A circuit breaker breaking capacity evaluation method and device, electronic equipment and storage medium

Abstract

The present application relates to the technical field of circuit breaker, and discloses a circuit breaker breaking capacity evaluation method and device, electronic equipment and storage medium, the method obtains actual short-circuit current data and breaking test data of the circuit breaker to be evaluated; the breaking capacity of the circuit breaker to be evaluated is checked for the first time according to the actual short-circuit current data and the breaking test data; when the breaking capacity of the circuit breaker to be evaluated is checked for the first time and passes, the cumulative charge equivalent method is used to check the breaking capacity of the circuit breaker under the condition that the DC component is over-standard for the second time; when the breaking capacity of the circuit breaker under the condition that the DC component is over-standard is checked for the second time and passes, the DC component time constant of the breaking test data is increased, and the circuit breaker to be evaluated is subjected to a breaking test based on the increased DC component time constant, and whether the breaking capacity of the circuit breaker to be evaluated passes is checked by using the breaking test data, which is suitable for the rapid evaluation of the breaking capacity of the circuit breaker in engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breakers, in particular to a circuit breaker breaking capacity evaluation method and device, electronic equipment and storage medium. BACKGROUND

[0002] With the continuous strengthening of the power grid, the high level of short-circuit current has become a prominent problem affecting the planning and operation of regional power grids. The full current of short-circuit current under asymmetric breaking includes short-circuit current alternating component and short-circuit current direct component, which will affect the breaking capacity of the circuit breaker. In the analysis of short-circuit current and the selection of switching equipment, the current mainly focuses on whether the short-circuit current alternating component meets the breaking current requirement of the circuit breaker, and lacks in-depth research on the influence of the direct component. With the continuous application of large-capacity generators and transformers, the ratio of reactance to resistance of primary equipment is increasing, and the time constant of short-circuit current direct component is gradually increasing, making the problem of direct component exceeding the standard prominent, and further affecting the short-circuit breaking capacity of high-voltage circuit breakers, which is easy to cause switch failure.

[0003] However, the current selection of circuit breakers is mainly based on the short-circuit current breaking performance, and the focus is mainly on the calculation and verification of the short-circuit current periodic component. In actual engineering application, the influence of the direct component of short-circuit current and its decay on the breaking performance of the circuit breaker lacks due attention and related research, resulting in a large amount of stock switches with the risk of failure (the effective value of short-circuit current alternating component does not exceed the standard, but the time constant of direct component exceeds the standard), and lacking effective technical measures to prevent and control the switch failure risk caused by the direct component exceeding the standard of the stock switch.

[0004] The current commonly used method for evaluating the breaking capacity of circuit breakers is based on arc magneto-hydrodynamics (MHD) simulation. However, for large power grids, circuit breakers with short-circuit current direct component exceeding the standard involve a large number of different types and voltage levels, with large structural differences, requiring a large amount of calculation time, which is not time-efficient and difficult to adapt to engineering evaluation. SUMMARY

[0005] Therefore, the present application provides a circuit breaker breaking capacity evaluation method, device, electronic equipment and storage medium, which solves the technical problem that circuit breakers with short-circuit current direct component exceeding the standard involve a large number of different types and voltage levels, with large structural differences, requiring a large amount of calculation time, which is not time-efficient and difficult to adapt to engineering evaluation.

[0006] The first aspect of the present application provides a circuit breaker breaking capacity evaluation method, comprising:

[0007] obtaining actual short-circuit current data and breaking test data of the circuit breaker to be evaluated;

[0008] firstly check the breaking capacity of the breaker to be evaluated according to the actual short-circuit current data and the breaking test data;

[0009] when the first check of the breaking capacity of the breaker to be evaluated is passed, then the cumulative charge equivalent method is used to secondly check the breaking capacity of the breaker under the condition of over-standard DC component;

[0010] when the second check of the breaking capacity of the breaker under the condition of over-standard DC component is passed, then the DC component time constant of the breaking test data is increased, and the breaker to be evaluated is subjected to a breaking test based on the increased DC component time constant;

[0011] whether the breaking capacity of the breaker to be evaluated is passed according to the breaking test data corresponding to the increased DC component time constant is checked.

[0012] Preferably, the actual short-circuit current data includes an actual short-circuit current AC component effective value and an actual short-circuit current AC component time constant; and the breaking test data includes a rated breaking current, a rated peak withstand current and a DC component time constant.

[0013] The step of firstly checking the breaking capacity of the breaker to be evaluated according to the actual short-circuit current data and the breaking test data includes:

[0014] comparing the actual short-circuit current AC component effective value with the rated breaking current;

[0015] when the actual short-circuit current AC component effective value is greater than or equal to the rated breaking current, then the check of the breaking capacity of the breaker to be evaluated is failed;

[0016] when the actual short-circuit current AC component effective value is less than the rated breaking current, then the check of the breaking capacity of the breaker to be evaluated is passed, and the next step of check is performed;

[0017] determining an actual short-circuit current peak value according to the actual short-circuit current AC component effective value and the actual short-circuit current AC component time constant;

[0018] comparing the actual short-circuit current peak value with the rated peak withstand current;

[0019] when the actual short-circuit current peak value is greater than or equal to the rated peak withstand current, then the check of the breaking capacity of the breaker to be evaluated is failed;

[0020] when the actual short-circuit current peak value is less than the rated peak withstand current, then the first check of the breaking capacity of the breaker to be evaluated is passed.

