Method and device for generating current and voltage characteristics of transient arc

Abstract

The invention provides a current and voltage characteristic generation method and device of a transient arc, which can be used in the technical field of power system relay protection, and the method comprises the steps: constructing an arc model through employing an external electromotive force source, an internal resistor, and a plasma with a preset radius, length and transient temperature; generating an energy conservation model and a current model according to the arc model; converting the energy conservation model to obtain a direct current arc temperature model; and utilizing the direct current arc temperature model, the current model and a pre-generated conductivity regression model to generate current and voltage characteristics of the arc. According to the method and device for generating the current and voltage characteristics of the transient arc, the non-transient stable change process of the temperature and the voltage drop of the arc column is obtained, the change process of the arc column is described more accurately, and research on the grounding fault arc resistance of a power distribution network is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of relay protection for electric power systems, and in particular to a method and device for generating current and voltage characteristics of transient arcs. Background Art

[0002] Despite the high level of engineering and technology in the field of power system relay protection, modern protection devices, especially remote backup protection devices, may be insensitive to faults in the protected object due to a number of complex factors. One of these factors is the arc transient resistance at the fault location. Short-circuit arcs are more difficult to detect than metallic ground fault currents due to the reduced amplitude and phase change of arc fault currents.

[0003] Currently, in calculations to evaluate relay protection performance under arc fault modes, the arc column is usually represented as a permanent effective resistor that is switched to the fault location in the short-circuit path. This arc fault model is simple and easy to calculate, but it is not suitable for functional analysis of multi-parameter protection, which controls higher harmonic components, current and voltage shapes, light flux and other parameters. The arc resistance has obvious nonlinear and time-varying characteristics, and the arc column is a strong source of higher harmonics and distorts the voltage waveform.

[0004] In the prior art, the nonlinear arc fault column parameters are calculated based on empirical formulas. Although the prior art can improve the physical authenticity of the modeling process, it has the problem of low accuracy because it does not take into account the influencing factors such as the arc transient resistance. Summary of the invention

[0005] In view of the problems in the prior art, the embodiments of the present application provide a method and device for generating current and voltage characteristics of a transient arc, which can at least partially solve the problems in the prior art.

[0006] In a first aspect, the present application provides a method for generating current and voltage characteristics of a transient arc, comprising:

[0007] The arc model is constructed using an external electromotive force source, internal resistance, and plasma with a preset radius, length, and instantaneous temperature;

[0008] generating an energy conservation model and a current model according to the arc model;

[0009] Converting the energy conservation model to obtain a DC arc temperature model;

[0010] The DC arc temperature model, the current model and a pre-generated conductivity regression model are used to generate the current-voltage characteristics of the arc.

[0011] Further, generating an energy conservation model and a current model according to the arc model includes:

[0012] Obtaining electrical parameters and energy parameters according to the arc model;

[0013] generating the energy conservation model using the energy parameter;

[0014] The current model is generated using the electrical parameters.

[0015] Furthermore, the energy conservation model is converted to obtain a DC arc temperature model, including:

[0016] Converting the energy conservation model into a thermodynamic model based on Joule's law, Fourier's law, Newton-Richardson law and Stefan-Boltzmann law;

[0017] The DC arc temperature model is generated using the thermodynamic model.

[0018] Furthermore, the method of generating the current and voltage characteristics of the arc using the DC arc temperature model, the current model and the pre-generated conductivity regression model includes:

[0019] Solving the temperature distribution of the arc using the DC arc temperature model and the current model;

[0020] The current-voltage characteristics of the arc are generated according to the temperature distribution and the conductivity regression model.

[0021] Furthermore, the step of pre-generating the conductivity regression model includes:

[0022] Generate temperature data and conductivity data of simulated arc through finite element simulation;

[0023] A regression analysis is performed based on the temperature data and the conductivity data to obtain the conductivity regression model.

[0024] In a second aspect, the present application provides a device for generating current and voltage characteristics of a transient arc, comprising:

[0025] An arc model building unit, used for building an arc model using an external electromotive force source, an internal resistance, and a plasma with a preset radius, length, and instantaneous temperature;

[0026] A model generating unit, used for generating an energy conservation model and a current model according to the arc model;

[0027] A model conversion unit, used for converting the energy conservation model to obtain a DC arc temperature model;

[0028] The current-voltage characteristic generating unit is used to generate the current-voltage characteristic of the arc by using the DC arc temperature model, the current model and a pre-generated conductivity regression model.

