Electricity verification safety management and control method for lightning arrester leakage current monitoring meter and meter

Abstract

The invention provides an electricity verification safety management and control method for a lightning arrester leakage current monitoring meter and the meter, and the method comprises the steps: periodically collecting a leakage current signal generated by a lightning arrester connected to a high-voltage bus, and carrying out the analog-to-digital conversion of the leakage current signal, and generating a digital sampling signal; acquiring lightning arrester state evaluation parameters; the state evaluation parameters of the lightning arrester are remotely transmitted to a background monitoring system; and extracting a total current calculation result from the lightning arrester state evaluation parameters, comparing the total current calculation result with a preset electrification criterion, and determining the line electrification state of the high-voltage bus. According to the method, while the lightning arrester state evaluation parameters are remotely transmitted to the background monitoring system to realize remote state monitoring, the total current calculation result is extracted from the lightning arrester state evaluation parameters and is compared with the preset live-line criterion to determine the live-line state of the line for high-voltage electricity verification; the parallel multiplexing of the same sampling data stream between the remote monitoring function and the on-site electricity testing function is realized, and the data utilization efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of electrical safety management technology, and more specifically, to a method and meter for electrical safety management of a surge arrester leakage current monitoring meter. Background Technology

[0002] In modern power systems, surge arresters serve as critical overvoltage protection devices for high-voltage busbars and power equipment, and their long-term operational reliability directly impacts the safety and stability of the power grid. Under operating voltage, surge arresters generate microampere-level leakage currents. Parameters such as the total current, resistive current, capacitive current, and harmonic components of this leakage current can reflect the insulation condition, varistor losses, and internal defects of the surge arrester. Therefore, leakage current monitoring is an important means of assessing the health status of surge arresters. With the advancement of the construction of next-generation smart substations, higher demands are placed on the remote transmission, digital management, and integrated application of surge arrester monitoring data with the substation's secondary systems.

[0003] However, in existing technologies, surge arrester leakage current monitoring and high-voltage voltage detection anti-misoperation interlocking functions are independent and lack linkage. Traditional surge arrester monitoring meters only achieve local display or single data transmission remotely, and do not have the ability to use monitoring data for high-voltage voltage detection; while high-voltage voltage detection devices require additional induction probes or disruption of the surge arrester grounding circuit for sampling, resulting in low reliability, disruption of grounding integrity, and lack of mandatory interlocking function. The data from the two systems cannot be reused, leading to redundancy of field equipment, complex installation and commissioning, high operation and maintenance costs, and difficulty in achieving intelligent anti-misoperation interlocking control based on surge arrester status perception, failing to meet the technical requirements of substations for integrated and unified safety management. Summary of the Invention

[0004] The purpose of this application is to provide a method and meter for voltage detection safety management of a surge arrester leakage current monitoring meter, in order to solve the above-mentioned problems.

[0005] In a first aspect, embodiments of this application provide a method for voltage detection safety control of a surge arrester leakage current monitoring meter. The method includes: periodically acquiring leakage current signals generated by surge arresters connected to a high-voltage busbar, and generating digital sampling signals after analog-to-digital conversion; performing frequency domain transformation and feature extraction operations on the digital sampling signals to obtain surge arrester status evaluation parameters; remotely transmitting the surge arrester status evaluation parameters to a background monitoring system, so that the background monitoring system can perform insulation status evaluation and valve plate loss analysis based on the surge arrester status evaluation parameters; extracting the total current calculation results from the surge arrester status evaluation parameters, and comparing them with a preset energization criterion to determine the line energization state of the high-voltage busbar; wherein, the line energization state is used to determine the unlocking / locking state of the grounding interlocking mechanism.

[0006] In the implementation of the above scheme, while remotely transmitting the surge arrester status assessment parameters to the background monitoring system for remote status monitoring, the total current calculation results extracted from the surge arrester status assessment parameters are compared with the preset energization criteria to determine the line energization status for high-voltage testing. This achieves parallel multiplexing of the same sampled data stream between remote monitoring and on-site voltage testing functions, improving data utilization efficiency and device functional integration. On the other hand, by periodically collecting the surge arrester leakage current and generating digital sampling signals through analog-to-digital conversion, the signal undergoes frequency domain transformation and feature extraction to obtain status assessment parameters. While remotely transmitting data to the backend for insulation assessment and valve plate loss analysis, the total current calculation results are extracted and compared with preset energization criteria to determine the line's energization status. This achieves a deep integration of surge arrester status monitoring and high-voltage voltage detection and anti-misoperation interlocking functions, avoiding hardware redundancy and installation and debugging complexity caused by two independent devices in traditional solutions. Furthermore, the total current calculation results extracted from the status assessment parameters are compared with preset energization criteria to determine the line's energization status. This energization status is directly used to determine the unlocking and locking status of the grounding interlocking mechanism, enabling the voltage detection results to drive forced interlocking operations and improving the safety of grounding operations.

[0007] In one implementation of the first aspect, the method includes: in response to a voltage verification communication request initiated by an external computer key, sending the energized state of the line to the computer key, so that when the energized state of the line is that the line is energized, the computer key determines that the grounding interlocking mechanism on the grounding stake performs forced interlocking; wherein the grounding stake is a grounding stake in the line corresponding to preset identity information.

[0008] In the implementation of the above scheme, the energized status of the line is sent to the computer key in response to the voltage detection communication request initiated by the external computer key. Based on the preset identity information, the computer key controls the grounding interlocking mechanism on the corresponding grounding stake to perform forced interlocking when it determines that the line is energized. This achieves accurate matching and linkage control between the voltage detection information and the specific line grounding stake, preventing the risk of misoperation due to incorrect line identification. On the other hand, the computer key is used as an intermediate control unit to receive the energized status of the line and drive the grounding interlocking mechanism, directly converting the voltage detection result into a mechanical interlocking action. This forms a closed-loop control from status detection to physical interlocking, improving the response reliability of the energized interlocking.

[0009] In one implementation of the first aspect, the step of performing frequency domain transformation and feature extraction operations on the digital sampled signal to obtain arrester status evaluation parameters includes: performing a fast Fourier transform on the digital sampled signal and calculating the arrester status evaluation parameters using the third harmonic method; wherein, the arrester status evaluation parameters include the arrester's total current, resistive current, capacitive current, resistance-capacitance ratio, and harmonic parameters.

[0010] In the implementation of the above scheme, by performing a fast Fourier transform on the digital sampling signal and combining it with the third harmonic method, the resistive component and harmonic characteristics in the leakage current can be accurately extracted, providing accurate electrical characteristic data for the assessment of the surge arrester's insulation condition and the analysis of the valve plate loss. On the other hand, the obtained surge arrester condition assessment parameters include multi-dimensional electrical quantities such as total current, resistive current, capacitive current, resistance-capacitance ratio, and harmonic parameters, which can comprehensively reflect the surge arrester's insulation degradation, moisture absorption, and valve plate loss status from different characteristic dimensions, thus improving the comprehensiveness of the condition assessment.

[0011] In one implementation of the first aspect, the method further includes: generating a display driving signal based on the line energization state to drive the light-emitting diode to enter an alarm mode when the line energization state is that the line is energized.

