A method for detecting arc extinguishing performance of arc extinguishing chamber of circuit breaker

Abstract

The present invention relates to equipment performance intelligent detection technology, and specifically discloses a method for detecting arc extinguishing performance of a circuit breaker arc extinguishing chamber, which realizes the optimization design of arc extinguishing performance parameters of the arc extinguishing chamber and reduces the safety risks that may exist in the arc extinguishing process. The method includes: building a magnetic fluid simulation model based on magnetohydrodynamics, collecting historical arc parameters in the arc extinguishing chamber as test sample input, and updating the arc extinguishing simulation model; simulating and outputting simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber according to the arc extinguishing simulation model; analyzing the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber to determine whether the simulated arc morphology change state value meets the requirements; matching and detecting the simulated arc morphology change state value that meets the requirements with the preset standard arc chamber structural parameters; optimizing the arc extinguishing simulation model and correcting the simulation parameters, and adjusting the physical parameters and boundary condition settings in the model.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent detection of equipment performance, and in particular to a method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker. Background Art

[0002] In the power system, the circuit breaker is a key device used to control and protect the circuit. As the core component of the circuit breaker, the performance of the arc extinguishing chamber directly affects the breaking capacity and reliability of the circuit breaker. The traditional arc extinguishing chamber design method often relies on experience and trial and error, which is not only time-consuming and labor-intensive, but also difficult to ensure the optimality of the design.

[0003] Magnetic fluid simulation technology is a numerical simulation method based on the principle of magnetofluid dynamics (MHD). It can simulate the movement of the arc in the arc extinguishing chamber, including the arc shape, temperature distribution, pressure change, etc. Through magnetic fluid simulation, we can deeply understand the physical characteristics of the arc and provide a theoretical basis for the design of the arc extinguishing chamber.

[0004] The arc extinguishing performance parameters of the circuit breaker arc extinguishing chamber are optimized and designed using magnetic fluid simulation technology, which can realize the non-destructive detection process of the arc extinguishing chamber performance, and can fully realize the accurate detection and optimization of the arc extinguishing performance of the circuit breaker arc extinguishing chamber during the actual test process. Summary of the invention

[0005] The purpose of the present invention is to provide a method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker to solve the following technical problems:

[0006] How to optimize the design of arc extinguishing performance parameters of the arc extinguishing chamber to reduce possible safety risks during the arc extinguishing process.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker, the method comprising:

[0009] S1. Build a magnetic fluid simulation model based on magnetohydrodynamics, collect historical arc parameters in the arc extinguishing chamber as test sample input, output simulation parameters, and update the arc extinguishing simulation model;

[0010] S2. Perform simulation according to the arc extinguishing simulation model to output simulation images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber;

[0011] S3. Analyze the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber to determine whether the state value of the simulated arc morphology change meets the requirements:

[0012] If yes, go to step S4;

[0013] If not, proceed to step S5;

[0014] S4, matching the simulated arc shape change state value that meets the requirements with the preset standard arc chamber structure parameters, generating a warning signal and outputting the temperature change parameters and pressure change parameters of the monitoring point according to the matching detection results;

[0015] S5. Optimize the arc extinguishing simulation model and modify simulation parameters, and adjust the physical parameters and boundary condition settings in the model.

[0016] Preferably, the method of analyzing the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber in S3 to determine the state value of the simulated arc morphology change includes:

[0017] S31, extracting the magnetic field parameter variation curve in the simulation image And current parameter change curve ;

[0018] S32, respectively obtain the curve The mean and maximum values ​​of magnetic field parameters and the curves obtained in The mean value and maximum value of the current parameters in ;

[0019] S33. Obtain a simulated arc morphology change state value according to a mean value and a maximum value of a magnetic field parameter, a mean value and a maximum value of a current parameter.

