Field suppression switch contact resistance monitoring method and device, electronic equipment and storage medium

Abstract

The invention provides a field suppression switch contact resistance monitoring method and device, electronic equipment and a storage medium, and relates to the technical field of electric power systems.Output voltage and output current are collected in real time under the steady-state operation condition of an excitation system, a rotor loop resistance value is calculated and converted into an equivalent resistance value at a reference temperature, and the equivalent resistance value is calculated; therefore, the problems that in the prior art, due to the fact that manual regular measurement is relied on, the monitoring period is long, real-time dynamic monitoring cannot be achieved, and the influence of the environment temperature is not considered, contact resistance abnormity is difficult to find in time, and personal safety risks exist can be solved. The technical effects of accurately monitoring the contact resistance state of the main contact of the field suppression switch in real time, eliminating the interference of the environment temperature on the measurement result, early warning the poor contact fault in time, avoiding the potential safety hazard of personnel measurement and ensuring the safe, stable and continuous operation of a hydraulic power plant unit are achieved.

Description

Technical Field

[0001] This disclosure relates to the field of power system technology, and in particular to a method and apparatus for monitoring the contact resistance of a demagnetizing switch, an electronic device, and a storage medium. Background Technology

[0002] The localization of core systems in hydropower plants is an inevitable trend. However, the demagnetizing switch, a key piece of equipment, has long been monopolized by foreign companies, making domestic substitution essential. Yet, domestically produced demagnetizing switches already in use have a high failure rate due to poor contact of their main contacts, directly impacting the safe and stable operation of the generating units. Therefore, monitoring of their contact condition is necessary.

[0003] Currently, the traditional monitoring methods used in domestic power plants mainly involve manually measuring the temperature of the main contacts monthly using infrared imagers, or performing DC resistance / AC impedance tests during annual unit maintenance. These methods have long monitoring cycles, making it difficult to detect contact problems in a timely manner. Furthermore, personnel may encounter equipment malfunctions or explosions during measurements, posing a risk of personal injury and failing to meet the requirements for safe unit operation. Summary of the Invention

[0004] This disclosure provides a method and apparatus for monitoring the contact resistance of a demagnetizing switch, as well as an electronic device and a storage medium. Its main objective is to at least partially solve one of the technical problems in the related art.

[0005] According to a first aspect of this disclosure, a method for monitoring the contact resistance of a demagnetizing switch is provided, comprising: Under steady-state operating conditions, the output voltage and output current of the excitation system are collected in real time. The rotor circuit resistance value is calculated based on the output voltage and the output current, and the rotor circuit resistance value at the current ambient temperature is converted to the equivalent resistance value at the reference temperature. The equivalent resistance value is compared with a preset reference resistance value. When the deviation between the two exceeds a set threshold, a resistance abnormality alarm signal is generated.

[0006] Optional, also includes: Monitor the time-domain variation trend of the stator voltage setpoint and the measured stator voltage of the excitation system; When the time-domain variation trend is consistent and the difference remains within a preset allowable range, the excitation system is determined to be in steady-state operation.

[0007] Optionally, the consistent time-domain variation trend includes: The time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are both positive. Alternatively, both the time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are negative.

[0008] Optionally, the step of converting the rotor circuit resistance value at the current ambient temperature to the equivalent resistance value at the reference temperature includes: Based on the linear relationship between conductor resistance and temperature, the rotor circuit resistance value is converted to the resistance value corresponding to the reference temperature according to a preset temperature conversion formula.

[0009] Optional, also includes: When generating the resistance abnormality alarm signal, the current output voltage, output current, ambient temperature and the equivalent resistance value are recorded simultaneously, and a monitoring report containing abnormal parameter information is generated.

[0010] According to a second aspect of this disclosure, a device for monitoring the contact resistance of a demagnetizing switch is provided, comprising: The acquisition unit is used to acquire the output voltage and output current of the excitation system in real time under the condition that the excitation system is in steady-state operation. The calculation unit is used to calculate the rotor circuit resistance value based on the output voltage and the output current, and convert the rotor circuit resistance value at the current ambient temperature to the equivalent resistance value at the reference temperature; The generation unit is used to compare the equivalent resistance value with a preset reference resistance value, and generate a resistance abnormality alarm signal when the deviation between the two exceeds a set threshold.