[0021] Preferably, the step of checking the breaking capacity of the circuit breaker under over-standard DC component by using the cumulative charge equivalence method for the second time comprises:

[0022] determining an actual short-circuit current time sequence waveform and a test short-circuit current time sequence waveform according to the actual short-circuit current data and the breaking test data respectively;

[0023] determining an actual short-circuit current last half-waveform and a test short-circuit current last half-waveform according to the actual short-circuit current time sequence waveform and the test short-circuit current time sequence waveform, the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform being waveforms between two zero-crossing points after the instant of breaking respectively corresponding to the actual short-circuit current time sequence waveform and the test short-circuit current time sequence waveform respectively;

[0024] performing time integral operation on short-circuit currents corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform respectively to obtain cumulative charges corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform respectively;

[0025] comparing the cumulative charges corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform respectively;

[0026] when the cumulative charge corresponding to the actual short-circuit current last half-waveform is greater than the cumulative charge corresponding to the test short-circuit current last half-waveform, determining that the breaking capacity of the circuit breaker under over-standard DC component fails;

[0027] when the cumulative charge corresponding to the actual short-circuit current last half-waveform is not greater than the cumulative charge corresponding to the test short-circuit current last half-waveform, determining that the breaking capacity of the circuit breaker under over-standard DC component passes.

[0028] Preferably, when the breaking capacity of the circuit breaker to be evaluated fails to pass the check, the circuit breaker is optimized.

[0029] Preferably, the step of optimizing the circuit breaker comprises:

[0030] initializing a latching pressure of the circuit breaker as an initial gas charge pressure;

[0031] accumulating the initial gas charge pressure by a preset pressure increase step to determine gas charge pressures under a plurality of different pressure increase steps and corresponding withstand breakdown voltages;

[0032] fitting the gas charge pressures under the plurality of different pressure increase steps and the corresponding withstand breakdown voltages to obtain a gas charge pressure-withstand breakdown voltage fitting relationship;

[0033] determining the optimal inflation pressure of the circuit breaker by the preset maximum withstand breakdown voltage based on the inflation pressure-resistance breakdown voltage fitting relationship;

[0034] setting the optimal inflation pressure of the circuit breaker as the initial inflation pressure of the circuit breaker.

[0035] Preferably, the step of optimizing the circuit breaker comprises:

[0036] initializing the opening stroke curve of the circuit breaker, the opening stroke curve sequentially comprising an acceleration interval, a speed maintaining interval and a buffer interval in time sequence;

[0037] adjusting the opening change speed and the opening time of each interval in the opening stroke curve, and performing air flow field simulation on the circuit breaker based on the adjusted opening stroke curve to simulate the air flow field data generated by the circuit breaker in the opening process;

[0038] judging whether the air flow field data meets the arc extinguishing design of the arc extinguishing chamber of the circuit breaker;

[0039] when it is judged that the air flow field data does not meet the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, then turning to the step of adjusting the opening change speed and the opening time of each interval in the opening stroke curve, and performing air flow field simulation on the circuit breaker based on the adjusted opening stroke curve to simulate the air flow field data generated by the circuit breaker in the opening process, until it is judged that the air flow field data meets the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, and outputting the optimal opening stroke curve;

[0040] optimizing the opening process of the circuit breaker by using the optimal opening stroke curve.

[0041] Preferably, the step of optimizing the circuit breaker comprises:

[0042] geometrically modeling according to the structure of the circuit breaker to obtain a two-dimensional geometric model of the circuit breaker;

[0043] establishing a multi-physics coupled arc magneto-hydrodynamic model according to the two-dimensional geometric model of the circuit breaker;

[0044] performing simulation calculation according to the multi-physics coupled arc magneto-hydrodynamic model to obtain the post-arc current of the circuit breaker;

[0045] taking the nozzle structure parameters of the circuit breaker as decision variables, taking the minimization of the post-arc current of the circuit breaker as the optimization objective, and determining the geometric structure parameter limit of the circuit breaker as the constraint to construct a nozzle structure optimization model of the circuit breaker;

[0046] Optimize and solve the nozzle structure optimization model of the circuit breaker by using the arc magneto-hydrodynamic model, to obtain the optimal nozzle structure parameters of the circuit breaker.

[0047] Optimize the nozzle structure of the circuit breaker by using the optimal nozzle structure parameters of the circuit breaker.

[0048] In a second aspect, the present application further provides a circuit breaker breaking capacity evaluation device, comprising:

[0049] A data acquisition module is configured to acquire actual short-circuit current data and breaking test data of a circuit breaker to be evaluated.

[0050] A first checking module is configured to check the breaking capacity of the circuit breaker to be evaluated for the first time according to the actual short-circuit current data and the breaking test data.

[0051] A second checking module is configured to check the breaking capacity of the circuit breaker under the condition of over-standard DC component for the second time by using the cumulative charge equivalent method when the breaking capacity of the circuit breaker to be evaluated is checked for the first time and passes.

[0052] A test checking module is configured to increase the DC component time constant of the breaking test data and perform a breaking test on the circuit breaker to be evaluated based on the increased DC component time constant when the breaking capacity of the circuit breaker under the condition of over-standard DC component is checked for the second time and passes.

[0053] A third checking module is configured to check whether the breaking capacity of the circuit breaker to be evaluated passes according to the breaking test data corresponding to the increased DC component time constant.

[0054] In a third aspect, the present application further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to make the processor execute the steps of the circuit breaker breaking capacity evaluation method according to the first aspect.

[0055] In a fourth aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed to implement the steps of the circuit breaker breaking capacity evaluation method according to the first aspect.

[0056] As can be seen from the above technical solutions, the present application has the following advantages:

[0057] The application evaluates the breaking capacity of the circuit breaker by the actual short-circuit current data and the breaking test data of the circuit breaker, also evaluates the breaking capacity of the circuit breaker under the condition of over-standard DC component by the cumulative charge equivalent method, and further evaluates the breaking test data of the circuit breaker by increasing the time constant of the DC component of the breaking test data, so as to evaluate the breaking capacity of the circuit breaker by the multi-level evaluation method, which is suitable for the rapid evaluation of the breaking capacity of the circuit breaker in engineering, improves the timeliness of the evaluation, and avoids the rectification of a large number of existing circuit breakers. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 An application environment schematic diagram of a circuit breaker breaking capacity evaluation method provided by an embodiment of the application is shown in the figure.

[0059] Figure 2 A flowchart of a circuit breaker breaking capacity evaluation method provided by an embodiment of the application is shown in the figure.