[0020] Preferably, the method for obtaining the state value of the simulated arc shape change is:

[0021] Calculate the first Simulated arc shape change state value of each monitoring point :

[0022] ;

[0023] in, is the total number of parameters for simulating arc, and ∈ ; For the Monitoring point No. Item magnetic field parameter value, For the Monitoring point No. Item current parameter value; To obtain the curve The maximum value of the magnetic field parameter in To obtain the curve Mean values ​​of magnetic field parameters in ; To obtain the curve The maximum value of the current parameter in To obtain the curve Mean value of current parameters in ; For the Monitoring point No. The maximum value of the standard curve of the magnetic field parameter, For the Monitoring point No. Mean value of standard curve of magnetic field parameters; For the Monitoring point No. The maximum value of the standard curve of the current parameter, For the Monitoring point No. Mean value of standard curve of current parameters;

[0024] , , , They are respectively the first judgment function, the second judgment function, the third judgment function, and the fourth judgment function;

[0025] when ≥ hour, ;

[0026] when < hour, ;

[0027] when ≥ hour, ;

[0028] when < hour, ;

[0029] as well as:

[0030] when ≥ hour, ;

[0031] when < hour, ;

[0032] when ≥ hour, ;

[0033] when < hour, ;

[0034] in, For the The first allowable deviation value of the magnetic field parameter; For the The second allowable deviation value of the magnetic field parameter; For the The first allowable deviation value of the current parameter; For the The second allowable deviation value of the current parameter; For the The first preset fixed warning value corresponding to the magnetic field parameter, For the The second preset fixed warning value corresponding to the magnetic field parameter, For the The first preset fixed warning value corresponding to the current parameter, For the a second preset fixed warning value corresponding to the current parameter; For the The allowable error value of magnetic field parameters, For the The allowable value of current parameter error; , They are respectively a first preset adjustment coefficient and a second preset adjustment coefficient; For the The weight coefficient corresponding to the sum of the magnetic field parameters and current parameters of the simulated arc;

[0035] Change state value according to simulated arc shape For The rationality of the arc morphology changes is judged by simulating the arc morphology changes at each monitoring point.

[0036] Preferably, the state value changes according to the simulated arc shape For The rationality of the arc morphology change simulation at each monitoring point is judged by the following process:

[0037] Simulate the arc shape change state value With The threshold interval of the simulated arc shape change state at each monitoring point For comparison:

[0038] like ∈ , then judge the The simulated arc shape changes at each monitoring point are normal;

[0039] like < , then judge the The simulated arc morphology changes at the monitoring points were abnormally low;

[0040] like > ; then judge the The simulated arc morphology changes at the monitoring points were abnormally high.

[0041] Preferably, the method for matching and detecting the simulated arc morphology change state value that meets the requirements with the preset standard arc chamber structural parameters in S4 is:

[0042] The simulated arc shape change state value obtained at the monitoring position is obtained and input into the arc extinguishing simulation model to output the simulated arc chamber structural parameters;

[0043] Compare the simulated arc chamber structural parameters with the preset standard arc chamber structural parameters:

[0044] If the simulated arc chamber structural parameters are not less than the standard arc chamber structural parameters, the temperature change parameters and pressure change parameters of the monitoring point are output; otherwise, a first warning signal is generated.

[0045] Preferably, the matching detection further includes:

[0046] Calculate the matching coefficient , based on the simulated arc morphology change state value and arc chamber structural parameters:

[0047] ;

[0048] in, , , It is a weight coefficient determined according to the actual arc chamber structure; For the current The shape factor of the arc chamber internal structure at each monitoring point; is the arc chamber length, is the arc chamber radius, The curvature of the arc's bending degree; is the standard arc chamber length, is the standard arc chamber radius, The curvature is the standard arc bending degree.

[0049] Preferably, when judging Less than the preset threshold , it is considered that the current matching does not meet the requirements and a second warning signal is generated.

[0050] Preferably, it also includes arc extinguishing safety monitoring of temperature change parameters and pressure change parameters of the output monitoring points.

[0051] Preferably, by the formula Calculate the real-time risk value in the arc chamber ;

[0052] in, is the total number of monitoring points, and ∈ ; is the preset function, is the first preset weight coefficient, is a second preset weight coefficient; The monitoring end time, is the monitoring time period, is the first conversion function, is the second conversion function; is the real-time temperature change parameter, It is the real-time pressure change parameter;

[0053] Real-time risk value in arc chamber With preset threshold To compare:

[0054] like ≥ , it is judged that there is a safety risk in the arc extinguishing process in the arc chamber and a maintenance instruction is generated.

