High-voltage circuit breaker electromagnet detection system

Abstract

The invention discloses a high-voltage circuit breaker electromagnet detection system, and belongs to the technical field of high-voltage circuit breaker fault diagnosis. Four detection units are arranged, an electromagnet is detected according to changes of temperature, pressure, voltage and resistance, and during detection, a main control unit selects a corresponding detection mode based on detection requirements and generates a detection instruction; the corresponding detection unit is selected based on the detection instruction to correspondingly detect the electromagnet, the detected electromagnet information is sent to the main control unit through the output module, the main control unit analyzes the electromagnet information to obtain the detection result and generate the detection report, the problem that it is difficult to detect the electromagnet is solved, and the detection efficiency is improved. The electromagnet can be detected by changing the temperature, the working voltage and the coil resistance of the electromagnet, the electromagnet is comprehensively evaluated by adopting multiple parameters, the reliability and the precision of the test are improved, tiny attenuation of the electromagnet can be found in time, and potential safety hazards caused by fault accumulation are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage circuit breaker fault diagnosis, and in particular to a high-voltage circuit breaker electromagnet detection system. Background Art

[0002] In substations, the role of high-voltage circuit breakers cannot be ignored. The operating mechanism of the circuit breaker is mainly a spring operating mechanism, which has a built-in electromagnet for opening and closing. The performance of the electromagnet directly affects the reliability of the circuit breaker. At present, the test methods for the performance of electromagnets are relatively limited, especially the changes in its electromagnetic force cannot be detected. And the electromagnet will decay after a long time of use. The impact of decay on the hidden dangers of the mechanical aspects of the circuit breaker is a creep process, which is hidden. Once the outbreak point is reached, the electromagnet will directly affect the mechanical performance of the circuit breaker, which will bring serious safety hazards. The evaluation of the working performance and quality of the electromagnet is a problem that needs to be solved at present. At present, at the front-line site of the substation, the main technical means for the detection of the electromagnet of the operating mechanism of the high-voltage circuit breaker is to measure the current of the opening and closing coil, and verify the mechanical performance through the current curve. However, this method uses a macro analysis method, which cannot verify that the fault is caused by a problem with the electromagnet, so there is a lack of a detection method for the electromagnet.

[0003] Chinese patent, publication number: CN118131029A, publication date: June 4, 2024, discloses a high-voltage circuit breaker fault diagnosis system, including: a data acquisition module, a data transmission module, a control module, a data processing module and a fault database; the data acquisition module includes: a vibration monitoring sensor, a current sensor and an angle sensor, the vibration monitoring sensor is fixedly installed near the closing electromagnet and the opening electromagnet of the high-voltage circuit breaker or at a place in the crossbeam of the operating mechanism, the vibration monitoring sensor is used to collect vibration signals during the closing process of the high-voltage circuit breaker under various conditions, but it still reflects whether the electromagnet is faulty in a macro way, and it is impossible to verify whether the problem is caused by the electromagnet failure, and the accuracy of electromagnet detection is not high. Summary of the invention

[0004] The present invention aims at the problem that it is difficult to detect the change of the electromagnetic force of the electromagnet when detecting the high-voltage circuit breaker in the prior art, and provides a high-voltage circuit breaker electromagnet detection system. The problem of difficulty in detecting the change of the electromagnetic force of the electromagnet is solved by adopting a detection module to perform environmental test and electrical test on the electromagnet respectively, and detecting the electromagnet by changing the environmental parameters and electrical parameters of the electromagnet. In addition, multiple parameters are used for comprehensive evaluation, which improves the reliability and accuracy of the test, and can timely discover the slight attenuation of the electromagnet to avoid safety hazards caused by accumulated faults.

[0005] In a first aspect, a technical solution provided in an embodiment of the present invention is: a high-voltage circuit breaker electromagnet detection system, comprising a main control unit, an output module and a detection module connected in sequence; The main control unit selects a corresponding detection mode based on the detection requirements and generates a detection instruction; The detection module starts the corresponding detection unit to detect the high-voltage circuit breaker electromagnet based on the detection instruction, and sends the detection result to the main control unit through the output module; The main control unit analyzes the detection result to obtain the attenuation degree of the electromagnetic force of the electromagnet, and sends out an alarm signal when the attenuation degree exceeds a set threshold.

