Optimization design method and design device of low-frequency on-load tap changer

Abstract

The application provides a low-frequency on-load tap changer optimization design method and a design device. The method comprises the following steps: establishing an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution of the contactor inside and the contact area of the low-frequency on-load tap changer. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer in the operation process of the switch. The vacuum tube lever is a mechanical component for driving the vacuum tube to open and close. The manufacturing material of the contactor of the low-frequency on-load tap changer is determined according to the electric field simulation model, and the parallel number of the contactor is determined according to the electrical conductivity of the manufacturing material of the contactor. The structure of the vacuum tube lever is optimized according to the vacuum tube lever model. The method solves the problem that the service life of the low-frequency on-load tap changer is low due to the unreasonable design of the contactor and the vacuum tube lever in the prior art.

Description

Technical Field

[0001] This invention relates to the field of power equipment, and more specifically, to a method, apparatus, computer-readable storage medium, computer program product, and system for optimizing the design of low-frequency on-load tap changers. Background Technology

[0002] Flexible low-frequency (20Hz and below) power transmission technology is a high-efficiency AC power transmission technology based on power electronics. It can effectively improve the transmission capacity, transmission distance, and transmission efficiency of transmission lines, and has technical and economic advantages in scenarios such as offshore wind power transmission, with a very broad development prospect. At the same time, low-frequency flexible power transmission systems face new challenges such as equipment voltage fluctuations, and the need to optimize system reactive power and harmonic characteristics. Using on-load tap changers in transformers for low-frequency power transmission can effectively solve this problem.

[0003] In designing low-frequency on-load tap changers, existing technologies suffer from the following key problems: the selection of contact materials is not adequately adapted to the unique electric field distribution and arc pressure in low-frequency environments, which may lead to premature contact wear and poor electrical contact, affecting the reliability and lifespan of the switch; the determination of the number of contacts in parallel ignores the relationship between the current carrying capacity of the contact material and the contact area, resulting in uneven current density distribution, increasing thermal stress and arc instability; furthermore, the optimization of the vacuum tube lever structure is insufficient, failing to consider the precise analysis of stress distribution under dynamic loads, and the mechanical strength and wear resistance of the material are not adequately considered, leading to easy deformation and wear of the lever during frequent operation, affecting the opening and closing accuracy and reliability of the vacuum tube, increasing maintenance costs, and reducing the service life of the low-frequency on-load tap changer. Summary of the Invention

[0004] The main objective of this application is to provide a method, apparatus, computer-readable storage medium, computer program product, and system for optimizing the design of low-frequency on-load tap changers, so as to at least solve the problem of low service life of low-frequency on-load tap changers caused by unreasonable design of contacts and vacuum tube levers in the prior art.

[0005] To achieve the above objectives, according to one aspect of this application, a method for optimizing the design of a low-frequency on-load tap changer is provided, comprising: establishing an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer; the electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer; the contacts include main contacts, transition contacts, and fixed contacts; the contact area is the surface area where current is transmitted between the contacts and other electrical components; the vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation; the vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions; determining the manufacturing material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determining the number of contacts connected in parallel based on the conductivity of the manufacturing material; and optimizing the structure of the vacuum tube lever based on the vacuum tube lever model.

[0006] Optionally, determining the material for the contacts of the low-frequency on-load tap changer based on the electric field simulation model includes: determining the electric field strength of the contact area of ​​the contacts based on the electric field simulation model; and calculating the minimum breakdown voltage V of the contact area based on the electric field strength of the contact area and the contact spacing of the contacts. b =E c ×d, where E c Let d be the electric field strength of the contact area, d be the contact spacing of the contact, the contact spacing is the minimum physical distance between the contact and the adjacent electrical component, and the minimum breakdown voltage is the lowest voltage threshold at which the contact area of ​​the contact and the adjacent electrical component undergo electrical breakdown. A material with an electrical strength greater than the minimum breakdown voltage is selected as the material for manufacturing the contact, and the electrical strength is the maximum voltage value that the electrical insulation material can withstand under the action of an electric field.

[0007] Optionally, determining the number of contacts in parallel based on the conductivity of the material used to manufacture the contacts includes: calculating the current density J of the contacts based on the electric field strength of the contact area and the material used to manufacture the contacts. c =σ·E c Where σ is the electrical conductivity of the material used to manufacture the contact; the current carrying capacity I of the contact is calculated based on the current density of the contact. c =J c ×S, where S is the area of ​​the contact region of the contact; the number of contacts connected in parallel is determined according to the current carried by the contact. Among them, I t This refers to the load current that the low-frequency on-load tap changer needs to carry.

[0008] Optionally, optimizing the structure of the vacuum tube lever based on the vacuum tube lever model includes: applying an external load to the vacuum tube lever model according to actual working conditions, the external load including a vacuum tube self-closing force and a spring force, the vacuum tube self-closing force being the closing force provided by the vacuum tube lever during opening and closing operations, and the spring force being the pressure applied to the vacuum tube lever by a spring; and calculating the stress of the vacuum tube lever model under the external load. Where f y The external load acting on the vacuum tube lever is A, where A is the area of ​​the vacuum tube lever bearing the external load; the stress determines whether the vacuum tube lever undergoes plastic deformation.

