A high-voltage circuit breaker arc simulation method and system based on type test data

Abstract

The present invention discloses a method and system for simulating the arc of a high-voltage circuit breaker based on type test data. The present invention includes taking the current value corresponding to the critical breaking interval data as the first boundary condition, and using a preset initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker; based on the preset zero-zone arc model, using the arc parameters of the arc simulation result as the initial condition to perform post-arc current calculation to determine the time series change of the post-arc current; comparing whether the time series change of the post-arc current is consistent with the preset time series change of the post-arc current, and determining the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result. This solves the technical problem that the arcing experiment and circuit breaker structure used in the existing technology are relatively complex, resulting in inaccurate experimental observation data. The present invention combines the two simulation methods of type test and magnetohydrodynamic simulation model, which is simple, convenient and easy to implement, and the simulation results are both intuitive and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage circuit breaker arc simulation, and in particular to a high-voltage circuit breaker arc simulation method and system based on type test data. Background Art

[0002] Circuit breakers are the most complex and important switching devices in high-voltage power system equipment. The fundamental requirement for circuit breakers in power systems is that they operate before the system's short-circuit current reaches a stable state, effectively limiting the rapid rise of the short-circuit current and promptly interrupting the fault current, thereby significantly reducing the damage to the entire system caused by the electrical and thermal effects of the fault current. Successful short-circuit current interruption requires both thermal recovery (energy recovery) and electrical recovery (dielectric recovery) of the dielectric after the arc. High-voltage circuit breakers, especially high-voltage SF6 circuit breakers, are widely used in power systems due to their excellent breaking performance, placing higher demands on their reliability and stability.

[0003] Therefore, existing technologies usually use a high-voltage circuit breaker arc magnetohydrodynamic simulation model to simulate the arc of a high-voltage circuit breaker. However, the simulation model of the above method is difficult to judge the accuracy and feasibility of its simulation results.

[0004] However, arc burning experiments are usually carried out by building an experimental platform, measuring macroscopic parameters such as arc voltage, arc current, gas pressure and magnetic field in the arc burning cavity through experiments, and comparing and analyzing the simulation results with the experimental results. However, the arc burning experiment and circuit breaker structure used in the above method are relatively complex, resulting in inaccurate experimental observation data. Summary of the Invention

[0005] The present invention provides a high-voltage circuit breaker arc simulation method and system based on type test data, which solves the technical problem that the arc burning experiment and circuit breaker structure used in the existing technology are relatively complex, resulting in inaccurate experimental observation data.

[0006] A first aspect of the present invention provides a high-voltage circuit breaker arc simulation method based on type test data, comprising:

[0007] Obtaining critical breaking interval data of the high-voltage circuit breaker according to a type test result of the high-voltage circuit breaker;

[0008] Using the current value corresponding to the critical breaking interval data as a first boundary condition, an arc simulation is performed on the arcing process of the high-voltage circuit breaker using a preset initial magnetohydrodynamic simulation model;

[0009] Based on the preset zero-zone arc model, the arc parameters of the arc simulation results are used as initial conditions to perform post-arc current calculations and determine the time series changes of the post-arc current.

[0010] Comparing whether the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and determining the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result.

[0011] Optionally, the step of obtaining critical breaking interval data of the high-voltage circuit breaker according to the type test result of the high-voltage circuit breaker includes:

[0012] Conduct type tests on high-voltage circuit breakers at preset transient recovery voltage and power frequency recovery voltage;

[0013] Determining whether the arc of the high-voltage circuit breaker reignites after being disconnected based on the type test results;

[0014] If the arc does not reignite, the critical breaking success point data is determined;

[0015] If the arc reignites, the critical breaking failure point data is determined, the rated short-circuit breaking current data is adjusted, and the step of performing a type test on the high-voltage circuit breaker under the preset transient recovery voltage and power frequency recovery voltage is skipped and executed until the arc does not reignite, and the next step is executed;

[0016] The critical breaking success point data and the critical breaking failure point data are used to generate critical breaking interval data of the high-voltage circuit breaker.

[0017] Optionally, it also includes:

[0018] Constructing control equations and a radiation model; wherein the control equations include mass conservation equations, momentum conservation equations, energy conservation equations, and electromagnetic field equations;

[0019] The control equation, the radiation model and a preset turbulence model are coupled to generate an initial magnetohydrodynamic simulation model.

[0020] Optionally, the step of performing arc simulation on the arcing process of the high-voltage circuit breaker using a preset initial magnetohydrodynamic simulation model with the current value corresponding to the critical breaking interval data as a first boundary condition includes:

[0021] Obtaining the current value of the breaking success point and the current value of the breaking failure point of the critical breaking interval data;

[0022] Taking the current value of the successful breaking point as a first boundary condition, using the initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker to generate a first arc simulation result;

[0023] Taking the current value at the breaking failure point as the first boundary condition, the initial magnetohydrodynamic simulation model is used to perform arc simulation on the arcing process of the high-voltage circuit breaker to generate a second arc simulation result.