[0055] Beneficial effects of the present invention: the present invention designs an arc extinguishing simulation model by collecting historical arc parameters in an arc extinguishing chamber as test samples, simulates and outputs the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber for further analysis, judges whether the simulated arc morphology change state value meets the requirements by analyzing the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber, simulates the arc morphology by the laws of magnetic field changes and current changes, and the simulated arc morphology helps to determine the design of the internal structure of the arc extinguishing chamber; matches and detects the simulated arc morphology change state value that meets the requirements with the preset standard arc chamber structural parameters, generates an early warning signal and outputs the temperature change parameters and pressure change parameters of the monitoring points according to the matching detection results; realizes accurate analysis and detection of arc extinguishing performance; optimizes the arc extinguishing simulation model that does not meet the requirements and corrects the simulation parameters, adjusts the physical parameters and boundary condition settings in the model, realizes the accuracy optimization of the model and the precise adjustment of the arc changes in the simulated arc extinguishing chamber, so that the structure of the simulated arc extinguishing chamber is more in line with the requirements of actual safety applications.

[0056] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0058] Figure 1 A step diagram of a method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker according to the present invention;

[0059] Figure 2 This is a method step diagram for analyzing the simulated images of magnetic field changes and current changes in S3 of the present invention to determine the state of simulated arc morphology changes. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] See also Figure 1 As shown, the present invention is a method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker, the method comprising:

[0062] S1. Build a magnetic fluid simulation model based on magnetohydrodynamics, collect historical arc parameters in the arc extinguishing chamber as test sample input, output simulation parameters, and update the arc extinguishing simulation model;

[0063] S2. Perform simulation according to the arc extinguishing simulation model to output simulation images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber;

[0064] S3. Analyze the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber to determine whether the state value of the simulated arc morphology change meets the requirements:

[0065] If yes, go to step S4;

[0066] If not, proceed to step S5;

[0067] S4, matching the simulated arc shape change state value that meets the requirements with the preset standard arc chamber structure parameters, generating a warning signal and outputting the temperature change parameters and pressure change parameters of the monitoring point according to the matching detection results;

[0068] S5. Optimize the arc extinguishing simulation model and modify simulation parameters, and adjust the physical parameters and boundary condition settings in the model.

[0069] In the above technical solution, the design steps of the method for detecting the arc extinguishing performance of the arc extinguishing chamber of the circuit breaker in this embodiment are:

[0070] First, a magnetic fluid simulation model based on magnetohydrodynamics is built. Magnetic fluid simulation technology is a numerical simulation method based on the principle of magnetohydrodynamics (MHD). It can simulate the movement of the arc in the arc extinguishing chamber, including the shape of the arc, temperature distribution, pressure change, etc. Through magnetic fluid simulation, we can deeply understand the physical characteristics of the arc and provide a theoretical basis for the design of the arc extinguishing chamber.

[0071] By collecting the historical arc parameters in the arc extinguishing chamber as test samples and inputting them into the magnetofluid simulation model for model training, the simulation parameters are output and the arc extinguishing simulation model is updated. The output of the simulation parameters can also be used to reasonably arrange the test factors and levels through the statistical orthogonal test method to minimize the number of tests, obtain the factors that have the greatest impact on the arc extinguishing performance, and construct an arc extinguishing simulation model that meets the needs of this design.

[0072] Then, according to the magnetic fluid simulation model after the test simulation, that is, the arc extinguishing simulation model, a simulation is performed to output simulation images of the magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber; the data information of the magnetic field and current is further analyzed by analyzing the simulation images.

[0073] Next, the magnetic field changes and current changes are further analyzed. By analyzing the simulated images of the magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber, it is determined whether the simulated arc morphology change state value meets the requirements. If so, go to step S4; if not, go to step S5. The arc morphology is simulated by the laws of magnetic field changes and current changes. The simulated arc morphology helps to determine the design of the internal structure of the arc extinguishing chamber. If the arc morphology is unreasonable, it may lead to untimely or incomplete arc extinguishing. The electrode shape, the shape of the arc extinguishing chamber wall, etc. can be optimized through simulation, so that the arc can be extinguished in the shortest time.

[0074] Furthermore, the simulated arc morphology change state values ​​that meet the requirements are matched with the preset standard arc chamber structural parameters, and an early warning signal is generated and the temperature change parameters and pressure change parameters of the output monitoring points are output according to the matching detection results, thereby achieving accurate analysis and detection of arc extinguishing performance.