[0009] Optionally, determining whether the vacuum tube lever has undergone plastic deformation based on the stress includes: if the stress on the vacuum tube lever is greater than the yield strength, determining that the vacuum tube lever has undergone plastic deformation, adjusting the structure of the vacuum tube lever, wherein the yield strength is the minimum stress value at which the vacuum tube lever undergoes plastic deformation; and if the stress on the vacuum tube lever is less than the yield strength, determining that the vacuum tube lever has not undergone plastic deformation.

[0010] Optionally, adjusting the structure of the vacuum tube lever includes: increasing the stress-bearing area of ​​the vacuum tube lever where the stress is greater than the yield strength; and / or adjusting the material of the vacuum tube lever to a material where the yield strength is greater than the stress.

[0011] To achieve the above objectives, according to one aspect of this application, a low-frequency on-load tap changer optimization design device is provided, comprising: a first establishment unit, configured to establish an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer, wherein the electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer, the contacts including main contacts, transition contacts and fixed contacts, the contact area being the surface area where current is transmitted between the contacts and other electrical components, and the vacuum tube lever model being used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during switching operation, the vacuum tube lever being a mechanical component driving the vacuum tube to perform opening and closing actions; a first determination unit, configured to determine the manufacturing material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determine the number of contacts connected in parallel based on the conductivity of the manufacturing material of the contacts; and a first optimization unit, configured to optimize the structure of the vacuum tube lever based on the vacuum tube lever model.

[0012] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls any of the methods described in the device where the computer-readable storage medium is located.

[0013] According to another aspect of this application, a computer program product is provided, comprising a computer program that, when executed by a processor, implements any of the methods described.

[0014] According to another aspect of this application, a low-frequency on-load tap changer optimization design system is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include methods for performing any one of the methods described.

[0015] The technical solution of this application, in the above-mentioned low-frequency on-load tap changer optimization design method, includes: establishing an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer; the electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer; the contacts include main contacts, transition contacts, and fixed contacts; the contact area is the surface area where current is transmitted between the contacts and other electrical components; the vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation; the vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions; determining the manufacturing material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determining the number of contacts connected in parallel based on the conductivity of the manufacturing material; and optimizing the structure of the vacuum tube lever based on the vacuum tube lever model. This application establishes an electric field simulation model of a low-frequency on-load tap changer, optimizes the design of the contact material and the number of parallel contacts, and establishes a vacuum tube lever model to optimize the structure of the vacuum tube lever of the low-frequency on-load tap changer. Through the optimized design of the contacts and vacuum tube lever, the arc control capability and mechanical strength of the low-frequency on-load tap changer are improved, solving the problem of low service life of low-frequency on-load tap changers caused by unreasonable design of contacts and vacuum tube levers in the prior art. Attached Figure Description

[0016] Figure 1 A hardware structure block diagram of a mobile terminal implementing a low-frequency on-load tap changer optimization design method is shown in an embodiment of this application.

[0017] Figure 2A flowchart illustrating an optimized design method for a low-frequency on-load tap changer according to an embodiment of this application is shown.

[0018] Figure 3 A structural block diagram of a low-frequency on-load tap changer optimization design device provided according to an embodiment of this application is shown.

[0019] The above figures include the following reference numerals:

[0020] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] As described in the background section, the design of contacts and vacuum tube levers in existing low-frequency on-load tap changers is not fully considered, resulting in a significant reduction in the service life of low-frequency on-load tap changers. To solve this technical problem, embodiments of this application provide a low-frequency on-load tap changer optimization design method, design device, computer-readable storage medium, computer program product, and low-frequency on-load tap changer optimization design system.

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal based on a low-frequency on-load tap changer optimization design method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0027] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to a low-frequency on-load tap changer optimization design method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0028] This embodiment provides a low-frequency on-load tap changer optimization design method that runs on a mobile terminal, computer terminal or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although the logical order is shown in the flowchart, in some cases the steps shown or described can be executed in a different order than that shown here.

[0029] Figure 2 This is a flowchart illustrating an optimized design method for a low-frequency on-load tap changer according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0030] Step S201: Establish an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions.

[0031] Specifically, the electric field simulation model aims to explore the electric field distribution in the contact areas between the main contacts, transition contacts, and stationary contacts of the switch and other electrical components. The vacuum tube lever model focuses on studying the mechanical characteristics of the mechanical components that drive the opening and closing of the vacuum tube during switch operation. Through the application of these two models, we can achieve in-depth analysis of low-frequency on-load tap changers. The electric field simulation model helps us understand the intensity and distribution of the electric field between contacts, which is of great importance for optimizing contact design and better preventing arcing based on the optimized design. The vacuum tube lever model allows us to optimize the vacuum tube lever, which is crucial for improving the reliability and lifespan of the switch.

