisture intrusion at the mandrel-fitting interface.

[0040] By determining the hardware design, the physical installation and mechanical stability of the insulators can be ensured, and the safety and reliability of the entire transmission line can be improved through electrical optimization.

[0041] Step 140, Equalizing Ring Structure Design Steps: The equalizing ring structure adopts an elliptical ring structure. The major axis length A of the elliptical ring is determined according to the maximum electric field strength, rated voltage U and electric field correction coefficient k; the minor axis length B of the elliptical ring is determined according to the maximum wind speed V in the second preset time period and the major axis length A of the elliptical ring.

[0042] An equalizing ring is a metal ring device installed at both ends of an insulator string. Its main function is to improve the electric field distribution around the insulator string, thereby enhancing insulation performance and operational reliability. In this embodiment, due to the asymmetry of the electric field direction, an elliptical structure is selected for the equalizing ring. To suppress corona discharge, the major axis length A of the elliptical ring needs to be determined based on the maximum electric field strength, rated voltage U, and electric field correction coefficient k, as shown in the following formula: A = U × 10 / (2 × π × Emax × k) Where A is the major axis length of the elliptical ring, U is the rated voltage, Emax is the maximum electric field strength, and k is the electric field correction factor. In one possible embodiment, when the maximum electric field strength is less than 17 kV / cm and the electric field correction factor is 0.8, the major axis length of the elliptical ring can range from 400 mm to 1000 mm.

[0043] To prevent structural damage to the elliptical ring under strong winds, after determining the length of the major axis of the elliptical ring, the length of the minor axis can be determined using the following formula: B=A×[1 0.005×(V 30)] Where B is the minor axis length of the elliptical ring, and V is the maximum wind speed within the second preset time period. Preferably, when the maximum wind speed within the second preset time period is the local maximum wind speed over 10 minutes and its value ranges from 40 m / s to 50 m / s, the minor axis length of the elliptical ring can be from 350 mm to 900 mm.

[0044] Preferably, the substrate of the equalizing ring can be made of 6082 aluminum alloy to ensure better tensile strength at high temperature. The surface can be formed with a 50μm thick Al2O3 oxide film by a micro-arc oxidation process with an electrolyte of 8% sodium silicate-sodium hydroxide system, an oxidation voltage of 380V and a time of 45min.

[0045] Step 150: In accordance with the preset acceptance standards, the designed anti-aging composite insulator shall be subjected to at least the damp heat aging test, salt spray test, and wind load test to ensure that the designed anti-aging composite insulator meets the acceptance standards.

[0046] Each structure of the anti-aging composite insulator designed through steps 110 to 140 needs to undergo actual testing to ensure that the design specifications match the actual specifications. In this embodiment, the designed anti-aging composite insulator needs to undergo at least damp heat aging resistance testing, salt spray resistance testing, and wind load testing to ensure that the designed anti-aging composite insulator meets the acceptance criteria.

[0047] This application solves the problems of rapid aging of umbrella skirts, water tree development in core rods, severe corrosion of fittings, and electric field distortion of equalizing rings in existing composite insulator designs by using umbrella skirt structure design steps, determining the large umbrella diameter, umbrella skirt spacing, and umbrella skirt inclination angle, using core rod structure design steps, determining the core rod structure material, glass fiber volume fraction, and total thickness of the core rod waterproof coating, using fitting structure design steps, determining the fitting substrate and surface treatment, total thickness of ceramic layer, and cup head thickness, using fitting structure design steps, and determining the major axis length and minor axis length of elliptical rings, and finally verifying the performance of the designed anti-aging composite insulator according to preset acceptance standards.