[0060] Figure 3 A short-circuit current time sequence waveform diagram provided by an embodiment of the application is shown in the figure.

[0061] Figure 4 A circuit breaker opening stroke curve diagram provided by an embodiment of the application is shown in the figure.

[0062] Figure 5 A structure schematic diagram of a nozzle structure provided by an embodiment of the application is shown in the figure.

[0063] Figure 6 A structure schematic diagram of a circuit breaker breaking capacity evaluation device provided by an embodiment of the application is shown in the figure.

[0064] Figure 7 A structure schematic diagram of an electronic device provided by an embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0065] In order to enable personnel in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0066] The circuit breaker breaking capacity evaluation method provided by the embodiment of the present application can be applied to, for example Figure 1The application environment shown. Among them, the simulator communicates with the server 102, the simulator is used to simulate the circuit breaker, and outputs the simulation data to the server 102, wherein the simulation data includes the breaking operation data of the circuit breaker. The data storage system can store the data required by the server 102 to process. The data storage system can be integrated on the server 102, or placed on the cloud or other network servers. The server 102 can be a standalone physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0067] As Figure 2 shown, the circuit breaker breaking capacity evaluation method provided by the embodiment of the application, the method is applied to Figure 1 the server 102 in the server 102 as an example for description, including steps S1 to S5. Among them:

[0068] Step S1, obtaining the actual short-circuit current data of the circuit breaker to be evaluated, and the breaking test data.

[0069] Among them, the actual short-circuit current data is the short-circuit current data obtained for the circuit breaker in actual operation, and the actual short-circuit current data includes the actual short-circuit current alternating component effective value and the actual short-circuit current alternating component time constant.

[0070] The breaking test data is the type test data of the circuit breaker to carry out breaking test, and the breaking test data includes the rated breaking current, the rated peak withstand current and the DC component time constant.

[0071] Step S2, according to the actual short-circuit current data and the breaking test data, the breaking capacity of the circuit breaker to be evaluated is checked for the first time.

[0072] Among them, the process of checking the breaking capacity of the circuit breaker to be evaluated for the first time according to the actual short-circuit current data and the breaking test data includes:

[0073] Step S201, comparing the actual short-circuit current alternating component effective value with the rated breaking current;

[0074] Step S202, when the actual short-circuit current alternating component effective value is greater than or equal to the rated breaking current, the breaking capacity of the circuit breaker to be evaluated is not passed;

[0075] Step S203, when the actual short-circuit current alternating component effective value is less than the rated breaking current, the breaking capacity of the circuit breaker to be evaluated is passed, and the next step of checking is executed.

[0076] Step S204, determining the actual short-circuit current peak value according to the actual short-circuit current alternating component effective value and the actual short-circuit current alternating component time constant.

[0077] wherein the calculation method of the actual short-circuit current peak value is:

[0078]

[0079] wherein, is the actual short-circuit current peak value, is the actual short-circuit current AC component effective value, is the angular frequency, is the time, is the actual short-circuit current AC component time constant.

[0080] Step S205, compare the actual short-circuit current peak value with the rated peak withstand current.

[0081] Step S206, when the actual short-circuit current peak value is greater than or equal to the rated peak withstand current, then the breaking capacity of the circuit breaker to be evaluated fails the first check.

[0082] Step S207, when the actual short-circuit current peak value is less than the rated peak withstand current, then the breaking capacity of the circuit breaker to be evaluated passes the first check.

[0083] It should be noted that after the breaking capacity of the circuit breaker to be evaluated passes the first check, the breaking capacity of the circuit breaker to be evaluated needs to be further checked.

[0084] In addition, in some embodiments, steps S204-S207 can be performed first, and then steps S201-S203 can be performed. Meanwhile, when the breaking capacity of the circuit breaker fails the first check, the circuit breaker can be replaced or optimized to improve timeliness.

[0085] Step S3, when the breaking capacity of the circuit breaker to be evaluated passes the first check, then the cumulative charge equivalent method is used to check the breaking capacity of the circuit breaker under the condition of excessive DC component for the second time.

[0086] In order to ensure that the circuit breaker can work reliably under various conditions, especially in the case of high DC component, the cumulative charge equivalent method can be used to check the breaking capacity of the circuit breaker.

[0087] The cumulative charge equivalent method is to convert the influence of the DC component in the fault current on the circuit breaker into an equivalent charge amount, and then evaluate whether the circuit breaker can successfully break the fault current according to the equivalent charge amount.

[0088] Specifically, the process of using the cumulative charge equivalent method to check the breaking capacity of the circuit breaker under the condition of excessive DC component for the second time includes:

[0089] Step S301: Determine the actual short-circuit current timing waveform and the test short-circuit current timing waveform based on the actual short-circuit current data and the breaking test data, respectively.

[0090] The short-circuit current timing waveform is as follows: Figure 3 As shown.

[0091] Step S302: Determine the last half waveform of the actual short-circuit current and the last half waveform of the test short-circuit current based on the actual short-circuit current timing waveform and the test short-circuit current timing waveform. The last half waveform of the actual short-circuit current and the last half waveform of the test short-circuit current are the waveforms between the two zero-crossing points after the moment of separation of the actual short-circuit current timing waveform and the test short-circuit current timing waveform, respectively.

[0092] The judgment of the last half waveform can be determined based on the actual short-circuit current peak value or the rated peak withstand current.

[0093] For example, for the last half of the short-circuit current waveform, when the actual short-circuit current peak value is ≥0, the second zero-crossing point of the short-circuit current waveform after the initial split moment ( Figure 3 (at time t1) and the third zero crossing point ( Figure 3 The waveform between time t2 and t3 is called the last major half-wave of the short-circuit current; if the actual peak value of the short-circuit current is <0, then the waveform between the first zero-crossing point and the second zero-crossing point of the short-circuit current waveform after the moment is called the last major half-wave of the short-circuit current.

