Frequency division type disconnector parameter selection method and selection device

Abstract

The invention provides a method and a device for selecting parameters of a frequency division type disconnector. The method comprises the following steps: acquiring initial physical parameters; electric field calculation and magnetic field calculation are carried out on the initial physical parameters to obtain electromagnetic parameters, a heat source item and electromagnetic force are calculated according to the electromagnetic parameters, and the electromagnetic parameters comprise electric field intensity, current density and magnetic field intensity; solving an energy conservation equation, a mass conservation equation and a momentum conservation equation simultaneously under the temperature field boundary condition and the flow field boundary condition by using the heat source item and the electromagnetic force to obtain a temperature field, a velocity field and a pressure field; and selecting target parameters of the frequency division type disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters comprise a discharge gap distance, an inductance value of a frequency division inductor, a spark gap distance and a resistance value of a heating resistor. According to the invention, the problem of low performance of the disconnector caused by lack of system selection of parameters of the frequency division type disconnector in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of disconnectors, and in particular to a method for selecting parameters of a frequency-dividing disconnector, a selection device and a computer-readable storage medium. Background Art

[0002] While the disconnector is widely used in the power grid system, it has accumulated rich experience in use, promoted the enrichment and improvement of the types and functions of the disconnector, and pushed the preparation level of the disconnector to a new height. At present, the lightning arresters in operation in the power grid generally use corresponding matching disconnectors. According to the working mode, the disconnectors used in the existing metal oxide lightning arresters can be divided into two categories-thermal melt disconnectors and thermal explosion disconnectors. In actual operation, the thermal melt disconnector is prone to aging due to environmental factors such as humid air, resulting in malfunction or non-action of the disconnector. When the arrester current is very large, the disconnector needs to act quickly. However, the existing thermal melt disconnector cannot achieve this function due to the defects of its own structural principle, so the scope of application is limited. Thermal explosion arresters rely on parallel devices, and resistive disconnectors often use conductive rubber, but their disadvantages are obvious. For example, conductive rubber is not resistant to arc burning, and it is easy to form carbonized channels during long-term operation, losing resistance and generating heat, which will cause refusal to operate or malfunction. When the capacitor of a capacitive disconnector breaks down, the gap will no longer be broken down and discharged, and the thermal explosion tube cannot be caused to operate.

[0003] The new disconnector adopts the principle of double gaps and uses inductance frequency division. It can withstand lightning current and operating overcurrent, and can operate quickly and reliably under very small power frequency current. Based on the above analysis, it can be seen that the performance of the parallel element and the stability of the discharge gap (that is, there is no electrode ablation, breakdown voltage reduction, etc.) are the main factors that determine the performance of the disconnector. Therefore, the selection of heating resistors and the determination of gap distance in the new disconnector are particularly important. At present, there is a lack of systematic modeling and simulation analysis methods for parameter selection and principle verification in the study of new frequency division disconnectors. Summary of the invention

[0004] The main purpose of the present application is to provide a method, a device and a computer-readable storage medium for selecting parameters of a frequency-dividing disconnector, so as to at least solve the problem in the prior art that the performance of the disconnector is poor due to the lack of systematic selection of parameters of the frequency-dividing disconnector.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for selecting parameters of a frequency-dividing disconnector is provided, comprising: obtaining initial physical parameters, wherein the initial physical parameters include at least initial temperature, air layer flow velocity and initial pressure; performing electric field calculation and magnetic field calculation on the initial physical parameters respectively to obtain electromagnetic parameters, and calculating heat source terms and electromagnetic forces according to the electromagnetic parameters, wherein the electromagnetic parameters include electric field intensity, current density and magnetic field intensity; using the heat source terms and the electromagnetic forces to solve the energy conservation equation, the mass conservation equation and the momentum conservation equation under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, the velocity field and the pressure field, wherein the temperature field boundary conditions are that the boundary heat source of the temperature field is Joule heat, and the flow field boundary conditions are that the fluid in the flow field is allowed to freely enter and exit; selecting the target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor.

[0006] Optionally, the initial physical parameters are respectively subjected to electric field calculation and magnetic field calculation to obtain electromagnetic parameters, including: a first calculation step, coupling the electric field and the magnetic field, simulating the electrostatic field in the frequency-dividing disconnector according to the initial physical parameters and performing electric field calculation to obtain a current electric field strength and a current current density; a first judgment step, judging whether the current electric field strength and the current current density both meet 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 is performed, and the relative tolerance being used to measure the ratio of the difference between two iterations to the current value; and the current electric field strength and the current current density are determined by comparing the current electric field strength and the current current density. When 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 a second calculation step, the electric field and the magnetic field are coupled to simulate the magnetic field of the frequency-dividing disconnector according to the initial physical parameters and perform magnetic field calculation to obtain the current magnetic field strength; in a second judgment step, it is judged whether the current magnetic field strength reaches the second convergence condition, the second convergence condition is that the second relative tolerance is less than the second set tolerance, and the second relative tolerance is the relative tolerance after the current magnetic field calculation is performed; when 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 meet the first convergence condition, the method further includes: when the current electric field strength and / or the current current density do not meet the first convergence condition, repeating the first calculation step and the first judgment step until the current electric field strength and the current current density both meet 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 reaches the second convergence condition, the method further includes: if the current magnetic field strength does not reach the second convergence condition, repeatedly executing the second calculation step and the second judgment 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 the electromagnetic force according to the electromagnetic parameters includes: calculating all heat sources according to a first formula, and integrating all the heat sources to obtain a heat source term, wherein the first formula is in, Q i is the heat source in unit volume per unit time, σ represents the conductivity inside the 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 of the current density and the magnetic field strength.

[0010] Optionally, the heat source term and the electromagnetic force are used to solve the energy conservation equation, the mass conservation equation and the momentum conservation equation under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, the velocity field and the pressure field, including: when the fluid is an incompressible fluid, the energy conservation equation, the mass conservation equation and the momentum conservation equation are solved to obtain the temperature field, the velocity field and the pressure field, and the energy conservation equation is Where ρ represents density, c p represents specific heat capacity, u represents velocity vector, T represents the temperature field, k represents thermal conductivity, Q represents the heat source term, and the mass conservation equation is: The momentum conservation equation is Wherein, λ is the 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 according to empirical data based on the temperature field, the velocity field and the pressure field, and the empirical data is a data set 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, and 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 division inductor is calculated based on the resistance value of the heating resistor.

[0012] Optionally, after selecting the target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, the method further includes: simulating in COMSOL simulation software according to the target parameters of the frequency-dividing disconnector to obtain a first current response and a first voltage response; constructing a simulation circuit of the frequency-dividing disconnector, and using the Mayr arc equation in combination with the target parameters to simulate the gap structure to obtain a second current response and a second voltage response, wherein the gap structure includes a spark gap and a discharge gap; 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, determining that the target parameter selection is unreasonable, and reselecting the target parameters of the frequency-dividing disconnector; 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, determining that the target parameter selection is reasonable.