[0011] Optional, also includes: The monitoring unit is used to monitor the time-domain variation trend of the stator voltage setpoint and the measured stator voltage of the excitation system; when the time-domain variation trend is consistent and the difference is maintained within a preset allowable range, the excitation system is determined to be in steady-state operation.

[0012] Optionally, the consistent time-domain variation trend includes: The time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are both positive. Alternatively, both the time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are negative.

[0013] Optionally, the computing unit is also used for: Based on the linear relationship between conductor resistance and temperature, the rotor circuit resistance value is converted to the resistance value corresponding to the reference temperature according to a preset temperature conversion formula.

[0014] Optional, also includes: The recording unit is used to simultaneously record the current output voltage, output current, ambient temperature and equivalent resistance value when the resistance abnormality alarm signal is generated, and to generate a monitoring report containing abnormal parameter information.

[0015] According to a third aspect of this disclosure, an electronic device is provided, comprising: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method described in the first aspect above.

[0016] According to a fourth aspect of this disclosure, a non-transitory computer-readable storage medium is provided storing computer instructions, wherein the computer instructions are configured to cause the computer to perform the method described in the first aspect above.

[0017] According to a fifth aspect of this disclosure, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the method described in the first aspect above.

[0018] The method, device, electronic equipment, and storage medium for monitoring the contact resistance of the demagnetizing switch provided in this disclosure acquire the output voltage and output current in real time under the steady-state operating conditions of the excitation system, calculate the rotor circuit resistance value and convert it to the equivalent resistance value at the reference temperature, and then compare it with the preset reference resistance value. When the deviation exceeds the set threshold, an abnormal alarm signal is generated. Therefore, it can solve the problems of existing technologies that rely on manual periodic measurement, have long monitoring cycles, cannot monitor in real time, and do not consider the influence of ambient temperature, making it difficult to detect abnormal contact resistance in a timely manner and posing personal safety risks. It achieves the technical effects of real-time and accurate monitoring of the contact resistance status of the main contacts of the demagnetizing switch, eliminating the interference of ambient temperature on the measurement results, timely warning of poor contact faults, avoiding safety hazards for personnel measurement, and ensuring the safe, stable, and continuous operation of hydropower plant units.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0020] The accompanying drawings are provided to better understand this solution and do not constitute a limitation of this disclosure. Wherein: Figure 1 A schematic flowchart illustrating a method for monitoring the contact resistance of a demagnetizing switch provided in this embodiment of the present disclosure; Figure 2 This is a schematic diagram of the structure of a contact resistance monitoring device for a demagnetizing switch provided in an embodiment of this disclosure; Figure 3 A schematic block diagram of an example electronic device provided for embodiments of this disclosure. Detailed Implementation

[0021] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0022] The following description, with reference to the accompanying drawings, describes a method and apparatus for monitoring the contact resistance of a demagnetizing switch, an electronic device, and a storage medium according to embodiments of the present disclosure.

[0023] Figure 1 This is a flowchart illustrating a method for monitoring the contact resistance of a demagnetizing switch, as provided in an embodiment of this disclosure.

[0024] like Figure 1 As shown, the method includes the following steps: Step 101: Under steady-state operating conditions, the output voltage and output current of the excitation system are collected in real time.

[0025] In the embodiments of this disclosure, to ensure that the subsequent resistance calculation results can accurately reflect the actual electrical characteristics of the rotor circuit of the excitation system, the operating state of the excitation system must first be determined. When the system meets the preset steady-state operation judgment criteria, real-time acquisition of the excitation system output voltage (i.e., excitation voltage) and output current (i.e., excitation current) is initiated. The steady-state operation judgment criteria are set based on the correlation characteristics between the voltage setpoint parameters of the excitation system and the actual sampled voltage parameters, ensuring that the acquisition process is only performed when the system operating state is stable and the data has reference value. The acquisition method can employ voltage detection elements and current detection elements adapted to the electrical circuit of the excitation system to acquire signals. As one implementation method, steady-state operation can be determined by judging that the change trend of the total stator voltage setpoint and the sampled stator voltage is consistent and the difference between the two is within a set range. The output voltage can be acquired at the DC busbar of the excitation system output, and the output current can be acquired by connecting a resistor shunt in series in the rotor circuit.

