Circuit breaker closing control method and device, computer equipment, readable storage medium and program product

Abstract

The invention relates to a circuit breaker closing control method and device, computer equipment, a readable storage medium and a program product. The method comprises the following steps: establishing a non-linear correction model, acquiring a corrected rigid opening and closing point of the circuit breaker according to a correction output signal output by the non-linear correction model, acquiring a relational expression between a closing phase angle of the circuit breaker and the breaking frequency of a mechanical contact, and calculating the breaking frequency of the mechanical contact according to the corrected rigid opening and closing point and the relational expression. And obtaining an insulation strength decline rate curve of the circuit breaker, determining a closing interval based on the insulation strength decline rate curve, and controlling the closing process of the circuit breaker according to the closing interval. By adopting the method, the closing time can be accurately predicted.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breaker control, and in particular to a circuit breaker closing control method, device, computer equipment, readable storage medium and program product. Background Art

[0002] During the operation of high-voltage circuit breakers, phase selection and closing is based on the monitored voltage and current phase signals and the accurate prediction of the circuit breaker action time to control the closing operation of the switchgear, thereby effectively avoiding the occurrence of closing inrush current, overvoltage and other problems. In actual applications, as the circuit breaker operates for a long time and the number of openings and closings increases, the stability of its operating mechanism will gradually decrease, and the problem of contact ablation will become increasingly serious, which will not only lead to a decrease in phase selection accuracy, but may also cause excessive closing inrush current, resulting in equipment damage, protection action, DC outage and other major accidents, posing a serious threat to the safe and stable operation of the power system.

[0003] In traditional methods, one-dimensional interpolation is usually performed on the experimental curve of the external parameters, and the time deviations obtained after the interpolation of each variable are added to obtain the actual action time of the circuit breaker in the current environment, and the time of issuing the circuit breaker closing command is adjusted accordingly.

[0004] However, due to the large difference between the laboratory environment and the actual working conditions, especially for circuit breakers working for a long time, changes in their internal structure will lead to large changes in mechanical and electrical insulation performance. Therefore, the compensation curve obtained based on the test may gradually deviate from the normal situation, thereby affecting the prediction accuracy of the closing time. Summary of the invention

[0005] Based on this, it is necessary to provide a circuit breaker closing control method, device, computer equipment, readable storage medium and program product that can accurately predict the closing time in response to the above technical problems.

[0006] In a first aspect, the present application provides a circuit breaker closing control method, comprising:

[0007] A nonlinear correction model is established; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening of the mechanical contact and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch;

[0008] According to the correction output signal output by the nonlinear correction model, the correction rigid opening and closing points of the circuit breaker are obtained;

[0009] Obtain the relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact, and obtain the insulation strength drop rate curve of the circuit breaker according to the corrected just-opening and just-closing points and the relationship expression;

[0010] The closing interval is determined based on the insulation strength drop rate curve, and the closing process of the circuit breaker is controlled according to the closing interval.

[0011] In one embodiment, the step of obtaining a relational expression between a closing phase angle of a circuit breaker and the number of opening and closing times of a mechanical contact comprises:

[0012] Build a physical model of the circuit breaker;

[0013] In the process of simulating the circuit breaker opening through the physical model, the closing breakdown voltage curve of the circuit breaker is obtained according to the changing state of the electric field intensity and the medium density of the air flow field;

[0014] Perform multiple breaking tests on the circuit breaker to obtain the closing test curve of the circuit breaker;

[0015] The closing breakdown voltage curve and closing test curve are compared and analyzed to obtain the relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contacts.

[0016] In one embodiment, the step of obtaining the insulation strength drop rate curve of the circuit breaker according to the corrected rigid-opening and rigid-closing points and the relational expression includes:

[0017] According to the corrected rigid-opening and rigid-closing points and the relational expressions, the critical breakdown field strength and breakdown voltage value of the circuit breaker are obtained;

[0018] According to the critical breakdown field strength and the breakdown voltage value, a pre-breakdown voltage curve is obtained, and the breakdown gap is determined according to the pre-breakdown voltage curve;

[0019] Perform nonlinear fitting on the breakdown voltage value and the breakdown gap to obtain a fitting relationship expression between the breakdown voltage value and the breakdown gap;

[0020] The derivative of the breakdown voltage value with respect to time is determined, and the insulation strength drop rate curve of the circuit breaker is obtained according to the derivative and the fitting relationship expression.

[0021] In one embodiment, the step of determining the closing interval based on the insulation strength decrease rate curve includes:

[0022] Obtaining a tangent curve between the insulation strength reduction rate curve and the externally applied voltage curve; the externally applied voltage curve is distributed in a coordinate system with time as the horizontal axis and voltage value as the vertical axis;

[0023] The intersection of the tangent curve and the horizontal axis is taken as the first boundary of the closing interval;

[0024] The tangent curve is adjusted according to the preset offset, and the intersection of the adjusted tangent curve and the horizontal axis is used as the second boundary of the closing interval.

[0025] In one embodiment, controlling the closing process of the circuit breaker according to the closing interval includes:

[0026] According to the insulation strength drop rate curve, obtain the change status of the closing interval;

[0027] According to the change state, the triggering moment of the closing instruction is determined so that the circuit breaker performs the closing operation according to the triggering moment.

[0028] In one embodiment, the method further comprises:

[0029] The nonlinear correction model is updated by genetic algorithm, and the correction rigid opening and closing points of the circuit breaker are re-obtained based on the updated nonlinear correction model.

