Method and device for evaluating breaking capacity of high-pressure gas circuit breaker, terminal equipment and storage medium

Abstract

The invention discloses a breaking capacity evaluation method and device of a high-pressure gas circuit breaker, terminal equipment and a storage medium, and the method comprises the steps: building an initial black box model of the high-pressure gas circuit breaker according to structure parameters and design parameters, and obtaining a first black box model of the high-pressure gas circuit breaker based on a first experiment result of the high-pressure gas circuit breaker in a symmetric short-circuit current breaking test; and optimizing model parameters in the initial black box model, generating a black box model, overcoming the defect of inaccurate evaluation result caused by insufficient parameter precision at present, then performing asymmetric short-circuit current on-off tests of different test conditions on the black box model by adopting a simulation loop, and according to a second test result, calculating the evaluation result of the black box model. And the breaking performance of the high-pressure gas circuit breaker is determined, so that the defects of high economic and time cost of the current test evaluation method are overcome. Therefore, the test evaluation method and the simulation method in the circuit breaker breaking capacity performance evaluation method are combined, the reliability of the evaluation result is effectively improved, and meanwhile test resources and time cost are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a method, a device, a terminal device and a storage medium for evaluating the breaking capacity of a high-voltage gas circuit breaker. Background Art

[0002] With the continuous increase of voltage level, the increase of power grid equipment and the increase of network complexity, if a fault cannot be removed in time, it will cause serious damage to the power supply reliability and economic benefits of the power system. High-voltage circuit breakers are important protection and control equipment in the power system, and play a vital role in the reliability and stability of my country's power system. Most of the existing circuit breakers in the power grid are tested and assessed under the short-circuit current with a time constant of 45ms or 75ms. At present, the domestic 220kV and 550kV power grids have the problem of excessive attenuation time constant of the DC component of short-circuit current. It is a relatively economical and convenient way to upgrade and transform the existing circuit breakers in the network to adapt to the new operating environment. If all the modified circuit breakers are re-tested, the cost will be greatly increased. Therefore, a relatively economical and reliable evaluation method is used to verify the effectiveness of the circuit breaker asymmetric short-circuit current breaking capacity improvement and transformation technology, which is of great significance to the risk control of excessive DC component of short-circuit current.

[0003] The current methods for evaluating the breaking capacity of circuit breakers include test evaluation, empirical formulas, simulation methods, etc. The test evaluation method will incur a large economic and time cost; if the empirical formula or simulation method is used, the accuracy and reliability of the evaluation results may be insufficient due to insufficient parameter precision. Summary of the invention

[0004] The embodiments of the present invention provide a method, device, terminal equipment and storage medium for evaluating the breaking capacity of a high-voltage gas circuit breaker. By combining the experimental evaluation method with the simulation method in the circuit breaker breaking capacity performance evaluation method, the reliability of the evaluation result is effectively improved while also saving experimental resources and time costs.

[0005] An embodiment of the present invention provides a method for evaluating the breaking capacity of a high-voltage gas circuit breaker, comprising:

[0006] Acquire structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0007] Constructing an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and the design parameters;

[0008] According to the first experimental result, optimizing the model parameters in the initial black box model to generate a black box model;

[0009] Applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result;

[0010] According to the second experimental result, the breaking performance of the high-voltage gas circuit breaker is determined.

[0011] Furthermore, constructing an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and the design parameters includes:

[0012] According to the structural parameters and the design parameters, several relational function formulas are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational function formulas include: a first relational function formula for characterizing the association between the contact and the nozzle of the high-voltage gas circuit breaker during the opening process, a second relational function formula for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational function formula for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0013] The initial black box model is constructed according to the plurality of relational functional expressions.

[0014] Further, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a number of symmetrical short-circuit current breaking tests;

[0015] The step of optimizing the model parameters in the initial black box model according to the first experimental result to generate a black box model includes:

[0016] Obtaining the first arc current in a number of symmetrical short-circuit current breaking tests;

[0017] Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0018] The optimization operation includes:

[0019] Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0020] Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated;

[0021] Comparing the arc voltages to be evaluated with the corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0022] When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0023] When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

[0024] Further, the second experimental result includes: in each of the asymmetric short-circuit current breaking tests, the second arc voltage and the loop current measured when the high-voltage gas circuit breaker is broken;

[0025] Determining the breaking performance of the high-voltage gas circuit breaker according to the second experimental result includes:

[0026] Obtaining an expected zero point of each of the asymmetric short-circuit current breaking tests;

[0027] After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is not lower than a preset breaking arc extinction peak threshold, it is determined that the high-voltage gas circuit breaker has breaking performance under corresponding test conditions;

[0028] After determining the expected zero point, when the loop current is not zero, or an electrical breakdown phenomenon occurs, or a thermal breakdown phenomenon occurs, determining that the high-voltage gas circuit breaker does not have a breaking performance under corresponding test conditions;

[0029] Furthermore, after obtaining the expected zero point of each asymmetric short-circuit current breaking test, the method further includes:

[0030] After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is lower than the preset arc extinction peak threshold, it is determined that the breaking capacity of the high-voltage gas circuit breaker under the corresponding test conditions cannot be evaluated.