[0006] In this scheme, by detecting the changes in temperature, pressure, voltage and resistance of the electromagnet, the working voltage, temperature and coil resistance of the electromagnet can be changed when it is working. By directly detecting the action response time and action displacement size of the electromagnet under different conditions, the size of the electromagnetic force of the electromagnet can be indirectly reflected. Analysis thereof can reflect the attenuation degree of the electromagnet, thereby realizing direct detection of the electromagnet. A multi-parameter detection method is used to conduct a comprehensive evaluation of the electromagnet, thereby reducing the probability that accidental events of a single parameter will affect the test results and improving the reliability and accuracy of the test. By accurately detecting the attenuation degree of the electromagnet, the slight attenuation of the electromagnet can be discovered in time to avoid safety hazards caused by accumulated faults.

[0007] Preferably, the detection module comprises a voltage detection unit, and the voltage detection unit comprises an adjustable power supply, a voltage regulation circuit and a voltage monitoring module; The adjustable power supply outputs a corresponding voltage based on the detection instruction and obtains a detection voltage by precisely calibrating the voltage through a voltage regulation circuit; the detection voltage is connected to the high-voltage circuit breaker electromagnet, and the magnitude of the detection voltage is adjusted to obtain the action response time and displacement magnitude of the electromagnet under different voltages and send it to the main control unit to obtain the time displacement characteristics of the electromagnet under different voltages; The voltage monitoring module is used to monitor and display the magnitude of the detection voltage in real time.

[0008] In this scheme, since the working characteristics of the electromagnet are affected by the rated voltage, the smaller the rated voltage, the longer its action response time, the smaller the displacement, and the smaller the electromagnetic force. If the electromagnet already has a large attenuation, then under the same rated voltage, the electromagnetic force is smaller than that of other normal electromagnets. If it is under a smaller rated voltage, no electromagnetic force will even be generated. Therefore, according to the normal rated voltage of the electromagnet, different voltages can be applied to the electromagnet in a step-by-step manner to test its action response time and displacement, and the test results can be compared with the test results of normal electromagnets to determine the attenuation degree of the electromagnet. The adjustable power supply can accurately set the output voltage and has a stable current output capability. In order to ensure the accuracy of the output voltage, a voltage regulation circuit is set to calibrate the output voltage, which further ensures the stability of the output voltage, thereby improving the accuracy of the electromagnet test results and ensuring the detection reliability.

[0009] Preferably, the detection module further comprises a pressure detection unit, and the pressure detection unit comprises a pressure detection device, a data acquisition device and a fixing device; The pressure detection device is fixed on the contact of the electromagnet of the high-voltage circuit breaker based on a fixing device. The pressure detection device detects the impact force of the electromagnet of the high-voltage circuit breaker under different voltages based on a detection instruction, and sends the detected data to the main control unit through a data acquisition device to obtain the impact force characteristics of the electromagnet under different voltages.

[0010] In this scheme, when the electromagnet is tested under the action of voltages of different magnitudes, not only the attenuation of the electromagnet is analyzed by testing the time displacement characteristics of the electromagnet, but also the contact impact force of the electromagnet under the action of different voltages can be tested at the same time. The greater the attenuation of the electromagnet, the smaller the impact force under the same voltage. Considering the time displacement characteristics of the electromagnet comprehensively, the two can verify each other, thereby reducing the probability of accidental situations occurring during the test affecting the test results, further improving the detection accuracy, and making the test results more effective and reliable. Since pressure detection is coordinated with voltage detection, in order to prevent confusion in the test results sent during the two tests, a data acquisition device is separately set for the pressure detection unit, which is used to specifically transmit the test results of pressure detection, thereby ensuring the accuracy of information transmission and improving detection accuracy.

[0011] Preferably, the detection module further comprises a resistance detection unit, and the resistance detection unit comprises a precision resistance module, a resistance switching circuit and a resistance monitoring module; The precision resistor module includes a plurality of precision resistors with different resistance values ​​and is connected in series with the high-voltage circuit breaker electromagnet through a resistor switching circuit; the resistor switching circuit connects the corresponding precision resistor to the electromagnet coil based on the detection instruction, detects the action response time and displacement size of the electromagnet under the action of different resistances, and sends it to the main control unit to construct the time displacement curve of the electromagnet under the action of different resistances; The resistance monitoring module is used to monitor and display the resistance connected to the electromagnet coil in real time.

