Method and device for selecting parameters of frequency divider disconnector

Abstract

This application provides a method and apparatus for selecting parameters of a frequency-division decoy. The method includes obtaining initial physical parameters; performing electric field and magnetic field calculations on the initial physical parameters to obtain electromagnetic parameters, and calculating heat source terms and electromagnetic forces based on the electromagnetic parameters, including electric field strength, current density, and magnetic field strength; simultaneously solving the energy conservation equation, mass conservation equation, and momentum conservation equation under temperature field boundary conditions and flow field boundary conditions using the heat source terms and electromagnetic forces to obtain the temperature field, velocity field, and pressure field; and selecting target parameters of the frequency-division decoy based on the temperature field, velocity field, and pressure field, including the discharge gap distance, the inductance value of the frequency-division inductor, the spark gap distance, and the resistance value of the heating resistor. This application solves the problem of low decoy performance caused by the lack of systematic parameter selection for frequency-division decoys in the prior art.

Description

Technical Field

[0001] This invention relates to the field of disconnector technology, and more specifically, to a method, device, and computer-readable storage medium for selecting parameters of a frequency divider disconnector. Background Technology

[0002] The widespread application of disconnectors in power grid systems has accumulated rich experience, promoted the enrichment and improvement of disconnector types and functions, and pushed the manufacturing level of disconnectors to a new height. Currently, surge arresters operating in the power grid generally use compatible disconnectors. Based on their operating mode, the disconnectors used in existing metal oxide surge arresters can be divided into two main categories—thermal fusion disconnectors and thermal explosion disconnectors. In actual operation, thermal fusion disconnectors are prone to aging due to environmental factors such as humidity, leading to malfunctions or failure to operate. When the surge arrester current is very large, the disconnector needs to operate quickly; however, existing thermal fusion disconnectors, due to defects in their structural principle, cannot achieve this function, thus limiting their applicability. Thermal surge arresters rely on parallel devices. Resistive disconnectors often use conductive rubber, but it has obvious disadvantages. For example, conductive rubber is not resistant to arc burning, and long-term operation can easily form carbonized channels that lose resistance and generate heat, which may lead to failure to operate or false operation. When the capacitor breaks down, the gap of the capacitor disconnector will not be broken down and discharged again, so it cannot cause the thermal surge tube to operate.

[0003] The novel disconnector employs a dual-gap principle, utilizing inductive frequency division to withstand both lightning current and switching overcurrent, while also enabling rapid and reliable operation under very small power frequency currents. Based on the above analysis, the performance of the parallel components and the stability of the discharge gap (i.e., the absence of electrode erosion, breakdown voltage reduction, etc.) are the main factors determining the disconnector's performance. Therefore, the selection of the heating resistor and the determination of the gap distance are particularly important in the novel disconnector. Currently, research on novel frequency-divided disconnectors lacks systematic modeling and simulation analysis methods for parameter selection and principle verification. Summary of the Invention

[0004] The main objective of this application is to provide a method, device, and computer-readable storage medium for selecting parameters of a frequency divider disconnector, so as to at least solve the problem of poor disconnector performance caused by the lack of a systematic selection of parameters for frequency divider disconnectors in the prior art.

[0005] To achieve the above objectives, according to one aspect of this application, a method for selecting parameters of a frequency-division decoupler is provided, comprising: obtaining initial physical parameters, the initial physical parameters including at least initial temperature, air layer flow velocity, and initial pressure; performing electric field calculations and magnetic field calculations on the initial physical parameters to obtain electromagnetic parameters, and calculating a heat source term and an electromagnetic force based on the electromagnetic parameters, the electromagnetic parameters including electric field strength, current density, and magnetic field strength; simultaneously solving the energy conservation equation, mass conservation equation, and momentum conservation equation using the heat source term and the electromagnetic force under temperature field boundary conditions and flow field boundary conditions to obtain a temperature field, a velocity field, and a pressure field, the temperature field boundary condition being that the boundary heat source of the temperature field is Joule heating, and the flow field boundary condition allowing fluid in the flow field to freely enter and exit; selecting target parameters of the frequency-division decoupler based on the temperature field, the velocity field, and the pressure field, the target parameters including discharge gap distance, the inductance value of the frequency-division inductor, the spark gap distance, and the resistance value of the heating resistor.

[0006] Optionally, electric field and magnetic field calculations are performed on the initial physical parameters to obtain electromagnetic parameters, including: a first calculation step, coupling the electric and magnetic fields to simulate the electrostatic field within the frequency divider based on the initial physical parameters and performing electric field calculations to obtain the current electric field strength and current current density; a first judgment step, judging whether the current electric field strength and current current density both reach a first convergence condition, wherein the first convergence condition is that a first relative tolerance is less than a first set tolerance, the first relative tolerance being the relative tolerance after the current electric field calculation, the relative tolerance being used to measure the ratio of the difference between two iterations to the current value; and a first judgment step, judging whether the current electric field strength and current current density both reach a first convergence condition, wherein the first convergence condition is that a first relative tolerance is less than a first set tolerance, the first relative tolerance being the relative tolerance after the current electric field calculation, the relative tolerance being used to measure the ratio of the difference between two iterations to the current value; and a first judgment step, judging whether the current electric field strength and current current density both reach a first convergence condition, wherein the current electric field strength and current current density both reach a first convergence condition, wherein the current electric field strength and current current density both reach a first convergence condition, and a first convergence condition is that the current electric field strength and current current density both reach a first convergence condition, wherein the current electric field strength and current current current density both reach a first convergence condition, and a first convergence condition is that the current electric field strength and current ... If the current density reaches the first convergence condition, the current electric field strength is determined as the electric field strength, and the current current density is determined as the current density; in the second calculation step, the electric field and magnetic field are coupled to simulate the magnetic field of the frequency divider decoupler according to the initial physical parameters and perform magnetic field calculation to obtain the current magnetic field strength; in the second judgment step, it is determined whether the current magnetic field strength reaches the second convergence condition, the second convergence condition being that the second relative tolerance is less than the second set tolerance, the second relative tolerance being the relative tolerance after the current magnetic field calculation; if the current magnetic field strength reaches the second convergence condition, the current magnetic field strength is determined as the magnetic field strength.

[0007] Optionally, after determining whether the current electric field strength and the current current density both reach the first convergence condition, the method further includes: if the current electric field strength and / or the current current density do not reach the first convergence condition, repeating the first calculation step and the first determination step until the current electric field strength and the current current density both reach the first convergence condition, determining the current electric field strength as the electric field strength, and determining the current current density as the current density.

[0008] Optionally, after determining whether the current magnetic field strength has reached the second convergence condition, the method further includes: if the current magnetic field strength has not reached the second convergence condition, repeating the second calculation step and the second determination step until the current magnetic field strength reaches the second convergence condition, and determining the current magnetic field strength as the magnetic field strength.

[0009] Optionally, calculating the heat source term and electromagnetic force based on the electromagnetic parameters includes: calculating all heat sources according to a first formula, and integrating all the heat sources to obtain the heat source term, wherein the first formula is: in, Q i The heat source is defined as the area within a unit volume per unit time, σ represents the conductivity inside the electric arc, J represents the current density, μ represents the magnetic permeability, and A represents the magnetic vector potential; the electromagnetic force is obtained by calculating the product between the current density and the magnetic field strength.

[0010] Optionally, by using the heat source term and the electromagnetic force under temperature field boundary conditions and flow field boundary conditions to simultaneously solve the energy conservation equation, mass conservation equation, and momentum conservation equation, the temperature field, velocity field, and pressure field are obtained. This includes: when the fluid is incompressible, simultaneously solving the energy conservation equation, the mass conservation equation, and the momentum conservation equation to obtain the temperature field, the velocity field, and the pressure field. The energy conservation equation is... Where ρ represents density, c p Let represent specific heat capacity, u represent velocity vector, T represent the temperature field, k represent thermal conductivity, Q represent the heat source term, and the mass conservation equation be: The momentum conservation equation is: Where λ is viscosity, f represents the volume force of the fluid, and P represents the pressure field.