[0013] According to another aspect of the present application, a device for selecting parameters of a frequency-dividing disconnector is provided, the device comprising: an acquisition unit for acquiring initial physical parameters, the initial physical parameters comprising 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 respectively to obtain electromagnetic parameters, and calculating heat source terms and electromagnetic forces according to the electromagnetic parameters, the electromagnetic parameters comprising electric field intensity, current density and magnetic field intensity; a solution unit for using the heat source terms and the electromagnetic forces to solve the energy conservation equation, the mass conservation equation and the momentum conservation equation under temperature field boundary conditions and flow field boundary conditions to obtain temperature field, velocity field and pressure field, the temperature field boundary condition being that the boundary heat source of the specified temperature field is Joule heat, and the flow field boundary condition being that the fluid in the flow field is allowed to freely enter and exit; a selection unit for selecting target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, the target parameters comprising at least discharge gap distance, inductance value of the frequency-dividing inductor, spark gap distance and heating resistor resistance value.

[0014] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described.

[0015] Applying the technical solution of the present application, in the method for selecting the parameters of the frequency-dividing disconnector, first, the initial physical parameters are obtained, and the above-mentioned initial physical parameters at least include the initial temperature, the air layer flow velocity and the initial pressure; then, the electric field calculation and the magnetic field calculation are performed on the above-mentioned initial physical parameters respectively to obtain the electromagnetic parameters, and the heat source term and the electromagnetic force are calculated according to the above-mentioned electromagnetic parameters, and the above-mentioned electromagnetic parameters include the electric field intensity, the current density and the magnetic field intensity; then, the above-mentioned heat source term and the above-mentioned electromagnetic force are used to solve the energy conservation equation, the mass conservation equation and the momentum conservation equation under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, the velocity field and the pressure field, the above-mentioned temperature field boundary conditions are that the boundary heat source of the temperature field is Joule heat, and the above-mentioned flow field boundary conditions are that the fluid in the flow field is allowed to freely enter and exit; finally, the target parameters of the frequency-dividing disconnector are selected according to the above-mentioned temperature field, the above-mentioned velocity field and the above-mentioned pressure field, and the above-mentioned target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor. The present application uses the coupling of electric field, magnetic field, flow field and temperature field in simulation software to simulate the actual operation of the frequency-dividing disconnector in practice, obtains the temperature field, velocity field and pressure field, and determines the resistance value of the heating resistor, the resistance value of the frequency-dividing inductor and the gap distance of the discharge gap according to the temperature field, velocity field and pressure field and verifies them. The present application solves the problem of the poor performance of the disconnector caused by the lack of systematic selection of parameters of the frequency-dividing disconnector in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for executing a method for selecting parameters of a frequency-division disengaging device provided in an embodiment of the present application is shown;

[0017] Figure 2 A schematic flow chart of a method for selecting parameters of a frequency-dividing disconnector provided in accordance with an embodiment of the present application is shown;

[0018] Figure 3 A schematic flow chart of a method for selecting parameters of a specific frequency-dividing disconnector provided in accordance with an embodiment of the present application is shown;

[0019] Figure 4 A circuit diagram of a frequency-dividing disconnector provided according to an embodiment of the present application is shown;

[0020] Figure 5 A coding diagram of a simulated arc provided according to an embodiment of the present application is shown;

[0021] Figure 6 A structural block diagram of a device for selecting parameters of a frequency-division disengaging device provided according to an embodiment of the present application is shown.

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

[0023] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] For the convenience of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0028] Relative tolerance: A measure of the difference between the numerical solution and the true solution relative to the size of the true solution.

[0029] As introduced in the background technology, the existing technology currently lacks a systematic modeling, simulation and analysis method for parameter selection and principle verification of new frequency division type disconnectors. In order to solve the problem that the lack of systematic selection of parameters of the frequency division type disconnector leads to poor performance of the disconnector, the embodiments of the present application provide a method for selecting parameters of a frequency division type disconnector, a selection device and a computer-readable storage medium.

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal for executing a method for selecting parameters of a frequency-dividing disengager according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0032] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for selecting parameters of the frequency-dividing disengager in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] In this embodiment, a method for selecting parameters of a frequency-dividing disconnector running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0034] Figure 2 FIG. 1 is a flow chart of a method for selecting parameters of a frequency-dividing disconnector according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0035] Step S201, obtaining initial physical parameters, wherein the initial physical parameters at least include initial temperature, air layer flow velocity and initial pressure.

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

[0037] Step S202, performing electric field calculation and magnetic field calculation on the above initial physical parameters respectively to obtain electromagnetic parameters, and calculating heat source terms and electromagnetic forces based on the above electromagnetic parameters, wherein the above electromagnetic parameters include electric field intensity, current density and magnetic field intensity.

[0038] Specifically, Figure 3 As shown, the electric field calculation module is used to calculate the electric field strength and current density for the initial physical parameters under the electromagnetic field boundary conditions, and the magnetic field calculation module is used to calculate the magnetic field to obtain the magnetic field strength. The electric field strength, current density and magnetic field strength are then used to calculate the heat source term and electromagnetic force based on these electromagnetic parameters. For the boundary conditions at the junction of two different media, continuity boundary conditions are required to ensure the continuity of the electric field and magnetic field at the junction of the media. When setting in the COMSOL simulation software, select Continuity to set the electromagnetic field boundary conditions.

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

[0040] Specifically, after the above-mentioned heat source term and the above-mentioned electromagnetic force are calculated, the flow field and the temperature field are added to couple with the electromagnetic field. The temperature field is also a calculation module in the COMSOL simulation software. In the present invention, Joule heat is used as the heat source. The flow field is also a calculation module in the COMSOL simulation software in order to simulate the air domain in real conditions. The coupling of electromagnetic field to temperature field, the arc generates Joule heat under the electric and magnetic fields, and the internal heat source of the arc depends on the Joule heat; the coupling of electromagnetic field to flow field, the arc moves under the joint action of internal and external magnetic fields and energy transfer occurs in the arc; the coupling of temperature field and flow field to electromagnetic field, the flow field velocity can affect the magnetic field intensity by changing the current density; and temperature can change a series of thermodynamic properties (for example, specific heat capacity, etc.) to affect the electromagnetic field. The calculated heat source and electromagnetic force are jointly solved to solve the energy conservation equation, mass conservation equation and momentum conservation equation under the boundary conditions of temperature field and flow field. The temperature field, velocity field and pressure field can be obtained through the three conservation equations. In COMSOL simulation software, temperature field distribution map, velocity field distribution map and pressure field distribution map can also be obtained. The distribution map can be in the form of contour map, streamline map, vector map, etc.

[0041] Step S204, selecting target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the heating resistor resistance value.

[0042] Specifically, the longer the discharge gap distance is, the more uneven the electric field distribution of the gap electrode is, and the breakdown voltage will increase with the increase of the discharge gap. If the discharge gap distance becomes longer, it is less likely for the air in the gap to discharge. According to the distribution of the following temperature field, the above velocity field and the above pressure field at different gap distances, a reasonable discharge gap distance, the inductance value of the frequency division inductor, the spark gap distance and the heating resistor resistance are selected.

