Abnormal result determination method and device of magnetic control circuit breaker and electronic equipment

Abstract

The invention discloses a method and a device for determining an abnormal result of a magnetically controlled circuit breaker, and electronic equipment. The method comprises the following steps: acquiring a magnetically controlled circuit breaker; processing frequency alternating current is controlled to be applied to a magnet exciting coil of the magnetic control circuit breaker, and target reactance corresponding to the magnet exciting coil is obtained; according to the target reactance and the first association relationship, determining a first change parameter of the closing retention force of the magnetically controlled circuit breaker; variable direct current is controlled to be applied to the magnet exciting coil, corresponding characteristic values of the magnet exciting coil under characteristic items are obtained, and the characteristic items comprise at least one of a magnet exciting coil current item and a magnet exciting coil inductance item; determining a second change parameter of the closing retention force of the magnetically controlled circuit breaker according to the characteristic value and a second association relationship; and determining an abnormal result of the magnetically controlled circuit breaker according to the first change parameter and the second change parameter of the closing retention force. According to the invention, the technical problem that whether the magnetically controlled circuit breaker is abnormal or not is difficult to determine conveniently and quickly in related technologies is solved.

Description

Technical Field

[0001] This invention relates to the field of anomaly detection, and more specifically, to a method, apparatus, and electronic device for determining anomalies in a magnetically controlled circuit breaker. Background Technology

[0002] Since the primary and secondary integrated magnetic circuit breakers are mostly located on important power supply lines in urban areas and long overhead lines in suburban areas, the number of users experiencing power outages after abnormal tripping is large and the outage time is long, which affects the safe and reliable operation of the power distribution network and hinders the promotion and application of magnetic circuit breakers.

[0003] Currently, there is no effective means to detect abnormal tripping caused by internal defects in magnetically controlled circuit breakers in advance. Existing detection methods for switches mainly rely on infrared thermal imaging, ultrasonic and acoustic imaging. These methods cannot effectively reflect various mechanical defects within the circuit breaker and cannot provide effective early warnings for abnormal tripping. Therefore, there is an urgent need for a state-sensing and early warning technology to address the operational stability issues of magnetically controlled circuit breakers and improve their operational reliability.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This invention provides a method, apparatus, and electronic device for determining abnormal results of a magnetically controlled circuit breaker, thereby at least solving the technical problem in the related art of the difficulty in conveniently and quickly determining whether a magnetically controlled circuit breaker is abnormal.

[0006] According to one aspect of the present invention, a method for determining abnormal results of a magnetically controlled circuit breaker is provided, comprising: acquiring a magnetically controlled circuit breaker, wherein the magnetically controlled circuit breaker includes a pole structure and a base structure, the pole structure being mounted above the base structure, the base structure including a magnetic control structure, the magnetic control structure including an iron core, a spring, and an excitation coil; controlling the application of a power frequency alternating current to the excitation coil of the magnetically controlled circuit breaker, acquiring a target reactance corresponding to the excitation coil; and determining a first variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the target reactance and a first correlation relationship, wherein the first correlation relationship represents... The correlation between the excitation coil reactance term and the closing holding force term; controlling the application of a varying DC current to the excitation coil to obtain the characteristic value of the excitation coil under the characteristic term, wherein the characteristic term includes at least one of the following: excitation coil current term, excitation coil inductance term. Based on the characteristic value and the second correlation, a second variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined, wherein the second correlation is used to represent the correlation between the excitation coil characteristic term and the closing holding force term; based on the first variation parameter and the second variation parameter of the closing holding force, the abnormal result of the magnetically controlled circuit breaker is determined.

[0007] Optionally, when the feature items include the excitation coil current and the excitation coil inductance, the second variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined based on the feature value and the second correlation relationship. This includes: acquiring the reference saturation current corresponding to the magnetically controlled circuit breaker; real-time acquisition of the current change curve and inductance change curve corresponding to the excitation coil; when the excitation coil current continues to increase and the excitation coil inductance value changes from a first change trend to a second change trend, determining the current saturation current value at the transition moment, wherein the first change trend is that the inductance increases with the current by a factor greater than a growth threshold, and the second change trend is that the inductance increases with the current by a factor less than the growth threshold; determining the displacement state of the magnetic saturation point based on the current saturation current and the reference saturation current; and determining the second variation parameter based on the displacement state.

[0008] Optionally, before determining the first variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the target reactance and the first correlation, the method further includes: determining a first relationship between the closing holding force term and a plurality of first parameter terms, wherein the plurality of first parameter terms include a residual holding force term, a vacuum permeability term, an effective cross-sectional area term of the iron core term, and a total magnetic reluctance term of the magnetic circuit, wherein the holding force corresponding to the residual holding force term is the force value after subtracting the component force from the closing holding force, and the component force includes the component force of the spring; determining a second relationship between the magnetic reluctance term and a plurality of second parameter terms, wherein the plurality of second parameter terms include an AC angular frequency term, an excitation coil turns term, and an excitation coil reactance term; and determining a first correlation based on the first relationship and the second relationship, wherein the first correlation indicates that the square of the excitation coil reactance term is positively correlated with the closing holding force term.

[0009] Optionally, before determining the second variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the characteristic value and the second correlation, the method further includes: determining the correlation corresponding to the magnetic control structure, wherein the correlation includes a first-stage correlation and a second-stage correlation, the first-stage correlation representing the positive correlation between magnetic field strength and magnetic induction intensity before magnetic field strength saturation, and the second-stage correlation representing the nonlinear correlation between magnetic field strength and magnetic induction intensity after magnetic field strength saturation; and determining the second correlation based on the correlation.

[0010] Optionally, after determining the abnormal result of the magnetically controlled circuit breaker based on the first and second variation parameters of the closing holding force, the method further includes: in the case that the abnormal result is abnormal, retrieving the flux loop function; inputting the input parameters corresponding to the flux loop function into the flux loop function to obtain the closing holding force value.

[0011] Optionally, determining the abnormal result of the magnetically controlled circuit breaker based on the first and second variation parameters of the closing holding force includes: when the first variation parameter includes a change in the closing holding force and the second variation parameter includes a magnetic saturation point displacement vector value, determining a first result of whether the change in the closing holding force exceeds a first threshold, the direction of movement of the magnetic saturation point displacement vector value, and a second result of whether the magnetic saturation point displacement vector value exceeds a second threshold; when the first result is that the change in the closing holding force exceeds the first threshold and the direction of movement is moving in the direction of increasing current, and the second result is that the magnetic saturation point displacement vector value exceeds the second threshold, determining the abnormal result as abnormal.

[0012] Optionally, controlling the application of a variable DC current to the excitation coil and obtaining the characteristic value of the excitation coil under the characteristic item includes: when the first variable parameter of the closing holding force exceeds a first threshold, controlling the application of a variable DC current to the excitation coil and obtaining the characteristic value of the excitation coil under the characteristic item.

[0013] According to one aspect of the present invention, an abnormal result determination device for a magnetically controlled circuit breaker is provided, comprising: an acquisition module for acquiring a magnetically controlled circuit breaker, wherein the magnetically controlled circuit breaker includes a pole structure and a base structure, the pole structure being mounted above the base structure, and the base structure including a magnetic control structure, the magnetic control structure including an iron core, a spring, and an excitation coil; a first control module for controlling the application of a power frequency alternating current to the excitation coil of the magnetically controlled circuit breaker and acquiring a target reactance corresponding to the excitation coil; and a first determination module for determining a first variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the target reactance and a first correlation relationship, wherein the first correlation relationship represents the excitation coil's closing holding force. The relationship between the magnetic coil reactance term and the closing holding force term; a second control module, used to control the application of a changing DC current to the excitation coil and obtain the characteristic value of the excitation coil under the characteristic term, wherein the characteristic term includes at least one of the following: excitation coil current term, excitation coil inductance term; a second determination module, used to determine the second changing parameter of the closing holding force of the magnetically controlled circuit breaker based on the characteristic value and the second relationship, wherein the second relationship is used to represent the relationship between the excitation coil characteristic term and the closing holding force term; a third determination module, used to determine the abnormal result of the magnetically controlled circuit breaker based on the first changing parameter and the second changing parameter of the closing holding force.

[0014] According to one aspect of the present invention, an electronic device is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the abnormal result determination method for a magnetically controlled circuit breaker as described in any of the preceding claims.

[0015] According to one aspect of the present invention, a computer-readable storage medium is provided, which, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the abnormal result determination method for a magnetically controlled circuit breaker as described above.