[0026] It can effectively eliminate data interference during the unsteady operation of the excitation system, ensure the accuracy and reliability of the acquired output voltage and current signals, provide basic data support for the accurate calculation of the rotor circuit resistance value, and thus realize real-time monitoring of the contact status of the main contacts of the demagnetizing switch.

[0027] Step 102: Calculate the rotor circuit resistance value based on the output voltage and the output current, and convert the rotor circuit resistance value at the current ambient temperature to the equivalent resistance value at the reference temperature.

[0028] In the embodiments of this disclosure, based on the acquired excitation system output voltage (i.e., excitation voltage) and output current (i.e., excitation current), the rotor circuit resistance value at the current ambient temperature is calculated according to the fundamental laws of electricity. Simultaneously, considering the influence of ambient temperature on the resistance parameters, a temperature compensation mechanism is introduced to convert the rotor circuit resistance value at the current ambient temperature to a preset reference temperature, obtaining an equivalent resistance value with a unified comparison benchmark, thereby eliminating the interference of temperature fluctuations on the resistance measurement results. As one implementation method, the rotor circuit resistance value can be calculated using Ohm's law, and 75°C can be selected as the reference temperature. A preset temperature conversion formula is used to convert the resistance value at the current ambient temperature to this reference temperature, ensuring the comparability of the resistance data.

[0029] It can effectively eliminate the influence of ambient temperature on rotor circuit resistance measurement, so that the calculated equivalent resistance value has a unified and stable comparison benchmark, significantly improving the accuracy and reliability of resistance measurement results, and providing accurate data support for subsequent resistance anomaly judgment.

[0030] Step 103: Compare the equivalent resistance value with a preset reference resistance value. When the deviation between the two exceeds a set threshold, generate a resistance abnormality alarm signal.

[0031] In the embodiments of this disclosure, a preset reference resistance value consistent with the reference temperature of the equivalent resistance value is defined. This reference resistance value must reflect the normal resistance state of the rotor circuit of the excitation system. Subsequently, a preset comparison mechanism is used to perform correlation analysis between the equivalent resistance value and the reference resistance value. A reasonable deviation threshold is set as the basis for judging resistance anomalies. When the deviation between the equivalent resistance value and the reference resistance value reaches or exceeds the set threshold, a resistance anomaly alarm signal is automatically generated and output to achieve timely notification of rotor circuit resistance anomalies. As one implementation, the reference resistance value is the rotor circuit resistance value converted to the reference temperature when the excitation system is put into operation, with a set threshold of +2%. When the difference between the equivalent resistance value and the reference resistance value exceeds +2%, the generation of the resistance anomaly alarm signal is triggered.

[0032] By using standardized comparison logic and clear threshold judgment, abnormal changes in rotor circuit resistance can be accurately identified, enabling timely early warning of faults. This facilitates maintenance personnel in quickly conducting fault investigation and handling, effectively preventing the expansion of faults caused by abnormal contact resistance, and further ensuring the safe and stable operation of hydropower plant units.

[0033] The method for monitoring the contact resistance of the demagnetizing switch provided in this disclosure acquires the output voltage and current in real time under steady-state operating conditions of the excitation system, calculates the rotor circuit resistance value and converts it to the equivalent resistance value at the reference temperature, and then compares it with the preset reference resistance value. When the deviation exceeds the set threshold, an abnormal alarm signal is generated. Therefore, it can solve the problems of existing technologies that rely on manual periodic measurement, have long monitoring cycles, cannot monitor in real time, and do not consider the influence of ambient temperature, making it difficult to detect abnormal contact resistance in a timely manner and posing personal safety risks. It achieves the technical effects of real-time and accurate monitoring of the contact resistance status of the main contacts of the demagnetizing switch, eliminating the interference of ambient temperature on the measurement results, timely warning of poor contact faults, avoiding safety hazards for personnel measurement, and ensuring the safe, stable and continuous operation of hydropower plant units.

