Circuit breaker closing resistor mechanical defect detection method, system, medium and equipment

Abstract

The invention discloses a circuit breaker closing resistor mechanical defect detection method, system, medium and equipment based on multi-source information test, and the method comprises the steps: carrying out the vibration acceleration test of a circuit breaker closing resistor, calculating the peak apeak of a vibration acceleration signal, judging whether the peak apeak is in a preset threshold value in a closing range, and if the peak apeak exceeds the preset threshold value, judging whether the peak apeak is in the preset threshold value; if yes, switching-on operation is carried out again until the apeak is in the preset threshold value in the switching-on range; the vibration duration tc is calculated, if the vibration duration tc exceeds a preset duration on the premise that the peak apeak is not changed, the pressing force of the closing resistor string is reduced, the closing resistor string pressing device is loosened, the closing resistor state is output as the closing resistor string is loosened, the dynamic resistance value Rm of the closing resistor of the circuit breaker is measured, and the dynamic resistance value Rm of the closing resistor of the circuit breaker is measured. And if the dynamic resistance value Rm is greater than the factory measurement calibration value R of the closing resistor, prompting that the closing resistor of the circuit breaker has a mechanical defect of surface wear.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker defect detection technology, and in particular to a method, system, medium, and equipment for detecting mechanical defects in the closing resistance of circuit breakers based on multi-source information testing. Background Technology

[0002] Circuit breakers are switching devices that close, carry, and interrupt current. They are widely used in power systems, and their reliable switching is a crucial guarantee for the safe and stable operation of the power system. Once a circuit breaker experiences internal short-circuit discharge to ground or fails to open or close, it can easily lead to line tripping, causing significant economic losses and jeopardizing the normal operation of the power system.

[0003] High-voltage circuit breakers typically require pre-insertion resistors (PIRs) to suppress overvoltage and inrush current. However, during frequent switching operations, the pre-insertion resistors are repeatedly subjected to mechanical shocks from the operating mechanism, which can easily cause mechanical damage to the resistor elements. This damage can be categorized as follows:

[0004] 1) Surface wear. During the long-term operation of ultra-high voltage tank-type circuit breakers, due to the axial compression method of fixing the closing resistor, relative displacement easily occurs between the resistor elements, which gradually develops into plating wear.

[0005] 2) Resistor element breakage. The resistor element has a structural abrupt change at its edge, leading to stress concentration upon impact and making it prone to breakage.

[0006] 3) Loose resistor series. The clamping device of the circuit breaker closing resistor consists of a spring and a pin. A certain pre-compression is applied to the spring, which is fixed by the pin, thus applying a pre-tightening force to the circuit breaker closing resistor. In the long-term operating environment of ultra-high pressure tank circuit breakers, the spring of the clamping device may age or even fail, causing the circuit breaker closing resistor series to loosen.

[0007] The aforementioned mechanical defects not only directly damage the circuit breaker structure, but also, as latent defects, can easily lead to internal short-circuit discharges to ground in tank-type circuit breakers when energized, posing a threat to the entire line. Therefore, investigating the causes of mechanical damage to the closing resistor of tank-type circuit breakers and conducting timely research on the cumulative law of mechanical damage to the closing resistor are of great significance for ensuring the safety of ultra-high voltage and extra-high voltage circuit breakers.

[0008] Existing methods for detecting the mechanical condition of circuit breaker closing resistance, particularly those based on feature extraction technology, have low diagnostic accuracy and can only be used as supplementary methods. Regular open-tank inspections are still necessary in engineering applications. Furthermore, open-tank inspections require significant manpower and resources for systems already in production.

[0009] The information disclosed in the background section is only for enhancing the understanding of the background of this invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0010] This invention provides a method, system, medium, and equipment for detecting mechanical defects in circuit breaker closing resistors based on multi-source information testing. Utilizing the surface contact theory of circuit breaker closing resistors, the resistance value changes under the condition of mechanical defects, while the vibration acceleration signal remains unchanged. This enables effective identification of mechanical defects in circuit breaker closing resistors and provides early warning before serious faults occur, thus preventing insulation accidents.

