Method and device for judging direct current arc resistance of arc chamber and computer equipment

Abstract

The application relates to a judgment method and device for DC arc resistance of an arc extinguishing chamber and a computer device. The method comprises the following steps: building an arc burning working condition simulation environment of the arc extinguishing chamber in a pre-constructed high-speed switch geometric model, calculating a gas flow field in the arc extinguishing chamber based on a real gas model of an arc magnetic fluid model, calculating distribution structures of multiple physical fields of the arc extinguishing chamber in a preset time under the arc burning working condition based on a gas flow field control equation group, a turbulence model and the gas flow field in the arc magnetic fluid model, calculating an ablation mass of the arc extinguishing chamber in the preset time under the arc burning working condition based on a radiation model and an ablation model in the arc magnetic fluid model, and evaluating the resistance characteristics of the arc extinguishing chamber based on the distribution structures of the multiple physical fields and the ablation mass of the arc extinguishing chamber in the preset time in the arc burning process. The evaluation of the long-time DC arc resistance performance of the arc extinguishing chamber can be realized based on the distribution structures of the multiple physical fields and the ablation mass of the arc extinguishing chamber in the preset time.

Description

Technical Field

[0001] The present application relates to the technical field of ultra-high voltage direct current (UHVDC) transmission equipment, and in particular to a method, device, and computer equipment for determining the DC arcing tolerance of an arc extinguishing chamber. Background Art

[0002] High-speed DC switches (HSSs) are key components in multi-terminal DC systems and even DC power grids. They are used for switching on and off third-party load terminals and for rapidly isolating DC line faults, playing a vital role in supporting the flexible and reliable operation of DC systems. According to the operating requirements of multi-terminal flexible DC systems, if a DC HSS experiences a trip in the closed state (i.e., a sudden trip without a trip command), the DC line load current is typically around 3000-5000A. Therefore, before the DC valve block power is locked, the DC HSS must be able to withstand DC arc erosion for a long time. For example, a ±800kV DC HSS must withstand 4000A / 400ms for at least five times, far exceeding the arcing time of conventional switches (which typically have an arcing time of around 1-40ms).

[0003] HSS equipment uses SF6 as the insulating and arc-extinguishing gas. In the arc-extinguishing chamber, the burning of the DC arc generates a large amount of heat, causing the air pressure within the enclosed gas chamber to rise rapidly. If the gas pressure exceeds the switch's tolerance limit, there is a risk of explosion. Furthermore, the continued burning of the arc can cause erosion of the switch contacts. Severe erosion can significantly affect the product's opening and closing performance. However, relevant technical evaluation solutions are currently lacking. First, the arcing process involves complex coupled calculations of multiple physical fields, including electric, temperature, airflow, and pressure fields. Second, the calculation of the interaction between arc plasma and matter is difficult. Third, arc tolerance tests are time-consuming and costly. Therefore, evaluating the long-duration DC arc tolerance performance of arc-extinguishing chambers has been an unresolved technical challenge both domestically and internationally. Summary of the Invention

[0004] Based on this, it is necessary to provide a method, device and computer equipment for judging the DC arc tolerance capability of the arc extinguishing chamber, which can evaluate the long-term DC arc tolerance performance of the arc extinguishing chamber based on the distribution structure of multiple physical fields and the ablation quality of the arc extinguishing chamber within a preset time, in order to solve the above technical problems.

[0005] In a first aspect, the present application provides a method for determining the DC arcing tolerance of an arc extinguishing chamber. The method comprises:

[0006] A simulation environment for arcing conditions in the arc extinguishing chamber is built within the pre-built high-speed switch geometry model, and the airflow field within the arc extinguishing chamber is calculated based on a real gas model of the arc magnetofluid model.

[0007] Based on the airflow field control equations, turbulence model and airflow field in the arc magnetofluid model, the distribution structure of multiple physical fields in the arc extinguishing chamber under arcing conditions within a preset time is calculated;

[0008] Based on the radiation model and ablation model in the arc magnetic fluid model, the ablation mass of the arc extinguishing chamber under arcing conditions is calculated within a preset time.

[0009] The tolerance characteristics of the arc extinguishing chamber are evaluated based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time.

[0010] In one embodiment, based on the airflow field control equations, turbulence model and airflow field in the arc magnetofluid model, the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under arcing conditions is calculated, including:

[0011] Based on the turbulence model, the specific source terms of the airflow field control equations in the arc magnetohydrodynamic model are determined to obtain the improved airflow field control equations.

[0012] Based on the improved airflow field control equations and airflow field, the coupling between the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber is realized, and the distribution structure of the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber within a preset time is obtained.

[0013] In one embodiment, a specific source term of the airflow field control equations in the arc magnetofluid model is determined based on the turbulence model to obtain an improved airflow field control equations, including:

[0014] Based on the turbulence model, the momentum source term of the momentum conservation equation in the airflow field control equations is determined to obtain an improved momentum conservation equation; the momentum source term includes the pressure change term, the viscosity term, and the Lorentz force term;

[0015] The energy source terms of the energy conservation equation in the airflow field control equations are determined based on the turbulence model, and an improved energy conservation equation is obtained; the energy source terms include viscous expansion terms, ohmic heat and radiation terms.

[0016] In one embodiment, based on the radiation model and the ablation model in the arc magnetic fluid model, the ablation quality of the arc extinguishing chamber in a preset time under the arcing working condition is calculated, including:

[0017] Based on the radiation model in the arc magnetofluid model, the net radiation power radiated outward by the plasma in the arc extinguishing chamber is determined;

[0018] Determine the ablation rate of the arc extinguishing chamber based on the ablation model and net radiation power in the arc magnetofluid model;

[0019] Based on the ablation rate and the preset time, the ablation quality of the arc extinguishing chamber within the preset time under the arcing working condition is obtained.

[0020] In one embodiment, determining the net radiation power radiated outward by the plasma in the arc extinguishing chamber based on the radiation model in the arc magnetofluid model includes:

[0021] Based on the radiation model in the arc magnetofluid model, the arc area in the arc extinguishing chamber is divided into the arc center net radiation area and the outer layer reabsorption area according to the radius;

[0022] The outer reabsorption zone absorbs the first proportion of the total arc center radiation energy, and the arc center net radiation zone radiates the second proportion of the total arc center radiation energy to the cold gas outside the arc; the sum of the first proportion and the second proportion is equal to 1; the second proportion of the total arc center radiation energy is the net radiation power radiated outward by the plasma in the arc extinguishing chamber.

[0023] In one embodiment, determining the ablation rate of the arc extinguishing chamber based on the ablation model and the net radiation power in the arc magnetic fluid model includes:

[0024] Obtaining a proportional coefficient of ablation energy and net radiation power used to ablate the arc extinguishing chamber within a preset time based on an ablation model;

[0025] Based on the proportionality coefficient and the net radiated power, the ablation energy used to ablate the arc extinguishing chamber within a preset time is obtained;

[0026] The ablation rate of the arc extinguishing chamber is obtained based on the ablation energy and the ablation enthalpy of the arc extinguishing chamber.