[0012] In this scheme, since the resistance of the coil of the electromagnet will affect the performance of the electromagnet when it is working, the larger the resistance of the coil, the smaller the electromagnetic force generated, and the smaller the resistance of the coil, the larger the electromagnetic force generated. Therefore, in order to better judge the attenuation degree of the electromagnet, a resistance detection unit is also provided to detect the working performance of the electromagnet under different coil resistances. By preparing a number of precision resistors with small resistance values, they are respectively connected in series with the electromagnet coil through a resistance switching circuit, so as to adjust the resistance of the electromagnet coil loop, and by testing the action response time and displacement size of the electromagnet under the influence of different coil loop resistances, and by comparing it with the test results of a normal electromagnet of the same specification, the attenuation degree of the electromagnet is judged. If the attenuation degree is higher, the action response time is longer and the displacement is smaller. The attenuation degree of the electromagnet can be accurately judged by comprehensively considering the voltage detection results, the resistance detection results and the pressure detection results through a multi-parameter comprehensive evaluation method, thereby improving the detection accuracy.

[0013] Preferably, the detection module further comprises a temperature detection unit, and the temperature detection unit comprises a thermocouple device, a heating device, a temperature control device and a temperature monitoring module; The temperature control device generates a corresponding temperature control instruction based on the detection instruction. The heating device is evenly attached to the electromagnet coil, and heats the electromagnet coil to a corresponding temperature according to the temperature control instruction, detects the action response time and displacement size of the electromagnet coil at different temperatures, and sends them to the main control unit to construct a time displacement curve of the electromagnet under different temperatures.

[0014] In this scheme, since the working environment temperature of the electromagnet will affect the performance of the electromagnet when it is working, when the temperature exceeds the normal working environment temperature range of the electromagnet, the electromagnetic force generated by the electromagnet will be greatly reduced. Therefore, the attenuation degree of the electromagnet can be detected according to the influence of different ambient temperatures on the working performance of the electromagnet. By selecting several temperature points within the temperature range where the electromagnet can work normally, adjusting the temperature in turn and recording the action response time and displacement size of the electromagnet, and comparing it with the test results of a normal electromagnet of the same specification, the attenuation degree of the electromagnet is judged. If the attenuation degree is higher, the action response time is longer and the displacement is smaller. The attenuation degree of the electromagnet can be accurately judged by comprehensively considering the voltage detection results, resistance detection results, pressure detection results and temperature monitoring results through a multi-parameter comprehensive evaluation method, thereby reducing the error caused by a single test and significantly improving the detection accuracy and precision.

[0015] Preferably, the thermocouple device is used to measure the temperature of the electromagnet coil and send the measurement result in the form of an electrical signal to the temperature monitoring module; the temperature monitoring module is used to convert the electrical signal sent by the thermocouple device into a digital signal and display the temperature value of the electromagnet coil in real time.

[0016] In this scheme, since a high-precision and fast-response device is needed to detect the temperature of the electromagnet coil to ensure the validity of the test results, and traditional temperature detection equipment is difficult to accurately detect the overall temperature of the electromagnet coil, which is a smaller device, a thermocouple is used to detect the coil temperature. Since the data detected by the thermocouple is an electrical signal, in order to convert it into a temperature value, the electrical signal needs to be converted into a digital signal for easy observation and understanding. Therefore, a temperature monitoring module is set up to accurately display the monitored temperature while ensuring the accuracy and speed of temperature monitoring, thereby ensuring that the set temperature is consistent with the actual temperature and ensuring the reliability of the test results.

[0017] Preferably, the output module includes an analog-to-digital conversion unit, a digital-to-analog conversion unit and a digital interface; When the detection module starts the temperature detection unit, the pressure detection unit and the voltage detection unit based on the detection instruction, the monitored coil temperature, voltage and impact force are converted into digital signals based on the analog-to-digital conversion unit and sent to the main control unit through the digital interface.

[0018] In this solution, since the signals monitored by the monitoring modules in different detection units are different, and the signals monitored by the temperature monitoring module, the pressure detection device and the voltage monitoring module are essentially electrical signals, that is, analog signals, in order to convert them into easy-to-understand temperature, pressure and voltage, an analog-to-digital conversion unit is required to convert the analog signal into a digital signal and send it to the main control unit through a digital interface. The output module converts it according to different signal types and sends it to the corresponding module through a dedicated interface, which can effectively avoid signal interference caused by the transmission of multiple signals, thereby ensuring the integrity of the content during signal transmission and the accuracy of information transmission.