[0030] In a second aspect, the present application also provides a circuit breaker closing control device, comprising:

[0031] The model correction module is used to establish a nonlinear correction model; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening and closing of the mechanical contact, and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch;

[0032] A correction point acquisition module, used to obtain the correction opening and closing points of the circuit breaker according to the correction output signal output by the nonlinear correction model;

[0033] The drop rate acquisition module is used to obtain the relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact, and obtain the insulation strength drop rate curve of the circuit breaker according to the corrected just-opening and just-closing points and the relationship expression;

[0034] The closing control module is used to determine the closing interval based on the insulation strength reduction rate curve, and control the closing process of the circuit breaker according to the closing interval.

[0035] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method steps of any one of the first aspects are implemented.

[0036] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements any one of the method steps in the first aspect when the computer program is executed by a processor.

[0037] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which implements any one of the method steps in the first aspect when executed by a processor.

[0038] The above-mentioned circuit breaker closing control method, device, computer equipment, readable storage medium and program product, by establishing a nonlinear correction model, obtain the corrected just-opening and just-closing points of the circuit breaker according to the correction output signal output by the nonlinear correction model, and can more accurately determine the key time point of the circuit breaker action, thereby providing a more accurate time reference for the closing control, avoiding inaccurate closing time due to signal error, and improving the accuracy of closing time prediction. In addition, by determining the closing interval according to the insulation strength reduction rate curve to control the closing process, the circuit breaker can be closed in a state where the insulation performance is relatively stable, reducing the loss of insulation materials, and reducing the insulation strength reduction rate, thereby extending the service life of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a schematic flow chart of a circuit breaker closing control method in one embodiment;

[0041] Figure 2 is a graph showing breakdown voltage changing with time in one embodiment;

[0042] Figure 3 is a schematic diagram of a closing interval in one embodiment;

[0043] Figure 4 is a flow chart of a circuit breaker closing control method in another embodiment;

[0044] Figure 5 is a structural block diagram of a circuit breaker closing control device in one embodiment;

[0045] Figure 6 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] In an exemplary embodiment, Figure 1As shown, a circuit breaker closing control method is provided, and the method is applied to a circuit breaker; the circuit breaker includes a mechanical contact, an auxiliary switch and an environmental parameter sensor as an example for explanation, and includes the following steps 102 to 108. Among them:

[0048] S102: Establish a nonlinear correction model; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening of the mechanical contact, and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch.

[0049] Optionally, when the operating mechanism of the circuit breaker is actuated and the mechanical contact (such as the arc contact of the arc extinguishing chamber) is disconnected, the auxiliary switch will generate a corresponding output signal, which is a reflection of the disconnection state of the mechanical contact. However, during the long-term operation of the circuit breaker, the signal will present nonlinear characteristics due to the influence of various environmental factors (such as temperature, energy storage pressure, control voltage, gas density of the arc extinguishing chamber, and gap time). For example, under normal circumstances, the output signal of the auxiliary switch may have a certain corresponding relationship in time with the opening and closing of the arc contact of the arc extinguishing chamber, but with the change of environmental factors, this corresponding relationship will deviate, so that the time difference between the change point of the auxiliary switch and the just-opening and just-closing point of the arc contact of the arc extinguishing chamber is no longer a linear relationship, resulting in the signal being unable to accurately reflect the actual opening and closing of the arc contact.

[0050] Furthermore, in order to correct the nonlinear error of the auxiliary switch output signal, environmental factors need to be taken into consideration. Through environmental parameter sensors such as temperature sensors, pressure sensors, voltage sensors, and gas density sensors, data of five environmental factors, namely temperature, energy storage pressure, control voltage, arc chamber gas density, and gap time, are collected. These environmental factors will have a significant impact on the performance of the auxiliary switch and are an important reason for the nonlinear error in the auxiliary switch output signal. Using these environmental parameter signals as the input of the nonlinear correction model allows the correction model to fully consider the impact of environmental factors on the auxiliary switch output signal. Specifically, the nonlinear correction model is constructed using a neural network. By using these two signals as inputs to establish a nonlinear correction model, the model can comprehensively process these complex signals that may have nonlinear relationships and output a correction output signal. This correction output signal can more accurately reflect the actual state of the circuit breaker than the original auxiliary switch signal. Among them, the correction output signal is the expected output or standard output of the auxiliary switch.

[0051] S104: Obtaining a corrected opening and closing point of the circuit breaker according to a corrected output signal output by the nonlinear correction model.

[0052] Optionally, the just-opening and just-closing points are key time points in the circuit breaker operation process, wherein the just-opening point refers to the moment when the mechanical contacts of the circuit breaker begin to separate, and the just-closing point refers to the moment when the mechanical contacts begin to close. Obtaining these points based on the corrected output signal output by the nonlinear correction model can improve the accuracy of determining the just-opening and just-closing points. Since the corrected output signal has taken into account environmental factors and the nonlinear characteristics of the signal, it can more accurately determine when the contacts actually begin to separate or close compared to the uncorrected signal.

[0053] S106: Obtain a relational expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact, and obtain a dielectric strength drop rate curve of the circuit breaker according to the corrected just-opening and just-closing points and the relational expression.

[0054] Optionally, the closing phase angle refers to the phase angle of the power supply voltage at the moment the circuit breaker is closed, which has an important impact on the electrical performance of the circuit breaker. The number of mechanical contact openings reflects the frequency of use of the circuit breaker. By obtaining the relationship expression between the closing phase angle of the circuit breaker and the number of mechanical contact openings, combined with the correction of the just-opened and just-closed points, the insulation strength reduction rate curve of the circuit breaker can be calculated. Among them, the insulation strength reduction rate curve can intuitively reflect the trend of insulation performance degradation as the number of circuit breaker operations increases and the influence of factors such as the closing phase angle increases.

[0055] S108: Determine a closing interval based on the insulation strength reduction rate curve, and control a closing process of the circuit breaker according to the closing interval.