[0016] In this embodiment of the invention, a magnetically controlled circuit breaker is obtained, wherein the magnetically controlled circuit breaker includes a pole structure and a base structure, the pole structure is installed above the base structure, and the base structure includes a magnetic control structure, the magnetic control structure includes an iron core, a spring, and an excitation coil; a power frequency AC current is applied to the excitation coil of the magnetically controlled circuit breaker to obtain the target reactance corresponding to the excitation coil; based on the target reactance and a first correlation relationship, a first variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined, wherein the first correlation relationship represents the correlation between the excitation coil reactance term and the closing holding force term; a variable DC current is applied to the excitation coil to obtain the characteristic value corresponding to the excitation coil under the characteristic term, wherein the characteristic term includes at least one of the following: excitation coil current term, excitation coil inductance term; based on the characteristic value and a second correlation relationship, a second variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined, wherein the second correlation relationship is used to represent the correlation between the excitation coil characteristic term and the closing holding force term; based on the first variation parameter and the second variation parameter of the closing holding force, an abnormal result of the magnetically controlled circuit breaker is determined. This invention employs a detection method based on excitation coil characteristics. By applying power frequency AC current and varying DC current to the excitation coil of a magnetically controlled circuit breaker, the characteristic values ​​corresponding to the target reactance, current, inductance, and other characteristic items are obtained. Then, based on the correlation between excitation coil reactance and closing holding force, and between excitation coil characteristic items and closing holding force, the first and second varying parameters of the closing holding force are determined. Combining these two varying parameters for comprehensive judgment achieves the goal of early warning of abnormal tripping problems in magnetically controlled circuit breakers. This invention achieves the technical effect of quickly, conveniently, and accurately identifying abnormalities in magnetically controlled circuit breakers and avoiding power outages, thereby solving the technical problem in related technologies where it is difficult to conveniently and quickly determine whether a magnetically controlled circuit breaker is abnormal. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1This is a flowchart of a method for determining abnormal results of a magnetically controlled circuit breaker according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of a magnetically controlled circuit breaker used in an optional embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the operating mechanism and control circuit principle of the magnetically controlled circuit breaker applied in an optional embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the magnetically controlled circuit breaker operating linkage used in an optional embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the magnetic control structure for an optional implementation of the present invention;

[0023] Figure 6 This is another schematic diagram of the magnetic control structure applied in an optional embodiment of the present invention;

[0024] Figure 7 This is another schematic diagram of the magnetic control structure used in an optional embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of different magnetization states provided by optional embodiments of the present invention;

[0026] Figure 9 This is a schematic diagram of the force analysis for the closing action and the holding force analysis of the magnetic control mechanism provided in an optional embodiment of the present invention;

[0027] Figure 10 This is a schematic diagram of the equivalent magnetic circuit provided by an optional embodiment of the present invention;

[0028] Figure 11 This is a schematic diagram of the magnetic saturation characteristics provided by an optional embodiment of the present invention;

[0029] Figure 12 This is a structural block diagram of an abnormal result determination device for a magnetically controlled circuit breaker according to an embodiment of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Example 1

[0033] According to an embodiment of the present invention, an embodiment of a method for determining abnormal results of a magnetically controlled circuit breaker is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0034] Figure 1 This is a flowchart of a method for determining abnormal results of a magnetically controlled circuit breaker according to an embodiment of the present invention, such as... Figure 1 As shown, the method includes the following steps:

[0035] Step S102: Obtain a magnetically controlled circuit breaker, wherein the magnetically controlled circuit breaker includes a pole structure and a base structure, the pole structure is installed on top of the base structure, and the base structure includes a magnetic control structure, which includes an iron core, a spring and an excitation coil.

[0036] In step S102 of this application, a magnetically controlled circuit breaker with a specific structure is obtained. The circuit breaker includes an upper and lower pole structure and a base structure. The magnetic control structure inside the base structure consists of an iron core, a spring, and an excitation coil, thus clarifying the structural composition and core components of the object to be tested.

[0037] Among them, magnetically controlled circuit breakers are involved. Magnetically controlled circuit breakers are a type of switching equipment used in power distribution networks. 10kV pole-mounted magnetically controlled circuit breakers often adopt a three-phase independent pillar pole structure, which can realize the opening and closing control of the circuit. Abnormal opening of the circuit will affect the safe operation of the power distribution network.

[0038] This involves the pole structure, which is installed above the base structure of the magnetically controlled circuit breaker. It adopts an integrated casting molding process and integrates a vacuum interrupter, current sensor, and voltage sensor. It is a key part of the magnetically controlled circuit breaker to realize circuit switching and electrical quantity detection.

[0039] This involves the base structure, which serves as the basic support structure for the magnetically controlled circuit breaker. Inside, a magnetic control structure is installed to control the opening and closing actions, providing installation and protection space for the magnetic control structure.

[0040] This involves a magnetic control structure, which is located inside the base structure and is the core component for controlling the opening and closing of the magnetic circuit breaker. It mainly consists of an iron core, springs, and excitation coils, and achieves the opening and closing actions through the combination of electromagnetic force and mechanical force.

[0041] This involves the iron core, which is the core magnetic component of the magnetic control structure. It includes a moving iron core and a stationary iron core. When energized, it can generate an electromagnetic attraction force, which drives the moving iron core to move to achieve closing. It also has residual magnetism to maintain the closed state.

[0042] This involves springs, which are elastic components in the magnetic control structure, including opening springs and contact springs. When opening, they provide a reverse elastic force, which works in conjunction with the electromagnetic force to achieve the opening action. At the same time, when the circuit is closed, they form a balance with the magnetic holding force.

[0043] This involves the excitation coil, which is a conductive component in the magnetic control structure. When current is passed through it, it can generate a magnetic field, which in turn causes the iron core to generate electromagnetic force. It is one of the power sources for realizing the opening and closing actions of the magnetically controlled circuit breaker. Its electrical characteristics (such as reactance and current) can reflect the state of the magnetic control structure.

[0044] This step clarifies the structural composition of the magnetically controlled circuit breaker and the location and function of each core component (such as the excitation coil and iron core), laying the foundation for subsequent operations such as current application and feature detection of the excitation coil of the magnetically controlled structure. It avoids deviations in the detection operation due to unclear understanding of the structure of the object being tested and ensures the orderly conduct of subsequent testing steps.

[0045] Step S104: Control the application of power frequency AC current to the excitation coil of the magnetically controlled circuit breaker to obtain the target reactance corresponding to the excitation coil;

[0046] In step S104 provided in this application, a power frequency AC current is applied to the excitation coil of the magnetically controlled circuit breaker by a control device, and the target reactance of the excitation coil under the action of the current is measured and obtained by a detection device.

[0047] This involves power frequency alternating current, which is an alternating current with a frequency of 50Hz (industrial standard frequency). It has the characteristics of good stability and compliance with industrial power standards, and can be used for electrical characteristic detection of electrical equipment.

[0048] This involves the target reactance, which is the measured value of the resistance of the excitation coil to the AC current after applying a power frequency AC current to the excitation coil. It reflects the inductance characteristics and magnetic circuit state of the excitation coil and is a key electrical parameter for judging the performance of the magnetic control structure.

[0049] This step utilizes a power frequency AC current that meets the general requirements of industrial testing scenarios, exhibits high stability, and can accurately excite the reactance characteristics of the excitation coil. The obtained target reactance provides a direct and measurable electrical parameter for the closing and holding force in subsequent steps, avoiding the complexity of directly measuring the closing and holding force (which requires disassembling the equipment). This enables indirect, non-invasive testing of the core performance of the magnetically controlled structure, meeting the requirements for in-operation live-line testing of magnetically controlled circuit breakers.

[0050] Step S106: Based on the target reactance and the first correlation, determine the first variation parameter of the closing holding force of the magnetically controlled circuit breaker, wherein the first correlation represents the correlation between the excitation coil reactance term and the closing holding force term;

[0051] In step S106 of this application, the obtained target reactance is substituted into the pre-established first correlation relationship, and the first variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined by calculation or comparison.

[0052] Among them, the first correlation relationship is a pre-established quantitative or qualitative correlation relationship used to describe the relationship between the excitation coil reactance (such as the inductive reactance corresponding to the target reactance) and the closing holding force. It is derived from the magnetic circuit theory. Optionally, it can be expressed as the square of the excitation coil inductive reactance being positively correlated with the closing holding force.

[0053] This includes the closing holding force, which is the force that the magnetic control structure uses to maintain the closed state of the magnetically controlled circuit breaker. It is a core performance parameter that ensures stable closing of the circuit breaker and avoids abnormal tripping.

[0054] This involves a first variable parameter, which is the change in the closing holding force relative to the factory standard value calculated based on the target reactance and the first correlation (such as the magnitude of change, whether it decreases and the degree of decrease), reflecting the dynamic change trend of the closing holding force.

[0055] This step utilizes the first correlation to transform the directly measurable target reactance into a parameter of closing holding force change that is difficult to measure directly. This enables indirect detection of the closing holding force without disassembling the circuit breaker, reducing detection costs and minimizing the impact on normal equipment operation. At the same time, the correlation clarifies the correspondence between reactance change and holding force change, facilitating rapid determination of whether the holding force is showing a downward trend, and providing a preliminary basis for subsequent anomaly detection.

[0056] Step S108: Control the application of a changing DC current to the excitation coil and obtain the characteristic value of the excitation coil under the characteristic terms, wherein the characteristic terms include at least one of the following: excitation coil current term, excitation coil inductance term;

[0057] In step S108 provided in this application, a DC current with gradually changing amplitude is applied to the excitation coil. During the application process, the characteristic values ​​of the excitation coil under the characteristic terms (such as the excitation coil current term and the excitation coil inductance term) are measured and obtained in real time by the detection device.

[0058] This involves a variable DC current, where the amplitude of the DC current gradually changes over time (e.g., gradually increases), which can excite the magnetic saturation characteristics of the excitation coil and is used to detect the magnetic performance limit state of the magnetic control structure.

[0059] Among them, characteristic terms are parameter categories used to reflect the state of the excitation coil under the action of changing DC current. These include excitation coil current terms (such as the current value in the coil, especially the current mutation) and excitation coil inductance terms (such as the inductance value of the coil), which can indirectly reflect the magnetic saturation state of the magnetic control structure.