[0024] Optionally, the step of performing post-arc current calculation based on a preset zero-zone arc model as an initial condition and determining a time sequence change of the post-arc current includes:

[0025] Extracting model parameters of a preset zero-zone arc model;

[0026] Using arc parameters corresponding to the first arc simulation result as initial conditions, and calculating first temperature data and first pressure data under the action of the transient recovery voltage according to the model parameters, the zero-zone arc model, and a preset transient recovery voltage;

[0027] Setting conductivity as a function of temperature and pressure, and calculating a first resistivity value based on the first temperature data and the first pressure data;

[0028] Determining a time sequence change of a first post-arc current under the action of the transient recovery voltage based on a voltage value corresponding to the transient recovery voltage and a first resistivity value;

[0029] Using arc parameters corresponding to the second arc simulation result as initial conditions, and calculating second temperature data and second pressure data under the action of the transient recovery voltage according to the model parameters, the zero-zone arc model, and the transient recovery voltage;

[0030] calculating a second resistivity value according to the second temperature data and the second pressure data;

[0031] Based on the voltage value corresponding to the transient recovery voltage and the second resistivity value, a time sequence change of the second post-arc current under the action of the transient recovery voltage is determined.

[0032] Optionally, the step of comparing whether the time series variation of the post-arc current is consistent with a preset time series variation of the post-arc current, and determining a target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result includes:

[0033] Based on the type test results, determining a time sequence change of a preset post-arc current;

[0034] When the time sequence change of the first post-arc current is that the arc does not reignite, and the time sequence change of the second post-arc current is that the arc reignites, it is determined that the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and the current magnetohydrodynamic simulation model is determined as the target magnetohydrodynamic simulation model of the high-voltage circuit breaker;

[0035] When the time sequence change of the first post-arc current is that the arc reignites, and the time sequence change of the second post-arc current is that the arc does not reignite, it is determined that the time sequence change of the post-arc current is inconsistent with the preset time sequence change of the post-arc current, and the model parameters and the first boundary conditions of the initial magnetohydrodynamic simulation model are optimized to generate an intermediate magnetohydrodynamic simulation model;

[0036] The intermediate magnetohydrodynamic simulation model is used as a new initial magnetohydrodynamic simulation model, and the step of performing arc simulation on the arcing process of the high-voltage circuit breaker using the preset initial magnetohydrodynamic simulation model is jumped to execution until the time sequence change of the post-arc current is consistent with the time sequence change of the preset post-arc current.

[0037] A second aspect of the present invention provides a high-voltage circuit breaker arc simulation system based on type test data, comprising:

[0038] A test module, configured to obtain critical breaking interval data of the high-voltage circuit breaker according to a type test result of the high-voltage circuit breaker;

[0039] An arc simulation module, configured to use a current value corresponding to the critical breaking interval data as a first boundary condition and adopt a preset initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker;

[0040] A calculation module is used to perform post-arc current calculation based on a preset zero-zone arc model and arc parameters of arc simulation results as initial conditions to determine the time sequence change of the post-arc current;

[0041] The comparison module is used to compare whether the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and determine the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result.

[0042] A third aspect of the present invention provides an electronic device, comprising a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the high-voltage circuit breaker arc simulation method based on type test data as described in any one of the above items.

[0043] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the high-voltage circuit breaker arc simulation method based on type test data as described in any one of the above items.

[0044] A fifth aspect of the present invention provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, wherein when the program instructions are executed by a computer, the computer is caused to execute the high-voltage circuit breaker arc simulation method based on type test data as described in any one of the above items.

[0045] It can be seen from the above technical solutions that the present invention has the following advantages:

[0046] The present invention obtains the critical breaking parameters and critical breaking points of the high-voltage circuit breaker by performing a type test on the high-voltage circuit breaker, and simulates the arcing process and post-arc of the current values ​​at the critical breaking success point and the critical breaking failure point. The temporal change of the post-arc current is compared with the type test results, and the target magnetohydrodynamic simulation model of the high-voltage circuit breaker is determined based on the comparison results. For high-voltage circuit breaker models of the same model, the type test can more intuitively and accurately judge whether the circuit breaker is breaking successfully or not. The magnetohydrodynamic simulation model judges whether the breaking is successful based on whether the arc reignites. It is simple, convenient and easy to implement. The combination of the two methods is both intuitive and accurate, avoiding the problem of complex experiments that are difficult to implement or low accuracy of judgment results. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 A flowchart of a method for simulating arc of a high-voltage circuit breaker based on type test data provided in the first embodiment of the present invention;

[0049] Figure 2 A flowchart of a method for simulating arc of a high-voltage circuit breaker based on type test data provided in a second embodiment of the present invention;

[0050] Figure 3 A flow chart showing two methods for simulating arcs in high-voltage circuit breakers according to the second embodiment of the present invention;

[0051] Figure 4 This is a structural block diagram of a high-voltage circuit breaker arc simulation system based on type test data provided in the third embodiment of the present invention;

[0052] Figure 5 This is a structural block diagram of an electronic device provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0053] The embodiments of the present invention provide a high-voltage circuit breaker arc simulation method and system based on type test data, which are used to solve the technical problem that the arc burning experiment and circuit breaker structure used in the existing technology are relatively complex, resulting in inaccurate experimental observation data.

[0054] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0055] Example 1

[0056] See also Figure 1 , Figure 1 This is a flowchart of the steps of a high-voltage circuit breaker arc simulation method based on type test data provided in Example 1 of the present invention.

[0057] The present invention provides a high-voltage circuit breaker arc simulation method based on type test data, comprising the following steps:

[0058] Step 101: Obtain critical breaking interval data of the high-voltage circuit breaker according to the type test results of the high-voltage circuit breaker.

