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

Abstract

The invention provides an optimal design method and device for a low-frequency on-load tap-changer, and the method comprises the steps: building an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap-changer, and enabling the electric field simulation model to be used for analyzing the electric field distribution conditions of the interior of a contact of the low-frequency on-load tap-changer and a contact region of the contact; the vacuum tube lever model is used for analyzing mechanical behaviors of a vacuum tube lever of the low-frequency on-load tap-changer in a switching operation process, and the vacuum tube lever is a mechanical part for driving a vacuum tube to perform opening and closing actions; determining a manufacturing material of the contacts of the low-frequency on-load tap-changer according to the electric field simulation model, and determining the parallel connection number of the contacts according to the conductivity of the manufacturing material of the contacts; and optimizing the structure of the vacuum tube lever according to the vacuum tube lever model. According to the method, the problem that the service life of the low-frequency on-load switch is relatively short due to unreasonable design of the contact and the vacuum tube lever of the low-frequency on-load tap-changer in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of electric power equipment, and in particular to a low-frequency on-load tap changer optimization design method, a design device, a computer-readable storage medium, a computer program product and a low-frequency on-load tap changer optimization design system. Background Art

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

[0003] When designing low-frequency on-load tap changers, the existing technology has the following key problems: the selection of contact materials is not fully adapted to the special electric field distribution and arc pressure in the low-frequency environment, which may lead to early wear of the contacts and poor electrical contact, affecting the reliability and life of the switch; the determination of the number of parallel contacts ignores the relationship between the current carrying capacity of the contact material and the contact area, resulting in uneven current density distribution, increased thermal stress and arc instability; and the optimization of the vacuum tube lever structure is not sufficient, and the precise analysis of stress distribution under dynamic load is not considered, and the mechanical strength and wear resistance of the material are not well considered, resulting in the lever being easily deformed and worn 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 purpose of the present application is to 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, so as to at least solve the problem of low-frequency on-load tap changer service life caused by unreasonable design of contacts and vacuum tube levers of low-frequency on-load tap changer in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present 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 of the low-frequency on-load tap changer, the electric field simulation model being used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer, the contacts comprising main contacts, transition contacts and fixed contacts, the contact areas being the surface areas where current transmission occurs between the contacts and other electrical components, 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 the switch operation, the vacuum tube lever being 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 according to the electric field simulation model, and determining the number of the contacts in parallel according to the conductivity of the manufacturing material of the contacts; and optimizing the structure of the vacuum tube lever according to the vacuum tube lever model.

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

[0007] Optionally, determining the number of contacts connected in parallel according to the conductivity of the material of which the contacts are made comprises: calculating the current density J of the contacts according to the electric field strength of the contact area and the material of which the contacts are made c =σ·E c , where σ is the conductivity of the material of the contact; the carrying current I of the contact is calculated according to 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 parallel connections of the contacts is determined according to the carrying current of the contacts Among them, I t is the load current that the low-frequency on-load tap changer needs to carry.

[0008] Optionally, optimizing the structure of the vacuum tube lever according to 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 a switch operation, 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 is the external load acting on the vacuum tube lever, A is the force-bearing area of ​​the vacuum tube lever that bears the external load; and whether the vacuum tube lever undergoes plastic deformation is determined based on the stress.

[0009] Optionally, judging whether the vacuum tube lever undergoes plastic deformation is based on the stress, including: when the stress of the vacuum tube lever is greater than the yield strength, determining that the vacuum tube lever undergoes plastic deformation, adjusting the structure of the vacuum tube lever, the yield strength being the minimum stress value for the vacuum tube lever to undergo plastic deformation; and when the stress of the vacuum tube lever is less than the yield strength, determining that the vacuum tube lever does not undergo plastic deformation.

[0010] Optionally, adjusting the structure of the vacuum tube lever includes: increasing the stress 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] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a low-frequency on-load tap changer optimization design device is provided, comprising: a first establishing unit, 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 contact and the contact area of ​​the low-frequency on-load tap changer, the contact comprises a main contact, a transition contact and a fixed contact, the contact area is the surface area where current transmission occurs between the contact 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 switch operation, the vacuum tube lever is a mechanical component that drives the vacuum tube to open and close; a first determining unit, used to determine the manufacturing material of the contact of the low-frequency on-load tap changer according to the electric field simulation model, and determine the parallel number of the contact according to the conductivity of the manufacturing material of the contact; a first optimizing unit, used to optimize the structure of the vacuum tube lever according to the vacuum tube lever model.