[0027] In one embodiment, obtaining the ablation quality of the arc extinguishing chamber within the preset time under the arcing condition based on the ablation rate and the preset time includes:

[0028] Divide the preset time into several time points and obtain the time step between adjacent time points;

[0029] Based on the ablation rate and time step corresponding to each time point, the ablation mass of the arc extinguishing chamber in each time step is obtained;

[0030] Based on the ablation mass of the arc extinguishing chamber in all time steps, the ablation mass of the arc extinguishing chamber in a preset time under the arcing condition is obtained.

[0031] In a second aspect, the present application further provides a device for evaluating the DC arcing tolerance of an arc extinguishing chamber, the device comprising:

[0032] The simulation module is used to build an arcing simulation environment for the arc extinguishing chamber in a pre-built high-speed switch geometry model and calculate the airflow field in the arc extinguishing chamber based on the real gas model of the arc magnetofluid model;

[0033] The physical field coupling module is used to calculate the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under arcing conditions based on the airflow field control equations and turbulence model in the arc magnetofluid model; the airflow field control equations include the mass conservation equation, momentum conservation equation, energy conservation equation and electromagnetic field equation;

[0034] The ablation mass calculation module is used to calculate the ablation mass of the arc extinguishing chamber within a preset time under arcing conditions based on the radiation model and the ablation model in the arc magnetic fluid model;

[0035] The evaluation module is used to evaluate the withstand characteristics of the arc extinguishing chamber based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time.

[0036] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the following steps are performed:

[0037] A simulation environment for arcing conditions in the arc extinguishing chamber is built within the pre-built high-speed switch geometry model, and the airflow field within the arc extinguishing chamber is calculated based on a real gas model of the arc magnetofluid model.

[0038] Based on the airflow field control equations, turbulence model and airflow field in the arc magnetofluid model, the distribution structure of multiple physical fields in the arc extinguishing chamber under arcing conditions within a preset time is calculated;

[0039] Based on the radiation model and ablation model in the arc magnetic fluid model, the ablation mass of the arc extinguishing chamber under arcing conditions is calculated within a preset time.

[0040] The tolerance characteristics of the arc extinguishing chamber are evaluated based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time.

[0041] In a fourth aspect, the present application further provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the following steps:

[0042] A simulation environment for arcing conditions in the arc extinguishing chamber is built within the pre-built high-speed switch geometry model, and the airflow field within the arc extinguishing chamber is calculated based on a real gas model of the arc magnetofluid model.

[0043] Based on the airflow field control equations, turbulence model and airflow field in the arc magnetofluid model, the distribution structure of multiple physical fields in the arc extinguishing chamber under arcing conditions within a preset time is calculated;

[0044] Based on the radiation model and ablation model in the arc magnetic fluid model, the ablation mass of the arc extinguishing chamber under arcing conditions is calculated within a preset time.

[0045] The tolerance characteristics of the arc extinguishing chamber are evaluated based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time.

[0046] The above-mentioned method, device and computer equipment for judging the DC arcing tolerance of the arc extinguishing chamber calculate the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under arcing conditions through the airflow field control equations and turbulence model in the arc magnetofluid model, which can realize the coupling of multiple physical fields and determine the influence of multiple physical fields on the dynamic distribution of the pressure field during the long-time arcing process of the DC arc, so as to make the simulation results more accurate; based on the radiation model and ablation model in the arc magnetofluid model, the ablation quality of the arc extinguishing chamber within a preset time under arcing conditions is calculated, and the ablation condition is evaluated by the ablation quality; based on the distribution structure of multiple physical fields and the ablation quality of the arc extinguishing chamber within the preset time, the long-time DC arcing tolerance performance of the arc extinguishing chamber is evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 FIG2 is an application environment diagram of a method for determining the DC arcing withstand capability of an arc extinguishing chamber according to an embodiment;

[0048] Figure 2 1 is a flow chart of a method for determining the DC arcing withstand capability of an arc extinguishing chamber in one embodiment;

[0049] Figure 3 A schematic structural diagram of an arc magnetofluid model in one embodiment;

[0050] Figure 4 A schematic diagram of a high-speed switch geometric model in another embodiment;

[0051] Figure 5 A schematic diagram of arc ablation principle in one embodiment;

[0052] Figure 6 This is a diagram showing the internal temperature field distribution structure when the arc is extinguished after the contacts are fully opened and stop moving in one embodiment;

[0053] Figure 7 This is a structural diagram of the internal pressure field distribution when the arc is extinguished after the contacts are fully opened and stop moving in one embodiment;

[0054] Figure 8 This is a diagram showing the pressure distribution structure in the arc extinguishing chamber after the arc lasts for 400ms in one embodiment;

[0055] Figure 9 A schematic diagram of a multi-physics field coupling process in one embodiment;

[0056] Figure 10 A schematic diagram of a flow chart for improving the airflow field control equations in one embodiment;

[0057] Figure 11A schematic diagram of a process for obtaining ablation quality in one embodiment;

[0058] Figure 12 FIG1 is a schematic diagram of a process for obtaining net radiated power in one embodiment;

[0059] Figure 13 is a schematic structural diagram of a radiation model in one embodiment;

[0060] Figure 14 A schematic diagram of a process for obtaining an ablation rate in one embodiment;

[0061] Figure 15 FIG1 is a schematic diagram of a process for calculating ablation quality in one embodiment;

[0062] Figure 16 This is a structural diagram of arc radiation power distribution at 3.8ms in one embodiment;

[0063] Figure 17 Schematic diagram of the structure of a device for determining the DC arcing withstand capability of an arc extinguishing chamber in one embodiment;

[0064] Figure 18 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0066] The method for judging the DC arcing tolerance of the arc extinguishing chamber provided in the embodiment of the present application can be applied to Figure 1In the application environment shown, terminal 102 provides a platform for displaying a pre-built arcing chamber arcing condition simulation environment. Terminal 102 transmits the gas properties of the arcing chamber arcing condition simulation environment to server 104. Server 104 calculates the airflow field within the arcing chamber based on the real gas model of the pre-built arc magnetofluid model. The turbulence model of the arc magnetofluid model describes the exchange of momentum and energy between fluid particles in the arcing chamber under turbulence. The arc magnetofluid model's airflow field control equations are then used to achieve coupling between multiple physical fields, obtaining the distribution structure of multiple physical fields in the arcing chamber within a preset time. Server 104 also calculates the ablation quality of the arcing chamber within a preset time under arcing conditions based on the radiation model and ablation model of the arc magnetofluid model. The arcing chamber's tolerance characteristics are evaluated based on the distribution structure of multiple physical fields and the ablation quality of the arcing chamber within the preset time. The data storage system can store data that server 104 needs to process. The data storage system can be integrated with server 104 or placed on a cloud or other network server. The terminal 102 may be, but is not limited to, various personal computers, laptop computers, smart phones, and tablet computers, etc. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers.

[0067] In one embodiment, Figure 2 As shown, a method for judging the DC arcing tolerance of an arc extinguishing chamber is provided. Figure 1 Taking the server 104 in the example as an example, the following steps are included:

[0068] Step 202 : constructing an arcing condition simulation environment of the arc extinguishing chamber in the pre-built high-speed switch geometric model, and calculating the airflow field in the arc extinguishing chamber based on a real gas model of the arc magnetofluid model.