[0012] In the implementation of the above solution, by generating a display drive signal based on the line's energized state to drive the light-emitting diode to enter the alarm mode when energized, maintenance personnel are provided with an on-site visual warning method independent of the background monitoring system and computer key, which improves the intuitiveness and real-time performance of energized state identification. On the other hand, by integrating the alarm display function into the surge arrester monitoring meter, the energized warning is localized, the warning information transmission path is shortened, and the safety and reliability of the device are improved in the event of communication abnormalities or external equipment failure.

[0013] Secondly, embodiments of this application provide a surge arrester leakage current monitoring meter, including a sampling circuit, a communication module, and a central processing unit, wherein the sampling circuit and the communication module are electrically connected to the central processing unit, wherein: The sampling circuit is configured to periodically acquire leakage current signals generated by surge arresters connected to the high-voltage busbar, generate digital sampling signals after analog-to-digital conversion, and send the digital sampling signals to the central processing unit. The central processing unit is configured to perform frequency domain transformation and feature extraction operations on the digital sampling signal to obtain surge arrester status assessment parameters; call the communication module to remotely transmit the surge arrester status assessment parameters to the background monitoring system, so that the background monitoring system can perform insulation condition assessment and valve loss analysis based on the surge arrester status assessment parameters; extract the total current calculation result from the surge arrester status assessment parameters and compare it with the preset energization criterion to determine the line energization state of the high-voltage busbar; wherein, the surge arrester status assessment parameters include surge arrester total current, resistive current, capacitive current, resistance-capacitance ratio and harmonic parameters; the line energization state is used to determine the unlocking and locking state of the grounding interlocking mechanism.

[0014] In one implementation of the second aspect, a voltage detection module electrically connected to the central processing unit is also included, the voltage detection module including a key interface and an ID chip; The voltage detection module is configured to receive a voltage detection communication request from an external computer key through the key interface, and send the line energization status to the computer key, so that the computer key drives the grounding locking mechanism on the grounding stake to perform forced locking when the line energization status is that the line is energized; wherein, the grounding stake is the grounding stake in the line corresponding to the preset identity information carried by the ID chip. The key interface is configured to be a single lever, blade, inlet, or outlet interface.

[0015] In the implementation of the above solution, by integrating a voltage detection module including a key interface and an ID chip, and configuring the key interface as a single pole, blade, inlet, or outlet interface, the voltage detection module can be adapted to various types of computer keys, improving the device's compatibility with external voltage detection equipment. On the other hand, by utilizing the preset identification information carried by the ID chip, the computer key controls the grounding interlocking mechanism on the corresponding grounding stake to perform forced interlocking when it determines that the line is energized. This achieves accurate matching and linkage control between the voltage detection result and the specific line grounding stake, preventing the risk of misoperation due to line identification errors.

[0016] In one implementation of the second aspect, a display module electrically connected to the central processing unit is further included. The display module includes a power indicator and a running status indicator. The display module is configured to drive the power indicator to flash in response to the line being energized; and to drive the running status indicator to remain constantly lit in response to the device operating state being normal.

[0017] In the implementation of the above solution, by configuring energized indicator lights and responding to the energized status of the line in a flashing manner, maintenance personnel are provided with an on-site visual warning method independent of the background monitoring system and computer key, which makes the energized status intuitively identifiable and improves the safety of on-site operations. On the other hand, by configuring operating status indicator lights and indicating the operating status of the device in a constant-on manner, maintenance personnel can keep abreast of the device's own working status in real time, which facilitates the timely detection of equipment abnormalities and improves the convenience and reliability of device operation and maintenance.

[0018] In one implementation of the second aspect, a signal conditioning module connected to the sampling circuit is further included. The signal conditioning module includes a voltage limiting circuit, a rectifier circuit, a sampling resistor, and a filter circuit, wherein: The voltage limiting circuit is configured to receive a leakage current input signal and clamp the leakage current input signal within the rated voltage range through a varistor, and output it to the rectifier circuit. The rectifier circuit is configured to perform full-bridge rectification on the signal from the voltage limiting circuit to convert it into a half-wave signal and output it to the sampling resistor; The sampling resistor is configured to convert the half-wave signal from the rectifier circuit into a voltage signal from a current form and send it to the filter circuit. The filtering circuit is configured to perform high-order harmonic filtering on the signal from the sampling resistor to retain third and lower harmonic signals, and output the signal to the sampling circuit.

[0019] In the implementation of the above scheme, the leakage current input signal is clamped within the rated voltage range by the varistor of the voltage limiting circuit, preventing overvoltage from damaging the subsequent rectifier circuit, sampling resistor, and filter circuit, thus improving the safety of the signal conditioning stage. The rectifier circuit performs full-bridge rectification to convert the signal into a half-wave signal, the sampling resistor converts the current signal into a voltage signal, and the filter circuit filters out higher harmonics and retains third and lower harmonic signals, thus completing signal form adaptation and frequency band purification step by step, providing a compliant input signal for the frequency domain transformation and feature extraction operations of the central processing unit. On the other hand, the filter circuit retains third and lower harmonic signals and filters out higher harmonics, providing a clean fundamental frequency band signal for fast Fourier transform and third harmonic method calculation, thus improving the accuracy of the surge arrester condition assessment parameters.

[0020] In one implementation of the second aspect, an electromagnetic valve plate counter electrically connected to the central processing unit is also included; the central processing unit is further configured to collect the number of lightning strikes of the surge arrester through the electromagnetic valve plate counter, and to call the communication module to transmit the number of lightning strikes to the background monitoring system.

[0021] In the implementation of the above scheme, the number of lightning strikes on the surge arrester is collected by an electromagnetic valve plate counter and the number is remotely transmitted to the background monitoring system. This realizes the automatic recording and centralized monitoring of lightning strike events, providing data basis for the status assessment of the surge arrester after being struck by lightning. On the other hand, the number of lightning strikes and leakage current monitoring data are transmitted together to the background monitoring system, enabling the background system to perform correlation analysis on the insulation status and valve plate loss changes of the surge arrester after being struck by lightning, thereby improving the comprehensiveness of the surge arrester status assessment.

[0022] Thirdly, embodiments of this application provide an electronic device, including: a processor, a memory, and a communication bus, wherein the processor and the memory communicate with each other through the communication bus; the memory stores computer program instructions that can be executed by the processor, and the computer program instructions are read and executed by the processor to perform the method provided in the first aspect or any possible implementation of the first aspect.

[0023] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A flowchart illustrating the voltage detection safety control method for a surge arrester leakage current monitoring meter provided in this application embodiment; Figure 2 This is a schematic diagram of the structure of the surge arrester leakage current monitoring meter provided in the embodiments of this application; Figure 3 This is a schematic diagram of the key interface of the voltage detection module provided in an embodiment of this application; Figure 4 A schematic diagram of the circuit interface of the signal conditioning module provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0027] For surge arrester leakage current monitoring, existing technologies mainly employ pointer-type or digital leakage current monitoring meters. These devices are typically installed in the surge arrester's grounding circuit, converting the leakage current into a voltage signal through an internal sampling resistor. After simple rectification and filtering, the signal drives the meter to display the total current value locally. While some improved products have added an RS485 communication interface to upload monitoring data to the auxiliary control system backend, their core functions remain limited to current monitoring and lightning strike counting, lacking high-voltage detection logic and thus unable to provide external results regarding energized status.