[0011] A method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing includes:

[0012] Vibration acceleration test was performed on the closing resistance of the circuit breaker. Specifically, an acceleration sensor was installed on the closing resistance of the circuit breaker under test to collect the vibration acceleration signal of the circuit breaker during the closing operation.

[0013] Calculate the peak value a of the vibration acceleration signal peak Determine the peak value a peak Whether it is within the predetermined threshold of the closing range, if the peak value a peak If the threshold is exceeded, the closing operation will be repeated until a. peak A predetermined threshold within the closing range; further, the predetermined threshold is 10~1000g, i.e., 9.8~980m / s. 2 .

[0014] Calculate the vibration duration t c If at peak a peak Under the premise that the duration of vibration remains unchanged, the vibration duration t c If the predetermined time is exceeded, it indicates that the clamping force of the closing resistor string has decreased, and the clamping device of the closing resistor string has become loose. In this case, the output closing resistor status will be "loose closing resistor string". If the vibration acceleration signal is within the predetermined threshold, i.e., 9.8~980m / s², then... 2 Internally, dynamic resistance measurement is performed, and the dynamic resistance value R of the circuit breaker closing resistance is calculated based on the ratio of voltage and current waveform data. m If the dynamic resistance R is measured, m If the closing resistance is greater than the factory-measured and calibrated value R, it indicates a mechanical defect in the circuit breaker's closing resistance due to surface wear.

[0015] In the aforementioned method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing, the vibration acceleration signal is standardized to calculate its peak value, kurtosis, and duration.

[0016] Peak value apeak It is the single-peak maximum value of the vibration time-domain waveform a:

[0017] (1)

[0018] kurtosis K v It is a dimensionless time-domain index used to describe waveform kurtosis. It is extremely sensitive to impact signals, and its calculation formula is:

[0019] (2)

[0020] In the formula, a acceleration signal, a rms These are characteristic values ​​of the acceleration signal.

[0021] The duration represents the time interval from when the signal first crosses the threshold to when it finally falls back to the threshold. Its calculation formula is:

[0022] (3)

[0023] In the aforementioned method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing, the method for testing the dynamic resistance value of the closing resistor of the circuit breaker is as follows:

[0024] The test circuit is composed of a power frequency test power supply, a circuit breaker, a series resistor, a capacitive voltage divider, and a Rogowski coil. The voltage across the circuit breaker is measured using the capacitive voltage divider, and the circuit current is measured using the Rogowski coil. A power frequency voltage is applied to the circuit to cause the circuit breaker to close. The closing resistor is connected to the circuit at this time. The voltage across the closing resistor and the current through the closing resistor are measured, and the dynamic resistance value of the circuit breaker's closing resistor is calculated.

[0025] In the method for detecting mechanical defects in the closing resistance of a circuit breaker based on multi-source information testing, the circuit breaker is a tank-type circuit breaker.

[0026] In the method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing, the mechanical defects of surface wear include plating wear.

[0027] A system for implementing the method includes:

[0028] The test circuit includes a power frequency test power supply, a tank circuit breaker, a series resistor, a capacitive voltage divider, and a Rogowski coil.

[0029] A dynamic resistance value testing module, which is connected to the test circuit to test the resistance value.

[0030] Vibration acceleration testing module, which includes a vibration acceleration sensor attached to the circuit breaker to collect vibration acceleration signals;

[0031] The vibration acceleration characteristic quantity calculation module is used to calculate the peak value and duration of the vibration acceleration signal in real time while measuring the vibration acceleration signal;

[0032] The vibration acceleration signal amplitude and duration judgment module is used to determine whether the vibration acceleration signal amplitude and duration exceed the standard, and then issue an alarm.

[0033] The resistance value judgment module identifies the mechanical state of the circuit breaker closing resistance based on the resistance value measured by the bridge.

[0034] In the system described above, the vibration acceleration signal amplitude and duration determination module includes an alarm unit.

[0035] In the system described above, the alarm unit includes a buzzer or an LED light.

[0036] A computer storage medium including computer instructions that, when run on a computer, cause the computer to perform the method.

[0037] An electronic device, the electronic device comprising:

[0038] Memory, processor, and computer programs stored in memory and executable on the processor, wherein,

[0039] The processor implements the method when executing the program.