[0056] Optionally, the closing interval is determined according to the insulation strength reduction rate curve. By controlling the circuit breaker to close within the closing interval, the service life of the circuit breaker can be effectively extended and the probability of insulation failure can be reduced.

[0057] In the above-mentioned circuit breaker closing control method, by establishing a nonlinear correction model, and obtaining the corrected just-opening and just-closing points of the circuit breaker according to the correction output signal output by the nonlinear correction model, the critical time point of the circuit breaker action can be determined more accurately, thereby providing a more accurate time reference for the closing control, avoiding inaccurate closing time due to signal error, and improving the accuracy of closing time prediction. In addition, by determining the closing interval according to the insulation strength reduction rate curve to control the closing process, the circuit breaker can be closed in a state where the insulation performance is relatively stable, reducing the loss of insulation materials, and reducing the insulation strength reduction rate, thereby extending the service life of the circuit breaker.

[0058] In an exemplary embodiment, the step of obtaining a relationship expression between a closing phase angle of a circuit breaker and the number of opening and closing times of a mechanical contact includes: establishing a physical model of the circuit breaker; in the process of simulating the opening and closing of the circuit breaker through the physical model, obtaining a closing breakdown voltage curve of the circuit breaker according to the changing state of the electric field strength and the medium density of the airflow field; performing multiple opening and closing tests on the circuit breaker to obtain a closing test curve of the circuit breaker; and comparing and analyzing the closing breakdown voltage curve and the closing test curve to obtain a relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact.

[0059] Optionally, since various complex physical phenomena may occur in the circuit breaker under frequent operation, such as arc contact ablation, surface changes, and changes in electric field distribution, it is first necessary to establish a physical model that can simulate the actual working state of the circuit breaker. The physical model contains key structural components of the circuit breaker, such as arc contacts, nozzles, etc. Using the established physical model, the changing state of the electric field strength and the density of the gas flow field medium is obtained in the process of simulating the circuit breaker opening and closing. When the closing surge current causes problems such as arc contact ablation, the electric field strength will change, and the density of the gas flow field medium will also be affected. Specifically, according to the theoretical breakdown criterion of SF6 gas injection, combined with the dynamic changes of the electric field strength and the medium density simulated in the physical model, the closing breakdown voltage curve can be calculated. Among them, the closing breakdown voltage curve can reflect the voltage condition of the breakdown when the circuit breaker is closed under different physical conditions.

[0060] Furthermore, in order to more accurately understand the actual performance of the circuit breaker, it is necessary to conduct multiple breaking tests on the circuit breaker. During the test, the closing test curve of the circuit breaker can be obtained through actual measurement. These test data can truly reflect the closing situation of the circuit breaker in actual operation, including changes in parameters such as closing voltage and closing time. Unlike simulation calculations, test data takes into account the comprehensive influence of factors such as manufacturing process, material properties and external environment of the actual circuit breaker.

[0061] Furthermore, the closing breakdown voltage curve obtained by simulation calculation and the closing test curve obtained by experiment are compared and analyzed. By comparing the differences and similarities between the two curves, the correlation between the closing phase angle and the number of mechanical contact openings can be found.

[0062] In this embodiment, by calculating the closing breakdown voltage curve of the circuit breaker and combining it with the closing test curve obtained by the breaking test, the relationship expression between the closing phase angle of the circuit breaker and the number of breaking times of the mechanical contact is obtained, and the correlation between the closing phase angle and the number of breaking times can be accurately determined, thereby accurately controlling the closing process of the circuit breaker and effectively avoiding breakdown accidents caused by the closing operation.

[0063] In an exemplary embodiment, the step of obtaining the insulation strength decrease rate curve of the circuit breaker according to the corrected rigid-opening and rigid-closing points and the relationship expression includes: obtaining the critical breakdown field strength and breakdown voltage value of the circuit breaker according to the corrected rigid-opening and rigid-closing points and the relationship expression; obtaining the pre-breakdown voltage curve according to the critical breakdown field strength and the breakdown voltage value, and determining the breakdown gap according to the pre-breakdown voltage curve; performing nonlinear fitting on the breakdown voltage value and the breakdown gap to obtain a fitting relationship expression between the breakdown voltage value and the breakdown gap; determining the derivative of the breakdown voltage value with respect to time, and obtaining the insulation strength decrease rate curve of the circuit breaker according to the derivative and the fitting relationship expression.

[0064] Optionally, based on the correction of the rigid-opening and rigid-closing points and the relationship expression, the critical breakdown field strength and breakdown voltage value of the circuit breaker can be obtained. The critical breakdown field strength and breakdown voltage values ​​are key parameters when the circuit breaker breaks down under specific conditions (such as gap distance, electric field strength, etc.). According to the critical breakdown field strength and breakdown voltage value, a pre-breakdown voltage curve can be drawn. The pre-breakdown voltage curve refers to the voltage change before the circuit breaker breaks down at different gap distances. By analyzing the pre-breakdown voltage curve, the breakdown gap, that is, the gap distance when the breakdown occurs, can be determined. Furthermore, by performing nonlinear fitting on the breakdown voltage value and the breakdown gap, a fitting relationship expression between the breakdown voltage value and the breakdown gap can be obtained. Combining the fitting relationship expression and the derivative of the breakdown voltage value with respect to time, the insulation strength drop rate curve of the circuit breaker can be derived.