[0019] Preferably, when the main control unit controls the temperature detection unit to adjust the temperature of the electromagnet coil, the digital-to-analog conversion unit in the output module is used to convert the detection instruction into a PWM signal, and the temperature control device controls the output power of the heating device based on the duty cycle of the PWM signal.

[0020] In this solution, when the temperature of the electromagnet is detected, the output power of the heating device needs to be adjusted, and the output power of the heating device needs to be controlled by an analog signal. Therefore, when performing temperature detection, the detection instruction sent by the main control unit needs to be converted into an analog signal through the digital-to-analog conversion unit in the output module, thereby realizing the control of the temperature of the electromagnet coil.

[0021] Preferably, a filter circuit is provided in the resistance switching circuit to eliminate transient voltage and current shocks generated during resistance switching.

[0022] In this scheme, when the electromagnet is tested for resistance, different resistors need to be switched to connect to the electromagnet coil, and transient voltage and current shocks may be generated during the switching process. If the transient voltage and current shocks are too large, the circuit structure of the electromagnet may be damaged, thereby affecting the detection effect and causing losses. Therefore, in order to protect the electromagnet coil, a filter circuit is set up to eliminate the transient voltage and current shocks generated when the resistance is switched, thereby ensuring the safety of the detection process.

[0023] Preferably, when the thermocouple device detects that the temperature of the electromagnet coil exceeds a set threshold, the power supply of the heating device is cut off.

[0024] In this solution, when the temperature of the electromagnet is detected, if the detected temperature is too high, the internal structure of the electromagnet will be damaged. Therefore, in order to protect the internal structure of the electromagnet and prevent the high-voltage circuit breaker from being damaged during the test, a temperature protection function is set to ensure the safety of temperature detection.

[0025] The beneficial effects of the present invention are as follows: (1) The present invention detects the electromagnet according to the changes in temperature, pressure, voltage and resistance, and can change the working voltage, temperature and coil resistance of the electromagnet when it is working. By directly detecting the action response time and action displacement size of the electromagnet under different conditions, the magnitude of the electromagnetic force of the electromagnet can be reflected indirectly. Analysis thereof can reflect the attenuation degree of the electromagnet, thereby realizing direct detection of the electromagnet and improving the pertinence of the detection. (2) The present invention adopts a multi-parameter detection method to comprehensively evaluate the electromagnet, which reduces the probability that accidental events occurring in a single parameter will affect the test results and improves the reliability and accuracy of the test; (3) The present invention can detect the attenuation degree of the electromagnet accurately, so as to timely discover the slight attenuation of the electromagnet and avoid the potential safety hazard caused by the accumulation of faults.

[0026] The above invention content is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference symbols are used throughout the drawings to represent the same parts.

[0028] Figure 1 This is a block diagram of a high voltage circuit breaker electromagnet detection system of the present invention; Figure 2 This is a schematic diagram of the working process of the voltage unit of the present invention; Figure 3 This is a schematic diagram of the working process of the pressure detection unit of the present invention; Figure 4 This is a schematic diagram of the working process of the resistance detection unit of the present invention; Figure 5 It is a schematic diagram of the working process of the temperature detection unit of the present invention. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations (or steps) as sequential processes, many of the operations (or steps) therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the drawings; the process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0031] Example: Figure 1 As shown, in order to solve the problem that it is difficult to detect the change of the electromagnetic force of the electromagnet when detecting a high-voltage circuit breaker in the prior art, this embodiment provides a high-voltage circuit breaker electromagnet detection system, including a main control unit, an output module and a detection module connected in sequence; The detection module includes a temperature detection unit, a pressure detection unit, a voltage detection unit and a resistance detection unit; the main control unit selects a corresponding detection mode and generates a detection instruction based on the detection requirements, the detection module starts the corresponding detection unit to detect the high-voltage circuit breaker electromagnet based on the detection instruction, and sends the detection result to the main control unit through the output module, the main control unit analyzes the detection result to obtain the attenuation degree of the electromagnetic force of the electromagnet, and sends an alarm signal when the attenuation degree exceeds the set threshold.