[0059] It should be noted that type testing of high-voltage circuit breakers is conducted on a sample of a single product. Various aspects of the circuit breaker's performance and quality are studied and assessed, and the design is modified and reworked accordingly. A basic short-circuit test utilizes multiple test methods, following the rated test operation sequence, to interrupt the rated short-circuit breaking current corresponding to the percentage of each test method at the specified transient recovery voltage and power frequency recovery voltage. High-voltage circuit breakers are tested for their breaking capacity. If the arc does not reignite after the circuit breaker opens, the successful breaking point is obtained. If the arc reignites, the breaking failure is determined, resulting in the failed breaking point.

[0060] The current data near the critical breaking success point or the critical breaking failure point is regarded as the critical breaking interval data.

[0061] Step 102: Using the current value corresponding to the critical breaking interval data as the first boundary condition, a preset initial magnetohydrodynamic simulation model is used to perform arc simulation on the arcing process of the high-voltage circuit breaker.

[0062] It should be noted that a two-dimensional model of a high-voltage circuit breaker of the same model was obtained through ANSYS SpaceClaim, and the simplified two-dimensional model was meshed using ANSYS MESH meshing software. Taking into account the number and quality of meshes, a relatively complete two-dimensional dynamic theoretical model of SF6 arc was established.

[0063] Application and effect of the two-dimensional dynamic theoretical model of SF6 arc: Magnetohydrodynamic simulation model has become an effective means to study the physics and characteristic control of SF6 arc. Through extensive research on arc plasma particle composition, thermodynamic properties (including mass density, enthalpy and specific heat at constant pressure), and transport coefficients (including electrical conductivity, thermal conductivity and viscosity) and other arc physical parameters, a database of physical parameters of commonly used gas media has been basically established, including SF6, air, CO2, N2, and fluorinated gases. Compared with experimental methods, numerical simulation can more easily obtain the distribution of arc physical fields in time and space. A complete two-dimensional dynamic theoretical model of SF6 arc can more accurately describe the dynamic characteristics and arc behavior during the arc development process, and obtain more accurate arc parameters from multiple angles.

[0064] In the specific implementation, the current values ​​of multiple successful breaking points or failed breaking points of the critical breaking interval data are set as the initial boundary conditions, and the magnetohydrodynamic simulation model is used to simulate the arcing process of the high-voltage circuit breaker. Specifically, there is a complex coupling change process between the airflow field, thermal field, electromagnetic field and radiation field inside the arc plasma. The interaction between the coupled airflow field, thermal field, electromagnetic field and radiation field is described by a set of mutually coupled nonlinear complex partial differential equations based on the local thermodynamic equilibrium assumption and with the help of magnetohydrodynamic theory.

[0065] Step 103 : Based on the preset zero-zone arc model, the arc parameters of the arc simulation result are used as initial conditions to perform post-arc current calculation to determine the time sequence change of the post-arc current.

[0066] It should be noted that the simulation results of the arc burning process include data such as temperature, pressure, arc voltage, arc current, etc. Among them, the arc parameters are arc voltage and arc current.

[0067] In the specific implementation, the model parameters of the zero-zone arc model are extracted, where the model parameters include arc parameters and circuit breaker parameters; the arc voltage and arc current are used as initial conditions, and the post-arc current under the action of the transient recovery voltage is calculated based on the zero-zone arc model, model parameters and preset transient recovery voltage.

[0068] Step 104 : comparing whether the time sequence variation of the post-arc current is consistent with the preset time sequence variation of the post-arc current, and determining a target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result.

[0069] It should be noted that the preset time sequence change of the post-arc current is set according to the time sequence change of the post-arc current in the type test results.

[0070] In the specific implementation, whether the high-voltage circuit breaker is successfully opened is determined according to the time-series change trend of the post-arc current. If the arc reignites, it means that the high-voltage circuit breaker has failed to open. If the arc does not reignite, it means that the high-voltage circuit breaker has successfully opened. If the simulation results are consistent with the type test results, it means that this high-voltage circuit breaker arc simulation method has high accuracy. If the simulation results are inconsistent with the type test results, it means that this high-voltage circuit breaker arc simulation method is not accurate or there are certain errors. It is necessary to make certain adjustments to the grid division, turbulence model, radiation model, boundary conditions, etc., and then re-execute the simulation process until the simulation results are consistent with the type test results.

[0071] Example 2

[0072] See also Figure 2 and Figure 3 , Figure 2 A flowchart of the steps of a high-voltage circuit breaker arc simulation method based on type test data provided in the second embodiment of the present invention.

[0073] The present invention provides a high-voltage circuit breaker arc simulation method based on type test data, comprising:

[0074] Step 201: Obtain critical breaking interval data of the high-voltage circuit breaker according to the type test results of the high-voltage circuit breaker.

[0075] Optionally, step 201 includes the following steps:

[0076] S11. Perform type tests on high-voltage circuit breakers at preset transient recovery voltages and power frequency recovery voltages;

[0077] S12. Determine whether the arc of the high-voltage circuit breaker reignites after it is disconnected based on the type test results;

[0078] S13. If the arc does not reignite, determine the critical breaking success point data;

[0079] S14. If the arc reignites, determine the critical breaking failure point data, adjust the rated short-circuit breaking current data, and jump to the step of performing a type test on the high-voltage circuit breaker under the preset transient recovery voltage and power frequency recovery voltage until the arc does not reignite, and then execute the next step;

[0080] S15. Generate critical breaking interval data of the high-voltage circuit breaker using the critical breaking success point data and the critical breaking failure point data.