[0040] Compared with existing technologies, this invention has the following advantages: Under conditions of mechanical defects in the closing resistor, the resistance value changes, while the vibration acceleration signal remains unchanged. This enables effective identification of mechanical defects in the circuit breaker's closing resistor and provides early warning before serious faults occur, preventing insulation accidents. Furthermore, this invention further processes the vibration acceleration signal and extracts its features for mechanical defect detection, making it highly feasible, easy to implement in the field, and with broad application prospects. Attached Figure Description

[0041] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0042] In the attached diagram:

[0043] Figure 1 This is a flowchart of the method of the present invention;

[0044] Figure 2 This is a schematic diagram showing the change in resistance value of the circuit breaker closing resistor before and after the plating wears down.

[0045] Figure 3 This is a schematic diagram showing the acceleration of the circuit breaker closing resistor series under both loose and tight clamping conditions.

[0046] Figure 4 This is a schematic diagram showing the results of identifying mechanical defects in the closing resistance of a circuit breaker based on dynamic resistance-mechanical vibration testing using the method of the present invention.

[0047] Figure 5 This is a schematic diagram of the circuit breaker site and the arrangement of vibration sensor measuring points.

[0048] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0049] Specific embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0050] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0051] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0052] like Figures 1 to 5 As shown, the method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing includes the following steps:

[0053] Vibration acceleration test was performed on the closing resistance of the circuit breaker. Specifically, an acceleration sensor was installed on the closing resistance of the circuit breaker under test to collect the vibration acceleration signal of the circuit breaker during the closing operation.

[0054] Calculate the peak value a of the vibration acceleration signal peak Determine the peak value a peak Whether it is within the predetermined threshold of the closing range, if the peak value a peak If the threshold is exceeded, the closing operation will be repeated until a. peak A predetermined threshold within the closing range; further, the predetermined threshold is 10~1000g, i.e., 9.8~980m / s. 2 .

[0055] Calculate the vibration duration t c If at peak a peak Under the premise that the duration of vibration remains unchanged, the vibration duration t c If the predetermined time is exceeded, it indicates that the clamping force of the closing resistor string has decreased, and the clamping device of the closing resistor string has become loose. In this case, the output closing resistor status will be "loose closing resistor string". If the vibration acceleration signal is within the predetermined threshold, i.e., 9.8~980m / s², then... 2 Internally, dynamic resistance measurement is performed, and the dynamic resistance value R of the circuit breaker closing resistance is calculated based on the ratio of voltage and current waveform data. m If the dynamic resistance R is measured, m If the closing resistance is greater than the factory-measured and calibrated value R, it indicates a mechanical defect in the circuit breaker's closing resistance due to surface wear.

[0056] In a preferred embodiment of the method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing, the vibration acceleration signal is standardized to calculate its peak value, kurtosis, and duration.

[0057] Peak value a peak It is the single-peak maximum value of the vibration time-domain waveform a:

[0058] (1)

[0059] kurtosis K v It is a dimensionless time-domain index used to describe waveform kurtosis. It is extremely sensitive to impact signals, and its calculation formula is:

[0060] (2)

[0061] In the formula, a acceleration signal, a rms These are characteristic values ​​of the acceleration signal.

[0062] The duration represents the time interval from when the signal first crosses the threshold to when it finally falls back to the threshold. Its calculation formula is:

[0063] (3)

[0064] In a preferred embodiment of the method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing, the method for testing the dynamic resistance value of the closing resistor of the circuit breaker is as follows:

[0065] The test circuit is composed of a power frequency test power supply, a circuit breaker, a series resistor, a capacitive voltage divider, and a Rogowski coil. The voltage across the circuit breaker is measured using the capacitive voltage divider, and the circuit current is measured using the Rogowski coil. A power frequency voltage is applied to the circuit to cause the circuit breaker to close. The closing resistor is connected to the circuit at this time. The voltage across the closing resistor and the current through the closing resistor are measured, and the dynamic resistance value of the circuit breaker's closing resistor is calculated.

