An umbrella type design method and system of a composite casing for high altitude

Abstract

The application discloses a kind of umbrella type design method and system of composite bushing for high altitude, it is related to the structural design of power equipment, wherein the method comprises: determining the application environment parameter of composite insulator;Based on the application environment parameter, the basic parameter of composite insulator is determined;Combining with use environment parameter and basic parameter, the umbrella type structure parameter of the composite insulator is determined;The composite insulator with umbrella type structure parameter is verified by test, and the umbrella type structure parameter of the composite insulator is iteratively optimized according to the verification result, until meeting the test requirement.The umbrella type design method and system of composite bushing for high altitude provided by the application determine the umbrella type structure parameter based on the application environment parameter, so that the designed composite insulator can accurately adapt to high altitude special working conditions, and ensure the stability of equipment operation.

Description

Technical Field

[0001] This invention relates to the field of structural design technology for power equipment, and more specifically, to a method and system for umbrella-shaped design of composite bushings for high-altitude applications. Background Technology

[0002] With strong national support for the construction of ultra-high voltage (UHV) power transmission projects, a large number of UHV power transmission projects will be built in the future, and more and more UHV power transmission projects will inevitably pass through high-altitude areas.

[0003] Numerous studies have shown that the umbrella-shaped structure has a significant impact on the flashover characteristics of insulators. A reasonable umbrella-shaped structure can significantly improve the flashover voltage of insulators, enhancing their pollution withstand voltage level without increasing the insulator's structural height, thus meeting the requirements for use at higher altitudes and in more polluted conditions. Currently, GB / T 26218.3-2011 "Selection and Size Determination of High-Voltage Insulators for Use Under Polluted Conditions" provides a range of parameters for insulator umbrella-shaped structures. However, these research findings and standard specifications are mainly applicable to plain areas below 1000m altitude.

[0004] Currently, research on the relationship between AC flashover characteristics of large-diameter composite bushings at high altitudes and umbrella-shaped structural parameters has not been conducted, and it is impossible to provide an optimized umbrella-shaped structure to improve the flashover voltage of composite bushings. Summary of the Invention

[0005] This invention proposes a method and system for designing the umbrella shape of a composite sleeve for high-altitude applications, in order to solve the problem of how to design the umbrella shape of a composite sleeve for high-altitude applications.

[0006] To address the aforementioned problems, according to one aspect of the present invention, a method for designing an umbrella-shaped composite sleeve for high-altitude applications is provided, the method comprising: Determine the application environment parameters for composite insulators; Based on the application environment parameters, the basic parameters of the composite insulator are determined; Based on the environmental parameters and the basic parameters, the umbrella-shaped structural parameters of the composite insulator are determined. The composite insulator with the aforementioned umbrella-shaped structural parameters was tested and verified. Based on the verification results, the umbrella-shaped structural parameters of the composite insulator were iteratively optimized until the test requirements were met.

[0007] Preferably, the application environment parameters include: altitude parameters, pollution level parameters, and meteorological condition parameters; the meteorological condition parameters include wind speed, precipitation intensity, and icing thickness. The basic parameters include: insulation distance and structural height; the insulation distance is determined based on the electrical clearance requirements at high altitudes, and the structural height is adapted to the overall installation space requirements of the composite bushing.

[0008] Preferably, the umbrella structure parameters include: creepage coefficient value, umbrella spacing, umbrella extension amount, number of umbrella skirts, and electric field homogenization structure at the end region; The creepage coefficient value is determined based on the altitude parameter, and the creepage coefficient value ranges from 3.5 to 4.3. Based on the pollution level parameters and the altitude parameters, the withstand voltage between the umbrellas and the withstand voltage along the umbrella surface of the composite insulator are calculated by simulation to determine the degree of arc bridging between the umbrellas. Based on the degree of arc bridging between the umbrellas, the umbrella spacing and the umbrella extension amount are obtained. The number of umbrella skirts is calculated by dividing the total withstand voltage requirement of the composite insulator by the rated withstand voltage of a single umbrella structure. The electric field at the end region is homogenized.

[0009] The electric field homogenization structure at the end region is achieved by setting up an equalizing ring.