[0081] It should be noted that if Figure 3 As shown, a type test is performed on the same high-voltage circuit breaker to obtain the breaking parameters and breaking critical point of the circuit breaker.

[0082] During implementation, samples of similar high-voltage circuit breakers are sampled for type testing. The performance and quality of the circuit breakers are studied and assessed, and the design is modified and reworked accordingly. The basic short-circuit test series includes T10, T30, T60, T100s, and T100a. Test method T10 consists of a rated operating sequence, breaking 10% of the rated short-circuit breaking current at the specified transient and power frequency recovery voltage, with a DC component less than 20%; test method T30 consists of a rated operating sequence, breaking 30% of the rated short-circuit breaking current at the specified transient and power frequency recovery voltage, with a DC component less than 20%; test method T60 consists of a rated operating sequence, breaking 60% of the rated short-circuit breaking current at the specified transient and power frequency recovery voltage, with a DC component less than 20%; test method T100s, the test parameters are: the specified 100% rated short-circuit breaking current, the specified transient and power frequency recovery voltage, the specified rated short-circuit making current and the specified applied voltage, the DC component of which should not exceed 20%; test method T100a, the test parameters are: 100% of the rated short-circuit breaking current, the DC component percentage equal to the specified appropriate rated value, and the specified transient and power frequency recovery voltage. The breaking capacity test of the high-voltage circuit breaker is carried out. If the arc does not reignite after the circuit breaker is broken, the breaking success point is obtained and the current data corresponding to the breaking success point is determined; if the arc reignites, the breaking fails. The experiment is carried out multiple times to obtain the critical breaking point and points near the critical breaking point.

[0083] Specifically, critical breaking success point data and critical breaking failure point data are used to generate critical breaking interval data of the high-voltage circuit breaker.

[0084] Optionally, the following steps S21-S22 are also included:

[0085] S21. Constructing control equations and a radiation model; wherein the control equations include mass conservation equations, momentum conservation equations, energy conservation equations, and electromagnetic field equations;

[0086] S22. Coupling the control equation, the radiation model and the preset turbulence model is used to generate an initial magnetohydrodynamic simulation model.

[0087] It should be noted that the MHD simulation model based on MHD theory simulates high-voltage circuit breakers using a set of mutually coupled nonlinear partial differential equations. The control equations involved in arcing simulation mainly include the following:

[0088] The governing equations include the mass conservation equation, momentum conservation equation, energy conservation equation and electromagnetic field equation;

[0089] The mass conservation equation is:

[0090]

[0091] Where t is time, unit is s; ρ is fluid density, unit is kg / m 3 ; is the velocity vector of the fluid motion, in m / s;

[0092] The momentum conservation equation is:

[0093]

[0094] Where p is the gas pressure, τ is the tensor, j is the current density vector, and B is the magnetic flux density;

[0095] The energy conservation equation is:

[0096]

[0097]

[0098] Where k is thermal conductivity, T is fluid temperature, E is energy, and P rad The intense radiation dissipation caused by the photothermal effect of the arc, σE 2 is the Joule heat input under the action of current, h is the enthalpy, Z j is the partition function of particle j, Y j is the mass fraction of particle j; ΔH fj is the reaction enthalpy change of particle j, m j is the mass of particle j, h j is the enthalpy of particle j, is the fluid velocity vector;

[0099] The electromagnetic field equation is:

[0100]

[0101] Where, is the magnetic flux density vector, is the current density vector, is the electric field strength vector, is the electric potential, σ is the electrical conductivity, μ0 is the relative magnetic permeability of vacuum; Ar and A z are the radial and axial components of the magnetic vector potential, and They are radial and axial unit vectors respectively, z represents axial, r represents radial, j r and j z are radial and axial current density vectors, respectively;

[0102] The radiation model is:

[0103] Qrad=4πε(rad,temp,press) (12)

[0104] Where ε(rad,temp,press) is the NEC coefficient;

[0105] The turbulence model selects the k-ε model, specifically:

[0106]

[0107] Where: G k , G b are the turbulent kinetic energy terms generated by velocity gradient and buoyancy respectively; Y M is the turbulent kinetic energy dissipation term generated by the expansion of compressible turbulent waves; S k 、S e All are user-defined source items; σ k , σ ε are the turbulent Prandtl numbers k and ε respectively; C1, C2, and C3 are all constants.

[0108] Turbulent viscosity u t The turbulent kinetic energy k and turbulent dissipation rate ε are calculated based on the turbulence equation:

[0109]

[0110] Where C μ is a constant. The Prandtl number characterizes the ratio of the kinematic viscosity coefficient to the thermal diffusivity, and can also be regarded as the ratio of the momentum transfer and heat transfer rates. Turbulent thermal conductivity k t and turbulent kinetic energy k and turbulent Prandtl number Pr t The following relationship exists:

[0111]

[0112] Where, Pr t The constants in the above equations and expressions are all set to default values.

[0113] During specific implementation, an initial magnetohydrodynamic simulation model is generated by coupling the mass conservation equation, momentum conservation equation, energy conservation equation, electromagnetic field equation, radiation model and preset turbulence model.

[0114] Step 202: Obtain the current value of the breaking success point and the current value of the breaking failure point of the critical breaking interval data.