[0066] In a preferred embodiment of the method for detecting mechanical defects in the closing resistance of a circuit breaker based on multi-source information testing, the circuit breaker is a tank-type circuit breaker.

[0067] In a preferred embodiment of the method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing, the mechanical defects of surface wear include plating wear.

[0068] A system for implementing the method includes:

[0069] The test circuit includes a power frequency test power supply, a tank circuit breaker, a series resistor, a capacitive voltage divider, and a Rogowski coil.

[0070] A dynamic resistance value testing module, which is connected to the test circuit to test the resistance value.

[0071] Vibration acceleration testing module, which includes a vibration acceleration sensor attached to the circuit breaker to collect vibration acceleration signals;

[0072] The vibration acceleration characteristic quantity calculation module is used to calculate the peak value and duration of the vibration acceleration signal in real time while measuring the vibration acceleration signal;

[0073] The vibration acceleration signal amplitude and duration judgment module is used to determine whether the vibration acceleration signal amplitude and duration exceed the standard, and then issue an alarm.

[0074] The resistance value judgment module identifies the mechanical state of the circuit breaker closing resistance based on the resistance value measured by the bridge.

[0075] In a preferred embodiment of the system, the vibration acceleration signal amplitude and duration determination module includes an alarm unit.

[0076] In a preferred embodiment of the system, the alarm unit includes a buzzer or an LED light.

[0077] A computer storage medium including computer instructions that, when run on a computer, cause the computer to perform the method.

[0078] An electronic device, the electronic device comprising:

[0079] Memory, processor, and computer programs stored in memory and executable on the processor, wherein,

[0080] The processor implements the method when executing the program.

[0081] In one embodiment, the method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing specifically includes the following steps:

[0082] Step 1: Before testing, set the peak threshold value of the vibration acceleration signal of the circuit breaker under test. Duration threshold t and resistance threshold R;

[0083] Step 2: During the test, the circuit breaker is closed, and the vibration acceleration sensor collects vibration data in real time to obtain acceleration signals. ;

[0084] Step 3: Determine whether the peak value of the acceleration signal reaches the discharge signal threshold. If the condition is met, proceed to step 4; otherwise, proceed to step 5.

[0085] Step 4: Determine whether the duration of the acceleration signal has reached the threshold value t. If it has, issue an alarm; otherwise, proceed to step 5.

[0086] Step 5: Measure the dynamic resistance value of the closing resistor and determine whether it exceeds the threshold value R. If so, issue an alarm.

[0087] Example

[0088] In this embodiment, the peak threshold value of the vibration acceleration signal The value is set to 30g, the duration threshold is set to 1s, the threshold value N for the number of discharge signals is set to 50, and the vibration acceleration signal... The data is collected by a vibration acceleration sensor, with the unit being g. The resistance value is measured by a dynamic resistance test, with the unit being Ω.

[0089] Based on the same inventive concept, embodiments of the present invention also provide a circuit breaker closing resistance mechanical condition detection device, comprising:

[0090] The circuit breaker closing resistance mechanical defect detection device for implementing the method includes:

[0091] Dynamic resistance value test module: a test circuit including a power frequency test power supply, a tank circuit breaker, a series resistor, a capacitive voltage divider, and a Rogowski coil;

[0092] Vibration acceleration testing module: collects vibration acceleration signals through a vibration acceleration sensor attached to the circuit breaker;

[0093] Vibration acceleration characteristic parameter calculation module: used to calculate the peak value and duration of vibration acceleration signal in real time while measuring vibration acceleration signal;

[0094] Vibration acceleration signal amplitude and duration judgment module: used to determine if the vibration acceleration signal amplitude and duration exceed the standard, and then issue an alarm;

[0095] Resistance value judgment module: Based on the resistance value of the circuit breaker closing resistor measured by the bridge, the module identifies the mechanical state of the circuit breaker closing resistor. If the resistance value increases, an alarm is issued.

[0096] A computer-readable storage medium storing one or more programs, the programs including instructions that, when executed by a computing device, cause the computing device to perform the method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing.

[0097] A computing device includes: one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include methods for performing the aforementioned method for detecting mechanical defects in the closing resistor of a circuit breaker based on multi-source information testing.