[0075] Finally, for those whose arc morphology change state values ​​judged by the simulation image do not meet the requirements, the arc extinguishing simulation model is optimized and the simulation parameters are corrected, and the physical parameters and boundary conditions in the model are adjusted to achieve the arc structure optimization of the model and the precise adjustment of the arc changes in the simulated arc extinguishing chamber, so that the structure of the simulated arc extinguishing chamber is more in line with the requirements of actual safety applications.

[0076] As an embodiment of the present invention, please refer to Figure 2 As shown, specifically, the method of analyzing the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber in step S3 to determine the state value of the simulated arc morphology change includes:

[0077] S31, extracting the magnetic field parameter variation curve in the simulation image And current parameter change curve ;

[0078] S32, respectively obtain the curve The mean and maximum values ​​of magnetic field parameters and the curves obtained in The mean value and maximum value of the current parameters in ;

[0079] S33. Obtain a simulated arc morphology change state value according to a mean value and a maximum value of a magnetic field parameter, a mean value and a maximum value of a current parameter.

[0080] In the above technical solution, the information acquisition of the simulated arc morphology change in step S3 is refined in this embodiment. Specifically, the magnetic field parameter change curve in the simulation image is first extracted. And current parameter change curve ; By analyzing the change curves of magnetic field parameters and current parameters, the detailed characteristic changes of magnetic field and current in the arc extinguishing process can be further reflected; then the curves are obtained respectively The mean and maximum values ​​of magnetic field parameters and the curves obtained in The mean value and maximum value of the current parameters in the curve are selected, and the main characteristic parameters of the magnetic field and current changes are judged by screening the main characteristics of the curve according to the characteristics of the curve change; finally, the state value of the simulated arc morphology change is obtained according to the mean value and maximum value of the magnetic field parameters, the mean value and maximum value of the current parameters, so as to realize the digital analysis results of the specific changes of the simulated arc in the arc extinguishing chamber.

[0081] As an implementation mode of the present invention, specifically, the method for obtaining the state value of the simulated arc shape change is:

[0082] Calculate the first Simulated arc shape change state value of each monitoring point :

[0083] ;

[0084] in, is the total number of parameters for simulating arc, different monitoring points in the arc extinguishing chamber and ∈ ; For the Monitoring point No. Item magnetic field parameter value, For the Monitoring point No. Item current parameter value; To obtain the curve The maximum value of the magnetic field parameter in To obtain the curve Mean values ​​of magnetic field parameters in ; To obtain the curve The maximum value of the current parameter in To obtain the curve Mean value of current parameters in ; For the Monitoring point No. The maximum value of the standard curve of the magnetic field parameter, For the Monitoring point No. Mean value of standard curve of magnetic field parameters; For the Monitoring point No. The maximum value of the standard curve of the current parameter, For the Monitoring point No. Mean value of standard curve of current parameters;

[0085] , , , They are respectively the first judgment function, the second judgment function, the third judgment function, and the fourth judgment function;

[0086] when ≥ hour, ;

[0087] when < hour, ;

[0088] when ≥ hour, ;

[0089] when < hour, ;

[0090] as well as:

[0091] when ≥ hour, ;

[0092] when < hour, ;

[0093] when ≥ hour, ;

[0094] when < hour, ;

[0095] in, For the The first allowable deviation value of the magnetic field parameter; For the The second allowable deviation value of the magnetic field parameter; For the The first allowable deviation value of the current parameter; For the The second allowable deviation value of the current parameter; For the The first preset fixed warning value corresponding to the magnetic field parameter, For the The second preset fixed warning value corresponding to the magnetic field parameter, For the The first preset fixed warning value corresponding to the current parameter, For the a second preset fixed warning value corresponding to the current parameter; For the The allowable error value of magnetic field parameters, For the The allowable value of current parameter error; , They are respectively a first preset adjustment coefficient and a second preset adjustment coefficient; For the The weight coefficient corresponding to the sum of the magnetic field parameters and current parameters of the simulated arc;

[0096] Change state value according to simulated arc shape For The rationality of the arc morphology changes is judged by simulating the arc morphology changes at each monitoring point.

