A circuit breaker electrode erosion assessment and operating mechanism fault diagnosis method and system

Abstract

The application discloses a circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis method and system, the method comprises the following steps: taking the breaking current of the circuit breaker and the opening stroke as the model input, taking the diffusion speed of the arc striking stage as the model output, and establishing a circuit breaker electrode evaluation model; collecting the opening stroke of the operating mechanism and the breaking current of the circuit breaker in real time; based on the opening stroke collected in real time, the operating mechanism of the switch electric appliance is diagnosed for faults; the opening stroke collected in real time and the breaking current of the circuit breaker are input into the circuit breaker electrode evaluation model, the diffusion speed of the arc striking stage is obtained, and the ablation condition of the circuit breaker electrode is calculated accordingly. The application evaluates the ablation condition of the electrode through the opening stroke and the discharge current, simultaneously realizes the operation state monitoring and fault diagnosis of the circuit breaker operating mechanism, and realizes the real-time evaluation of the circuit breaker electrode ablation and the fault diagnosis of the operating mechanism without opening the cabinet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power safety, in particular to a circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis method and system. BACKGROUND

[0002] The main function of the combined switch electric appliance such as ring main unit is to protect and regulate the power grid, and to ensure the safety of power supply of the power grid. When the power system is in normal operation, the switch electric appliance plays a role in switching the operation mode of the power grid. With the proposal of the concept of smart grid and the further increase of the demand scale of distribution network, in order to coordinate the unified dispatching of the power grid, it is necessary to frequently switch and the natural environment in which the switch electric appliance is located is relatively complex, which causes mechanical wear and tear, mechanical failure and other problems.

[0003] The circuit breaker is an important part of the combined switch electric appliance such as ring main unit. In an emergency, if the line of the power system cannot be disconnected in time, it will cause serious economic loss. However, in the long-term opening process, especially when opening the short-circuit current, the circuit breaker electrode will be seriously ablated under the action of arc. Therefore, it is necessary to monitor and analyze the mechanical state and electrode ablation of various switch electric appliances in the power grid, and to predict possible faults, so as to further improve the reliability and stability of the power system.

[0004] However, the existing combined switch electric appliances such as ring main unit lack effective electrode ablation evaluation technology, and it is difficult to analyze the state of the circuit breaker electrode from the outside without opening the cabinet, especially when opening the large current circuit, typical safety accidents such as opening failure are prone to occur. SUMMARY

[0005] In order to solve the problem that the existing combined switch electric appliances such as ring main unit lack effective electrode ablation evaluation technology, the present application proposes a circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis method and system. The present application evaluates the ablation of the electrode by the opening stroke and the discharge current, and realizes the monitoring and fault diagnosis of the operating mechanism of the circuit breaker at the same time. The real-time evaluation of the electrode ablation of the circuit breaker and the fault diagnosis of the operating mechanism can be realized without opening the cabinet.

[0006] In one aspect, the present application realizes the following technical scheme:

[0007] A circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis method, the method comprising:

[0008] establishing a circuit breaker electrode evaluation model by taking the opening current of the circuit breaker and the opening stroke as the model input and taking the diffusion speed of the arcing stage as the model output;

[0009] real-time collection of the opening stroke of the operating mechanism and the opening current of the circuit breaker;

[0010] Based on the real-time collected opening stroke, the operating mechanism of the switch electric appliance is diagnosed for fault;

[0011] The real-time collected opening stroke and the breaking current of the circuit breaker are input into the circuit breaker electrode evaluation model to obtain the diffusion speed of the arc striking stage, and the ablation condition of the circuit breaker electrode is calculated accordingly.

[0012] In some embodiments, the establishment process of the circuit breaker electrode evaluation model comprises:

[0013] An actual operation simulation environment of the circuit breaker is built, and an arc extinguishing chamber with an observation window is adopted;

[0014] Arc burning images of the burning process of the arc under different breaking currents are collected;

[0015] The arc burning images are processed to obtain the diffusion speed of the arc striking stage and the opening stroke parameter of the circuit breaker;

[0016] The diffusion speed of the arc striking stage is taken as the model output, the opening stroke and the breaking current of the circuit breaker are taken as the model input, a neural network algorithm is adopted to train the model, and the circuit breaker electrode evaluation model is obtained.