[0043] In this embodiment, first, initial physical parameters are obtained, and the above initial physical parameters at least include initial temperature, air layer flow velocity and initial pressure; then, electric field calculation and magnetic field calculation are performed on the above initial physical parameters respectively to obtain electromagnetic parameters, and heat source terms and electromagnetic forces are calculated based on the above electromagnetic parameters, and the above electromagnetic parameters include electric field intensity, current density and magnetic field intensity; then, the above heat source terms and the above electromagnetic forces are used to jointly solve the energy conservation equation, the mass conservation equation and the momentum conservation equation 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 freely enter and exit; finally, the target parameters of the frequency-dividing disconnector are selected based on the above temperature field, the above velocity field and the above pressure field, and the above target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor. The present application uses the coupling of electric field, magnetic field, flow field and temperature field in simulation software to simulate the actual operation of the frequency-dividing disconnector in practice, obtains the temperature field, velocity field and pressure field, and determines the resistance value of the heating resistor, the resistance value of the frequency-dividing inductor and the gap distance of the discharge gap according to the temperature field, velocity field and pressure field and verifies them. The present application solves the problem of the poor performance of the disconnector caused by the lack of systematic selection of parameters of the frequency-dividing disconnector in the prior art.

[0044] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the method for selecting parameters of the frequency-dividing disconnector of the present application will be described in detail below in conjunction with specific embodiments.

[0045] In order to accurately simulate the electromagnetic performance of the frequency-dividing disconnector under actual working conditions, in an optional implementation manner, the above step S202 includes:

[0046] Step S2021, a first calculation step, coupling the electric field and the magnetic field to simulate the electrostatic field in the frequency-dividing disconnector according to the initial physical parameters and performing electric field calculation to obtain the current electric field strength and the current current density;

[0047] Step S2022, a first judgment step, judging whether the current electric field strength and the current current density both meet 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 a 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;

[0048] Step S2023, when the current electric field strength and the current current density meet 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;

[0049] Step S2024, a second calculation step, coupling the electric field and the magnetic field to simulate the magnetic field of the frequency-dividing disconnector according to the initial physical parameters and performing magnetic field calculation to obtain the current magnetic field strength;

[0050] Step S2025, a second determination step, determining whether the current magnetic field strength reaches a 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 is performed;

[0051] Step S2026: When the current magnetic field strength reaches the second convergence condition, determine the current magnetic field strength as the magnetic field strength.

[0052] In the above embodiment, if Figure 3 As shown in the figure, the electric field calculation module and the magnetic field calculation module are built-in field calculations in the COMSOL simulation software. They use the coupling of electric field, magnetic field, flow field and temperature field to simulate the actual operation of the frequency-dividing decoupler in practice. The electric field calculation module is mainly used for the simulation of the electrostatic field. Figure 3 The electromagnetic module includes two convergence conditions, namely the first convergence condition and the second convergence condition. The convergence condition is commonly used relative convergence, which is usually defined as the relative change of the residual during the solution process. Common relative convergence criteria are: relative tolerance <10 -3 , or smaller (usually the convergence condition that comes with the COMSOL simulation software system), the first convergence condition and the second convergence condition can use the above convergence criteria. The electric field calculation is performed using the initial physical parameters, and the calculation results of the electric field usually include the electric field intensity E and the current density J. When the first convergence condition is met, the current electric field intensity and the current current density calculated by the current iteration are determined as the electric field intensity and the current density, respectively. The magnetic field calculation is performed using the initial physical parameters, and the calculation result of the magnetic field is the magnetic field intensity B. When the second convergence condition is met, the current magnetic field intensity calculated by the current iteration is determined as the magnetic field intensity. The coupled calculation of the electric field and the magnetic field more accurately simulates the electromagnetic performance of the frequency-dividing disconnector under actual working conditions.

[0053] In order to improve the accuracy of the electric field calculation result, in an optional implementation manner, after the above step S2022, the method further includes:

[0054] Step S301, when the current electric field strength and / or the current current density do not reach the first convergence condition, repeatedly execute the first calculation step and the first judgment step until the current electric field strength and the current current density both reach the first convergence condition, determine the current electric field strength as the electric field strength, and determine the current current density as the current density.

[0055] In the above embodiment, because the electric field strength and current density need to be within a specific range to ensure the stable operation of the system and the accuracy of the simulated arc generation, the above first calculation step and the above first judgment step should be repeatedly performed until the above current electric field strength and the above current current density both reach the above first convergence condition, such as Figure 3 As shown, the parameter n represents the number of iterations. By continuously adjusting until the first convergence condition is reached, it is possible to ensure that the system works within the specified parameters and avoid overload or unstable state. Repeating the calculation until the conditions are met can reduce error accumulation and improve the accuracy of the calculation results.

[0056] In order to improve the accuracy of the magnetic field calculation result, in an optional implementation manner, after the above step S2025, the method further includes:

[0057] Step S401, when the current magnetic field strength does not reach the second convergence condition, repeatedly execute the second calculation step and the second judgment step until the current magnetic field strength reaches the second convergence condition, and determine the current magnetic field strength as the magnetic field strength.

[0058] In the above embodiment, because 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 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, so that the simulated magnetic field strength is closer to the actual situation, the accuracy and stability of the magnetic field simulation can be improved, and the calculated magnetic field strength is more accurate.

[0059] In order to provide a theoretical basis for parameter selection of the frequency-dividing disconnector, in an optional implementation manner, the above 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 term. The above first formula is in, Q i is the above heat source in unit volume per unit time, σ represents the conductivity inside the arc, J represents the above current density, μ represents the magnetic permeability, and A represents the magnetic vector potential;

[0061] Step S2028, calculating the product of the current density and the magnetic field strength to obtain the electromagnetic force.

[0062] In the above embodiment, the heat source inside the arc is determined by Joule heat. Among them, σ and J represent the internal conductivity and current density of the arc respectively, A is the magnetic vector potential, and μ is the magnetic permeability. According to the above first formula, multiple heat sources are calculated. The COMSOL simulation software fuses multiple heat sources to obtain the total heat energy distribution inside the arc, that is, the heat source term Q. The total heat energy distribution is an important physical quantity to describe the behavior of the arc, because the total heat energy distribution determines the temperature field of the arc, which in turn affects the conductivity and current density distribution of the arc. The electromagnetic force is the force exerted on the arc under the action of the electric field and the magnetic field. The electromagnetic force affects the movement and shape of the arc. The arc moves under the joint action of the internal and external magnetic fields and the energy transfer of the arc occurs, which satisfies the law of conservation of momentum. Among them, F e Indicates the electromagnetic force on the arc, F e =J×B, calculating the electromagnetic force can help understand how the arc moves and changes under the combined action of the electric field and the magnetic field. The calculation of the heat source term and the electromagnetic force provides a theoretical basis for the design of the frequency-dividing disconnector. Through these calculations, the resistance of the heating resistor, the frequency-dividing inductance value, the discharge gap distance and the spark gap distance can be determined, which are the key parameters affecting the performance of the frequency-dividing disconnector. In addition, the spark gap and the discharge gap are the structures in the frequency-dividing disconnector.