[0065] For example, due to the shape characteristics of the mechanical contact of the circuit breaker, it is a slightly non-uniform electric field. The breakdown voltage of the SF6 gas medium is calculated according to the streamer theory, and the expression of the critical breakdown field strength and voltage value is calculated as follows:

[0066]

[0067] in, is the conductor medium density; is the critical breakdown field strength value; is the dielectric breakdown voltage value; is the electric field distribution value when the voltage between the contacts is 1V. When the arc gap is broken down, the arc gap may be broken down. Since the closing process of the circuit breaker pays more attention to the dielectric insulation strength within the short opening distance range, the curve of the breakdown voltage value within the short opening distance during the closing process (i.e., the pre-breakdown voltage curve) can be obtained, such as Figure 2 As shown, the curve takes the closing moment as the time origin.

[0068] Furthermore, during the closing process of the circuit breaker, when the contact spacing is less than a certain critical value and cannot withstand the external voltage, pre-breakdown will occur. Assuming that the distance between the moving contact and the static contact of the circuit breaker at the pre-breakdown point is x(t), and the corresponding breakdown field strength between the contacts is E, then the breakdown voltage u j (t) can be expressed as:

[0069]

[0070] Furthermore, it is generally believed that during the closing operation of the circuit breaker, the closing speed does not change much relative to the change in the electric field strength, and is approximately a constant value. The corresponding average breakdown field strength E of the contact gap can be regarded as a constant, so the breakdown voltage u j The derivative of (t) with respect to time is:

[0071]

[0072] Therefore, the relationship between the pre-breakdown voltage and time, that is, the closing insulation characteristic, can be simplified to a straight line, the absolute value of its slope is the dielectric strength decrease rate (RDDS) of the contact gap, expressed as:

[0073]

[0074] Furthermore, the applied voltage u(t) is expressed as:

[0075]

[0076] Among them, Um is the maximum value of the external applied voltage.

[0077] Taking the derivative of time t, we can get the maximum slope k of the voltage sine wave m (i.e., voltage zero point) is expressed as:

[0078]

[0079] Furthermore, the variable k is defined as the closing coefficient, which expresses the relationship between the voltage change in the main circuit and the breakdown voltage of the arc extinguishing chamber during the closing process. Then k is expressed as:

[0080]

[0081] Where v is the moving speed of the mechanical contact.

[0082] Furthermore, the relationship between the breakdown voltage and the breakdown gap is obtained through nonlinear fitting:

[0083]

[0084] Among them, p and q are unknown parameters obtained from experimental data.

[0085] Furthermore, the dielectric strength decrease rate can be expressed as:

[0086]

[0087] Among them, through multiple tests, the change relationship of the closing phase with the increase of the number of actions can be obtained, and the change relationship of the unknown coefficient p with the number of breaking times n can be obtained as follows:

[0088]

[0089] Among them, p0 is the value when the contact is ablated, p n is the coefficient of change of p as the number of actions increases.

[0090] In this embodiment, by obtaining the insulation strength drop rate curve of the circuit breaker, the insulation performance of the circuit breaker under different conditions can be more accurately evaluated, thereby accurately predicting the closing time of the circuit breaker and ensuring the safe and stable operation of the power system.

[0091] In an exemplary embodiment, the step of determining the closing interval based on the insulation strength decrease rate curve includes: obtaining a tangent curve between the insulation strength decrease rate curve and the externally applied voltage curve; the externally applied voltage curve is distributed in a coordinate system with time as the horizontal axis and voltage value as the vertical axis; the intersection of the tangent curve and the horizontal axis is used as the first boundary of the closing interval; the tangent curve is adjusted according to a preset offset, and the intersection of the adjusted tangent curve and the horizontal axis is used as the second boundary of the closing interval.

[0092] For example, the schematic diagram of the closing interval is as follows: Figure 3 As shown, by obtaining the tangent point of the insulation strength drop rate curve and the external voltage, the tangent curve is obtained, and the intersection of the tangent curve and the time axis t is used as the left boundary of the closing window (i.e., the first boundary), and then the tangent curve is translated to the right to obtain the right boundary of the closing window (i.e., the second boundary), so as to obtain the closing interval. Through the closing interval, the time of issuing the closing command can be accurately determined according to the actual operating state of the circuit breaker. Among them, Figure 3 In the simplified RDDS curve, the applied voltage is a sine wave curve, and the tangent curve can be understood as a parallel line of RDDS, i.e. A', and the tangent point is , the corresponding horizontal axis is , the intersection point of the tangent curve and the horizontal axis is , the corresponding horizontal axis is , the curve obtained by adjusting the tangent curve according to the preset offset is B', and its intersection with the horizontal axis is , the corresponding horizontal axis is , then the closing interval is [ , ] Among them, point A is the intersection of the tangent curve and the applied voltage, point B is the intersection of the moved tangent curve and the applied voltage, point C is the intersection of the RDDS curve and the applied voltage, and the corresponding horizontal coordinate is , the intersection of the RDDS curve and the horizontal axis is , the corresponding horizontal axis is The preset offset may be determined according to the positional relationship between the RDDS curve and the tangent curve.

[0093] Specifically, as the number of breaking times increases, the change in contact spacing is expressed as:

[0094]

[0095] Among them, x is the rated opening distance of the initial circuit breaker when it leaves the factory, x0 is the coefficient of change of the opening distance as the number of operations increases, and n is the number of breaking times.

[0096] Furthermore, the change of the insulation strength reduction rate curve is expressed as:

[0097]

[0098] In this embodiment, by obtaining the tangent curve between the insulation strength reduction rate curve and the external applied voltage curve, the intersection of the tangent curve and the horizontal axis is used as the first boundary of the closing interval, and the tangent curve is adjusted according to a preset offset. The intersection of the adjusted tangent curve and the horizontal axis is used as the second boundary of the closing interval. The closing interval of the circuit breaker can be accurately determined, thereby accurately controlling the closing operation of the circuit breaker and ensuring the stable operation of the power system.