[0017] In some embodiments, the processing of the arc burning images to obtain the diffusion speed of the arc striking stage and the opening stroke parameter of the circuit breaker specifically comprises:

[0018] The arc burning images are binarized to determine the arc light-emitting area of each arc burning image;

[0019] The top end longitudinal coordinate of the arc light-emitting area at the beginning of the arc striking is taken as the static contact position, and the bottom end longitudinal coordinate of the arc light-emitting area at each time point is taken as the dynamic contact position;

[0020] The coordinate difference between the static contact position and the dynamic contact position at each time point is taken as the opening stroke;

[0021] The top end diffusion speed of the arc light-emitting area is taken as the anode arc root diffusion speed, and the bottom end diffusion speed of the arc light-emitting area is taken as the cathode arc root diffusion speed;

[0022] The ratio of the actual diameter of the electrode to the pixel length of the electrode diameter in the image is taken as the correction amount, and the measured opening stroke and diffusion speed are corrected.

[0023] In some embodiments, the method further comprises:

[0024] The results of the circuit breaker electrode ablation evaluation and the operating mechanism fault diagnosis are displayed, and the downloading of the data is supported.

[0025] In some embodiments, the ablation condition calculation process of the circuit breaker electrode comprises:

[0026] According to the breaking current of the circuit breaker each time and the diffusion speed, the energy flux density injected into the anode and cathode by the arc is proportionally evaluated;

[0027] The two-dimensional temperature change of the electrode is calculated through the electrode energy conservation equation, and the melting depth and width of the electrode are obtained by combining the melting point of the electrode material, as the measurement parameters of the electrode ablation condition.

[0028] In some embodiments, the method further comprises:

[0029] When the two measurement parameters of the electrode ablation condition increase to a preset threshold value as the number of breaking operations increases, an alarm is given.

[0030] In another aspect, the present application also provides a circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis system, the system comprises:

[0031] A data processing and storage module, the data processing and storage module comprises:

[0032] A data acquisition unit, the data acquisition unit is used for real-time acquisition of the breaking stroke of the operating mechanism and the breaking current of the circuit breaker;

[0033] A fault diagnosis unit, the fault diagnosis unit is used for fault diagnosis of the operating mechanism of the switch electric appliance based on the real-time acquired breaking stroke;

[0034] And an evaluation unit, the evaluation unit inputs the real-time acquired breaking stroke and the breaking current of the circuit breaker into a pre-established circuit breaker electrode evaluation model to obtain the diffusion speed of the arc striking stage, and calculates the ablation condition of the circuit breaker electrode according to the diffusion speed.

[0035] The circuit breaker electrode evaluation model takes the breaking current of the circuit breaker and the breaking stroke as the model input, takes the diffusion speed of the arc striking stage as the model output, and is trained by using a neural network algorithm.

[0036] In some embodiments, the system further comprises a switch, a power supply, a display screen and a data download interface;

[0037] The input end of the power supply is connected with an external power supply circuit, and the output end of the power supply is connected with the switch, which is used for power supply of the data processing and storage module;

[0038] The display screen is connected with the data processing and storage module, and is used for displaying the results of the circuit breaker electrode ablation evaluation and the operating mechanism fault diagnosis;

[0039] The data download interface is connected with the data processing and storage module, and is used for downloading the stored data.

[0040] In some embodiments, the data processing and storage module, switch, power supply, display screen and data download interface are integrated in a housing.

[0041] In some embodiments, the system further comprises:

[0042] a current sensor mounted on the outgoing line end of the circuit breaker for real-time measurement of the breaking current of the circuit breaker;

[0043] and a displacement sensor mounted on the moving guide rod of the circuit breaker for real-time measurement of the opening stroke of the operating mechanism.

[0044] The current sensor and the displacement sensor are connected to the data processing and storage module for transmission of measurement signals.