[0011] Optionally, the discharge gap distance and the spark gap distance are selected based on empirical data from the temperature field, the velocity field, and the pressure field. The empirical data is a set of data obtained through multiple breakdown tests. The breakdown voltage is obtained by substituting the discharge gap distance or the spark gap distance into an empirical formula, and the resistance value of the heating resistor is calculated based on the breakdown voltage. The empirical formula is U = a + bD, where U represents the breakdown voltage and D represents the discharge gap distance or the spark gap distance. The inductance value of the frequency divider inductor is calculated based on the resistance value of the heating resistor.

[0012] Optionally, after selecting the target parameters of the frequency divider disconnector based on the temperature field, the velocity field, and the pressure field, the method further includes: simulating the frequency divider disconnector in COMSOL simulation software based on the target parameters to obtain a first current response and a first voltage response; constructing a frequency divider disconnector simulation circuit and simulating the gap structure using the Mayr arc equation combined with the target parameters to obtain a second current response and a second voltage response, wherein the gap structure includes a spark gap and a discharge gap; determining that the target parameter selection is unreasonable and reselecting the target parameters of the frequency divider disconnector if the difference between the first current response and the second current response is greater than a first set difference and / or the difference between the first voltage response and the second voltage response is greater than a second set difference; and determining that the target parameter selection is reasonable if the difference between the first current response and the second current response is less than or equal to the first set difference and / or the difference between the first voltage response and the second voltage response is less than or equal to the second set difference.

[0013] According to another aspect of this application, a parameter selection device for a frequency-division decoy is provided. The device includes: an acquisition unit for acquiring initial physical parameters, the initial physical parameters including at least initial temperature, air layer flow velocity, and initial pressure; a calculation unit for performing electric field calculation and magnetic field calculation on the initial physical parameters to obtain electromagnetic parameters, and calculating a heat source term and electromagnetic force based on the electromagnetic parameters, the electromagnetic parameters including electric field strength, current density, and magnetic field strength; a solution unit for simultaneously solving the energy conservation equation, mass conservation equation, and momentum conservation equation using the heat source term and the electromagnetic force under temperature field boundary conditions and flow field boundary conditions to obtain a temperature field, velocity field, and pressure field, the temperature field boundary condition specifying that the boundary heat source of the temperature field is Joule heating, and the flow field boundary condition allowing fluid in the flow field to freely enter and exit; and a selection unit for selecting target parameters of the frequency-division decoy based on the temperature field, the velocity field, and the pressure field, the target parameters including at least the discharge gap distance, the inductance value of the frequency-division inductor, the spark gap distance, and the resistance value of the heating resistor.

[0014] 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 the device on which the computer-readable storage medium is located to perform any of the methods described.

[0015] Applying the technical solution of this application, in the method for selecting parameters of the frequency divider disconnector, firstly, initial physical parameters are obtained, including at least initial temperature, air layer flow velocity, and initial pressure; then, electric field and magnetic field calculations are performed on the initial physical parameters to obtain electromagnetic parameters, and heat source terms and electromagnetic forces are calculated based on the electromagnetic parameters, including electric field strength, current density, and magnetic field strength; subsequently, the energy conservation equation, mass conservation equation, and momentum conservation equation are solved simultaneously using the heat source terms and electromagnetic forces under temperature field boundary conditions and flow field boundary conditions to obtain the temperature field, velocity field, and pressure field. The temperature field boundary condition is that the boundary heat source of the temperature field is Joule heating, and the flow field boundary condition allows the fluid in the flow field to freely enter and exit; finally, the target parameters of the frequency divider disconnector are selected based on the temperature field, velocity field, and pressure field, including the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor. This application simulates the actual operation of a frequency-division decoupler in simulation software by utilizing the coupling of electric, magnetic, flow, and temperature fields. The temperature, velocity, and pressure fields are obtained, and the resistance values ​​of the heating resistor, the frequency-division inductor, and the discharge gap distance are determined and verified based on these fields. This application solves the problem of poor decoupler performance caused by the lack of systematic parameter selection in existing technologies. Attached Figure Description

[0016] Figure 1 A hardware block diagram of a mobile terminal for performing a method for selecting parameters of a frequency divider demultiplexer according to an embodiment of this application is shown.

[0017] Figure 2 A flowchart illustrating a method for selecting parameters of a frequency divider decoupler according to an embodiment of this application is shown.

[0018] Figure 3 A flowchart illustrating a specific method for selecting parameters of a frequency divider decoupler according to an embodiment of this application is shown.

[0019] Figure 4 A circuit diagram of a frequency divider disconnector provided according to an embodiment of this application is shown;

[0020] Figure 5 An coded diagram of a simulated electric arc provided according to an embodiment of this application is shown;

[0021] Figure 6 A structural block diagram of a frequency divider parameter selection device provided according to an embodiment of this application is shown.

[0022] The above figures include the following reference numerals:

[0023] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0028] Relative tolerance: measures the difference between the numerical solution and the true solution relative to the true solution.

[0029] As described in the background section, current research on novel frequency divider disconnectors lacks systematic modeling and simulation analysis methods for parameter selection and principle verification. To address the problem of low disconnector performance due to the lack of systematic parameter selection for frequency divider disconnectors, embodiments of this application provide a method, device, and computer-readable storage medium for selecting parameters of a frequency divider disconnector.

[0030] 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.

[0031] 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 implementing a method for selecting parameters of a frequency divider demultiplexer 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.

[0032] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the frequency divider parameter selection 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 may also include 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.

[0033] This embodiment provides a method for selecting parameters of a frequency divider 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. Furthermore, 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.

[0034] Figure 2 This is a flowchart of a method for selecting parameters of a frequency divider decoupler according to an embodiment of this application. For example... Figure 2 As shown, the method includes the following steps:

[0035] Step S201: Obtain initial physical parameters, which include at least initial temperature, air layer flow velocity, and initial pressure.

[0036] Specifically, the generation of an electric arc in reality is the result of the coupling of multiple fields: electric field, magnetic field, flow field, and temperature field. As a collection of charged particles, the initial temperature of the electric arc is one of the factors determining its conductivity. The conductivity and boundary conditions determine the distribution of current density, which in turn determines the strength of the magnetic field inside the arc. Electrothermal coupling generates Joule heating. The arc moves under the influence of internal and external magnetic fields, leading to energy transfer. This energy transfer, in turn, redistributes the temperature and pressure of the arc, generating new arcs. The Joule heating generated by the electric and magnetic fields determines the distribution of the internal heat source. The heat transfer equation is: Where k is the thermal conductivity, W / (m·℃); Q i The heat source per unit volume per unit time, W / m 3 ρ is the density of the object, kg / m³ 3 c represents the specific heat capacity, J / (kg·℃). Therefore, initial physical parameters can be obtained first to simulate the generation of an electric arc.

[0037] Step S202: Perform electric field calculation and magnetic field calculation on the above initial physical parameters to obtain electromagnetic parameters, and calculate the heat source term and electromagnetic force based on the above electromagnetic parameters. The above electromagnetic parameters include electric field strength, current density and magnetic field strength.

[0038] Specifically, such as Figure 3 As shown, the electric field strength and current density are calculated using the electric field calculation module under the initial physical parameters that satisfy the electromagnetic field boundary conditions. Simultaneously, the magnetic field strength is calculated using the magnetic field calculation module. After calculating the electric field strength, current density, and magnetic field strength, the heat source term and electromagnetic force are calculated based on these electromagnetic parameters. For the boundary conditions at the interface between two different media, a continuity boundary condition is required to ensure the continuity of the electric and magnetic fields at the interface. In the COMSOL simulation software, the Continuity option is selected when setting the electromagnetic field boundary conditions.

[0039] Step S203: Using the above heat source term and the above electromagnetic force, solve the energy conservation equation, mass conservation equation and momentum conservation equation simultaneously under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field. The above temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the above flow field boundary condition is that the fluid in the flow field is allowed to enter and exit freely.