[0097] In the above technical solution, in this embodiment, the formula Calculate the first Simulated arc shape change state value of each monitoring point :Through a comprehensive analysis of the magnetic field changes and current changes, based on the relationship and change characteristics between the mean and maximum values ​​of magnetic field parameters, the mean and maximum values ​​of current parameters, and combined with the acquisition of different monitoring positions to obtain the cumulative comprehensive changes of different simulated arcs, the morphological change state value is obtained. The rationality of the simulated arc morphology change at the monitoring point is judged by the size of the morphology change state value, so as to realize the accurate simulation of the arc extinguishing process in the arc chamber and reduce the probability of arc extinguishing safety problems.

[0098] It should be explained that the reference quantity involved in the above formula is , , , , preset adjustment coefficient , , error tolerance , And the corresponding weight coefficient All of them are obtained after fitting based on empirical test data, which will not be described in detail here; among them, the standard value , , , These are all standard parameters obtained by simulation calculation based on the simulation model and will not be described in detail here.

[0099] in addition, , When the fixed warning value is preset, or ,as well as or When Simulated arc shape change state value of each monitoring point Exceeds the threshold range.

[0100] As an embodiment of the present invention, according to the simulated arc shape change state value For The rationality of the arc morphology change simulation at each monitoring point is judged by the following process:

[0101] Simulate the arc shape change state value With The threshold interval of the simulated arc shape change state at each monitoring point For comparison:

[0102] like ∈ , then judge the The simulated arc shape changes at each monitoring point are normal;

[0103] like < , then judge the The simulated arc morphology changes at the monitoring points were abnormally low;

[0104] like > ; then judge the The simulated arc morphology changes at the monitoring points were abnormally high.

[0105] In the above technical solution, this embodiment simulates the arc shape change state value and The threshold interval of the simulated arc shape change state at each monitoring point The comparison method is used to judge the rationality of the arc shape change, in which the threshold interval of the simulated arc shape change state is It is obtained by fitting the empirical data, so ∈ When The simulated arc shape changes at the monitoring points are normal; < , then judge the The simulated arc morphology changes at the monitoring points were abnormally low, and > ; then judge the The simulated arc shape changes at each monitoring point are abnormally high, and the abnormal situation needs to be corrected and adjusted in time.

[0106] As an implementation mode of the present invention, the method for matching and detecting the simulated arc morphology change state value that meets the requirements with the preset standard arc chamber structural parameters in step S4 is:

[0107] The simulated arc shape change state value obtained at the monitoring position is obtained and input into the arc extinguishing simulation model to output the simulated arc chamber structural parameters;

[0108] Compare the simulated arc chamber structural parameters with the preset standard arc chamber structural parameters:

[0109] If the simulated arc chamber structural parameters are not less than the standard arc chamber structural parameters, the temperature change parameters and pressure change parameters of the monitoring point are output; otherwise, a first warning signal is generated.

[0110] In the above technical scheme, this embodiment performs a matching detection on the simulated arc morphology change value outputted from step S4 and the preset standard arc chamber structural parameters. The matching detection method is to first input the obtained simulated arc morphology change state value into the arc extinguishing simulation model for simulation calculation, output the simulated arc chamber structural parameters, and then compare the simulated arc chamber structural parameters with the preset standard arc chamber structural parameters through a comparison method, wherein the preset standard arc chamber structural parameters are calculated and fitted based on empirical data, and if it is determined that the simulated arc chamber structural parameters are not less than the standard arc chamber structural parameters, then the temperature change parameters and pressure change parameters of the monitoring point are output; otherwise, a first warning signal is generated.

[0111] As an implementation manner of the present invention, the matching detection further includes:

[0112] Calculate the matching coefficient , based on the simulated arc morphology change state value and arc chamber structural parameters:

[0113] ;

[0114] in, , , It is a weight coefficient determined according to the actual arc chamber structure; For the current The shape factor of the arc chamber internal structure at each monitoring point; is the arc chamber length, is the arc chamber radius, The curvature of the arc's bending degree; is the standard arc chamber length, is the standard arc chamber radius, The curvature is the standard arc bending degree;

[0115] Judgement Less than the preset threshold , it is considered that the current matching does not meet the requirements and a second warning signal is generated.