[0028] For high-voltage voltage detection, existing technologies mainly rely on two methods: The first method is inductive voltage detection, which requires the independent installation of an electric field induction probe below the high-voltage line or near the equipment. It indirectly determines whether the line is energized by detecting the intensity of the electric field in the space. This method is affected by factors such as ambient temperature, humidity, interference from nearby energized objects, and probe installation deviations, resulting in unstable induction accuracy and a tendency to produce false alarms or missed alarms. The second method is contact voltage detection, which requires maintenance personnel to disconnect the surge arrester's grounding flat iron on-site and install an open-type current transformer in the grounding circuit to collect leakage current to determine the energized state. This method not only compromises the integrity and reliability of the surge arrester's grounding circuit, posing safety hazards such as equipment overheating and grounding protection failure, but also suffers from poor sampling accuracy and low mechanical reliability of the open-type CT. Furthermore, it cannot achieve forced interlocking linkage with the grounding wire operating mechanism, making it difficult to fundamentally prevent the misoperation of connecting the grounding wire while energized.

[0029] The two independent systems described above have revealed the following major shortcomings in practical applications: First, functional fragmentation leads to high equipment redundancy, requiring separate installation of monitoring meters, induction probes, communication units, and voltage testing accessories on-site, increasing equipment costs and installation and commissioning workload. Second, data cannot be reused; surge arrester monitoring data is only used for equipment status assessment, and voltage testing data is only used for safety judgment; the two are not organically linked, resulting in low intelligence. Third, existing voltage testing methods either lack accuracy or damage the original equipment structure, and neither has a mandatory interlocking function, failing to meet the rigid requirements of power safety regulations for technical error prevention. These shortcomings severely restrict the technological requirements of the next generation of intelligent substations for the integrated, digital, and safety-integrated development of auxiliary equipment.

[0030] In view of this, this application provides a method for voltage detection safety management of a surge arrester leakage current monitoring meter. This method, while remotely transmitting surge arrester status assessment parameters to a background monitoring system for remote status monitoring, also extracts the total current calculation result from the surge arrester status assessment parameters and compares it with a preset energization criterion to determine the line's energization status for high-voltage voltage detection. This achieves parallel multiplexing of the same sampling data stream between remote monitoring and on-site voltage detection functions, improving data utilization efficiency and device functional integration. Furthermore, by periodically collecting surge arrester leakage current and generating digital sampling signals through analog-to-digital conversion, the method performs frequency domain transformation and feature extraction on the signals to obtain... By extracting state assessment parameters and remotely transmitting them to the backend for insulation assessment and valve plate loss analysis, the total current calculation results are extracted and compared with preset energization criteria to determine the line's energization status. This achieves a deep integration of surge arrester state monitoring and high-voltage voltage detection and anti-misoperation interlocking functions, avoiding the hardware redundancy and installation and debugging complexity caused by two independent devices in traditional solutions. Furthermore, the total current calculation results extracted from the state assessment parameters are compared with preset energization criteria to determine the line's energization status. This energization status is directly used to determine the unlocking and locking status of the grounding interlocking mechanism, enabling the voltage detection results to drive forced interlocking operations and improving the safety of grounding operations.

[0031] Please see Figure 1 The illustrated flowchart illustrates a voltage detection and safety management method for surge arrester leakage current monitoring meters provided in this application embodiment. This voltage detection and safety management method for surge arrester leakage current monitoring meters provided in this application embodiment can be applied to electronic devices. These electronic devices can include physical devices such as servers, PCs, tablets, or smartphones, or virtual devices such as virtual machines or containers. The electronic device can be a single device, a combination of multiple devices, or a cluster of a large number of devices. The aforementioned voltage detection and safety management method for surge arrester leakage current monitoring meters can include: Step S110: Periodically collect the leakage current signal generated by the surge arrester connected to the high-voltage bus, and generate a digital sampling signal after analog-to-digital conversion.

[0032] The aforementioned leakage current signal refers to the microampere-level conduction current generated by the varistor of a surge arrester under normal operating voltage during continuous operation. The leakage current signal is composed of a capacitive component and a resistive component. The capacitive component is generated by the equivalent capacitance of the surge arrester, while the resistive component originates from the nonlinear volt-ampere characteristic loss of the varistor. The magnitude, waveform, and harmonic components of the leakage current directly reflect the overall condition of the internal insulation medium of the surge arrester, the degree of varistor aging, moisture absorption, and the state of contamination accumulation. It is a core electrical characteristic quantity for assessing the operational health of the surge arrester.

[0033] Step S110 above can be performed using a surge arrester leakage current monitoring meter to acquire the leakage current signal. The surge arrester leakage current monitoring meter is connected in series to the surge arrester grounding circuit through a through-hole current transformer or a shunt sampling resistor to achieve electrical isolation and signal sampling. During the acquisition process, the leakage current signal first undergoes voltage limiting protection, full-wave rectification, and filtering processing by the meter's built-in signal conditioning module. Subsequently, a high-precision analog-to-digital converter performs periodic digital conversion at a preset sampling frequency to generate a discrete digital sampling signal sequence, which is then converted into a digital sampling signal after analog-to-digital conversion.

[0034] Step S120: Perform frequency domain transformation and feature extraction operations on the digital sampled signal to obtain the surge arrester status evaluation parameters.

[0035] The aforementioned frequency domain transformation refers to performing a Fast Fourier Transform (FFT) operation on the time-domain digitally sampled signal, mapping the discrete-time sequence signal to the frequency domain to obtain the amplitude and phase distribution information of the signal at each frequency component. The aforementioned feature extraction operation refers to the algorithmic process of further separating and calculating the fundamental wave, third harmonic, and their harmonic components in the leakage current using the third harmonic method, and extracting the resistive and capacitive current components, based on the frequency domain transformation. Through this operation, electrical characteristic quantities reflecting the nonlinear characteristics of the surge arrester can be extracted from the original sampled signal.

[0036] The aforementioned surge arrester condition assessment parameters refer to a quantitative electrical index system obtained by performing frequency domain transformation and feature extraction operations on digital sampled signals. This parameter system can characterize the surge arrester's insulation status, valve power consumption characteristics, and internal defect characteristics under continuous operating voltage, providing a data basis for surge arrester health status diagnosis.

[0037] Optionally, step S120 above may include: performing a fast Fourier transform on the digital sampled signal and calculating the arrester status assessment parameters using the third harmonic method; wherein, the arrester status assessment parameters include the arrester's total current, resistive current, capacitive current, resistance-capacitance ratio, and harmonic parameters.

[0038] The aforementioned Fast Fourier Transform (FFT) is an efficient algorithm for calculating the Discrete Fourier Transform (DFT). In digital signal processing, it can convert a discrete time-domain sampled sequence into a complex frequency-domain sequence, thereby obtaining the amplitude and phase spectrum distribution information of the signal at the fundamental frequency and each harmonic frequency, achieving quantitative separation and extraction of the signal's spectral components. The aforementioned Third Harmonic Method is a resistive current extraction algorithm based on the nonlinear volt-ampere characteristics of surge arrester valve elements. This method utilizes the spectral difference between the strong characteristics of resistive current in the third harmonic band and the near-zero third harmonic component of capacitive current. By extracting the amplitude and phase of the third harmonic component in the leakage current and performing vector operations in conjunction with the fundamental parameters, the resistive current component is separated from the total current, thereby accurately calculating the magnitude of the resistive current and the resistance-capacitance ratio parameter, providing key criteria for aging assessment of surge arrester valve elements.