[0040] Specifically, after calculating the above-mentioned heat source term and electromagnetic force, the flow field and temperature field are coupled with the electromagnetic field. The temperature field is also a calculation module in the COMSOL simulation software. In this invention, Joule heating is used as the heat source. The flow field is also a calculation module in the COMSOL simulation software to simulate the air domain under real conditions. The electromagnetic field couples with the temperature field, and the electric arc generates Joule heating under the influence of both electric and magnetic fields. The internal heat source of the arc depends on Joule heating. The electromagnetic field couples with the flow field, and the electric arc moves under the combined action of internal and external magnetic fields, resulting in energy transfer. The temperature field and flow field couple with the electromagnetic field, and the flow velocity can affect the magnetic field strength by changing the current density. Temperature can change a series of thermodynamic properties (e.g., specific heat capacity) and affect the electromagnetic field. The calculated heat source and electromagnetic force, under the boundary conditions of the temperature field and flow field, are solved simultaneously using the energy conservation equation, mass conservation equation, and momentum conservation equation. The temperature field, velocity field, and pressure field can be obtained through these three conservation equations. In COMSOL simulation software, temperature field distribution maps, velocity field distribution maps, and pressure field distribution maps can also be obtained. The distribution maps can be in the form of contour maps, streamline maps, vector maps, etc.

[0041] Step S204: Select the target parameters of the frequency divider based on the temperature field, velocity field and pressure field. The target parameters include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance and the resistance value of the heating resistor.

[0042] Specifically, the longer the discharge gap distance, the more uneven the electric field distribution of the gap electrodes, and the higher the breakdown voltage becomes as the discharge gap increases. If the discharge gap distance becomes even longer, the air inside the gap becomes less likely to discharge. Based on the distribution of the temperature field, velocity field, and pressure field described below for different gap distances, a reasonable discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor should be selected.

[0043] In this embodiment, firstly, initial physical parameters are obtained, including at least initial temperature, air layer flow velocity, and initial pressure. Then, electric field and magnetic field calculations are performed on the initial physical parameters to obtain electromagnetic parameters. Based on these electromagnetic parameters, heat source terms and electromagnetic forces are calculated, including electric field strength, current density, and magnetic field strength. Subsequently, using the heat source terms and electromagnetic forces under temperature field boundary conditions and flow field boundary conditions, the energy conservation equation, mass conservation equation, and momentum conservation equation are solved simultaneously to obtain the temperature field, velocity field, and pressure field. The temperature field boundary condition is that the boundary heat source of the temperature field is Joule heating, and the flow field boundary condition allows fluid in the flow field to freely enter and exit. Finally, based on the temperature field, velocity field, and pressure field, target parameters for the frequency divider are selected, including the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor. This application simulates the actual operation of a frequency-division decoupler in simulation software by utilizing the coupling of electric, magnetic, flow, and temperature fields. The temperature, velocity, and pressure fields are obtained, and the resistance values ​​of the heating resistor, the frequency-division inductor, and the discharge gap distance are determined and verified based on these fields. This application solves the problem of poor decoupler performance caused by the lack of systematic parameter selection in existing technologies.

[0044] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the frequency divider parameter selection method of this application will be described in detail below with reference to specific embodiments.

[0045] In order to accurately simulate the electromagnetic performance of the frequency divider disconnector under actual operating conditions, in an optional embodiment, step S202 above includes:

[0046] Step S2021, the first calculation step, couples the electric field and magnetic field, simulates the electrostatic field in the frequency divider based on the initial physical parameters, and performs electric field calculation to obtain the current electric field strength and current current density.

[0047] Step S2022, first judgment step, judge whether the current electric field strength and the current current density have both reached the first convergence condition. The first convergence condition is that the first relative tolerance is less than the first set tolerance. The first relative tolerance is the relative tolerance after the current electric field calculation. The relative tolerance is used to measure the ratio of the difference between two iterations to the current value.

[0048] Step S2023: When the current electric field strength and the current current density reach the first convergence condition, the current electric field strength is determined as the electric field strength and the current current density is determined as the current density.

[0049] Step S2024, the second calculation step, couples the electric field and magnetic field, simulates the magnetic field of the frequency divider based on the initial physical parameters, and performs magnetic field calculation to obtain the current magnetic field strength;

[0050] Step S2025, second judgment step, determine whether the current magnetic field strength has reached the second convergence condition. The second convergence condition is that the second relative tolerance is less than the second set tolerance. The second relative tolerance is the relative tolerance after the current magnetic field calculation.

[0051] Step S2026: If the current magnetic field strength meets the second convergence condition, the current magnetic field strength is determined as the magnetic field strength.

[0052] In the above embodiments, such as Figure 3 As shown, the electric field calculation module and the magnetic field calculation module are built-in field calculation functions in the COMSOL simulation software. They utilize the coupling of electric field, magnetic field, flow field, and temperature field to simulate the actual operation of a frequency divider decoupling device. The electric field calculation module is mainly used for simulating electrostatic fields. Figure 3 The electromagnetic module includes two convergence conditions: a first convergence condition and a second convergence condition. The most commonly used convergence condition is relative convergence, typically defined as the relative change in the residuals during the solution process. A common relative convergence criterion is: relative tolerance < 10. -3 The convergence condition is either greater than or equal to a value smaller than the value (usually a convergence condition provided by the COMSOL simulation software system). Both the first and second convergence conditions can use the aforementioned convergence criteria. Electric field calculations are performed using the initial physical parameters. The calculated electric field typically includes electric field strength E and current density J. If the first convergence condition is met, the current electric field strength and current density obtained from the current iteration are determined as the electric field strength and current density, respectively. Magnetic field calculations are performed using the initial physical parameters. The calculated magnetic field strength is B. If the second convergence condition is met, the current magnetic field strength obtained from the current iteration is determined as the magnetic field strength. The coupled calculation of the electric and magnetic fields more accurately simulates the electromagnetic performance of the frequency divider decoupling under actual operating conditions.

[0053] To improve the accuracy of the electric field calculation results, in an optional embodiment, after step S2022 above, the method further includes:

[0054] Step S301: If the current electric field strength and / or the current current density do not meet the first convergence condition, repeat the first calculation step and the first judgment step until both the current electric field strength and the current current density meet the first convergence condition, and determine the current electric field strength as the electric field strength and the current current density as the current density.

[0055] In the above embodiments, because the electric field strength and current density need to be within specific ranges to ensure stable system operation and accurate simulation of arc generation, the first calculation step and the first judgment step are repeated until both the current electric field strength and the current current density reach the first convergence condition. Figure 3 As shown, the parameter n represents the number of iterations. By continuously adjusting until the first convergence condition is met, it can be ensured that the system operates within the specified parameters, avoiding overload or instability. Repeating the calculation until the condition is met can reduce error accumulation and improve the accuracy of the calculation results.

[0056] To improve the accuracy of the magnetic field calculation results, in an optional embodiment, after step S2025 above, the method further includes:

[0057] Step S401: If the current magnetic field strength does not meet the second convergence condition, repeat the second calculation step and the second judgment step until the current magnetic field strength meets the second convergence condition, and determine the current magnetic field strength as the magnetic field strength.

[0058] In the above embodiments, since the magnetic field strength needs to be within a specific range to ensure the stable operation of the system and the accuracy of the simulated electric arc generation, the accuracy of the calculation results can be ensured by continuously iterating the calculation until the magnetic field strength meets the second convergence condition. This makes the simulated magnetic field strength closer to the actual situation, improves the accuracy and stability of the magnetic field simulation, and makes the calculated magnetic field strength more accurate.

[0059] To provide a theoretical basis for selecting the parameters of the frequency divider disconnector, in an optional implementation, step S202 further includes:

[0060] Step S2027: Calculate all heat sources according to the first formula, and integrate all the above heat sources to obtain the heat source item. The first formula is: in, Q i The heat source is defined as the heat source per unit volume per unit time, σ represents the conductivity inside the electric arc, J represents the current density, μ represents the magnetic permeability, and A represents the magnetic vector potential.

[0061] Step S2028: Calculate the product between the current density and the magnetic field strength to obtain the electromagnetic force.