[0031] Another embodiment of the present invention provides a breaking capacity evaluation device for a high-voltage gas circuit breaker, comprising:

[0032] A parameter acquisition module, used to acquire structural parameters and design parameters of the high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0033] A model building module, used to build an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters;

[0034] A model optimization module, used to optimize the model parameters in the initial black box model according to the first experimental result to generate a black box model;

[0035] A simulation test module, used for applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result;

[0036] A performance evaluation module is used to determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

[0037] Furthermore, the model building module builds an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and the design parameters, including:

[0038] According to the structural parameters and the design parameters, several relational function formulas are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational function formulas include: a first relational function formula for characterizing the association between the contact and the nozzle of the high-voltage gas circuit breaker during the opening process, a second relational function formula for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational function formula for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0039] The initial black box model is constructed according to the plurality of relational functional expressions.

[0040] Further, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a number of symmetrical short-circuit current breaking tests;

[0041] The model optimization module optimizes the model parameters in the initial black box model according to the first experimental result to generate a black box model, including:

[0042] Obtaining the first arc current in a number of symmetrical short-circuit current breaking tests;

[0043] Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0044] The optimization operation includes:

[0045] Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0046] Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated;

[0047] Comparing the arc voltages to be evaluated with the corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0048] When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0049] When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

[0050] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, a method for evaluating the breaking capacity of a high-voltage gas circuit breaker as described in any one of the embodiments is implemented.

[0051] Another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a method for evaluating the breaking capacity of a high-voltage gas circuit breaker as described in any one of the above embodiments.

[0052] The following beneficial effects are achieved by implementing the present invention:

[0053] The present invention discloses a method, device, terminal equipment and storage medium for evaluating the breaking capacity of a high-voltage gas circuit breaker. The method first constructs an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters of the high-voltage gas circuit breaker to be evaluated, and then optimizes the model parameters in the initial black box model based on the first experimental result of the high-voltage gas circuit breaker in the symmetrical short-circuit current breaking test, and generates a black box model, thereby overcoming the defect of inaccurate evaluation results due to insufficient parameter accuracy. Then, a preset simulation loop is used to perform an asymmetrical short-circuit current breaking test under different test conditions on the black box model, and the breaking performance of the high-voltage gas circuit breaker is determined according to the second experimental result, thereby overcoming the defect of high economic and time costs of the current test evaluation method. Therefore, the present invention combines the test evaluation method with the simulation method in the circuit breaker breaking capacity performance evaluation method, effectively improving the reliability of the evaluation results while also saving test resources and time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a flow chart of a method for evaluating the breaking capacity of a high-voltage gas circuit breaker provided in one embodiment of the present invention.

[0055] Figure 2 It is a structural schematic diagram of a breaking capacity evaluation device for a high-voltage gas circuit breaker provided by an embodiment of the present invention.

[0056] Figure 3 It is a structural diagram of a simulation loop provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0064] See also Figure 1 , is a flow chart of a method for evaluating the breaking capacity of a high-voltage gas circuit breaker provided by an embodiment of the present invention, comprising:

[0065] S1. Obtaining structural parameters, design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0066] In a preferred embodiment of the present invention, the structural parameters and design parameters include the contact opening distance of the high-voltage gas circuit breaker, the matching relationship between the contact and the nozzle, the opening speed, etc. A symmetrical short-circuit current breaking test is performed on the high-voltage gas circuit breaker, and the arc voltage and zero-zone current at both ends of the high-voltage gas circuit breaker are synchronously measured during the test.

[0067] S2. constructing an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters;

[0068] Preferably, constructing the initial black box model of the high-voltage gas circuit breaker according to the structural parameters and the design parameters includes:

[0069] S21. Generate several relational function formulas for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process according to the structural parameters and the design parameters; wherein the relational function formulas include: a first relational function formula for characterizing the association between the contact and the nozzle of the high-voltage gas circuit breaker during the opening process, a second relational function formula for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational function formula for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0070] S22. Construct the initial black box model according to the plurality of relational functional expressions.