[0032] Step S202: Determine the material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determine the number of contacts in parallel based on the conductivity of the material of the contacts.

[0033] Specifically, based on the results of the electric field simulation model, we select appropriate materials to manufacture the contacts of the low-frequency on-load tap changer, and determine the number of these contacts in parallel configuration based on the conductivity of the selected materials. This process first involves evaluating the electrical properties of the contact materials to ensure that they can adapt to the electric field environment. Then, based on the conductivity of these materials, we calculate the optimal number of contacts in parallel to achieve the required electrical performance.

[0034] Step S203: Optimize the structure of the vacuum tube lever based on the vacuum tube lever model described above.

[0035] Specifically, a vacuum tube lever model is used for structural optimization to improve the design of the vacuum tube lever. This process involves applying a force to the vacuum tube lever model, calculating the stress on the vacuum tube lever based on the applied force, and adjusting the structure of the vacuum tube lever according to the magnitude of the stress so that the vacuum tube lever can withstand the stress, reduce the risk of failure, and improve the safety of switching operations.

[0036] In this embodiment, in the above-mentioned optimization design method for a low-frequency on-load tap changer, an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer are established. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions. The material for manufacturing the contacts of the low-frequency on-load tap changer is determined based on the electric field simulation model, and the number of contacts connected in parallel is determined based on the conductivity of the material. The structure of the vacuum tube lever is optimized based on the vacuum tube lever model. This application establishes an electric field simulation model of a low-frequency on-load tap changer, optimizes the design of the contact material and the number of parallel contacts, and establishes a vacuum tube lever model to optimize the structure of the vacuum tube lever of the low-frequency on-load tap changer. Through the optimized design of the contacts and vacuum tube lever, the arc control capability and mechanical strength of the low-frequency on-load tap changer are improved, solving the problem of low service life of low-frequency on-load tap changers caused by unreasonable design of contacts and vacuum tube levers in the prior art.

[0037] To determine the material for manufacturing a low-frequency on-load tap changer, in one optional embodiment, the electric field strength of the contact area of ​​the contact is determined according to the above-mentioned electric field simulation model. Step S202 includes:

[0038] Step S2021: Determine the electric field strength of the contact area of ​​the contact according to the above electric field simulation model;

[0039] Specifically, the electric field strength of the contact area in a low-frequency on-load tap changer is determined based on data obtained from an electric field simulation model. In this way, we can accurately obtain the electric field strength of the contact area and determine whether the contact area of ​​the contact meets the working requirements. If not, the structure of the contact is adjusted to improve the performance and reliability of the switch.

[0040] Step S2022: Based on the electric field strength of the contact area and the contact spacing of the contacts, calculate the minimum breakdown voltage V of the contact area. b =E c ×d, where E c The electric field strength of the contact area is d, the contact distance of the contact is the minimum physical distance between the contact and the adjacent electrical component, and the minimum breakdown voltage is the lowest voltage threshold at which the contact area of ​​the contact and the adjacent electrical component undergo electrical breakdown.

[0041] Specifically, we calculate the minimum breakdown voltage of the contact area based on the electric field strength of the contact area and the minimum physical distance between the contacts. This calculation reflects the lowest voltage threshold at which electrical breakdown occurs between the contacts and their adjacent electrical components. This calculation enables more accurate risk assessment and helps to optimize the materials of the contacts to improve insulation performance.

[0042] Step S2023: Select a material with an electrical strength greater than the minimum breakdown voltage as the material for manufacturing the contact, where the electrical strength is the maximum voltage that the electrical insulation material can withstand under the action of an electric field.

[0043] Specifically, insulation materials with electrical strength exceeding the calculated minimum breakdown voltage are selected for manufacturing contacts. Materials with high electrical strength can provide better protection. This material selection strategy ensures that the electrical performance of the contact materials meets safety requirements in practical applications, reduces the risk of failure due to material breakdown, and enhances the durability and safety of the equipment.

[0044] To determine the number of contacts connected in parallel, in one optional embodiment, the number of contacts connected in parallel is determined based on the conductivity of the material used to manufacture the contacts. Step S202 further includes:

[0045] Step S2024: Calculate the current density J of the contact based on the electric field strength of the contact area and the material used to manufacture the contact. c =σ·E c Where σ is the electrical conductivity of the material used to manufacture the contact;

[0046] Specifically, based on the electric field strength in the contact area and the conductivity of the material used, the current density of the contact can be calculated. Current density refers to the amount of current passing through a unit area, while conductivity is a measure of a material's ability to conduct electricity. By calculating the current density, we can ensure the efficiency and uniformity of the contact during conduction, avoid overheating and potential damage caused by current concentration, and help to optimize the design of the contact in the future.

[0047] Step S2025: Calculate the carrying current I of the contact based on the current density of the contact. c =J c ×S, where S is the area of ​​the contact region of the aforementioned contact;

[0048] Specifically, the current carrying capacity of the contact is calculated based on the current density of the contact and the area of ​​the contact contact region. Through this calculation, we can determine the current carrying capacity of the contact, and the calculation results can guide the design of the contact to ensure that the contact can meet specific current transmission requirements.