[0062] In the above embodiments, the internal heat source of the electric arc is determined by Joule heating. Where σ and J represent the conductivity and current density inside the arc, respectively, A is the magnetic vector potential, and μ is the permeability. Multiple heat sources are calculated according to the first formula above. COMSOL simulation software merges these heat sources to obtain the total heat energy distribution inside the arc, i.e., the heat source term Q. The total heat energy distribution is an important physical quantity describing the behavior of the arc because it determines the temperature field of the arc, thus affecting the conductivity and current density distribution. Electromagnetic force is the force exerted on the arc under the influence of electric and magnetic fields, and it affects the motion and shape of the arc. The arc moves under the combined action of internal and external magnetic fields, resulting in energy transfer and satisfying the law of conservation of momentum. Among them, F e F represents the electromagnetic force acting on an electric arc. e =J×B. Calculating the electromagnetic force helps in understanding how the electric arc moves and changes under the combined influence of electric and magnetic fields. The calculation of the heat source term and electromagnetic force provides the theoretical basis for the design of the frequency divider disconnector. Through these calculations, the resistance of the heating resistor, the frequency divider inductance, the discharge gap distance, and the spark gap distance can be determined; these are all key parameters affecting the performance of the frequency divider disconnector. Furthermore, the spark gap and discharge gap are structural elements within the frequency divider disconnector.

[0063] To more accurately simulate and analyze the behavior of an electric arc, in one optional implementation, step S203 includes:

[0064] Step S2031: When the fluid is incompressible, the energy conservation equation, mass conservation equation, and momentum conservation equation are solved simultaneously to obtain the temperature field, velocity field, and pressure field. The energy conservation equation is: Where ρ represents density, c p Let represent specific heat capacity, u represent velocity vector, T represent the temperature field, k represent thermal conductivity, Q represent the heat source term, and the mass conservation equation be: The above momentum conservation equation is: Where λ is viscosity, f represents the volume force of the fluid, and P represents the pressure field.

[0065] In the above embodiments, Figure 3 The conditional criteria include three convergence conditions. In COMSOL simulation software, the convergence conditions for mass conservation, momentum conservation, and energy conservation are crucial to ensuring that the numerical solution satisfies fundamental physical laws. The above energy conservation equation is obtained. The above mass conservation equation And the above momentum conservation equation The residuals are ensured to gradually decrease to an acceptable threshold. The energy conservation equation, mass conservation equation, and momentum conservation equation are solved simultaneously. After multiple iterations, the solution that satisfies the convergence condition is determined as the temperature field, velocity field, and pressure field, where i represents the iteration number. In power systems, the generation and extinction of electric arcs involve the interaction of electric, magnetic, flow, and temperature fields. By simultaneously solving the above equations, the behavior of electric arcs can be simulated and analyzed more accurately.

[0066] It should also be noted that, through the energy conservation equation, the mass conservation equation, and the momentum conservation equation, the temperature field, velocity field, and pressure field can be obtained. From this, new target parameters can be obtained. Repeat the above process until the simulation time is met. The COMSOL simulation software has a simulation duration and a simulation step size. If the simulation results (i.e., the results of the COMSOL simulation software simulating the electric arc) are unreasonable, the simulation time cannot be completed. However, based on the three distribution fields obtained, the parameters can be reselected until the simulation results converge to a reasonable value, which means the simulation time is completed, and then proceed to the next step.

[0067] In order to accurately select the target parameter, in one optional implementation, step S204 includes:

[0068] Step S2041: Select the discharge gap distance and the spark gap distance according to the temperature field, velocity field and pressure field and empirical data. The empirical data is a set of data obtained through multiple breakdown tests.

[0069] Step S2042: Substitute the above discharge gap distance or the above spark gap distance into the empirical formula to obtain the breakdown voltage, and calculate the resistance value of the above heating resistor based on the above breakdown voltage. The above empirical formula is U=a+bD, where U represents the above breakdown voltage and D represents the above discharge gap distance or the above spark gap distance.

[0070] Step S2043: Calculate the inductance value of the frequency divider inductor based on the resistance value of the heating resistor.

[0071] In the above embodiments, the longer the gap spacing, the more uneven the electric field distribution of the gap electrodes, and the higher the breakdown voltage becomes with the increase of the discharge gap. If the discharge gap spacing becomes longer, it becomes more difficult for the air inside the gap to discharge. A reasonable discharge gap distance and spark gap distance are selected based on the temperature and electric field distribution under different gap distances. The parameters of the heating resistor can be calculated using the empirical formula U = 30 + 1.1d, where a and b are proportional parameters, which can be set by those skilled in the art according to the circumstances. The power frequency breakdown voltage of the discharge gap or spark gap can be calculated using the formula... The resistance of the heating resistor can be calculated, where I is the power frequency fault current; the design of the frequency divider inductor is based on... This can represent the relationship between the voltage across the discharge gap or spark gap and the inductance, where R is the resistance of the heating resistor, L is the inductance, and i is the current through the frequency divider inductor. Alternatively, the obtained resistance of the heating resistor, inductance, discharge gap distance, and spark gap distance can be comprehensively considered and appropriately adjusted to select suitable parameter values.

[0072] To ensure the accuracy of the selected target parameters, in an optional implementation, after step S204 above, the method further includes:

[0073] Step S501: Simulate the first current response and the first voltage response in COMSOL simulation software according to the target parameters of the frequency divider disconnector.

[0074] Step S502: Construct a frequency divider disconnector simulation circuit, and use the Mayr arc equation combined with the above target parameters to simulate the gap structure, and obtain the second current response and the second voltage response. The gap structure includes the spark gap and the discharge gap.

[0075] Step S503: If the difference between the first current response and the second current response is greater than the first set difference and / or the difference between the first voltage response and the second voltage response is greater than the second set difference, it is determined that the target parameter selection is unreasonable, and the target parameter of the frequency divider disconnector is reselected.

[0076] Step S504: If the difference between the first current response and the second current response is less than or equal to the first set difference and / or the difference between the first voltage response and the second voltage response is less than or equal to the second set difference, it is determined that the selection of the target parameter is reasonable.

[0077] In the above embodiments, the novel disconnector in circuit simulation mainly includes a heating resistor, a frequency-dividing inductor, and a discharge gap. In EMTP-ATP, the dynamic changes of the discharge gap cannot be represented by a static model; therefore, MODELS is used to simulate the electric arc, such as... Figure 4 As shown, Figure 4 The circuit diagram provided in this embodiment of the invention is for verifying the parameters of the novel frequency divider disconnector. Under the action of the frequency divider inductor, the lightning current and the operating overcurrent will flow through the right discharge gap, while the power frequency current will flow through the left circuit. If the current is too large, it will discharge through the gap to protect the heating resistor. Figure 4 The system includes an AC voltage source, an inductor, two sliding rheostats, two resistors, and two MODELS models simulating electric arcs. Models XX0004 and XX0005 are both MODELS models simulating electric arcs. The voltage source is connected to the first element, model XX0004 is connected to the second element, and model XX0005 is connected to the third element. The first element is used to read the voltage at that node, the second element is used to read the arc conductance value from model XX0004, and the third element is used to read the arc conductance value from model XX0005. The specific coding diagram for simulating an electric arc using MODELS is shown below. Figure 5 As shown, the Mayr arc conductance equation is: In the formula, u is the arc voltage, g is the arc conductance, and i is the arc current, all of which are functions of time t. P(g) is the arc heat dissipation power, and τ(g) is the arc time constant. Solving the above first-order differential equation using the Euler method yields the following result. Because using this formula for calculation results in numerical instability, it needs to be modified. First, the function e... x Expand into a Taylor series Taking the first two terms of the expansion and transforming them, we get x = 1 - e -x , use x Replacement, available so This is used to replace the generation of an electric arc. By inputting different current levels at the power supply end, the voltage and current responses across the discharge gap can be obtained. The simulation results of the electric arc simulated by MODELS and COMSOL can be compared to verify whether the selected target parameters are reasonable. It can also verify the anti-time-dependent characteristics of the new frequency divider disconnector and that the more severe the damage to the surge arrester, the faster the disconnector operates.

[0078] 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.

[0079] This application also provides a parameter selection device for a frequency divider disconnector. It should be noted that this parameter selection device can be used to execute the parameter selection method for a frequency divider disconnector provided in this application. This device 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 device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0080] The following describes the selection device for the frequency divider disconnector parameters provided in the embodiments of this application.

[0081] Figure 6 This is a structural block diagram of a frequency divider parameter selection device according to an embodiment of this application. Figure 6 As shown, the device includes:

[0082] The acquisition unit 10 is used to acquire initial physical parameters, which include at least the initial temperature, air layer flow velocity, and initial pressure.