[0115] It should be noted that if Figure 3 As shown, the current value of the successful breaking point and the current value of the failed breaking point of the critical breaking interval data are obtained, and the arcing process and post-arc simulation are performed on the current value of the successful breaking point and the current value of the failed breaking point respectively.

[0116] Step 203: Using the current value at the successful breaking point as a first boundary condition, an initial magnetohydrodynamic simulation model is used to perform arc simulation on the arcing process of the high-voltage circuit breaker to generate a first arc simulation result.

[0117] It should be noted that the first boundary condition refers to the boundary condition for simulating the arcing process of the high-voltage circuit breaker using the current value at the breaking success point or the breaking failure point.

[0118] The first arc simulation result refers to an arc simulation result of simulating the arcing process of the high-voltage circuit breaker with the current data of the successful breaking point as the boundary condition.

[0119] In specific implementation, the current value at the successful breaking point is used as the boundary condition, and the arcing process of the high-voltage circuit breaker is simulated by a magnetohydrodynamic simulation model based on magnetohydrodynamic theory to obtain a first arc simulation result.

[0120] Step 204 : Using the current value at the breaking failure point as the first boundary condition, an initial magnetohydrodynamic simulation model is used to perform arc simulation on the arcing process of the high-voltage circuit breaker to generate a second arc simulation result.

[0121] It should be noted that the second arc simulation result refers to an arc simulation result of performing arc simulation on the arcing process of the high-voltage circuit breaker with the current data of the breaking failure point as the boundary condition.

[0122] In a specific implementation, the current data of the breaking failure point is used as a boundary condition, and the arcing process of the high-voltage circuit breaker is simulated by a magnetohydrodynamic simulation model based on magnetohydrodynamic theory to obtain a second arc simulation result.

[0123] Step 205 : Based on the preset zero-zone arc model, the arc parameters of the arc simulation result are used as initial conditions to perform post-arc current calculation to determine the time sequence change of the post-arc current.

[0124] Optionally, step 205 includes the following steps S31-S37:

[0125] S31, extracting model parameters of a preset zero-zone arc model;

[0126] S32. Using arc parameters corresponding to the first arc simulation result as initial conditions, and calculating first temperature data and first pressure data under the action of a transient recovery voltage according to model parameters, a zero-zone arc model, and a preset transient recovery voltage;

[0127] S33, setting the conductivity as a function of temperature and pressure, and calculating a first resistivity value according to the first temperature data and the first pressure data;

[0128] S34. Determine a time sequence change of a first post-arc current under the action of the transient recovery voltage based on a voltage value corresponding to the transient recovery voltage and a first resistivity value;

[0129] S35. Using arc parameters corresponding to the second arc simulation result as initial conditions, and calculating second temperature data and second pressure data under the action of the transient recovery voltage according to the model parameters, the zero-zone arc model, and the transient recovery voltage;

[0130] S36, calculating a second resistivity value according to the second temperature data and the second pressure data;

[0131] S37. Determine a second post-arc current under the action of the transient recovery voltage based on the voltage value corresponding to the transient recovery voltage and the second resistivity value.

[0132] It should be noted that the second boundary condition refers to the transient recovery voltage as the boundary condition;

[0133] The first temperature data, the first pressure data, the first resistivity value, and the first post-arc current refer to the temperature data, the pressure data, the resistivity value, and the post-arc current calculated when the arc parameters corresponding to the first arc simulation result are used as boundary conditions;

[0134] The second temperature data, the second pressure data, the second resistivity value and the second post-arc current refer to the temperature data, the pressure data, the resistivity value and the post-arc current calculated with the arc parameters corresponding to the second arc simulation result as the boundary conditions.

[0135] In the specific implementation, the first arc simulation result is the result of simulating the arcing process of the high-voltage circuit breaker with the current data of the successful breaking point as the boundary condition, and the second arc simulation result is the result of simulating the arcing process of the high-voltage circuit breaker with the current data of the failed breaking point as the boundary condition. Therefore, the arc current and arc voltage obtained by these two arc simulation results are required as initial conditions to calculate the time series changes of the post-arc current of the high-voltage circuit breaker under the action of transient recovery voltage after the two arc simulation results.

[0136] Specifically, using the first or second arc simulation results as the initial condition and the preset transient recovery voltage as the boundary condition, the model parameters of the preset zero-zone arc model are extracted. The model parameters include arc parameters and circuit breaker parameters. Based on the zero-zone arc model and model parameters, the temperature and pressure distribution under the transient recovery voltage can be simulated and solved. The conductivity is a function of temperature and pressure, and the resistivity distribution of the solution domain under these conditions can be obtained. Given that the voltage is the preset transient recovery voltage and the resistance is the integral of the infinitesimal resistances of each control volume in the solution domain, the post-arc current under the transient recovery voltage can be obtained according to Ohm's law.

[0137] Step 206 : Compare the time sequence variation of the post-arc current to see whether it is consistent with the preset time sequence variation of the post-arc current, and determine the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result.

[0138] Optionally, step 206 includes the following steps S41-S44:

[0139] S41. Based on the type test results, determine the timing change of the preset post-arc current;

[0140] S42. When the time sequence change of the first post-arc current is that the arc does not restrike, and the time sequence change of the second post-arc current is that the arc restrike, it is determined that the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and the current magnetohydrodynamic simulation model is determined as the target magnetohydrodynamic simulation model of the high-voltage circuit breaker;

[0141] S43. When the time sequence change of the first post-arc current is that the arc reignites, and the time sequence change of the second post-arc current is that the arc does not reignite, determining that the time sequence change of the post-arc current is inconsistent with the preset time sequence change of the post-arc current, and optimizing the model parameters and the first boundary condition of the initial magnetohydrodynamic simulation model to generate an intermediate magnetohydrodynamic simulation model;

[0142] S44. Use the intermediate magnetohydrodynamic simulation model as a new initial magnetohydrodynamic simulation model, and jump to execute the step of using the preset initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker until the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current.