[0094] Similarly, for the last half of the waveform of the short-circuit current in the test, the rated peak withstand current is used for judgment.

[0095] Step S303: Perform time integration calculations on the short-circuit currents corresponding to the last half waveform of the actual short-circuit current and the last half waveform of the test short-circuit current to obtain the accumulated charge corresponding to the last half waveform of the actual short-circuit current and the last half waveform of the test short-circuit current.

[0096] Wherein, the accumulated charge Q of the last half-wave of the actual short-circuit current is the area formed by integrating the instantaneous value of the last half-wave of the actual short-circuit current with respect to the duration of the last half-wave, that is:

[0097]

[0098] The accumulated charge Q in the last half waveform of the test short-circuit current N It is the area formed by integrating the instantaneous value of the last half-wave of the short-circuit current with the duration of the last half-wave, i.e.:

[0099]

[0100] In the formula, , respectively are the starting time and the ending time of the last half-wave of the short-circuit current, is the peak value of the last half-wave of the test short-circuit current, is the rated breaking current, is the DC component time constant.

[0101] Step S304, compare the sizes of the accumulated charges corresponding to the last half-wave of the actual short-circuit current and the last half-wave of the test short-circuit current respectively;

[0102] Step S305, when the accumulated charge corresponding to the last half-wave of the actual short-circuit current is greater than the accumulated charge corresponding to the last half-wave of the test short-circuit current, it is determined that the breaking capacity of the circuit breaker under the over-standard DC component fails.

[0103] Step S306, when the accumulated charge corresponding to the last half-wave of the actual short-circuit current is not greater than the accumulated charge corresponding to the last half-wave of the test short-circuit current, it is determined that the breaking capacity of the circuit breaker under the over-standard DC component passes.

[0104] Step S4, when the second time the breaking capacity of the circuit breaker under the over-standard DC component passes, the DC component time constant of the breaking test data is increased, and the breaking test of the circuit breaker to be evaluated is carried out based on the increased DC component time constant.

[0105] It should be noted that the breaking test data can be carried out according to the national standard GB 1984 T100a test, at the same time, the DC component time constant of the existing circuit breaker is generally 45ms, in order to improve the breaking capacity of the circuit breaker under the over-standard DC component, the breaking test data under a higher DC component time constant can be carried out, such as 75ms, 100ms or 120ms, generally, the increasing step of the DC component time constant of the breaking test data is 25ms, and it cannot exceed the upper limit of the DC component time constant specified in the national standard GB 1984.

[0106] Step S5, according to the breaking test data corresponding to the increased DC component time constant, whether the breaking capacity of the circuit breaker to be evaluated passes or not.

[0107] When the breaking capacity of the circuit breaker to be evaluated is checked by the breaking test data corresponding to the increased DC component time constant, if the breaking capacity of the circuit breaker to be evaluated passes, the evaluation of the breaking capacity of the circuit breaker ends, if the breaking capacity of the circuit breaker to be evaluated fails, the circuit breaker is optimized.

[0108] It should be noted that the application checks the breaking capacity by the actual short-circuit current data and breaking test data of the circuit breaker, also checks the breaking capacity of the circuit breaker under the over-standard DC component by using the cumulative charge equivalent method, and also carries out breaking test data on the circuit breaker by increasing the time constant of the DC component of the breaking test data, so as to evaluate the breaking capacity of the circuit breaker by using the multi-level checking mode, which is suitable for the rapid evaluation of the breaking capacity of the circuit breaker in engineering, improves the timeliness of the evaluation, and avoids the rectification of a large number of stock circuit breakers.

[0109] In some embodiments, in order to optimize the breaking capacity of the circuit breaker, it is necessary to comprehensively analyze the influence of key factors such as chamber pressure, mechanical motion characteristics and nozzle structure on the breaking capacity of the circuit breaker, the application establishes an arc magnetic fluid dynamics model to analyze the influence law of the key factors on the breaking capacity, so as to determine the initial charging pressure, the opening speed and the nozzle structure design as three optimization methods for optimizing the circuit breaker.

[0110] Among them, the process of optimizing the initial charging pressure of the circuit breaker includes steps S601-S605.

[0111] Step S601, initialize the latching pressure of the circuit breaker as the initial charging pressure.

[0112] Step S602, accumulate the initial charging pressure by a preset pressure increase step length, and determine the charging pressure under a plurality of different pressure increase step lengths and the corresponding withstand breakdown voltage.

[0113] Among them, the pressure increase step length can be set to 0.05MPa.

[0114] Step S603, according to the charging pressure under a plurality of different pressure increase step lengths and the corresponding withstand breakdown voltage, fitting is carried out to obtain the fitting relationship between the charging pressure and the withstand breakdown voltage.

[0115] Among them, the fitting relationship between the charging pressure and the withstand breakdown voltage can be a linear function or a quadratic function.

[0116] Step S604, based on the fitting relationship between the charging pressure and the withstand breakdown voltage, the best charging pressure of the circuit breaker is determined by a preset maximum withstand breakdown voltage.

[0117] Among them, for the variation trend of the withstand breakdown voltage under different inflation pressures, the influence of increasing the initial inflation pressure on improving the withstand breakdown voltage is quantitatively analyzed based on the variation trend. Since the improvement of arc extinguishing performance by continuously increasing the inflation pressure will decrease, once the inflation pressure is increased to a certain extent, the arc extinguishing performance will tend to stabilize and no longer have a significant improvement. Moreover, it will have a certain impact on the safe operation and maintenance of the equipment. There will also be a maximum withstand breakdown voltage. The maximum withstand breakdown voltage is input into the inflation pressure-withstand breakdown voltage fitting relationship to determine the inflation pressure corresponding to the maximum withstand breakdown voltage as the optimal inflation pressure of the circuit breaker.

[0118] Step S605: Set the initial charging pressure of the circuit breaker using the optimal charging pressure of the circuit breaker.

[0119] The process of optimizing the circuit breaker's tripping stroke curve includes steps S611 to S615.