[0063] In order to more accurately simulate and analyze the behavior of the arc, in an optional implementation manner, the above step S203 includes:

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

[0065] In the above embodiment, Figure 3 The conditional judgment in includes three convergence conditions. When simulating in COMSOL simulation software, the convergence conditions of mass conservation, momentum conservation and energy conservation are the key to ensuring that the numerical solution satisfies the basic laws of physics. The above energy conservation equation is obtained The above mass conservation equation And the above momentum conservation equation The residuals are ensured to be gradually reduced to an acceptable threshold. The above energy conservation equation, the above mass conservation equation and the above momentum conservation equation are solved jointly. After multiple iterations, the solution results that meet the convergence conditions are determined as the above temperature field, the above velocity field and the above pressure field, where i represents the number of iterations. In the power system, the generation and extinction of arcs involve the interaction of electric fields, magnetic fields, flow fields and temperature fields. By solving the above equations jointly, the behavior of arcs can be simulated and analyzed more accurately.

[0066] It should also be noted that the temperature field, velocity field and pressure field can be derived through the above-mentioned energy conservation equation, the above-mentioned mass conservation equation and the above-mentioned momentum conservation equation, thereby obtaining new target parameters and repeating the above process until the simulation time is met; COMSOL simulation software has simulation time and simulation step. If the simulation result (that is, the result of the COMSOL simulation software simulating the arc) is unreasonable, the time cannot be completed, and the parameters can be reselected according to the three distribution fields obtained until the simulation result converges reasonably, that is, the time is completed, and then proceed to the next step.

[0067] In order to accurately select the target parameters, in an optional implementation manner, the above step S204 includes:

[0068] Step S2041, selecting the discharge gap distance and the spark gap distance according to the temperature field, the velocity field and the pressure field according to empirical data, wherein the empirical data is a data set obtained through multiple breakdown tests;

[0069] Step S2042, according to the above discharge gap distance or the above spark gap distance, the breakdown voltage is obtained by substituting the empirical formula, and the resistance value of the heating resistor is calculated according to the above breakdown voltage, the above empirical formula is U=a+bD, U represents the above breakdown voltage, and D represents the above discharge gap distance or the above spark gap distance;

[0070] Step S2043, calculating the inductance value of the frequency division inductor according to the resistance value of the heating resistor.

[0071] In the above embodiment, the longer the gap distance is, the more uneven the electric field distribution of the gap electrode is, and the breakdown voltage will increase with the increase of the discharge gap. If the discharge gap distance becomes longer, it is less likely for the air in the gap to discharge. According to the distribution of temperature and field strength at different gap distances, a reasonable discharge gap distance and spark gap distance are selected; the parameters of the heating resistor can be calculated according to the empirical formula U=30+1.1d, where a and b are proportional parameters, which can be set according to the situation by technicians in this field. The power frequency breakdown voltage of the discharge gap or spark gap can be calculated using the formula The thermal resistor value can be calculated, where I is the power frequency fault current; the design of the frequency division inductor is based on It can express the relationship between the voltage across the discharge gap or spark gap and the change of inductance, where R is the resistance of the heating resistor, L is the inductance, and i is the current passing through the frequency-divided inductor. It is also possible to comprehensively consider the obtained heating resistor resistance, inductance, discharge gap distance and spark gap distance, and make appropriate adjustments to select appropriate parameter values.

[0072] In order to ensure that the selected target parameters are accurate, in an optional implementation manner, after the above step S204, the method further includes:

[0073] Step S501, simulating in COMSOL simulation software according to the target parameters of the frequency division type disconnector to obtain a first current response and a first voltage response;

[0074] Step S502, constructing a frequency-dividing disconnector simulation circuit, and using the Mayr arc equation in combination with the above target parameters to simulate the gap structure to obtain a second current response and a second voltage response, wherein the gap structure includes a spark gap and a discharge gap;

[0075] Step S503, when 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 division disconnector is reselected;

[0076] Step S504: 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, it is determined that the target parameter selection is reasonable.

[0077] In the above embodiment, the circuit simulation of the new disconnector mainly includes a heating resistor, a frequency division inductor and a discharge gap. In EMTP-ATP, it is impossible to use a static model to represent the dynamic change of the discharge gap. With the help of MODELS, the arc is simulated. Figure 4 As shown, Figure 4 This is a circuit diagram for verifying the parameters of a new type of frequency-dividing disconnector provided according to an embodiment of the present invention. Under the action of the frequency-dividing inductance, the lightning current and the operating overcurrent will flow through the discharge gap on the right, while the power frequency current will flow through the circuit on the left. If the current is too large, it will discharge through the gap to protect the heating resistor. Figure 4 It includes an AC voltage source, an inductor, two sliding rheostats, two resistors and two MODELS models simulating arcs. Both XX0004 and XX0005 are MODELS models simulating arcs. The voltage source is connected to the first element, the MODELS model numbered XX0004 is connected to the second element, and the MODELS model numbered XX0005 is connected to the third element. The first element is used to read the voltage of the node, the second element is used to read the arc conductance value of the MODELS model numbered XX0004, and the third element is used to read the arc conductance value of the MODELS model numbered XX0005. The coding diagram for using MODELS to simulate arcs is shown in the figure below. Figure 5 As shown, Mayr arc conductance equation: In the formula, u is the arc voltage, g is the arc conductivity, 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. Using the Euler method to solve the above first-order differential equation, we get Since this formula is numerically unstable, it is transformed. First, the function e x Expanded into a Taylor series Take the first two terms of the expansion and transform them to get x = 1-e -x , use x Replacement, yes so This replaces the generation of arcs. By inputting different current levels at the power supply end, the voltage and current responses at both ends of the discharge gap can be obtained to see whether the simulation results of the MODELS arc simulation are consistent with the simulation results of COMSOL. This comparison can be used to verify whether the target parameters are reasonable, and the anti-aging characteristics of the new frequency-dividing disconnector can be verified, and the more serious the damage to the lightning arrester, the faster the disconnector will act.

[0078] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0079] The present application embodiment also provides a kind of frequency-dividing type disengaging device parameter selection device, it should be noted that the frequency-dividing type disengaging device parameter selection device of the present application embodiment can be used for executing the selection method for the frequency-dividing type disengaging device parameter provided by the present application embodiment. The device is used to realize the above-mentioned embodiment and preferred implementation mode, and the description has been made no more. As used below, the term "module" can realize the combination of software and / or hardware of predetermined function. Although the device described in the following embodiments is preferably realized with software, the realization of hardware, or the combination of software and hardware is also possible and conceived.

[0080] The following is an introduction to the device for selecting parameters of the frequency-dividing disconnector provided in the embodiment of the present application.