[0099] In an exemplary embodiment, the closing process of the circuit breaker is controlled according to the closing interval, including: obtaining the change state of the closing interval according to the insulation strength reduction rate curve; and determining the triggering time of the closing instruction according to the changing state, so that the circuit breaker performs the closing operation according to the triggering time.

[0100] Optionally, as the number of disconnections increases, the contact spacing will change, which will cause the insulation strength decrease rate to change accordingly. The insulation strength decrease rate curve reflects this change. By analyzing the insulation strength decrease rate curve, the changes in the closing interval can be obtained in real time, thereby determining the triggering time of the closing command based on the changes.

[0101] In this embodiment, by obtaining the change state of the closing interval according to the insulation strength decrease rate curve, and determining the triggering time of the closing command according to the change state, the closing time of the circuit breaker can be accurately controlled, thereby ensuring that the circuit breaker is closed when the insulation performance is relatively stable, reducing the insulation strength decrease rate.

[0102] In an exemplary embodiment, the method further includes: updating the nonlinear correction model by using a genetic algorithm, and re-obtaining the correction rigid-opening and rigid-closing points of the circuit breaker based on the updated nonlinear correction model.

[0103] Optionally, in order to improve the prediction accuracy of the nonlinear correction model, the neural network can be trained to approximate the real data distribution and effectively predict and correct the nonlinear data. This training can help overcome the limitations of traditional linear models and better adapt to complex nonlinear problems in practical applications. By introducing genetic algorithms, the generalization efficiency of the model can be improved.

[0104] For example, in a genetic algorithm, a population is composed of multiple individuals, each of which represents a set of weights and thresholds of a neural network. Therefore, a certain number of individuals need to be randomly initialized to form an initial population, and a fitness function is used to evaluate the performance of each individual, that is, the prediction error of the neural network. Generally, the smaller the prediction error, the higher the fitness of the individual. Therefore, the inverse of the prediction error or other related indicators can be used as the fitness function F i , whose expression is:

[0105]

[0106] in, , is the actual output and expected output of the kth neuron of the ith individual.

[0107] Furthermore, according to the fitness function, the tournament method is used to select individuals with higher fitness in the population as the father of the next generation. The mathematical expression of the selection process is:

[0108]

[0109] Among them, L i represents the selection probability of the ith individual, N is the population size, and k is the tournament size.

[0110] Furthermore, in the neural network, the weights and thresholds of the parents can be crossed to generate new weight and threshold combinations, and the mutation operation can be achieved by making small random perturbations to the weights and thresholds. After that, the newly generated individuals are added to the population to replace some of the original individuals to form a new population. This process can be iterated continuously until the preset termination conditions, such as the number of iterations, fitness threshold, etc., are reached.

[0111] Furthermore, the neural network is trained using weights and thresholds optimized by genetic algorithms. During the training process, the parameters of the neural network are fine-tuned using methods such as gradient descent to further improve the performance of the neural network.

[0112] In this embodiment, the nonlinear model is updated by a genetic algorithm, which can improve the prediction accuracy of the model, thereby obtaining a more accurate closing interval and ensuring stable closing of the circuit breaker.

[0113] In an exemplary embodiment, Figure 4 As shown, a circuit breaker closing control method is provided, the method comprising the following steps:

[0114] A nonlinear correction model is established; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening of the mechanical contact, and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch.

[0115] According to the correction output signal output by the nonlinear correction model, the correction rigid opening and closing points of the circuit breaker are obtained.

[0116] A physical model of the circuit breaker is established; in the process of simulating the opening and closing of the circuit breaker through the physical model, the closing breakdown voltage curve of the circuit breaker is obtained according to the changing state of the electric field strength and the medium density of the airflow field; multiple opening and closing tests are carried out on the circuit breaker to obtain the closing test curve of the circuit breaker; the closing breakdown voltage curve and the closing test curve are compared and analyzed to obtain the relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contacts.

[0117] According to the corrected rigid-opening and rigid-closing points and the relationship expression, the critical breakdown field strength and breakdown voltage value of the circuit breaker are obtained; according to the critical breakdown field strength and the breakdown voltage value, the pre-breakdown voltage curve is obtained, and the breakdown gap is determined according to the pre-breakdown voltage curve; the breakdown voltage value and the breakdown gap are nonlinearly fitted to obtain the fitting relationship expression between the breakdown voltage value and the breakdown gap; the derivative of the breakdown voltage value with respect to time is determined, and according to the derivative and the fitting relationship expression, the insulation strength reduction rate curve of the circuit breaker is obtained.

[0118] Obtain a tangent curve between the insulation strength reduction rate curve and the externally applied voltage curve; the externally applied voltage curve is distributed in a coordinate system with time as the horizontal axis and voltage value as the vertical axis; the intersection of the tangent curve and the horizontal axis is used as the first boundary of the closing interval; adjust the tangent curve according to a preset offset, and use the intersection of the adjusted tangent curve and the horizontal axis as the second boundary of the closing interval.

[0119] According to the insulation strength drop rate curve, the change state of the closing interval is obtained; according to the change state, the triggering time of the closing instruction is determined so that the circuit breaker performs the closing operation according to the triggering time.

[0120] The nonlinear correction model is updated by genetic algorithm, and the correction rigid opening and closing points of the circuit breaker are re-obtained based on the updated nonlinear correction model.

[0121] In this embodiment, by establishing a nonlinear correction model, and obtaining the corrected just-opening and just-closing points of the circuit breaker according to the corrected output signal output by the nonlinear correction model, the critical time point of the circuit breaker action can be determined more accurately, thereby providing a more accurate time reference for the closing control, avoiding inaccurate closing time due to signal error, and improving the accuracy of closing time prediction. In addition, by determining the closing interval according to the insulation strength reduction rate curve to control the closing process, the circuit breaker can be closed in a state where the insulation performance is relatively stable, reducing the loss of insulation materials, and reducing the insulation strength reduction rate, thereby extending the service life of the circuit breaker.