[0120] Step S611: Initialize the circuit breaker's tripping travel curve. The tripping travel curve includes, in sequence, the acceleration interval, the speed holding interval, and the buffer interval.

[0121] The circuit breaker's tripping travel curve is as follows: Figure 4 As shown, for high-current short-arc breaking, it is necessary to increase the SF6 gas density between the breaks to improve the breaking capacity, requiring the system to have a high opening speed to provide a high-voltage environment; for high-current long-arc breaking, an excessively high opening speed will cause the contacts to reach the opening end point in advance, which will weaken the blowing effect of the post-arc airflow, which is not conducive to the recovery of the medium strength, and thus lead to breaking failure. Therefore, in this case, the opening speed of the system cannot be too high.

[0122] Step S612: Adjust the opening change rate and opening time of each section within the opening stroke curve, and perform airflow field simulation on the circuit breaker based on the adjusted opening stroke curve to simulate the airflow field data generated by the circuit breaker during the opening process.

[0123] Among them, the opening time refers to Figure 4 t in f Generally, adjustments are made based on experience, with the opening time t determined by the initial opening stroke curve. f The circuit breaker can be moved forward by 0.5ms each time. Based on the forward movement time, the opening speed of each section in the opening stroke curve can be adjusted appropriately. The airflow field simulation of the circuit breaker is used to simulate the entire opening process and obtain the airflow field data generated by the circuit breaker during the opening process. The influence of airflow on the electric arc is analyzed to ensure that the electric arc can be extinguished within a reasonable time.

[0124] Step S613: Determine whether the airflow field data meets the arc extinguishing design of the circuit breaker's arc extinguishing chamber.

[0125] It should be noted that it is necessary to determine whether the arc extinguishing time corresponding to the new opening stroke curve is satisfied with the arc extinguishing design of the arc extinguishing chamber of the circuit breaker after each adjustment, and to ensure that the arc extinguishing effect is not affected while shortening the opening time.

[0126] Step S614, when it is judged that the gas flow field data does not satisfy the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, then go to step S612, until the gas flow field data satisfies the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, and output the optimal opening stroke curve.

[0127] Among them, through simulation, it is found that under certain gas flow field conditions, the arc can be reliably extinguished in a short time, and the pressure and temperature inside the arc extinguishing chamber are within the safe range, then it can be considered that the gas flow field and the arc extinguishing chamber are matched. On the contrary, if the arc cannot be extinguished within the expected time, or the pressure or temperature in the arc extinguishing chamber is too high, the gas flow field design or the arc extinguishing chamber structure needs to be adjusted again.

[0128] Step S615, using the optimal opening stroke curve to optimize the opening process of the circuit breaker.

[0129] Among them, the process of optimizing the nozzle structure of the circuit breaker includes steps S621-S626. Among them:

[0130] Step S621, according to the structure of the circuit breaker, a geometric model is established to obtain a two-dimensional geometric model of the circuit breaker.

[0131] Among them, according to the circuit breaker design drawing and the preliminary selected nozzle structure component geometric structure and size, a geometric model is established.

[0132] Among them, the nozzle structure is as shown in Figure 5 In order to study the influence of nozzle structure design on hot breaking, multiple factors can be considered, such as nozzle shape, size, nozzle angle, etc., to study the influence of different inputs on the output and find the optimal input combination. For example: selecting the nozzle throat diameter, nozzle expansion angle, and pressure cylinder inner diameter as input parameters, and selecting the arc resistance 100ns before zero crossing, critical recovery voltage rise rate, and post-arc current as output parameters, each input parameter is nozzle throat diameter (A1, A2, A3…An), pressure chamber inner diameter (B1, B2, B3…Bn), nozzle expansion angle (C1, C2, C3…Cn).

[0133] Figure 5 Among them, α is the upstream expansion angle of the nozzle, φ is the downstream expansion angle, d k is the diameter of the stationary contact, D t is the nozzle throat diameter, L k is the downstream length, Ld for downstream length, A h for annular gap cross-sectional area, A t for cross-sectional area at outlet, X is the inner diameter of the plenum. The nozzle structure such as nozzle shape and size, nozzle angle, plenum inner diameter, etc. will affect the breaking performance, and the initial nozzle structure design scheme is shown in Table 1.

[0134] Table 1. Nozzle structure parameter table

[0135]

[0136] Step S622, a multi-physical field coupled arc magnetohydrodynamic model is established according to the two-dimensional geometric model of the circuit breaker.

[0137] Among them, the physical field includes temperature field, pressure field, gas flow field and current field.

[0138] Step S623, simulation calculation is performed according to the multi-physical field coupled arc magnetohydrodynamic model, and the post-arc current of the circuit breaker is obtained.

[0139] Step S624, taking the nozzle structure parameters of the circuit breaker as the decision variables, minimizing the post-arc current of the circuit breaker as the optimization objective, and determining the geometric structure parameter limit of the circuit breaker as the constraint, a nozzle structure optimization model of the circuit breaker is constructed.

[0140] Step S625, the nozzle structure optimization model of the circuit breaker is optimized and solved by using the arc magnetohydrodynamic model, and the optimal nozzle structure parameters of the circuit breaker are obtained.

[0141] In the embodiment of the application, the orthogonal test method is used to optimize and solve the nozzle structure optimization model of the circuit breaker, specifically: the computational fluid dynamics simulation verifies the optimal design, if the model converges, the optimal design scheme of the circuit breaker nozzle can be obtained, if it does not converge, optimization needs to be continued, wherein, according to the parameter values in Table 1, a suitable orthogonal table is selected. After simulation processing of the above various structure parameters, the data is analyzed by using the range analysis method, and the simulation data influence factor analysis table is shown in Table 2.

[0142] Table 2. Simulation data influence factor analysis table

[0143]

[0144] By analyzing the simulation calculation results under different combinations, and according to the difficulty of the circuit breaker modification, the optimal nozzle structure parameters of the circuit breaker are determined, and the switch refusal risk is effectively avoided.