[0069] By defining the arc extinguishing chamber geometry on a computational fluid dynamics (CFD) software platform, a high-speed switch geometric model can be obtained. By inputting the DC current and gas pressure required for arcing conditions into the high-speed switch geometric model, boundary conditions for multiple physical fields, such as the arc extinguishing chamber temperature and pressure fields, can be obtained. In this embodiment, the DC current and gas pressure inputs are limited to 4kA and 0.6 MPa, respectively, and an arcing calculation is performed for a preset time of 400ms to obtain the distribution structures of the temperature, pressure, velocity, and electromagnetic fields within the arc extinguishing chamber.

[0070] The structure of the arc magnetofluid model is as follows Figure 3As shown in Figure 1, the arc magnetofluid model includes a real gas model, a set of governing equations for the gas flow field, a turbulence model, a radiation model, and an ablation model. The Real Gas Model (RGM) is a set of program modules written in C. It encodes gas property data in arrays and, after incorporating a linear interpolation algorithm, connects to a program interface specific to the computational fluid dynamics software platform to import all required physical property data. The Real Gas Model is a universal method for importing actual gas properties. The type of physical property parameters and the form of their functions are unrestricted, allowing it to realistically reflect the actual gas properties during the arcing process.

[0071] Specifically, the arc extinguishing chamber structure, triple box and bushing volume of the high-speed switch are simplified in the computational fluid dynamics software platform, and the following is obtained: Figure 4 The high-speed switch geometric model shown in the figure inputs the specified input DC current and inflation pressure into the high-speed switch geometric model; the real gas model is connected to the program interface of the computational fluid dynamics software platform, and the gas physical properties of the arc extinguishing chamber under arcing conditions are input into the real gas model. After the high-speed switch geometric model inputs the specified input DC current and inflation pressure, the real gas properties in the arc extinguishing chamber, the airflow field in the arc extinguishing chamber, and the arcing condition simulation environment in the arc extinguishing chamber are obtained.

[0072] Step 204 , based on the airflow field control equations, turbulence model and airflow field in the arc magnetofluid model, calculate the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under the arcing working condition.

[0073] Among them, such as Figure 5 As shown, in a DC high-speed switch, during high-speed opening motion, the compressed air in the arc extinguishing chamber is rapidly compressed and ejected from the nozzle at supersonic to subsonic velocities, forming a high-speed airflow. This airflow is inevitably turbulent due to the combined physical fields of the arc extinguishing chamber nozzle structure, the DC arc plasma between the contact electrodes, and the high-speed motion of the contact electrodes. In this embodiment, a turbulence model is used to describe the exchange of momentum and energy between fluid particles in a DC high-speed switch under the influence of turbulence.

[0074] No matter how complex the fluid situation, its flow is governed by three fundamental physical principles: the law of conservation of mass, Newton's second law, and the law of conservation of energy. These three fundamental physical principles correspond to three governing equations, the airflow field governing equations: the mass conservation equation, the momentum conservation equation, and the energy conservation equation. These three equations are the mathematical descriptions of the corresponding physical principles. Multi-physics fields include airflow, pressure, temperature, electromagnetic, and velocity fields.

[0075] Figure 6 and Figure 7The temperature and pressure distribution structures within the arc extinguishing chamber are shown after the contacts are fully extended and stopped. High temperatures in the arc region diffuse into the moving arc contact and downstream of the nozzle under the influence of the surrounding cold airflow. The arc core temperature near the moving arc contact is highest, approximately 20,000K. This is due to the arc being strongly compressed by the high-pressure airflow, resulting in a smaller arc column radius, higher plasma density, and stronger radiation. This results in lower conductivity and enhanced Joule heating. At this point, the pressure within the compressed air cylinder reaches its maximum, approximately 13.6 MPa. The entire arc extinguishing chamber, excluding the arc region, remains at approximately the inflated pressure.

[0076] Specifically, the airflow field is obtained based on the real gas model of the arc magnetofluid model, and the exchange of momentum and energy between fluid particles under turbulence in the DC high-speed switch is described by the turbulence model in the arc magnetofluid model. The multiple physical fields inside the arc extinguishing chamber are coupled through the airflow field control equation group, and the distribution structure of multiple physical fields inside the arc extinguishing chamber within the preset time is obtained through the arc burning calculation of the preset time.

[0077] Step 206 : Calculate the ablation mass of the arc extinguishing chamber within a preset time under the arcing condition based on the radiation model and the ablation model in the arc magnetic fluid model.

[0078] The radiation model describes the radiant energy from the arcing zone within the arc extinguishing chamber. Part of this radiant energy is absorbed, while the remaining portion acts on the surfaces of the arc extinguishing chamber's contacts and nozzles. The solid contact and nozzle materials absorb some of this energy and transform into vapor. When the temperature of the gas in a layer of mesh near the nozzle or inner wall of the contact exceeds the boiling point of the material, ablation of the nozzle or contact will occur.

[0079] The ablation model is used to describe the ablation rate of the nozzle or contact of the arc extinguishing chamber, and the ablation quality of the nozzle or contact is obtained by multiplying the ablation rate and the preset time.

[0080] Specifically, the net radiation power radiated outward by the plasma in the arc extinguishing chamber is calculated according to the radiation model in the arc magnetofluid model, and the ablation mass of the arc extinguishing chamber within a preset time under arcing conditions is calculated based on the ablation model and the net radiation power in the arc magnetofluid model.

[0081] Step 208 : Evaluate the tolerance characteristics of the arc extinguishing chamber based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time.

[0082] The arc extinguishing chamber's tolerance characteristics include its pressure tolerance and ablation condition. The pressure tolerance is evaluated by the distribution structure of the temperature and pressure fields during the arcing process, while the ablation condition is evaluated by the ablation quality.

[0083] For example, the input DC current and inflation pressure are limited to 4KA and 0.6Mpa respectively, and the arcing calculation is carried out for a preset time of 400ms to obtain the distribution structure of multiple physical fields during the arcing process, among which, Figure 8 A diagram of the pressure field distribution structure in the arc extinguishing chamber after the arc lasts for 400ms is provided. The maximum pressure is 0.67Mpa. Compared with the initial inflation pressure of 0.6Mpa, the increase is not obvious, and no explosion problem will occur. It can be considered that the arc extinguishing chamber has good pressure tolerance performance for long-term arcing.

[0084] Specifically, the pressure distribution results obtained at different times in the arc extinguishing chamber are compared with the pressure tolerance limit of the arc extinguishing chamber to determine the pressure tolerance of the arc extinguishing chamber under arcing conditions. If the difference between the maximum pressure in the arc extinguishing chamber and the initial specified pressure value is less than a first preset threshold value, it is considered that the arc extinguishing chamber will not explode and the arc extinguishing chamber has good pressure tolerance under arcing conditions. If the difference between the maximum pressure in the arc extinguishing chamber and the initial specified pressure value is greater than the first preset threshold value, it is considered that the pressure tolerance of the arc extinguishing chamber under arcing conditions is poor and the arc extinguishing chamber has explosion problems. The ablation mass under arcing is calculated according to the ablation model and compared with the mass of the contact or nozzle itself to determine the ablation effect of the arc on the contact and nozzle. If the difference between the ablation mass and the mass of the contact or nozzle itself is greater than a second preset threshold value, it is considered that the ablation is serious and the arc extinguishing chamber has poor tolerance. If the difference between the ablation mass and the mass of the contact or nozzle itself is less than the second preset threshold value, it is considered that the ablation condition is not serious and the arc extinguishing chamber has good tolerance.