[0010] Preferably, the determination of the umbrella-shaped structure parameters is based on the arc-bridging performance as the core evaluation index, and the electric field distribution characteristics as the auxiliary optimization index.

[0011] Preferably, it further includes: The degree of arc bridging between umbrellas is determined based on the effect of salt density on the electric arc.

[0012] Based on another aspect of the present invention, the present invention provides an umbrella-shaped design system for a composite sleeve used at high altitudes, characterized in that the system comprises: An initial unit is used to determine the application environment parameters of the composite insulator; based on the application environment parameters, the basic parameters of the composite insulator are determined. The determining unit is used to determine the umbrella-shaped structure parameters of the composite insulator by combining the environmental parameters and the basic parameters. The execution unit is used to test and verify the composite insulator with the umbrella-shaped structure parameters, and iteratively optimize the umbrella-shaped structure parameters of the composite insulator according to the verification results until the test requirements are met.

[0013] Preferably, the application environment parameters include: altitude parameters, pollution level parameters, and meteorological condition parameters; the meteorological condition parameters include wind speed, precipitation intensity, and icing thickness. The basic parameters include: insulation distance and structural height; the insulation distance is determined based on the electrical clearance requirements at high altitudes, and the structural height is adapted to the overall installation space requirements of the composite bushing.

[0014] Preferably, the umbrella structure parameters include: creepage coefficient value, umbrella spacing, umbrella extension amount, number of umbrella skirts, and electric field homogenization structure at the end region; The creepage coefficient value is determined based on the altitude parameter, and the creepage coefficient value ranges from 3.5 to 4.3. Based on the pollution level parameters and the altitude parameters, the withstand voltage between the umbrellas and the withstand voltage along the umbrella surface of the composite insulator are calculated by simulation to determine the degree of arc bridging between the umbrellas. Based on the degree of arc bridging between the umbrellas, the umbrella spacing and the umbrella extension amount are obtained. The number of umbrella skirts is calculated by dividing the total withstand voltage requirement of the composite insulator by the rated withstand voltage of a single umbrella structure. The electric field at the end region is homogenized.

[0015] The electric field homogenization structure at the end region is achieved by setting up an equalizing ring.

[0016] Preferably, the determination of the umbrella-shaped structure parameters is based on the arc-bridging performance as the core evaluation index, and the electric field distribution characteristics as the auxiliary optimization index.

[0017] Preferably, it further includes: The degree of arc bridging between umbrellas is determined based on the effect of salt density on the electric arc.

[0018] This invention provides a method and system for designing the umbrella-shaped structure of composite bushings for high-altitude applications. The method includes: determining the application environment parameters of the composite insulator; determining the basic parameters of the composite insulator based on the application environment parameters; determining the umbrella-shaped structural parameters of the composite insulator by combining the application environment parameters and the basic parameters; conducting experimental verification on the composite insulator with the umbrella-shaped structural parameters; and iteratively optimizing the umbrella-shaped structural parameters of the composite insulator based on the verification results until the experimental requirements are met. This invention aims to rationally control the structural height and structural parameters of composite bushings in high-altitude areas, designing an umbrella-shaped structure for AC composite bushings at high altitudes. This significantly improves the flashover voltage without increasing the insulation distance of the composite bushing, thereby enhancing the engineering application value of the composite insulator. Attached Figure Description

[0019] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures: Figure 1 This is a flowchart of an umbrella-shaped design method for a composite sleeve for high altitude applications according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a typical composite insulator umbrella structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the composite insulator parameters (s, p, l) according to an embodiment of the present invention; Figure 4 A flowchart illustrating the umbrella-shaped design method for a composite sleeve according to an embodiment of the present invention; and Figure 5 This is a structural diagram of an umbrella-shaped design system for a composite sleeve used at high altitudes according to an embodiment of the present invention. Detailed Implementation

[0020] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0021] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0022] Figure 1 This is a flowchart illustrating an umbrella-shaped design method for a composite sleeve used at high altitudes according to an embodiment of the present invention.