[0083] Specifically, the generation of an electric arc in reality is the result of the coupling of multiple fields: electric field, magnetic field, flow field, and temperature field. As a collection of charged particles, the initial temperature of the electric arc is one of the factors determining its conductivity. The conductivity and boundary conditions determine the distribution of current density, which in turn determines the strength of the magnetic field inside the arc. Electrothermal coupling generates Joule heating. The arc moves under the influence of internal and external magnetic fields, leading to energy transfer. This energy transfer, in turn, redistributes the temperature and pressure of the arc, generating new arcs. The Joule heating generated by the electric and magnetic fields determines the distribution of the internal heat source. The heat transfer equation is: Where k is the thermal conductivity, W / (m·℃); Q i The heat source per unit volume per unit time, W / m 3 ρ is the density of the object, kg / m³ 3 c represents the specific heat capacity, J / (kg·℃). Therefore, initial physical parameters can be obtained first to simulate the generation of an electric arc.

[0084] The calculation unit 20 is used to perform electric field calculation and magnetic field calculation on the above initial physical parameters to obtain electromagnetic parameters, and to calculate the heat source term and electromagnetic force based on the above electromagnetic parameters. The above electromagnetic parameters include electric field strength, current density and magnetic field strength.

[0085] Specifically, such as Figure 3As shown, the electric field strength and current density are calculated using the electric field calculation module under the initial physical parameters that satisfy the electromagnetic field boundary conditions. Simultaneously, the magnetic field strength is calculated using the magnetic field calculation module. After calculating the electric field strength, current density, and magnetic field strength, the heat source term and electromagnetic force are calculated based on these electromagnetic parameters. For the boundary conditions at the interface between two different media, a continuity boundary condition is required to ensure the continuity of the electric and magnetic fields at the interface. In the COMSOL simulation software, the Continuity option is selected when setting the electromagnetic field boundary conditions.

[0086] The solution unit 30 is used to solve the energy conservation equation, mass conservation equation and momentum conservation equation simultaneously using the above heat source term and the above electromagnetic force under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field. The above temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the above flow field boundary condition is that the fluid in the flow field is allowed to enter and exit freely.

[0087] Specifically, after calculating the above-mentioned heat source term and electromagnetic force, the flow field and temperature field are coupled with the electromagnetic field. The temperature field is also a calculation module in the COMSOL simulation software. In this invention, Joule heating is used as the heat source. The flow field is also a calculation module in the COMSOL simulation software to simulate the air domain under real conditions. The electromagnetic field couples with the temperature field, and the electric arc generates Joule heating under the influence of both electric and magnetic fields. The internal heat source of the arc depends on Joule heating. The electromagnetic field couples with the flow field, and the electric arc moves under the combined action of internal and external magnetic fields, resulting in energy transfer. The temperature field and flow field couple with the electromagnetic field, and the flow velocity can affect the magnetic field strength by changing the current density. Temperature can change a series of thermodynamic properties (e.g., specific heat capacity) and affect the electromagnetic field. The calculated heat source and electromagnetic force, under the boundary conditions of the temperature field and flow field, are solved simultaneously using the energy conservation equation, mass conservation equation, and momentum conservation equation. The temperature field, velocity field, and pressure field can be obtained through these three conservation equations. In COMSOL simulation software, temperature field distribution maps, velocity field distribution maps, and pressure field distribution maps can also be obtained. The distribution maps can be in the form of contour maps, streamline maps, vector maps, etc.

[0088] The selection unit 40 is used to select the target parameters of the frequency divider disconnector based on the temperature field, velocity field and pressure field mentioned above. The target parameters include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance and the resistance value of the heating resistor.

[0089] Specifically, the longer the discharge gap distance, the more uneven the electric field distribution of the gap electrodes, and the higher the breakdown voltage becomes as the discharge gap increases. If the discharge gap distance becomes even longer, the air inside the gap becomes less likely to discharge. Based on the distribution of the temperature field, velocity field, and pressure field described below for different gap distances, a reasonable discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor should be selected.

[0090] In this embodiment, the acquisition unit is used to acquire initial physical parameters, which include at least initial temperature, air layer flow velocity, and initial pressure; the calculation unit is used to perform electric field calculation and magnetic field calculation on the initial physical parameters to obtain electromagnetic parameters, and calculate heat source terms and electromagnetic forces based on the electromagnetic parameters, which include electric field strength, current density, and magnetic field strength; the solution unit is used to solve the energy conservation equation, mass conservation equation, and momentum conservation equation simultaneously using the heat source terms and the electromagnetic forces under temperature field boundary conditions and flow field boundary conditions to obtain temperature field, velocity field, and pressure field, where the temperature field boundary condition is that the boundary heat source of the specified temperature field is Joule heating, and the flow field boundary condition allows fluid in the flow field to freely enter and exit; the selection unit is used to select target parameters of the frequency divider separator based on the temperature field, velocity field, and pressure field, where the target parameters include at least the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor. This application simulates the actual operation of a frequency-division decoupler in simulation software by utilizing the coupling of electric, magnetic, flow, and temperature fields. The temperature, velocity, and pressure fields are obtained, and the resistance values ​​of the heating resistor, the frequency-division inductor, and the discharge gap distance are determined and verified based on these fields. This application solves the problem of poor decoupler performance caused by the lack of systematic parameter selection in existing technologies.

[0091] To accurately simulate the electromagnetic performance of the frequency divider disconnector under actual operating conditions, in one optional embodiment, the above-mentioned calculation unit includes:

[0092] The first calculation module is used to perform the first calculation step, which couples the electric field and magnetic field, simulates the electrostatic field in the frequency-division decoupler according to the initial physical parameters, and performs electric field calculation to obtain the current electric field strength and current current density.

[0093] The first judgment module is used to execute the first judgment step to determine whether the current electric field strength and the current current density have both reached the first convergence condition. The first convergence condition is that the first relative tolerance is less than the first set tolerance. The first relative tolerance is the relative tolerance after the current electric field calculation. The relative tolerance is used to measure the ratio of the difference between two iterations to the current value.

[0094] The first determining module determines the current electric field strength as the electric field strength and the current current density as the current current density when the current electric field strength and the current current density meet the first convergence condition.

[0095] The second calculation module is used to perform the second calculation step, which couples the electric field and magnetic field, simulates the magnetic field of the frequency divider based on the initial physical parameters, and performs magnetic field calculation to obtain the current magnetic field strength.

[0096] The second judgment module is used to execute the second judgment step to determine whether the current magnetic field strength has reached the second convergence condition. The second convergence condition is that the second relative tolerance is less than the second set tolerance. The second relative tolerance is the relative tolerance after the current magnetic field calculation.

[0097] The second determining module determines the current magnetic field strength as the magnetic field strength if the current magnetic field strength meets the second convergence condition.

[0098] In the above embodiments, such as Figure 3 As shown, the electric field calculation module and the magnetic field calculation module are built-in field calculation functions in the COMSOL simulation software. They utilize the coupling of electric field, magnetic field, flow field, and temperature field to simulate the actual operation of a frequency divider decoupling device. The electric field calculation module is mainly used for simulating electrostatic fields. Figure 3 The electromagnetic module includes two convergence conditions: a first convergence condition and a second convergence condition. The most commonly used convergence condition is relative convergence, typically defined as the relative change in the residuals during the solution process. A common relative convergence criterion is: relative tolerance < 10. -3 The convergence condition is either greater than or equal to a value smaller than the value (usually a convergence condition provided by the COMSOL simulation software system). Both the first and second convergence conditions can use the aforementioned convergence criteria. Electric field calculations are performed using the initial physical parameters. The calculated electric field typically includes electric field strength E and current density J. If the first convergence condition is met, the current electric field strength and current density obtained from the current iteration are determined as the electric field strength and current density, respectively. Magnetic field calculations are performed using the initial physical parameters. The calculated magnetic field strength is B. If the second convergence condition is met, the current magnetic field strength obtained from the current iteration is determined as the magnetic field strength. The coupled calculation of the electric and magnetic fields more accurately simulates the electromagnetic performance of the frequency divider decoupling under actual operating conditions.