[0122] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0123] Based on the same inventive concept, the embodiment of the present application also provides a circuit breaker closing control device for implementing the circuit breaker closing control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations of one or more circuit breaker closing control device embodiments provided below can refer to the limitations of the circuit breaker closing control method above, and will not be repeated here.

[0124] In an exemplary embodiment, Figure 5 As shown, a circuit breaker closing control device is provided, comprising: a model correction module 10, a correction point acquisition module 20, a drop rate acquisition module 30 and a closing control module 40, wherein:

[0125] The model correction module 10 is used to establish a nonlinear correction model; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening and closing of the mechanical contact, and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch.

[0126] The correction point acquisition module 20 is used to obtain the correction rigid opening and closing points of the circuit breaker according to the correction output signal output by the nonlinear correction model.

[0127] The drop rate acquisition module 30 is used to obtain the relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact, and obtain the insulation strength drop rate curve of the circuit breaker according to the corrected just-opening and just-closing points and the relationship expression.

[0128] The closing control module 40 is used to determine the closing interval based on the insulation strength reduction rate curve, and control the closing process of the circuit breaker according to the closing interval.

[0129] In an exemplary embodiment, the drop rate acquisition module 30 is also used to establish a physical model of the circuit breaker; in the process of simulating the opening and closing of the circuit breaker through the physical model, the closing breakdown voltage curve of the circuit breaker is obtained according to the changing state of the electric field strength and the medium density of the airflow field; the circuit breaker is subjected to multiple opening and closing tests to obtain the closing test curve of the circuit breaker; the closing breakdown voltage curve and the closing test curve are compared and analyzed to obtain the relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contacts.

[0130] In an exemplary embodiment, the degradation rate acquisition module 30 is also used to obtain the critical breakdown field strength and breakdown voltage value of the circuit breaker based on the corrected rigid-opening and rigid-closing points and the relationship expression; obtain the pre-breakdown voltage curve based on the critical breakdown field strength and the breakdown voltage value, and determine the breakdown gap based on the pre-breakdown voltage curve; perform nonlinear fitting on the breakdown voltage value and the breakdown gap to obtain a fitting relationship expression between the breakdown voltage value and the breakdown gap; determine the derivative of the breakdown voltage value with respect to time, and obtain the insulation strength degradation rate curve of the circuit breaker based on the derivative and the fitting relationship expression.

[0131] In an exemplary embodiment, the closing control module 40 is also used to obtain a tangent curve between the insulation strength drop rate curve and the externally applied voltage curve; the externally applied voltage curve is distributed in a coordinate system with time as the horizontal axis and voltage value as the vertical axis; the intersection of the tangent curve and the horizontal axis is used as the first boundary of the closing interval; the tangent curve is adjusted according to a preset offset, and the intersection of the adjusted tangent curve and the horizontal axis is used as the second boundary of the closing interval.

[0132] In an exemplary embodiment, the closing control module 40 is also used to obtain the change state of the closing interval according to the insulation strength reduction rate curve; and determine the triggering time of the closing instruction according to the change state, so that the circuit breaker performs the closing operation according to the triggering time.

[0133] In an exemplary embodiment, the closing control module 40 is further configured to update the nonlinear correction model by using a genetic algorithm, and re-acquire the corrected opening and closing points of the circuit breaker based on the updated nonlinear correction model.

[0134] Each module in the above circuit breaker closing control device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0135] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 6 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a circuit breaker closing control method is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0136] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0137] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the following steps when executing the computer program: establishing a nonlinear correction model; the input of the nonlinear correction model is an output signal generated by an auxiliary switch in response to the opening and closing of a mechanical contact, and an environmental parameter signal collected by an environmental parameter sensor; the output of the nonlinear correction model is a correction output signal of the auxiliary switch; according to the correction output signal output by the nonlinear correction model, a correction just-opening and just-closing point of the circuit breaker is obtained; a relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact is obtained, and according to the correction just-opening and just-closing point and the relationship expression, an insulation strength reduction rate curve of the circuit breaker is obtained; a closing interval is determined based on the insulation strength reduction rate curve, and the closing process of the circuit breaker is controlled according to the closing interval.

[0138] In one embodiment, the method of obtaining a relationship expression between a closing phase angle of a circuit breaker and the number of opening and closing times of a mechanical contact involved in executing a computer program by a processor includes: establishing a physical model of the circuit breaker; in the process of simulating the opening and closing of the circuit breaker through the physical model, obtaining a closing breakdown voltage curve of the circuit breaker according to the changing state of the electric field strength and the medium density of the airflow field; performing multiple opening and closing tests on the circuit breaker to obtain a closing test curve of the circuit breaker; and comparing and analyzing the closing breakdown voltage curve and the closing test curve to obtain a relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact.

[0139] In one embodiment, the method involved in executing a computer program by a processor includes obtaining an insulation strength reduction rate curve of a circuit breaker according to a corrected rigid-opening and rigid-closing point and a relationship expression, including: obtaining a critical breakdown field strength and a breakdown voltage value of the circuit breaker according to the corrected rigid-opening and rigid-closing point and a relationship expression; obtaining a pre-breakdown voltage curve according to the critical breakdown field strength and the breakdown voltage value, and determining a breakdown gap according to the pre-breakdown voltage curve; performing nonlinear fitting on the breakdown voltage value and the breakdown gap to obtain a fitting relationship expression between the breakdown voltage value and the breakdown gap; determining a derivative of the breakdown voltage value with respect to time, and obtaining an insulation strength reduction rate curve of the circuit breaker according to the derivative and the fitting relationship expression.