[0098] Regarding a mechanical defect in the closing resistor of a certain circuit breaker, the test results are as follows: Figure 4 As shown in the figure, the overall detection accuracy for mechanical conditions can reach 100%. Therefore, the identification method of this invention can effectively identify mechanical defects in the closing resistor of a circuit breaker, preventing insulation accidents.

[0099] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0100] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0101] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0103] In one embodiment, firstly, a vibration acceleration test is performed on the closing resistance of the circuit breaker. Acceleration sensors are installed at several suitable locations for the closing resistance of the circuit breaker under test. Then, the vibration acceleration signal of the circuit breaker during the closing operation is collected. Calculate the peak value a of the vibration acceleration signal. peakand duration t c If at peak a peak The duration of vibration is t under the premise that the change is not significant. c A significant increase in length indicates a decrease in the clamping force of the closing resistor series, meaning the clamping device is loose. If the vibration acceleration signal shows no obvious abnormalities, dynamic resistance measurement continues. A dynamic resistance testing system is used to accurately measure the dynamic resistance value of the circuit breaker's closing resistor. If the resistance value abnormally increases, it indicates a mechanical defect such as surface wear in the circuit breaker's closing resistor. This invention's method can effectively detect defects at the mechanical defect stage before insulation failure occurs, preventing circuit breaker insulation accidents.

[0104] This invention relates to vibration acceleration signal acquisition and sensor placement. Accelerometers are placed at key locations on the circuit breaker to collect vibration acceleration signals during closing operations. This acquires the dynamic response characteristics of mechanically moving parts (such as the closing resistor string) during the circuit breaker closing process. This enables early identification of abnormal states such as mechanical loosening and wear. It provides the raw data foundation for subsequent feature extraction and state assessment. The peak value α of the vibration signal is calculated. peak The signal is then compared with a set threshold. This quickly identifies whether severe vibration has occurred, providing a preliminary assessment of potential mechanical impact or structural abnormalities. It avoids misjudgments caused by operator error or external interference, improving system robustness. As a prerequisite for subsequent duration determination, it optimizes the detection process efficiency. The time interval t from the signal first crossing the threshold to its return to the threshold is defined and calculated. c It reflects the energy decay characteristics of the mechanical system, helping to identify loosening problems caused by a decrease in the clamping force of the closing resistor series. It provides richer fault diagnosis information than a single peak value. For long-term operating equipment, it can be used to assess the aging degree of mechanical components. A test circuit including a power frequency test power supply, a capacitor divider, and a Rogowski coil is constructed for measuring voltage and current. It accurately obtains the voltage across the closing resistor and the current flowing through it, achieving dynamic resistance value R. m Real-time calculation. Supports resistance monitoring under actual circuit breaker operating conditions, avoiding static measurement errors. Provides a basis for identifying surface wear-related mechanical defects. The measured dynamic resistance value R... mCompare with the factory-calibrated value R. Determine if the closing resistor has surface damage issues such as plating peeling, oxidation, or wear. Indirectly reflect mechanical condition through electrical parameters, achieving non-contact condition assessment. Compensate for defect types not covered by vibration signals, improving detection comprehensiveness. Combine vibration acceleration signals and dynamic resistance signals for joint judgment. Construct a multi-level, multi-dimensional fault identification system to improve diagnostic accuracy. Achieve simultaneous detection of mechanical defects (loosening / wear) and electrical performance degradation. Reduce the risk of misjudgment based on a single parameter, enhancing system reliability. Standardize vibration signals, extract multiple statistical features, eliminate the influence of different equipment and environmental factors on signals, and improve data comparability. Enhance feature extraction capabilities, supporting more complex pattern recognition algorithms. Facilitate the establishment of a unified condition assessment model, promoting intelligent operation and maintenance. When an anomaly is detected, alert on-site personnel via audible and visual alarms. Achieve real-time early warning, facilitating timely intervention and preventing accident escalation. Improve human-machine interaction experience, suitable for unattended substation scenarios. Enhance the system's practicality and engineering application value.

[0105] Although embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the guidance of this specification and without departing from the scope of protection of the claims of the present invention, and all of these are within the scope of protection of the present invention.