[0081] Figure 6 1 is a structural block diagram of a device for selecting parameters of a frequency-dividing decoupler according to an embodiment of the present application. Figure 6 As shown, the device comprises:

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

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

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

[0085] Specifically, Figure 3As shown, the electric field calculation module is used to calculate the electric field strength and current density for the initial physical parameters under the electromagnetic field boundary conditions, and the magnetic field calculation module is used to calculate the magnetic field to obtain the magnetic field strength. The electric field strength, current density and magnetic field strength are then used to calculate the heat source term and electromagnetic force based on these electromagnetic parameters. For the boundary conditions at the junction of two different media, continuity boundary conditions are required to ensure the continuity of the electric field and magnetic field at the junction of the media. When setting in the COMSOL simulation software, select Continuity to set the electromagnetic field boundary conditions.

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

[0087] Specifically, after the above-mentioned heat source term and the above-mentioned electromagnetic force are calculated, the flow field and the temperature field are added to couple with the electromagnetic field. The temperature field is also a calculation module in the COMSOL simulation software. In the present invention, Joule heat is used as the heat source. The flow field is also a calculation module in the COMSOL simulation software in order to simulate the air domain in real conditions. The coupling of electromagnetic field to temperature field, the arc generates Joule heat under the electric and magnetic fields, and the internal heat source of the arc depends on the Joule heat; the coupling of electromagnetic field to flow field, the arc moves under the joint action of internal and external magnetic fields and energy transfer occurs in the arc; the coupling of temperature field and flow field to electromagnetic field, the flow field velocity can affect the magnetic field intensity by changing the current density; and temperature can change a series of thermodynamic properties (for example, specific heat capacity, etc.) to affect the electromagnetic field. The calculated heat source and electromagnetic force are jointly solved to solve the energy conservation equation, mass conservation equation and momentum conservation equation under the boundary conditions of temperature field and flow field. The temperature field, velocity field and pressure field can be obtained through the three conservation equations. In COMSOL simulation software, temperature field distribution map, velocity field distribution map and pressure field distribution map can also be obtained. The distribution map can be in the form of contour map, streamline map, vector map, etc.

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

[0089] Specifically, the longer the discharge gap distance is, the more uneven the electric field distribution of the gap electrode is, and the breakdown voltage will increase with the increase of the discharge gap. If the discharge gap distance becomes longer, it is less likely for the air in the gap to discharge. According to the distribution of the following temperature field, the above velocity field and the above pressure field at different gap distances, a reasonable discharge gap distance, the inductance value of the frequency division inductor, the spark gap distance and the heating resistor resistance are selected.

[0090] In this embodiment, an acquisition unit is used to acquire initial physical parameters, and the above-mentioned initial physical parameters include at least initial temperature, air layer flow velocity and initial pressure; a calculation unit is used to perform electric field calculation and magnetic field calculation on the above-mentioned initial physical parameters respectively to obtain electromagnetic parameters, and calculate heat source terms and electromagnetic forces based on the above-mentioned electromagnetic parameters, and the above-mentioned electromagnetic parameters include electric field intensity, current density and magnetic field intensity; a solution unit is used to use the above-mentioned heat source terms and the above-mentioned electromagnetic forces to jointly solve the energy conservation equation, the mass conservation equation and the momentum conservation equation under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, the velocity field and the pressure field, the above-mentioned temperature field boundary conditions are that the boundary heat source of the specified temperature field is Joule heat, and the above-mentioned flow field boundary conditions are that the fluid in the flow field is allowed to freely enter and exit; a selection unit is used to select the target parameters of the frequency-dividing disconnector according to the above-mentioned temperature field, the above-mentioned velocity field and the above-mentioned pressure field, and the above-mentioned target parameters include at least the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor. The present application uses the coupling of electric field, magnetic field, flow field and temperature field in simulation software to simulate the actual operation of the frequency-dividing disconnector in practice, obtains the temperature field, velocity field and pressure field, and determines the resistance value of the heating resistor, the resistance value of the frequency-dividing inductor and the gap distance of the discharge gap according to the temperature field, velocity field and pressure field and verifies them. The present application solves the problem of the poor performance of the disconnector caused by the lack of systematic selection of parameters of the frequency-dividing disconnector in the prior art.

[0091] In order to accurately simulate the electromagnetic performance of the frequency-dividing disconnector under actual working conditions, in an optional implementation, the calculation unit includes:

[0092] A first calculation module is used to perform a first calculation step, couple the electric field and the magnetic field, simulate the electrostatic field in the above-mentioned frequency-dividing disconnector according to the above-mentioned initial physical parameters, and perform electric field calculation to obtain the current electric field strength and the current current density;

[0093] A first judgment module, used to execute a first judgment step, to judge whether the current electric field strength and the current current density both meet 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 a 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;

[0094] a first determining module, which determines the current electric field strength as the electric field strength and the current current density as the current density when the current electric field strength and the current current density meet the first convergence condition;

[0095] A second calculation module is used to perform a second calculation step, coupling the electric field and the magnetic field to simulate the magnetic field of the frequency-dividing disconnector according to the initial physical parameters and perform magnetic field calculation to obtain the current magnetic field strength;

[0096] A second judgment module is used to execute a second judgment step to judge whether the current magnetic field strength reaches a second convergence condition, the second convergence condition is that the second relative tolerance is less than the second set tolerance, and the second relative tolerance is the relative tolerance after the current magnetic field calculation is performed;

[0097] The second determination module determines the current magnetic field strength as the magnetic field strength when the current magnetic field strength reaches the second convergence condition.

[0098] In the above embodiment, if Figure 3 As shown in the figure, the electric field calculation module and the magnetic field calculation module are built-in field calculations in the COMSOL simulation software. They use the coupling of electric field, magnetic field, flow field and temperature field to simulate the actual operation of the frequency-dividing decoupler in practice. The electric field calculation module is mainly used for the simulation of the electrostatic field. Figure 3 The electromagnetic module includes two convergence conditions, namely the first convergence condition and the second convergence condition. The convergence condition is commonly used relative convergence, which is usually defined as the relative change of the residual during the solution process. Common relative convergence criteria are: relative tolerance <10 -3 , or smaller (usually the convergence condition that comes with the COMSOL simulation software system), the first convergence condition and the second convergence condition can use the above convergence criteria. The electric field calculation is performed using the initial physical parameters, and the calculation results of the electric field usually include the electric field intensity E and the current density J. When the first convergence condition is met, the current electric field intensity and the current current density calculated by the current iteration are determined as the electric field intensity and the current density, respectively. The magnetic field calculation is performed using the initial physical parameters, and the calculation result of the magnetic field is the magnetic field intensity B. When the second convergence condition is met, the current magnetic field intensity calculated by the current iteration is determined as the magnetic field intensity. The coupled calculation of the electric field and the magnetic field more accurately simulates the electromagnetic performance of the frequency-dividing disconnector under actual working conditions.

[0099] In order to improve the accuracy of the electric field calculation results, in an optional implementation manner, the device further includes:

[0100] A first repeating unit is used to, after judging whether the current electric field strength and the current current density have both reached the first convergence condition, 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 judgment step until the current electric field strength and the current current density have both reached the first convergence condition, determine the current electric field strength as the electric field strength, and determine the current current density as the current density.