[0140] In one embodiment, the method of determining a closing interval based on an insulation strength decrease rate curve involved in executing a computer program by a processor includes: obtaining a tangent curve between the insulation strength decrease rate curve and an externally applied voltage curve; distributing the externally applied voltage curve in a coordinate system with time as the horizontal axis and voltage value as the vertical axis; taking the intersection of the tangent curve and the horizontal axis as the first boundary of the closing interval; adjusting the tangent curve according to a preset offset, and taking the intersection of the adjusted tangent curve and the horizontal axis as the second boundary of the closing interval.

[0141] In one embodiment, the closing process of controlling the circuit breaker according to the closing interval involved in the execution of the computer program by the processor includes: obtaining the change state of the closing interval according to the insulation strength decrease rate curve; and determining the triggering time of the closing instruction according to the changing state, so that the circuit breaker performs the closing operation according to the triggering time.

[0142] In one embodiment, when the processor executes the computer program, the following steps are further implemented: updating the nonlinear correction model by means of a genetic algorithm, and re-obtaining the correction rigid-opening and rigid-closing points of the circuit breaker based on the updated nonlinear correction model.

[0143] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented: a nonlinear correction model is established; the input of the nonlinear correction model is an output signal generated by the auxiliary switch in response to the opening and closing of a mechanical contact, and an environmental parameter signal collected by an environmental parameter sensor; the output of the nonlinear correction model is a correction output signal of the auxiliary switch; according to the correction output signal output by the nonlinear correction model, a correction just-opening and just-closing point of the circuit breaker is obtained; a relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact is obtained, and according to the correction just-opening and just-closing point and the relationship expression, an insulation strength reduction rate curve of the circuit breaker is obtained; a closing interval is determined based on the insulation strength reduction rate curve, and the closing process of the circuit breaker is controlled according to the closing interval.

[0144] In one embodiment, the method of obtaining a relationship expression between a closing phase angle of a circuit breaker and the number of opening and closing times of a mechanical contact when a computer program is executed by a processor includes: establishing a physical model of the circuit breaker; in the process of simulating the opening and closing of the circuit breaker by the physical model, obtaining a closing breakdown voltage curve of the circuit breaker according to the changing state of the electric field strength and the medium density of the airflow field; performing multiple opening and closing tests on the circuit breaker to obtain a closing test curve of the circuit breaker; and comparing and analyzing the closing breakdown voltage curve and the closing test curve to obtain a relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact.

[0145] In one embodiment, when a computer program is executed by a processor, the method involves obtaining an insulation strength reduction rate curve of a circuit breaker according to a corrected rigid-opening and rigid-closing point and a relationship expression, including: obtaining a critical breakdown field strength and a breakdown voltage value of the circuit breaker according to the corrected rigid-opening and rigid-closing point and a relationship expression; obtaining a pre-breakdown voltage curve according to the critical breakdown field strength and the breakdown voltage value, and determining a breakdown gap according to the pre-breakdown voltage curve; performing nonlinear fitting on the breakdown voltage value and the breakdown gap to obtain a fitting relationship expression between the breakdown voltage value and the breakdown gap; determining a derivative of the breakdown voltage value with respect to time, and obtaining an insulation strength reduction rate curve of the circuit breaker according to the derivative and the fitting relationship expression.

[0146] In one embodiment, when a computer program is executed by a processor, the method involved in determining a closing interval based on an insulation strength decrease rate curve includes: obtaining a tangent curve between the insulation strength decrease rate curve and an externally applied voltage curve; distributing the externally applied voltage curve in a coordinate system with time as the horizontal axis and voltage value as the vertical axis; using the intersection of the tangent curve and the horizontal axis as the first boundary of the closing interval; adjusting the tangent curve according to a preset offset, and using the intersection of the adjusted tangent curve and the horizontal axis as the second boundary of the closing interval.

[0147] In one embodiment, the computer program executed by the processor involves controlling the closing process of the circuit breaker according to the closing interval, including: obtaining the change state of the closing interval according to the insulation strength drop rate curve; determining the triggering time of the closing instruction according to the changing state, so that the circuit breaker performs the closing operation according to the triggering time.

[0148] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: updating the nonlinear correction model by means of a genetic algorithm, and re-obtaining the correction rigid-opening and rigid-closing points of the circuit breaker based on the updated nonlinear correction model.

[0149] In one embodiment, a computer program product is provided, including a computer program, which implements the following steps when executed by a processor: establishing a nonlinear correction model; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening and closing of the mechanical contact, and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch; according to the correction output signal output by the nonlinear correction model, the correction opening and closing points of the circuit breaker are obtained; the relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact is obtained, and the insulation strength reduction rate curve of the circuit breaker is obtained according to the correction opening and closing points and the relationship expression; the closing interval is determined based on the insulation strength reduction rate curve, and the closing process of the circuit breaker is controlled according to the closing interval.

[0150] In one embodiment, the method of obtaining a relationship expression between a closing phase angle of a circuit breaker and the number of opening and closing times of a mechanical contact when a computer program is executed by a processor includes: establishing a physical model of the circuit breaker; in the process of simulating the opening and closing of the circuit breaker by the physical model, obtaining a closing breakdown voltage curve of the circuit breaker according to the changing state of the electric field strength and the medium density of the airflow field; performing multiple opening and closing tests on the circuit breaker to obtain a closing test curve of the circuit breaker; and comparing and analyzing the closing breakdown voltage curve and the closing test curve to obtain a relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact.