[0060] Among them, characteristic values ​​are involved. Characteristic values ​​are the specific values ​​corresponding to characteristic items measured during the application of a changing DC current to the excitation coil, such as the current mutation (the sudden increase in current when the magnetic saturation occurs) and the inductance stability value (the value when the inductance no longer changes with the increase of current). These are key data for judging the magnetic properties of the magnetic control structure.

[0061] Through this step, changing the DC current can effectively stimulate the magnetic saturation characteristics of the magnetic control structure, so that the magnetic performance defects of the magnetic control mechanism (such as insufficient holding force) can be reflected through changes in current and inductance. The obtained feature values ​​supplement the state data of the excitation coil from the DC detection dimension, forming a multi-dimensional detection system with the AC reactance detection in step S104. This avoids the risk of missed detection that may exist in the single AC detection dimension, and provides data support for a more comprehensive judgment of the changes in closing holding force.

[0062] Step S110: Based on the characteristic value and the second correlation relationship, determine the second variation parameter of the closing holding force of the magnetically controlled circuit breaker, wherein the second correlation relationship is used to represent the correlation between the excitation coil characteristic term and the closing holding force term;

[0063] In step S110 of this application, the characteristic values ​​(such as current mutation and inductance stability) obtained in step S108 are substituted into the pre-established second correlation (correlation between excitation coil characteristic terms and closing holding force terms) to analyze the displacement of the magnetic saturation point, and then the second variation parameter of the closing holding force is determined.

[0064] Among them, a second correlation is involved. The second correlation is a pre-established correlation used to describe the relationship between the excitation coil characteristic terms (such as current mutation and inductance stability) and the closing holding force term. It is derived based on the nonlinear magnetic saturation characteristics of the magnetic control mechanism. Optionally, it can be manifested as the magnetic saturation point being displaced when the magnetic control mechanism's attraction force decreases, corresponding to the current mutation appearing earlier and the inductance stability value decreasing.

[0065] This involves a second variation parameter, which, based on the characteristic value and the second correlation, determines another variation of the closing holding force relative to the factory standard value (such as the degree of decrease in holding force based on the magnetic saturation point displacement), reflecting the change in the closing holding force from the perspective of magnetic saturation characteristics.

[0066] Through this step, the second correlation establishes a direct link between magnetic saturation characteristics and closing holding force, making it possible to judge the holding force change through DC characteristic values; the second change parameter reflects the holding force change from the perspective of the nature of magnetic properties (magnetic saturation), complementing the first change parameter obtained from the perspective of reactance in step S106, further verifying the authenticity of the holding force change, reducing misjudgments caused by single parameter detection errors, and improving the accuracy of holding force change judgment.

[0067] Step S112: Determine the abnormal result of the magnetically controlled circuit breaker based on the first and second changing parameters of the closing holding force.

[0068] In step S112 of this application, the first changing parameter (AC reactance dimension) obtained in step S106 and the second changing parameter (DC magnetic saturation dimension) obtained in step S110 are comprehensively analyzed. If both parameters show that the closing holding force has decreased and exceeds the threshold, it is determined that the magnetically controlled circuit breaker is abnormal. If only one parameter is abnormal or both are normal, the degree of abnormality is determined by combining the threshold, and the abnormal result is finally determined.

[0069] This involves abnormal results, which are the first and second changes in the combined closing holding force. The conclusions drawn from these abnormal results are whether the magnetically controlled circuit breaker is abnormal, including normal minor abnormalities (potential tripping risk) and serious abnormalities (requiring immediate repair). The core is to determine whether there is a risk of abnormal tripping due to insufficient closing holding force.

[0070] In this step, anomaly judgment is made by integrating the holding force change parameters from two different detection dimensions, avoiding the limitations of single-dimensional detection (such as AC reactance being affected by external electromagnetic interference and DC characteristic values ​​being slightly affected by temperature), significantly improving the reliability and accuracy of anomaly judgment; it can identify the problem of insufficient closing holding force in the energized state of the magnetically controlled circuit breaker at an early stage, provide early warning of abnormal tripping risk, avoid power outage accidents in the distribution network caused by abnormal tripping, ensure the safe and reliable operation of the distribution network, and solve the problem that traditional detection methods cannot effectively warn of abnormal tripping.

[0071] Through the above steps S102-S112, a magnetically controlled circuit breaker is obtained, wherein the magnetically controlled circuit breaker includes a pole structure and a base structure, the pole structure is installed above the base structure, and the base structure includes a magnetic control structure, the magnetic control structure includes an iron core, a spring and an excitation coil; a power frequency AC current is applied to the excitation coil of the magnetically controlled circuit breaker to obtain the target reactance corresponding to the excitation coil; based on the target reactance and a first correlation, a first variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined, wherein the first correlation represents the correlation between the excitation coil reactance term and the closing holding force term; a variable DC current is applied to the excitation coil to obtain the characteristic value corresponding to the excitation coil under the characteristic term, wherein the characteristic term includes at least one of the following: excitation coil current term, excitation coil inductance term; based on the characteristic value and a second correlation, a second variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined, wherein the second correlation is used to represent the correlation between the excitation coil characteristic term and the closing holding force term; based on the first variation parameter and the second variation parameter of the closing holding force, an abnormal result of the magnetically controlled circuit breaker is determined. This invention employs a detection method based on excitation coil characteristics. By applying power frequency AC current and varying DC current to the excitation coil of a magnetically controlled circuit breaker, the characteristic values ​​corresponding to the target reactance, current, inductance, and other characteristic items are obtained. Then, based on the correlation between excitation coil reactance and closing holding force, and between excitation coil characteristic items and closing holding force, the first and second varying parameters of the closing holding force are determined. Combining these two varying parameters for comprehensive judgment achieves the goal of early warning of abnormal tripping problems in magnetically controlled circuit breakers. This invention achieves the technical effect of quickly, conveniently, and accurately identifying abnormalities in magnetically controlled circuit breakers and avoiding power outages, thereby solving the technical problem in related technologies where it is difficult to conveniently and quickly determine whether a magnetically controlled circuit breaker is abnormal.

[0072] As an optional embodiment, when the feature terms include the excitation coil current and the excitation coil inductance, the second variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined based on the feature value and the second correlation relationship. This includes: acquiring the reference saturation current corresponding to the magnetically controlled circuit breaker; real-time acquisition of the current change curve and inductance change curve corresponding to the excitation coil; when the excitation coil current continues to increase and the excitation coil inductance value changes from a first change trend to a second change trend, determining the current saturation current value at the transition moment, wherein the first change trend is that the inductance increases with the current by a factor greater than the growth threshold, and the second change trend is that the inductance increases with the current by a factor less than the growth threshold; determining the displacement state of the magnetic saturation point based on the current saturation current and the reference saturation current; and determining the second variation parameter based on the displacement state.

[0073] In this embodiment, the process of determining the second variation parameter is described.

[0074] This involves the excitation coil current term, which is a parameter describing the current state in the excitation coil. By monitoring this parameter, the change of current over time or external conditions can be obtained, which is one of the important bases for judging the magnetic saturation state of the magnetic control structure.

[0075] This involves the excitation coil inductance, a parameter that describes the inductance characteristics of the excitation coil. The inductance value changes with the magnetic circuit state (such as the degree of magnetic saturation) in the magnetic control structure and can be used as a key indicator reflecting the magnetic saturation state.

[0076] This involves the reference saturation current, which is the saturation current value corresponding to the change in the inductance value of the excitation coil when the magnetically controlled circuit breaker is in normal condition (when it leaves the factory or is in good working order). It is a reference value for judging whether the magnetic saturation point has shifted.

[0077] This includes a current variation curve, which is a curve formed by plotting time on the horizontal axis and the excitation coil current value on the vertical axis. It can intuitively show the change process of the excitation coil current over time, making it easier to capture key nodes in the current increase process.

[0078] Among them, the inductance change curve is involved. The inductance change curve is a curve formed by taking time as the horizontal axis and the inductance value of the excitation coil as the vertical axis. It can clearly reflect the changing trend of the inductance value with time (or with current) and is the core basis for judging the change of magnetic saturation state.

[0079] This involves the current saturation current value, which is the current value of the excitation coil when the inductance of the excitation coil changes from the first trend to the second trend in actual testing. It is the actual current parameter reflecting the magnetic saturation state of the current magnetic control structure.

[0080] Among them, the first trend of change is the trend of the inductance value of the excitation coil increasing with the current by a greater than the growth threshold. At this time, the magnetic control structure has not reached magnetic saturation, and the inductance value increases significantly with the current.

[0081] Among them, the second trend is the trend that the inductance of the excitation coil increases less than the growth threshold as the current increases. At this time, the magnetic control structure has reached magnetic saturation, and the inductance increases significantly with the current, or even tends to stabilize.

[0082] This involves an increase threshold, which is a critical amplitude value used to distinguish between the first and second trends of inductance value change. It is a quantitative standard for judging whether the magnetically controlled structure has entered a magnetic saturation state, and is set based on the inductance change characteristics of a normal magnetically controlled structure.

[0083] This involves the transition moment, which is the specific time point at which the change trend of the excitation coil inductance value changes from the first change trend to the second change trend. The current value corresponding to this moment is the current saturation current value, marking that the magnetic control structure has entered the magnetic saturation state.