[0029] Furthermore, the model generation unit includes:

[0030] A parameter acquisition module, used to obtain electrical parameters and energy parameters according to the arc model;

[0031] An energy conservation model generation module, used to generate the energy conservation model using the energy parameters;

[0032] A current model generating module is used to generate the current model using the electrical parameters.

[0033] Furthermore, the model conversion unit includes:

[0034] A thermodynamic model generation module, for converting the energy conservation model into a thermodynamic model based on Joule's law, Fourier's law, Newton-Richardson law and Stefan-Boltzmann law;

[0035] A temperature model generating module is used to generate the DC arc temperature model using the thermodynamic model.

[0036] Furthermore, the current-voltage characteristic generating unit includes:

[0037] A temperature distribution generating module, used for solving the temperature distribution of the arc by using the DC arc temperature model and the current model;

[0038] A current-voltage characteristic generating module is used to generate the current-voltage characteristics of the arc according to the temperature distribution and the conductivity regression model.

[0039] Furthermore, it also includes:

[0040] A finite element simulation unit, used for generating temperature data and conductivity data of a simulated arc through finite element simulation;

[0041] The conductivity regression model generating unit is used to perform regression analysis according to the temperature data and the conductivity data to obtain the conductivity regression model.

[0042] In a third aspect, the present application provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in any one of the above embodiments when executing the computer program.

[0043] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any of the above embodiments is implemented.

[0044] In a fifth aspect, the present application provides a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor, the method described in any of the above embodiments is implemented.

[0045] The method and device for generating the current and voltage characteristics of a transient arc provided in the present application construct an arc model by utilizing an external electromotive force source, an internal resistor, and a plasma with a preset radius, length, and instantaneous temperature; generating an energy conservation model and a current model based on the arc model; converting the energy conservation model to obtain a DC arc temperature model; and generating the current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model, thereby achieving a non-transient and stable change process of the temperature and voltage drop of the arc column, thereby more accurately characterizing the change process of the arc column, which is beneficial to the study of the arc resistance of grounding faults in distribution networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 It is a flow chart of a method for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application;

[0048] Figure 2 It is a flow chart of a method for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application;

[0049] Figure 3 It is a flow chart of a method for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application;

[0050] Figure 4 It is a flow chart of a method for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application;

[0051] Figure 5 It is a flow chart of a method for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application;

[0052] Figure 6 It is a structural schematic diagram of a device for generating current and voltage characteristics of a transient arc provided in one embodiment of the present application;

[0053] Figure 7 It is a structural schematic diagram of a device for generating current and voltage characteristics of a transient arc provided in one embodiment of the present application;

[0054] Figure 8 It is a structural schematic diagram of a device for generating current and voltage characteristics of a transient arc provided in one embodiment of the present application;

[0055] Fig. 9 It is a structural schematic diagram of a device for generating current and voltage characteristics of a transient arc provided in one embodiment of the present application;

[0056] Fig.10 It is a structural schematic diagram of a device for generating current and voltage characteristics of a transient arc provided in one embodiment of the present application;

[0057] Fig.11 is a schematic diagram of the physical structure of an electronic device provided in one embodiment of the present application;

[0058] Fig.12 is a schematic diagram of an arc model provided in an embodiment of the present application;

[0059] Fig.13 It is a schematic diagram of the current-voltage characteristics of an arc provided in an embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0061] The following uses a server as an example of an execution subject to illustrate the specific implementation process of the method for generating the current and voltage characteristics of a transient arc provided in an embodiment of the present application.

[0062] Figure 1 is a flow chart of a method for generating current and voltage characteristics of a transient arc provided by an embodiment of the present application, such as Figure 1 As shown, the method for generating the current and voltage characteristics of a transient arc provided by the present application includes:

[0063] S101: constructing an arc model using an external electromotive force source, an internal resistance, and a plasma with a preset radius, length, and instantaneous temperature;

[0064] S102: generating an energy conservation model and a current model according to the arc model;

[0065] S103: converting the energy conservation model to obtain a DC arc temperature model;

[0066] S104: Generate current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model.