[0099] To improve the accuracy of electric field calculation results, in one optional embodiment, the device further includes:

[0100] The first repeating unit is configured to, after determining whether the current electric field strength and the current current density have both reached the first convergence condition, and if the current electric field strength and / or the current current density have not reached the first convergence condition, repeatedly execute the first calculation step and the first determination step until the current electric field strength and the current current density have both reached the first convergence condition, thereby determining the current electric field strength as the electric field strength and the current current density as the current density.

[0101] In the above embodiments, because the electric field strength and current density need to be within specific ranges to ensure stable system operation and accurate simulation of arc generation, the first calculation step and the first judgment step are repeated until both the current electric field strength and the current current density reach the first convergence condition. Figure 3 As shown, the parameter n represents the number of iterations. By continuously adjusting until the first convergence condition is met, it can be ensured that the system operates within the specified parameters, avoiding overload or instability. Repeating the calculation until the condition is met can reduce error accumulation and improve the accuracy of the calculation results.

[0102] To improve the accuracy of magnetic field calculation results, in one optional embodiment, the device further includes:

[0103] The second repeating unit is used to, after determining whether the current magnetic field strength has reached the second convergence condition, and if the current magnetic field strength has not reached the second convergence condition, repeatedly execute the second calculation step and the second determination step until the current magnetic field strength reaches the second convergence condition, and determine the current magnetic field strength as the magnetic field strength.

[0104] In the above embodiments, since the magnetic field strength needs to be within a specific range to ensure the stable operation of the system and the accuracy of the simulated electric arc generation, the accuracy of the calculation results can be ensured by continuously iterating the calculation until the magnetic field strength meets the second convergence condition. This makes the simulated magnetic field strength closer to the actual situation, improves the accuracy and stability of the magnetic field simulation, and makes the calculated magnetic field strength more accurate.

[0105] To provide a theoretical basis for selecting the parameters of the frequency divider disconnector, in an optional implementation, the above-mentioned calculation unit further includes:

[0106] The fourth calculation module calculates all heat sources according to the first formula and integrates all the above heat sources to obtain the heat source item. The first formula is: in, Q iThe heat source is defined as the heat source per unit volume per unit time, σ represents the conductivity inside the electric arc, J represents the current density, μ represents the magnetic permeability, and A represents the magnetic vector potential.

[0107] The fifth calculation module calculates the product of the current density and the magnetic field strength to obtain the electromagnetic force.

[0108] In the above embodiments, the internal heat source of the electric arc is determined by Joule heating. Where σ and J represent the conductivity and current density inside the arc, respectively, A is the magnetic vector potential, and μ is the permeability. Multiple heat sources are calculated according to the first formula above. COMSOL simulation software merges these heat sources to obtain the total heat energy distribution inside the arc, i.e., the heat source term Q. The total heat energy distribution is an important physical quantity describing the behavior of the arc because it determines the temperature field of the arc, thus affecting the conductivity and current density distribution. Electromagnetic force is the force exerted on the arc under the influence of electric and magnetic fields, and it affects the motion and shape of the arc. The arc moves under the combined action of internal and external magnetic fields, resulting in energy transfer and satisfying the law of conservation of momentum. Among them, F e F represents the electromagnetic force acting on an electric arc. e =J×B. Calculating the electromagnetic force helps in understanding how the electric arc moves and changes under the combined influence of electric and magnetic fields. The calculation of the heat source term and electromagnetic force provides the theoretical basis for the design of the frequency divider disconnector. Through these calculations, the resistance of the heating resistor, the frequency divider inductance, the discharge gap distance, and the spark gap distance can be determined; these are all key parameters affecting the performance of the frequency divider disconnector. Furthermore, the spark gap and discharge gap are structural elements within the frequency divider disconnector.

[0109] To more accurately simulate and analyze the behavior of electric arcs, in one optional implementation, the solving unit includes:

[0110] Using the simultaneous solution module, assuming the fluid is incompressible, the energy conservation equation, mass conservation equation, and momentum conservation equation are solved simultaneously to obtain the temperature field, velocity field, and pressure field. The energy conservation equation is as follows: Where ρ represents density, c p Let represent specific heat capacity, u represent velocity vector, T represent the temperature field, k represent thermal conductivity, Q represent the heat source term, and the mass conservation equation be: The above momentum conservation equation is: Where λ is viscosity, f represents the volume force of the fluid, and P represents the pressure field.

[0111] In the above embodiments, Figure 3The conditional criteria include three convergence conditions. In COMSOL simulation software, the convergence conditions for mass conservation, momentum conservation, and energy conservation are crucial to ensuring that the numerical solution satisfies fundamental physical laws. The above energy conservation equation is obtained. The above mass conservation equation And the above momentum conservation equation The residuals are ensured to gradually decrease to an acceptable threshold. The energy conservation equation, mass conservation equation, and momentum conservation equation are solved simultaneously. After multiple iterations, the solution that satisfies the convergence condition is determined as the temperature field, velocity field, and pressure field, where i represents the iteration number. In power systems, the generation and extinction of electric arcs involve the interaction of electric, magnetic, flow, and temperature fields. By simultaneously solving the above equations, the behavior of electric arcs can be simulated and analyzed more accurately.

[0112] It should also be noted that, through the energy conservation equation, the mass conservation equation, and the momentum conservation equation, the temperature field, velocity field, and pressure field can be obtained. From this, new target parameters can be obtained. Repeat the above process until the simulation time is met. The COMSOL simulation software has a simulation duration and a simulation step size. If the simulation results (i.e., the results of the COMSOL simulation software simulating the electric arc) are unreasonable, the simulation time cannot be completed. However, based on the three distribution fields obtained, the parameters can be reselected until the simulation results converge to a reasonable value, which means the simulation time is completed, and then proceed to the next step.

[0113] In order to accurately select the target parameter, in one optional embodiment, the selection unit includes:

[0114] The module is selected based on the temperature field, velocity field, and pressure field described above, and the discharge gap distance and spark gap distance are selected according to empirical data. The empirical data is a set of data obtained through multiple breakdown tests.

[0115] The sixth calculation module calculates the breakdown voltage by substituting the above discharge gap distance or the above spark gap distance into the empirical formula, and calculates the resistance value of the above heating resistor based on the above breakdown voltage. The above empirical formula is U=a+bD, where U represents the above breakdown voltage and D represents the above discharge gap distance or the above spark gap distance.

[0116] The seventh calculation module calculates the inductance value of the frequency divider inductor based on the resistance value of the heating resistor.

[0117] In the above embodiments, the longer the gap spacing, the more uneven the electric field distribution of the gap electrodes, and the higher the breakdown voltage becomes with the increase of the discharge gap. If the discharge gap spacing becomes longer, it becomes more difficult for the air inside the gap to discharge. A reasonable discharge gap distance and spark gap distance are selected based on the temperature and electric field distribution under different gap distances. The parameters of the heating resistor can be calculated using the empirical formula U = 30 + 1.1d, where a and b are proportional parameters, which can be set by those skilled in the art according to the circumstances. The power frequency breakdown voltage of the discharge gap or spark gap can be calculated using the formula... The resistance of the heating resistor can be calculated, where I is the power frequency fault current; the design of the frequency divider inductor is based on... This can represent the relationship between the voltage across the discharge gap or spark gap and the inductance, where R is the resistance of the heating resistor, L is the inductance, and i is the current through the frequency divider inductor. Alternatively, the obtained resistance of the heating resistor, inductance, discharge gap distance, and spark gap distance can be comprehensively considered and appropriately adjusted to select suitable parameter values.

[0118] To ensure the accuracy of the selected target parameters, in one optional embodiment, the device further includes:

[0119] The simulation unit is used to simulate the first current response and the first voltage response in COMSOL simulation software after selecting the target parameters of the frequency divider based on the above temperature field, the above velocity field and the above pressure field.

[0120] The simulation unit is used to construct the frequency divider disconnector simulation circuit and to simulate the gap structure using the Mayr arc equation combined with the above target parameters to obtain the second current response and the second voltage response. The gap structure includes the spark gap and the discharge gap.

[0121] The first determination unit is used to determine that the selection of the target parameter is unreasonable and to reselect the target parameter of the frequency divider when the difference between the first current response and the second current response is greater than a first set difference and / or the difference between the first voltage response and the second voltage response is greater than a second set difference.