[0032] This embodiment detects the electromagnet according to the changes in temperature, pressure, voltage and resistance, and can change the working voltage, temperature and coil resistance of the electromagnet when it is working. By directly detecting the action response time and action displacement size of the electromagnet under different conditions, the size of the electromagnetic force of the electromagnet can be indirectly reflected. Analysis thereof can reflect the attenuation degree of the electromagnet, thereby realizing direct detection of the electromagnet. A multi-parameter detection method is used to conduct a comprehensive evaluation of the electromagnet, thereby reducing the probability that accidental events occurring in a single parameter will affect the test results, and improving the reliability and accuracy of the test. By accurately detecting the attenuation degree of the electromagnet, a slight attenuation of the electromagnet can be discovered in time, thereby avoiding safety hazards caused by accumulated faults.

[0033] In this embodiment, Figure 2 As shown, the voltage detection unit includes an adjustable power supply, a voltage regulation circuit and a voltage monitoring module; The adjustable power supply outputs a corresponding voltage based on the detection instruction and obtains a detection voltage by precisely calibrating the voltage through a voltage regulation circuit; the detection voltage is connected to the high-voltage circuit breaker electromagnet, and the magnitude of the detection voltage is adjusted to obtain the action response time and displacement magnitude of the electromagnet under different voltages and send it to the main control unit to obtain the time displacement characteristics of the electromagnet under different voltages; The voltage monitoring module is used to monitor and display the magnitude of the detection voltage in real time.

[0034] In this embodiment, since the working characteristics of the electromagnet are affected by the rated voltage, the smaller the rated voltage, the longer its action response time, the smaller the displacement, and the smaller the electromagnetic force. If the electromagnet already has a large attenuation, the electromagnetic force will be smaller than that of other normal electromagnets under the same rated voltage. If the electromagnetic force is not generated at a smaller rated voltage, it can even not generate electromagnetic force. Therefore, according to the normal rated voltage of the electromagnet, different voltages can be applied to the electromagnet in a step-by-step manner. For example, the action response time and displacement of the electromagnet are measured at voltage values ​​of 100%, 85%, 65% and 30% of the rated voltage of the electromagnet, respectively, and the test results are compared with the test results of the normal electromagnet to determine the attenuation degree of the electromagnet; wherein the adjustable power supply can accurately set the output voltage and has a stable current output capability, and in order to ensure the accuracy of the output voltage, a voltage regulation circuit is provided to calibrate the output voltage, further ensuring the stability of the output voltage, thereby improving the accuracy of the electromagnet test results and ensuring the detection reliability.

[0035] In this embodiment, Figure 3 As shown, the pressure detection unit includes a pressure detection device, a data acquisition device and a fixing device; The pressure detection device is fixed on the contact of the electromagnet of the high-voltage circuit breaker based on a fixing device. The pressure detection device detects the impact force of the electromagnet of the high-voltage circuit breaker under different voltages based on a detection instruction, and sends the detected data to the main control unit through a data acquisition device to obtain the impact force characteristics of the electromagnet under different voltages.

[0036] When the electromagnet is tested under the action of voltages of different magnitudes, the present embodiment not only analyzes the attenuation of the electromagnet by testing the time displacement characteristics of the electromagnet, but also can simultaneously test the contact impact force of the electromagnet under the action of voltages of different magnitudes, such as measuring the impact force of the electromagnet at voltage values ​​of 100%, 85%, 65% and 30% of the rated voltage of the electromagnet respectively. The greater the attenuation of the electromagnet, the smaller the impact force under the same voltage. Taking the time displacement characteristics of the electromagnet into consideration, the two can verify each other, thereby reducing the probability that accidental situations occurring during the test will affect the test results, further improving the detection accuracy, and making the test results more effective and reliable. Since pressure detection cooperates with voltage detection, in order to prevent confusion in the test results sent during the detection of the two, a data acquisition device is separately provided for the pressure detection unit, which is used to specifically transmit the test results of the pressure detection, thereby ensuring the accuracy of information transmission and improving the detection accuracy.

[0037] In this embodiment, Figure 4 As shown, the resistance detection unit includes a precision resistance module, a resistance switching circuit and a resistance monitoring module; The precision resistor module includes a plurality of precision resistors with different resistance values ​​and is connected in series with the high-voltage circuit breaker electromagnet through a resistor switching circuit; the resistor switching circuit connects the corresponding precision resistor to the electromagnet coil based on the detection instruction, detects the action response time and displacement size of the electromagnet under the action of different resistances, and sends it to the main control unit to construct the time displacement curve of the electromagnet under the action of different resistances; The resistance monitoring module is used to monitor and display the resistance connected to the electromagnet coil in real time.