[0101] In the above embodiment, because the electric field strength and current density need to be within a specific range to ensure the stable operation of the system and the accuracy of the simulated arc generation, the above first calculation step and the above first judgment step should be repeatedly performed until the above current electric field strength and the above current current density both reach the above first convergence condition, such as Figure 3 As shown, the parameter n represents the number of iterations. By continuously adjusting until the first convergence condition is reached, it is possible to ensure that the system works within the specified parameters and avoid overload or unstable state. Repeating the calculation until the conditions are met can reduce error accumulation and improve the accuracy of the calculation results.

[0102] In order to improve the accuracy of the magnetic field calculation results, in an optional implementation manner, the device further includes:

[0103] The second repeating unit is used to, after judging whether the current magnetic field strength reaches the second convergence condition, if the current magnetic field strength does not reach the second convergence condition, repeatedly execute the second calculation step and the second judgment 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 embodiment, because 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 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, so that the simulated magnetic field strength is closer to the actual situation, the accuracy and stability of the magnetic field simulation can be improved, and the calculated magnetic field strength is more accurate.

[0105] In order to provide a theoretical basis for parameter selection of the frequency-dividing disconnector, in an optional implementation manner, the 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 term. The above first formula is in, Q iis the above heat source in unit volume per unit time, σ represents the conductivity inside the arc, J represents the above 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 embodiment, the heat source inside the arc is determined by Joule heat. Among them, σ and J represent the internal conductivity and current density of the arc respectively, A is the magnetic vector potential, and μ is the magnetic permeability. According to the above first formula, multiple heat sources are calculated. The COMSOL simulation software fuses multiple heat sources to obtain the total heat energy distribution inside the arc, that is, the heat source term Q. The total heat energy distribution is an important physical quantity to describe the behavior of the arc, because the total heat energy distribution determines the temperature field of the arc, which in turn affects the conductivity and current density distribution of the arc. The electromagnetic force is the force exerted on the arc under the action of the electric field and the magnetic field. The electromagnetic force affects the movement and shape of the arc. The arc moves under the joint action of the internal and external magnetic fields and the energy transfer of the arc occurs, which satisfies the law of conservation of momentum. Among them, F e Indicates the electromagnetic force on the arc, F e =J×B, calculating the electromagnetic force can help understand how the arc moves and changes under the combined action of the electric field and the magnetic field. The calculation of the heat source term and the electromagnetic force provides a theoretical basis for the design of the frequency-dividing disconnector. Through these calculations, the resistance of the heating resistor, the frequency-dividing inductance value, the discharge gap distance and the spark gap distance can be determined, which are the key parameters affecting the performance of the frequency-dividing disconnector. In addition, the spark gap and the discharge gap are the structures in the frequency-dividing disconnector.

[0109] In order to more accurately simulate and analyze the behavior of the arc, in an optional implementation, the above-mentioned solving unit includes:

[0110] The simultaneous solution module, when the fluid is an incompressible fluid, solves 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 represents specific heat capacity, u represents velocity vector, T represents the above temperature field, k represents thermal conductivity, Q represents the above heat source term, and the above mass conservation equation is The above momentum conservation equation is Among them, λ is the viscosity, f represents the volume force of the above fluid, and P represents the above pressure field.

[0111] In the above embodiment, Figure 3The conditional judgment in includes three convergence conditions. When simulating in COMSOL simulation software, the convergence conditions of mass conservation, momentum conservation and energy conservation are the key to ensuring that the numerical solution satisfies the basic laws of physics. The above energy conservation equation is obtained The above mass conservation equation And the above momentum conservation equation The residuals are ensured to be gradually reduced to an acceptable threshold. The above energy conservation equation, the above mass conservation equation and the above momentum conservation equation are solved jointly. After multiple iterations, the solution results that meet the convergence conditions are determined as the above temperature field, the above velocity field and the above pressure field, where i represents the number of iterations. In the power system, the generation and extinction of arcs involve the interaction of electric fields, magnetic fields, flow fields and temperature fields. By solving the above equations jointly, the behavior of arcs can be simulated and analyzed more accurately.

[0112] It should also be noted that the temperature field, velocity field and pressure field can be derived through the above-mentioned energy conservation equation, the above-mentioned mass conservation equation and the above-mentioned momentum conservation equation, thereby obtaining new target parameters and repeating the above process until the simulation time is met; COMSOL simulation software has simulation time and simulation step. If the simulation result (that is, the result of the COMSOL simulation software simulating the arc) is unreasonable, the time cannot be completed, and the parameters can be reselected according to the three distribution fields obtained until the simulation result converges reasonably, that is, the time is completed, and then proceed to the next step.

[0113] In order to accurately select the target parameter, in an optional implementation manner, the selection unit includes:

[0114] A selection module, which selects the discharge gap distance and the spark gap distance according to the temperature field, the velocity field and the pressure field according to empirical data, wherein the empirical data is a data set obtained through multiple breakdown tests;

[0115] A sixth calculation module, which obtains a breakdown voltage by substituting the above-mentioned discharge gap distance or the above-mentioned spark gap distance into an empirical formula, and obtains the above-mentioned heating resistor resistance value by calculating the above-mentioned breakdown voltage, wherein the above-mentioned empirical formula is U=a+bD, where U represents the above-mentioned breakdown voltage, and D represents the above-mentioned discharge gap distance or the above-mentioned spark gap distance;

[0116] The seventh calculation module calculates the inductance value of the frequency division inductor according to the resistance value of the heating resistor.

[0117] In the above embodiment, the longer the gap distance is, the more uneven the electric field distribution of the gap electrode is, and the breakdown voltage will increase with the increase of the discharge gap. If the discharge gap distance becomes longer, it is less likely for the air in the gap to discharge. According to the distribution of temperature and field strength at different gap distances, a reasonable discharge gap distance and spark gap distance are selected; the parameters of the heating resistor can be calculated according to the empirical formula U=30+1.1d, where a and b are proportional parameters, which can be set according to the situation by technicians in this field. The power frequency breakdown voltage of the discharge gap or spark gap can be calculated using the formula The thermal resistor value can be calculated, where I is the power frequency fault current; the design of the frequency division inductor is based on It can express the relationship between the voltage across the discharge gap or spark gap and the change of inductance, where R is the resistance of the heating resistor, L is the inductance, and i is the current passing through the frequency-divided inductor. It is also possible to comprehensively consider the obtained heating resistor resistance, inductance, discharge gap distance and spark gap distance, and make appropriate adjustments to select appropriate parameter values.

[0118] In order to ensure that the selected target parameters are accurate, in an optional implementation manner, the device further includes:

[0119] A simulation unit, configured to select target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field, and the pressure field, and then simulate in COMSOL simulation software according to the target parameters of the frequency-dividing disconnector to obtain a first current response and a first voltage response;

[0120] A simulation unit is used to construct a frequency-dividing disconnector simulation circuit, and use the Mayr arc equation combined with the above target parameters to simulate the gap structure to obtain a second current response and a second voltage response, wherein the gap structure includes a spark gap and a discharge gap;

[0121] A first determination unit is used to determine that the target parameter selection is unreasonable and reselect the target parameter of the frequency division type disconnector 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 above-mentioned target parameters is reasonable when the difference between the above-mentioned first current response and the above-mentioned second current response is less than or equal to the above-mentioned first set difference and / or the difference between the above-mentioned first voltage response and the above-mentioned second voltage response is less than or equal to the above-mentioned second set difference.