[0085] In the above-mentioned method for judging the DC arc-burning tolerance of the arc extinguishing chamber, the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under the arc-burning condition is calculated through the airflow field control equations and turbulence model in the arc magnetofluid model, which can realize the coupling of multiple physical fields and determine the influence of multiple physical fields on the dynamic distribution of the pressure field during the long-time arcing process of the DC arc, so as to make the simulation results more accurate; based on the radiation model and ablation model in the arc magnetofluid model, the ablation quality of the arc extinguishing chamber within a preset time under the arc-burning condition is calculated, and the ablation condition is evaluated by the ablation quality; based on the distribution structure of multiple physical fields and the ablation quality of the arc extinguishing chamber within the preset time, the long-time DC arc-burning tolerance performance of the arc extinguishing chamber is evaluated.

[0086] In one embodiment, Figure 9 As shown in the figure, based on the airflow field control equations, turbulence model and airflow field in the arc magnetofluid model, the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under arcing conditions is calculated, including:

[0087] Step 902 : determining specific source terms of the airflow field control equations in the arc magnetofluid model based on the turbulence model to obtain an improved airflow field control equations.

[0088] Among them, the role of the turbulence model here is to calculate the turbulent viscosity coefficient, add specific source terms to the existing airflow field control equations, obtain the airflow field control equations that take into account the influence of turbulent viscosity, and use the improved Navier-Stokes equations to describe the improved airflow field control equations.

[0089] To achieve coupling between the airflow, pressure, temperature, electromagnetic, and velocity fields, this embodiment adds electromagnetic field equations to the existing airflow control equations and considers the effects of turbulent viscosity to obtain an improved airflow control equation set. The improved Navier-Stokes equations include a transient term, a convection term, a diffusion term, and a source term. Their basic form is: transient term + convection term - diffusion term = source term.

[0090] The improved airflow field control equations include mass conservation equations, momentum conservation equations, energy conservation equations and electromagnetic field equations. Compared with the existing airflow field control equations, the momentum conservation equations and energy conservation equations have added specific source terms.

[0091] Specifically, the turbulent viscosity coefficient is calculated based on the turbulence model, the electromagnetic field equation is added to the existing airflow field control equation group, and the airflow field control equation considering the influence of turbulent viscosity is obtained based on the turbulent viscosity coefficient. Specific source terms are added to the momentum equation and energy equation of the airflow field control equation.

[0092] Step 904, based on the improved airflow field control equations and airflow field, realize the coupling between the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber, and obtain the distribution structure of the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber within the preset time.

[0093] In this embodiment, electromagnetic field equations are added to the airflow field control equations to achieve coupling between the electromagnetic field and the temperature field and pressure field; specific source terms are added to the momentum equation and energy equation of the airflow field control equations to obtain the airflow field control equations that take into account the influence of turbulent viscosity, making the coupling between multiple physical fields more accurate.

[0094] In one embodiment, Figure 10 As shown in FIG, based on the turbulence model, the specific source terms of the airflow field control equations in the arc magnetofluid model are determined, and the improved airflow field control equations are obtained, including:

[0095] Step 1002: determining the momentum source term of the momentum conservation equation in the airflow field control equations based on the turbulence model to obtain an improved momentum conservation equation; the momentum source term includes a pressure change term, a viscosity term, and a Lorentz force term.

[0096] Among them, the momentum conservation equation includes the axial momentum conservation equation and the radial momentum conservation equation.

[0097] The improved axial momentum conservation equation is described by the improved Navier-Stokes equations as follows:

[0098]

[0099] The improved radial momentum conservation equation is described by the improved Navier-Stokes equations as follows:

[0100]

[0101] The mass conservation equation is:

[0102] The electromagnetic field equation is:

[0103] Where z is the axial direction; r is the radial direction; θ is the angular direction; t is the time / s; ρ is the density / kg·m -3 ;p-air pressure / Pa; - velocity vector; v- radial velocity / m·s -1 ;w-axial speed / m·s -1 ;μ l- Laminar viscosity / kg·m -1 ·s -1 ;μ t -Turbulent viscosity / kg·m -1 ·s -1 ; B θ - Angular component of magnetic induction intensity / T·m -1 ; J z -Axial current density / A·m -2 ; J r -Radial current density A·m -2 ; μ0-vacuum magnetic permeability / H·m -1 ; -viscous term; σ-conductivity / S·m -1 ; - potential / V. Where, Corresponding pressure change term; Corresponding to the viscosity term; J r B θ and J z B θ corresponds to the Lorentz force term.

[0104] Step 1004 , determining the energy source term of the energy conservation equation in the airflow field control equations based on the turbulence model to obtain an improved energy conservation equation; the energy source term includes viscous expansion term, ohmic heat and radiation term.

[0105] Among them, the improved energy conservation equation is described by the improved Navier-Stokes equations as follows:

[0106]

[0107] q-radiation term / J·m -3 ;k l -Laminar thermal conductivity / W·m -1 ·K -1 ;k t -Turbulent thermal conductivity / W·m -1 ·K -1 ; h-enthalpy value / J·kg -1 ;c p -Specific heat at constant pressure / J·kg -1 ·K -1 ; -viscous diffusion term; E-electric field strength V / m. Corresponding to the viscous expansion term; σE 2 corresponds to Ohmic heat; q corresponds to the radiation term.

[0108] In one embodiment, Figure 11 As shown in the figure, based on the radiation model and ablation model in the arc magnetic fluid model, the ablation quality of the arc extinguishing chamber in the preset time under the arcing condition is calculated, including:

[0109] Step 1102: determine the net radiation power radiated outward by the plasma in the arc extinguishing chamber based on the radiation model in the arc magnetic fluid model.

[0110] Among them, the temperature of the arc center of the arc in the arc extinguishing chamber is the highest, and the temperature of the area away from the arc center gradually decreases. A part of the arc center energy is absorbed by the arc extinguishing chamber, and the unabsorbed energy is radiated outward in the form of plasma. The energy radiated outward by the plasma is the net radiation power. The net radiation power acts on the contact and nozzle surface of the arc extinguishing chamber. The solid contact and nozzle materials absorb part of the energy and turn into vapor. When the temperature of the gas in a layer of grid near the nozzle or the inner wall of the contact reaches above the boiling point of the material, the nozzle or contact will undergo ablation. In this embodiment, Q is used to represent the total energy radiated from the arc center of the arc area in the arc extinguishing chamber, and Q r Represents the net radiated power.

[0111] Specifically, the total energy radiated from the arc center of the arc region in the arc extinguishing chamber and the energy absorbed by the arc extinguishing chamber are determined by the radiation model in the arc magnetofluid model, and the net radiation power is determined based on the difference between the total energy radiated from the arc center and the energy absorbed by the arc extinguishing chamber.

[0112] Step 1104 : determining the ablation rate of the arc extinguishing chamber based on the ablation model and the net radiation power in the arc magnetic fluid model.