[0038] In this embodiment, when the electromagnet is working, the resistance of its coil will affect the performance of the electromagnet. The larger the resistance of the coil, the smaller the electromagnetic force generated, and the smaller the resistance of the coil, the larger the electromagnetic force generated. Therefore, in order to better judge the attenuation degree of the electromagnet, a resistance detection unit is also provided to detect the working performance of the electromagnet under different coil resistances. By preparing a number of precision resistors with smaller resistance values, such as selecting five specifications of resistors of 0.25Ω, 1.25Ω, 2.2Ω, 3.3Ω, and 4.3Ω connected in series with the electromagnet coil, the resistance of the coil loop is configured to 3Ω, 4Ω, 5Ω, 6Ω, and 7Ω. By inserting different resistors in series and connecting them in series with the electromagnet coils through a resistor switching circuit, the resistance of the electromagnet coil loop can be adjusted. The action response time and displacement of the electromagnet under the influence of different coil loop resistances are tested, and the attenuation degree of the electromagnet is determined by comparing it with the test results of a normal electromagnet of the same specification. If the attenuation degree is higher, the action response time is longer and the displacement is smaller. The attenuation degree of the electromagnet can be accurately determined by comprehensively considering the voltage detection results, the resistance detection results and the pressure detection results through a multi-parameter comprehensive evaluation method, thereby improving the detection accuracy.

[0039] In this embodiment, Figure 5 As shown, the temperature detection unit includes a thermocouple device, a heating device, a temperature control device and a temperature monitoring module; The temperature control device generates a corresponding temperature control instruction based on the detection instruction. The heating device is evenly attached to the electromagnet coil, and heats the electromagnet coil to a corresponding temperature according to the temperature control instruction, detects the action response time and displacement size of the electromagnet coil at different temperatures, and sends them to the main control unit to construct a time displacement curve of the electromagnet under different temperatures.

[0040] In this embodiment, when the electromagnet is working, the ambient temperature of its working environment will affect the performance of the electromagnet. When the temperature exceeds the normal working ambient temperature range of the electromagnet, the electromagnetic force generated by the electromagnet will be greatly reduced. Therefore, the attenuation degree of the electromagnet can be detected according to the influence of different ambient temperatures on the working performance of the electromagnet. By selecting several temperature points within the temperature range in which the electromagnet can work normally, such as outputting 6 temperatures of 5°C, 15°C, 25°C, 35°C, 45°C, and 55°C to the electromagnet, the temperature is adjusted in turn and the action response time and displacement size of the electromagnet are recorded. By comparing it with the test results of a normal electromagnet of the same specification, the attenuation degree of the electromagnet is judged. If the attenuation degree is higher, the action response time is longer and the displacement is smaller. The attenuation degree of the electromagnet can be accurately judged by comprehensively considering the voltage detection results, the resistance detection results, the pressure detection results and the temperature monitoring results through a multi-parameter comprehensive evaluation method, thereby reducing the error caused by a single test and significantly improving the detection accuracy and precision.

[0041] In this embodiment, the thermocouple device is used to measure the temperature of the electromagnet coil and send the measurement result in the form of an electrical signal to the temperature monitoring module; the temperature monitoring module is used to convert the electrical signal sent by the thermocouple device into a digital signal and display the temperature value of the electromagnet coil in real time.

[0042] In this embodiment, a high-precision and fast-response device is required to detect the temperature of the electromagnet coil to ensure the validity of the detection result. Traditional temperature detection equipment is difficult to accurately detect the overall temperature of the electromagnet coil, which is a relatively small device. Therefore, a thermocouple is used to detect the coil temperature. Since the data detected by the thermocouple is an electrical signal, in order to convert it into a temperature value, the electrical signal needs to be converted into a digital signal for easy observation and understanding. Therefore, a temperature monitoring module is provided to accurately display the monitored temperature while ensuring the temperature monitoring accuracy and speed, thereby ensuring that the set temperature is consistent with the actual temperature and ensuring the reliability of the detection result.