[0049] Step S2026: Determine the number of contacts connected in parallel based on the current carried by the contacts. Among them, I t This refers to the load current that the aforementioned low-frequency on-load tap changer needs to carry.

[0050] Specifically, the required number of contacts connected in parallel is determined based on the current that the contacts can carry and the load current that the switch needs to carry. This configuration ensures that the low-frequency on-load tap changer can safely and effectively transmit the required current load. This method of determining the number of contacts connected in parallel helps to achieve uniform current distribution, reduces the risk of individual contacts overheating or being damaged due to excessive current, and thus improves the stability and lifespan of the entire switching system.

[0051] To optimize the vacuum tube lever, in one optional embodiment, the structure of the vacuum tube lever is optimized according to the above-described vacuum tube lever model. Step S203 includes:

[0052] Step S2031: Apply an external load to the vacuum tube lever model according to the actual working conditions. The external load includes the vacuum tube self-closing force and the spring force. The vacuum tube self-closing force is the closing force provided by the vacuum tube lever during the opening and closing operation. The spring force is the pressure applied to the vacuum tube lever by the spring.

[0053] Specifically, external forces under actual working conditions are applied to the vacuum tube lever model. These forces include the self-closing force of the vacuum tube and the pressure applied by the spring. By applying this external load, we can more accurately simulate and analyze the mechanical effects of the vacuum tube lever in actual operation, thereby optimizing its structural design.

[0054] Step S2032: Calculate the stress of the vacuum tube lever model under the aforementioned external load. Where f y The external load acting on the vacuum tube lever is A, where A is the area of ​​the vacuum tube lever bearing the external load.

[0055] Specifically, the stress level under external load is calculated based on the vacuum tube lever model. The stress is the ratio of the external force to the force-bearing area of ​​the lever. Through this calculation, the structural stress distribution of the vacuum tube lever under actual working conditions can be evaluated. This stress calculation helps to identify potential weaknesses in the lever design so as to optimize the lever geometry and material selection to improve its load-bearing capacity and durability.

[0056] Step S2033: Determine whether the vacuum tube lever has undergone plastic deformation based on the stress described above.

[0057] Specifically, by assessing the stress level of the vacuum tube lever under external load, it can be determined whether it has reached the condition for plastic deformation. Through this stress assessment, it is possible to predict whether the vacuum tube lever will undergo irreversible deformation due to excessive stress during actual operation.

[0058] To determine whether the vacuum tube lever has undergone plastic deformation, in one optional embodiment, the determination is based on the aforementioned stress. Step S2033 includes:

[0059] Step S20331: When the stress of the vacuum tube lever is greater than the yield strength, it is determined that the vacuum tube lever has undergone plastic deformation, and the structure of the vacuum tube lever is adjusted. The yield strength is the minimum stress value at which the vacuum tube lever undergoes plastic deformation.

[0060] Specifically, when the calculated stress on the vacuum tube lever exceeds its yield strength, we consider it to have undergone plastic deformation. Yield strength is the stress threshold at which a material begins to undergo plastic deformation. After confirming that deformation has occurred, we adjust the structure of the vacuum tube lever to avoid this phenomenon.

[0061] Step S20332: If the stress of the vacuum tube lever is less than the yield strength, it is determined that the vacuum tube lever has not undergone plastic deformation.

[0062] Specifically, when the calculated stress on the vacuum tube lever is lower than its yield strength, it can be determined that the lever has not undergone plastic deformation. This means that the lever material remains within its elastic range under the force applied and has not suffered permanent damage.

[0063] In order to optimize the structure of the vacuum tube lever, in one optional embodiment, the structure of the vacuum tube lever is adjusted, and step S20331 includes:

[0064] Step S2033101: Increase the stress area of ​​the vacuum tube lever where the stress is greater than the yield strength;

[0065] Specifically, for the vacuum tube lever area where the stress level exceeds the yield strength, we reduce the magnitude of the stress by increasing the area of ​​the stress-bearing region. This adjustment helps to disperse the stress, ensure that the material works under a lower stress level, prevent plastic deformation, thereby extending the service life of the switch and reducing maintenance and replacement costs.

[0066] Step S2033102, and / or, adjust the material of the vacuum tube lever to a material with a yield strength greater than the stress.

[0067] Specifically, a material with a yield strength higher than the existing stress level is selected to manufacture the vacuum tube lever. This material replacement ensures that the lever will not reach the critical point of plastic deformation under any working condition, improves the overall load-bearing capacity of the lever, reduces the risk of structural damage caused by material yielding, and thus improves the durability of the switch.

[0068] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0069] This application also provides a low-frequency on-load tap changer optimization design apparatus. It should be noted that this apparatus can be used to execute the low-frequency on-load tap changer optimization design method provided in this application. This apparatus is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0070] The following describes an optimized design device for a low-frequency on-load tap changer provided in an embodiment of this application.