[0023] Currently, there is no corresponding design method for composite insulators at high altitudes, mainly because: (1) Lack of applicability. The current standard for the design requirements of composite insulator umbrella type is mainly based on the operating environment in plain areas, and is not applicable to the design requirements in high-altitude environments; (2) The pollution withstand voltage characteristics of composite insulators are closely related to multiple factors. Numerous studies have shown that the pollution withstand voltage characteristics of composite insulators are related to factors such as insulator umbrella type, altitude, and pollution level. Currently, there is a lack of design methods for composite bushing umbrella types in high-altitude environments. (3) Effectiveness verification methods. Whether the umbrella design of the composite insulator is reasonable requires a large number of verification tests. The verification methods are complex and the workload is extremely large.

[0024] To address the aforementioned shortcomings of existing technologies, this invention aims to solve the lack of a basis for the umbrella design of composite insulators used in high-altitude areas. This invention proposes a method and system for designing the umbrella shape of composite insulators in high-altitude areas. By conducting pollution withstand voltage characteristic tests on composite insulators at different altitudes, the relationship between the umbrella shape and pollution withstand voltage of composite insulators at different altitudes is analyzed, providing a design basis for the umbrella design of composite insulators in high-altitude areas.

[0025] The purpose of this invention is to address the lack of a basis for the current umbrella-type design method of composite insulators at high altitudes, and to solve the problem of a significant decrease in the pollution withstand voltage performance of composite insulators at high altitudes. The method and system described in this invention can make the umbrella-type design of composite insulators more reliable, and at the same time improve the pollution withstand voltage performance of composite insulators in high-altitude areas.

[0026] Based on numerous artificial pollution tests, the optimal structure of composite insulator skirt diameter, inclination angle, and spacing was obtained, and the optimal airflow path between the skirts was ensured under different environments such as pollution, humidity, and high altitude, resulting in a significant improvement in flashover voltage.

[0027] The content of this invention is as follows: (1) The arc bridging performance as a method for evaluating the quality of umbrella-shaped structures Composite insulators operate in complex environments. With changes in the operating environment, under the operating voltage, arc development can be broadly categorized into three forms: surface development, stable bridging, and cross-connection. Stable bridging and cross-connection can be collectively referred to as bridging. The form of arc development between umbrellas affects its flashover voltage. A higher probability of arc bridging between umbrellas results in a smaller flashover gradient and lower leakage distance utilization. At high altitudes, arc development is even more complex; therefore, the design of the umbrella structure must consider blocking the arc development path.

[0028] (2) By comparing the development process of electric arc, reasonable parameters for umbrella spacing, umbrella extension and large and small umbrella structure are proposed.

[0029] If the flashover distance is the same, the arc will develop along the shortest air gap, the total shortest air gap, or the surface with the weakest insulation strength. Therefore, considering the operating environment of the composite bushing, the local insulation performance of umbrella-shaped composite bushings with different structural parameters is analyzed and compared, and the optimal umbrella-shaped structural parameters are given.

[0030] (3) Electric field distribution characteristics as an auxiliary indicator for umbrella structure design Numerous simulation results show that the electric field distribution is uneven in different parts of the composite insulator during actual operation, especially at the high and low voltage ends. Therefore, special structural designs are needed at the high and low voltage ends of the composite insulator and bushing to balance the electric field distribution.

[0031] By analyzing and comparing a large number of flashover test results of composite sleeves with different umbrella-shaped structures, a design method for composite sleeve umbrella-shaped structures at high altitudes can be proposed.

[0032] like Figure 1 As shown, this invention provides a method for designing an umbrella-shaped composite sleeve for high-altitude applications, characterized in that the method includes: Step 101: Determine the application environment parameters of the composite insulator; This invention determines the application environment of the composite sleeve and obtains its operating environment characteristics, such as altitude H, pollution level, and local meteorological conditions.

[0033] Step 102: Determine the basic parameters of the composite insulator based on the application environment parameters; Preferably, the application environment parameters include: altitude parameters, pollution level parameters, and meteorological condition parameters; the meteorological condition parameters include wind speed, precipitation intensity, and icing thickness. The basic parameters include: insulation distance and structural height; the insulation distance is determined based on the electrical clearance requirements at high altitudes, and the structural height is adapted to the overall installation space requirements of the composite bushing.

[0034] This invention preliminarily determines the insulation distance and structural height of the composite and bushing. Based on the altitude and pollution level of the application site, the insulation distance and structural height of the composite and bushing are determined using conventional calculation methods. Figure 2 As shown.