[0113] If the effect of heat conduction is ignored, part of the net radiation power is lost in other forms, and the remaining power is the ablation energy used for ablation. The ablation energy is recorded as Q a , that is, Q a is the net radiated power Q r The proportion of the dimensionless coefficient f a Indicates that, according to the proportional coefficient f a and the net radiated power Q r The ablation energy Q is determined by multiplying a .

[0114] The mathematical expression of the ablation model is: Where: m a -Ablation rate / kg·s -1 ;Q r -Net radiated power / W·m -2 ;f a - Ablation energy Q used to ablate the nozzle material a Net radiated power Q r ratio; H-ablation enthalpy / J·kg -1 Ablation enthalpy is actually a unified treatment of many physical processes in the entire ablation process, including heating, phase change, etc., and represents the energy required to produce unit mass of ablation products.

[0115] Specifically, the ablation enthalpy of the arc extinguishing chamber is obtained based on historical ablation data or other experimental data, and the ablation energy Q used to ablate the nozzle material is determined using the net radiation coefficient method. a Net radiated power Q r The proportionality coefficient is used to calculate the ablation rate of the arc extinguishing chamber based on the mathematical expression of the ablation model, the known ablation enthalpy and the known proportionality coefficient.

[0116] Step 1106 , based on the ablation rate and the preset time, obtaining the ablation mass of the arc extinguishing chamber within the preset time under the arcing working condition.

[0117] Among them, the ablation mass per unit time can be obtained by calculating the product of the net radiation power at each moment and the time step per unit time. By accumulating the ablation mass per unit time within the preset time, the ablation mass of the arc extinguishing chamber within the preset time can be calculated.

[0118] Specifically, the preset time is divided into several time slices according to the unit time, the ablation mass of each time slice is calculated, and the ablation mass of each time segment is accumulated. The accumulated result is the ablation mass of the arc extinguishing chamber within the preset time under the arcing condition.

[0119] In this embodiment, the net radiation power used to ablate the arc extinguishing chamber is obtained through a radiation model, and an ablation model is established based on the radiation model. The ablation mass of the arc extinguishing chamber within a preset time can be calculated based on the net radiation power and the ablation model. The ablation mass can reflect the ablation effect of the arc on the nozzle and contact materials during long-term DC arc burning.

[0120] In one embodiment, Figure 12 As shown, the net radiation power radiated outward by the plasma in the arc extinguishing chamber is determined based on the radiation model in the arc magnetofluid model, including:

[0121] Step 1202: Based on the radiation model in the arc magnetic fluid model, the arc region in the arc extinguishing chamber is divided into an arc core net radiation region and an outer layer reabsorption region according to the radius.

[0122] The structure of the radiation model is as follows: Figure 13 As shown, assuming that the arc is a rotation axis symmetrical structure, the horizontal coordinate of the radiation model is the arc radius, and the vertical coordinate is the arc center temperature, which is given by Figure 13 It can be seen that the radial temperature of the radiation model changes monotonically, that is, the highest temperature at the arc center is Tm, and the arc temperature gradually decreases when moving away from the center of the arc column. Figure 13 The monotonic curve shown describes the relationship between arc core temperature and arc radius. The arc area inside the arc extinguishing chamber is divided into the arc core net radiation area and the outer layer reabsorption area according to the radius.

[0123] Specifically, the structure of the radiation model is obtained. In the ordinate of the radiation model, the point at 83% of the maximum arc temperature is marked as 83%Tm. The corresponding coordinate of the point at 83%Tm on the monotonic curve is marked as R83%Tm. The corresponding coordinate of the point at an arc temperature of 4 kK in the ordinate of the radiation model on the monotonic curve is marked as R4000K. R83%Tm and R4000K are used as the dividing line between the arc center net radiation zone and the outer reabsorption zone. The area with a radius less than R83%Tm is divided into the arc center net radiation zone, and the area with a radius greater than R83%Tm and less than R4000K is divided into the outer reabsorption zone.

[0124] In step 1204, the outer reabsorption zone absorbs a first proportion of the total arc center radiation energy, and the arc center net radiation zone radiates a second proportion of the total arc center radiation energy to the cold gas outside the arc; the sum of the first proportion and the second proportion is equal to 1; the second proportion of the total arc center radiation energy is the net radiation power radiated outward by the plasma in the arc extinguishing chamber.

[0125] The outer reabsorption zone is used to absorb a first percentage of the total arc center radiation energy, while the remaining energy is radiated into the cold gas surrounding the arc via the arc center net radiation zone. The first and second percentages can be derived from simulation data. In this embodiment, based on the material properties of the arc extinguishing chamber, it is known that the arc extinguishing chamber can absorb 80% of the total arc center radiation energy, while the remaining 20% ​​of the total arc center radiation energy is radiated into the cold gas surrounding the arc extinguishing chamber, resulting in a net radiation power of 20% of the total arc center radiation energy. Therefore, the first percentage is set to 80%, and the second percentage is set to 20%.

[0126] Specifically, the values ​​of the first proportion and the second proportion, as well as the total energy of arc center radiation are obtained according to simulation data, and the net radiation power radiated outward by the plasma in the arc extinguishing chamber is obtained according to the product of the second proportion and the total energy of arc center radiation.

[0127] In this embodiment, by setting the structure of the radiation model to include the arc center net radiation zone and the outer reabsorption zone, the temperature change of the arc area can be simulated, and the total energy of the arc center radiation, the arc center radiation energy that can be absorbed by the arc extinguishing chamber, and the net radiation power radiated outward by the plasma in the arc extinguishing chamber can be obtained, providing data for calculating the ablation quality of the arc extinguishing chamber.

[0128] In one embodiment, Figure 14 As shown in the figure, based on the ablation model and net radiation power in the arc magnetofluid model, the ablation rate of the arc extinguishing chamber is determined, including:

[0129] Step 1402 : Obtain a proportional coefficient of the ablation energy and the net radiation power used for ablating the arc extinguishing chamber within a preset time based on the ablation model.

[0130] Among them, when the net radiation coefficient method is used to consider the arc heat radiation process, 10% of the net radiation power reaching the peripheral space is lost in other forms, so the ablation energy is 18% of the net radiation power. It can be seen that the ratio coefficient of ablation energy to net radiation power within the preset time is 0.18, that is, f a =0.18, the ablation energy is Q a =0.18Q r .

[0131] Specifically, the net radiation coefficient method is used to determine the energy dissipated in other forms by the net radiation power during the arc thermal radiation process. After deducting the dissipated energy from the net radiation power, the remaining energy is the ablation energy used to ablate the arc extinguishing chamber, and the proportional coefficient of the ablation energy to the net radiation power is calculated.

[0132] Step 1404 : Obtaining ablation energy for ablating the arc extinguishing chamber within a preset time based on the proportional coefficient and the net radiation power.

[0133] The product of the proportional coefficient and the net radiation power is the ablation energy used to ablate the arc extinguishing chamber within the preset time.

[0134] Step 1406: Obtain the ablation rate of the arc extinguishing chamber based on the ablation energy and the ablation enthalpy of the arc extinguishing chamber.

[0135] The ratio of the ablation energy to the ablation enthalpy of the arc extinguishing chamber is the ablation rate of the arc extinguishing chamber. The ablation enthalpy of the arc extinguishing chamber is related to the material properties of the arc extinguishing chamber. For example, the ablation enthalpy of the nozzle is 1.19×10 7 J·kg -1 The ablation enthalpy of the contact copper is 4.77×10 6 J·kg -1 .