[0067] from Figure 1 It can be seen from the process shown that the method for generating the current and voltage characteristics of a transient arc provided by the present application constructs an arc model by utilizing an external electromotive force source, an internal resistor, and a plasma with a preset radius, length, and instantaneous temperature; generates an energy conservation model and a current model based on the arc model; converts the energy conservation model to obtain a DC arc temperature model; and generates the current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model, thereby achieving a non-transient and stable change process of the temperature and voltage drop of the arc column, thereby more accurately characterizing the change process of the arc column, which is beneficial to the study of the arc resistance of grounding faults in distribution networks.

[0068] Each step is explained in detail below.

[0069] S101: constructing an arc model using an external electromotive force source, an internal resistance, and a plasma with a preset radius, length, and instantaneous temperature;

[0070] Specifically, assuming that the plasma cylinder has a radius r ARC , length l ARC and instantaneous temperature T ARC The plasma cylinder connects the damaged equipment part and is surrounded by atmospheric air. The server is based on the external electromotive force (EMF) source e and the internal resistance R EMF and plasma construction with preset radius, length and instantaneous temperature such as Fig.12 The arc model shown.

[0071] S102: generating an energy conservation model and a current model according to the arc model;

[0072] Specifically, the server obtains model parameters according to the constructed arc model, the model parameters including electrical parameters and energy parameters, and generates an energy conservation model and a current model according to the above model parameters.

[0073] Figure 2 is a flow chart of a method for generating current and voltage characteristics of a transient arc provided by an embodiment of the present application, such as Figure 2 As shown, S102 includes:

[0074] S201: Obtaining electrical parameters and energy parameters according to the arc model;

[0075] Specifically, the server obtains model parameters according to the constructed arc model, and the model parameters include electrical parameters and energy parameters. In the arc model, the external electromotive force (EMF) source e and the internal resistance REMF The resulting current i ARC Through the plasma cylinder flow, energy W EL Released in the plasma cylinder (arc column) to increase the energy W inside the plasma cylinder INT and through convection W CONV , heat conduction W COND and thermal radiation W RAD Discharged into the environment. Among them, the energy parameters include: energy W EL , the energy inside the plasma cylinder W INT , Convection W CONV , heat conduction W COND and thermal radiation W RAD The electrical parameters include the equivalent external electromotive force (external electromotive force source) e and the equivalent external internal resistance (internal resistance) R EMF 、Current i ARC and arc resistance R ARC .

[0076] S202: Generate the energy conservation model using the energy parameter;

[0077] Specifically, for the plasma cylinder of the arc model, the relationship between the arc current and the electromotive force EMF of the equivalent external energy source can be supplemented by the energy conservation model. The server generates the energy conservation model based on Ohm's law and Kirchhoff's law using energy parameters, including energy W EL , the energy inside the plasma cylinder W INT , Convection W CONV , heat conduction W COND and thermal radiation W RAD , the energy conservation model is as follows:

[0078] ΔW INT +A=W EL -W COND -W CONV -W RAD (1)

[0079] In the formula, ΔW INT represents the change in energy inside the plasma cylinder, W EL represents the energy released in the plasma cylinder, W CONV represents the energy discharged to the environment by convection, W COND Represents the energy discharged to the environment through heat conduction, W RAD It represents the energy discharged into the environment through thermal radiation, and A represents the work done by the plasma cylinder (arc column) against the external force.

[0080] S203: Generate the current model using the electrical parameters.

[0081] Specifically, the server generates a current model based on Ohm's law and Kirchhoff's law using electrical parameters, and supplements the relationship between the arc current and the electromotive force EMF of the equivalent external energy source through the current model, where the electrical parameters include the equivalent external electromotive force (external electromotive force source) e and the equivalent external internal resistance (internal resistance) R EMF 、Current i ARC and arc resistance R ARC The current model is as follows:

[0082]

[0083] In the formula, e is the equivalent external electromotive force, R ARC (T,p) is the arc resistance, R EMF is the equivalent external internal resistance, i ARC is the arc current, l ARC is the length of the plasma (arc), S ARC is the cross-sectional area of ​​the plasma (arc), σ(T, p) is the conductivity of the plasma, where T represents the temperature of the arc (plasma) and p represents the pressure.

[0084] The energy conservation model and current model completely describe the thermal and electrical processes in the arc model.

[0085] S103: converting the energy conservation model to obtain a DC arc temperature model;

[0086] Specifically, in order to solve the temperature distribution of the arc to generate the current-voltage characteristics, the server first converts the energy conservation model to generate a DC arc temperature model.