[0012] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the method described in any one of the devices where the computer-readable storage medium is located is controlled.

[0013] According to another aspect of the present application, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, any one of the methods described above is implemented.

[0014] According to another aspect of the present 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 are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the methods described.

[0015] Applying the technical solution of the present application, in the above-mentioned method for optimizing the design of a low-frequency on-load tap changer, the method includes: 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 being used to analyze the electric field distribution inside the contacts and their contact areas of the low-frequency on-load tap changer, the contacts comprising main contacts, transition contacts and fixed contacts, the contact areas being the surface areas where current transmission occurs between the contacts and other electrical components, 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 the switch operation, the vacuum tube lever being 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 according to the electric field simulation model, and determining the number of the contacts in parallel according to the conductivity of the manufacturing material of the contacts; and optimizing the structure of the vacuum tube lever according to the vacuum tube lever model. The present 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 contacts in parallel of the low-frequency on-load tap changer, establishes a vacuum tube lever model, optimizes the design of the vacuum tube lever structure of the low-frequency on-load tap changer, and improves the arc control capability and mechanical strength of the low-frequency on-load tap changer through the optimized design of the contacts and the vacuum tube lever, thereby solving the problem of low service life of the low-frequency on-load tap changer caused by unreasonable design of the contacts and the vacuum tube lever of the low-frequency on-load tap changer in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for executing a low-frequency on-load tap changer optimization design method provided in an embodiment of the present application is shown;

[0017] Figure 2A schematic flow chart of a low-frequency on-load tap changer optimization design method provided according to an embodiment of the present 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 the present application is shown.

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

[0020] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] As introduced in the background technology, the prior art does not fully consider the design of the contacts and vacuum tube levers of the low-frequency on-load tap changer, resulting in a greatly reduced service life of the low-frequency on-load tap changer. To solve this technical problem, the embodiments of the present application provide a low-frequency on-load tap changer optimization design method, a design device, a computer-readable storage medium, a computer program product and a low-frequency on-load tap changer optimization design system.

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

[0026] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal of a low-frequency on-load tap changer optimization design method according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0027] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as a computer program corresponding to a low-frequency on-load tap changer optimization design method in an embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. The transmission device 106 is used to receive or send data via a network. The above network specific examples may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as 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] In this embodiment, a low-frequency on-load tap changer optimization design method running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of 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 can be executed in an order different from that shown here.

[0029] Figure 2 FIG. 1 is a flow chart of a method for optimizing the design of a low-frequency on-load tap changer according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0030] Step S201, establishing an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer, wherein 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, wherein the contacts include main contacts, transition contacts and fixed contacts, wherein the contact area is a surface area where current transmission occurs between the contacts and other electrical components, and 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 switch operation, wherein 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 surface area between the main contacts, transition contacts and fixed contacts and other electrical components in the switch, while the vacuum tube lever model focuses on studying the mechanical properties of the mechanical components that drive the opening and closing of the vacuum tube during the 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 can help us understand the strength and distribution of the electric field between the contacts, which is important for optimizing the design of the contacts and better preventing arc generation based on the optimized design. The vacuum tube lever model enables us to optimize the vacuum tube lever, which is crucial to improving the reliability and life of the switch.

[0032] Step S202, determining the manufacturing material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and determining the number of the contacts to be connected in parallel according to the conductivity of the manufacturing material of the contacts;

[0033] Specifically, the results of the electric field simulation model are used to select suitable materials to manufacture the contacts of the low-frequency on-load tap changer, and the number of parallel configurations of these contacts is determined based on the electrical 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 electrical conductivity of these materials, we calculate the optimal number of contacts in parallel to achieve the required electrical performance.

[0034] Step S203, optimizing the structure of the vacuum tube lever according to the vacuum tube lever model.

[0035] Specifically, a vacuum tube lever model is used to perform 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 magnitude of the stress, thereby reducing the risk of failure and improving the safety of switch operation.