Claims

1. A method for detecting mechanical defects in the closing resistance of a circuit breaker based on multi-source information testing, characterized in that, Includes the following steps: Vibration acceleration test was performed on the closing resistance of the circuit breaker. Specifically, for the closing resistance of the circuit breaker under test, acceleration sensors were installed at several locations to collect the vibration acceleration signal of the circuit breaker under closing operation. Calculate the peak value a of the vibration acceleration signal peak Determine the peak value a peak Whether it is within the predetermined threshold of the closing range, if the peak value a peak If the threshold is exceeded, the closing operation will be repeated until a. peak A predetermined threshold within the closing range; Calculate the vibration duration t c If at peak a peak Under the premise that the duration of vibration remains unchanged, the vibration duration t c If the predetermined time is exceeded, it indicates that the clamping force of the closing resistor string has decreased, and the clamping device of the closing resistor string has become loose. The output closing resistor status will then be "loose closing resistor string." If the vibration acceleration signal is within a predetermined threshold, dynamic resistance measurement will be performed, and the dynamic resistance value R of the circuit breaker closing resistor will be calculated based on the ratio of voltage and current waveform data. m If the dynamic resistance R is measured, m If the closing resistance is greater than the factory-measured and calibrated value R, it indicates a mechanical defect in the circuit breaker's closing resistance due to surface wear.

2. The method for detecting mechanical defects in the closing resistance of a circuit breaker based on multi-source information testing according to claim 1, characterized in that, Preferably, the vibration acceleration signal is standardized to calculate its peak value, kurtosis, and duration; The peak value is the maximum value of a single peak in the vibration time-domain waveform. (1) The duration represents the time interval from when the signal first crosses the threshold to when it finally falls back to the threshold. Its calculation formula is: (2)。 3. The method for detecting mechanical defects in the closing resistance of a circuit breaker based on multi-source information testing according to claim 1, characterized in that, The method for testing the dynamic resistance value of the circuit breaker closing resistor is as follows: The test circuit is composed of a power frequency test power supply, a circuit breaker, a series resistor, a capacitive voltage divider, and a Rogowski coil. The voltage across the circuit breaker is measured using the capacitive voltage divider, and the circuit current is measured using the Rogowski coil. A power frequency voltage is applied to the circuit to cause the circuit breaker to close. The closing resistor is connected to the circuit at this time. The voltage across the closing resistor and the current through the closing resistor are measured, and the dynamic resistance value of the circuit breaker's closing resistor is calculated.

4. The method for detecting mechanical defects in the closing resistance of a circuit breaker based on multi-source information testing according to claim 1, characterized in that, The circuit breaker is a tank-type circuit breaker.

5. The method for detecting mechanical defects in the closing resistance of a circuit breaker based on multi-source information testing according to claim 1, characterized in that, Mechanical defects in surface wear include coating wear.

6. A system for implementing the method of any one of claims 1-5, characterized in that, It includes: The test circuit includes a power frequency test power supply, a tank circuit breaker, a series resistor, a capacitive voltage divider, and a Rogowski coil. A dynamic resistance value testing module, which is connected to the test circuit to test the resistance value. Vibration acceleration testing module, which includes a vibration acceleration sensor attached to the circuit breaker to collect vibration acceleration signals; The vibration acceleration characteristic quantity calculation module is used to calculate the peak value and duration of the vibration acceleration signal in real time while measuring the vibration acceleration signal; The vibration acceleration signal amplitude and duration judgment module is used to determine whether the vibration acceleration signal amplitude and duration exceed the standard, and then issue an alarm. The resistance value judgment module identifies the mechanical state of the circuit breaker closing resistance based on the resistance value measured by the bridge.

7. The system according to claim 6, characterized in that, The vibration acceleration signal amplitude and duration judgment module includes an alarm unit.

8. The system according to claim 7, characterized in that, The alarm unit includes a buzzer or an LED light.

9. A computer storage medium, characterized in that, The storage medium includes computer instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1-5.

10. An electronic device, characterized in that, The electronic device includes: Memory, processor, and computer programs stored in memory and executable on the processor, wherein, When the processor executes the program, it implements the method as described in any one of claims 1-5.

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