[0087] Figure 3 is a flow chart of a method for generating current and voltage characteristics of a transient arc provided by an embodiment of the present application, such as Figure 3 As shown, S103 includes:

[0088] S301: converting the energy conservation model into a thermodynamic model based on Joule's law, Fourier's law, Newton-Richardson law and Stefan-Boltzmann law;

[0089] Specifically, the server divides both sides of the energy conservation model by the basic time interval dt to obtain the following expression:

[0090]

[0091] In the formula, is the change in plasma internal energy per unit time, It is the work done by the arc column (plasma) against external forces per unit time, P elis the electrical energy released in the arc, P COND is the power transferred from the arc to the environment by conduction, P CONV is the power transferred from the arc to the environment by convection, P RAD is the power transferred from the arc to the environment by radiation.

[0092] The server further transforms equation (3), expressing the internal energy by heat energy, the work by volume change, the electric power by Joule's law, the heat conduction power by Fourier's law, the convection power by Newton-Richardson law, and the radiation power by Stefan-Boltzmann law, thereby obtaining a thermodynamic model. The thermodynamic model is expressed as follows:

[0093]

[0094] In the formula, T represents the temperature of the arc (plasma), T OUT represents the ambient temperature, p represents the pressure, t represents the time, r represents the radius of the arc (plasma), i ARC Represents the current passing through the arc, V ARC Indicates the voltage of the arc column, S ARC Represents the cross-sectional area of ​​the arc, l ARC Indicates the length of the arc, S COND represents the conduction heat transfer area, S CONV represents the convective heat transfer area, ρ(T, p) represents the density of plasma, C(T, p) represents the heat capacity of plasma, σ(T, p) represents the electrical conductivity of plasma, ε(T, p) represents the blackness of plasma, λ(T, p) represents the thermal conductivity of plasma, α(T, p) represents the convective heat transfer coefficient, and C0 represents the emissivity of black body.

[0095] S302: Generate the DC arc temperature model using the thermodynamic model.

[0096] Specifically, the server analyzes the DC arc plasma and generates a DC arc temperature model using a thermodynamic model as shown below:

[0097]

[0098] In the formula, u ARC represents the voltage drop of the arc, T represents the temperature of the arc (plasma), and T OUT represents the ambient temperature, p represents the pressure, t represents the time, r represents the radius of the arc (plasma), i ARC Represents the current passing through the arc, S COND represents the conduction heat transfer area, S CONVrepresents the convective heat transfer area, ε(T, p) represents the blackness of plasma, λ(T, p) represents the thermal conductivity of plasma, α(T, p) represents the convective heat transfer coefficient, and C0 represents the emissivity of the black body.

[0099] S104: Generate current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model.

[0100] Specifically, in order to obtain the current-voltage characteristics of the arc, the server pre-generates a conductivity regression model, and calculates the current-voltage characteristics of the arc using the conductivity regression model and a DC arc temperature model and a current model obtained according to the constructed arc model.

[0101] Figure 4 is a flow chart of a method for generating current and voltage characteristics of a transient arc provided by an embodiment of the present application, such as Figure 4 As shown, S104 includes:

[0102] S401: Calculating the temperature distribution of the arc using the DC arc temperature model and the current model;

[0103] Specifically, the operation of the DC arc temperature model and current model is based on the known relationship between electrical and thermodynamic plasma parameters and pressure and temperature. The server knows the current, voltage drop, arc column size, ambient temperature and thermodynamic plasma parameters, and solves the DC arc temperature model and current model to obtain the temperature distribution of the arc.

[0104] In one embodiment, the server uses an iterative calculation method to solve the DC arc temperature model and the current model, and solves the problem through repeated approximation.

[0105] In one embodiment, the iterative calculation steps include: selecting a suitable initial value according to the specific situation; defining an iterative formula and using the iterative formula to calculate the intermediate value; checking whether the intermediate value meets the convergence condition; if the convergence condition is not met, returning to continue iterating; if the condition is met, stopping the iteration to obtain the final value.

[0106] S402: Generate current and voltage characteristics of the arc according to the temperature distribution and the conductivity regression model.

[0107] Specifically, the server determines that the temperature is within a specified range, and calculates the current and voltage characteristics of AC arcs of different lengths and powers based on the temperature distribution and a pre-generated conductivity regression model.

[0108] The calculated current-voltage characteristics of the low-voltage AC arc confirm the accuracy of the temperature-calculated conductivity regression model of the plasma arc burning between carbon electrodes and the effectiveness of the arc model in calculating arc parameters.