[0036] Through this embodiment, in the above-mentioned low-frequency on-load tap changer optimization design method, an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer are established, the above-mentioned electric field simulation model is used to analyze the electric field distribution inside the contact and the contact area of ​​the above-mentioned low-frequency on-load tap changer, the above-mentioned contact includes a main contact, a transition contact and a fixed contact, the above-mentioned contact area is a surface area where current transmission occurs between the above-mentioned contact and other electrical components, and the above-mentioned vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the above-mentioned low-frequency on-load tap changer during the switch operation process, and the above-mentioned vacuum tube lever is a mechanical component that drives the vacuum tube to open and close the action; the manufacturing material of the above-mentioned contact of the above-mentioned low-frequency on-load tap changer is determined according to the above-mentioned electric field simulation model, and the parallel number of the above-mentioned contacts is determined according to the conductivity of the above-mentioned manufacturing material of the above-mentioned contact; the structure of the above-mentioned vacuum tube lever is optimized according to the above-mentioned vacuum tube lever model. The present 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 contacts in parallel of the low-frequency on-load tap changer, establishes a vacuum tube lever model, optimizes the design of the vacuum tube lever structure of the low-frequency on-load tap changer, and improves the arc control capability and mechanical strength of the low-frequency on-load tap changer through the optimized design of the contacts and the vacuum tube lever, thereby solving the problem of low service life of the low-frequency on-load tap changer caused by unreasonable design of the contacts and the vacuum tube lever of the low-frequency on-load tap changer in the prior art.

[0037] In order to determine the material for manufacturing the low-frequency on-load tap changer, in an optional implementation, the electric field strength of the contact area of ​​the contact is determined according to the electric field simulation model, and the step S202 includes:

[0038] Step S2021, determining the electric field strength of the contact area of ​​the contact according to the electric field simulation model;

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

[0040] Step S2022, calculating the minimum breakdown voltage V of the contact area according to the electric field strength of the contact area and the contact spacing of the contacts. b =E c ×d, where E c is the electric field strength of the contact area, d is the contact spacing of the contacts, the contact spacing is the minimum physical distance between the contacts and adjacent electrical components, and the minimum breakdown voltage is the minimum voltage threshold at which electrical breakdown occurs between the contact area of ​​the contacts and adjacent electrical components;

[0041] Specifically, we calculate the minimum breakdown voltage of the contact area based on the electric field strength in the contact area and the minimum physical distance between the contacts. This calculation result reflects the lowest voltage threshold for electrical breakdown between the contact and its adjacent electrical components. Through this calculation, a more accurate risk assessment can be achieved, which helps to optimize the contact material to improve insulation performance.

[0042] Step S2023, selecting a material with an electrical strength greater than the minimum breakdown voltage as the manufacturing material of the contact, wherein the electrical strength is the maximum voltage value that the electrical insulating material can withstand under the action of an electric field.

[0043] Specifically, insulating materials with electrical strength exceeding the calculated minimum breakdown voltage are selected to manufacture contacts. Materials with high electrical strength can provide better protection. Through this material selection strategy, it can be ensured that the electrical performance of the contact material in actual application meets safety requirements, reducing the risk of failure due to material breakdown and enhancing the durability and safety of the equipment.

[0044] In order to determine the number of contacts connected in parallel, in an optional implementation manner, the number of contacts connected in parallel is determined according to the conductivity of the material of the contacts, and the step S202 further includes:

[0045] Step S2024, calculating the current density J of the contact according to the electric field strength of the contact area and the material of the contact c =σ·E c , where σ is the electrical conductivity of the material of the contact;

[0046] Specifically, the current density of the contact can be calculated based on the electric field strength in the contact area of ​​the contact and the conductivity of the material used. Current density refers to the current passing through a unit area, while conductivity is a measure of the 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 later.

[0047] Step S2025, calculating the carrying current I of the contact according to the current density of the contact c =J c ×S, where S is the area of ​​the contact region of the 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. The calculation results can guide the design of the contact to ensure that the contact can meet specific current transmission requirements.

[0049] Step S2026, determining the number of the contacts to be connected in parallel according to the carrying current of the contacts Among them, I t It is the load current that the above-mentioned low-frequency on-load tap-changer needs to carry.

[0050] Specifically, the required number of contacts in parallel is determined based on the current that the contacts can carry and the load current that the switch needs to carry. Through this configuration, it can be ensured 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 in parallel helps to achieve uniform current distribution and reduce the risk of overheating or damage of a single contact due to excessive current, thereby improving the stability and life of the entire switch system.