[0043] In this embodiment, the output module includes an analog-to-digital conversion unit, a digital-to-analog conversion unit and a digital interface; When the detection module starts the temperature detection unit, the pressure detection unit and the voltage detection unit based on the detection instruction, the monitored coil temperature, voltage and impact force are converted into digital signals based on the analog-to-digital conversion unit and sent to the main control unit through the digital interface.

[0044] In this embodiment, since the signals monitored by the monitoring modules in different detection units are different, and the signals monitored by the temperature monitoring module, the pressure detection device and the voltage monitoring module are essentially electrical signals, i.e., analog signals, in order to convert them into easy-to-understand temperature, pressure and voltage, an analog-to-digital conversion unit is required to convert the analog signals into digital signals and send them to the main control unit through digital interfaces such as SPI, I2C and other high-speed digital interfaces. The output module converts them according to different signal types and sends them to the corresponding modules through a dedicated interface, which can effectively avoid signal interference caused by the transmission of multiple signals, thereby ensuring the integrity of the content during signal transmission and the accuracy of information transmission.

[0045] In this embodiment, when the main control unit controls the temperature detection unit to adjust the temperature of the electromagnet coil, the digital-to-analog conversion unit in the output module is used to convert the detection instruction into a PWM signal, and the temperature control device controls the output power of the heating device based on the duty cycle of the PWM signal.

[0046] In this embodiment, when performing temperature detection on the electromagnet, it is necessary to adjust the output power of the heating device, and the output power of the heating device needs to be controlled by an analog signal. Therefore, when performing temperature detection, the detection instruction sent by the main control unit needs to be converted into an analog signal through the digital-to-analog conversion unit in the output module, thereby realizing the control of the temperature of the electromagnet coil.

[0047] In this embodiment, a filter circuit is provided in the resistance switching circuit to eliminate transient voltage and current shocks generated during resistance switching.

[0048] In this embodiment, when the electromagnet is tested for resistance, different resistors need to be switched to connect to the electromagnet coil. Transient voltage and current shocks may be generated during the switching process. If the transient voltage and current shocks are too large, the circuit structure of the electromagnet may be damaged, thereby affecting the detection effect and causing losses. Therefore, in order to protect the electromagnet coil, a filtering circuit is provided to eliminate the transient voltage and current shocks generated when the resistance is switched, thereby ensuring the safety of the detection process.

[0049] In this embodiment, when the thermocouple device detects that the temperature of the electromagnet coil exceeds a set threshold, the power supply of the heating device is cut off.

[0050] In this embodiment, when the temperature of the electromagnet is detected, if the detected temperature is too high, the internal structure of the electromagnet will be damaged. Therefore, in order to protect the internal structure of the electromagnet and prevent the high-voltage circuit breaker from being damaged during the test, a temperature protection function is provided, thereby ensuring the safety during temperature detection. An overcurrent protection circuit can also be provided in the power supply circuit of the heating device and the electromagnet coil to prevent damage to the equipment due to excessive current.

[0051] It can be seen from the above embodiments that at least the following substantial effects are achieved: (1) The present invention detects the electromagnet according to the changes in temperature, pressure, voltage and resistance, and can change the working voltage, temperature and coil resistance of the electromagnet when it is working. By directly detecting the action response time and action displacement of the electromagnet under different conditions, the magnitude of the electromagnetic force of the electromagnet can be reflected indirectly. The analysis thereof can reflect the attenuation degree of the electromagnet, thereby realizing direct detection of the electromagnet and improving the pertinence of the detection. (2) The present invention adopts a multi-parameter detection method to comprehensively evaluate the electromagnet, which reduces the probability that accidental events occurring in a single parameter will affect the test results and improves the reliability and accuracy of the test; (3) The present invention can detect the attenuation degree of the electromagnet accurately, so as to timely discover the slight attenuation of the electromagnet and avoid the potential safety hazard caused by the accumulation of faults.

[0052] The specific implementation described above is a preferred implementation of a high-voltage circuit breaker electromagnet detection system of the present invention, and is not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to this specific implementation. All equivalent changes made in accordance with the shape and structure of the present invention are within the protection scope of the present invention.

Claims

1. A high voltage circuit breaker electromagnet detection system, characterized in that: It includes a main control unit, an output module and a detection module connected in sequence; The main control unit selects a corresponding detection mode based on the detection requirements and generates a detection instruction; The detection module starts the corresponding detection unit to detect the high-voltage circuit breaker electromagnet based on the detection instruction, and sends the detection result to the main control unit through the output module; The main control unit analyzes the detection result to obtain the attenuation degree of the electromagnetic force of the electromagnet, and sends out an alarm signal when the attenuation degree exceeds a set threshold.