[0035] Step 103: Combine the environmental parameters and basic parameters to determine the umbrella-shaped structural parameters of the composite insulator; Preferably, the umbrella structure parameters include: creepage coefficient value, umbrella spacing, umbrella extension amount, number of umbrella skirts, and electric field homogenization structure at the end region; The creepage coefficient value is determined based on the altitude parameter, and the creepage coefficient value ranges from 3.5 to 4.3. Based on the pollution level parameters and altitude parameters, the withstand voltage between the umbrellas and the withstand voltage along the umbrella surface of the composite insulator are calculated by simulation to determine the degree of arc bridging between the umbrellas, and the umbrella spacing and umbrella extension are obtained based on the degree of arc bridging between the umbrellas. The number of umbrella skirts is calculated by dividing the total withstand voltage requirement of the composite insulator by the rated withstand voltage of a single umbrella structure. The electric field at the end region is homogenized.

[0036] The electric field homogenization structure at the end region is achieved by setting up an equalizing ring.

[0037] Preferably, the parameters of the umbrella structure are determined with the arc-blocking bridging performance as the core evaluation index and the electric field distribution characteristics as the auxiliary optimization index.

[0038] Preferably, it further includes: The degree of arc bridging between umbrellas is determined based on the effect of salt density on the electric arc.

[0039] This invention defines the umbrella-shaped structure of the composite and sleeve. The umbrella-shaped structure and related parameters of the composite and sleeve are as follows: Figure 3 As shown in the figure. Where s is the umbrella spacing; p is the umbrella extension; and l is the distance along the surface.

[0040] In actual operation, contaminant particles from nature can deposit on the surface of composite insulation equipment. When the environment is dry, its insulation performance is strong and usually does not cause flashover. However, when the ambient humidity reaches a certain level, the contaminants deposited on the surface of the insulation equipment become wetted, and the soluble salts in the contaminants dissolve and adhere to the surface of the insulation equipment, leading to a significant decrease in its insulation performance. Furthermore, the concentration of soluble salts also affects the difference in insulation performance. Therefore, when comparing arc development, the impact of salt density on arc development needs to be considered. In addition, altitude also has a significant impact on arc development.

[0041] Method for determining umbrella-shaped structure parameters: ① Creepage coefficient CF: The CF value k is determined based on altitude. cf In general, k cf Generally between 3.5 and 4.3; ② Umbrella spacing and umbrella extension: Compare the pressure resistance U of the umbrella spacing based on the degree of soiling and altitude. sj The pressure resistance value U between umbrella edges sl The degree of bridging was determined, and the optimized umbrella spacing k was obtained through comprehensive analysis. sj And umbrella extension parameter k ss ; ③ Number of skirts: Based on the required pressure resistance value U of the composite and sleeve, divided by the pressure resistance value U of a single umbrella structure. 单 To obtain the required number of single-group umbrella types; ④ The electric field at the end region is homogenized.

[0042] 4) Apply the parameters obtained above to the production of composite materials and sleeves, and conduct experimental verification. Based on the experimental verification of the structural rationality, optimize the parameters. For example... Figure 4 As shown.

[0043] Step 104: Conduct experimental verification of the composite insulator with umbrella-shaped structural parameters, and iteratively optimize the umbrella-shaped structural parameters of the composite insulator based on the verification results until the test requirements are met.

[0044] This invention relates to a design method for a composite insulator umbrella structure at high altitudes, wherein: (1) The arc develops along the shortest air gap, the total shortest air gap, or the surface with the weakest insulation strength. The optimal umbrella structure parameters are given by comparing the local insulation performance of the composite bushing. (2) The degree of bridging during the development of the electric arc is used as the basis for judging the quality of the umbrella-shaped structure of the composite insulator; (3) Based on a large amount of artificial pollution test data, this invention proposes the correlation between the pollution withstand voltage characteristics of composite insulators and umbrella structure and altitude.

[0045] This invention, through extensive artificial pollution test data, comprehensively analyzes the relationship between the umbrella extension, umbrella spacing, umbrella size structure, and altitude correction of composite insulators, obtaining the optimal umbrella design method and solving the problem of the lack of supporting parameters in the current design of composite insulator umbrella structures. The method described in this invention can quickly and reasonably provide the umbrella structure parameters for composite insulators. This invention not only helps reduce equipment manufacturing costs but also promotes the safe and stable operation of power transmission systems and can significantly save operating costs.