[0109] In one embodiment, the arc burns between carbon electrodes in open air, the power supply voltage is 220V, the internal resistance is 13 ohms, the arc column length is 2cm, and the current and voltage characteristics of the arc calculated by the server are as follows: Fig.13 shown.

[0110] Figure 5 is a flow chart of a method for generating current and voltage characteristics of a transient arc provided by an embodiment of the present application, such as Figure 5 As shown, the steps for pre-generating a conductivity regression model include:

[0111] S501: Generate temperature data and conductivity data of a simulated arc through finite element simulation;

[0112] Specifically, the use of arc models for relay protection by servers requires additional study of the plasma parameters of the arc occurring at the fault location. The arc plasma consists of strongly ionized ambient molecules and electrode vapor, between which the arc burns. Due to its low concentration, the electrode vapor has little effect on the thermodynamic properties of the arc plasma and can be specified to the same parameters of the ambient plasma at the same temperature and pressure, but the electrode vapor significantly affects its electrical plasma parameters, especially the specific conductivity.

[0113] The server uses the finite element physical model to create a simulated DC arc and measure its parameters, and obtains temperature data and conductivity data through calculation.

[0114] In one embodiment, the temperature data and the conductivity data include temperatures and related conductivity values ​​of arc plasma combustion between a plurality of open-air carbon electrodes.

[0115] S502: Perform regression analysis based on the temperature data and the conductivity data to obtain the conductivity regression model.

[0116] Specifically, the server performs data preprocessing and linear regression analysis on the temperature data and the conductivity data, and obtains a conductivity regression model by fitting. The conductivity regression model reflects the electrical characteristics of the low-current arc plasma burning between the carbon electrodes.

[0117] In one embodiment, data preprocessing of the temperature data and the conductivity data includes: processing missing values ​​and outliers, data standardization or normalization, variable conversion, and principal component analysis.

[0118] In one embodiment, the conductivity regression model obtained by fitting can be expressed as:

[0119] σ ARC =a+bT+cT 2 (6)

[0120] In the formula, σARC represents the conductivity of the arc, T represents the temperature of the arc, and a, b and c represent the parameters obtained by fitting.

[0121] The present application provides a method for generating current and voltage characteristics of a transient electric arc, by constructing an arc model using an external electromotive force source, an internal resistor, and a plasma with a preset radius, length, and instantaneous temperature; generating an energy conservation model and a current model based on the arc model; converting the energy conservation model to obtain a DC arc temperature model; and generating the current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model, thereby achieving a non-transient and stable change process of the temperature and voltage drop of the arc column, thereby more accurately characterizing the change process of the arc column, which is beneficial to the study of the arc resistance of grounding faults in distribution networks.

[0122] Based on the same inventive concept, the embodiments of the present application also provide a device for generating current and voltage characteristics of a transient arc, which can be used to implement the method described in the above embodiments, as described in the following embodiments. Since the principle of solving the problem by the device for generating current and voltage characteristics of a transient arc is similar to that of the method for generating current and voltage characteristics of a transient arc, the implementation of the device for generating current and voltage characteristics of a transient arc can refer to the implementation of the method for determining the software performance benchmark, and the repeated parts will not be repeated. As used below, the terms "unit" or "module" can be a combination of software and / or hardware that implements predetermined functions. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0123] Figure 6 is a schematic diagram of the structure of a device for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application, such as Figure 6 As shown, the device comprises:

[0124] The arc model building unit 601 is used to build an arc model using an external electromotive force source, an internal resistance, and a plasma with a preset radius, length, and instantaneous temperature;

[0125] Specifically, assuming that the plasma cylinder has a radius r ARC , length l ARC and instantaneous temperature T ARC The plasma cylinder connects the damaged equipment part and is surrounded by atmospheric air. The arc model building unit 601 builds the arc model according to the external electromotive force (EMF) source e, the internal resistance R EMF and plasma construction with preset radius, length and instantaneous temperature such as Fig.12 The arc model shown.

[0126] A model generating unit 602, configured to generate an energy conservation model and a current model according to the arc model;

[0127] Specifically, the model generation unit 602 obtains model parameters according to the constructed arc model, and the model parameters include electrical parameters and energy parameters. The model generation unit 602 generates an energy conservation model and a current model according to the above model parameters.