[0136] In this embodiment, the net radiation coefficient method is used to consider the situation where the net radiation power is lost in other forms during the arc heat radiation process, so that a more accurate simulation environment and a more realistic ablation energy for ablating the arc extinguishing chamber can be obtained, providing data for calculating the ablation quality of the arc extinguishing chamber.

[0137] In one embodiment, Figure 15 As shown, based on the ablation rate and the preset time, the ablation quality of the arc extinguishing chamber within the preset time under the arcing working condition is obtained, including:

[0138] Step 1502: Divide the preset time into several time points, and obtain the time step between adjacent time points.

[0139] The preset time in this embodiment is 400ms. Taking 1ms as the unit time, for example, 400ms can be divided into 400 time points, and the time step between each time point is 1ms.

[0140] Step 1504 : Based on the ablation rate and time step corresponding to each time point, obtain the ablation mass of the arc extinguishing chamber in each time step.

[0141] The ablation mass per unit time can be obtained by calculating the product of the net radiation power at each moment and the time step per unit time through the radiation model. The mathematical expression of the ablation mass per unit time is: M = m a T, where T is the time step per unit time.

[0142] Specifically, taking the ablation quality corresponding to the 3.8ms moment as an example, Figure 16 Provides a net radiated power Q at 3.8ms r The distribution map of Figure 16 It can be seen that the net radiation power Q at 3.8ms is r , the net radiation power Q at this moment r Multiply by the proportional coefficient f aThe ablation energy used to ablate the arc extinguishing chamber at that moment can be obtained, the ablation rate at that moment is determined based on the ratio of the ablation energy to the ablation enthalpy at that moment, and the ablation mass of the arc extinguishing chamber within the time step is determined based on the product of the ablation rate at that moment and the time step.

[0143] Step 1506 : Based on the ablation mass of the arc extinguishing chamber in all time steps, the ablation mass of the arc extinguishing chamber in a preset time under the arcing working condition is obtained.

[0144] The ablation mass of the arc extinguishing chamber within the preset time can be calculated by accumulating the ablation mass per unit time within the preset time.

[0145] The preset time of this embodiment is 400ms. Taking 1ms as an example, 400ms includes 400 unit time. The ablation mass within 400ms is determined by accumulating the ablation mass of 400 unit time. The ablation enthalpy of the nozzle of this embodiment is 1.19×10 7 J·kg -1 The ablation enthalpy of the contact copper is 4.77×10 6 J·kg -1 Considering only contact erosion, the calculated contact erosion amount is approximately 5.74g. This result indicates that severe erosion occurs during the 400ms arcing process. However, due to the contact mass of 2.5kg, the overall contact morphology is minimally affected, remaining within the acceptable range for normal operation. This indicates that the arc extinguishing chamber has successfully withstood long-duration DC arcing.

[0146] Specifically, the ablation mass of each time slice is calculated according to the mathematical expression of the ablation mass per unit time, the ablation mass of each time slice is accumulated, and the accumulated result is the ablation mass of the arc extinguishing chamber within the preset time.

[0147] In this embodiment, the ablation mass of the arc extinguishing chamber within the preset time is obtained by accumulating the ablation mass per unit time within the preset time, so that the ablation mass of the arc extinguishing chamber within the preset time can be calculated more accurately.

[0148] Based on the same inventive concept, embodiments of the present application further provide a device for determining the DC arc withstand capability of an arc extinguishing chamber, for implementing the aforementioned method for determining the DC arc withstand capability of an arc extinguishing chamber. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the device for determining the DC arc withstand capability of an arc extinguishing chamber provided below can be found in the aforementioned method for determining the DC arc withstand capability of an arc extinguishing chamber, and will not be further elaborated here.

[0149] In one embodiment, Figure 17As shown, a judgment device for DC arc resistance of an arc-extinguishing chamber is provided, comprising: a simulation module, a physical field coupling module, an ablation mass calculation module, and an evaluation module, wherein:

[0150] The simulation module is configured to build an arc working condition simulation environment of the arc-extinguishing chamber in a pre-constructed high-speed switch geometric model, and calculate a gas flow field in the arc-extinguishing chamber based on a real gas model of an arc magneto-fluid model.

[0151] The physical field coupling module is configured to calculate a distribution structure of multiple physical fields of the arc-extinguishing chamber within a preset time under the arc working condition based on a gas flow field control equation set and a turbulence model in the arc magneto-fluid model; the gas flow field control equation set comprises a mass conservation equation, a momentum conservation equation, an energy conservation equation, and an electromagnetic field equation.

[0152] The ablation mass calculation module is configured to calculate an ablation mass of the arc-extinguishing chamber within the preset time under the arc working condition based on a radiation model and an ablation model in the arc magneto-fluid model.

[0153] The evaluation module is configured to evaluate the resistance characteristics of the arc-extinguishing chamber based on the distribution structure of the multiple physical fields in the arc process and the ablation mass of the arc-extinguishing chamber within the preset time.

[0154] In one embodiment, the judgment device for DC arc resistance of an arc-extinguishing chamber further comprises:

[0155] The equation set improvement module is configured to determine a specific source term of the gas flow field control equation set in the arc magneto-fluid model based on the turbulence model, and obtain an improved gas flow field control equation set.

[0156] The coupling module is configured to realize coupling between a temperature field, a pressure field, a velocity field, and an electromagnetic field inside the arc-extinguishing chamber based on the improved gas flow field control equation set and the gas flow field, and obtain a distribution structure of the temperature field, the pressure field, the velocity field, and the electromagnetic field inside the arc-extinguishing chamber within the preset time.

[0157] In one embodiment, the judgment device for DC arc resistance of an arc-extinguishing chamber further comprises:

[0158] The momentum source term determination module is configured to determine a momentum source term of the momentum conservation equation in the gas flow field control equation set based on the turbulence model, and obtain an improved momentum conservation equation; the momentum source term comprises a pressure variation term, a viscosity term, and a Lorentz force term.

[0159] The energy source term determination module is configured to determine an energy source term of the energy conservation equation in the gas flow field control equation set based on the turbulence model, and obtain an improved energy conservation equation; the energy source term comprises a viscosity expansion term, an Ohmic heat term, and a radiation term.

[0160] In one embodiment, the judgment device for DC arc resistance of an arc-extinguishing chamber further comprises:

[0161] The net radiation power acquisition module is used to determine the net radiation power radiated outward by the plasma in the arc extinguishing chamber based on the radiation model in the arc magnetofluid model.

[0162] The ablation rate confirmation module is used to determine the ablation rate of the arc extinguishing chamber based on the ablation model and the net radiation power in the arc magnetic fluid model.

[0163] The ablation mass acquisition module is used to obtain the ablation mass of the arc extinguishing chamber within a preset time under arcing conditions based on the ablation rate and the preset time.

[0164] In one embodiment, a device for determining the DC arcing tolerance of an arc extinguishing chamber further includes:

[0165] The partition module is used to divide the arc area in the arc extinguishing chamber into the arc center net radiation area and the outer reabsorption area according to the radius based on the radiation model in the arc magnetofluid model.