[0051] In order to optimize the vacuum tube lever, in an optional implementation, the structure of the vacuum tube lever is optimized according to the vacuum tube lever model, and the step S203 includes:

[0052] Step S2031, applying an external load to the vacuum tube lever model according to actual working conditions, the external load comprising 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 a switch operation, and the spring force being the pressure applied to the vacuum tube lever by a 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 external loads, we can more accurately simulate and analyze the mechanical influences on the vacuum tube lever in actual operation, thereby optimizing its structural design.

[0054] Step S2032, calculating the stress of the vacuum tube lever model under the external load where f y is the external load acting on the vacuum tube lever, and A is the force bearing 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. Stress is the ratio of 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 geometry and material selection of the lever to improve its load-bearing capacity and durability.

[0056] Step S2033, judging whether the vacuum tube lever undergoes plastic deformation according to the stress.

[0057] Specifically, by evaluating the stress level of the vacuum tube lever under the influence of external load, it is determined whether it has reached the conditions for plastic deformation. Through this stress evaluation, it is possible to predict whether the vacuum tube lever will undergo irreversible deformation due to excessive stress in actual work.

[0058] In order to determine whether the vacuum tube lever undergoes plastic deformation, in an optional implementation, determining whether the vacuum tube lever undergoes plastic deformation according to the stress, the step S2033 includes:

[0059] Step S20331, when the stress of the vacuum tube lever is greater than the yield strength, determining that the vacuum tube lever undergoes plastic deformation, adjusting the structure of the vacuum tube lever, and the yield strength is the minimum stress value for the vacuum tube lever to undergo plastic deformation;

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

[0061] Step S20332: When the stress of the vacuum tube lever is less than the yield strength, determine that no plastic deformation occurs to the vacuum tube lever.

[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, which means that the lever material remains within the elastic range under the force applied and no permanent damage occurs.

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

[0064] Step S2033101, increasing the stress-bearing area of ​​the vacuum tube lever where the stress is greater than the yield strength;

[0065] Specifically, for the area of ​​the vacuum tube lever where the stress level exceeds the yield strength, we reduce the magnitude of the stress by increasing the area of ​​the force-bearing area. Such adjustments help to disperse the stress, ensure that the material works at 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, adjusting the material of the vacuum tube lever to a material whose yield strength is 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. Such material replacement can ensure that the lever will not reach the critical point of plastic deformation under any working condition, improve the overall load-bearing capacity of the lever, and reduce the risk of structural damage caused by material yield, thereby improving the durability of the switch.

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

[0069] The embodiment of the present application also provides a low-frequency on-load tap changer optimization design device. It should be noted that the low-frequency on-load tap changer optimization design device of the embodiment of the present application can be used to execute the low-frequency on-load tap changer optimization design method provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0070] The following is an introduction to a low-frequency on-load tap changer optimization design device provided in an embodiment of the present application.

[0071] Figure 3 1 is a structural block diagram of a low-frequency on-load tap changer optimization design device according to an embodiment of the present application. Figure 3 As shown, the device comprises:

[0072] The first establishing unit 10 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 contact and the contact area of ​​the low-frequency on-load tap changer. The contact includes a main contact, a transition contact and a fixed contact. The contact area is a surface area where current transmission occurs between the contact 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 switch operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to open and close.

[0073] Specifically, the electric field simulation model aims to explore the electric field distribution in the contact surface area between the main contacts, transition contacts and fixed contacts and other electrical components in the switch, while the vacuum tube lever model focuses on studying the mechanical properties of the mechanical components that drive the opening and closing of the vacuum tube during the 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 can help us understand the strength and distribution of the electric field between the contacts, which is important for optimizing the design of the contacts and better preventing arc generation based on the optimized design. The vacuum tube lever model enables us to optimize the vacuum tube lever, which is crucial to improving the reliability and life of the switch.

[0074] A first determining unit 20 is used to determine a 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 the contacts to be connected in parallel according to the conductivity of the manufacturing material of the contacts;

[0075] Specifically, the results of the electric field simulation model are used to select suitable materials to manufacture the contacts of the low-frequency on-load tap changer, and the number of parallel configurations of these contacts is determined based on the electrical 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 electrical 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 to perform 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 magnitude of the stress, thereby reducing the risk of failure and improving the safety of switch operation.