[0046] The following are examples illustrating the design method and implementation of umbrella-shaped structures for composite insulators used at high altitudes.

[0047] A newly constructed ultra-high voltage (UHV) power transmission project requires a batch of composite insulation equipment, such as composite bushings and bushings. To obtain reasonable design parameters for the umbrella-shaped structure of the composite insulation and bushings, the design unit and manufacturer need to design the structure based on parameters such as operating voltage and altitude. The design unit first uses the pollution level specified in the project description to design the umbrella-shaped structure of the composite insulation and bushings using this method, thus proposing preliminary design parameters. The manufacturer then produces composite insulation and bushing samples according to the preliminary design dimensions, which are then submitted to a professional institution for pollution withstand voltage characteristic testing. Finally, the final structural dimensions of the composite insulation and bushings are determined based on the test results. This process allows for the development of economically reasonable insulation structure dimensions for composite insulation and bushings, while also ensuring the stable operation of the system.

[0048] Figure 5 This is a structural diagram of an umbrella-shaped design system for a composite sleeve used at high altitudes according to an embodiment of the present invention.

[0049] like Figure 5 As shown, the present invention provides an umbrella-shaped design system for a composite sleeve used at high altitudes, characterized in that the system includes: Initial unit 501 is used to determine the application environment parameters of the composite insulator; based on the application environment parameters, the basic parameters of the composite insulator are determined. Preferably, the application environment parameters include: altitude parameters, pollution level parameters, and meteorological condition parameters; the meteorological condition parameters include wind speed, precipitation intensity, and icing thickness. The basic parameters include: insulation distance and structural height; the insulation distance is determined based on the electrical clearance requirements at high altitudes, and the structural height is adapted to the overall installation space requirements of the composite bushing.

[0050] Unit 502 is used to determine the umbrella-shaped structure parameters of the composite insulator by combining the environmental parameters and the foundation parameters. Preferably, the umbrella structure parameters include: creepage coefficient value, umbrella spacing, umbrella extension amount, number of umbrella skirts, and electric field homogenization structure at the end region; The creepage coefficient value is determined based on the altitude parameter, and the creepage coefficient value ranges from 3.5 to 4.3. Based on the pollution level parameters and altitude parameters, the withstand voltage between the umbrellas and the withstand voltage along the umbrella surface of the composite insulator are calculated by simulation to determine the degree of arc bridging between the umbrellas, and the umbrella spacing and umbrella extension are obtained based on the degree of arc bridging between the umbrellas. The number of umbrella skirts is calculated by dividing the total withstand voltage requirement of the composite insulator by the rated withstand voltage of a single umbrella structure. The electric field at the end region is homogenized.

[0051] The electric field homogenization structure at the end region is achieved by setting up an equalizing ring.

[0052] Preferably, the parameters of the umbrella structure are determined with the arc-blocking bridging performance as the core evaluation index and the electric field distribution characteristics as the auxiliary optimization index.

[0053] Preferably, it further includes: The degree of arc bridging between umbrellas is determined based on the effect of salt density on the electric arc.

[0054] The execution unit 503 is used to test and verify the composite insulator with umbrella-shaped structural parameters, and iteratively optimize the umbrella-shaped structural parameters of the composite insulator based on the verification results until the test requirements are met.

[0055] The umbrella-shaped design system for a composite sleeve used at high altitudes according to one embodiment of the present invention corresponds to the umbrella-shaped design method for a composite sleeve used at high altitudes according to another embodiment of the present invention, and will not be described again here.

[0056] The present invention has been described with reference to a few embodiments. However, it will be apparent to those skilled in the art that other embodiments besides those disclosed above fall equivalently within the scope of the present invention.

[0057] Generally, all terms used in this invention are interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0058] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention 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.