[0034] As a specific embodiment of this disclosure, based on the basic scheme, the embodiment of this disclosure further includes: monitoring the time-domain variation trend of the stator voltage setpoint and the measured stator voltage of the excitation system; when the time-domain variation trend is consistent and the difference is maintained within a preset allowable range, it is determined that the excitation system is in steady-state operation.

[0035] Specifically, the stator voltage setpoint is the total stator voltage setpoint of the excitation system (denoted as...). The measured stator voltage is the stator voltage sampled from the excitation system (denoted as ). ), through real-time data collection and For electrical signal data that varies with time, calculate the time-domain rate of change for both. and This is used to monitor whether the time-domain change trends of the two are consistent. When ( >0) and ( >0), or ( <0 and ( When <0), determine and The temporal variation trend is consistent; further calculations were then performed. and The difference ratio is preset to allow a range of ±2% (including boundary values). When the difference ratio is maintained within this range, it can be determined that the excitation system is in a steady-state operation, and then the subsequent acquisition process of output voltage and output current can be started.

[0036] By accurately monitoring the consistency and difference range of the stator voltage setpoint and the actual measured stator voltage change trend, the steady-state operation of the excitation system can be objectively and reliably determined, effectively eliminating interference in the non-steady-state operation stage. This ensures that the voltage and current data on which the subsequent resistance calculation depends are valid and accurate, providing a rigorous prerequisite for the entire contact resistance measurement process and further improving the reliability of the measurement results.

[0037] As a specific embodiment of this disclosure, based on the basic scheme, the consistency of the time-domain change trend is further defined as follows: the time-domain change rate of the given stator voltage value and the time-domain change rate of the measured stator voltage are both positive; or, the time-domain change rate of the given stator voltage value and the time-domain change rate of the measured stator voltage are both negative.

[0038] Specifically, the stator voltage setpoint is the total stator voltage setpoint of the excitation system (denoted as...). The measured stator voltage is the stator voltage sampled from the excitation system (denoted as ). (This is achieved by configuring a voltage sampling module to collect data in real time.) and For voltage data at continuous time points, calculate the time-domain rate of change of both at preset time intervals (e.g., millisecond intervals). and The time-domain rate of change is calculated as the ratio of the voltage difference between two adjacent time points to the time interval. A result greater than 0 indicates a positive rate of change, suggesting an upward trend in the corresponding voltage; a result less than 0 indicates a negative rate of change, suggesting a downward trend in the corresponding voltage. If detected... >0 and >0, meaning both are trending upwards, or <0 and If the value is less than 0, meaning both are decreasing, then the time-domain variation trend of the stator voltage setpoint is considered to be consistent with the measured stator voltage, thus satisfying the prerequisite for steady-state operation.

[0039] By clarifying the quantitative judgment criteria for consistent time-domain variation trends, the premise judgment of steady-state operation becomes more objective and operable, effectively avoiding the problem of false or missed start-ups caused by ambiguous judgment of variation trends. This ensures that subsequent monitoring processes are carried out only under the premise that the system voltage variation pattern is consistent, providing accurate pre-guarantee for the validity of subsequent resistance measurement data.

[0040] As a specific embodiment of this disclosure, based on the basic scheme, the step of converting the rotor circuit resistance value at the current ambient temperature to the equivalent resistance value at the reference temperature is further defined as follows: based on the linear relationship between conductor resistance and temperature, the rotor circuit resistance value is converted to the resistance value corresponding to the reference temperature according to a preset temperature conversion formula.

[0041] Specifically, the rotor circuit primarily uses copper conductors, and the resistance of copper conductors exhibits a stable linear relationship with ambient temperature. Based on this characteristic, a temperature conversion formula is pre-set to achieve temperature compensation of the resistance value. First, the current ambient temperature is collected in real time by a temperature sensor and recorded as follows: This temperature is the rotor circuit resistance value. The corresponding measured ambient temperature, of which It is based on Ohm's law and the acquired excitation voltage and excitation current The calculated value. The preset temperature conversion formula is: In the formula, 234.5 is the temperature coefficient correlation constant for copper conductors, and 75℃ is the preset reference temperature; the measured values ​​will be used to determine the temperature coefficient. and current ambient temperature By substituting the values ​​into the formula, the rotor circuit resistance at the current ambient temperature can be accurately converted into the equivalent resistance at the reference temperature (75°C). .