[0122] The second determination unit is used to determine that the selection of the target parameter is reasonable when the difference between the first current response and the second current response is less than or equal to the first set difference and / or the difference between the first voltage response and the second voltage response is less than or equal to the second set difference.

[0123] In the above embodiments, the novel disconnector in circuit simulation mainly includes a heating resistor, a frequency-dividing inductor, and a discharge gap. In EMTP-ATP, the dynamic changes of the discharge gap cannot be represented by a static model; therefore, MODELS is used to simulate the electric arc, such as... Figure 4 As shown, Figure 4 The circuit diagram provided in this embodiment of the invention is for verifying the parameters of the novel frequency divider disconnector. Under the action of the frequency divider inductor, the lightning current and the operating overcurrent will flow through the right discharge gap, while the power frequency current will flow through the left circuit. If the current is too large, it will discharge through the gap to protect the heating resistor. Figure 4 The system includes an AC voltage source, an inductor, two sliding rheostats, two resistors, and two MODELS models simulating electric arcs. Models XX0004 and XX0005 are both MODELS models simulating electric arcs. The voltage source is connected to the first element, model XX0004 is connected to the second element, and model XX0005 is connected to the third element. The first element is used to read the voltage at that node, the second element is used to read the arc conductance value from model XX0004, and the third element is used to read the arc conductance value from model XX0005. The specific coding diagram for simulating an electric arc using MODELS is shown below. Figure 5 As shown, the Mayr arc conductance equation is: In the formula, u is the arc voltage, g is the arc conductance, and i is the arc current, all of which are functions of time t. P(g) is the arc heat dissipation power, and τ(g) is the arc time constant. Solving the above first-order differential equation using the Euler method yields the following result. Because using this formula for calculation results in numerical instability, it needs to be modified. First, the function e... x Expand into a Taylor series Taking the first two terms of the expansion and transforming them, we get x = 1 - e -x , use x Replacement, available so This is used to replace the generation of an electric arc. By inputting different current levels at the power supply end, the voltage and current responses across the discharge gap can be obtained. The simulation results of the electric arc simulated by MODELS and COMSOL can be compared to verify whether the selected target parameters are reasonable. It can also verify the anti-time-dependent characteristics of the new frequency divider disconnector and that the more severe the damage to the surge arrester, the faster the disconnector operates.

[0124] The aforementioned frequency divider parameter selection device includes a processor and a memory. The acquisition unit, calculation unit, and solution unit are all stored as program units in the memory, and the processor executes these program units to achieve the corresponding functions. All of the above modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0125] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and adjusting kernel parameters can address the problem of poor performance caused by the lack of systematic parameter selection for frequency divider demultiplexers in existing technologies.

[0126] 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.

[0127] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the frequency divider parameter selection method.

[0128] Specifically, the methods for selecting the parameters of the frequency divider disconnector include:

[0129] Step S201: Obtain initial physical parameters, which include at least initial temperature, air layer flow velocity, and initial pressure.

[0130] Step S202: Perform electric field calculation and magnetic field calculation on the above initial physical parameters to obtain electromagnetic parameters, and calculate the heat source term and electromagnetic force based on the above electromagnetic parameters. The above electromagnetic parameters include electric field strength, current density and magnetic field strength.

[0131] Step S203: Using the above heat source term and the above electromagnetic force, solve the energy conservation equation, mass conservation equation and momentum conservation equation simultaneously under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field. The above temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the above flow field boundary condition is that the fluid in the flow field is allowed to enter and exit freely.

[0132] Step S204: Select the target parameters of the frequency divider based on the temperature field, velocity field and pressure field. The target parameters include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance and the resistance value of the heating resistor.

[0133] This invention provides a processor for running a program, wherein the program executes the selection method for the frequency divider parameters.

[0134] This invention provides a frequency divider disconnector, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0135] Step S201: Obtain initial physical parameters, which include at least initial temperature, air layer flow velocity, and initial pressure.

[0136] Step S202: Perform electric field calculation and magnetic field calculation on the above initial physical parameters to obtain electromagnetic parameters, and calculate the heat source term and electromagnetic force based on the above electromagnetic parameters. The above electromagnetic parameters include electric field strength, current density and magnetic field strength.

[0137] Step S203: Using the above heat source term and the above electromagnetic force, solve the energy conservation equation, mass conservation equation and momentum conservation equation simultaneously under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field. The above temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the above flow field boundary condition is that the fluid in the flow field is allowed to enter and exit freely.

[0138] Step S204: Select the target parameters of the frequency divider based on the temperature field, velocity field and pressure field. The target parameters include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance and the resistance value of the heating resistor.

[0139] 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:

[0140] Step S201: Obtain initial physical parameters, which include at least initial temperature, air layer flow velocity, and initial pressure.

[0141] Step S202: Perform electric field calculation and magnetic field calculation on the above initial physical parameters to obtain electromagnetic parameters, and calculate the heat source term and electromagnetic force based on the above electromagnetic parameters. The above electromagnetic parameters include electric field strength, current density and magnetic field strength.

[0142] Step S203: Using the above heat source term and the above electromagnetic force, solve the energy conservation equation, mass conservation equation and momentum conservation equation simultaneously under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field. The above temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the above flow field boundary condition is that the fluid in the flow field is allowed to enter and exit freely.

[0143] Step S204: Select the target parameters of the frequency divider based on the temperature field, velocity field and pressure field. The target parameters include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance and the resistance value of the heating resistor.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0154] 1) The method for selecting parameters of the frequency divider in this application involves first obtaining initial physical parameters, which include at least initial temperature, airflow velocity, and initial pressure; then, performing electric field and magnetic field calculations on the initial physical parameters to obtain electromagnetic parameters, and calculating the heat source term and electromagnetic force based on the electromagnetic parameters, which include electric field strength, current density, and magnetic field strength; subsequently, using the heat source term and electromagnetic force under temperature field boundary conditions and flow field boundary conditions, simultaneously solving the energy conservation equation, mass conservation equation, and momentum conservation equation to obtain the temperature field, velocity field, and pressure field, where the temperature field boundary condition is that the boundary heat source is Joule heating, and the flow field boundary condition allows free entry and exit of fluid in the flow field; finally, selecting the target parameters of the frequency divider based on the temperature field, velocity field, and pressure field, which include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor. This application simulates the actual operation of a frequency-division decoupler in simulation software by utilizing the coupling of electric, magnetic, flow, and temperature fields. The temperature, velocity, and pressure fields are obtained, and the resistance values ​​of the heating resistor, the frequency-division inductor, and the discharge gap distance are determined and verified based on these fields. This application solves the problem of poor decoupler performance caused by the lack of systematic parameter selection in existing technologies.

[0155] 2) The parameter selection device for the frequency divider decoy of this application includes an acquisition unit for acquiring initial physical parameters, which at least include initial temperature, air layer flow velocity, and initial pressure; a calculation unit for performing electric field calculation and magnetic field calculation on the initial physical parameters to obtain electromagnetic parameters, and calculating heat source terms and electromagnetic forces based on the electromagnetic parameters, which include electric field strength, current density, and magnetic field strength; a solution unit for simultaneously solving the energy conservation equation, mass conservation equation, and momentum conservation equation using the heat source terms and the electromagnetic forces under temperature field boundary conditions and flow field boundary conditions to obtain the temperature field, velocity field, and pressure field, where the temperature field boundary condition is that the boundary heat source of the specified temperature field is Joule heating, and the flow field boundary condition allows fluid in the flow field to freely enter and exit; and a selection unit for selecting target parameters of the frequency divider decoy based on the temperature field, velocity field, and pressure field, where the target parameters at least include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor. This application simulates the actual operation of a frequency-division decoupler in simulation software by utilizing the coupling of electric, magnetic, flow, and temperature fields. The temperature, velocity, and pressure fields are obtained, and the resistance values ​​of the heating resistor, the frequency-division inductor, and the discharge gap distance are determined and verified based on these fields. This application solves the problem of poor decoupler performance caused by the lack of systematic parameter selection in existing technologies.