[0078] Through 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 above-mentioned electric field simulation model is used to analyze the electric field distribution inside the contact and the contact area of ​​the above-mentioned low-frequency on-load tap changer. The above-mentioned contact includes a main contact, a transition contact and a fixed contact. The above-mentioned contact area is a surface area where current transmission occurs between the above-mentioned contact and other electrical components. The above-mentioned vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the above-mentioned low-frequency on-load tap changer during the switch operation process. The above-mentioned vacuum tube lever is a mechanical component that drives the vacuum tube to open and close the action; the first determining unit is used to determine the manufacturing material of the above-mentioned contact of the above-mentioned low-frequency on-load tap changer according to the above-mentioned electric field simulation model, and determine the parallel number of the above-mentioned contacts according to the conductivity of the above-mentioned manufacturing material of the above-mentioned contact; the first optimizing unit is used to optimize the structure of the above-mentioned vacuum tube lever according to the above-mentioned vacuum tube lever model. The present 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 contacts in parallel of the low-frequency on-load tap changer, establishes a vacuum tube lever model, optimizes the design of the vacuum tube lever structure of the low-frequency on-load tap changer, and improves the arc control capability and mechanical strength of the low-frequency on-load tap changer through the optimized design of the contacts and the vacuum tube lever, thereby solving the problem of low service life of the low-frequency on-load tap changer caused by unreasonable design of the contacts and the vacuum tube lever of the low-frequency on-load tap changer in the prior art.

[0079] In order to determine the material for manufacturing the low-frequency on-load tap changer, in an optional implementation manner, the electric field strength of the contact area of ​​the contact is determined according to the electric field simulation model, and the first determination unit includes:

[0080] A first determining subunit, configured 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 of ​​the low-frequency on-load tap changer is determined based on the data obtained from the electric field simulation model. In this way, we can accurately obtain the electric field strength of the contact area, and judge whether the contact area of ​​the contact meets the working requirements based on the electric field strength. If it does not meet the requirements, the structure of the contact is adjusted to improve the performance and reliability of the switch.

[0082] The second determination subunit is used to calculate the minimum breakdown voltage V of the contact area according to the electric field strength of the contact area and the contact spacing of the contacts. b =E c ×d, where E cis the electric field strength of the contact area, d is the contact spacing of the contacts, the contact spacing is the minimum physical distance between the contacts and adjacent electrical components, and the minimum breakdown voltage is the minimum voltage threshold at which electrical breakdown occurs between the contact area of ​​the contacts and adjacent electrical components;

[0083] Specifically, we calculate the minimum breakdown voltage of the contact area based on the electric field strength in the contact area and the minimum physical distance between the contacts. This calculation result reflects the lowest voltage threshold for electrical breakdown between the contact and its adjacent electrical components. Through this calculation, a more accurate risk assessment can be achieved, which helps to optimize the contact material to improve insulation performance.

[0084] The third determination subunit is used to select a material with an electrical strength greater than the minimum breakdown voltage as the manufacturing material of 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.

[0085] Specifically, insulating materials with electrical strength exceeding the calculated minimum breakdown voltage are selected to manufacture contacts. Materials with high electrical strength can provide better protection. Through this material selection strategy, it can be ensured that the electrical performance of the contact material in actual application meets safety requirements, reducing the risk of failure due to material breakdown and enhancing the durability and safety of the equipment.

[0086] In order to determine the number of contacts connected in parallel, in an optional implementation manner, the number of contacts connected in parallel is determined according to the conductivity of the material of the contacts, and the first determination unit further includes:

[0087] The fourth determination subunit is used to calculate the current density J of the contact according to the electric field strength of the contact area and the material of the contact. c =σ·E c , where σ is the electrical conductivity of the material of the contact;

[0088] Specifically, the current density of the contact can be calculated based on the electric field strength in the contact area of ​​the contact and the conductivity of the material used. Current density refers to the current passing through a unit area, while conductivity is a measure of the 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 later.

[0089] The fifth determining subunit is used to calculate the carrying current I of the contact according to the current density of the contact. c =J c ×S, where S is the area of ​​the contact region of the 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. The calculation results can guide the design of the contact to ensure that the contact can meet specific current transmission requirements.

[0091] A sixth determining subunit, configured to determine the parallel connection quantity of the contacts according to the carrying current of the contacts Among them, I t It is the load current that the above-mentioned low-frequency on-load tap-changer needs to carry.

[0092] Specifically, the required number of contacts in parallel is determined based on the current that the contacts can carry and the load current that the switch needs to carry. Through this configuration, it can be ensured 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 in parallel helps to achieve uniform current distribution and reduce the risk of overheating or damage of a single contact due to excessive current, thereby improving the stability and life of the entire switch system.