[0116] In the above technical solution, the matching detection in this embodiment also includes analyzing the normal changes in the arc morphology of the monitoring point of the output detection point and the arc chamber structural parameters to determine whether the current matching meets the requirements of the current monitoring point, and using the formula Calculate the matching coefficient. The current matching coefficient is less than the preset threshold. When , it is considered that the current matching does not meet the requirements, and further data analysis is performed based on the preliminary matching analysis in the previous step to achieve a more accurate determination of the current simulated arc shape.

[0117] As an implementation mode of the present invention, it also includes arc extinguishing safety monitoring of temperature change parameters and pressure change parameters of output monitoring points.

[0118] In the above technical solution, this embodiment also includes performing a safety analysis on the temperature change parameters and pressure change parameters collected under the arc extinguishing structure at the monitoring point locations that meet the requirements of the current arc extinguishing structure in the arc chamber to ensure the safe execution of the arc extinguishing process.

[0119] As an embodiment of the present invention, by formula Calculate the real-time risk value in the arc chamber ;

[0120] in, is the total number of monitoring points, and ∈ ; is the preset function, is the first preset weight coefficient, is a second preset weight coefficient; The monitoring end time, is the monitoring time period, is the first conversion function, is the second conversion function; is the real-time temperature change parameter, It is the real-time pressure change parameter;

[0121] And the real-time risk value in the arc chamber With preset threshold To compare:

[0122] like ≥ , it is judged that there is a safety risk in the arc extinguishing process in the arc chamber and a maintenance instruction is generated.

[0123] In the above technical solution, the formula Calculate the real-time risk value in the arc chamber , monitor the real-time changes in the arc chamber, conduct a comprehensive analysis of the temperature and pressure peaks of different changes within a preset time period, compare the size of the preset threshold of the real-time risk value range, and judge whether there is a safety risk in the arc extinguishing process in the arc chamber. ≥ , it is judged that there is a safety risk in the arc extinguishing process in the arc chamber and a maintenance instruction is generated.

[0124] It needs to be explained that the preset weight coefficient , All of them are obtained after fitting based on empirical test data, which will not be described in detail here; the preset function It is an adjustment function set according to historical data to ensure that the calculation result of the real-time risk value in the arc chamber is within a specific reasonable range. , the second conversion function They are all obtained by fitting the simulated test data under normal operating conditions of the arc chamber, and will not be described in detail here.

[0125] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0126] The above specific embodiments of this specification are described. Other embodiments are within the scope of the attached documents. In some cases, the actions or steps recorded in this application can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the process depicted in the accompanying drawings does not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0127] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined in this application, they shall all fall within the protection scope of the present invention.

Claims

1. A method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker, characterized in that: The method comprises: S1. Build a magnetic fluid simulation model based on magnetohydrodynamics, collect historical arc parameters in the arc extinguishing chamber as test sample input, output simulation parameters, and update the arc extinguishing simulation model; S2. Perform simulation according to the arc extinguishing simulation model to output simulation images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber; S3. Analyze the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber to determine whether the state value of the simulated arc morphology change meets the requirements: If yes, go to step S4; If not, proceed to step S5; S4, matching the simulated arc shape change state value that meets the requirements with the preset standard arc chamber structure parameters, generating a warning signal and outputting the temperature change parameters and pressure change parameters of the monitoring point according to the matching detection results; S5. Optimize the arc extinguishing simulation model and modify simulation parameters, and adjust the physical parameters and boundary condition settings in the model; The method of analyzing the simulated images of magnetic field changes and current changes at different monitoring points in the arc extinguishing chamber in S3 to determine the state value of the simulated arc morphology change includes: S31, extracting the magnetic field parameter variation curve in the simulation image And current parameter change curve ; S32, respectively obtain the curve The mean and maximum values ​​of magnetic field parameters and the curves obtained in The mean value and maximum value of the current parameters in ; S33. Obtain a simulated arc morphology change state value according to a mean value and a maximum value of a magnetic field parameter, a mean value and a maximum value of a current parameter.