[0042] Based on the linear relationship between the resistance and temperature of copper conductors, temperature compensation of resistance values ​​is achieved through a clear temperature conversion formula. This can accurately eliminate the interference of ambient temperature fluctuations on the rotor circuit resistance measurement results, and provide a unified comparison benchmark for resistance data under different ambient temperatures. This significantly improves the accuracy and comparability of equivalent resistance values, and provides reliable data support for subsequent comparative analysis with benchmark resistance values ​​and fault diagnosis.

[0043] As a specific embodiment of this disclosure, based on the basic solution, the embodiment of this disclosure further includes: when generating the resistance abnormality alarm signal, simultaneously recording the current output voltage, output current, ambient temperature and the equivalent resistance value, and generating a monitoring report containing abnormal parameter information.

[0044] Specifically, when the deviation between the equivalent resistance value and the preset reference resistance value exceeds a set threshold, the system triggers a resistance abnormality alarm signal. Simultaneously, the preset data storage and report generation module synchronously performs parameter recording and report compilation operations. The synchronously recorded output voltage is the excitation voltage collected from the DC busbar of the excitation system. The output current is the excitation current measured in the rotor circuit through the resistor shunt. The ambient temperature is the current ambient temperature collected in real time. The equivalent resistance value is the rotor circuit resistance value converted to a reference temperature of 75℃. In addition, the system will record the precise timestamp of the anomaly. The monitoring report is compiled in a structured format, clearly listing the time of the anomaly, the name of each recorded parameter, its specific value and corresponding unit, and fully presenting the core operating data and resistance status information at the time of the anomaly, ensuring that the parameters are traceable and verifiable.

[0045] By synchronously recording key operating parameters when an anomaly occurs and generating monitoring reports containing anomaly information, the system provides maintenance personnel with complete fault tracing data. This helps them quickly reconstruct the system's operating status at the time of the anomaly, accurately pinpoint the cause of abnormal contact resistance in the main contacts of the demagnetizing switch, significantly improve the efficiency of fault diagnosis and handling, further reduce the risk of unit shutdown due to faults, and ensure the continuity and safety of hydropower plant operation.

[0046] It should be noted that the embodiments of this disclosure may include multiple steps. For ease of description, these steps are numbered, but these numbers are not a limitation on the execution time slots or execution order between the steps; these steps can be implemented in any order, and the embodiments of this disclosure do not limit this.

[0047] Corresponding to the above-described method for monitoring the contact resistance of a demagnetizing switch, this disclosure also proposes a device for monitoring the contact resistance of a demagnetizing switch. Since the device embodiments of this disclosure correspond to the method embodiments described above, details not disclosed in the device embodiments can be referred to the method embodiments described above, and will not be repeated here.

[0048] Figure 2 This is a schematic diagram of the structure of a contact resistance monitoring device for a demagnetizing switch provided in an embodiment of this disclosure, as shown below. Figure 2 As shown, it includes: The acquisition unit 21 is used to acquire the output voltage and output current of the excitation system in real time when the excitation system is in steady-state operation. The calculation unit 22 is used to calculate the rotor circuit resistance value based on the output voltage and the output current, and convert the rotor circuit resistance value at the current ambient temperature to the equivalent resistance value at the reference temperature; The generation unit 23 is used to compare the equivalent resistance value with a preset reference resistance value, and generate a resistance abnormality alarm signal when the deviation between the two exceeds a set threshold.