[0093] In order to optimize the vacuum tube lever, in an optional implementation manner, the structure of the vacuum tube lever is optimized according to the vacuum tube lever model, and the first optimization unit includes:

[0094] A first optimization subunit is used to apply an external load to the vacuum tube lever model according to actual working conditions, wherein the external load includes a vacuum tube self-closing force and a spring force, wherein the vacuum tube self-closing force is a closing force provided by the vacuum tube lever during a switch operation, and the spring force is a pressure applied to the vacuum tube lever by a 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 external loads, we can more accurately simulate and analyze the mechanical influences on the vacuum tube lever in actual operation, thereby optimizing its structural design.

[0096] The second optimization subunit is used to calculate the stress of the above vacuum tube lever model under the above external load where f y is the external load acting on the vacuum tube lever, and A is the force bearing 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. Stress is the ratio of 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 geometry and material selection of the lever to improve its load-bearing capacity and durability.

[0098] The third optimization subunit is used to determine whether the vacuum tube lever undergoes plastic deformation according to the stress.

[0099] Specifically, by evaluating the stress level of the vacuum tube lever under the influence of external load, it is determined whether it has reached the conditions for plastic deformation. Through this stress evaluation, it is possible to predict whether the vacuum tube lever will undergo irreversible deformation due to excessive stress in actual work.

[0100] In order to determine whether the vacuum tube lever undergoes plastic deformation, in an optional implementation, determining whether the vacuum tube lever undergoes plastic deformation according to the stress, the third optimization subunit includes:

[0101] A first optimization module is used to determine that the vacuum tube lever undergoes plastic deformation and adjust the structure of the vacuum tube lever when the stress of the vacuum tube lever is greater than the yield strength, and the yield strength is a minimum stress value for the vacuum tube lever to undergo plastic deformation;

[0102] When the calculated stress on the vacuum tube lever exceeds its yield strength, we regard it as having undergone plastic deformation. The yield strength refers to the stress threshold at which the material begins to undergo plastic deformation. After confirming that the 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 does not undergo 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, which means that the lever material remains within the elastic range under the force applied and no permanent damage occurs.

[0105] In order to optimize the structure of the vacuum tube lever, in an optional implementation, the structure of the vacuum tube lever is adjusted, and the first optimization module includes:

[0106] A first optimization submodule, used for increasing the stress-bearing area of ​​the vacuum tube lever where the stress is greater than the yield strength;

[0107] Specifically, for the area of ​​the vacuum tube lever where the stress level exceeds the yield strength, we reduce the magnitude of the stress by increasing the area of ​​the force-bearing area. Such adjustments help to disperse the stress, ensure that the material works at 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 whose yield strength is 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. Such material replacement can ensure that the lever will not reach the critical point of plastic deformation under any working condition, improve the overall load-bearing capacity of the lever, and reduce the risk of structural damage caused by material yield, thereby improving the durability of the switch.

[0110] The above-mentioned low-frequency on-load tap changer optimization design device includes a processor and a memory, and the above-mentioned first establishing unit, the first determining unit and the first optimizing unit are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions. The above-mentioned modules are all located in the same processor; or, the above-mentioned modules are respectively located in different processors in the form of any combination.

[0111] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the structure of the low-frequency on-load tap changer can be more accurately optimized by adjusting the kernel parameters.

[0112] The memory may include non-permanent memory in a computer-readable medium, 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] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the above-mentioned low-frequency on-load tap changer optimization design method.

[0114] Specifically, a low-frequency on-load tap changer optimization design method includes:

[0115] Step S201, establishing an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer, wherein 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, wherein the contacts include main contacts, transition contacts and fixed contacts, wherein the contact area is a surface area where current transmission occurs between the contacts and other electrical components, and 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 switch operation, wherein the vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions;

[0116] Step S202, determining the manufacturing material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and determining the number of the contacts to be connected in parallel according to the conductivity of the manufacturing material of the contacts;

[0117] Step S203, optimizing the structure of the vacuum tube lever according to the vacuum tube lever model.

[0118] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the program executes the above-mentioned low-frequency on-load tap changer optimization design method when running.