[0071] Figure 3 This is a structural block diagram of a low-frequency on-load tap changer optimization design device according to an embodiment of this application. Figure 3 As shown, the device includes:

[0072] The first establishment unit 10 is used to establish an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and the contact area of ​​the low-frequency on-load tap changer. The contacts include main contacts, transition contacts and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions.

[0073] Specifically, the electric field simulation model aims to explore the electric field distribution in the contact areas between the main contacts, transition contacts, and stationary contacts of the switch and other electrical components. The vacuum tube lever model focuses on studying the mechanical characteristics of the mechanical components that drive the opening and closing of the vacuum tube during switch operation. Through the application of these two models, we can achieve in-depth analysis of low-frequency on-load tap changers. The electric field simulation model helps us understand the intensity and distribution of the electric field between contacts, which is of great importance for optimizing contact design and better preventing arcing based on the optimized design. The vacuum tube lever model allows us to optimize the vacuum tube lever, which is crucial for improving the reliability and lifespan of the switch.

[0074] The first determining unit 20 is used to determine the manufacturing material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and to determine the number of contacts in parallel according to the conductivity of the manufacturing material of the contacts.

[0075] Specifically, based on the results of the electric field simulation model, we select appropriate materials to manufacture the contacts of the low-frequency on-load tap changer, and determine the number of these contacts in parallel configuration based on the conductivity of the selected materials. This process first involves evaluating the electrical properties of the contact materials to ensure that they can adapt to the electric field environment. Then, based on the conductivity of these materials, we calculate the optimal number of contacts in parallel to achieve the required electrical performance.

[0076] The first optimization unit 30 is used to optimize the structure of the vacuum tube lever according to the vacuum tube lever model.

[0077] Specifically, a vacuum tube lever model is used for structural optimization to improve the design of the vacuum tube lever. This process involves applying a force to the vacuum tube lever model, calculating the stress on the vacuum tube lever based on the applied force, and adjusting the structure of the vacuum tube lever according to the magnitude of the stress so that the vacuum tube lever can withstand the stress, reduce the risk of failure, and improve the safety of switching operations.

[0078] In this embodiment, the first establishing unit is used to establish an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions. The first determining unit is used to determine the manufacturing material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and to determine the number of contacts connected in parallel based on the conductivity of the manufacturing material. The first optimization unit is used to optimize the structure of the vacuum tube lever based on the vacuum tube lever model. This application establishes an electric field simulation model of a low-frequency on-load tap changer, optimizes the design of the contact material and the number of parallel contacts, and establishes a vacuum tube lever model to optimize the structure of the vacuum tube lever of the low-frequency on-load tap changer. Through the optimized design of the contacts and vacuum tube lever, the arc control capability and mechanical strength of the low-frequency on-load tap changer are improved, solving the problem of low service life of low-frequency on-load tap changers caused by unreasonable design of contacts and vacuum tube levers in the prior art.

[0079] To determine the material for manufacturing a low-frequency on-load tap changer, in one optional embodiment, the electric field strength of the contact area of ​​the contact is determined based on the aforementioned electric field simulation model. The first determining unit includes:

[0080] The first determining subunit is used to determine the electric field strength of the contact area of ​​the contact according to the electric field simulation model.

[0081] Specifically, the electric field strength of the contact area in a low-frequency on-load tap changer is determined based on data obtained from an electric field simulation model. In this way, we can accurately obtain the electric field strength of the contact area and determine whether the contact area of ​​the contact meets the working requirements. If not, the structure of the contact is adjusted to improve the performance and reliability of the switch.

[0082] The second determining subunit is used to calculate the minimum breakdown voltage V of the contact area based on the electric field strength of the contact area and the contact spacing of the contacts. b =E c ×d, where E cThe electric field strength of the contact area is d, the contact distance of the contact is the minimum physical distance between the contact and the adjacent electrical component, and the minimum breakdown voltage is the lowest voltage threshold at which the contact area of ​​the contact and the adjacent electrical component undergo electrical breakdown.

[0083] Specifically, we calculate the minimum breakdown voltage of the contact area based on the electric field strength of the contact area and the minimum physical distance between the contacts. This calculation reflects the lowest voltage threshold at which electrical breakdown occurs between the contacts and their adjacent electrical components. This calculation enables more accurate risk assessment and helps to optimize the materials of the contacts to improve insulation performance.

[0084] The third determining subunit is used to select a material with an electrical strength greater than the minimum breakdown voltage as the material for manufacturing the contact, wherein the electrical strength is the maximum voltage value that the electrical insulation material can withstand under the action of an electric field.

[0085] Specifically, insulation materials with electrical strength exceeding the calculated minimum breakdown voltage are selected for manufacturing contacts. Materials with high electrical strength can provide better protection. This material selection strategy ensures that the electrical performance of the contact materials meets safety requirements in practical applications, reduces the risk of failure due to material breakdown, and enhances the durability and safety of the equipment.