[0049] The field demagnetizing switch contact resistance monitoring device disclosed herein acquires the output voltage and output current in real time under steady-state operating conditions of the excitation system, calculates the rotor circuit resistance value and converts it to the equivalent resistance value at the reference temperature, and then compares it with the preset reference resistance value. When the deviation exceeds the set threshold, an abnormal alarm signal is generated. Therefore, it can solve the problems of existing technologies that rely on manual periodic measurement, have long monitoring cycles, cannot monitor in real time, and do not consider the influence of ambient temperature, making it difficult to detect abnormal contact resistance in a timely manner and posing personal safety risks. It achieves the technical effects of real-time and accurate monitoring of the contact resistance status of the main contacts of the field demagnetizing switch, eliminating the interference of ambient temperature on the measurement results, timely warning of poor contact faults, avoiding safety hazards for personnel measurement, and ensuring the safe, stable and continuous operation of hydropower plant units.

[0050] Furthermore, in one possible implementation of this embodiment, such as Figure 2 As shown, it also includes: The monitoring unit 24 is used to monitor the time-domain variation trend of the stator voltage setpoint and the measured stator voltage of the excitation system; when the time-domain variation trend is consistent and the difference is maintained within the preset allowable range, the excitation system is determined to be in steady-state operation.

[0051] Furthermore, in one possible implementation of this embodiment, the consistent time-domain variation trend includes: The time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are both positive. Alternatively, both the time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are negative.

[0052] Furthermore, in one possible implementation of this embodiment, the computing unit 22 is also used for: Based on the linear relationship between conductor resistance and temperature, the rotor circuit resistance value is converted to the resistance value corresponding to the reference temperature according to a preset temperature conversion formula.

[0053] Furthermore, in one possible implementation of this embodiment, such as Figure 2 As shown, it also includes: The recording unit 25 is used to simultaneously record the current output voltage, output current, ambient temperature and equivalent resistance value when the resistance abnormality alarm signal is generated, and to generate a monitoring report containing abnormal parameter information.

[0054] It should be noted that the foregoing explanation of the method embodiments also applies to the apparatus of this embodiment, and the principle is the same, so it is not limited in this embodiment.

[0055] According to embodiments of this disclosure, this disclosure also provides an electronic device, a readable storage medium, and a computer program product.

[0056] Figure 3 A schematic block diagram of an example electronic device 300 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0057] like Figure 3 As shown, the electronic device 300 includes a computing unit 301, which can perform various appropriate actions and processes based on a computer program stored in ROM (Read-Only Memory) 302 or a computer program loaded from storage unit 308 into RAM (Random Access Memory) 303. The RAM 303 may also store various programs and data required for the operation of the electronic device 300. The computing unit 301, ROM 302, and RAM 303 are interconnected via a bus 304. An I / O (Input / Output) interface 305 is also connected to the bus 304.

[0058] Multiple components in electronic device 300 are connected to I / O interface 305, including: input unit 306, such as keyboard, mouse, etc.; output unit 307, such as various types of displays, speakers, etc.; storage unit 308, such as disk, optical disk, etc.; and communication unit 309, such as network card, modem, wireless transceiver, etc. Communication unit 309 allows electronic device 300 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0059] The computing unit 301 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, CPUs (Central Processing Units), GPUs (Graphics Processing Units), various special-purpose AI (Artificial Intelligence) computing chips, various computing units running machine learning model algorithms, DSPs (Digital Signal Processors), and any suitable processor, controller, microcontroller, etc. The computing unit 301 performs the various methods and processes described above, such as the method for monitoring the contact resistance of a demagnetizing switch. For example, in some embodiments, the method for monitoring the contact resistance of a demagnetizing switch can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as storage unit 308. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 300 via ROM 302 and / or communication unit 309. When the computer program is loaded into RAM 303 and executed by the computing unit 301, one or more steps of the methods described above can be performed. Alternatively, in other embodiments, the computing unit 301 may be configured to perform the aforementioned demagnetizing switch contact resistance monitoring method by any other suitable means (e.g., by means of firmware).

[0060] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, FPGAs (Field Programmable Gate Arrays), ASICs (Application-Specific Integrated Circuits), ASSPs (Application-Specific Standard Products), SOCs (System-on-Chips), CPLDs (Complex Programmable Logic Devices), computer hardware, firmware, software, and / or combinations thereof. These various implementations may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0061] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0062] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, RAM, ROM, EPROM (Electrically Programmable Read-Only Memory) or flash memory, optical fiber, CD-ROM (Compact Disc Read-Only Memory), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0063] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (Cathode-Ray Tube) or LCD (Liquid Crystal Display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0064] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include LANs (Local Area Networks), WANs (Wide Area Networks), the Internet, and blockchain networks.