[0039] The total current of the surge arrester mentioned above refers to the instantaneous value of the total leakage current flowing through its valve plate and internal insulating medium under continuous operating voltage. This current is the vector sum of the resistive current component and the capacitive current component, which can be directly measured in the time domain and is a basic parameter reflecting the overall electrical characteristics of the surge arrester.

[0040] The aforementioned resistive current refers to the active component in the leakage current of the surge arrester that is in phase with the applied voltage. This component is generated by the nonlinear volt-ampere characteristic of the valve plate, and its amplitude is directly related to the power loss of the valve plate. An increase in resistive current indicates that the valve plate is aging, damp, or heavily polluted, and it is the core characteristic quantity for judging the insulation deterioration of the surge arrester.

[0041] The aforementioned capacitive current refers to the reactive component in the leakage current of the surge arrester that lags behind the applied voltage by 90 degrees. This component is generated by the equivalent capacitance of the surge arrester, and its amplitude mainly depends on the geometric structure of the surge arrester and the dielectric constant of the internal insulating material. It is relatively stable under the normal operating conditions of the surge arrester and provides a phase reference for the extraction of resistive current.

[0042] The aforementioned resistance-capacitance ratio refers to the ratio of the amplitude of the resistive current to the capacitive current of the surge arrester. This ratio eliminates the influence of system voltage fluctuations and ambient temperature changes on the absolute value of the leakage current, and can more sensitively reflect the degree of change in the nonlinear characteristics of the valve plate. It is usually used as a normalized index for judging the condition of the surge arrester.

[0043] The aforementioned harmonic parameters refer to the set of amplitude and phase information of the fundamental wave, third harmonic, and all harmonic components contained in the leakage current of the surge arrester. Due to the nonlinear characteristics of the valve plate, the resistive current is rich in the third harmonic component, while the harmonic content of the capacitive current is extremely low. Therefore, the spectral distribution characteristics of the harmonic parameters provide a theoretical basis for the resistive current separation algorithm.

[0044] The above-mentioned scheme can accurately extract the resistive component and harmonic characteristics of the leakage current by performing a fast Fourier transform on the digital sampled signal and combining it with the third harmonic method. This provides accurate electrical characteristic data for the assessment of the surge arrester's insulation condition and the analysis of the valve plate loss. On the other hand, the obtained surge arrester condition assessment parameters include multi-dimensional electrical quantities such as total current, resistive current, capacitive current, resistance-capacitance ratio, and harmonic parameters. These parameters can comprehensively reflect the surge arrester's insulation degradation, moisture absorption, and valve plate loss from different characteristic dimensions, thus improving the comprehensiveness of the condition assessment.

[0045] Step S130: The surge arrester condition assessment parameters are remotely transmitted to the background monitoring system so that the background monitoring system can perform insulation condition assessment and valve plate loss analysis based on the surge arrester condition assessment parameters.

[0046] The aforementioned background monitoring system refers to a computer software platform deployed in the substation control room or remote dispatch center. This platform establishes a data connection with the leakage current monitoring meters of the surge arresters on-site via wired or wireless communication networks, receiving and storing surge arrester status assessment parameters from the monitoring meters. The background monitoring system has a built-in insulation condition assessment algorithm module and a valve plate loss analysis model. Based on the received total current, resistive current, capacitive current, resistance-capacitance ratio, and harmonic parameters, it can quantitatively assess the insulation status of the surge arresters, perform trend analysis on the aging degree of the valve plates, and conduct early diagnosis of internal defects. It also generates status evaluation reports, over-limit alarm information, and maintenance decision suggestions, realizing centralized monitoring and intelligent operation and maintenance management of surge arrester equipment.

[0047] The aforementioned background monitoring system uses a scheme to quantitatively assess the insulation status of surge arresters, for example, by establishing a multi-level criterion model based on resistive current amplitude and resistance-capacitance ratio parameters. When the resistive current exceeds 1.5 times the initial operating value and the resistance-capacitance ratio is greater than 0.25, it is determined to be an insulation abnormality warning state; when the resistive current exceeds 2.0 times the initial value and the resistance-capacitance ratio is greater than 0.35, it is determined to be an insulation degradation alarm state; and when the resistive current exceeds 3.0 times the initial value and the resistance-capacitance ratio is greater than 0.50, it is determined to be a serious defect emergency state. The system automatically generates alarm work orders of the corresponding level and pushes them to the operation and maintenance terminal to achieve quantitative and graded assessment of insulation status.

[0048] The aforementioned surge arrester leakage current monitoring meter achieves remote data transmission through an embedded communication module. This module integrates one or more hardware interface circuits, including an RS485 serial communication interface, a LoRa spread spectrum wireless transceiver unit, a WAPI wireless LAN protocol stack, or a StarSpark short-range wireless communication protocol controller. The communication module receives data frames generated by the central processing unit, containing surge arrester status assessment parameters and the number of lightning strikes. It encapsulates the data frames according to a preset communication protocol, adding checksums, timestamps, and device ID information to form standard messages conforming to DL / T860 or proprietary communication protocols. For wired transmission, the communication module sends messages to the station's communication management unit via an RS485 bus using master-slave response or active push methods, and then forwards them to the background monitoring system via an Ethernet switch and the power dispatch data network. For wireless transmission, the communication module constructs a self-organizing network using LoRa, WAPI, or StarSpark protocols, transmitting messages to the wireless access gateway via hop routing, and then delivering them to the background monitoring system via a security isolation device. The communication server of the background monitoring system continuously listens to the designated port, receives and parses the message content, and stores the surge arrester status assessment parameters and the number of lightning strikes into the real-time database and the historical database for subsequent insulation condition assessment, valve plate loss analysis and lightning strike count statistics, thereby completing the entire data transmission process from on-site monitoring to remote monitoring.

[0049] The aforementioned background monitoring system's approach to trend analysis of valve plate aging is as follows: An aging trend curve is constructed based on historical resistive current data stored in a time-series database. The least squares method is used to fit the slope of the resistive current increase over operating time. The increase in resistive current per unit time and the valve plate power consumption growth rate are calculated. When the slope exceeds a preset aging threshold, the valve plate is determined to have entered an accelerated aging stage. A multi-factor aging assessment model is established by combining operating years, lightning strike counts, and ambient temperature data to predict the remaining service life and generate condition-based maintenance recommendations.

[0050] The aforementioned background monitoring system employs the following scheme for early diagnosis of internal defects: A defect identification algorithm is established based on the spectral distribution characteristics of harmonic parameters. When the amplitude of the third harmonic component increases abnormally while the amplitude of the fundamental component does not reach the alarm threshold, it is determined to be a defect of localized moisture or dirt accumulation in the valve plate inside the surge arrester. When the ratio of the fifth harmonic component to the third harmonic component exceeds the normal fluctuation range, it is determined to be a defect of microstructural damage or partial discharge in the valve plate. When the harmonic phase angle deviates from the historical reference, it is determined to be a degradation of the internal insulation medium performance, thus achieving early defect identification before the insulation resistance significantly decreases.