[0086] To determine the number of contacts connected in parallel, in one optional embodiment, the number of contacts connected in parallel is determined based on the conductivity of the material used to manufacture the contacts. The first determining unit further includes:

[0087] The fourth determining subunit is used to calculate the current density J of the contact based on the electric field strength of the contact area and the material used to manufacture the contact. c =σ·E c Where σ is the electrical conductivity of the material used to manufacture the contact;

[0088] Specifically, based on the electric field strength in the contact area and the conductivity of the material used, the current density of the contact can be calculated. Current density refers to the amount of current passing through a unit area, while conductivity is a measure of a material's ability to conduct electricity. By calculating the current density, we can ensure the efficiency and uniformity of the contact during conduction, avoid overheating and potential damage caused by current concentration, and help to optimize the design of the contact in the future.

[0089] The fifth determining subunit is used to calculate the carrying current I of the contact based on the current density of the contact. c =J c ×S, where S is the area of ​​the contact region of the aforementioned contact;

[0090] Specifically, the current carrying capacity of the contact is calculated based on the current density of the contact and the area of ​​the contact contact region. Through this calculation, we can determine the current carrying capacity of the contact, and the calculation results can guide the design of the contact to ensure that the contact can meet specific current transmission requirements.

[0091] The sixth determining subunit is used to determine the number of contacts connected in parallel based on the current carried by the contacts. Among them, I t This refers to the load current that the aforementioned low-frequency on-load tap changer needs to carry.

[0092] Specifically, the required number of contacts connected in parallel is determined based on the current that the contacts can carry and the load current that the switch needs to carry. This configuration ensures that the low-frequency on-load tap changer can safely and effectively transmit the required current load. This method of determining the number of contacts connected in parallel helps to achieve uniform current distribution, reduces the risk of individual contacts overheating or being damaged due to excessive current, and thus improves the stability and lifespan of the entire switching system.

[0093] To optimize the vacuum tube lever, in one optional embodiment, the structure of the vacuum tube lever is optimized according to the aforementioned vacuum tube lever model. The first optimization unit includes:

[0094] The first optimization subunit is used to apply an external load to the vacuum tube lever model according to the actual working conditions. The external load includes the vacuum tube self-closing force and the spring force. The vacuum tube self-closing force is the closing force provided by the vacuum tube lever during the switching operation, and the spring force is the pressure applied to the vacuum tube lever by the spring.

[0095] Specifically, external forces under actual working conditions are applied to the vacuum tube lever model. These forces include the self-closing force of the vacuum tube and the pressure applied by the spring. By applying this external load, we can more accurately simulate and analyze the mechanical effects of the vacuum tube lever in actual operation, thereby optimizing its structural design.

[0096] The second optimization sub-unit is used to calculate the stress of the aforementioned vacuum tube lever model under the aforementioned external load. Where f y The external load acting on the vacuum tube lever is A, where A is the area of ​​the vacuum tube lever bearing the external load.

[0097] Specifically, the stress level under external load is calculated based on the vacuum tube lever model. The stress is the ratio of the external force to the force-bearing area of ​​the lever. Through this calculation, the structural stress distribution of the vacuum tube lever under actual working conditions can be evaluated. This stress calculation helps to identify potential weaknesses in the lever design so as to optimize the lever geometry and material selection to improve its load-bearing capacity and durability.

[0098] The third optimization subunit is used to determine whether the vacuum tube lever has undergone plastic deformation based on the stress mentioned above.

[0099] Specifically, by assessing the stress level of the vacuum tube lever under external load, it can be determined whether it has reached the condition for plastic deformation. Through this stress assessment, it is possible to predict whether the vacuum tube lever will undergo irreversible deformation due to excessive stress during actual operation.

[0100] To determine whether the vacuum tube lever has undergone plastic deformation, in one optional embodiment, the determination is based on the aforementioned stress. The third optimization subunit includes:

[0101] The first optimization module is used to determine that the vacuum tube lever has undergone plastic deformation when the stress of the vacuum tube lever is greater than the yield strength, and to adjust the structure of the vacuum tube lever. The yield strength is the minimum stress value at which the vacuum tube lever undergoes plastic deformation.

[0102] When the calculated stress on the vacuum tube lever exceeds its yield strength, we consider it to have undergone plastic deformation. Yield strength is the stress threshold at which a material begins to undergo plastic deformation. After confirming that deformation has occurred, we adjust the structure of the vacuum tube lever to avoid this phenomenon.

[0103] The second optimization module is used to determine that the vacuum tube lever has not undergone plastic deformation when the stress of the vacuum tube lever is less than the yield strength.

[0104] Specifically, when the calculated stress on the vacuum tube lever is lower than its yield strength, it can be determined that the lever has not undergone plastic deformation. This means that the lever material remains within its elastic range under the force applied and has not suffered permanent damage.

[0105] To optimize the structure of the vacuum tube lever, in one optional embodiment, the structure of the vacuum tube lever is adjusted, and the first optimization module includes:

[0106] The first optimization submodule is used to increase the stress area of ​​the vacuum tube lever where the stress is greater than the yield strength.