2. A high voltage circuit breaker electromagnet detection system according to claim 1, characterized in that: The detection module includes a voltage detection unit, and the voltage detection unit includes an adjustable power supply, a voltage regulation circuit and a voltage monitoring module; The adjustable power supply outputs a corresponding voltage based on the detection instruction and obtains a detection voltage by precisely calibrating the voltage through a voltage regulation circuit; the detection voltage is connected to the high-voltage circuit breaker electromagnet, and the magnitude of the detection voltage is adjusted to obtain the action response time and displacement magnitude of the electromagnet under different voltages and send it to the main control unit to obtain the time displacement characteristics of the electromagnet under different voltages; The voltage monitoring module is used to monitor and display the magnitude of the detection voltage in real time.

3. A high voltage circuit breaker electromagnet detection system according to claim 1, characterized in that: The detection module also includes a pressure detection unit, which includes a pressure detection device, a data acquisition device and a fixing device; The pressure detection device is fixed on the contact of the electromagnet of the high-voltage circuit breaker based on a fixing device. The pressure detection device detects the impact force of the electromagnet of the high-voltage circuit breaker under different voltages based on a detection instruction, and sends the detected data to the main control unit through a data acquisition device to obtain the impact force characteristics of the electromagnet under different voltages.

4. A high voltage circuit breaker electromagnet detection system according to claim 1, characterized in that: The detection module also includes a resistance detection unit, and the resistance detection unit includes a precision resistance module, a resistance switching circuit and a resistance monitoring module; The precision resistor module includes a plurality of precision resistors with different resistance values ​​and is connected in series with the high-voltage circuit breaker electromagnet through a resistor switching circuit; the resistor switching circuit connects the corresponding precision resistor to the electromagnet coil based on the detection instruction, detects the action response time and displacement size of the electromagnet under the action of different resistances, and sends it to the main control unit to construct the time displacement curve of the electromagnet under the action of different resistances; The resistance monitoring module is used to monitor and display the resistance connected to the electromagnet coil in real time.

5. A high voltage circuit breaker electromagnet detection system according to claim 1, characterized in that: The detection module also includes a temperature detection unit, which includes a thermocouple device, a heating device, a temperature control device and a temperature monitoring module; The temperature control device generates a corresponding temperature control instruction based on the detection instruction. The heating device is evenly attached to the electromagnet coil, and heats the electromagnet coil to a corresponding temperature according to the temperature control instruction, detects the action response time and displacement size of the electromagnet coil at different temperatures, and sends them to the main control unit to construct a time displacement curve of the electromagnet under different temperatures.

6. A high voltage circuit breaker electromagnet detection system according to claim 5, characterized in that: The thermocouple device is used to measure the temperature of the electromagnet coil and send the measurement result in the form of an electrical signal to the temperature monitoring module; the temperature monitoring module is used to convert the electrical signal sent by the thermocouple device into a digital signal and display the temperature value of the electromagnet coil in real time.

7. A high voltage circuit breaker electromagnet detection system according to claim 1, characterized in that: The output module includes an analog-to-digital conversion unit, a digital-to-analog conversion unit and a digital interface; When the detection module starts the temperature detection unit, the pressure detection unit and the voltage detection unit based on the detection instruction, the monitored coil temperature, voltage and impact force are converted into digital signals based on the analog-to-digital conversion unit and sent to the main control unit through the digital interface.

8. A high voltage circuit breaker electromagnet detection system according to claim 5, characterized in that: When the main control unit controls the temperature detection unit to adjust the temperature of the electromagnet coil, the digital-to-analog conversion unit in the output module is used to convert the detection instruction into a PWM signal, and the temperature control device controls the output power of the heating device based on the duty cycle of the PWM signal.

9. A high voltage circuit breaker electromagnet detection system according to claim 5, characterized in that: When the thermocouple device detects that the temperature of the electromagnet coil exceeds a set threshold, the power supply of the heating device is cut off.

10. A high voltage circuit breaker electromagnet detection system according to claim 4, characterized in that: The resistance switching circuit is provided with a filter circuit for eliminating transient voltage and current impacts generated during resistance switching.

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