[0145] Step S626, the nozzle structure of the circuit breaker is optimized by using the optimal nozzle structure parameters of the circuit breaker.

[0146] Based on the same inventive concept, the application further provides a circuit breaker opening capacity evaluation device for the circuit breaker opening capacity evaluation method.

[0147] The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more circuit breaker opening capacity evaluation device embodiments provided below can refer to the limitations of the circuit breaker opening capacity evaluation method in the above text, which will not be repeated here.

[0148] As Figure 6 shown, the application further provides a circuit breaker opening capacity evaluation device, comprising:

[0149] A data acquisition module 100 is configured to acquire actual short-circuit current data of a circuit breaker to be evaluated and opening test data.

[0150] A first checking module 200 is configured to check the opening capacity of the circuit breaker to be evaluated for the first time according to the actual short-circuit current data and the opening test data.

[0151] A second checking module 300 is configured to, when the opening capacity of the circuit breaker to be evaluated is checked for the first time and passes, check the opening capacity of the circuit breaker under an over-standard DC component for the second time by using a cumulative charge equivalent method.

[0152] A test checking module 400 is configured to, when the opening capacity of the circuit breaker under the over-standard DC component is checked for the second time and passes, increase a DC component time constant of the opening test data, and perform an opening test on the circuit breaker to be evaluated based on the increased DC component time constant.

[0153] A third checking module 500 is configured to check whether the opening capacity of the circuit breaker to be evaluated passes according to the opening test data corresponding to the increased DC component time constant.

[0154] In some embodiments, the actual short-circuit current data includes an actual short-circuit current AC component effective value and an actual short-circuit current AC component time constant; and the opening test data includes a rated opening current, a rated peak withstand current, and a DC component time constant.

[0155] The first checking module 200 is configured to perform the process of checking the opening capacity of the circuit breaker to be evaluated for the first time according to the actual short-circuit current data and the opening test data, including:

[0156] Comparing the actual short-circuit current AC component effective value with the rated opening current;

[0157] When the actual short-circuit current AC component effective value is greater than or equal to the rated opening current, the opening capacity of the circuit breaker to be evaluated is checked as not passing.

[0158] When the actual short-circuit current AC component effective value is less than the rated breaking current, the breaking capacity of the circuit breaker to be evaluated is checked to pass, and the next step of checking is performed;

[0159] The actual short-circuit current peak value is determined according to the actual short-circuit current AC component effective value and the actual short-circuit current AC component time constant;

[0160] The actual short-circuit current peak value is compared with the rated peak withstand current;

[0161] When the actual short-circuit current peak value is greater than or equal to the rated peak withstand current, the breaking capacity of the circuit breaker to be evaluated is checked to fail to pass;

[0162] When the actual short-circuit current peak value is less than the rated peak withstand current, the breaking capacity of the circuit breaker to be evaluated is checked to pass for the first time.

[0163] In some embodiments, the second checking module 300 is specifically configured to determine an actual short-circuit current time sequence waveform and a test short-circuit current time sequence waveform according to actual short-circuit current data and breaking test data, respectively;

[0164] An actual short-circuit current last half-waveform and a test short-circuit current last half-waveform are determined according to the actual short-circuit current time sequence waveform and the test short-circuit current time sequence waveform, and the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform are respectively waveforms between two zero-crossing points after a just-dividing time corresponding to the actual short-circuit current time sequence waveform and the test short-circuit current time sequence waveform;

[0165] Cumulative charges corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform are obtained by performing time integral operation on short-circuit currents corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform, respectively;

[0166] The cumulative charges corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform are compared;

[0167] When the cumulative charge corresponding to the actual short-circuit current last half-waveform is greater than the cumulative charge corresponding to the test short-circuit current last half-waveform, it is determined that the breaking capacity of the circuit breaker under the condition of an over-standard DC component fails to pass;

[0168] When the cumulative charge corresponding to the actual short-circuit current last half-waveform is not greater than the cumulative charge corresponding to the test short-circuit current last half-waveform, it is determined that the breaking capacity of the circuit breaker under the condition of an over-standard DC component passes.

[0169] In some embodiments, the device further comprises an optimization module configured to optimize the circuit breaker when the breaking capacity of the circuit breaker to be evaluated fails to pass.

[0170] In some embodiments, the circuit breaker is optimized, including:

[0171] initializing a blocking pressure of the circuit breaker as an initial inflation pressure;

[0172] accumulating the initial inflation pressure by a preset pressure increase step to determine inflation pressures under a plurality of different pressure increase steps and corresponding withstand breakdown voltages;

[0173] fitting the inflation pressures under the plurality of different pressure increase steps and the corresponding withstand breakdown voltages to obtain an inflation pressure-withstand breakdown voltage fitting relationship;

[0174] determining an optimal inflation pressure of the circuit breaker by a preset maximum withstand breakdown voltage based on the inflation pressure-withstand breakdown voltage fitting relationship;

[0175] setting the optimal inflation pressure of the circuit breaker as the initial inflation pressure of the circuit breaker.

[0176] In some embodiments, the circuit breaker is optimized, including:

[0177] initializing a tripping stroke curve of the circuit breaker, the tripping stroke curve sequentially including an acceleration interval, a speed maintaining interval and a buffer interval in time sequence;

[0178] adjusting tripping change speeds and tripping times of each interval in the tripping stroke curve, and performing air flow field simulation on the circuit breaker based on the adjusted tripping stroke curve to simulate air flow field data generated by the circuit breaker in the tripping process;

[0179] judging whether the air flow field data meets arc extinguishing design of an arc extinguishing chamber of the circuit breaker;

[0180] when it is judged that the air flow field data does not meet the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, then turning to perform adjusting tripping change speeds and tripping times of each interval in the tripping stroke curve, and performing air flow field simulation on the circuit breaker based on the adjusted tripping stroke curve to simulate air flow field data generated by the circuit breaker in the tripping process, until it is judged that the air flow field data meets the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, and outputting an optimal tripping stroke curve;

[0181] optimizing the tripping process of the circuit breaker by the optimal tripping stroke curve.