[0045] The present application provides a circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis method and system. The electrode ablation evaluation model is established in advance. The electrode arc diffusion speed is obtained according to the real-time measured opening stroke of the operating mechanism and the breaking current of the circuit breaker. The ablation condition of the electrode is calculated. The operating mechanism fault diagnosis is performed according to the real-time measured opening stroke of the operating mechanism. The mechanical state and the electrode ablation condition of the switch are monitored in real time in the online operation of the switch. The health state hidden danger of the circuit breaker and the operating mechanism can be found and eliminated in time. The reliable breaking of the line is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0046] The drawings described herein are used to provide further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation of the embodiments of the present application. In the drawings:

[0047] Figure 1 The method flowchart is provided for the embodiments of the present application;

[0048] Figure 2 The circuit breaker electrode evaluation model establishment flowchart is provided for the embodiments of the present application;

[0049] Figure 3 The circuit breaker electrode evaluation model training interface diagram is provided for the embodiments of the present application;

[0050] Figure 4 The arc image processing flowchart is provided for the embodiments of the present application;

[0051] Figure 5 The system principle diagram is provided for the embodiments of the present application;

[0052] Figure 6A schematic diagram of a data processing and storage module of an embodiment of the present application is shown in FIG. 1.

[0053] Reference signs and corresponding names of parts:

[0054] 1 - current sensor, 2 - displacement sensor, 3 - data processing and storage module, 4 - switch, 5 - power supply, 6 - display screen, 7 - data download interface. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be given below in combination with embodiments and drawings. The schematic embodiments of the present application and the description thereof are only used to explain the present application and do not limit the present application.

[0056] Embodiment:

[0057] The present embodiment proposes a circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis method. The method proposed in the present embodiment can evaluate the ablation state of the circuit breaker electrode by the breaking stroke and the broken current without opening the cabinet, and simultaneously perform fault diagnosis on the circuit breaker operating mechanism.

[0058] As shown in FIG. 1, the method proposed in the present embodiment specifically includes the following steps: Figure 1

[0059] Step 1: taking the circuit breaker breaking current and the breaking stroke as model inputs, and taking the diffusion speed of the arc striking stage as model output, a circuit breaker electrode evaluation model is established.

[0060] Step 2: the breaking stroke of the operating mechanism and the circuit breaker breaking current are collected in real time.

[0061] Step 3: based on the real-time collected breaking stroke, fault diagnosis is performed on the operating mechanism of the switch device.

[0062] Step 4: the real-time collected breaking stroke and breaking current are input into the circuit breaker electrode evaluation model, the diffusion speed of the arc striking stage is obtained, and the ablation state of the circuit breaker electrode is calculated accordingly.

[0063] Further, the method proposed in the present embodiment further includes:

[0064] Step 5: the results of the circuit breaker electrode ablation evaluation and the operating mechanism fault diagnosis are displayed, and the data download is supported.

[0065] Further, as shown in FIG. 1, the specific implementation process of Step 1 of the present embodiment is as follows: Figure 2

[0066] ​​Step 11, build a practical operation simulation environment for the circuit breaker, adopt an arc extinguishing chamber with an observation window to observe the burning state of the arc from the outside.

[0067] Step 12, record the burning process of the arc at different breaking currents by a high-speed camera.

[0068] Step 13, process the arc burning image to obtain the diffusion speed in the arcing stage and the opening travel parameter of the circuit breaker.

[0069] Step 14, take the diffusion speed in the arcing stage as the model output, take the opening travel of the circuit breaker and the breaking current as the model input, train the model by using the BP neural network algorithm to obtain the electrode evaluation model of the circuit breaker, which is used to evaluate the diffusion speed in the arcing stage by the opening travel and the breaking current in the subsequent actual operation process of the circuit breaker. Obtain the model training interface diagram based on the diffusion speed in the arcing stage evaluated by the opening travel and the breaking current as shown in Figure 3

[0070] Further, as shown in Figure 4 , the image processing process of step 13 is as follows:

[0071] Step 21, perform binaryzation processing on the arc burning image to determine the arc light-emitting area of each arc burning image.

[0072] Step 22, take the top end longitudinal coordinate of the arc light-emitting area at the beginning of arcing as the static contact position, and take the bottom end longitudinal coordinate of the arc light-emitting area at each time as the moving contact position.

[0073] Step 23, take the coordinate difference between the static contact position and the moving contact position as the opening travel.

[0074] Step 24, take the top end diffusion speed of the arc light-emitting area as the anode arc root diffusion speed, and take the bottom end diffusion speed of the arc light-emitting area as the cathode arc root diffusion speed.