[0051] Step S140: Extract the total current calculation results from the surge arrester status assessment parameters and compare them with the preset energization criteria to determine the energization status of the high-voltage busbar; wherein, the energization status of the line is used to determine the unlocking status of the grounding blocking mechanism.

[0052] The aforementioned preset energization criterion refers to a quantitative comparison threshold standard pre-set within the central processing unit. This criterion uses a fixed percentage of the rated leakage current value of the surge arrester as the benchmark criterion value, for example, it can be set to 15% of the rated leakage current value. During the energization state determination process, the central processing unit in the meter extracts the total current calculation result from the surge arrester state assessment parameters and compares it with the preset energization criterion in real time. When the total current calculation result is greater than or equal to the criterion value, the high-voltage busbar is determined to be in an energized state, generating an energized flag; otherwise, it is determined to be in an unenergized state, generating an unenergized flag. The preset energization criterion is set based on the steady-state leakage current characteristics of the surge arrester under continuous operating voltage. Through theoretical calculations and engineering experience verification, it ensures that within the rated voltage and normal fluctuation range of the busbar, the leakage current will not falsely trigger the energization determination. At the same time, it can reliably identify the busbar when it is actually energized, providing a quantitative and adjustable electrical judgment benchmark for high-voltage voltage detection, making the logical determination of the energized state have a clear engineering basis and repeatability.

[0053] Optionally, the above-mentioned method for voltage detection safety control of surge arrester leakage current monitoring meter may further include: responding to a voltage detection communication request initiated by an external computer key, sending the line energization status to the computer key, so that when the line energization status is line energized, the computer key determines that the grounding interlocking mechanism on the grounding stake performs forced interlocking; wherein, the grounding stake is the grounding stake in the line corresponding to the preset identity information.

[0054] The aforementioned "computer key" refers to a portable handheld terminal device used in the power five-prevention system to perform voltage testing and grounding interlocking control. This device integrates a microprocessor, an infrared communication module or a 2.4G wireless transceiver module, an authentication unit, and an LCD screen. It also pre-stores the topology of the substation's primary equipment, anti-misoperation logic rules, and operation ticket sequence information. In a voltage testing scenario, maintenance personnel insert the computer key into the voltage testing module key interface of the surge arrester leakage current monitoring meter. The computer key initiates a voltage testing communication request to the meter via infrared communication, 2.4G wireless communication, or switch signals. It receives the line energization status information returned by the meter and performs line matching verification based on the preset identity information provided by the voltage testing module's ID chip. When verification is successful and the line is energized, the computer key generates an interlocking control command according to the anti-misoperation logic rules, driving the electromagnetic interlocking mechanism on the corresponding grounding stake to maintain the locked state, preventing the grounding wire connection operation, thereby achieving forced interlocking linkage between the voltage testing result and the grounding operation.

[0055] The aforementioned preset identification information refers to the unique coded data stored in the ID chip of the voltage detection module. This information uses an RFID chip or EEPROM memory as the physical carrier, is permanently written at the factory and cannot be changed. Its coding rules follow the substation primary equipment naming specifications and the anti-misoperation interlocking system equipment coding standards, and can uniquely correspond to a specific high-voltage bus bay or surge arrester installation location. When the external computer key initiates a voltage detection communication request, the voltage detection module reads the identification information in the ID chip and transmits it to the computer key. The computer key uses this information to search and match the corresponding grounding stake number and anti-misoperation logic node in the pre-stored equipment topology database, thereby achieving accurate association between the voltage detection operation and the specific line grounding stake, preventing the grounding interlocking logic from failing due to incorrect identification of the voltage detection object.

[0056] The aforementioned grounding stake refers to a fixed grounding connection device installed on the high-voltage equipment area of ​​a substation or on the transmission line tower. This device consists of a grounding electrode, a metal stake body, a locking hole, and connecting terminals. It is reliably connected to the main grounding grid of the substation via a grounding down conductor, forming the physical bearing point for the temporary grounding wire. During the voltage verification and anti-misoperation process, maintenance personnel must connect a temporary grounding wire to the side of the line that has been verified to be de-energized. The grounding end of this temporary grounding wire must be reliably connected to the corresponding grounding stake to release residual charge on the line and provide safe grounding protection during the operation. The grounding stake number corresponds one-to-one with the primary equipment topology, and its location information and electrical attributes are pre-stored in the anti-misoperation logic database of the computer key. It is a key target device during the execution of the grounding operation ticket. The aforementioned grounding interlocking mechanism refers to an electromagnetic or mechanical locking device installed on the grounding stake body. This mechanism consists of an electromagnet, a locking tongue, a return spring, and a control circuit. Its control input terminal is electrically connected to the voltage verification result output terminal of the computer key. When the computer key receives a signal indicating that the line is energized, it sends a locking command to the grounding interlocking mechanism according to the anti-misoperation logic. The electromagnet is energized, causing the latch to extend and engage in the grounding stake's locking hole, preventing the insertion of the temporary grounding clamp and physically blocking the path of connecting the grounding wire while it is energized. When the line is de-energized, the electromagnet is de-energized and released, and the latch retracts under the action of the return spring, releasing the mechanical obstruction to the grounding clamp and allowing the grounding wire to be connected normally. This mechanism converts electrical voltage detection logic into a mechanical locking action, achieving a rigid interlocking function for technical anti-misoperation.

[0057] The above scheme sends the line's energized status to the computer key in response to a voltage detection communication request initiated by the external computer key. Based on preset identification information, the computer key controls the grounding interlocking mechanism on the corresponding grounding stake to perform forced interlocking when it determines that the line is energized. This achieves precise matching and linkage control between voltage detection information and specific line grounding stakes, preventing the risk of misoperation due to incorrect line identification. On the other hand, by using the computer key as an intermediate control unit to receive the line's energized status and drive the grounding interlocking mechanism, the voltage detection result is directly converted into a mechanical interlocking action, forming a closed-loop control from status detection to physical interlocking, thus improving the response reliability of energized interlocking.

[0058] Optionally, the above-mentioned method for voltage detection safety control of surge arrester leakage current monitoring meter may also include: generating a display drive signal based on the line energization status to drive the light-emitting diode to enter the alarm mode when the line is energized.

[0059] After determining the energized state of the line, a corresponding display drive signal can be generated based on the determination result. This signal is a pulse width modulation waveform with a specific duty cycle and frequency. When the line is determined to be energized, the central processing unit outputs the drive signal to the energized indicator control circuit. This circuit is connected to a high-brightness LED as a visually perceptible warning element. Under the action of the drive signal, the LED switches to a flashing alarm mode, that is, it alternately lights up and turns off at a preset frequency, visually conveying the warning information of the high-voltage busbar being energized to on-site maintenance personnel through dynamic light signals. This alarm mode is independent of the remote alarm and computer key interlocking logic of the background monitoring system, and can provide continuous visual warnings on-site. Even in the event of communication interruption or lack of external equipment access, it can still ensure the effective transmission of energized warning information, improving the safety redundancy capability of the device under complex operating conditions.