[0059] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0060] 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 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0061] 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.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for designing an umbrella-shaped composite sleeve for high-altitude applications, characterized in that, The method includes: Determine the application environment parameters for composite insulators; Based on the application environment parameters, the basic parameters of the composite insulator are determined; Based on the environmental parameters and the basic parameters, the umbrella-shaped structural parameters of the composite insulator are determined. The composite insulator with the aforementioned umbrella-shaped structural parameters was tested and verified. Based on the verification results, the umbrella-shaped structural parameters of the composite insulator were iteratively optimized until the test requirements were met.

2. The method according to claim 1, characterized in that, The application environment parameters include: altitude parameters, pollution level parameters, and meteorological condition parameters; the meteorological condition parameters include wind speed, precipitation intensity, and icing thickness. The basic parameters include: insulation distance and structural height; the insulation distance is determined based on the electrical clearance requirements at high altitudes, and the structural height is adapted to the overall installation space requirements of the composite bushing.

3. The method according to claim 2, characterized in that, The umbrella-shaped structural parameters include: creepage coefficient value, umbrella spacing, umbrella extension amount, number of umbrella skirts, and electric field homogenization structure at the end region; The creepage coefficient value is determined based on the altitude parameter, and the creepage coefficient value ranges from 3.5 to 4.

3. Based on the pollution level parameters and the altitude parameters, the withstand voltage between the umbrellas and the withstand voltage along the umbrella surface of the composite insulator are calculated by simulation to determine the degree of arc bridging between the umbrellas. Based on the degree of arc bridging between the umbrellas, the umbrella spacing and the umbrella extension amount are obtained. The number of umbrella skirts is calculated by dividing the total withstand voltage requirement of the composite insulator by the rated withstand voltage of a single umbrella structure. The electric field at the end region is homogenized. The electric field homogenization structure at the end region is achieved by setting up an equalizing ring.

4. The method according to claim 3, characterized in that, The determination of the umbrella-shaped structure parameters is based on the arc-bridging performance as the core evaluation index, and the electric field distribution characteristics as the auxiliary optimization index.

5. The method according to claim 3, characterized in that, Also includes: The degree of arc bridging between umbrellas is determined based on the effect of salt density on the electric arc.

6. A composite sleeve umbrella-shaped design system for high-altitude applications, characterized in that, The system includes: An initial unit is used to determine the application environment parameters of the composite insulator; based on the application environment parameters, the basic parameters of the composite insulator are determined. The determining unit is used to determine the umbrella-shaped structure parameters of the composite insulator by combining the environmental parameters and the basic parameters. The execution unit is used to test and verify the composite insulator with the umbrella-shaped structure parameters, and iteratively optimize the umbrella-shaped structure parameters of the composite insulator according to the verification results until the test requirements are met.

7. The system according to claim 6, characterized in that, The application environment parameters include: altitude parameters, pollution level parameters, and meteorological condition parameters; the meteorological condition parameters include wind speed, precipitation intensity, and icing thickness. The basic parameters include: insulation distance and structural height; the insulation distance is determined based on the electrical clearance requirements at high altitudes, and the structural height is adapted to the overall installation space requirements of the composite bushing.

8. The system according to claim 7, characterized in that, The umbrella-shaped structural parameters include: creepage coefficient value, umbrella spacing, umbrella extension amount, number of umbrella skirts, and electric field homogenization structure at the end region; The creepage coefficient value is determined based on the altitude parameter, and the creepage coefficient value ranges from 3.5 to 4.

3. Based on the pollution level parameters and the altitude parameters, the withstand voltage between the umbrellas and the withstand voltage along the umbrella surface of the composite insulator are calculated by simulation to determine the degree of arc bridging between the umbrellas. Based on the degree of arc bridging between the umbrellas, the umbrella spacing and the umbrella extension amount are obtained. The number of umbrella skirts is calculated by dividing the total withstand voltage requirement of the composite insulator by the rated withstand voltage of a single umbrella structure. The electric field at the end region is homogenized. The electric field homogenization structure at the end region is achieved by setting up an equalizing ring.

9. The system according to claim 8, characterized in that, The determination of the umbrella-shaped structure parameters is based on the arc-bridging performance as the core evaluation index, and the electric field distribution characteristics as the auxiliary optimization index.

10. The system according to claim 8, characterized in that, Also includes: The degree of arc bridging between umbrellas is determined based on the effect of salt density on the electric arc.

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