[0107] Specifically, for the vacuum tube lever area where the stress level exceeds the yield strength, we reduce the magnitude of the stress by increasing the area of ​​the stress-bearing region. This adjustment helps to disperse the stress, ensure that the material works under a lower stress level, prevent plastic deformation, thereby extending the service life of the switch and reducing maintenance and replacement costs.

[0108] The second optimization submodule is used to adjust the material of the vacuum tube lever to a material with a yield strength greater than the stress.

[0109] Specifically, a material with a yield strength higher than the existing stress level is selected to manufacture the vacuum tube lever. This material replacement ensures that the lever will not reach the critical point of plastic deformation under any working condition, improves the overall load-bearing capacity of the lever, reduces the risk of structural damage caused by material yielding, and thus improves the durability of the switch.

[0110] The aforementioned low-frequency on-load tap changer optimization design device includes a processor and a memory. The first establishment unit, first determination unit, and first optimization unit are all stored as program units in the memory, and the processor executes these program units to achieve their respective functions. All of the above modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0111] The processor contains a core, which retrieves the corresponding program unit from memory. One or more cores can be configured, and adjusting core parameters allows for more precise optimization of the low-frequency on-load tap changer structure.

[0112] The memory may include non-permanent 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, and the memory includes at least one memory chip.

[0113] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the aforementioned low-frequency on-load tap changer optimization design method.

[0114] Specifically, an optimized design method for low-frequency on-load tap changers includes:

[0115] Step S201: Establish an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions.

[0116] Step S202: Determine the material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determine the number of contacts in parallel based on the conductivity of the material of the contacts.

[0117] Step S203: Optimize the structure of the vacuum tube lever based on the vacuum tube lever model described above.

[0118] This invention provides a processor for running a program, wherein the program executes the aforementioned low-frequency on-load tap changer optimization design method.

[0119] Specifically, an optimized design method for low-frequency on-load tap changers includes:

[0120] Step S201: Establish an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions.

[0121] Step S202: Determine the material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determine the number of contacts in parallel based on the conductivity of the material of the contacts.

[0122] Step S203: Optimize the structure of the vacuum tube lever based on the vacuum tube lever model described above.

[0123] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0124] Step S201: Establish an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions.

[0125] Step S202: Determine the material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determine the number of contacts in parallel based on the conductivity of the material of the contacts.

[0126] Step S203: Optimize the structure of the vacuum tube lever based on the vacuum tube lever model described above.

[0127] This application also provides a low-frequency on-load tap changer optimization design system, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, including executing any of the methods described above in the low-frequency on-load tap changer optimization design method.

[0128] Specifically, an optimized design method for low-frequency on-load tap changers includes:

[0129] Step S201: Establish an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions.

[0130] Step S202: Determine the material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and determine the number of contacts in parallel based on the conductivity of the material of the contacts.

[0131] Step S203: Optimize the structure of the vacuum tube lever based on the vacuum tube lever model described above.

[0132] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0138] 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.

[0139] 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, magnetic 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.

[0140] 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.

[0141] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0142] 1) This application discloses an optimization design method for a low-frequency on-load tap changer. The method establishes an electric field simulation model and a vacuum tube lever model for the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to open and close. Based on the electric field simulation model, the material used to manufacture the contacts of the low-frequency on-load tap changer is determined, and the number of contacts connected in parallel is determined based on the conductivity of the material. The structure of the vacuum tube lever is optimized based on the vacuum tube lever model. This application establishes an electric field simulation model of a low-frequency on-load tap changer, optimizes the design of the contact material and the number of parallel contacts, and establishes a vacuum tube lever model to optimize the structure of the vacuum tube lever of the low-frequency on-load tap changer. Through the optimized design of the contacts and vacuum tube lever, the arc control capability and mechanical strength of the low-frequency on-load tap changer are improved, solving the problem of low service life of low-frequency on-load tap changers caused by unreasonable design of contacts and vacuum tube levers in the prior art.

[0143] 2) A low-frequency on-load tap changer optimization design device according to this application includes a first establishing unit for establishing an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions. A first determining unit is used to determine the manufacturing material of the contacts of the low-frequency on-load tap changer based on the electric field simulation model, and to determine the number of contacts connected in parallel based on the conductivity of the manufacturing material. A first optimization unit is used to optimize the structure of the vacuum tube lever based on the vacuum tube lever model. This application establishes an electric field simulation model of a low-frequency on-load tap changer, optimizes the design of the contact material and the number of parallel contacts, and establishes a vacuum tube lever model to optimize the structure of the vacuum tube lever of the low-frequency on-load tap changer. Through the optimized design of the contacts and vacuum tube lever, the arc control capability and mechanical strength of the low-frequency on-load tap changer are improved, solving the problem of low service life of low-frequency on-load tap changers caused by unreasonable design of contacts and vacuum tube levers in the prior art.

[0144] The above description is merely a preferred embodiment of this application and is not intended to limit 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 protection scope of this application.