2. A method for detecting arc extinguishing performance of a circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The method for obtaining the state value of the simulated arc shape change is: Calculate the first Simulated arc shape change state value of each monitoring point : ； in, is the total number of parameters for simulating arc, and ∈ ; For the Monitoring point No. Item magnetic field parameter value, For the Monitoring point No. Item current parameter value; To obtain the curve The maximum value of the magnetic field parameter in To obtain the curve Mean values ​​of magnetic field parameters in ; To obtain the curve The maximum value of the current parameter in To obtain the curve Mean value of current parameters in ; For the Monitoring point No. The maximum value of the standard curve of the magnetic field parameter, For the Monitoring point No. Mean value of standard curve of magnetic field parameters; For the Monitoring point No. The maximum value of the standard curve of the current parameter, For the Monitoring point No. Mean value of standard curve of current parameters; , , , They are respectively the first judgment function, the second judgment function, the third judgment function, and the fourth judgment function; when ≥ hour, ; when < hour, ; when ≥ hour, ; when < hour, ; as well as: when ≥ hour, ; when < hour, ; when ≥ hour, ; when < hour, ; in, For the The first allowable deviation value of the magnetic field parameter; For the The second allowable deviation value of the magnetic field parameter; For the The first allowable deviation value of the current parameter; For the The second allowable deviation value of the current parameter; For the The first preset fixed warning value corresponding to the magnetic field parameter, For the The second preset fixed warning value corresponding to the magnetic field parameter, For the The first preset fixed warning value corresponding to the current parameter, For the a second preset fixed warning value corresponding to the current parameter; For the The allowable error value of magnetic field parameters, For the The allowable value of current parameter error; , They are respectively a first preset adjustment coefficient and a second preset adjustment coefficient; For the The weight coefficient corresponding to the sum of the magnetic field parameters and current parameters of the simulated arc; Change state value according to simulated arc shape For The rationality of the arc morphology changes is judged by simulating the arc morphology changes at each monitoring point.

3. A method for detecting arc extinguishing performance of a circuit breaker arc extinguishing chamber according to claim 2, characterized in that: The state value according to the simulated arc shape change For The rationality of the arc morphology change simulation at each monitoring point is judged by the following process: The simulated arc shape change state value With The threshold interval of the simulated arc shape change state at each monitoring point For comparison: like ∈ , then judge the The simulated arc shape changes at each monitoring point are normal; like < , then judge the The simulated arc morphology changes at the monitoring points were abnormally low; like > ; then judge the The simulated arc morphology changes at the monitoring points were abnormally high.

4. A method for detecting arc extinguishing performance of a circuit breaker arc extinguishing chamber according to claim 1, characterized in that: The method for matching and detecting the simulated arc morphology change state value that meets the requirements with the preset standard arc chamber structural parameters in S4 is: The simulated arc shape change state value obtained at the monitoring position is obtained and input into the arc extinguishing simulation model to output the simulated arc chamber structural parameters; Compare the simulated arc chamber structural parameters with the preset standard arc chamber structural parameters: If the simulated arc chamber structural parameters are not less than the standard arc chamber structural parameters, the temperature change parameters and pressure change parameters of the monitoring point are output; otherwise, a first warning signal is generated.

5. A method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker according to claim 4, characterized in that: The matching detection also includes: Calculate the matching coefficient , based on the simulated arc morphology change state value and arc chamber structural parameters: ； in, , , It is a weight coefficient determined according to the actual arc chamber structure; For the current The shape factor of the arc chamber internal structure at each monitoring point; is the arc chamber length, is the arc chamber radius, The curvature of the arc's bending degree; is the standard arc chamber length, is the standard arc chamber radius, The curvature is the standard arc bending degree; Judgement Less than the preset threshold , it is considered that the current matching does not meet the requirements and a second warning signal is generated.

6. A method for detecting arc extinguishing performance of a circuit breaker arc extinguishing chamber according to claim 4, characterized in that: Also includes: The temperature change parameters and pressure change parameters of the output monitoring points are monitored for arc extinguishing safety.

7. A method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker according to claim 6, characterized in that: By formula Calculate the real-time risk value in the arc chamber ; in, is the total number of monitoring points, and ∈ ; is the preset function, is the first preset weight coefficient, is a second preset weight coefficient; The monitoring end time, is the monitoring time period, is the first conversion function, is the second conversion function; is the real-time temperature change parameter, It is the real-time pressure change parameter.

8. A method for detecting arc extinguishing performance of an arc extinguishing chamber of a circuit breaker according to claim 7, characterized in that: The real-time risk value in the arc chamber With preset threshold To compare: like ≥ , it is judged that there is a safety risk in the arc extinguishing process in the arc chamber and a maintenance instruction is generated.

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