[0123] In the above embodiment, the circuit simulation of the new disconnector mainly includes a heating resistor, a frequency division inductor and a discharge gap. In EMTP-ATP, it is impossible to use a static model to represent the dynamic change of the discharge gap. With the help of MODELS, the arc is simulated. Figure 4 As shown, Figure 4 This is a circuit diagram for verifying the parameters of a new type of frequency-dividing disconnector provided according to an embodiment of the present invention. Under the action of the frequency-dividing inductance, the lightning current and the operating overcurrent will flow through the discharge gap on the right, while the power frequency current will flow through the circuit on the left. If the current is too large, it will discharge through the gap to protect the heating resistor. Figure 4 It includes an AC voltage source, an inductor, two sliding rheostats, two resistors and two MODELS models simulating arcs. Both XX0004 and XX0005 are MODELS models simulating arcs. The voltage source is connected to the first element, the MODELS model numbered XX0004 is connected to the second element, and the MODELS model numbered XX0005 is connected to the third element. The first element is used to read the voltage of the node, the second element is used to read the arc conductance value of the MODELS model numbered XX0004, and the third element is used to read the arc conductance value of the MODELS model numbered XX0005. The coding diagram for using MODELS to simulate arcs is shown in the figure below. Figure 5 As shown, Mayr arc conductance equation: In the formula, u is the arc voltage, g is the arc conductivity, 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. Using the Euler method to solve the above first-order differential equation, we get Since this formula is numerically unstable, it is transformed. First, the function e x Expanded into a Taylor series Take the first two terms of the expansion and transform them to get x = 1-e -x , use x Replacement, yes so This replaces the generation of arcs. By inputting different current levels at the power supply end, the voltage and current responses at both ends of the discharge gap can be obtained to see whether the simulation results of the MODELS arc simulation are consistent with the simulation results of COMSOL. This comparison can be used to verify whether the target parameters are reasonable, and the anti-aging characteristics of the new frequency-dividing disconnector can be verified, and the more serious the damage to the lightning arrester, the faster the disconnector will act.

[0124] The device for selecting the parameters of the frequency-dividing disengager comprises a processor and a memory, wherein the acquisition unit, the calculation unit and the solution unit are stored in the memory as program units, and the processor executes the program units stored in the memory to realize the corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0125] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the problem of poor performance of the frequency-dividing decoupler due to lack of systematic selection of parameters in the prior art can be solved by adjusting kernel parameters.

[0126] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0127] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for selecting parameters of the frequency-dividing decoupler.

[0128] Specifically, the method for selecting the parameters of the frequency-dividing disconnector includes:

[0129] Step S201, obtaining initial physical parameters, the initial physical parameters at least including initial temperature, air layer flow velocity and initial pressure;

[0130] Step S202, 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 according to the electromagnetic parameters, wherein the electromagnetic parameters include electric field intensity, current density and magnetic field intensity;

[0131] Step S203, using the heat source term and the electromagnetic force to solve the energy conservation equation, mass conservation equation and momentum conservation equation under the temperature field boundary condition and the flow field boundary condition, to obtain the temperature field, velocity field and pressure field, wherein the temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the flow field boundary condition is that the fluid in the flow field is allowed to freely enter and exit;

[0132] Step S204, selecting target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the heating resistor resistance value.

[0133] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the method for selecting parameters of the frequency division type disconnector is executed when the program is run.

[0134] An embodiment of the present invention provides a frequency division type disconnector, the frequency division type disconnector includes a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0135] Step S201, obtaining initial physical parameters, the initial physical parameters at least including initial temperature, air layer flow velocity and initial pressure;

[0136] Step S202, 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 according to the electromagnetic parameters, wherein the electromagnetic parameters include electric field intensity, current density and magnetic field intensity;

[0137] Step S203, using the heat source term and the electromagnetic force to solve the energy conservation equation, mass conservation equation and momentum conservation equation under the temperature field boundary condition and the flow field boundary condition, to obtain the temperature field, velocity field and pressure field, wherein the temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the flow field boundary condition is that the fluid in the flow field is allowed to freely enter and exit;

[0138] Step S204, selecting target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the heating resistor resistance value.

[0139] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0140] Step S201, obtaining initial physical parameters, the initial physical parameters at least including initial temperature, air layer flow velocity and initial pressure;

[0141] Step S202, 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 according to the electromagnetic parameters, wherein the electromagnetic parameters include electric field intensity, current density and magnetic field intensity;

[0142] Step S203, using the heat source term and the electromagnetic force to solve the energy conservation equation, mass conservation equation and momentum conservation equation under the temperature field boundary condition and the flow field boundary condition, to obtain the temperature field, velocity field and pressure field, wherein the temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the flow field boundary condition is that the fluid in the flow field is allowed to freely enter and exit;

[0143] Step S204, selecting target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the heating resistor resistance value.

[0144] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0145] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0146] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0147] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0148] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions 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] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0151] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0152] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0153] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0154] 1) The method for selecting the parameters of the frequency-dividing disconnector of the present application comprises the following steps: first, obtaining the initial physical parameters, which include at least the initial temperature, the air layer flow velocity and the initial pressure; then, performing electric field calculation and magnetic field calculation on the initial physical parameters respectively to obtain electromagnetic parameters, and calculating the heat source term and the electromagnetic force according to the electromagnetic parameters, wherein the electromagnetic parameters include the electric field intensity, the current density and the magnetic field intensity; then, using the heat source term and the electromagnetic force to solve the energy conservation equation, the mass conservation equation and the momentum conservation equation under the temperature field boundary conditions and the flow field boundary conditions, the temperature field, the velocity field and the pressure field are obtained, wherein the temperature field boundary conditions are that the boundary heat source of the temperature field is Joule heat, and the flow field boundary conditions are that the fluid in the flow field is allowed to freely enter and exit; finally, selecting the target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor. The present application uses the coupling of electric field, magnetic field, flow field and temperature field in simulation software to simulate the actual operation of the frequency-dividing disconnector in practice, obtains the temperature field, velocity field and pressure field, and determines the resistance value of the heating resistor, the resistance value of the frequency-dividing inductor and the gap distance of the discharge gap according to the temperature field, velocity field and pressure field and verifies them. The present application solves the problem of the poor performance of the disconnector caused by the lack of systematic selection of parameters of the frequency-dividing disconnector in the prior art.