[0143] It should be noted that for the simulation results, if the arcing and post-arc simulation of the successful breaking point near the critical breaking point in the type test data shows that the arc does not reignite, the simulation results show that the circuit breaker successfully broke at this current; if the arcing and post-arc simulation of the failed breaking point near the critical breaking point in the type test data shows that the arc reignites, the simulation results show that the circuit breaker failed to break at this current. If the simulation results are consistent with the type test data, it means that this high-voltage circuit breaker arc simulation method or magnetohydrodynamic simulation model has high accuracy. If the simulation results are inconsistent with the type test data, it means that this high-voltage circuit breaker arc simulation method or magnetohydrodynamic simulation model is not accurate or contains certain errors.

[0144] If the simulation results conflict with the type test data, indicating that the high-voltage circuit breaker arc simulation method or magnetohydrodynamic (MHD) simulation model is inaccurate, adjustments / optimizations are required for factors such as meshing, turbulence models, radiation models, and boundary conditions. After these adjustments / optimizations, multiple successful and failed interruption points near the critical interruption points in the type test data are simulated, and the accuracy of the modified MHD simulation model is determined based on the simulation of small post-arc currents. Relying on type test data, a highly accurate high-voltage circuit breaker simulation method is found until the optimal arc simulation model is obtained, effectively achieving the arc simulation model for the high-voltage circuit breaker.

[0145] Specifically, mesh subdivision: refine the mesh in the key areas of the arc model, such as processing the irregular geometric areas to reduce the mesh distortion caused by the geometric figures; encrypt the mesh in the area where the arc exists in the arc extinguishing chamber, reduce the mesh size in the core area of ​​the arc, and improve the mesh quality in the core area.

[0146] Turbulence model: Adjust the turbulence model parameters, such as using different turbulence coefficients for small and large current conditions.

[0147] Radiation model: Different radiation models are used, such as the simplified T4 model. The method is simple but not very accurate, and does not take into account the problem of the arc's own absorption of radiant heat. This method can only ideally analyze the temperature distribution in the high-temperature area of ​​the arc center, but cannot well reflect the temperature conditions in the lower-temperature arc edge area; the net radiation coefficient method has high simulation accuracy but is complex to operate; the P1 approximation method estimates the incident radiation too low in the optically thin band, and the calculation accuracy is too low; the DOM method has high solution accuracy, but consumes huge computing resources and is not time-efficient.

[0148] Example 3

[0149] See also Figure 4 , Figure 4 This is a structural block diagram of a high-voltage circuit breaker arc simulation system based on type test data provided in Example 3 of the present invention.

[0150] The present invention provides a high-voltage circuit breaker arc simulation system based on type test data, comprising:

[0151] The test module 401 is used to obtain the critical breaking interval data of the high-voltage circuit breaker according to the type test results of the high-voltage circuit breaker;

[0152] The arc simulation module 402 is configured to use a current value corresponding to the critical breaking interval data as a first boundary condition and adopt a preset initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker;

[0153] A calculation module 403 is used to perform post-arc current calculation based on a preset zero-zone arc model and using arc parameters from arc simulation results as initial conditions to determine a time series change of the post-arc current;

[0154] The comparison module 404 is used to compare whether the time sequence variation of the post-arc current is consistent with the preset time sequence variation of the post-arc current, and determine the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result.

[0155] Optionally, the test module 401 includes:

[0156] Type test submodule, used to perform type test on high-voltage circuit breakers under preset transient recovery voltage and power frequency recovery voltage;

[0157] The test result submodule is used to determine whether the arc of the high-voltage circuit breaker reignites after it is disconnected based on the type test results;

[0158] The arc not reignited submodule is used to determine the critical breaking success point data if the arc does not reignite;

[0159] The arc restrike submodule is used to determine the critical breaking failure point data if the arc reignites, adjust the rated short-circuit breaking current data, jump to the step of performing type testing on the high-voltage circuit breaker under the preset transient recovery voltage and power frequency recovery voltage, until the arc does not reignite, and then execute the next step;

[0160] The critical breaking submodule is used to generate critical breaking interval data of the high-voltage circuit breaker using critical breaking success point data and critical breaking failure point data.

[0161] Optionally, it also includes:

[0162] The control equation submodule is used to construct the control equations and radiation model; the control equations include the mass conservation equation, momentum conservation equation, energy conservation equation and electromagnetic field equation;

[0163] The coupling submodule is used to couple the control equations, radiation model and preset turbulence model to generate an initial magnetohydrodynamic simulation model.

[0164] Optionally, the arc simulation module 402 includes:

[0165] The current value submodule is used to obtain the current value of the breaking success point and the current value of the breaking failure point of the critical breaking interval data;

[0166] A first arc simulation result submodule is configured to use the current value at the successful breaking point as a first boundary condition, adopt an initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker, and generate a first arc simulation result;

[0167] The second arc simulation result submodule is used to use the current value of the breaking failure point as the first boundary condition, adopt the initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker, and generate a second arc simulation result.