[0048] Figure 4 This illustration schematically shows a design device for an anti-aging composite insulator in humid and hot regions according to an embodiment of this application. Figure 4 As shown in the embodiments of this application, the design device 400 for anti-aging composite insulators in humid and hot regions comprises: The umbrella skirt structure design module 410 is used to determine the large umbrella diameter D1 based on the rated voltage U and the average relative humidity H within the first preset time period; to determine the umbrella skirt spacing L based on the large umbrella diameter D1 and the average rainfall R within the first preset time period; and to determine the umbrella skirt tilt angle θ based on the maximum wind speed V and the windward projected area S of a single umbrella within the second preset time period. The mandrel structure design module 420 is used to select bisphenol F type epoxy resin and alkali-free glass fiber substrate as mandrel structure materials. The glass fiber volume fraction is determined based on the target bending strength σ and the average maximum temperature T within a first preset time period. The total thickness δ of the waterproof coating on the mandrel is determined based on the expected lifespan t. The fitting structure design module 430 is used for the following fitting structure design steps: 2507 super duplex stainless steel is selected as the base material, and a transition layer and a ceramic layer are prepared on the surface, and a bowl-shaped structure is provided. The total thickness of the ceramic layer is determined based on the corrosion rate and salt spray concentration of the ceramic layer; the thickness of the bowl-shaped structure is determined based on the maximum wind load F, the inner diameter d of the bowl-shaped structure, and the yield strength of the steel. The equalizing ring structure design module 440 is used to determine the major axis length A of the elliptical ring based on the maximum electric field strength, rated voltage U, and electric field correction coefficient k; and to determine the minor axis length B of the elliptical ring based on the maximum wind speed V and the major axis length A of the elliptical ring during the second preset time period. The verification module 450 is used to conduct at least a damp heat aging test, a salt spray test, and a wind load test on the designed anti-aging composite insulator according to the preset acceptance criteria, to ensure that the designed anti-aging composite insulator meets the acceptance criteria.

[0049] Figure 5 This illustration schematically shows a structural diagram of a design system for an anti-aging composite insulator in humid and hot regions according to an embodiment of this application. Figure 5 As shown in the embodiment of this application, a design system 500 for anti-aging composite insulators in humid and hot regions is provided, which may include: Memory 510 is configured to store instructions; The processor 520 is configured to retrieve instructions from the memory 510 and, when executing the instructions, to implement the aforementioned design method for anti-aging composite insulators in humid and hot regions.

[0050] This application also provides a machine-readable storage medium storing instructions that cause a machine to execute the above-described design method for anti-aging composite insulators in humid and hot regions.

[0051] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0052] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0053] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0054] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0055] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0056] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0057] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0058] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0059] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A design method for anti-aging composite insulators in hot and humid regions, characterized in that, include: The umbrella skirt structure design steps are as follows: Determine the large umbrella diameter D1 based on the rated voltage U and the average relative humidity H during the first preset time period; determine the umbrella skirt spacing L based on the large umbrella diameter D1 and the average rainfall R during the first preset time period; determine the umbrella skirt tilt angle θ based on the maximum wind speed V and the windward projected area S of a single umbrella during the second preset time period. The mandrel structure design steps are as follows: Bisphenol F type epoxy resin and alkali-free glass fiber substrate are selected as the mandrel structure materials. The glass fiber volume fraction is determined according to the target bending strength σ and the average maximum temperature T during the first preset time period. The total thickness δ of the waterproof coating on the mandrel is determined based on the average relative humidity H and expected lifespan t during the first preset time period. The design steps for the fitting structure are as follows: Stainless steel is selected as the base material, and a transition layer and a ceramic layer are prepared on the surface. It has a bowl-shaped structure. The total thickness of the ceramic layer is determined according to the corrosion rate v, salt spray concentration s, and expected life t of the ceramic layer. The thickness of the bowl-shaped structure is determined according to the maximum wind load F, the inner diameter d of the bowl-shaped structure, and the yield strength of the steel. The design steps of the equalizing ring structure are as follows: The equalizing ring structure adopts an elliptical ring structure. The length of the major axis A of the elliptical ring is determined according to the maximum electric field strength, the rated voltage U and the electric field correction coefficient k; the length of the minor axis B of the elliptical ring is determined according to the maximum wind speed V in the second preset time period and the length of the major axis A of the elliptical ring. According to the preset acceptance criteria, the designed anti-aging composite insulator shall be subjected to at least the damp heat aging resistance test, salt spray resistance test, and wind load test to ensure that the designed anti-aging composite insulator meets the aforementioned acceptance criteria.

2. The design method according to claim 1, characterized in that, The diameter D1 of the large umbrella, the spacing L of the umbrella skirts, and the inclination angle θ of the umbrella skirts are determined according to the following formulas: D1=(0.8×U+50)×[1+0.005×(H 80)] L=0.2×D1×[1+0.001×(R 1500)] θ = arctan(0.05 × V / S) Wherein, U is the rated voltage, H is the average relative humidity H during the first preset time period, R is the average rainfall during the first preset time period, V is the maximum wind speed during the second preset time period, and S is the windward projected area of ​​the single umbrella.