[0060] The above solution generates a display drive signal based on the line's energized state to drive the LED to enter alarm mode when energized, providing maintenance personnel with an on-site visual warning method independent of the background monitoring system and computer key, thus improving the intuitiveness and real-time performance of energized state identification. On the other hand, integrating the alarm display function into the surge arrester monitoring meter body realizes localized energized warning, shortens the warning information transmission path, and improves the safety and reliability of the device in the event of communication abnormalities or external equipment failure.

[0061] Please see Figure 2 Based on the same inventive concept, this application also provides a surge arrester leakage current monitoring meter 200, including a sampling circuit 210, a communication module 220, and a central processing unit 230. The sampling circuit 210 and the communication module 220 are electrically connected to the central processing unit 230, wherein: The sampling circuit 210 is configured to periodically acquire the leakage current signal generated by the surge arrester connected to the high-voltage bus, and generate a digital sampling signal after analog-to-digital conversion; and to send the digital sampling signal to the central processing unit 230. The central processing unit 230 is configured to perform frequency domain transformation and feature extraction operations on the digital sampled signal to obtain surge arrester status assessment parameters; call the communication module 220 to remotely transmit the surge arrester status assessment parameters to the background monitoring system, so that the background monitoring system can perform insulation condition assessment and valve loss analysis based on the surge arrester status assessment parameters; extract the total current calculation results from the surge arrester status assessment parameters and compare them with the preset energization criteria to determine the line energization status of the high-voltage busbar; wherein, the surge arrester status assessment parameters include the surge arrester total current, resistive current, capacitive current, resistance-capacitance ratio and harmonic parameters; the line energization status is used to determine the unlocking and locking status of the grounding interlocking mechanism.

[0062] It is understood that the above-mentioned central processing unit 230 can realize any one of the functions of the voltage detection safety control method for monitoring leakage current of surge arresters provided in the embodiments of this application. The method embodiment and the principle of realizing each function are described in the above-mentioned method embodiment, and will not be repeated in the device embodiment section.

[0063] Optionally, the above-mentioned surge arrester leakage current monitoring meter 200 may also include: A voltage detection module 240 electrically connected to a central processing unit 230 includes a key interface and an ID chip. The voltage detection module 240 is configured to receive a voltage detection communication request from an external computer key via a key interface, and send the line energization status to the computer key so that the computer key can drive the grounding locking mechanism on the grounding stake to perform forced locking when the line is energized; wherein, the grounding stake is the grounding stake in the line corresponding to the preset identity information carried by the ID chip. The key interface is configured to use a single lever, blade, inlet, or outlet interface.

[0064] The aforementioned voltage detection module 240 serves as the communication interface and status forwarding unit between the surge arrester leakage current monitoring meter and the external computer key. This module receives the voltage detection communication request initiated by the computer key through the key interface, obtains the line energization status determined by the central processing unit 230, and sends the status information to the computer key via infrared communication, 2.4G wireless communication, or switch signal transmission channel, driving the computer key to execute subsequent grounding interlocking control logic, thereby realizing the output and linkage of voltage detection results to external anti-misoperation equipment.

[0065] The aforementioned ID chip refers to a non-volatile memory chip embedded in the voltage detection module 240. This chip uses an RFID tag or electrically erasable programmable read-only memory as its physical carrier, and preset identification information is written into it before the device leaves the factory. This identification information follows the coding rules of substation primary equipment and uniquely corresponds to a specific high-voltage bus bay or surge arrester installation location. When the computer key is connected to the voltage detection module, the ID chip transmits the preset identification information to the computer key through the key interface, enabling the computer key to accurately match the line equipment targeted by the voltage detection request, ensuring that the correspondence between the line's energized state and the grounding stake interlocking mechanism is accurate.

[0066] The aforementioned key interface refers to the combination of mechanical structural components and circuit interfaces on the voltage detection module 240 used to establish a physical connection and electrical signal interaction with an external computer key. This interface is configured to support at least one of several interface types, including single-pole, blade, input, or output interfaces. It achieves data communication with the computer key through metal contacts or near-field wireless coupling, providing a physical layer and data link layer communication path for initiating voltage detection communication requests and transmitting the line's energized status. The key interface has two selectable installation configurations in terms of physical layout. The first configuration is an integrated installation, where the key interface is directly embedded inside the surge arrester leakage current monitoring meter, sharing the same housing structure with the display panel, central processing unit, and communication module. Electrical connection is achieved through internal circuit board wiring. The advantage of this configuration is its compact structure and high degree of integration, reducing external wiring and independent installation space requirements. It is suitable for newly built substations or for simultaneous implementation of monitoring and voltage detection functions during equipment replacement. The second configuration is a separate installation. The key interface is electrically isolated from the meter body through a standard communication interface. The communication interface adopts RS485, CAN bus, or StarScan wireless communication protocol. The key interface is installed as an independent functional module on the control box, junction box, or bracket of the adjacent meter. It establishes a data connection with the central processor through a shielded cable or wireless channel. The advantage of this configuration is its high flexibility. It can expand the functions on the basis of the existing traditional monitoring meter without replacing the original meter body to complete the addition of the voltage detection function. It is suitable for the intelligent transformation of existing substations. The communication interface can realize remote transmission of live status and voltage detection logic control, meeting the diverse needs of engineering applications.

[0067] Please see Figure 3The key interface can include a positioning rod electrode socket and an unlocking rod electrode socket. The positioning rod electrode socket and the unlocking rod electrode socket form a dual-rod mechanical plug-in structure. The electrode socket has built-in elastic metal contacts to form a conductive path with the corresponding electrode rod of the computer key, realizing power supply and switching signal transmission. The key interface also integrates an infrared emitting tube as a non-contact communication component, which sends the circuit energization status data to the computer key through infrared light signals, forming a dual redundant path of mechanical connection and wireless communication.

[0068] The above solution integrates a voltage detection module including a key interface and an ID chip, and configures the key interface as a single pole, blade, inlet, or outlet interface, enabling the voltage detection module to be compatible with various types of computer keys, thus improving the device's compatibility with external voltage detection equipment. On the other hand, by utilizing the preset identification information carried by the ID chip, the computer key controls the grounding interlocking mechanism on the corresponding grounding stake to perform forced interlocking when it determines that the line is energized. This achieves accurate matching and linkage control between the voltage detection result and the specific line grounding stake, preventing the risk of misoperation due to incorrect line identification.

[0069] Optionally, the above-mentioned surge arrester leakage current monitoring meter 200 may also include: a display module 250 electrically connected to the central processing unit 230, the display module 250 including a live indicator light and an operating status indicator light; The display module 250 is configured to drive the energized indicator light to flash in response to the line being energized; and to drive the operating status indicator light to remain constantly lit in response to the device operating status being normal.