[0151] In one embodiment, when a computer program is executed by a processor, the method involves obtaining an insulation strength reduction rate curve of a circuit breaker according to a corrected rigid-opening and rigid-closing point and a relationship expression, including: obtaining a critical breakdown field strength and a breakdown voltage value of the circuit breaker according to the corrected rigid-opening and rigid-closing point and a relationship expression; obtaining a pre-breakdown voltage curve according to the critical breakdown field strength and the breakdown voltage value, and determining a breakdown gap according to the pre-breakdown voltage curve; performing nonlinear fitting on the breakdown voltage value and the breakdown gap to obtain a fitting relationship expression between the breakdown voltage value and the breakdown gap; determining a derivative of the breakdown voltage value with respect to time, and obtaining an insulation strength reduction rate curve of the circuit breaker according to the derivative and the fitting relationship expression.

[0152] In one embodiment, when a computer program is executed by a processor, the method involved in determining a closing interval based on an insulation strength decrease rate curve includes: obtaining a tangent curve between the insulation strength decrease rate curve and an externally applied voltage curve; distributing the externally applied voltage curve in a coordinate system with time as the horizontal axis and voltage value as the vertical axis; using the intersection of the tangent curve and the horizontal axis as the first boundary of the closing interval; adjusting the tangent curve according to a preset offset, and using the intersection of the adjusted tangent curve and the horizontal axis as the second boundary of the closing interval.

[0153] In one embodiment, the computer program executed by the processor involves controlling the closing process of the circuit breaker according to the closing interval, including: obtaining the change state of the closing interval according to the insulation strength drop rate curve; determining the triggering time of the closing instruction according to the changing state, so that the circuit breaker performs the closing operation according to the triggering time.

[0154] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: updating the nonlinear correction model by means of a genetic algorithm, and re-obtaining the correction rigid-opening and rigid-closing points of the circuit breaker based on the updated nonlinear correction model.

[0155] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0156] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0157] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A circuit breaker closing control method, characterized in that: Applied to a circuit breaker; the circuit breaker includes a mechanical contact, an auxiliary switch and an environmental parameter sensor; the method includes: Establishing a nonlinear correction model; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening of the mechanical contact and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch; According to the correction output signal output by the nonlinear correction model, obtaining the correction rigid opening and closing points of the circuit breaker; Obtaining a relational expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact, and obtaining a dielectric strength drop rate curve of the circuit breaker according to the corrected just-opening and just-closing points and the relational expression; A closing interval is determined based on the insulation strength decrease rate curve, and a closing process of the circuit breaker is controlled according to the closing interval.

2. The method according to claim 1, characterized in that: The step of obtaining a relationship expression between the closing phase angle of the circuit breaker and the number of times the mechanical contact is opened and closed comprises: Establishing a physical model of the circuit breaker; In the process of simulating the opening of the circuit breaker by the physical model, the closing breakdown voltage curve of the circuit breaker is obtained according to the change state of the electric field intensity and the medium density of the air flow field; Perform multiple breaking tests on the circuit breaker to obtain a closing test curve of the circuit breaker; The closing breakdown voltage curve and the closing test curve are compared and analyzed to obtain a relationship expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact.

3. The method according to claim 1, characterized in that The step of obtaining the insulation strength drop rate curve of the circuit breaker according to the corrected just-open and just-close points and the relational expression comprises: According to the corrected rigid-opening and rigid-closing points and the relational expression, a critical breakdown field strength and a breakdown voltage value of the circuit breaker are obtained; Acquire a pre-breakdown voltage curve according to the critical breakdown field strength and the breakdown voltage value, and determine a breakdown gap according to the pre-breakdown voltage curve; Performing nonlinear fitting on the breakdown voltage value and the breakdown gap to obtain a fitting relationship expression between the breakdown voltage value and the breakdown gap; The derivative of the breakdown voltage value with respect to time is determined, and the insulation strength drop rate curve of the circuit breaker is obtained according to the derivative and the fitting relationship expression.

4. The method according to claim 1, characterized in that The determining of the closing interval based on the insulation strength decrease rate curve comprises: Obtaining a tangent curve between the insulation strength reduction rate curve and the externally applied voltage curve; the externally applied voltage curve is distributed in a coordinate system with time as the horizontal axis and voltage value as the vertical axis; Taking the intersection of the tangent curve and the horizontal axis as the first boundary of the closing interval; The tangent curve is adjusted according to a preset offset, and an intersection point between the adjusted tangent curve and the horizontal axis is used as a second boundary of the closing interval.

5. The method according to claim 1, characterized in that The process of controlling the closing of the circuit breaker according to the closing interval includes: According to the insulation strength decrease rate curve, obtaining a change state of the closing interval; According to the change state, the triggering moment of the closing instruction is determined so that the circuit breaker performs the closing operation according to the triggering moment.

6. The method according to claim 1, characterized in that The method further comprises: The nonlinear correction model is updated by a genetic algorithm, and based on the updated nonlinear correction model, the correction rigid opening and closing points of the circuit breaker are re-obtained.

7. A circuit breaker closing control device, characterized in that: The device comprises: A model correction module is used to establish a nonlinear correction model; the input of the nonlinear correction model is the output signal generated by the auxiliary switch in response to the opening and closing of the mechanical contact, and the environmental parameter signal collected by the environmental parameter sensor; the output of the nonlinear correction model is the correction output signal of the auxiliary switch; A correction point acquisition module, used for acquiring a correction rigid opening and closing point of the circuit breaker according to a correction output signal output by the nonlinear correction model; A drop rate acquisition module, used to obtain a relational expression between the closing phase angle of the circuit breaker and the number of opening and closing times of the mechanical contact, and to obtain a dielectric strength drop rate curve of the circuit breaker according to the corrected just-opening and just-closing points and the relational expression; A closing control module is used to determine a closing interval based on the insulation strength reduction rate curve, and control the closing process of the circuit breaker according to the closing interval.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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