[0168] Optionally, the operation module 403 includes:

[0169] An extraction submodule, used for extracting model parameters of a preset zero zone arc model;

[0170] A first pressure data submodule is configured to calculate first temperature data and first pressure data under the action of a transient recovery voltage based on model parameters, a zero-zone arc model, and a preset transient recovery voltage, using arc parameters corresponding to the first arc simulation result as initial conditions;

[0171] a first resistivity value submodule, configured to set conductivity as a function of temperature and pressure, and calculate a first resistivity value based on first temperature data and first pressure data;

[0172] A first post-arc current submodule is configured to determine a time sequence change of a first post-arc current under the action of a transient recovery voltage based on a voltage value corresponding to the transient recovery voltage and a first resistivity value;

[0173] A second pressure data submodule is configured to calculate second temperature data and second pressure data under the action of a transient recovery voltage based on model parameters, a zero-zone arc model, and a transient recovery voltage, using arc parameters corresponding to the second arc simulation result as initial conditions;

[0174] A second resistivity value submodule, configured to calculate a second resistivity value based on the second temperature data and the second pressure data;

[0175] The second post-arc current submodule is used to determine the time sequence change of the second post-arc current under the action of the transient recovery voltage based on the voltage value corresponding to the transient recovery voltage and the second resistivity value.

[0176] Optionally, the determination module 404 includes:

[0177] The post-arc current time sequence change submodule is used to determine the preset time sequence change of the post-arc current based on the type test results;

[0178] The arc non-restirritation submodule is configured to determine, when the time sequence change of the first post-arc current is arc non-restirritation and the time sequence change of the second post-arc current is arc restirritation, whether the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and determine the current magnetohydrodynamic simulation model as the target magnetohydrodynamic simulation model of the high-voltage circuit breaker;

[0179] The arc restrike submodule is configured to determine, when the time sequence change of the first post-arc current is arc restrike and the time sequence change of the second post-arc current is arc non-restrike, that the time sequence change of the post-arc current is inconsistent with the preset time sequence change of the post-arc current, and optimize the model parameters and the first boundary condition of the initial magnetohydrodynamic simulation model to generate an intermediate magnetohydrodynamic simulation model;

[0180] The jump submodule is used to use the intermediate magnetohydrodynamic simulation model as a new initial magnetohydrodynamic simulation model, and jump to execute the step of using the preset initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker until the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current.

[0181] Example 4

[0182] See also Figure 5 , Figure 5 This is a structural block diagram of an electronic device provided in Example 4 of the present invention.

[0183] An electronic device according to an embodiment of the present invention includes: a memory 501 and a processor 502, wherein the memory 501 stores a computer program; when the computer program is executed by the processor 502, the processor 502 executes a high-voltage circuit breaker arc simulation method based on type test data as described in any of the above embodiments.

[0184] The memory 501 can be an electronic memory such as a flash memory, an EEPROM (Electrically Erasable Programmable Read-Only Memory), an EPROM, a hard disk, or a ROM. The memory 501 has a storage space 503 for program code 513 for executing any method step in the above method. For example, the storage space 503 for program code can include individual program codes 513 for implementing the various steps in the above method. These program codes can be read from or written to one or more computer program products. These computer program products include program code carriers such as a hard disk, a compact disk (CD), a memory card, or a floppy disk. The program code can be compressed, for example, in an appropriate form. When these codes are executed by a computing and processing device, the computing and processing device executes the various steps in the high-voltage circuit breaker arc simulation method based on type test data described above.

[0185] Example 5

[0186] A fifth embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, a high-voltage circuit breaker arc simulation method based on type test data according to any embodiment of the present invention is implemented.

[0187] Example 6

[0188] Embodiment 6 of the present invention provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes a high-voltage circuit breaker arc simulation method based on type test data as described in any embodiment of the present invention.

[0189] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0190] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0191] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0192] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0193] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0194] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage circuit breaker arc simulation method based on type test data, characterized in that: include: Obtaining critical breaking interval data of the high-voltage circuit breaker according to a type test result of the high-voltage circuit breaker; Using the current value corresponding to the critical breaking interval data as a first boundary condition, an arc simulation is performed on the arcing process of the high-voltage circuit breaker using a preset initial magnetohydrodynamic simulation model; Based on the preset zero-zone arc model, the arc parameters of the arc simulation results are used as initial conditions to perform post-arc current calculations and determine the time series changes of the post-arc current. Comparing whether the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and determining the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result; The step of obtaining the critical breaking interval data of the high-voltage circuit breaker according to the type test result of the high-voltage circuit breaker comprises: Conduct type tests on high-voltage circuit breakers at preset transient recovery voltage and power frequency recovery voltage; Determining whether the arc of the high-voltage circuit breaker reignites after being disconnected based on the type test results; If the arc does not reignite, the critical breaking success point data is determined; If the arc reignites, the critical breaking failure point data is determined, the rated short-circuit breaking current data is adjusted, and the step of performing a type test on the high-voltage circuit breaker under the preset transient recovery voltage and power frequency recovery voltage is skipped and executed until the arc does not reignite, and the next step is executed; The critical breaking success point data and the critical breaking failure point data are used to generate critical breaking interval data of the high-voltage circuit breaker.