[0084] This involves the displacement state of the magnetic saturation point, which represents the difference between the current saturation current value and the reference saturation current value. If the current saturation current value deviates from the reference saturation current value, it indicates that the magnetic saturation point has shifted. The direction (increase or decrease) and magnitude of the shift can reflect the changes in the performance of the magnetically controlled structure.

[0085] In this step, the reference saturation current corresponding to the normal state of the magnetically controlled circuit breaker is first obtained; then, the current change curve (reflecting the change of current over time) and inductance change curve (reflecting the change of inductance over time) of the excitation coil are collected in real time; as the excitation coil current continues to increase, the inductance change curve is monitored, and when the trend of the inductance value changes from the first trend of the increase being greater than the increase threshold to the second trend of the increase being less than the increase threshold, the current value corresponding to this transition moment is determined to be the current saturation current value; the current saturation current value is compared with the reference saturation current value to analyze the displacement state of the magnetic saturation point (such as whether there is displacement and the displacement amplitude); finally, based on the displacement state of the magnetic saturation point and combined with the second correlation, the second variation parameter of the closing holding force of the magnetically controlled circuit breaker is determined.

[0086] This method enables precise capture of the magnetic saturation transition point. By real-time acquisition of current and inductance change curves and distinguishing between the first and second trends based on growth thresholds, the moment of inductance trend transition can be accurately pinpointed, thereby determining the current saturation current value. This avoids misjudgments of the magnetic saturation state caused by monitoring only a single parameter (such as current), providing accurate key parameters for subsequent analysis. The displacement of the magnetic saturation point can be quantitatively determined by introducing a reference saturation current. Comparing the current saturation current with the reference value allows for quantification of the displacement state (such as displacement amplitude) at the magnetic saturation point, rather than just qualitative judgment. This makes the analysis of changes in the performance of the magnetically controlled structure more objective and accurate, providing a reliable basis for deriving changes in the closing holding force. This method can indirectly reflect the true state of the closing holding force. Based on the nonlinear magnetic saturation characteristics of the magnetic control mechanism, the displacement of the magnetic saturation point is directly related to the closing holding force (a decrease in the closing holding force leads to displacement of the magnetic saturation point). The second changing parameter, determined through the above process, can indirectly and accurately reflect the change in the closing holding force. It eliminates the need to disassemble the equipment to directly measure the holding force, meeting the requirements for live-line detection of magnetically controlled circuit breakers, reducing detection costs and minimizing interference with normal equipment operation. Furthermore, it provides core data support for anomaly detection. The second changing parameter supplements the information on the change in closing holding force from the perspective of magnetic saturation characteristics, complementing the first changing parameter obtained from the reactance dimension. Combining these two parameters to determine anomalies significantly improves the reliability of anomaly detection, avoiding the limitations of single-dimensional detection (such as errors caused by external electromagnetic interference), and providing a solid data foundation for early warning of abnormal tripping in magnetically controlled circuit breakers.

[0087] As an optional embodiment, before determining the first variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the target reactance and the first correlation, the method further includes: determining a first relationship between the closing holding force term and multiple first parameter terms, wherein the multiple first parameter terms include a residual holding force term, a vacuum permeability term, an effective cross-sectional area term of the iron core term, and a total magnetic reluctance term of the magnetic circuit term, and the holding force corresponding to the residual holding force term is the force value after subtracting the component force from the closing holding force, and the component force includes the component force of the spring; determining a second relationship between the magnetic reluctance term and multiple second parameter terms, wherein the multiple second parameter terms include an AC angular frequency term, an excitation coil turns term, and an excitation coil reactance term; and determining a first correlation based on the first relationship and the second relationship, wherein the first correlation indicates that the square of the excitation coil reactance term is positively correlated with the closing holding force term.

[0088] In this embodiment, the steps for determining the first association relationship are described.

[0089] Among them, the closing holding force term is involved. The closing holding force term describes the parameter category of the force required for the magnetic control structure to maintain the closing state of the magnetically controlled circuit breaker. It is a core performance parameter item to ensure the stable closing of the circuit breaker and avoid abnormal opening. Its value directly reflects the closing stability of the magnetic control structure.

[0090] This involves multiple first parameter terms, which are a set of parameter categories related to the closing holding force term. Specifically, they include the remaining holding force term, the vacuum permeability term, the effective cross-sectional area of ​​the iron core term, and the total magnetic reluctance of the magnetic circuit term. This is a set of basic parameter terms for deriving the relationship between the closing holding force term and the other parameters.

[0091] Among them, the residual holding force term is involved. The residual holding force term is used to describe the parameter category of a specific force value. This force value is the result of subtracting the component force from the closing holding force. It is a key parameter for measuring the actual closing capability of the magnetic control structure. Insufficient residual holding force will directly increase the risk of abnormal tripping.

[0092] This includes the vacuum permeability term, which describes the physical quantity parameter category of magnetic permeability in a vacuum environment. It is used to characterize the ability of a vacuum to conduct magnetic fields and is an indispensable basic parameter in magnetic circuit calculations.

[0093] Among them, the effective cross-sectional area of ​​the iron core is involved. The effective cross-sectional area of ​​the iron core is used to describe the parameter category of the effective cross-sectional area of ​​the iron core in the magnetic control structure for conducting magnetic flux. The size of the effective cross-sectional area of ​​the iron core will affect the magnetic flux density, and thus affect the calculation results of electromagnetic force and closing holding force.

[0094] This involves the total magnetic reluctance term of the magnetic circuit, which is a parameter category used to describe the degree of magnetic flux obstruction of the entire magnetic circuit of the magnetic control structure. The magnitude of the total magnetic reluctance is related to the magnetic circuit material and structure (such as air gap), and directly affects the magnitude of the magnetic flux in the magnetic circuit, thereby affecting the closing and holding force of the gate.

[0095] This involves component forces, which are the collective term for forces that are opposite in direction to the closing holding force. They are the forces that need to be deducted from the closing holding force when calculating the remaining holding force. Their magnitude will affect the final result of the remaining holding force, and thus reflect the actual closing holding capability of the magnetic control structure.

[0096] This involves the component force of the spring, which is a specific part of the component force. It originates from the springs in the magnetic control structure (including the opening spring and the contact spring). When the circuit is closed, the spring is under force and generates an elastic force that is opposite to the closing holding force. This is the core component of the component force.

[0097] This involves the magnetoresistive term, which is a parameter category that describes the degree to which a magnetic circuit impedes magnetic flux. Here, it can specifically refer to the total magnetoresistive term of the magnetic circuit or the magnetoresistive parameter of a certain part of the magnetic circuit. It is a key bridge connecting the characteristics of the magnetic circuit and electrical parameters (such as reactance).

[0098] This involves multiple second parameter items, which are a group of parameter categories related to the magnetoresistive term. Specifically, these include the AC angular frequency item, the number of turns of the excitation coil, and the excitation coil reactance item. The value of the magnetoresistive term can be indirectly derived from these directly measurable electrical parameters.

[0099] This includes the AC angular frequency term, which is a physical quantity parameter that describes the rate of change of AC current. Optionally, its value is equal to the product of 2π and the AC frequency (ω=2πf), and it is an important basic parameter in the calculation of AC circuit parameters (such as reactance).

[0100] Among them, the number of turns of the excitation coil is involved. The number of turns of the excitation coil is used to describe the parameter category of the number of turns of the excitation coil wire. The number of turns is fixed and is an inherent property of the excitation coil. Its value directly affects the magnetomotive force generated by the excitation coil as well as electrical parameters such as inductance and reactance.

[0101] Among them, the excitation coil reactance is involved. The excitation coil reactance is a parameter category used to describe the resistance of the excitation coil to AC current. It reflects the inductance characteristics and magnetic circuit state of the excitation coil. It is an electrical parameter that can be directly obtained through detection. Its changes can indirectly reflect the changes in the total magnetic reluctance of the magnetic circuit and the closing holding force.

[0102] Among them, the first relationship is involved. The first relationship is a pre-derived and established quantitative or qualitative correlation between the closing holding force term and multiple first parameter terms (residual holding force term, vacuum permeability term, etc.). It is the core relationship that connects the closing holding force with the basic parameters of the magnetic circuit.

[0103] This involves a second relationship, which is a pre-derived quantitative or qualitative correlation between the reluctance term and multiple second parameter terms (AC angular frequency term, excitation coil turns term, etc.), realizing the conversion of the magnetic reluctance, a magnetic circuit parameter, into an electrically measurable parameter.

[0104] In this step, firstly, a first relationship is established between the closing holding force term and multiple first parameter terms (residual holding force term, vacuum permeability term, effective cross-sectional area of ​​iron core term, and total magnetic reluctance term of magnetic circuit); then, a second relationship is established between the magnetic reluctance term and multiple second parameter terms (AC angular frequency term, number of turns of excitation coil term, and reactance of excitation coil term); finally, combining the established first and second relationships, a first correlation is derived, which clearly shows that the square of the excitation coil reactance term is positively correlated with the closing holding force term.