[0070] The aforementioned display module 250 may include two types of LED warning elements: a live indicator light and a running status indicator light. The live indicator light is configured specifically for high-voltage busbar live warning, while the running status indicator light is configured specifically for indicating the device's own operating status. When the central processing unit 230 determines that the line is live, it generates a periodic pulse width modulation drive signal and outputs it to the display module 250. In response to this drive signal, the display module 250 controls the live indicator light to enter a flashing mode, that is, it alternately lights up and turns off at a preset frequency, directly conveying the warning information of high-voltage busbar liveness to on-site maintenance personnel through dynamic light signals. This flashing mode continues until the line live state changes to de-energized. When the device completes its self-test and the central processing unit 230 confirms that all hardware modules are working normally, it generates a continuous high-level drive signal and outputs it to the display module 250. In response to this signal, the display module 250 controls the running status indicator light to enter a constant-on mode, indicating that the device is in normal operating condition through a stable light signal, facilitating real-time monitoring of the equipment's operating status by maintenance personnel.

[0071] The above solution provides maintenance personnel with a visual warning method on-site, independent of the background monitoring system and computer key, by configuring energized indicator lights that flash in response to the energized status of the line. This allows for intuitive identification of the energized status and improves the safety of on-site operations. On the other hand, by configuring operating status indicator lights that remain constantly lit to indicate the operating status of the device, maintenance personnel can monitor the device's working status in real time, making it easier to detect equipment abnormalities in a timely manner and improving the convenience and reliability of device operation and maintenance.

[0072] Optionally, the above-mentioned surge arrester leakage current monitoring meter 200 may further include: a signal conditioning module 260 connected to the sampling circuit 210, the signal conditioning module 260 including a voltage limiting circuit, a rectifier circuit, a sampling resistor, and a filter circuit, wherein: The voltage limiting circuit is configured to receive the leakage current input signal and clamp the leakage current input signal within the rated voltage range through a varistor, and then output it to the rectifier circuit. The rectifier circuit is configured to perform full-bridge rectification on the signal from the voltage limiting circuit to convert it into a half-wave signal and output it to the sampling resistor; The sampling resistor is configured to convert the half-wave signal from the rectifier circuit into a voltage signal and send it to the filter circuit. The filtering circuit is configured to filter out higher harmonics from the signal from the sampling resistor to retain third and lower harmonic signals, and output the signal to the sampling circuit.

[0073] For example, see the implementation details of the signal conditioning module 260 described above. Figure 4The signal conditioning module 260 is connected in series in the surge arrester grounding circuit to perform multi-stage conditioning processing on the leakage current signal. The leakage current input signal first enters the voltage limiting circuit, which is composed of a varistor. When the instantaneous value of the input signal exceeds the varistor voltage threshold, the varistor conducts and clamps the signal amplitude within a safe voltage range to prevent damage to the subsequent rectifier circuit and sampling circuit from lightning overvoltage or operational overvoltage. The signal after voltage limiting protection is sent to the rectifier circuit, which uses a full-bridge rectifier topology composed of four rectifier diodes to perform full-wave rectification processing on the AC leakage current signal, converting it into a unidirectional pulsating half-wave signal to provide a unidirectional current path for the subsequent sampling resistor. The rectified half-wave signal flows through the sampling resistor, the resistance value of which is set according to the leakage current range. The current signal is linearly converted into a voltage signal by Ohm's law. The amplitude of the converted voltage signal is proportional to the leakage current and is then sent to the filter circuit. The filtering circuit uses a low-pass active filter or a passive LC filter network. Its cutoff frequency is designed to retain the third harmonic frequency and below. It attenuates and filters out high-frequency noise and high-order harmonic components in the voltage signal, and outputs a smooth fundamental and third harmonic frequency band voltage signal to the sampling circuit 210, thereby completing the complete conditioning process of leakage current signal voltage limiting protection, waveform rectification, current-to-voltage conversion and frequency band purification.

[0074] The above scheme clamps the leakage current input signal within the rated voltage range through the varistor of the voltage limiting circuit, preventing overvoltage damage to the subsequent rectifier circuit, sampling resistor, and filter circuit, thus improving the safety of the signal conditioning stage. The rectifier circuit performs full-bridge rectification to convert the signal into a half-wave signal, the sampling resistor converts the current signal into a voltage signal, and the filter circuit filters out higher harmonics while retaining third and lower harmonic signals. This step-by-step process completes signal form adaptation and frequency band purification, providing a compliant input signal for the frequency domain transformation and feature extraction operations of the central processing unit. On the other hand, the filter circuit retains third and lower harmonic signals and filters out higher harmonics, providing a clean fundamental frequency band signal for fast Fourier transform and third harmonic method calculations, thus improving the accuracy of the surge arrester condition assessment parameters.

[0075] Optionally, the above-mentioned surge arrester leakage current monitoring meter 200 may further include: a solenoid valve counter electrically connected to the central processing unit 230; The central processing unit 230 is also configured to collect the number of lightning strikes of the surge arrester through the solenoid valve plate counter, and call the communication module 220 to transmit the number of lightning strikes to the background monitoring system.

[0076] The aforementioned electromagnetic valve plate counter refers to a lightning strike count recording device installed in the grounding circuit of a surge arrester. This counter is built on the principle of electromagnetic induction and internally includes an induction coil, a magnet, a mechanical counting gear, and a pulse output interface. When the surge arrester is struck by lightning or subjected to an operational overvoltage, the discharged pulse current flows through the induction coil, generating a momentary strong magnetic field. This magnetic field drives the magnet to move and pushes the mechanical counting gear to rotate one position, completing the recording of one lightning strike. Simultaneously, the induction coil induces a pulse voltage signal during the magnetic field change. After processing by the shaping circuit, a standard square wave pulse is generated and transmitted through the pulse output interface to the interrupt input pin of the central processing unit or the counter input channel. In response to the interrupt trigger of this pulse signal, the central processing unit increments the value of the internally stored lightning strike count register. When the cumulative count reaches a preset threshold or at the periodic upload time, it calls the communication module 220 to encapsulate the lightning strike count data into a monitoring message and remotely transmits it to the background monitoring system. The background monitoring system can analyze the performance degradation trend of the surge arrester valve plate after multiple lightning strikes based on this count statistics and changes in leakage current parameters, determining whether preventative testing or replacement is necessary.

[0077] The above scheme collects the number of lightning strikes on the surge arrester by using an electromagnetic valve plate counter and remotely transmits this number to the back-end monitoring system, realizing automatic recording and centralized monitoring of lightning strike events, and providing data basis for the condition assessment of the surge arrester after being subjected to lightning strikes. On the other hand, transmitting the number of lightning strikes and leakage current monitoring data together to the back-end monitoring system enables the back-end to perform correlation analysis on the insulation status and valve plate loss changes of the surge arrester after being subjected to lightning strikes, thereby improving the comprehensiveness of the surge arrester condition assessment.

[0078] Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of this application. (Refer to...) Figure 5 The electronic device 300 includes a processor 310, a memory 320, and a communication interface 330. These components are interconnected and communicate with each other via a communication bus 340 and / or other forms of connection mechanism (not shown).

[0079] The memory 320 includes one or more (only one is shown in the figure), which may be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The processor 310 and other possible components may access the memory 320 to read and / or write data therein.