[0128] A model conversion unit 603, used to convert the energy conservation model to obtain a DC arc temperature model;

[0129] Specifically, in order to solve the temperature distribution of the arc to generate the current-voltage characteristics, the model conversion unit 603 first converts the energy conservation model to generate a DC arc temperature model.

[0130] The current-voltage characteristic generating unit 604 is used to generate the current-voltage characteristic of the arc by using the DC arc temperature model, the current model and the pre-generated conductivity regression model.

[0131] Specifically, in order to obtain the current and voltage characteristics of the arc, the server pre-generates a conductivity regression model, and the current and voltage characteristics generation unit 604 calculates the current and voltage characteristics of the arc using the conductivity regression model and the DC arc temperature model and current model obtained according to the constructed arc model.

[0132] Figure 7 Schematic diagram of the structure of a device for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application. Figure 6 Based on the embodiment, further, Figure 7 As shown, the current and voltage characteristics generating device of the transient arc provided by the present application also includes:

[0133] A parameter acquisition module 701, used to obtain electrical parameters and energy parameters according to the arc model;

[0134] An energy conservation model generating module 702, used to generate the energy conservation model using the energy parameters;

[0135] The current model generating module 703 is used to generate the current model using the electrical parameters.

[0136] Figure 8 Schematic diagram of the structure of a device for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application. Figure 6 Based on the embodiment, further, Figure 8 As shown, the current and voltage characteristics generating device of the transient arc provided by the present application also includes:

[0137] Thermodynamic model generation module 801, used for converting the energy conservation model into a thermodynamic model based on Joule's law, Fourier's law, Newton-Richardson law and Stefan-Boltzmann law;

[0138] The temperature model generating module 802 is used to generate the DC arc temperature model using the thermodynamic model.

[0139] Fig. 9 Schematic diagram of the structure of a device for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application. Figure 6 Based on the embodiment, further, Fig. 9 As shown, the current and voltage characteristics generating device of the transient arc provided by the present application also includes:

[0140] A temperature distribution generating module 901 is used to solve the temperature distribution of the arc by using the DC arc temperature model and the current model;

[0141] The current-voltage characteristic generating module 902 is used to generate the current-voltage characteristic of the arc according to the temperature distribution and the conductivity regression model.

[0142] Fig.10 Schematic diagram of the structure of a device for generating current and voltage characteristics of a transient arc provided in an embodiment of the present application. Figure 6 Based on the embodiment, further, Fig.10 As shown, the current and voltage characteristics generating device of the transient arc provided by the present application also includes:

[0143] The finite element simulation unit 1001 is used to generate temperature data and conductivity data of the simulated arc through finite element simulation;

[0144] The conductivity regression model generating unit 1002 is used to perform regression analysis according to the temperature data and the conductivity data to obtain the conductivity regression model.

[0145] The present application provides a method and device for generating current and voltage characteristics of a transient electric arc, which constructs an arc model by utilizing an external electromotive force source, an internal resistor, and a plasma with a preset radius, length, and instantaneous temperature; generates an energy conservation model and a current model based on the arc model; converts the energy conservation model to obtain a DC arc temperature model; and generates the current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model, thereby achieving a non-transient and stable change process of the temperature and voltage drop of the arc column, thereby more accurately characterizing the change process of the arc column, which is beneficial to the study of the arc resistance of grounding faults in distribution networks.

[0146] Fig.11is a schematic diagram of the physical structure of an electronic device provided in an embodiment of the present application, such as Fig.11 As shown, the electronic device may include: a processor 1101, a communication interface 1102, a memory 1103 and a communication bus 1104, wherein the processor 1101, the communication interface 1102 and the memory 1103 communicate with each other through the communication bus 1104. The processor 1101 may call the logic instructions in the memory 1103 to execute the following method: construct an arc model using an external electromotive force source, an internal resistor and a plasma with a preset radius, length and instantaneous temperature; generate an energy conservation model and a current model according to the arc model; convert the energy conservation model to obtain a DC arc temperature model; generate the current and voltage characteristics of the arc using the DC arc temperature model, the current model and a pre-generated conductivity regression model.

[0147] In addition, the logic instructions in the above-mentioned memory 1103 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. 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 disk or an optical disk.

[0148] The present embodiment discloses a computer program product, which includes a computer program stored on a computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments, for example, including: constructing an arc model using an external electromotive force source, an internal resistor, and a plasma with a preset radius, length, and instantaneous temperature; generating an energy conservation model and a current model based on the arc model; converting the energy conservation model to obtain a DC arc temperature model; and generating the current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model.