[0105] This method enables indirect correlation of parameters that are difficult to measure directly. Specifically, the closing holding force and total magnetic reluctance of the magnetic circuit are difficult to measure directly (requiring equipment disassembly or complex operations). A first relationship links the closing holding force to determinable parameters such as vacuum permeability (a constant physical quantity) and effective core cross-sectional area (an inherent parameter). A second relationship links the magnetic reluctance to AC angular frequency (a standard industrial parameter), number of turns in the excitation coil (an inherent parameter), and excitation coil reactance (which can be directly measured). This solves the technical challenge of directly measuring core parameters and lays the foundation for subsequent live-line testing. It ensures the practicality and accuracy of the testing. Among the multiple first and second parameters used, the vacuum permeability is a physical constant, the effective cross-sectional area of ​​the iron core and the number of turns of the excitation coil are inherent parameters of the equipment, and the AC angular frequency is a standard parameter. Only the excitation coil reactance needs to be detected in real time, which reduces the number of variables and lowers the detection error. The positive correlation of the first correlation makes the correspondence between reactance change and closing holding force change clear. By detecting the reactance, it is possible to quickly determine whether the closing holding force has decreased without complicated calculations, which meets the needs of rapid on-site detection. At the same time, it avoids the limitation of traditional detection methods (such as infrared and ultrasound) that cannot correlate with core mechanical parameters, and improves the accuracy of closing holding force judgment.

[0106] As an optional embodiment, before determining the second variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the characteristic value and the second correlation, the method further includes: determining the correlation corresponding to the magnetic control structure, wherein the correlation includes a first-stage correlation and a second-stage correlation. The first-stage correlation represents the positive correlation between magnetic field strength and magnetic induction intensity before magnetic field strength saturation, and the second-stage correlation represents the nonlinear correlation between magnetic field strength and magnetic induction intensity after magnetic field strength saturation; and determining the second correlation based on the correlation.

[0107] In this embodiment, the steps for determining the second association relationship are described.

[0108] This involves correlation, which describes the relationship between magnetic field strength and magnetic induction intensity in a magnetically controlled structure. It is divided into two stages based on whether the magnetic field strength reaches saturation, and is the basis for deriving the second correlation.

[0109] This involves the first stage of correlation, which is a part of the correlation. It corresponds to the stage where the magnetic field strength has not reached saturation. Specifically, the magnetic field strength and the magnetic induction intensity are positively correlated, that is, as the magnetic field strength increases, the magnetic induction intensity increases proportionally and synchronously.

[0110] This involves the second stage of the correlation, which is another part of the correlation. It corresponds to the stage after the magnetic field strength reaches saturation. Specifically, the magnetic field strength and magnetic induction intensity are non-linearly correlated. That is, when the magnetic field strength continues to increase, the increase in magnetic induction intensity decreases significantly and tends to stabilize.

[0111] Among them, magnetic field strength is involved. Magnetic field strength is a physical quantity that characterizes the strength and direction of the magnetic field in a magnetically controlled structure. Its magnitude is related to the current flowing through the excitation coil. When the current increases, the magnetic field strength usually increases as well. It is a key indicator for judging the magnetic saturation state.

[0112] Among them, magnetic induction intensity is involved. Magnetic induction intensity is a physical quantity that characterizes the strength of the magnetic field on the magnetic medium (such as iron core) in the magnetic control structure. Its change reflects the magnetization state of the magnetic medium, and its relationship with the magnetic field strength directly reflects the magnetic saturation characteristics of the magnetic control structure.

[0113] Among them, positive correlation is involved. Positive correlation is a form of association between variables, that is, when one variable (such as magnetic field strength) increases, another variable (such as magnetic induction intensity) also increases by a certain proportion, and the trend of change is consistent. It is applicable to the description of magnetic properties before magnetic field strength saturation.

[0114] This involves nonlinear correlation, which is another form of association between variables. That is, the changes of the two variables (magnetic field strength and magnetic induction intensity) do not follow a fixed ratio. When one variable increases, the growth rate of the other variable gradually changes (such as tending to level off). It is suitable for describing the magnetic properties after the magnetic field strength is saturated.

[0115] In this step, before determining the second variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the characteristic value and the second correlation, two preparations need to be completed: First, determine the correlation corresponding to the magnetic control structure. This correlation is divided into two stages according to whether the magnetic field strength is saturated. Before saturation, the magnetic field strength and the magnetic induction intensity are positively correlated (first stage correlation). After saturation, the two are non-linearly correlated (second stage correlation). Second, based on the determined correlation, derive the second correlation used to correlate the characteristic term of the excitation coil and the closing holding force term.

[0116] This method closely matches the actual magnetic characteristics of the magnetically controlled structure, ensuring the scientific validity of the second correlation. The core component of the magnetically controlled structure, the iron core, is made of ferromagnetic material, and its magnetic properties exhibit significant nonlinear saturation characteristics (the relationship between magnetic field strength and magnetic induction intensity differs significantly before and after saturation). By distinguishing the correlation between the first and second stages, the magnetic characteristics of the iron core at different magnetization stages are accurately described, making the second correlation derived from this correlation more closely reflect the actual working state of the magnetically controlled structure, providing a scientific basis for the accurate calculation of the subsequent second variation parameter. By clarifying the variation law of magnetic field strength and magnetic induction intensity through the correlation, the change of magnetic induction intensity can be further correlated with the change of closing holding force. The final second correlation, based on the underlying logic derivation of magnetic properties, ensures the effective correlation between the excitation coil characteristic terms (such as current and inductance, which are directly related to magnetic field strength) and the closing holding force term, improving the reliability of subsequent judgment of changes in closing holding force through characteristic values.

[0117] As an optional embodiment, after determining the abnormal result of the magnetically controlled circuit breaker based on the first and second variation parameters of the closing holding force, the method further includes: if the abnormal result is abnormal, retrieving the magnetic flux loop function; inputting the input parameters corresponding to the magnetic flux loop function into the magnetic flux loop function to obtain the closing holding force value.

[0118] In this embodiment, the steps for determining the specific closing holding force value are described when the result is abnormal.

[0119] This involves the flux loop function, which is a function established based on the mathematical model of the flux loop under abnormal conditions of the magnetic control mechanism for opening and closing of a magnetically controlled circuit breaker. It can describe the quantitative relationship between parameters such as magnetic flux, magnetic reluctance, and magnetomotive force in the magnetic circuit and the closing holding force, and is a tool for calculating the specific value of the closing holding force.

[0120] This involves input parameters, which represent the parameters required to calculate the closing holding force value by substituting them into the magnetic flux loop function. These parameters need to match the variables of the magnetic flux loop model and typically include parameters reflecting the characteristics of the magnetic circuit and coil, such as the total magnetic reluctance of the magnetic circuit, the vacuum permeability, the effective cross-sectional area of ​​the iron core, and the number of turns of the excitation coil.

[0121] This involves the closing holding force value, which is the specific value of the closing holding force calculated by substituting the input parameters into the flux loop function. It is a quantitative description of the closing holding force.

[0122] Through this step, after determining the abnormal result of the magnetically controlled circuit breaker by using the first and second changing parameters of the closing holding force, if the abnormal result is determined to be abnormal, the pre-established magnetic flux loop function can be retrieved, and the input parameters required by the function (such as total magnetic reluctance of the magnetic circuit, vacuum permeability, etc.) can be substituted into the function to calculate the specific value of the closing holding force.

[0123] This step enables quantitative confirmation of the degree of anomaly, avoiding the ambiguity of qualitative judgment. Since the first and second changing parameters only reflect the trend of the closing holding force (e.g., a decrease, or a large decrease), it is difficult to intuitively show whether its actual value is below the safety threshold for ensuring stable operation. By retrieving the flux loop function to calculate the closing holding force value, the qualitative judgment of anomaly can be upgraded to quantitative confirmation of the degree of anomaly, providing a precise basis for prioritizing subsequent handling measures (e.g., emergency maintenance, planned replacement). The accuracy of the calculation is ensured by relying on the flux loop model, improving data reliability. The flux loop function is based on the mathematical model of the flux loop of the magnetic control mechanism. This model fully considers core factors such as magnetic reluctance, magnetomotive force, and core characteristics in the magnetic circuit, and is highly matched to the actual structure of the magnetically controlled circuit breaker (e.g., core size, number of coil turns). After substituting the corresponding input parameters, the calculated closing holding force value can truly reflect the actual stress state of the magnetic control structure, avoiding empirical estimation errors that are detached from the characteristics of the magnetic circuit, and providing reliable quantitative data support for judging the root cause of the anomaly (e.g., increased magnetic reluctance leading to a decrease in holding force). This value can be used to further check whether the total magnetic reluctance of the magnetic circuit in the input parameters has increased abnormally (possibly due to moisture and corrosion of the iron core), or whether the effective cross-sectional area of ​​the iron core has decreased due to structural deformation. This allows for a quick identification of the specific cause of insufficient holding force (such as quality problems with the magnetic control mechanism or moisture and corrosion), avoiding the inefficiency of blindly disassembling and troubleshooting in traditional maintenance, shortening fault handling time, and reducing the impact of power outages on the power distribution network.

[0124] As an optional embodiment, the abnormal result of the magnetically controlled circuit breaker is determined based on the first and second variation parameters of the closing holding force, including: when the first variation parameter includes the change value of the closing holding force and the second variation parameter includes the magnetic saturation point displacement vector value, determining a first result of whether the change value of the closing holding force exceeds a first threshold, the direction of movement of the magnetic saturation point displacement vector value, and a second result of whether the magnetic saturation point displacement vector value exceeds a second threshold; when the first result is that the change value of the closing holding force exceeds the first threshold and the direction of movement is moving in the direction of increasing current, and the second result is that the magnetic saturation point displacement vector value exceeds the second threshold, the abnormal result is determined to be abnormal.