2. The high-voltage circuit breaker arc simulation method based on type test data according to claim 1, characterized in that: Also includes: Constructing control equations and a radiation model; wherein the control equations include mass conservation equations, momentum conservation equations, energy conservation equations, and electromagnetic field equations; The control equation, the radiation model and a preset turbulence model are coupled to generate an initial magnetohydrodynamic simulation model.

3. The high-voltage circuit breaker arc simulation method based on type test data according to claim 2, characterized in that: The step of performing arc simulation on the arcing process of the high-voltage circuit breaker using a preset initial magnetohydrodynamic simulation model with the current value corresponding to the critical breaking interval data as a first boundary condition comprises: Obtaining the current value of the breaking success point and the current value of the breaking failure point of the critical breaking interval data; Taking the current value of the successful breaking point as a first boundary condition, using the initial magnetohydrodynamic simulation model to perform arc simulation on the arcing process of the high-voltage circuit breaker to generate a first arc simulation result; Taking the current value at the breaking failure point as the first boundary condition, the initial magnetohydrodynamic simulation model is used to perform arc simulation on the arcing process of the high-voltage circuit breaker to generate a second arc simulation result.

4. The high-voltage circuit breaker arc simulation method based on type test data according to claim 3, characterized in that: The step of performing post-arc current calculation based on a preset zero-zone arc model as an initial condition and determining the time sequence change of the post-arc current includes: Extracting model parameters of a preset zero-zone arc model; Using arc parameters corresponding to the first arc simulation result as initial conditions, and calculating first temperature data and first pressure data under the action of the transient recovery voltage according to the model parameters, the zero-zone arc model, and a preset transient recovery voltage; Setting conductivity as a function of temperature and pressure, and calculating a first resistivity value based on the first temperature data and the first pressure data; Determining a time sequence change of a first post-arc current under the action of the transient recovery voltage based on a voltage value corresponding to the transient recovery voltage and a first resistivity value; Using arc parameters corresponding to the second arc simulation result as initial conditions, and calculating second temperature data and second pressure data under the action of the transient recovery voltage according to the model parameters, the zero-zone arc model, and the transient recovery voltage; calculating a second resistivity value according to the second temperature data and the second pressure data; Based on the voltage value corresponding to the transient recovery voltage and the second resistivity value, a temporal change of the second post-arc current under the action of the transient recovery voltage is determined.

5. The high-voltage circuit breaker arc simulation method based on type test data according to claim 4, characterized in that: The step of comparing whether the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and determining the target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result includes: Based on the type test results, determining a time sequence change of a preset post-arc current; When the time sequence change of the first post-arc current is that the arc does not reignite, and the time sequence change of the second post-arc current is that the arc reignites, it is determined that the time sequence change of the post-arc current is consistent with the preset time sequence change of the post-arc current, and the current magnetohydrodynamic simulation model is determined as the target magnetohydrodynamic simulation model of the high-voltage circuit breaker; When the time sequence change of the first post-arc current is that the arc reignites, and the time sequence change of the second post-arc current is that the arc does not reignite, it is determined that the time sequence change of the post-arc current is inconsistent with the preset time sequence change of the post-arc current, and the model parameters and the first boundary conditions of the initial magnetohydrodynamic simulation model are optimized to generate an intermediate magnetohydrodynamic simulation model; The intermediate magnetohydrodynamic simulation model is used as a new initial magnetohydrodynamic simulation model, and the step of performing arc simulation on the arcing process of the high-voltage circuit breaker using the preset initial magnetohydrodynamic simulation model is jumped to execution until the time sequence change of the post-arc current is consistent with the time sequence change of the preset post-arc current.

6. A high-voltage circuit breaker arc simulation system based on type test data, characterized in that: include: A test module, configured to obtain critical breaking interval data of the high-voltage circuit breaker according to a type test result of the high-voltage circuit breaker; an arc simulation module, configured to perform arc simulation on the arcing process of the high-voltage circuit breaker using a preset initial magnetohydrodynamic simulation model, with the current value corresponding to the critical breaking interval data as a first boundary condition; A calculation module is used to perform post-arc current calculation based on a preset zero-zone arc model and arc parameters of arc simulation results as initial conditions to determine the time sequence change of the post-arc current; a comparison module, configured to compare whether the time sequence variation of the post-arc current is consistent with a preset time sequence variation of the post-arc current, and determine a target magnetohydrodynamic simulation model of the high-voltage circuit breaker according to the comparison result; The test module includes: Type test submodule, used to perform type test on high-voltage circuit breakers under preset transient recovery voltage and power frequency recovery voltage; A test result submodule, configured to determine whether the arc of the high-voltage circuit breaker reignites after being disconnected based on the type test result; The arc not reignited submodule is used to determine the critical breaking success point data if the arc does not reignite; an arc restrike submodule, configured to, if the arc restrikes, determine critical breaking failure point data, adjust rated short-circuit breaking current data, jump to executing the step of performing a type test on the high-voltage circuit breaker under a preset transient recovery voltage and power frequency recovery voltage until the arc does not restrike, and execute the next step; The critical breaking submodule is used to generate critical breaking interval data of the high-voltage circuit breaker by using the critical breaking success point data and the critical breaking failure point data.

7. An electronic device, characterized in that: The method comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the high-voltage circuit breaker arc simulation method based on type test data according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the high-voltage circuit breaker arc simulation method based on type test data as described in any one of claims 1 to 5 is implemented.

9. A computer program product, characterized in that The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer is caused to execute the high-voltage circuit breaker arc simulation method based on type test data according to any one of claims 1 to 5.

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