3. The design method according to claim 1, characterized in that, The volume fraction of glass fiber is determined according to the following formulas. And the total thickness δ of the waterproof coating on the mandrel: =60%+(σ 300) / 500+0.2%×(T 30) δ=150+5×(H 80)+10×(t 15) Wherein, σ is the target bending strength, T is the average maximum temperature during the first preset time period, H is the average relative humidity during the first preset time period, and t is the expected lifespan.

4. The design method according to claim 1, characterized in that, The total thickness of the ceramic layer and the thickness of the bowl head are determined according to the following formulas: d cer =v×t×(1+0.1×s) d met =F×103 / (π×d×σ) s ×0.8) Where, δ cer The total thickness of the ceramic layer, v is the corrosion rate of the ceramic layer, t is the expected lifetime, s is the salt spray concentration, and δ is the total thickness of the ceramic layer. met Where is the thickness of the bowl head, F is the maximum wind load, d is the inner diameter of the bowl head, and σ is the maximum wind load. s The yield strength of the steel is given.

5. The design method according to claim 1, characterized in that, The major axis length A and the minor axis length B of the elliptical ring are determined according to the following formulas: A = U × 10 / (2 × π × Emax × k) B=A×[1 0.005×(V 30)] Where A is the major axis length of the elliptical ring, U is the rated voltage, Emax is the maximum electric field strength, k is the electric field correction coefficient, B is the minor axis length of the elliptical ring, and V is the maximum wind speed within the second preset time period.

6. The design method according to claim 1, characterized in that, The umbrella skirt structure design steps also include: The modified silicone rubber composite material prepared according to the first mass fraction ratio is selected as the material of the umbrella skirt.

7. The design method according to claim 1, characterized in that, The mandrel structure design steps also include: The outer surface of the mandrel is sandblasted and coated with epoxy adhesive.

8. A design device for anti-aging composite insulators in hot and humid regions, characterized in that, include: The umbrella skirt structure design module is used to determine the large umbrella diameter D1 based on the rated voltage U and the average relative humidity H within a first preset time period; to determine the umbrella skirt spacing L based on the large umbrella diameter D1 and the average rainfall R within the first preset time period; and to determine the umbrella skirt tilt angle θ based on the maximum wind speed V within a second preset time period and the windward projected area S of a single umbrella. The mandrel structure design module is used to select bisphenol F type epoxy resin and alkali-free glass fiber substrate as mandrel structure materials. The glass fiber volume fraction is determined based on the target bending strength σ and the average maximum temperature T within a first preset time period. The total thickness δ of the waterproof coating on the mandrel is determined based on the expected lifespan t. The fitting structure design module is used for the following fitting structure design steps: 2507 super duplex stainless steel is selected as the base material, and a transition layer and a ceramic layer are prepared on the surface, and a bowl-shaped structure is formed. The total thickness of the ceramic layer is determined according to the corrosion rate and salt spray concentration of the ceramic layer; the thickness of the bowl-shaped structure is determined according to the maximum wind load F, the inner diameter d of the bowl-shaped structure, and the yield strength of the steel. The equalizing ring structure design module is used to determine the major axis length A of the elliptical ring structure based on the maximum electric field strength, rated voltage U, and electric field correction coefficient k; and to determine the minor axis length B of the elliptical ring based on the maximum wind speed V and the major axis length A of the elliptical ring during the second preset time period. The verification module is used to conduct at least three tests on the designed anti-aging composite insulators, namely, damp heat aging resistance test, salt spray resistance test, and wind load test, according to the preset acceptance criteria, to ensure that the designed anti-aging composite insulators meet the acceptance criteria.

9. A design system for anti-aging composite insulators in hot and humid regions, characterized in that, include: The memory is configured to store instructions; A processor is configured to retrieve the instructions from the memory and, when executing the instructions, to implement the design method for anti-aging composite insulators in humid and hot regions according to any one of claims 1 to 7.

10. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to perform the design method for anti-aging composite insulators in humid and hot regions according to any one of claims 1 to 7.

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