[0075] The arc generally occupies only a small part of the contact gap at the beginning of arcing, and then gradually spreads to the left and right sides until the arc diameter reaches the contact diameter, i.e. the arc stops spreading after covering the electrode area, then the speed of spreading to the left and right sides is called diffusion speed.

[0076] The arc contacts the cathode and the anode (i.e. the moving contact and the static contact) at the same time, and the contact surface becomes the arc root. The diffusion speed of the arc on the anode side and the diffusion speed of the arc on the cathode side may not be exactly the same, so this embodiment needs to obtain two diffusion speeds, i.e. the anode arc root diffusion speed and the cathode arc root diffusion speed. The way to obtain the diffusion speed is as follows:

[0077] ​In the burning arc image, the light-emitting area is the area where the arc is located. By comparing the width change of the arc area in the two arc images, the arc diffusion speed at this moment can be obtained, that is, v = Δx / Δt, wherein Δx represents the change of the arc root width, and Δt represents the time interval between the two adjacent arc images.

[0078] In step 25, the ratio of the actual diameter of the electrode to the pixel length of the diameter of the electrode in the image is taken as a correction value to correct the measured stroke and speed.

[0079] The stroke and speed obtained in steps 23 and 24 are both calculated based on pixel values, so they need to be converted into actual values. Therefore, in this embodiment, the ratio of the actual diameter of the electrode to the pixel length of the diameter of the electrode in the image is taken as a correction value, and the measured stroke and speed are multiplied by the correction value, so that the stroke and speed in the image can be converted into actual values. For example, if the diameter of the electrode observed in the arc image is 100 pixels and the actual diameter of the electrode is 10 mm, then if the arc width observed in the arc image is 20 pixels, it means that the actual arc width is 2 mm, and if the diffusion speed calculated in the arc image is 50 pixels / ms, then the actual diffusion speed is 5 mm / ms, that is, 5 m / s.

[0080] Further, the method proposed in this embodiment uses a current sensor and a displacement sensor to measure the breaking current of the circuit breaker and the opening stroke of the operating mechanism in real time. The current sensor can be installed at the outgoing line end of the circuit breaker to measure the breaking current of the circuit breaker in real time. The displacement sensor can be installed on the moving guide rod of the circuit breaker to measure the opening stroke of the operating mechanism in real time.

[0081] Further, the ablation condition calculation process of step 4 of this embodiment is as follows:

[0082] According to the breaking current and diffusion speed of the circuit breaker each time, the energy flux density injected into the anode and cathode by the arc is evaluated in proportion, and then the two-dimensional temperature change of the electrode is calculated through the energy conservation equation of the electrode. Combined with the melting point of the electrode material, the melting depth and width of the electrode are obtained as the measurement parameters of the electrode ablation condition. Alternatively, when the two parameters increase to a preset threshold with the increase of the breaking times, an alarm can be given.

[0083] The method proposed in this embodiment can realize real-time monitoring of the mechanical state and electrode ablation condition of the switch electric appliance under online operation, evaluation of the electrode ablation condition, diagnosis and alarm of mechanical failure, so that the operator can timely find and eliminate the health state hidden danger of the circuit breaker and operating mechanism, and ensure the reliable breaking of the line.

[0084] This embodiment also proposes a circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis system, which comprises Figure 5As shown, the system proposed in the embodiment includes a data processing and storage module 3.

[0085] Specifically as Figure 6 As shown, the data processing and storage module 3 includes:

[0086] a data acquisition unit, which is configured to acquire the opening stroke of the operating mechanism and the breaking current of the circuit breaker in real time.

[0087] a fault diagnosis unit, which is configured to perform fault diagnosis on the operating mechanism of the switchgear based on the real-time acquired opening stroke.

[0088] and an evaluation unit, which is configured to input the real-time acquired opening stroke and breaking current into a pre-established circuit breaker electrode evaluation model to obtain the diffusion speed of the arc striking stage, and calculate the ablation condition of the circuit breaker electrode according to the diffusion speed. The calculation method of the ablation condition of the circuit breaker electrode is as described in step 5 above, and will not be described in detail here.

[0089] Further, the system proposed in the embodiment further includes a switch 4, a power supply 5, a display screen 6 and a data download interface 7.