[0125] This embodiment describes how to determine if a result is abnormal.

[0126] This includes the change in closing holding force, which is a specific quantitative indicator of the first change parameter. It can be set as the difference or relative change between the current closing holding force and the standard closing holding force (such as the factory value). It can directly reflect the decrease or increase of the closing holding force and is a key data for judging the stability of closing.

[0127] This involves the magnetic saturation point displacement vector value, which is a specific quantitative indicator of the second change parameter. It includes not only the displacement amplitude of the magnetic saturation point relative to the standard position, but also the direction information of the displacement, which can fully reflect the spatial position change of the magnetic saturation point. Its change is directly related to the closing holding force.

[0128] Among them, a first threshold is involved. The first threshold is a pre-set critical value used to determine whether the change value of the closing holding force exceeds the normal range. It is derived and determined based on the minimum closing holding force required for the safe operation of the magnetically controlled circuit breaker. Exceeding this threshold means that the closing holding force has dropped to a level where there is a risk of abnormal tripping.

[0129] Among them, the first result is the conclusion drawn after judging whether the change value of the closing holding force exceeds the first threshold. The result is divided into whether the change value of the closing holding force exceeds the first threshold or does not exceed the first threshold. It is one of the important bases for judging abnormal results.

[0130] This involves the direction of movement, which is the directional information contained in the displacement vector value of the magnetic saturation point. It describes the direction of movement of the magnetic saturation point relative to the standard position. Here, it specifically refers to the direction along which the current increases or other directions. Different directions correspond to different performance abnormalities of the magnetic control structure.

[0131] This involves the direction of current increase, which is a specific case of the direction of magnetic saturation point movement. It refers to the direction in which the saturation current value corresponding to the magnetic saturation point increases relative to the standard saturation current value. This direction of movement is usually directly related to the decrease in the magnetic holding force of the magnetic control structure (such as the iron core becoming damp and corroded, which leads to an increase in magnetic resistance, requiring a larger current to reach saturation).

[0132] Among them, a second threshold is involved. The second threshold is a pre-set critical value used to determine whether the magnetic saturation point displacement vector value exceeds the normal range. It is derived and determined based on the normal magnetic saturation characteristics of the magnetically controlled circuit breaker. Exceeding this threshold means that the magnetic saturation point displacement has affected the normal operation of the magnetic control structure, indirectly reflecting the abnormal closing holding force.

[0133] The second result is a conclusion drawn after judging whether the magnetic saturation point displacement vector value exceeds the second threshold. The result is divided into whether the magnetic saturation point displacement vector value exceeds the second threshold or does not exceed the second threshold. It is another important basis for judging abnormal results.

[0134] In this step, assuming the first changing parameter is the change in closing holding force and the second changing parameter is the magnetic saturation point displacement vector value, the two parameters are first determined: first, whether the change in closing holding force exceeds a first threshold, resulting in a first result; second, the direction of movement of the magnetic saturation point displacement vector value is determined, and whether it exceeds a second threshold, resulting in a second result. When the first result is that the change in closing holding force exceeds the first threshold and the direction of movement is along the direction of increasing current, and the second result is that the magnetic saturation point displacement vector value exceeds the second threshold, the abnormal result of the magnetically controlled circuit breaker is finally determined to be abnormal.

[0135] This method enables multi-dimensional collaborative judgment, avoiding misjudgments based on a single parameter. It combines the change in the closing holding force (mechanical performance dimension) with the magnetic saturation point displacement vector value (magnetic characteristic dimension) for judgment, and supplements the crucial information of displacement direction, avoiding potential misjudgments that might occur relying solely on a single parameter (such as only looking at the holding force change). For example, if only the closing holding force change exceeds the threshold, but the magnetic saturation point shows no displacement, it may be due to detection error; however, when both parameters exceed the threshold and the displacement direction matches the characteristic of decreasing holding force (along the direction of increasing current), the reliability of anomaly judgment can be significantly improved, reducing false or missed warnings caused by single-dimensional deviations. Furthermore, clarifying the correlation of displacement direction strengthens the identification of the root cause of anomalies. Special attention is paid to the direction of movement of the magnetic saturation point displacement vector value along the direction of increasing current, which has a direct physical correlation with abnormal performance of the magnetic control structure (such as increased magnetic reluctance and decreased holding force due to moisture and corrosion of the iron core). When magnetic reluctance increases, a larger current is required to saturate the magnetic control structure, meaning the magnetic saturation point moves in the direction of increasing current. By incorporating directional judgment into the anomaly detection criteria, not only can the existence of an anomaly be confirmed, but the root cause of the anomaly (such as increased magnetic circuit resistance) can also be indirectly pointed out, providing a preliminary direction for subsequent maintenance and avoiding blind troubleshooting.

[0136] As an optional embodiment, controlling the application of a variable DC current to the excitation coil and obtaining the characteristic value of the excitation coil under the characteristic item includes: when the first variable parameter of the closing holding force exceeds a first threshold, controlling the application of a variable DC current to the excitation coil and obtaining the characteristic value of the excitation coil under the characteristic item.

[0137] In this embodiment, the sequential relationship between the two detection methods is illustrated.

[0138] This step describes the operation of controlling the application of a variable DC current to the excitation coil and obtaining the corresponding characteristic value under its characteristic terms, which requires certain preconditions to be met. The detection step of applying a variable DC current to the excitation coil and obtaining the characteristic value is only executed when the first variable parameter of the closing holding force exceeds the first threshold (i.e., it is initially judged that there is an abnormal risk in the closing holding force).

[0139] This method avoids invalid detection and reduces resource consumption. If the first changing parameter does not exceed the first threshold, it indicates that the closing holding force is within the normal range based on AC reactance. In this case, there is no need to apply a changing DC current for additional detection, avoiding unnecessary electrical operations on a normally functioning magnetically controlled circuit breaker, reducing energy consumption during the detection process, and minimizing wear on components such as the excitation coil from frequent current application, thus extending equipment lifespan and improving the overall economic efficiency of the detection work. It enables layered detection, improving the accuracy of anomaly detection. The first changing parameter exceeding the threshold is a preliminary warning based on AC reactance, which only reflects the changing trend of the closing holding force and cannot fully confirm an anomaly. By using the first changing parameter exceeding the first threshold as a prerequisite for applying a changing DC current, feature values ​​can be further obtained from the DC magnetic saturation dimension after the preliminary warning, forming a layered detection logic from preliminary warning to in-depth verification. This avoids erroneous operations caused by errors in single AC reactance detection (such as misjudgment of reactance due to external electromagnetic interference), improving the accuracy of judging abnormal closing holding forces.

[0140] Based on the above embodiments and optional embodiments, an optional implementation method is provided, which is described in detail below.

[0141] In related technologies, since the primary and secondary deeply integrated magnetically controlled circuit breakers are mostly located on important power supply lines in urban areas and long overhead lines in suburban areas, the number of users experiencing power outages after abnormal tripping is large and the outage time is long, which affects the safe and reliable operation of the power distribution network and hinders the promotion and application of magnetically controlled circuit breakers.

[0142] Currently, there is no effective means to detect abnormal tripping caused by internal defects in magnetically controlled circuit breakers in advance. Existing detection methods for switches mainly rely on infrared thermal imaging, ultrasonic and acoustic imaging. These methods cannot effectively reflect various mechanical defects within the circuit breaker and cannot provide effective early warnings for abnormal tripping. Therefore, there is an urgent need for a state-sensing and early warning technology to address the operational stability issues of magnetically controlled circuit breakers and improve their operational reliability.

[0143] In view of this, an optional embodiment of the present invention provides a method for determining abnormal results of a magnetically controlled circuit breaker, which can also be called an early warning method for abnormal tripping problems of a primary and secondary integrated magnetically controlled circuit breaker based on excitation coil feature detection. Figure 2 This is a schematic diagram of the magnetically controlled circuit breaker structure used in an optional embodiment of the present invention. Figure 3 This is a schematic diagram illustrating the operating mechanism and control circuit principle of a magnetically controlled circuit breaker applied in an optional embodiment of the present invention. Figure 4 This is a schematic diagram of the magnetically controlled circuit breaker operating linkage used in an optional embodiment of the present invention. Figure 5 This is a schematic diagram of a magnetic control structure for an optional implementation of the present invention. Figure 6 This is another schematic diagram of the magnetic control structure used in an optional embodiment of the present invention. Figure 7 This is another schematic diagram of the magnetic control structure used in an optional embodiment of the present invention. Figure 8 This is a schematic diagram of different magnetization states provided by optional embodiments of the present invention, which will be described below.

[0144] This invention proposes an early warning method for abnormal tripping problems in primary and secondary integrated magnetically controlled circuit breakers based on excitation coil feature detection. It involves: 1) establishing a mathematical model of the magnetic flux circuit under abnormal conditions of the magnetic control mechanism for opening and closing the circuit breaker; 2) establishing the correlation between the residual holding force of the primary and secondary integrated magnetically controlled circuit breaker and the characteristic quantities of the excitation coil; and 3) proposing a diagnostic method for abnormal tripping problems in primary and secondary integrated magnetically controlled circuit breakers based on excitation coil feature detection. This method enables rapid and efficient early warning of abnormal tripping problems in primary and secondary integrated magnetically controlled circuit breakers under energized conditions, thus avoiding power outages caused by abnormal tripping.