[0119] Specifically, a low-frequency on-load tap changer optimization design method includes:

[0120] Step S201, establishing an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer, wherein 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, wherein the contacts include main contacts, transition contacts and fixed contacts, wherein the contact area is a surface area where current transmission occurs between the contacts and other electrical components, and 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 switch operation, wherein the vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions;

[0121] Step S202, determining the manufacturing material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and determining the number of the contacts to be connected in parallel according to the conductivity of the manufacturing material of the contacts;

[0122] Step S203, optimizing the structure of the vacuum tube lever according to the vacuum tube lever model.

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

[0124] Step S201, establishing an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer, wherein 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, wherein the contacts include main contacts, transition contacts and fixed contacts, wherein the contact area is a surface area where current transmission occurs between the contacts and other electrical components, and 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 switch operation, wherein the vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions;

[0125] Step S202, determining the manufacturing material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and determining the number of the contacts to be connected in parallel according to the conductivity of the manufacturing material of the contacts;

[0126] Step S203, optimizing the structure of the vacuum tube lever according to the vacuum tube lever model.

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

[0128] Specifically, a low-frequency on-load tap changer optimization design method includes:

[0129] Step S201, establishing an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer, wherein 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, wherein the contacts include main contacts, transition contacts and fixed contacts, wherein the contact area is a surface area where current transmission occurs between the contacts and other electrical components, and 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 switch operation, wherein the vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions;

[0130] Step S202, determining the manufacturing material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and determining the number of the contacts to be connected in parallel according to the conductivity of the manufacturing material of the contacts;

[0131] Step S203, optimizing the structure of the vacuum tube lever according to the vacuum tube lever model.

[0132] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0133] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0134] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0135] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0136] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function 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] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0139] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules 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 technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0140] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0141] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0142] 1) A method for optimizing the design of a low-frequency on-load tap changer of the present application is provided, wherein an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer are established, wherein the electric field simulation model is used to analyze the electric field distribution inside the contacts of the low-frequency on-load tap changer and in their contact areas, wherein the contacts include main contacts, transition contacts and fixed contacts, wherein the contact areas are surface areas where current transmission occurs between the contacts and other electrical components, and wherein 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 switch operation, wherein the vacuum tube lever is a mechanical component that drives the vacuum tube to perform opening and closing actions; the manufacturing material of the contacts of the low-frequency on-load tap changer is determined according to the electric field simulation model, and the number of the contacts connected in parallel is determined according to the conductivity of the manufacturing material of the contacts; and the structure of the vacuum tube lever is optimized according to the vacuum tube lever model. The present 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 contacts in parallel of the low-frequency on-load tap changer, establishes a vacuum tube lever model, optimizes the design of the vacuum tube lever structure of the low-frequency on-load tap changer, and improves the arc control capability and mechanical strength of the low-frequency on-load tap changer through the optimized design of the contacts and the vacuum tube lever, thereby solving the problem of low service life of the low-frequency on-load tap changer caused by unreasonable design of the contacts and the vacuum tube lever of the low-frequency on-load tap changer in the prior art.

[0143] 2) A low-frequency on-load tap changer optimization design device of the present application, a first establishing unit, used to establish an electric field simulation model and a vacuum tube lever model of the low-frequency on-load tap changer, the above-mentioned electric field simulation model is used to analyze the electric field distribution inside the contacts and their contact areas of the above-mentioned low-frequency on-load tap changer, the above-mentioned contacts include main contacts, transition contacts and fixed contacts, the above-mentioned contact area is the surface area where current transmission occurs between the above-mentioned contacts and other electrical components, the above-mentioned vacuum tube lever model is used to analyze the mechanical behavior of the vacuum tube lever of the above-mentioned low-frequency on-load tap changer during the switch operation process, and the above-mentioned vacuum tube lever is a mechanical component that drives the vacuum tube to open and close the action; the first determining unit is used to determine the manufacturing material of the above-mentioned contacts of the above-mentioned low-frequency on-load tap changer according to the above-mentioned electric field simulation model, and determine the parallel number of the above-mentioned contacts according to the conductivity of the above-mentioned manufacturing material of the above-mentioned contacts; the first optimizing unit is used to optimize the structure of the above-mentioned vacuum tube lever according to the above-mentioned vacuum tube lever model. The present 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 contacts in parallel of the low-frequency on-load tap changer, establishes a vacuum tube lever model, optimizes the design of the vacuum tube lever structure of the low-frequency on-load tap changer, and improves the arc control capability and mechanical strength of the low-frequency on-load tap changer through the optimized design of the contacts and the vacuum tube lever, thereby solving the problem of low service life of the low-frequency on-load tap changer caused by unreasonable design of the contacts and the vacuum tube lever of the low-frequency on-load tap changer in the prior art.