[0090] The input end of the power supply 5 is connected with an external power supply circuit, the switch 4 is connected with the output end of the power supply 5, and is configured to supply power to the data processing and storage module 3; the display screen 6 is connected with the data processing and storage module 3, and is configured to display the results of the circuit breaker electrode ablation evaluation and operating mechanism fault diagnosis; and the data download interface 7 is connected with the data processing and storage module 3, and is configured to download the stored data. Optionally, the data processing and storage module 3, the switch 4, the power supply 5, the display screen 6 and the data download interface 7 are integrated in a housing.

[0091] Further, the system proposed in the embodiment further includes:

[0092] a current sensor 1, which is installed at the outgoing line end of the circuit breaker, and is configured to measure the breaking current of the circuit breaker in real time;

[0093] and a displacement sensor 2, which is installed on the moving guide rod of the circuit breaker, and is configured to measure the opening stroke of the operating mechanism in real time.

[0094] The current sensor 1 and the displacement sensor 2 are connected with the data processing and storage module 3, and are configured to transmit the measurement signals.

[0095] Those skilled in the art will appreciate that embodiments of the application can be readily used as software, hardware, or a combination of software and hardware. In one

[0096] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or a combination of flowcharts and / or blocks in the flowcharts can be implemented by computer program instructions. Figure 1 means for carrying out functions specified in the flowchart block or blocks.

[0097] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or a combination of flowcharts and / or blocks in the flowcharts can be implemented by computer program instructions. Figure 1 means for carrying out functions specified in the flowchart block or blocks.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks in the flowcharts and / or a combination of flowcharts and / or blocks in the flowcharts can be implemented by computer program instructions. Figure 1 means for carrying out functions specified in the flowchart block or blocks.

[0099] The above detailed description has shown, described, and pointed out the aspects of the application in sufficient detail, that those skilled in the art are able to practice the application. It is the object of the reference to particular article, implementations and examples disclosed herein, which for reference in describing the application and its details. It is intended that the application not be limited only to the embodiments described in the specification, but include all alternative embodiments as can be made within the scope of the application and within the scope of equivalents thereof.

Claims

1. A method for assessing electrode erosion and diagnosing faults in the operating mechanism of a circuit breaker, characterized in that, The method includes: A circuit breaker electrode evaluation model is established using the circuit breaker breaking current and tripping stroke as model inputs and the arc diffusion velocity as model output. Real-time acquisition of the tripping stroke of the operating mechanism and the breaking current of the circuit breaker; Based on the real-time collected tripping stroke, fault diagnosis is performed on the operating mechanism of the switchgear. The real-time collected tripping stroke and circuit breaker breaking current are input into the circuit breaker electrode evaluation model to obtain the arc propagation velocity during the arc initiation stage, and the ablation status of the circuit breaker electrodes is calculated accordingly. The process of establishing the circuit breaker electrode evaluation model includes: A simulation environment for the actual operation of the circuit breaker was built, using an arc-extinguishing chamber with an observation window; Images of the arc combustion process under different breaking currents were collected; The arcing image is processed to obtain the diffusion velocity during the arc initiation stage and the circuit breaker's tripping stroke parameters; Using the arc-initiation propagation velocity as the model output and the circuit breaker's tripping stroke and breaking current as the model input, a neural network algorithm is used to train the model, resulting in the circuit breaker electrode evaluation model. The processing of the arcing image to obtain the arc-initiation propagation velocity and the circuit breaker's tripping stroke parameters specifically includes: The arc images are binarized to determine the arc luminescence area of ​​each arc image; The top vertical coordinate of the arc-emitting area at the beginning of arc initiation is taken as the position of the stationary contact, and the bottom vertical coordinate of the arc-emitting area at each moment is taken as the position of the moving contact. The difference between the position of the stationary contact and the position of the moving contact at each moment is taken as the opening stroke; The diffusion velocity at the top of the arc-emitting region is taken as the diffusion velocity of the anode arc root; the diffusion velocity at the bottom of the arc-emitting region is taken as the diffusion velocity of the cathode arc root. The ratio of the actual electrode diameter to the pixel length of the electrode diameter in the image is used as a correction value to correct the measured opening stroke and diffusion velocity.

2. The method for assessing electrode erosion and diagnosing operating mechanism faults in a circuit breaker according to claim 1, characterized in that, The method further includes: The system displays the results of circuit breaker electrode erosion assessment and operating mechanism fault diagnosis, and supports data download.