[0182] In some embodiments, the circuit breaker is optimized, including:

[0183] performing geometric modeling according to a structure of the circuit breaker to obtain a two-dimensional geometric model of the circuit breaker;

[0184] establishing a multi-physics field coupled arc magneto-hydrodynamic model according to the two-dimensional geometric model of the circuit breaker.

[0185] According to the simulation calculation of the multi-physical field coupling arc magneto-hydrodynamic model, the post-arc current of the circuit breaker is obtained.

[0186] Taking the nozzle structure parameters of the circuit breaker as the decision variables, taking the minimization of the post-arc current of the circuit breaker as the optimization target, and determining the geometric structure parameter limit of the circuit breaker as the constraint, a nozzle structure optimization model of the circuit breaker is constructed.

[0187] The nozzle structure optimization model of the circuit breaker is solved by using the arc magneto-hydrodynamic model, and the optimal nozzle structure parameters of the circuit breaker are obtained.

[0188] The nozzle structure of the circuit breaker is optimized by using the optimal nozzle structure parameters of the circuit breaker.

[0189] As shown in Figure 7 The embodiment of the present application also provides an electronic device, and the electronic device 10 comprises a memory 20 and a processor 30, the memory 20 stores a computer program, and the computer program is executed by the processor 30, so that the processor 30 executes the steps of the circuit breaker breaking capacity evaluation method in any one of the above-mentioned embodiments.

[0190] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed to realize the steps of the circuit breaker breaking capacity evaluation method in any one of the above-mentioned embodiments.

[0191] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-mentioned system, electronic device and computer storage medium can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

[0192] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0193] In several embodiments provided by the present application, it can be understood that each block in the flowchart or block diagram can represent a module, a segment or a portion of code which includes one or more executable instructions for implementing the specified logic function. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figure. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or in the reverse order, depending on the functionality involved.

[0194] In several embodiments provided by the present application, it should be understood that the disclosed system, electronic device, computer storage medium and method can be implemented in other manners. For example, the described device embodiments are merely illustrative, and the division of the units is merely a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, or the among different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electric, mechanical or other forms.

[0195] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. In actual implementation, some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0196] In addition, each functional unit in the embodiments of the present application can be integrated in a processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of a software functional unit.

[0197] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the entire or part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for executing all or part of the steps of the method described in various embodiments of the present application by a computer device (which can be a personal computer, a server, or a network device, etc.). The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (English full name: Read-Only Memory, English abbreviation: ROM), a random access memory (English full name: Random Access Memory, English abbreviation: RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0198] The above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of evaluating the interrupting capability of a circuit breaker, characterized by, The method comprises the following steps: acquiring actual short-circuit current data and breaking test data of a circuit breaker to be evaluated; firstly checking breaking capacity of the circuit breaker to be evaluated according to the actual short-circuit current data and the breaking test data; when the first checking of the breaking capacity of the circuit breaker to be evaluated is passed, secondly checking breaking capacity of the circuit breaker under over-standard DC component by using cumulative charge equivalent method, comprising: determining actual short-circuit current time sequence waveform and test short-circuit current time sequence waveform respectively according to the actual short-circuit current data and the breaking test data; determining actual short-circuit current last half-waveform and test short-circuit current last half-waveform according to the actual short-circuit current time sequence waveform and the test short-circuit current time sequence waveform, wherein the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform are waveforms between two zero-crossing points after just breaking time corresponding to the actual short-circuit current time sequence waveform and the test short-circuit current time sequence waveform respectively; carrying out time integral operation on short-circuit currents corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform respectively to obtain cumulative charges corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform respectively; comparing sizes of the cumulative charges corresponding to the actual short-circuit current last half-waveform and the test short-circuit current last half-waveform respectively; when the cumulative charge corresponding to the actual short-circuit current last half-waveform is greater than the cumulative charge corresponding to the test short-circuit current last half-waveform, determining that the breaking capacity of the circuit breaker under over-standard DC component is not passed; when the cumulative charge corresponding to the actual short-circuit current last half-waveform is not greater than the cumulative charge corresponding to the test short-circuit current last half-waveform, determining that the breaking capacity of the circuit breaker under over-standard DC component is passed; when the second checking of the breaking capacity of the circuit breaker under over-standard DC component is passed, increasing a DC component time constant of the breaking test data, and performing breaking test on the circuit breaker to be evaluated based on the increased DC component time constant; checking whether the breaking capacity of the circuit breaker to be evaluated is passed according to the breaking test data corresponding to the increased DC component time constant.

2. The circuit breaker interrupting capability assessment method of claim 1, wherein, The actual short-circuit current data comprises actual short-circuit current AC component effective value and actual short-circuit current AC component time constant; the breaking test data comprises rated breaking current, rated peak withstand current and DC component time constant; The first checking of the breaking capacity of the circuit breaker to be evaluated according to the actual short-circuit current data and the breaking test data comprises: comparing sizes of the actual short-circuit current AC component effective value and the rated breaking current; when the actual short-circuit current AC component effective value is greater than or equal to the rated breaking current, determining that the breaking capacity of the circuit breaker to be evaluated is not passed; when the actual short-circuit current AC component effective value is less than the rated breaking current, determining that the breaking capacity of the circuit breaker to be evaluated is passed, and performing next step of checking. determining an actual short-circuit current peak value according to the actual short-circuit current AC component effective value and the actual short-circuit current AC component time constant; comparing the actual short-circuit current peak value with the rated peak withstand current; when the actual short-circuit current peak value is greater than or equal to the rated peak withstand current, it is determined that the breaking capacity of the circuit breaker to be evaluated fails to pass the check; when the actual short-circuit current peak value is less than the rated peak withstand current, it is determined that the breaking capacity of the circuit breaker to be evaluated passes the check for the first time.