[0144] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low-frequency on-load tap changer optimization design method, 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 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 transmission occurs 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 switch operation. The vacuum tube lever is a mechanical component that drives the vacuum tube to open and close. Determining the manufacturing material of the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and determining the number of the contacts connected in parallel according to the conductivity of the manufacturing material of the contacts; The structure of the vacuum tube lever is optimized according to the vacuum tube lever model.

2. The method according to claim 1, characterized in that Determining the manufacturing material of the contact of the low-frequency on-load tap changer according to the electric field simulation model includes: Determining the electric field strength of the contact area of ​​the contact according to the electric field simulation model; According to the electric field strength of the contact area and the contact spacing of the contacts, the minimum breakdown voltage V of the contact area is calculated. b =E c ×d, where E c is the electric field strength of the contact area, d is the contact spacing of the contacts, the contact spacing is the minimum physical distance between the contacts and adjacent electrical components, and the minimum breakdown voltage is the lowest voltage threshold at which electrical breakdown occurs between the contact area of ​​the contacts and adjacent electrical components; A material with an electrical strength greater than the minimum breakdown voltage is selected as the manufacturing material of the contact, and the electrical strength is the maximum voltage value that the electrical insulating material can withstand under the action of an electric field.

3. The method according to claim 2, characterized in that Determining the number of the contacts connected in parallel according to the conductivity of the material of which the contacts are made comprises: The current density J of the contact is calculated based on the electric field strength of the contact area and the material of the contact. c =σ·E c , where σ is the electrical conductivity of the material of which the contact is made; The carrying current I of the contact is calculated according to the current density of the contact. c =J c ×S, where S is the area of ​​the contact region of the contact; Determine the number of contacts connected in parallel according to the carrying current of the contacts Among them, I t is the load current that the low-frequency on-load tap changer needs to carry.

4. The method according to claim 1, characterized in that: Optimizing the structure of the vacuum tube lever according to the vacuum tube lever model includes: Apply an external load to the vacuum tube lever model according to actual working conditions, wherein the external load includes a vacuum tube self-closing force and a spring force, wherein the vacuum tube self-closing force is a closing force provided by the vacuum tube lever during a switch operation, and the spring force is a pressure applied to the vacuum tube lever by a spring; Calculate the stress of the vacuum tube lever model under the external load where f y is the external load acting on the vacuum tube lever, and A is the force bearing area of ​​the vacuum tube lever bearing the external load; Whether the vacuum tube lever undergoes plastic deformation is determined based on the stress.

5. The method according to claim 4, characterized in that Judging whether the vacuum tube lever has plastic deformation according to the stress includes: In the case where the stress of the vacuum tube lever is greater than the yield strength, it is determined that the vacuum tube lever undergoes plastic deformation, and the structure of the vacuum tube lever is adjusted, wherein the yield strength is the minimum stress value for the vacuum tube lever to undergo plastic deformation; When 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.

6. The method according to claim 5, characterized in that Adjusting the structure of the vacuum tube lever includes: Increase the stress-bearing area of ​​the vacuum tube lever where the stress is greater than the yield strength; and / or adjust the material of the vacuum tube lever to a material where the yield strength is greater than the stress.

7. A low-frequency on-load tap changer optimization design device, characterized in that: include: A first establishing unit is used to establish an electric field simulation model and a vacuum tube lever model of a low-frequency on-load tap changer, wherein the electric field simulation model is used to analyze the electric field distribution inside the contact and the contact area of ​​the low-frequency on-load tap changer, wherein the contact includes a main contact, a transition contact and a fixed contact, wherein the contact area is a surface area where current transmission occurs between the contact and other electrical components, and wherein 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 switch operation process, wherein the vacuum tube lever is a mechanical component that drives the vacuum tube to perform an opening and closing action; a first determining unit, configured to determine a material for making the contacts of the low-frequency on-load tap changer according to the electric field simulation model, and determine a number of the contacts to be connected in parallel according to the conductivity of the material for making the contacts; The first optimization unit is used to optimize the structure of the vacuum tube lever according to the vacuum tube lever model.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. 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 are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 6.

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