Claims

1. A method for optimizing the design of a low-frequency on-load tap changer, characterized in that, include: An electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer are established. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is the mechanical component that drives the vacuum tube to perform opening and closing actions. The material used to manufacture the contacts of the low-frequency on-load tap changer is determined based on the electric field simulation model, and the number of contacts connected in parallel is determined based on the conductivity of the material used to manufacture the contacts. The structure of the vacuum tube lever is optimized based on the vacuum tube lever model. Optimizing the structure of the vacuum tube lever based on the vacuum tube lever model includes: applying an external load to the vacuum tube lever model according to actual working conditions; the external load includes the vacuum tube self-closing force and the spring force; the vacuum tube self-closing force is the closing force provided by the vacuum tube lever during opening and closing operations; and the spring force is the pressure applied to the vacuum tube lever by the spring. The stress of the vacuum tube lever model under the external load is then calculated. ,in The external load acting on the vacuum tube lever, The area of ​​the vacuum tube lever that bears the external load is defined; the stress is used to determine whether the vacuum tube lever has undergone plastic deformation. Determining whether the vacuum tube lever has undergone plastic deformation based on the stress includes: if the stress on the vacuum tube lever is greater than the yield strength, determining that the vacuum tube lever has undergone plastic deformation, adjusting the structure of the vacuum tube lever, wherein the yield strength is the minimum stress value at which the vacuum tube lever undergoes plastic deformation; and if the stress on the vacuum tube lever is less than the yield strength, determining that the vacuum tube lever has not undergone plastic deformation. Adjusting the structure of the vacuum tube lever includes: increasing the stress-bearing area of ​​the vacuum tube lever where the stress is greater than the yield strength; and / or adjusting the material of the vacuum tube lever to a material where the yield strength is greater than the stress.

2. The method according to claim 1, characterized in that, The materials used to manufacture the contacts of the low-frequency on-load tap changer are determined based on the electric field simulation model, including: The electric field strength of the contact area of ​​the contact is determined based on the electric field simulation model. Based on the electric field strength in the contact area and the contact spacing of the contacts, the minimum breakdown voltage of the contact area is calculated. ,in, The electric field strength in the contact area. The contact spacing of the contact is the minimum physical distance between the contact and an adjacent electrical component, and the minimum breakdown voltage is the lowest voltage threshold at which the contact area of ​​the contact and the adjacent electrical component experience electrical breakdown. A material with an electrical strength greater than the minimum breakdown voltage is selected as the material for manufacturing the contact, where the electrical strength is the maximum voltage that the electrical insulation material can withstand under the action of an electric field.

3. The method according to claim 2, characterized in that, Determining the number of contacts in parallel based on the conductivity of the material used to manufacture the contacts includes: The current density of the contact is calculated based on the electric field strength in the contact area and the material used to manufacture the contact. ,in, The electrical conductivity of the material used to manufacture the contact; The carrying current of the contact is calculated based on the current density of the contact. ,in, The area of ​​the contact region of the contact; The number of contacts connected in parallel is determined based on the current carried by the contacts. ,in, This refers to the load current that the low-frequency on-load tap changer needs to carry.

4. An optimized design device for a low-frequency on-load tap changer, characterized in that, include: The first establishment unit is used to establish an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer. The electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer. The contacts include main contacts, transition contacts, and fixed contacts. The contact area is the surface area where current is transmitted between the contacts and other electrical components. The vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the low-frequency on-load tap changer during the switching operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions. The first determining unit is used to determine the material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and to determine the number of contacts in parallel according to the conductivity of the material of the contacts. The first optimization unit is used to optimize the structure of the vacuum tube lever according to the vacuum tube lever model; The first optimization unit includes: a first optimization subunit, used to apply an external load to the vacuum tube lever model according to actual working conditions, the external load including the vacuum tube self-closing force and the spring force, the vacuum tube self-closing force being the closing force provided by the vacuum tube lever during opening and closing operations, and the spring force being the pressure applied to the vacuum tube lever by the spring; and a second optimization subunit, used to calculate the stress of the vacuum tube lever model under the external load. ,in The external load acting on the vacuum tube lever, The third optimization subunit is used to determine whether the vacuum tube lever has undergone plastic deformation based on the stress. The third optimization subunit includes: a first optimization module, used to determine that the vacuum tube lever has undergone plastic deformation when the stress of the vacuum tube lever is greater than the yield strength, and to adjust the structure of the vacuum tube lever, wherein the yield strength is the minimum stress value at which the vacuum tube lever undergoes plastic deformation; and a second optimization module, used to determine that the vacuum tube lever has not undergone plastic deformation when the stress of the vacuum tube lever is less than the yield strength. The first optimization module includes: a first optimization submodule, used to increase the stress area of ​​the vacuum tube lever where the stress is greater than the yield strength; and a second optimization submodule, used to adjust the material of the vacuum tube lever to a material where the yield strength is greater than the stress.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 3.

6. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1 to 3.

7. A low-frequency on-load tap changer optimization design system, characterized in that, One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising methods for performing any one of claims 1 to 3.

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