[0145] (I) Mathematical model of magnetic flux circuit under abnormal conditions of opening and closing magnetic control mechanism of primary and secondary integrated magnetic circuit breaker:

[0146] The core parameter of the magnetic control mechanism is the magnetic holding force between the moving and stationary iron cores. The high reliability and long lifespan of the magnetic control mechanism are determined by this core parameter. In practical applications, to increase the reliability of closing, the magnetic holding force is often excessive. The residual holding force is defined as the magnetic holding force minus the contact pressure and the opening spring force in the closed state. The main principle of the circuit breaker closing action is as follows: Under the action of the electromagnetic force Fhz of the excitation coil, the moving and stationary iron cores attract each other due to the electromagnetic force Fhz generated, overcoming the reverse spring force Ft of the opening spring and contact spring, driving the drive rod to move vertically upward to complete the closing action. Finally, under the action of residual magnetism, the moving and stationary iron cores overcome the reverse spring force Ft of the spring and remain in the closed position. Figure 9 This is a schematic diagram illustrating the force analysis of the closing action and the holding force analysis of the magnetic control mechanism provided in an optional embodiment of the present invention. The magnetic field circuit after the closing current is applied to the magnetic control mechanism is as follows: Figure 9 As shown.

[0147] Based on the magnetic control structure, when the tap changer is in a stable state, only the magnetic field of the permanent magnet acts on its drive mechanism, and the coil current is zero. At the moment of closing, the excitation coil generates magnetomotive force and magnetic reluctance, which includes the residual magnetomotive force and magnetic reluctance of the upper and lower parts of the switch connected in parallel, and then connected in series with the residual magnetomotive force of the iron core. Figure 10 This is a schematic diagram of the equivalent magnetic circuit provided by an optional embodiment of the present invention. The equivalent magnetic circuit is as follows: Figure 10 As shown in the figure. F m =h c Residual magnetomotive force of the iron core, h c Remanence of the iron core φ represents the effective magnetic circuit length of the iron core. m R mThe magnetic flux and magnetic reluctance of the main circuit of the iron core; the magnetic flux and magnetic reluctance of the inner air gap of the φ1 and R1 moving iron core; the magnetic flux and magnetic reluctance of the outer air gap of the φ2 and R2 moving iron core.

[0148] in:

[0149] 1) The magnetic reluctance of each part of the magnetic circuit is as follows: Taking the moving iron core fixed at the upper end of the stationary iron core as an example, A represents the cross-sectional area through which the corresponding magnetic flux passes in each part, and μ0 is the permeability of free space (4π×10⁻⁶). -7 H / m), and the reluctances are:

[0150]

[0151]

[0152]

[0153] Among them, the length of the inner air gap (the distance between the moving and stationary iron cores in the inner air gap) δ1, the cross-sectional area A1 through which the magnetic flux passes at the inner (or upper) air gap, the length of the outer air gap (the distance between the moving and stationary iron cores in the outer air gap) δ2, and the cross-sectional area A2 through which the magnetic flux passes at the outer (or lower) air gap are... m This indicates the thickness of the iron core.

[0154] 2) According to the magnetic circuit law, the equivalent magnetic circuit under the closed state of the switch can be obtained as follows:

[0155]

[0156]

[0157]

[0158] (II) Establishing the correlation between the holding force of the primary and secondary integrated magnetically controlled circuit breaker and the characteristic quantity of the excitation coil reactance:

[0159] The closing holding force of the primary and secondary integrated magnetically controlled circuit breaker is:

[0160]

[0161]

[0162] The corresponding magnetic induction intensities are as follows:

[0163]

[0164]

[0165] Among them, the magnetic flux φ1, magnetic reluctance R1, and magnetic induction intensity of the air gap in the inner layer of the moving iron core The magnetic flux φ2, magnetic reluctance R2, and magnetic induction intensity of the air gap in the outer layer of the moving iron core , The value represents the local electromagnetic force at the air gap, B0 is the magnetic induction intensity (T) of the iron core attraction area, and S0 is the iron core attraction area (calculated to be 3864.1 mm2).

[0166] It is known that in the closed-state operation, when the closing holding force changes, the magnetic reluctance R increases, and φ or B decreases. Therefore, this invention proposes to effectively detect the changes in B and I of the circuit breaker in operation by detecting the excitation reactance in the closed state, and thus detect the change in the remaining holding force.

[0167] Magnetizing reactance primarily reflects the degree to which the inductance in the magnetizing coil impedes the flow of current. In an AC circuit, when current flows through an inductor, a self-induced electromotive force is generated, thus hindering the change in current. This impediment is called magnetizing reactance, and its magnitude depends on the inductor's structure and the current frequency. Magnetic reluctance, on the other hand, characterizes the degree to which the magnetic circuit impedes magnetic flux. The reactance X of an AC coil varies with frequency f, number of turns N, and magnetic reluctance R. The greater the magnetic reluctance, the smaller the reactance; the two are inversely proportional. Furthermore, as the saturation of the core's magnetic circuit increases, the core's permeability decreases, and correspondingly, both permeability and reactance must decrease.

[0168] When current flows through the excitation coil of the magnetic control mechanism, a magnetic field energy is generated in the coil. The inductance L and reactance X generated by the excitation coil in the magnetic control mechanism are:

[0169] L=Ψ / i=N×Φ / i=N 2 / R

[0170] L=N 2 / R

[0171] X=ωL=ωN 2 / R=2πfN 2 / R

[0172]

[0173] Where Ψ is the magnetic flux linkage, ω is the AC angular frequency, I is the DC current for coil excitation, and N is the number of turns. When the number of turns N of the excitation coil is constant, the inductance of the excitation coil is inversely proportional to the magnetic reluctance, and the reactance of the excitation coil is inversely proportional to the magnetic reluctance R of the magnetic field medium.

[0174] Magnetizing reactance refers to the opposition of an inductor to alternating current, primarily reflecting the degree to which a coil impedes the flow of current. In an AC circuit, when current flows through a coil, it generates a self-induced electromotive force, thus hindering the change in current. This opposition is called magnetizing reactance, and its magnitude depends on the inductor's structure and the current frequency. Magnetic reluctance, on the other hand, characterizes the degree to which a magnetic circuit impedes magnetic flux. Similar to the opposition of resistance to current, magnetic reluctance reflects the "resistance" of a magnetic circuit to magnetic flux. Simply put, resistance is the obstruction of a conductor to the flow of current, while magnetic reluctance is the obstruction of the magnetic circuit material to the establishment of a magnetic field. The greater the magnetic reluctance, the smaller the reactance; the two are inversely proportional. Inductance is directly proportional to the square of the number of turns in the coil and directly proportional to the permeability of the magnetic field medium. As the saturation of the iron core's magnetic circuit increases, the iron core's permeability decreases, and the corresponding permeability and reactance must also decrease.

[0175] Based on the above analysis, it can be seen that when the core reluctance R increases, the excitation coil reactance decreases accordingly. Therefore, the mathematical model relating the excitation coil reactance and the closing holding force is established as follows:

[0176]

[0177]

[0178]

[0179] in, Rtotal represents the magnetic flux passing through the attraction area, and Rtotal represents the total magnetic reluctance of the magnetic circuit.

[0180] From the above formula, we can see that the square of the excitation coil reactance is positively correlated with the closing holding force.

[0181] (III) Establishing the correlation between the holding force and magnetic saturation characteristics of a primary and secondary integrated magnetically controlled circuit breaker:

[0182] The magnetic control mechanism inside a magnetically controlled circuit breaker exhibits nonlinear characteristics. Initially, when the magnetic field strength H of the ferromagnetic material increases, the magnetic induction intensity B shows a positive correlation. However, once the magnetic field strength reaches a certain value and the ferromagnetic material saturates, the magnetic induction intensity tends to remain constant, exhibiting nonlinear saturation characteristics. By applying a DC voltage across the excitation coil and measuring the current, when the current reaches a certain value, the inductance no longer increases with further current increases. At this point, the magnetic control mechanism can be considered to have reached saturation, and the current in the excitation coil will suddenly increase. Figure 11 This is a schematic diagram of the magnetic saturation characteristics provided by an optional embodiment of the present invention.

[0183] (iv) A diagnostic method for abnormal tripping of a magnetically controlled circuit breaker based on the characteristic detection of the excitation coil is proposed.

[0184] Based on the above theoretical analysis, for a primary and secondary integrated magnetically controlled circuit breaker in operation under energized conditions, the optional embodiments of the present invention provide the following method for detecting the closing stability of the combined circuit breaker.

[0185] One method is to determine whether the circuit breaker's closing holding force has decreased by applying alternating current and detecting the reactance of the excitation coil. By applying alternating current to the excitation coil and measuring and comparing the difference between the excitation coil's inductive reactance and the factory standard value, the magnitude of the closing force can be determined based on this relationship.

[0186] Secondly, by applying DC current to detect the magnetic saturation characteristics of the excitation coil, it can be determined whether the circuit breaker's closing holding force has decreased.

[0187] By applying a DC current with varying amplitude to the excitation coil and measuring the sudden change in DC current, the difference between the magnetic saturation point of the magnetic control mechanism and the factory value is determined, thus indicating the magnitude of the attraction force. A decrease in the attraction force will cause a displacement of the magnetic saturation point in the magnetic control mechanism.

[0188] Based on the above findings, determine whether the circuit breaker is malfunctioning.