3. The method for assessing electrode erosion and diagnosing operating mechanism faults in a circuit breaker according to claim 1, characterized in that, The calculation process for the ablation of the circuit breaker electrodes includes: Based on the breaking current and diffusion rate of the circuit breaker each time, the energy flow density injected into the anode and cathode of the arc is evaluated proportionally. The two-dimensional temperature change of the electrode is calculated by the electrode energy conservation equation. Combined with the melting point of the electrode material, the melting depth and melting width of the electrode are obtained as parameters to measure the electrode ablation.

4. The method for assessing electrode erosion and diagnosing operating mechanism faults in a circuit breaker according to claim 3, characterized in that, The method further includes: An alarm is triggered when the two parameters measuring the electrode ablation condition rise to a preset threshold as the number of switching operations increases.

5. A circuit breaker electrode erosion assessment and operating mechanism fault diagnosis system, characterized in that, The system includes: The data processing and storage module includes: The data acquisition unit is used to collect the tripping stroke of the operating mechanism and the circuit breaker breaking current in real time. The fault diagnosis unit performs fault diagnosis on the operating mechanism of the switchgear based on the real-time collected tripping stroke. And, the evaluation unit, which inputs the real-time collected tripping stroke and circuit breaker breaking current into a pre-established circuit breaker electrode evaluation model to obtain the arc ignition stage diffusion rate, and calculates the ablation status of the circuit breaker electrode accordingly. The circuit breaker electrode evaluation model takes the circuit breaker breaking current and tripping stroke as model inputs, the arc-starting diffusion velocity as model output, and is trained using a neural network algorithm. The process of establishing the circuit breaker electrode evaluation model includes: A simulation environment for the actual operation of the circuit breaker was built, using an arc-extinguishing chamber with an observation window; Images of the arc combustion process under different breaking currents were collected; The arcing image is processed to obtain the diffusion velocity during the arc initiation stage and the circuit breaker's tripping stroke parameters; Using the arc-initiation propagation velocity as the model output and the circuit breaker's tripping stroke and breaking current as the model input, a neural network algorithm is used to train the model, resulting in the circuit breaker electrode evaluation model. The processing of the arcing image to obtain the arc-initiation propagation velocity and the circuit breaker's tripping stroke parameters specifically includes: The arc images are binarized to determine the arc luminescence area of ​​each arc image; The top vertical coordinate of the arc-emitting area at the beginning of arc initiation is taken as the position of the stationary contact, and the bottom vertical coordinate of the arc-emitting area at each moment is taken as the position of the moving contact. The difference between the position of the stationary contact and the position of the moving contact at each moment is taken as the opening stroke; The diffusion velocity at the top of the arc-emitting region is taken as the diffusion velocity of the anode arc root; the diffusion velocity at the bottom of the arc-emitting region is taken as the diffusion velocity of the cathode arc root. The ratio of the actual electrode diameter to the pixel length of the electrode diameter in the image is used as a correction value to correct the measured opening stroke and diffusion velocity.

6. The circuit breaker electrode erosion assessment and operating mechanism fault diagnosis system according to claim 5, characterized in that, The system also includes: a switch, a power supply, a display screen, and a data download interface; The input terminal of the power supply is connected to an external power supply circuit, and the output terminal of the power supply is connected to the switch, for powering the data processing and storage module; The display screen is connected to the data processing and storage module and is used to display the results of circuit breaker electrode erosion assessment and operating mechanism fault diagnosis. The data download interface is connected to the data processing and storage module and is used to download stored data.

7. The circuit breaker electrode erosion assessment and operating mechanism fault diagnosis system according to claim 6, characterized in that, The data processing and storage module, switch, power supply, display screen, and data download interface are integrated within the housing.

8. A circuit breaker electrode erosion assessment and operating mechanism fault diagnosis system according to any one of claims 5-7, characterized in that, The system also includes: A current sensor is installed at the outgoing terminal of the circuit breaker to measure the breaking current of the circuit breaker in real time. And a displacement sensor, which is mounted on the moving guide rod of the circuit breaker for real-time measurement of the opening stroke of the operating mechanism; The current sensor and displacement sensor are connected to the data processing and storage module for transmitting measurement signals.

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