[0065] Computer systems can include clients and servers. Clients and servers are generally geographically separated and typically interact via communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. A server can be a cloud server, also known as a cloud computing server or cloud host, a hosting product within the cloud computing service system that addresses the shortcomings of traditional physical hosts and VPS (Virtual Private Server) services, such as high management difficulty and weak business scalability. Servers can also be servers for distributed systems or servers incorporating blockchain technology.

[0066] It's important to note that artificial intelligence (AI) is the study of enabling computers to simulate certain human thought processes and intelligent behaviors (such as learning, reasoning, thinking, and planning). It encompasses both hardware and software technologies. AI hardware technologies generally include sensors, dedicated AI chips, cloud computing, distributed storage, and big data processing. AI software technologies primarily include computer vision, speech recognition, natural language processing, machine learning / deep learning, big data processing, and knowledge graph technologies.

[0067] The various numerical designations such as "first," "second," etc., used in this disclosure are merely for ease of description and are not intended to limit the scope of the embodiments of this disclosure, nor do they indicate a sequential order.

[0068] At least one of the features described in this disclosure can also be described as one or more, and multiple features can be two, three, four or more, and this disclosure does not impose any limitations. In the embodiments of this disclosure, for a technical feature, the technical features in that technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", etc., and there is no sequential order or size order among the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0069] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0070] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for monitoring the contact resistance of a demagnetizing switch, characterized in that, include: Under steady-state operating conditions, the output voltage and output current of the excitation system are collected in real time. The rotor circuit resistance value is calculated based on the output voltage and the output current, and the rotor circuit resistance value at the current ambient temperature is converted to the equivalent resistance value at the reference temperature. The equivalent resistance value is compared with a preset reference resistance value. When the deviation between the two exceeds a set threshold, a resistance abnormality alarm signal is generated.

2. The method according to claim 1, characterized in that, Also includes: Monitor the time-domain variation trend of the stator voltage setpoint and the measured stator voltage of the excitation system; When the time-domain variation trend is consistent and the difference remains within a preset allowable range, the excitation system is determined to be in steady-state operation.

3. The method according to claim 2, characterized in that, The consistent time-domain variation trend includes: The time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are both positive. Alternatively, both the time-domain rate of change of the given stator voltage and the time-domain rate of change of the measured stator voltage are negative.

4. The method according to claim 1, characterized in that, The step of converting the rotor circuit resistance value at the current ambient temperature to the equivalent resistance value at the reference temperature includes: Based on the linear relationship between conductor resistance and temperature, the rotor circuit resistance value is converted to the resistance value corresponding to the reference temperature according to a preset temperature conversion formula.

5. The method according to claim 1, characterized in that, Also includes: When generating the resistance abnormality alarm signal, the current output voltage, output current, ambient temperature and the equivalent resistance value are recorded simultaneously, and a monitoring report containing abnormal parameter information is generated.

6. A device for monitoring the contact resistance of a demagnetizing switch, characterized in that, include: The acquisition unit is used to acquire the output voltage and output current of the excitation system in real time under the condition that the excitation system is in steady-state operation. The calculation unit is used to calculate the rotor circuit resistance value based on the output voltage and the output current, and convert the rotor circuit resistance value at the current ambient temperature to the equivalent resistance value at the reference temperature; The generation unit is used to compare the equivalent resistance value with a preset reference resistance value, and generate a resistance abnormality alarm signal when the deviation between the two exceeds a set threshold.

7. The apparatus according to claim 6, characterized in that, Also includes: The monitoring unit is used to monitor the time-domain variation trend of the stator voltage setpoint and the actual measured stator voltage of the excitation system. When the time-domain variation trend is consistent and the difference remains within a preset allowable range, the excitation system is determined to be in steady-state operation.

8. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-5.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-5.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method according to any one of claims 1-5.

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