[0155] 2) The device for selecting the parameters of the frequency-dividing disconnector of the present application comprises an acquisition unit for acquiring initial physical parameters, wherein the initial physical parameters include 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 respectively to obtain electromagnetic parameters, and calculating heat source terms and electromagnetic forces according to the electromagnetic parameters, wherein the electromagnetic parameters include electric field intensity, current density and magnetic field intensity; a solution unit for solving the energy conservation equation, mass conservation equation and momentum conservation equation by using the heat source terms and the electromagnetic forces under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field, wherein the temperature field boundary conditions specify that the boundary heat source of the temperature field is Joule heat, and the flow field boundary conditions allow the fluid in the flow field to freely enter and exit; a selection unit for selecting the target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters include at least the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor. The present application uses the coupling of electric field, magnetic field, flow field and temperature field in simulation software to simulate the actual operation of the frequency-dividing disconnector in practice, obtains the temperature field, velocity field and pressure field, and determines the resistance value of the heating resistor, the resistance value of the frequency-dividing inductor and the gap distance of the discharge gap according to the temperature field, velocity field and pressure field and verifies them. The present application solves the problem of the poor performance of the disconnector caused by the lack of systematic selection of parameters of the frequency-dividing disconnector in the prior art.

[0156] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for selecting parameters of a frequency-dividing disconnector, characterized in that: include: Acquiring initial physical parameters, wherein the initial physical parameters include at least initial temperature, air layer flow velocity and initial pressure; Performing electric field calculation and magnetic field calculation on the initial physical parameters respectively to obtain electromagnetic parameters, and calculating heat source terms and electromagnetic forces according to the electromagnetic parameters, wherein the electromagnetic parameters include electric field intensity, current density and magnetic field intensity; The heat source term and the electromagnetic force are used to solve the energy conservation equation, the mass conservation equation and the momentum conservation equation under the temperature field boundary condition and the flow field boundary condition to obtain the temperature field, the velocity field and the pressure field, wherein the temperature field boundary condition is that the boundary heat source of the temperature field is Joule heat, and the flow field boundary condition is that the fluid in the flow field is allowed to freely enter and exit; The target parameters of the frequency-dividing disconnector are selected according to the temperature field, the velocity field and the pressure field. The target parameters include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor.

2. The method according to claim 1, characterized in that: The electric field calculation and the magnetic field calculation are performed on the initial physical parameters to obtain electromagnetic parameters, including: The first calculation step is to couple the electric field and the magnetic field to simulate the electrostatic field in the frequency-dividing disconnector according to the initial physical parameters and perform electric field calculation to obtain the current electric field strength and the current current density; A first judgment step, judging whether the current electric field strength and the current current density both meet 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 is a relative tolerance after the current electric field calculation, and the relative tolerance is used to measure the ratio of the difference between two iterations to the current value; When the current electric field strength and the current current density meet 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; The second calculation step is to couple the electric field and the magnetic field to simulate the magnetic field of the frequency-dividing disconnector according to the initial physical parameters and perform magnetic field calculation to obtain the current magnetic field strength; A second judgment step, judging whether the current magnetic field strength reaches a second convergence condition, the second convergence condition being that the second relative tolerance is less than a second set tolerance, the second relative tolerance being the relative tolerance after the current magnetic field calculation is performed; When the current magnetic field strength reaches the second convergence condition, the current magnetic field strength is determined as the magnetic field strength.

3. The method according to claim 2, characterized in that After determining whether both the current electric field strength and the current current density meet the first convergence condition, the method further includes: When the current electric field strength and / or the current current density do not meet the first convergence condition, the first calculation step and the first judgment step are repeatedly performed until the current electric field strength and the current current density both meet 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.

4. The method according to claim 2, characterized in that: After determining whether the current magnetic field strength reaches the second convergence condition, the method further includes: When the current magnetic field strength does not reach the second convergence condition, the second calculation step and the second judgment step are repeatedly performed until the current magnetic field strength reaches the second convergence condition, and the current magnetic field strength is determined as the magnetic field strength.

5. The method according to claim 1, characterized in that The heat source term and the electromagnetic force are calculated according to the electromagnetic parameters, including: All heat sources are calculated according to the first formula, and all the heat sources are integrated to obtain the heat source term. The first formula is: in, Q i is the heat source per unit volume per unit time, σ represents the conductivity inside the 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 of the current density and the magnetic field strength.

6. The method according to claim 1, characterized in that The heat source term and the electromagnetic force are used to solve the energy conservation equation, mass conservation equation and momentum conservation equation under the temperature field boundary conditions and the flow field boundary conditions to obtain the temperature field, velocity field and pressure field, including: When the fluid is an incompressible fluid, the energy conservation equation, the mass conservation equation and the momentum conservation equation are solved together to obtain the temperature field, the velocity field and the pressure field. The energy conservation equation is: Where ρ represents density, c p represents specific heat capacity, u represents velocity vector, T represents the temperature field, k represents thermal conductivity, Q represents the heat source term, and the mass conservation equation is: The momentum conservation equation is Wherein, λ is the viscosity, f represents the volume force of the fluid, and P represents the pressure field.

7. The method according to claim 1, characterized in that Selecting target parameters of the frequency-dividing decoupler according to the temperature field, the velocity field and the pressure field, the method further includes: According to the temperature field, the velocity field and the pressure field, the discharge gap distance and the spark gap distance are selected according to empirical data, wherein the empirical data is a data set obtained through multiple breakdown tests; Substituting the discharge gap distance or the spark gap distance into an empirical formula to obtain a breakdown voltage, and calculating the heating resistor resistance according to the breakdown voltage, the empirical formula is U=a+bD, U represents the breakdown voltage, and D represents the discharge gap distance or the spark gap distance; The inductance value of the frequency division inductor is calculated according to the resistance value of the heating resistor.

8. The method according to claim 1, characterized in that After selecting target parameters of the frequency-dividing decoupler according to the temperature field, the velocity field and the pressure field, the method further includes: According to the target parameters of the frequency-dividing disconnector, a simulation is performed in COMSOL simulation software to obtain a first current response and a first voltage response; Constructing a frequency-dividing disconnector simulation circuit, and using the Mayr arc equation in combination with the target parameters to simulate the gap structure to obtain a second current response and a second voltage response, wherein the gap structure includes a spark gap and a discharge gap; In the case where 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 division disconnector is reselected; 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, it is determined that the target parameter selection is reasonable.

9. A device for selecting parameters of a frequency-dividing disconnector, characterized in that: The device comprises: An acquisition unit, used for acquiring initial physical parameters, wherein the initial physical parameters at least include initial temperature, air layer flow velocity and initial pressure; A calculation unit, used to perform electric field calculation and magnetic field calculation on the initial physical parameters respectively to obtain electromagnetic parameters, and calculate the heat source term and electromagnetic force according to the electromagnetic parameters, wherein the electromagnetic parameters include electric field intensity, current density and magnetic field intensity; A solving unit, used for solving the energy conservation equation, the mass conservation equation and the momentum conservation equation by using the heat source term and the electromagnetic force under the temperature field boundary condition and the flow field boundary condition to obtain the temperature field, the velocity field and the pressure field, wherein the temperature field boundary condition specifies that the boundary heat source of the temperature field is Joule heat, and the flow field boundary condition allows the fluid in the flow field to freely enter and exit; A selection unit is used to select target parameters of the frequency-dividing disconnector according to the temperature field, the velocity field and the pressure field, wherein the target parameters at least include the discharge gap distance, the inductance value of the frequency-dividing inductor, the spark gap distance and the resistance value of the heating resistor.

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

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