[0156] 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 selecting parameters of a frequency divider disconnector, characterized in that, include: Obtain initial physical parameters, which include at least initial temperature, air layer flow velocity, and initial pressure; Electric field and magnetic field calculations are performed on the initial physical parameters to obtain electromagnetic parameters. Heat source term and electromagnetic force are then calculated based on the electromagnetic parameters, which include electric field strength, current density and magnetic field strength. By using the heat source term and the electromagnetic force under the boundary conditions of the temperature field and the flow field, the energy conservation equation, the mass conservation equation and the momentum conservation equation are solved simultaneously to obtain the temperature field, the velocity field and the pressure field. The boundary condition of the temperature field is that the boundary heat source of the temperature field is Joule heat, and the boundary condition of the flow field allows the fluid in the flow field to enter and exit freely. The target parameters of the frequency divider are selected based on the temperature field, the velocity field, and the pressure field. These target parameters include the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor. The initial physical parameters are used to perform electric field and magnetic field calculations to obtain electromagnetic parameters, including: a first calculation step, coupling the electric and magnetic fields to simulate the electrostatic field within the frequency divider based on the initial physical parameters and performing electric field calculations to obtain the current electric field strength and current current density; a first judgment step, judging whether the current electric field strength and current current density both reach a first convergence condition, the first convergence condition being that a first relative tolerance is less than a first set tolerance, the first relative tolerance being the relative tolerance after the current electric field calculation, the relative tolerance being used to measure the ratio of the difference between two iterations to the current value; the current electric field strength and current current density... If the current electric field strength is determined as the electric field strength and the current current density is determined as the current density when the first convergence condition is met; in the second calculation step, the electric field and magnetic field are coupled to simulate the magnetic field of the frequency divider decoupler according to the initial physical parameters and perform magnetic field calculation to obtain the current magnetic field strength; in the second judgment step, it is determined whether the current magnetic field strength has reached the second convergence condition, the second convergence condition being that the second relative tolerance is less than the second set tolerance, the second relative tolerance being the relative tolerance after the current magnetic field calculation; if the current magnetic field strength reaches the second convergence condition, the current magnetic field strength is determined as the magnetic field strength. The method further includes selecting target parameters for the frequency divider based on the temperature field, velocity field, and pressure field; selecting the discharge gap distance and spark gap distance based on empirical data obtained from multiple breakdown tests; obtaining the breakdown voltage by substituting the discharge gap distance or spark gap distance into an empirical formula, and calculating the resistance value of the heating resistor based on the breakdown voltage, wherein the empirical formula is U=a+bD, where U represents the breakdown voltage and D represents the discharge gap distance or spark gap distance; and calculating the inductance value of the frequency divider inductor based on the resistance value of the heating resistor.

2. The method according to claim 1, characterized in that, After determining whether both the current electric field strength and the current current density have reached the first convergence condition, the method further includes: If the current electric field strength and / or the current current density do not reach the first convergence condition, the first calculation step and the first judgment step are repeated until both the current electric field strength and the current current density reach the first convergence condition, and the current electric field strength is determined as the electric field strength, and the current current density is determined as the current density.

3. The method according to claim 1, characterized in that, After determining whether the current magnetic field strength meets the second convergence condition, the method further includes: If the current magnetic field strength does not reach the second convergence condition, the second calculation step and the second judgment step are repeated until the current magnetic field strength reaches the second convergence condition, and the current magnetic field strength is determined as the magnetic field strength.

4. The method according to claim 1, characterized in that, The calculation of the heat source term and electromagnetic force based on the electromagnetic parameters includes: All heat sources are calculated according to the first formula, and all heat sources are integrated to obtain a heat source term. The first formula is: ,in, , The heat source per unit volume per unit time. J represents the conductivity inside the electric arc, and J represents the current density. denoted by , where A represents the magnetic permeability; The electromagnetic force is obtained by calculating the product of the current density and the magnetic field strength.

5. The method according to claim 1, characterized in that, By simultaneously solving the energy conservation equation, mass conservation equation, and momentum conservation equation under the temperature field boundary conditions and the flow field boundary conditions using the heat source term and the electromagnetic force, the temperature field, velocity field, and pressure field are obtained, including: When the fluid is incompressible, the energy conservation equation, the mass conservation equation, and the momentum conservation equation are solved simultaneously to obtain the temperature field, the velocity field, and the pressure field. The energy conservation equation is: ,in, Indicates density, Indicates specific heat capacity. Let T represent the velocity vector, k represent the temperature field, k represent the thermal conductivity, and Q represent the heat source term. The mass conservation equation is: The momentum conservation equation is: ,in, It's viscosity. This represents the volume force of the fluid. This represents the pressure field.

6. The method according to claim 1, characterized in that, After selecting the target parameters of the frequency-division separator based on the temperature field, the velocity field, and the pressure field, the method further includes: The first current response and the first voltage response are obtained by simulating the target parameters of the frequency divider in COMSOL simulation software. A frequency divider disconnector simulation circuit was constructed, and the gap structure was simulated using the Mayr arc equation combined with the target parameters to obtain the second current response and the second voltage response. The gap structure includes a spark gap and a discharge gap. If the difference between the first current response and the second current response is greater than a first set difference and / or the difference between the first voltage response and the second voltage response is greater than a second set difference, it is determined that the target parameter selection is unreasonable, and the target parameter of the frequency divider disconnector is reselected. If the difference between the first current response and the second current response is less than or equal to the first set difference and / or the difference between the first voltage response and the second voltage response is less than or equal to the second set difference, the target parameter is determined to be reasonable.

7. A parameter selection device for a frequency divider disconnector, characterized in that, The device includes: An acquisition unit is used to acquire initial physical parameters, which include at least initial temperature, air layer flow velocity, and initial pressure. The calculation unit is used to perform electric field calculation and magnetic field calculation on the initial physical parameters to obtain electromagnetic parameters, and to calculate the heat source term and electromagnetic force based on the electromagnetic parameters. The electromagnetic parameters include electric field strength, current density and magnetic field strength. The solution unit is used to solve the energy conservation equation, mass conservation equation and momentum conservation equation simultaneously using the heat source term and the electromagnetic force under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field. The temperature field boundary condition is that the boundary heat source of the specified temperature field is Joule heat, and the flow field boundary condition allows the fluid in the flow field to enter and exit freely. The selection unit is used to select target parameters for the frequency divider disconnector based on the temperature field, the velocity field, and the pressure field. The target parameters include at least the discharge gap distance, the inductance value of the frequency divider inductor, the spark gap distance, and the resistance value of the heating resistor. The calculation unit includes: a first calculation module, used to execute a first calculation step, coupling the electric field and magnetic field to simulate the electrostatic field within the frequency divider decoupler according to the initial physical parameters and performing electric field calculation to obtain the current electric field strength and current current density; a first judgment module, used to execute a first judgment step, judging whether the current electric field strength and the current current density both reach a first convergence condition, the first convergence condition being that a first relative tolerance is less than a first set tolerance, the first relative tolerance being the relative tolerance after the current electric field calculation, the relative tolerance being used to measure the ratio of the difference between two iterations to the current value; and a first determination module, when the current electric field strength and the current current density reach the first convergence condition... In the following case, the current electric field strength is determined as the electric field strength, and the current current density is determined as the current density; the second calculation module is used to execute the second calculation step, which couples the electric field and magnetic field, simulates the magnetic field of the frequency divider decoupler according to the initial physical parameters, and performs magnetic field calculation to obtain the current magnetic field strength; the second judgment module is used to execute the second judgment step, which determines whether the current magnetic field strength reaches the second convergence condition, the second convergence condition being that the second relative tolerance is less than the second set tolerance, the second relative tolerance being the relative tolerance after the current magnetic field calculation; the second determination module, if the current magnetic field strength reaches the second convergence condition, determines the current magnetic field strength as the magnetic field strength. The selection unit includes: a selection module, which selects the discharge gap distance and the spark gap distance based on empirical data according to the temperature field, the velocity field, and the pressure field, wherein the empirical data is a set of data obtained through multiple breakdown tests; a sixth calculation module, which calculates the breakdown voltage by substituting the discharge gap distance or the spark gap distance into an empirical formula, and calculates the resistance value of the heating resistor based on the breakdown voltage, wherein the empirical formula is U=a+bD, where U represents the breakdown voltage and D represents the discharge gap distance or the spark gap distance; and a seventh calculation module, which calculates the inductance value of the frequency divider inductor based on the resistance value of the heating resistor.

8. 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 6.

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