[0166] In the radiation module, the outer reabsorption zone absorbs a first proportion of the total arc center radiation energy, and the arc center net radiation zone radiates a second proportion of the total arc center radiation energy to the cold gas outside the arc; the sum of the first proportion and the second proportion is equal to 1; the second proportion of the total arc center radiation energy is the net radiation power radiated outward by the plasma in the arc extinguishing chamber.

[0167] In one embodiment, a device for determining the DC arcing tolerance of an arc extinguishing chamber further includes:

[0168] The proportional coefficient determination module is used to obtain the proportional coefficient of the ablation energy and the net radiation power used for ablating the arc extinguishing chamber within a preset time based on the ablation model.

[0169] The ablation energy determination module is used to obtain the ablation energy used to ablate the arc extinguishing chamber within a preset time based on the proportional coefficient and the net radiation power.

[0170] The ablation rate calculation module is used to obtain the ablation rate of the arc extinguishing chamber based on the ablation energy and the ablation enthalpy of the arc extinguishing chamber.

[0171] In one embodiment, a device for determining the DC arcing tolerance of an arc extinguishing chamber further includes:

[0172] The division module is used to divide the preset time into several time points and obtain the time step between adjacent time points.

[0173] The ablation mass per unit time calculation module is used to obtain the ablation mass of the arc extinguishing chamber in each time step based on the ablation rate and time step corresponding to each time point;

[0174] The accumulation module is used to obtain the ablation mass of the arc extinguishing chamber within a preset time under the arcing working condition based on the ablation mass of the arc extinguishing chamber in all time steps.

[0175] Each module in the aforementioned device for determining the DC arcing withstand capability of an arc extinguishing chamber may be implemented in whole or in part via software, hardware, or a combination thereof. Each module may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0176] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 18 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface, the display unit and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for judging the DC arcing tolerance of an arc extinguishing chamber is implemented. The display unit of the computer device is used to form a visually visible image, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a key, trackball or touchpad of the device on the computer device casing, or an external keyboard, touchpad or mouse, etc.

[0177] Those skilled in the art will understand that Figure 18 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0178] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0179] A simulation environment for arcing conditions in the arc extinguishing chamber is built within the pre-built high-speed switch geometry model, and the airflow field within the arc extinguishing chamber is calculated based on a real gas model of the arc magnetofluid model.

[0180] Based on the airflow field control equations, turbulence model and airflow field in the arc magnetofluid model, the distribution structure of multiple physical fields in the arc extinguishing chamber under arcing conditions within a preset time is calculated;

[0181] Based on the radiation model and ablation model in the arc magnetic fluid model, the ablation mass of the arc extinguishing chamber under arcing conditions is calculated within a preset time.

[0182] The tolerance characteristics of the arc extinguishing chamber are evaluated based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time.

[0183] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0184] Based on the turbulence model, the specific source terms of the airflow field control equations in the arc magnetofluid model are determined to obtain the improved airflow field control equations.

[0185] Based on the improved airflow field control equations and airflow field, the coupling between the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber is realized, and the distribution structure of the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber within a preset time is obtained.

[0186] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0187] Based on the turbulence model, the momentum source term of the momentum conservation equation in the airflow field control equations is determined to obtain the improved momentum conservation equation; the momentum source term includes the pressure change term, the viscosity term and the Lorentz force term;

[0188] The energy source terms of the energy conservation equation in the airflow field control equations are determined based on the turbulence model, and an improved energy conservation equation is obtained; the energy source terms include viscous expansion terms, ohmic heat and radiation terms.

[0189] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0190] Based on the radiation model in the arc magnetofluid model, the net radiation power radiated outward by the plasma in the arc extinguishing chamber is determined;

[0191] Determine the ablation rate of the arc extinguishing chamber based on the ablation model and net radiation power in the arc magnetofluid model;

[0192] Based on the ablation rate and the preset time, the ablation quality of the arc extinguishing chamber within the preset time under the arcing working condition is obtained.

[0193] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0194] According to the radiation model in the arc MHD model, the arc region in the arc chamber is divided into a central arc radiation zone and an outer reabsorption zone according to the radius;

[0195] The outer reabsorption zone absorbs a first proportion of the total arc center radiation energy, and the central arc radiation zone radiates a second proportion of the total arc center radiation energy to the cold gas outside the arc; the sum of the first proportion and the second proportion is equal to 1; the second proportion of the total arc center radiation energy is the net radiation power of the plasma in the arc chamber radiating outward.

[0196] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0197] According to the ablation model, a proportionality coefficient of the ablation energy for ablating the arc chamber and the net radiation power in a preset time is obtained;

[0198] Based on the proportionality coefficient and the net radiation power, the ablation energy for ablating the arc chamber in the preset time is obtained;

[0199] Based on the ablation energy and the ablation enthalpy of the arc chamber, the ablation rate of the arc chamber is obtained.

[0200] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0201] The preset time is divided into a plurality of time points, and a time step between adjacent time points is obtained;

[0202] Based on the ablation rate corresponding to each time point and the time step, the ablation mass of the arc chamber in each time step is obtained;

[0203] Based on the ablation mass of the arc chamber in all time steps, the ablation mass of the arc chamber in the preset time under the arc burning condition is obtained.

[0204] In one embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the following steps:

[0205] In the pre-constructed high-speed switch geometric model, a simulation environment of the arc burning condition of the arc chamber is built, and a real gas model based on the arc MHD model is used to calculate the gas flow field in the arc chamber;

[0206] Based on the gas flow field control equation set, the turbulence model and the gas flow field in the arc MHD model, the distribution structure of a plurality of physical fields of the arc chamber in the preset time under the arc burning condition is calculated;

[0207] Based on the radiation model and ablation model in the arc magnetic fluid model, the ablation mass of the arc extinguishing chamber under arcing conditions is calculated within a preset time.

[0208] The tolerance characteristics of the arc extinguishing chamber are evaluated based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time.

[0209] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0210] Based on the turbulence model, the specific source terms of the airflow field control equations in the arc magnetofluid model are determined to obtain the improved airflow field control equations.

[0211] Based on the improved airflow field control equations and airflow field, the coupling between the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber is realized, and the distribution structure of the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber within a preset time is obtained.

[0212] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0213] Based on the turbulence model, the momentum source term of the momentum conservation equation in the airflow field control equations is determined to obtain the improved momentum conservation equation; the momentum source term includes the pressure change term, the viscosity term and the Lorentz force term;

[0214] The energy source terms of the energy conservation equation in the airflow field control equations are determined based on the turbulence model, and an improved energy conservation equation is obtained; the energy source terms include viscous expansion terms, ohmic heat and radiation terms.

[0215] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0216] Based on the radiation model in the arc magnetofluid model, the net radiation power radiated outward by the plasma in the arc extinguishing chamber is determined;

[0217] Determine the ablation rate of the arc extinguishing chamber based on the ablation model and net radiation power in the arc magnetofluid model;

[0218] Based on the ablation rate and the preset time, the ablation quality of the arc extinguishing chamber within the preset time under the arcing working condition is obtained.