[0071] In a preferred embodiment of the present invention, a functional relationship between the circuit breaker opening process and the design parameters is established, including but not limited to the coordination relationship between the contact movement and the nozzle, the relationship between the nozzle cross-sectional area and the current size, the arcing time, etc. According to the established functional relationship, the functional form of the initial black box model suitable for the high-voltage gas circuit breaker is obtained:

[0072]

[0073] Where: T1, T2, T3 are time constants; P1, P2, P3 are arc dissipation powers. For a given circuit breaker T1, T2, T3, the following relationship exists:

[0074]

[0075] It should be noted that the ratio k is related to the design parameters of the actual high-voltage gas circuit breaker and can reflect the actual state of the arc extinguishing chamber. It has been applied to circuit breakers with a wide range of ratings and different designs.

[0076] S3. According to the first experimental result, optimizing the model parameters in the initial black box model to generate a black box model;

[0077] Preferably, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a number of symmetrical short-circuit current breaking tests;

[0078] S31, optimizing the model parameters in the initial black box model according to the first experimental result to generate a black box model, including:

[0079] S32, obtaining the first arc current in several symmetrical short-circuit current breaking tests;

[0080] S33, repeatedly optimizing the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0081] The optimization operation includes:

[0082] S331, obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0083] S332, inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated;

[0084] S333, comparing the arc voltages to be evaluated with the corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0085] S334: when the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0086] S335: When the fitness is less than a preset fitness threshold, use the black box model to be optimized as the black box model.

[0087] In a preferred embodiment of the present invention, a symmetrical short-circuit current breaking test is performed on a high-voltage gas circuit breaker, the arc voltage and the zero-zone current at both ends of the circuit breaker are synchronously measured, and the parameters of the arc black box model are extracted and fitted, so that in the symmetrical short-circuit current breaking test simulation loop under the same test conditions as step S1, the current and arc voltage waveforms calculated after substituting the arc black box model are consistent with the arc voltage waveform measured in the experiment. At this time, the arc black box model is an arc black box model after parameter adjustment.

[0088] The arc voltage and zero-zone current in the first experimental data are extracted, and the steps of unified order of magnitude conversion of the measured data, current zero point calibration and correction, loop bus voltage drop removal, and waveform capture required for fitting are completed in sequence through data processing software such as Matlab or Python.

[0089] Taking the arc current as a known quantity, substitute it into the arc black box model differential equation of the parameters to be fitted, and solve the differential equation. Taking the arc voltage as the target quantity, calculate the arc voltage obtained by fitting through the solved differential equation and compare it with the arc voltage measurement value corresponding to the moment, and use the least squares method to construct the following fitness function of the arc voltage Uarc:

[0090]

[0091] Genetic algorithm, particle swarm algorithm and other algorithms are used to select the parameter value with the minimum fitness, which is the arc black box model parameter corresponding to the circuit breaker.

[0092] S4, applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result;

[0093] In a preferred embodiment of the present invention, simulation conditions of asymmetric breaking test current and voltage stress under different time constants are established, and the following structure is constructed: Figure 3 The corresponding simulation circuit shown in the figure simulates the asymmetric short-circuit current breaking test conditions, substitutes the adjusted arc black box model, uses it to replace the circuit breaker for simulation test, controls the circuit breaker to operate at the expected time, and calculates the corresponding zero zone current and arc voltage. Figure 3Among them, Ucs current loop voltage, L1 current loop equivalent inductance, AP arc extension loop, St tested circuit breaker (black box model arc mode l replacement), Cdh voltage loop time delay capacitance, Zh voltage loop equivalent wave impedance, Lh voltage loop inductance, Uh voltage loop charging voltage, Sa auxiliary switch.

[0094] S5. Determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

[0095] Preferably, the second experimental result includes: in each of the asymmetric short-circuit current breaking tests, the second arc voltage and the loop current measured when the high-voltage gas circuit breaker is broken;

[0096] Determining the breaking performance of the high-voltage gas circuit breaker according to the second experimental result includes:

[0097] S51, obtaining the expected zero point of each asymmetric short-circuit current breaking test;

[0098] S52, after determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is not lower than a preset breaking arc extinction peak threshold, determining that the high-voltage gas circuit breaker has breaking performance under corresponding test conditions;

[0099] S53, after determining the expected zero point, when the loop current is not zero, or an electrical breakdown phenomenon occurs, or a thermal breakdown phenomenon occurs, determining that the high-voltage gas circuit breaker does not have a breaking performance under corresponding test conditions;

[0100] Preferably, after obtaining the expected zero point of each asymmetric short-circuit current breaking test, the method further includes:

[0101] S54. After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is lower than the preset arc extinction peak threshold, it is determined that the breaking capacity of the high-voltage gas circuit breaker under the corresponding test conditions cannot be evaluated.