[0189] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0190] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0191] Example 2

[0192] According to embodiments of the present invention, an apparatus for implementing the above-described method for determining abnormal results of a magnetically controlled circuit breaker is also provided. Figure 12 This is a structural block diagram of an abnormal result determination device for a magnetically controlled circuit breaker according to an embodiment of the present invention, as shown below. Figure 12As shown, the device includes: an acquisition module 1202, a first control module 1204, a first determination module 1206, a second control module 1208, a second determination module 1210, and a third determination module 1212. The device will be described in detail below.

[0193] Acquisition module 1202 is used to acquire a magnetically controlled circuit breaker, wherein the magnetically controlled circuit breaker includes a pole structure and a base structure, the pole structure is installed on top of the base structure, and the base structure includes a magnetic control structure, the magnetic control structure includes an iron core, a spring and an excitation coil; a first control module 1204 is connected to the acquisition module 1202, used to control the application of a power frequency AC current to the excitation coil of the magnetically controlled circuit breaker, and acquire the target reactance corresponding to the excitation coil; a first determination module 1206 is connected to the first control module 1204, used to determine the first variation parameter of the closing holding force of the magnetically controlled circuit breaker based on the target reactance and a first correlation relationship, wherein the first correlation relationship represents the correlation between the excitation coil reactance term and the closing holding force term; a second control module 1208. A first determining module 1206, connected to the first determining module 1206, is used to control the application of a changing DC current to the excitation coil and obtain the characteristic value of the excitation coil under the characteristic item, wherein the characteristic item includes at least one of the following: excitation coil current item and excitation coil inductance item; a second determining module 1210, connected to the second determining module 1208, is used to determine the second changing parameter of the closing holding force of the magnetically controlled circuit breaker based on the characteristic value and the second correlation relationship, wherein the second correlation relationship is used to represent the correlation relationship between the changing trends of the excitation coil characteristic item and the closing holding force item; a third determining module 1212, connected to the second determining module 1210, is used to determine the abnormal result of the magnetically controlled circuit breaker based on the first changing parameter and the second changing parameter of the closing holding force.

[0194] It should be noted that the above-mentioned acquisition module 1202, first control module 1204, first determination module 1206, second control module 1208, second determination module 1210 and third determination module 1212 correspond to steps S102 to S112 in the method for determining the abnormal results of implementing a magnetically controlled circuit breaker. The instances and application scenarios implemented by multiple modules and corresponding steps are the same, but are not limited to the content disclosed in the above embodiment 1.

[0195] Example 3

[0196] According to another aspect of the present invention, an electronic device is also provided, comprising: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute instructions to implement the abnormal result determination method of the magnetically controlled circuit breaker described above.

[0197] Example 4

[0198] According to another aspect of the present invention, a computer-readable storage medium is also provided, which, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the above-described method for determining the abnormal result of a magnetically controlled circuit breaker.

[0199] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0200] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0201] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0202] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0203] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0204] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0205] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method of determining abnormal results of a magnetic control circuit breaker, characterized by, The method comprises: obtaining a magnetic control circuit breaker, wherein the magnetic control circuit breaker comprises a pole column structure and a base structure, the pole column structure is installed above the base structure, the base structure comprises a magnetic control structure, the magnetic control structure comprises a core, a spring and an excitation coil; controlling to apply an alternating current to the excitation coil of the magnetic control circuit breaker, and obtaining a target reactance corresponding to the excitation coil; determining a first change parameter of a closing holding force of the magnetic control circuit breaker according to the target reactance and a first correlation relationship, wherein the first correlation relationship represents a correlation relationship between an excitation coil reactance term and a closing holding force term; controlling to apply a variable direct current to the excitation coil, and obtaining a characteristic value corresponding to the excitation coil under a characteristic term, wherein the characteristic term comprises at least one of an excitation coil current term and an excitation coil inductance term; determining a second change parameter of the closing holding force of the magnetic control circuit breaker according to the characteristic value and a second correlation relationship, wherein the second correlation relationship is used to represent a correlation relationship between an excitation coil characteristic term and a closing holding force term; determining an abnormal result of the magnetic control circuit breaker according to the first change parameter and the second change parameter of the closing holding force.

2. The method of claim 1, wherein, In the case that the characteristic term comprises the excitation coil current term and the excitation coil inductance term, determining the second change parameter of the closing holding force of the magnetic control circuit breaker according to the characteristic value and the second correlation relationship comprises: obtaining a reference saturation current corresponding to the magnetic control circuit breaker; real-time collecting a current change curve and an inductance change curve corresponding to the excitation coil; determining a current saturation current value at a transition moment when the excitation coil current continuously increases and the excitation coil inductance value changes from a first change trend to a second change trend, wherein the first change trend is that the inductance increases at an amplitude greater than a growth threshold, and the second change trend is that the inductance increases at an amplitude less than the growth threshold; determining a displacement state of a magnetic saturation point according to the current saturation current and the reference saturation current; determining the second change parameter according to the displacement state.

3. The method of claim 1, wherein, Before determining the first change parameter of the closing holding force of the magnetic control circuit breaker according to the target reactance and the first correlation relationship, the method further comprises: determining a first relationship between the closing holding force term and a plurality of first parameter terms, wherein the plurality of first parameter terms comprise a residual holding force term, a vacuum permeability term, a core effective cross-sectional area term and a total magnetic resistance term of a magnetic circuit, the residual holding force term corresponds to a force value obtained by subtracting a component force from the closing holding force, and the component force comprises a component force of the spring; determining a second relationship between the magnetic resistance term and a plurality of second parameter terms, wherein the plurality of second parameter terms comprise an alternating current angular frequency term, an excitation coil turn number term and an excitation coil reactance term; determining the first correlation relationship according to the first relationship and the second relationship, wherein the first correlation relationship represents a positive correlation relationship between a square of the excitation coil reactance term and the closing holding force term.

4. The method of claim 1, wherein, Before the second change parameter of the closing holding force of the magnetic control circuit breaker is determined according to the characteristic value and the second correlation, the method further comprises: determining a correlation corresponding to the magnetic control structure, wherein the correlation comprises a first stage correlation and a second stage correlation, the first stage correlation represents a positive correlation between the magnetic field intensity and the magnetic induction intensity before the magnetic field intensity is saturated, and the second stage correlation represents a nonlinear correlation between the magnetic field intensity and the magnetic induction intensity after the magnetic field intensity is saturated; determining the second correlation according to the correlation.

5. The method of claim 1, wherein, After the abnormal result of the magnetic control circuit breaker is determined according to the first change parameter and the second change parameter of the closing holding force, the method further comprises: in the case that the abnormal result is abnormal, calling a magnetic flux loop function; inputting input parameters corresponding to the magnetic flux loop function into the magnetic flux loop function to obtain a closing holding force value.

6. The method of claim 1, wherein, determining the abnormal result of the magnetic control circuit breaker according to the first change parameter and the second change parameter of the closing holding force, comprises: in the case that the first change parameter comprises a closing holding force change value, and the second change parameter comprises a magnetic saturation point displacement vector value, determining a first result that whether the closing holding force change value exceeds a first threshold value, a moving direction of the magnetic saturation point displacement vector value, and a second result that whether the magnetic saturation point displacement vector value exceeds a second threshold value; in the case that the first result is that the closing holding force change value exceeds the first threshold value, the moving direction is moving in the direction along which the current increases, and the second result is that the magnetic saturation point displacement vector value exceeds the second threshold value, determining that the abnormal result is abnormal.

7. The method according to any one of claims 1 to 6, characterized in that, controlling to apply a variable direct current to the excitation coil to obtain a characteristic value corresponding to the excitation coil under a characteristic item, comprises: in the case that the first change parameter of the closing holding force exceeds a first threshold value, controlling to apply a variable direct current to the excitation coil to obtain a characteristic value corresponding to the excitation coil under a characteristic item.

8. An abnormal result determination device of a magnetic contact breaker, characterized by comprising: comprises: an acquisition module, configured to acquire a magnetic control circuit breaker, wherein the magnetic control circuit breaker comprises a pole column structure and a base structure, the pole column structure is installed above the base structure, the base structure comprises a magnetic control structure, the magnetic control structure comprises an iron core, a spring and an excitation coil; a first control module, configured to control to apply an alternating current to the excitation coil of the magnetic control circuit breaker to obtain a target reactance corresponding to the excitation coil; a first determination module, configured to determine a first change parameter of a closing holding force of the magnetic control circuit breaker according to the target reactance and a first correlation, wherein the first correlation represents a correlation between an excitation coil reactance item and a closing holding force item; a second control module, configured to control to apply a variable direct current to the excitation coil to obtain a characteristic value corresponding to the excitation coil under a characteristic item, wherein the characteristic item comprises at least one of the following: an excitation coil current item, an excitation coil inductance item; A second determining module is configured to determine a second change parameter of the closing holding force of the magnetic control circuit breaker according to the characteristic value and a second correlation relationship, wherein the second correlation relationship is used to represent a correlation relationship between the excitation coil characteristic term and the closing holding force term. A third determining module is configured to determine an abnormal result of the magnetic control circuit breaker according to the first change parameter and the second change parameter of the closing holding force.

9. An electronic device, comprising: The method comprises: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the method for determining an abnormal result of a magnetic control circuit breaker according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, When the instructions in the computer readable storage medium are executed by the processor of the electronic device, the electronic device is enabled to execute the method for determining an abnormal result of a magnetic control circuit breaker according to any one of claims 1 to 7.

Images