[0080] Processor 310 includes one or more (only one is shown in the figure), which can be an integrated circuit chip with signal processing capabilities. The processor 310 described above can be a general-purpose processor, including a central processing unit (CPU), a microcontroller unit (MCU), a network processor (NP), or other conventional processors; it can also be a special-purpose processor, including a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0081] Communication interface 330 includes one or more (only one is shown in the figure) that can be used to communicate directly or indirectly with other devices to exchange data. For example, communication interface 330 can be an Ethernet interface; it can be a mobile communication network interface, such as an interface for 3G, 4G, or 5G networks; or it can be other types of interfaces with data transmission and reception capabilities.

[0082] One or more computer program instructions may be stored in the memory 320. The processor 310 may read and run these computer program instructions to implement the voltage detection safety control method for surge arrester leakage current monitoring meter provided in the embodiments of this application, as well as other desired functions.

[0083] Understandable. Figure 5 The structure shown is for illustrative purposes only; the electronic device 300 may also include components that are more advanced than those shown. Figure 5 The more or fewer components shown, or having the same Figure 5 The different configurations shown. Figure 5 The components shown can be implemented using hardware, software, or a combination thereof. For example, electronic device 300 can be a single server (or other device with computing power), a combination of multiple servers, a cluster of a large number of servers, etc., and can be either a physical device or a virtual device.

[0084] This application also provides a computer-readable storage medium storing computer program instructions. These instructions are read and executed by a processor to perform the voltage detection safety control method for surge arrester leakage current monitoring meters provided in this application. For example, the computer-readable storage medium can be implemented as... Figure 5 The memory 320 in the electronic device 300, or a separate storage product (such as a USB flash drive, portable hard drive, etc.).

[0085] This application also provides a computer program product, which includes computer program instructions. These computer program instructions are read and executed by a processor to perform the voltage detection safety control method for surge arrester leakage current monitoring meters provided in this application. For example, these computer program instructions can be stored in... Figure 5 The memory 320 in the electronic device 300 is located inside the memory, or it is stored in a separate storage product (such as a USB flash drive, portable hard drive, etc.).

[0086] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for voltage detection and safety control of a surge arrester leakage current monitoring meter, characterized in that, The method includes: The leakage current signal generated by the surge arrester connected to the high-voltage busbar is periodically collected and converted into a digital sampling signal after analog-to-digital conversion; The digital sampled signal is subjected to frequency domain transformation and feature extraction operations to obtain the surge arrester status evaluation parameters; The surge arrester status assessment parameters are remotely transmitted to the background monitoring system so that the background monitoring system can perform insulation status assessment and valve plate loss analysis based on the surge arrester status assessment parameters. The total current calculation result is extracted from the surge arrester condition assessment parameters and compared with the preset energization criterion to determine the line energization state of the high-voltage busbar; wherein, the line energization state is used to determine the unlocking and unlocking state of the grounding interlocking mechanism.

2. The method for voltage detection and safety control of a surge arrester leakage current monitoring meter according to claim 1, characterized in that, The method includes: In response to a voltage verification communication request initiated by an external computer key, the energized status of the line is sent to the computer key, so that when the energized status of the line is that the line is energized, the computer key determines that the grounding interlocking mechanism on the grounding stake will perform forced interlocking; wherein, the grounding stake is the grounding stake in the line corresponding to the preset identity information.

3. The method for voltage detection and safety control of a surge arrester leakage current monitoring meter according to claim 1, characterized in that, The step of performing frequency domain transformation and feature extraction operations on the digital sampled signal to obtain surge arrester status evaluation parameters includes: The digital sampled signal is subjected to a Fast Fourier Transform, and the arrester status assessment parameters are calculated using the third harmonic method. The arrester status assessment parameters include the arrester's total current, resistive current, capacitive current, resistance-capacitance ratio, and harmonic parameters.

4. The method for voltage detection and safety control of a surge arrester leakage current monitoring meter according to any one of claims 1 to 3, characterized in that, The method further includes: A display driving signal is generated based on the line's energized state to drive the light-emitting diode to enter alarm mode when the line is energized.

5. A surge arrester leakage current monitoring meter, characterized in that, It includes a sampling circuit, a communication module, and a central processing unit (CPU). The sampling circuit and the communication module are electrically connected to the CPU, wherein: The sampling circuit is configured to periodically acquire leakage current signals generated by surge arresters connected to the high-voltage busbar, generate digital sampling signals after analog-to-digital conversion, and send the digital sampling signals to the central processing unit. The central processing unit is configured to perform frequency domain transformation and feature extraction operations on the digital sampling signal to obtain surge arrester status assessment parameters; call the communication module to remotely transmit the surge arrester status assessment parameters to the background monitoring system, so that the background monitoring system can perform insulation condition assessment and valve loss analysis based on the surge arrester status assessment parameters; extract the total current calculation result from the surge arrester status assessment parameters and compare it with the preset energization criterion to determine the line energization state of the high-voltage busbar; wherein, the surge arrester status assessment parameters include surge arrester total current, resistive current, capacitive current, resistance-capacitance ratio and harmonic parameters; the line energization state is used to determine the unlocking and locking state of the grounding interlocking mechanism.

6. The surge arrester leakage current monitoring meter according to claim 5, characterized in that, It also includes a voltage detection module electrically connected to the central processing unit, the voltage detection module including a key interface and an ID code chip; The voltage detection module is configured to receive a voltage detection communication request from an external computer key through the key interface, and send the line energization status to the computer key, so that the computer key drives the grounding locking mechanism on the grounding stake to perform forced locking when the line energization status is that the line is energized; wherein, the grounding stake is the grounding stake in the line corresponding to the preset identity information carried by the ID chip. The key interface is configured to be a single lever, blade, inlet, or outlet interface.

7. The surge arrester leakage current monitoring meter according to claim 5, characterized in that, It also includes a display module electrically connected to the central processing unit, the display module including a power indicator and a running status indicator; The display module is configured to drive the energized indicator light to flash in response to the line being energized; and to drive the operating status indicator light to remain constantly lit in response to the device operating status being normal.

8. The surge arrester leakage current monitoring meter according to claim 5, characterized in that, It also includes a signal conditioning module connected to the sampling circuit, the signal conditioning module comprising a voltage limiting circuit, a rectifier circuit, a sampling resistor, and a filter circuit, wherein: The voltage limiting circuit is configured to receive a leakage current input signal and clamp the leakage current input signal within the rated voltage range through a varistor, and output it to the rectifier circuit. The rectifier circuit is configured to perform full-bridge rectification on the signal from the voltage limiting circuit to convert it into a half-wave signal and output it to the sampling resistor; The sampling resistor is configured to convert the half-wave signal from the rectifier circuit into a voltage signal from a current form and send it to the filter circuit. The filtering circuit is configured to perform high-order harmonic filtering on the signal from the sampling resistor to retain third and lower harmonic signals, and output the signal to the sampling circuit.

9. The surge arrester leakage current monitoring meter according to claim 5, characterized in that, It also includes a solenoid valve counter electrically connected to the central processing unit; The central processing unit is also configured to collect the number of lightning strikes of the surge arrester through the solenoid valve plate counter, and to call the communication module to transmit the number of lightning strikes to the background monitoring system.

10. An electronic device, characterized in that, include: A processor, a memory, and a communication bus, wherein the processor and the memory communicate with each other via the communication bus; The memory stores program instructions that can be executed by the processor, and the processor can execute the method as described in any one of claims 1 to 4 by calling the program instructions.

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