3. The circuit breaker interrupting capability assessment method of claim 1, wherein, optimizing the circuit breaker when it is determined that the breaking capacity of the circuit breaker to be evaluated fails to pass the check.

4. The circuit breaker interrupting capability assessment method of claim 3, wherein, The step of optimizing the circuit breaker comprises: initializing the closing pressure of the circuit breaker as an initial inflation pressure; accumulating the initial inflation pressure by a preset pressure increase step to determine inflation pressures under a plurality of different pressure increase steps and corresponding withstand breakdown voltages; fitting the inflation pressures under a plurality of different pressure increase steps and corresponding withstand breakdown voltages to obtain an inflation pressure-withstand breakdown voltage fitting relationship; determining the optimal inflation pressure of the circuit breaker based on the inflation pressure-withstand breakdown voltage fitting relationship and a preset maximum withstand breakdown voltage; setting the optimal inflation pressure of the circuit breaker as the initial inflation pressure of the circuit breaker.

5. The circuit breaker interrupting capability assessment method of claim 3, wherein, The step of optimizing the circuit breaker comprises: initializing a tripping stroke curve of the circuit breaker, the tripping stroke curve sequentially comprising an acceleration interval, a speed maintaining interval and a buffer interval in time sequence; adjusting tripping change speeds and tripping times of each interval in the tripping stroke curve, performing air flow field simulation on the circuit breaker based on the adjusted tripping stroke curve to simulate air flow field data generated by the circuit breaker in the tripping process; determining whether the air flow field data meets arc extinguishing design of an arc extinguishing chamber of the circuit breaker; when it is determined that the air flow field data does not meet the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, returning to the step of adjusting tripping change speeds and tripping times of each interval in the tripping stroke curve, performing air flow field simulation on the circuit breaker based on the adjusted tripping stroke curve to simulate air flow field data generated by the circuit breaker in the tripping process until it is determined that the air flow field data meets the arc extinguishing design of the arc extinguishing chamber of the circuit breaker, and outputting an optimal tripping stroke curve; optimizing the tripping process of the circuit breaker by using the optimal tripping stroke curve.

6. The circuit breaker interrupting capability assessment method of claim 3, wherein, The step of optimizing the circuit breaker comprises: geometrically modeling the circuit breaker according to its structure to obtain a two-dimensional geometric model of the circuit breaker; establishing a multi-physics coupled arc magneto-hydrodynamic model according to the two-dimensional geometric model of the circuit breaker; performing simulation calculation according to the multi-physics coupled arc magneto-hydrodynamic model to obtain post-arc current of the circuit breaker; constructing a nozzle structure optimization model of the circuit breaker by taking nozzle structure parameters of the circuit breaker as decision variables, taking minimization of the post-arc current of the circuit breaker as an optimization objective, and determining geometric structure parameter limits of the circuit breaker as constraints; and optimizing the circuit breaker by using the optimal nozzle structure parameters. Optimize and solve the nozzle structure optimization model of the circuit breaker by using the electric arc magneto-hydrodynamic model, to obtain optimal nozzle structure parameters of the circuit breaker; Optimize the nozzle structure of the circuit breaker by using the optimal nozzle structure parameters of the circuit breaker.

7. A circuit breaker interrupting capability assessment device, characterized by, Comprise: A data acquisition module is configured to acquire actual short-circuit current data and breaking test data of a circuit breaker to be evaluated; A first verification module is configured to verify breaking capacity of the circuit breaker to be evaluated for the first time according to the actual short-circuit current data and the breaking test data; A second verification module is configured to, when the breaking capacity of the circuit breaker to be evaluated is verified for the first time and passes, verify breaking capacity of the circuit breaker under a condition of an over-standard DC component for the second time by using a cumulative charge equivalent method; Verifying the breaking capacity of the circuit breaker under the condition of the over-standard DC component for the second time by using the cumulative charge equivalent method comprises: Determining actual short-circuit current time sequence waveforms and test short-circuit current time sequence waveforms respectively according to the actual short-circuit current data and the breaking test data; Determining actual short-circuit current last half-waveforms and test short-circuit current last half-waveforms according to the actual short-circuit current time sequence waveforms and the test short-circuit current time sequence waveforms, the actual short-circuit current last half-waveforms and the test short-circuit current last half-waveforms being waveforms between two zero-crossing points after a just-breaking moment corresponding to the actual short-circuit current time sequence waveforms and the test short-circuit current time sequence waveforms respectively; Performing time integral operation on short-circuit currents corresponding to the actual short-circuit current last half-waveforms and the test short-circuit current last half-waveforms respectively to obtain cumulative charges corresponding to the actual short-circuit current last half-waveforms and the test short-circuit current last half-waveforms respectively; Comparing sizes of the cumulative charges corresponding to the actual short-circuit current last half-waveforms and the test short-circuit current last half-waveforms respectively; When the cumulative charge corresponding to the actual short-circuit current last half-waveforms is greater than the cumulative charge corresponding to the test short-circuit current last half-waveforms, determining that the breaking capacity of the circuit breaker under the condition of the over-standard DC component does not pass; When the cumulative charge corresponding to the actual short-circuit current last half-waveforms is not greater than the cumulative charge corresponding to the test short-circuit current last half-waveforms, determining that the breaking capacity of the circuit breaker under the condition of the over-standard DC component passes; A test verification module is configured to, when the breaking capacity of the circuit breaker under the condition of the over-standard DC component is verified for the second time and passes, increase a DC component time constant of the breaking test data, and perform a breaking test on the circuit breaker to be evaluated based on the increased DC component time constant; A third verification module is configured to verify whether the breaking capacity of the circuit breaker to be evaluated passes according to the breaking test data corresponding to the increased DC component time constant.

8. An electronic device, comprising: The electronic device comprises a memory and a processor, the memory stores a computer program, and the computer program is executed by the processor to make the processor execute the steps of the circuit breaker breaking capacity evaluation method in any one of claims 1 to 6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed, implements the steps of the circuit breaker breaking capacity assessment method according to any one of claims 1 to 6.

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