[0102] In a preferred embodiment of the present invention, the calculated arc voltage and current are analyzed to evaluate the breaking performance of the modified circuit breaker.

[0103] If the simulation results show that the zero zone current can be broken at the expected current zero point, the current remains zero after the expected zero point, and the arc extinction peak of the arc voltage is not lower than the minimum breaking arc extinction peak value (empirical value), then the circuit breaker is considered to have the asymmetric short-circuit current breaking capacity under this condition.

[0104] If the current is not zero after the expected current zero point, or electrical breakdown or thermal breakdown occurs after zero, it is considered that the circuit breaker does not have the asymmetric short-circuit current breaking capacity under this condition.

[0105] If the current is zero after the expected current zero point, but the peak value of the arc extinction spike is lower than the minimum arc extinction spike for breaking, it is considered that the circuit breaker is in the critical breaking interval at this time, and the breaking capacity under this condition can be further evaluated through tests or other evaluation methods.

[0106] This embodiment provides a method for evaluating the breaking capacity of a high-voltage gas circuit breaker, by constructing an initial black box model of the high-voltage gas circuit breaker according to structural parameters and design parameters, and then optimizing the model parameters in the initial black box model based on the first experimental result of the high-voltage gas circuit breaker in the symmetrical short-circuit current breaking test, generating a black box model, overcoming the current defect of inaccurate evaluation results due to insufficient parameter accuracy, and then using a simulation loop to perform an asymmetrical short-circuit current breaking test on the black box model under different test conditions, and determining the breaking performance of the high-voltage gas circuit breaker according to the second experimental result, overcoming the current defect of high economic and time costs of the test evaluation method. Therefore, this embodiment combines the test evaluation method and the simulation method in the circuit breaker breaking capacity performance evaluation method, effectively improving the reliability of the evaluation results while also saving test resources and time costs.

[0107] See also Figure 2 , is a schematic structural diagram of a breaking capacity evaluation device for a high-voltage gas circuit breaker provided by an embodiment of the present invention, comprising:

[0108] A parameter acquisition module, used to acquire structural parameters and design parameters of the high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test;

[0109] A model building module, used to build an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters;

[0110] A model optimization module, used to optimize the model parameters in the initial black box model according to the first experimental result to generate a black box model;

[0111] A simulation test module, used for applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result;

[0112] A performance evaluation module is used to determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

[0113] Furthermore, the model building module builds an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and the design parameters, including:

[0114] According to the structural parameters and the design parameters, several relational function formulas are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational function formulas include: a first relational function formula for characterizing the association between the contact and the nozzle of the high-voltage gas circuit breaker during the opening process, a second relational function formula for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational function formula for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process;

[0115] The initial black box model is constructed according to the plurality of relational functional expressions.

[0116] Further, the first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a number of symmetrical short-circuit current breaking tests;

[0117] The model optimization module optimizes the model parameters in the initial black box model according to the first experimental result to generate a black box model, including:

[0118] Obtaining the first arc current in a number of symmetrical short-circuit current breaking tests;

[0119] Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated;

[0120] The optimization operation includes:

[0121] Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model;

[0122] Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated;

[0123] Comparing the arc voltages to be evaluated with the corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function;

[0124] When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters;

[0125] When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

[0126] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0127] Those skilled in the art can clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0128] Another preferred embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a method for evaluating the breaking capacity of a high-voltage gas circuit breaker as described in any one of the above embodiments is implemented.

[0129] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0130] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0131] The memory can be used to store the computer program, and the processor realizes various functions of the terminal device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Med ia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0132] Another preferred embodiment of the present invention provides a storage medium, the storage medium is a computer-readable storage medium, the computer program is stored in the computer-readable storage medium, and the computer program, when executed by the processor, can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0133] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker, characterized in that: include: Acquire structural parameters and design parameters of a high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test; Constructing an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and the design parameters; According to the first experimental result, optimizing the model parameters in the initial black box model to generate a black box model; Applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result; According to the second experimental result, the breaking performance of the high-voltage gas circuit breaker is determined.

2. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to claim 1, characterized in that: The initial black box model of the high-voltage gas circuit breaker is constructed according to the structural parameters and the design parameters, comprising: According to the structural parameters and the design parameters, several relational function formulas are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational function formulas include: a first relational function formula for characterizing the association between the contact and the nozzle of the high-voltage gas circuit breaker during the opening process, a second relational function formula for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational function formula for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process; The initial black box model is constructed according to the plurality of relational functional expressions.

3. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to claim 2, characterized in that: The first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a plurality of symmetrical short-circuit current breaking tests; The step of optimizing the model parameters in the initial black box model according to the first experimental result to generate a black box model includes: Obtaining the first arc current in a number of symmetrical short-circuit current breaking tests; Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated; The optimization operation includes: Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model; Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated; Comparing the arc voltages to be evaluated with the corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function; When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters; When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

4. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to claim 3, characterized in that: The second experimental result includes: in each of the asymmetric short-circuit current breaking tests, the second arc voltage and the loop current measured when the high-voltage gas circuit breaker is broken; Determining the breaking performance of the high-voltage gas circuit breaker according to the second experimental result includes: Obtaining an expected zero point of each of the asymmetric short-circuit current breaking tests; After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is not lower than a preset breaking arc extinction peak threshold, it is determined that the high-voltage gas circuit breaker has breaking performance under corresponding test conditions; After the expected zero point is determined, when the loop current is not zero, or an electrical breakdown phenomenon occurs, or a thermal breakdown phenomenon occurs, it is determined that the high-voltage gas circuit breaker does not have a breaking performance under the corresponding test conditions.

5. A method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to claim 4, characterized in that: After obtaining the expected zero point of each asymmetric short-circuit current breaking test, the method further includes: After determining the expected zero point, when the loop current remains zero and the arc extinction peak value of the second arc voltage is lower than the preset arc extinction peak threshold, it is determined that the breaking capacity of the high-voltage gas circuit breaker under the corresponding test conditions cannot be evaluated.

6. A breaking capacity evaluation device for a high-voltage gas circuit breaker, characterized in that: include: A parameter acquisition module, used to acquire structural parameters and design parameters of the high-voltage gas circuit breaker to be evaluated, and a first experimental result of the high-voltage gas circuit breaker in a symmetrical short-circuit current breaking test; A model building module, used to build an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and design parameters; A model optimization module, used to optimize the model parameters in the initial black box model according to the first experimental result to generate a black box model; A simulation test module, used for applying the black box model to a preset simulation loop, performing an asymmetric short-circuit current breaking test under different test conditions, and recording a second experimental result; A performance evaluation module is used to determine the breaking performance of the high-voltage gas circuit breaker according to the second experimental result.

7. A breaking capacity evaluation device for a high-voltage gas circuit breaker according to claim 6, characterized in that: The model building module builds an initial black box model of the high-voltage gas circuit breaker according to the structural parameters and the design parameters, including: According to the structural parameters and the design parameters, several relational function formulas are generated for characterizing the actions of various components of the high-voltage gas circuit breaker during the opening process; wherein the relational function formulas include: a first relational function formula for characterizing the association between the contact and the nozzle of the high-voltage gas circuit breaker during the opening process, a second relational function formula for characterizing the cross-sectional area of ​​the nozzle and the current flowing through the nozzle during the opening process, and a third relational function formula for characterizing the arcing time of the high-voltage gas circuit breaker during the opening process; The initial black box model is constructed according to the plurality of relational functional expressions.

8. A breaking capacity evaluation device for a high-voltage gas circuit breaker according to claim 7, characterized in that: The first experimental result includes: a first arc voltage measured when the high-voltage gas circuit breaker is broken in a plurality of symmetrical short-circuit current breaking tests; The model optimization module optimizes the model parameters in the initial black box model according to the first experimental result to generate a black box model, including: Obtaining the first arc current in a number of symmetrical short-circuit current breaking tests; Repeating the optimization operation on the model of the initial black box model according to the arc current and the first arc voltage until the black box model is generated; The optimization operation includes: Obtaining a black box model to be optimized; initially, the black box model to be optimized is the initial black box model; Inputting the first arc current into the black box model to be optimized, and solving the black box model to be optimized to generate an arc voltage to be evaluated; Comparing the arc voltages to be evaluated with the corresponding arc voltages, and calculating the fitness of the black box model to be optimized according to a preset fitness function; When the fitness is not less than a preset fitness threshold, optimizing the model parameters in the black box model to be optimized according to the fitness, and generating the black box model to be optimized required for the next round of optimization operation according to the optimized model parameters; When the fitness is less than a preset fitness threshold, the black box model to be optimized is used as the black box model.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a method for evaluating the breaking capacity of a high-voltage gas circuit breaker as claimed in any one of claims 1 to 5 is implemented.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a method for evaluating the breaking capacity of a high-voltage gas circuit breaker according to any one of claims 1 to 5.

Images