[0149] The present embodiment provides a computer-readable storage medium, which stores a computer program, and the computer program enables the computer to execute the methods provided by the above-mentioned method embodiments, for example, including: constructing an arc model using an external electromotive force source, internal resistance, and a plasma with a preset radius, length, and instantaneous temperature; generating an energy conservation model and a current model based on the arc model; converting the energy conservation model to obtain a DC arc temperature model; and generating the current and voltage characteristics of the arc using the DC arc temperature model, the current model, and a pre-generated conductivity regression model.

[0150] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0151] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0152] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0153] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0154] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0155] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for generating current and voltage characteristics of a transient arc, characterized in that: include: The arc model is constructed using an external electromotive force source, internal resistance, and plasma with a preset radius, length, and instantaneous temperature; generating an energy conservation model and a current model according to the arc model; Converting the energy conservation model to obtain a DC arc temperature model; The DC arc temperature model, the current model and a pre-generated conductivity regression model are used to generate the current-voltage characteristics of the arc.

2. The method for generating the current-voltage characteristics of a transient arc according to claim 1, characterized in that: The generating of the energy conservation model and the current model according to the arc model comprises: Obtaining electrical parameters and energy parameters according to the arc model; generating the energy conservation model using the energy parameter; The current model is generated using the electrical parameters.

3. The method for generating the current and voltage characteristics of a transient arc according to claim 1, characterized in that: The energy conservation model is converted to obtain a DC arc temperature model, including: Converting the energy conservation model into a thermodynamic model based on Joule's law, Fourier's law, Newton-Richardson law and Stefan-Boltzmann law; The DC arc temperature model is generated using the thermodynamic model.

4. The method for generating the current and voltage characteristics of a transient arc according to claim 1, characterized in that: The method of generating the current and voltage characteristics of the arc by using the DC arc temperature model, the current model and the pre-generated conductivity regression model includes: Solving the temperature distribution of the arc using the DC arc temperature model and the current model; The current-voltage characteristics of the arc are generated according to the temperature distribution and the conductivity regression model.

5. The method for generating current and voltage characteristics of transient arc according to claim 1, characterized in that: The steps to pre-generate a conductivity regression model include: Generate temperature data and conductivity data of simulated arc through finite element simulation; A regression analysis is performed based on the temperature data and the conductivity data to obtain the conductivity regression model.

6. A device for generating current and voltage characteristics of transient arc, characterized in that: include: An arc model building unit, used for building an arc model using an external electromotive force source, an internal resistance, and a plasma with a preset radius, length, and instantaneous temperature; A model generating unit, used for generating an energy conservation model and a current model according to the arc model; A model conversion unit, used for converting the energy conservation model to obtain a DC arc temperature model; The current-voltage characteristic generating unit is used to generate the current-voltage characteristic of the arc by using the DC arc temperature model, the current model and a pre-generated conductivity regression model.

7. The device for generating current and voltage characteristics of transient arc according to claim 6, characterized in that: The model generation unit comprises: A parameter acquisition module, used to obtain electrical parameters and energy parameters according to the arc model; An energy conservation model generation module, used to generate the energy conservation model using the energy parameters; A current model generating module is used to generate the current model using the electrical parameters.

8. The device for generating current and voltage characteristics of transient arc according to claim 6, characterized in that: The model conversion unit comprises: A thermodynamic model generation module, for converting the energy conservation model into a thermodynamic model based on Joule's law, Fourier's law, Newton-Richardson law and Stefan-Boltzmann law; A temperature model generating module is used to generate the DC arc temperature model using the thermodynamic model.

9. The device for generating current and voltage characteristics of transient arc according to claim 6, characterized in that: The current-voltage characteristic generating unit comprises: A temperature distribution generating module, used for solving the temperature distribution of the arc by using the DC arc temperature model and the current model; A current-voltage characteristic generating module is used to generate the current-voltage characteristics of the arc according to the temperature distribution and the conductivity regression model.

10. The device for generating current and voltage characteristics of transient arc according to claim 6, characterized in that: Also includes: A finite element simulation unit, used for generating temperature data and conductivity data of a simulated arc through finite element simulation; The conductivity regression model generating unit is used to perform regression analysis according to the temperature data and the conductivity data to obtain the conductivity regression model.

11. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 5 is implemented.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

13. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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