[0219] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0220] Based on the radiation model in the arc magnetofluid model, the arc area in the arc extinguishing chamber is divided into the arc center net radiation area and the outer layer reabsorption area according to the radius;

[0221] The outer reabsorption zone absorbs the first proportion of the total arc center radiation energy, and the arc center net radiation zone radiates the second proportion of the total arc center radiation energy to the cold gas outside the arc; the sum of the first proportion and the second proportion is equal to 1; the second proportion of the total arc center radiation energy is the net radiation power radiated outward by the plasma in the arc extinguishing chamber.

[0222] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0223] Obtaining a proportional coefficient of ablation energy and net radiation power used to ablate the arc extinguishing chamber within a preset time based on an ablation model;

[0224] Based on the proportionality coefficient and the net radiated power, the ablation energy used to ablate the arc extinguishing chamber within a preset time is obtained;

[0225] The ablation rate of the arc extinguishing chamber is obtained based on the ablation energy and the ablation enthalpy of the arc extinguishing chamber.

[0226] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0227] Divide the preset time into several time points and obtain the time step between adjacent time points;

[0228] Based on the ablation rate and time step corresponding to each time point, the ablation mass of the arc extinguishing chamber in each time step is obtained;

[0229] Based on the ablation mass of the arc extinguishing chamber in all time steps, the ablation mass of the arc extinguishing chamber in a preset time under the arcing condition is obtained.

[0230] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0231] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions.

[0232] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0233] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0234] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for determining the DC arcing tolerance of an arc extinguishing chamber, characterized in that: The method comprises: A simulation environment for arcing conditions in an arc extinguishing chamber is built in a pre-built high-speed switch geometric model, and the airflow field in the arc extinguishing chamber is calculated based on a real gas model of the arc magnetofluid model. Based on the airflow field control equations, turbulence model and the airflow field in the arc magnetofluid model, the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under arcing conditions is calculated; Based on the radiation model and the ablation model in the arc magnetic fluid model, the ablation mass of the arc extinguishing chamber within a preset time under the arcing condition is calculated; Evaluating the tolerance characteristics of the arc extinguishing chamber based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time; The method of calculating the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under arcing conditions based on the airflow field control equations, the turbulence model and the airflow field in the arc magnetofluid model includes: Based on the turbulence model, the specific source terms of the airflow field control equations in the arc magnetohydrodynamic model are determined to obtain the improved airflow field control equations. Based on the improved airflow field control equations and the airflow field, coupling between the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber is achieved, and the distribution structure of the temperature field, pressure field, velocity field and electromagnetic field inside the arc extinguishing chamber within a preset time is obtained; The calculation of the ablation quality of the arc extinguishing chamber within a preset time under the arcing condition based on the radiation model and the ablation model in the arc magnetic fluid model includes: Determining the net radiation power radiated outward by the plasma in the arc extinguishing chamber based on the radiation model in the arc magnetic fluid model; Determining an ablation rate of the arc extinguishing chamber based on an ablation model in an arc magnetic fluid model and the net radiation power; Based on the ablation rate and the preset time, the ablation mass of the arc extinguishing chamber within the preset time under the arcing condition is obtained.

2. The method according to claim 1, characterized in that The specific source terms of the airflow field control equations in the arc magnetofluid model are determined based on the turbulence model to obtain the improved airflow field control equations, including: Based on the turbulence model, the momentum source term of the momentum conservation equation in the airflow field control equations is determined to obtain an improved momentum conservation equation; the momentum source term includes the pressure change term, the viscosity term, and the Lorentz force term; The energy source terms of the energy conservation equation in the airflow field control equations are determined based on the turbulence model, and an improved energy conservation equation is obtained; the energy source terms include viscous expansion terms, ohmic heat and radiation terms.

3. The method according to claim 1, characterized in that The determining of the net radiation power radiated outward by the plasma in the arc extinguishing chamber based on the radiation model in the arc magnetic fluid model includes: Based on the radiation model in the arc magnetic fluid model, the arc area in the arc extinguishing chamber is divided into an arc core net radiation area and an outer layer reabsorption area according to the radius; The outer reabsorption zone absorbs a first proportion of the total arc center radiation energy, and the arc center net radiation zone radiates a second proportion of the total arc center radiation energy to the cold gas outside the arc; the sum of the first proportion and the second proportion is equal to 1; the second proportion of the total arc center radiation energy is the net radiation power radiated outward by the plasma in the arc extinguishing chamber.

4. The method according to claim 1, wherein The determining of the ablation rate of the arc extinguishing chamber based on the ablation model in the arc magnetic fluid model and the net radiation power includes: Obtaining a proportional coefficient between the ablation energy and the net radiation power used to ablate the arc extinguishing chamber within a preset time based on an ablation model; Based on the proportional coefficient and the net radiation power, obtaining ablation energy for ablating the arc extinguishing chamber within a preset time; An ablation rate of the arc extinguishing chamber is obtained based on the ablation energy and the ablation enthalpy of the arc extinguishing chamber.

5. The method according to claim 1, wherein The obtaining, based on the ablation rate and the preset time, the ablation quality of the arc extinguishing chamber within the preset time under the arcing working condition includes: Divide the preset time into several time points and obtain the time steps between adjacent time points; Based on the ablation rate corresponding to each time point and the time step, obtaining the ablation mass of the arc extinguishing chamber in each time step; Based on the ablation mass of the arc extinguishing chamber in all the time steps, the ablation mass of the arc extinguishing chamber in a preset time under the arcing working condition is obtained.

6. A device for evaluating the DC arcing tolerance of an arc extinguishing chamber, characterized in that: The device comprises: A simulation module is used to build an arcing condition simulation environment of the arc extinguishing chamber in a pre-built high-speed switch geometric model, and calculate the airflow field in the arc extinguishing chamber based on a real gas model of the arc magnetofluid model; A physical field coupling module is used to calculate the distribution structure of multiple physical fields in the arc extinguishing chamber within a preset time under arcing conditions based on the airflow field control equations and turbulence model in the arc magnetofluid model; the airflow field control equations include mass conservation equations, momentum conservation equations, energy conservation equations and electromagnetic field equations; an ablation mass calculation module, configured to calculate the ablation mass of the arc extinguishing chamber within a preset time under arcing conditions based on a radiation model and an ablation model in an arc magnetic fluid model; An evaluation module, configured to evaluate the tolerance characteristics of the arc extinguishing chamber based on the distribution structure of multiple physical fields during the arcing process and the ablation quality of the arc extinguishing chamber within a preset time; An equation group improvement module is used to determine specific source terms of the airflow field control equation group in the arc magnetofluid model based on the turbulence model to obtain an improved airflow field control equation group; a coupling module, configured to achieve coupling between the temperature field, pressure field, velocity field, and electromagnetic field inside the arc extinguishing chamber based on the improved airflow field control equations and the airflow field, and obtain the distribution structure of the temperature field, pressure field, velocity field, and electromagnetic field inside the arc extinguishing chamber within a preset time; A net radiation power acquisition module, configured to determine the net radiation power radiated outward by the plasma in the arc extinguishing chamber based on a radiation model in an arc magnetic fluid model; an ablation rate confirmation module, configured to determine the ablation rate of the arc extinguishing chamber based on an ablation model in an arc magnetic fluid model and the net radiation power; The ablation mass acquisition module is used to obtain the ablation mass of the arc extinguishing chamber within the preset time under the arcing working condition based on the ablation rate and the preset time.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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