High-voltage lightning arrester monitoring device

Abstract

The invention provides a high-voltage lightning arrester monitoring device, which relates to the technical field of lightning arrester monitoring and comprises a multi-dimensional composite sensor module, a microampere-level current monitoring module, a resistive current separation module, a data processing module and a display module. The multi-dimensional composite sensor module is used for collecting a leakage current signal of the lightning arrester in a high electromagnetic field environment; the microampere-level current monitoring module is used for performing microampere-level precision monitoring on the collected leakage current signal; the resistive current separation module is used for extracting a resistive current component from the leakage current signal; and the data processing module is used for performing data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current magnitude statistics, so as to realize pre-judgment of the service life of the lightning arrester. Through the multi-dimensional composite sensor technology and the microampere-level current monitoring technology, the leakage current of the lightning arrester can be monitored in real time, the resistive current component is accurately extracted, and the monitoring precision and real-time performance are improved.

Description

Technical Field

[0001] The invention relates to the technical field of lightning arrester monitoring, and in particular to a high-voltage lightning arrester monitoring device. Background Art

[0002] In the power system, high-voltage lightning arresters play a vital role. They are designed to protect power equipment from lightning overvoltage and operating overvoltage, thereby ensuring the stable operation of the power system. However, the performance status of the lightning arrester is directly related to its protection capability, so the monitoring of the lightning arrester is particularly important.

[0003] The traditional method of lightning arrester monitoring mainly relies on manual regular inspections and live detection. Specifically, although manual inspections can check the appearance and connection status of the lightning arrester, it is impossible to obtain the internal working status data of the lightning arrester in real time. In addition, the inspection cycle is long and it is difficult to find potential problems in time. Live detection needs to be carried out when the equipment is energized, which requires professional equipment and personnel to operate. Not only is the detection cost high, but there are also certain safety risks. Therefore, we have made improvements to this and proposed a high-voltage lightning arrester monitoring device. Summary of the invention

[0004] The purpose of the present invention is to address the problem that the existing traditional lightning arrester monitoring method mainly relies on manual regular inspection and live detection.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides a high-voltage lightning arrester monitoring device to improve the above-mentioned problem.

[0006] The specific application is as follows:

[0007] A high-voltage lightning arrester monitoring device, comprising a multi-dimensional composite sensor module, a micro-ampere current monitoring module, a resistive current separation module, a data processing module and a display module, wherein the multi-dimensional composite sensor module, the micro-ampere current monitoring module, the resistive current separation module and the display module are all connected to the data processing module;

[0008] The multi-dimensional composite sensor module is used to collect the leakage current signal of the arrester in a high electromagnetic field environment; the microampere current monitoring module is used to perform microampere-level precision monitoring on the collected leakage current signal;

[0009] The resistive current separation module is used to extract the resistive current component from the leakage current signal; the data processing module is used to perform data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current size statistics, so as to predict the service life of the lightning arrester; the display module is used to display the operating status of the lightning arrester and the data analysis results.

[0010] As a preferred technical solution of the present application, the multi-dimensional composite sensor module includes a plurality of sensor units for collecting leakage current signals.

[0011] As a preferred technical solution of the present application, the resistive current separation module uses a different frequency current method combined with the orthogonal characteristics of the resistive current and the capacitive current to extract the resistive current component.

[0012] The method of using the different frequency current method in combination with the orthogonal characteristics of the resistive current and the capacitive current to extract the resistive current component includes:

[0013] The composite leakage current signal including resistive current and capacitive current is collected in the working environment of the high-voltage lightning arrester by using a multi-dimensional composite sensor module, and a test current signal different from the power frequency is injected into the lightning arrester by using the different-frequency current method;

[0014] Based on the orthogonal characteristics of the resistive current and the capacitive current in phase, that is, the resistive current is in phase with the voltage, and the capacitive current is 90 degrees out of phase with the voltage, the resistive current component and the capacitive current component are separated by phase detection and signal processing technology. Specifically, a phase-locked loop or a phase-sensitive detector is used to detect the phase difference between the composite leakage current signal and the voltage signal, and the composite leakage current signal is decomposed into a resistive current component in phase with the voltage and a capacitive current component 90 degrees out of phase with the voltage by using the principle of orthogonal decomposition;

[0015] Use Fourier transform or digital filter to perform spectrum analysis on the collected composite leakage current signal to obtain current components at different frequencies. According to the orthogonal characteristics of resistive current and capacitive current in phase, calculate the amplitude and phase of the resistive current component. The specific calculation formula is as follows:

[0016] Resistive current component Ir = I*cos(θ);

[0017] Capacitive current component Im=I*sin(θ);

[0018] Where, I is the amplitude of the composite leakage current signal, θ is the phase difference between the composite leakage current signal and the voltage signal;

[0019] Finally, the resistive current component Ir is selected and output for analysis by the data processing module. The data processing module performs data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current size statistics, so as to predict the service life of the lightning arrester.

[0020] As a preferred technical solution of the present application, the data processing module is connected to a data synchronization capture and analysis module, which is used to synchronously and quickly capture ground leakage current, transient lightning current and transient overvoltage, and perform multi-source heterogeneous data analysis.

[0021] As a preferred technical solution of the present application, the display module includes a local display unit and a remote display unit. The local display unit is used to display the operating status and data analysis results of the lightning arrester on site, and the remote display unit is used to display the operating status and data analysis results of the lightning arrester on a remote terminal.

[0022] As a preferred technical solution of the present application, the data processing module is connected to a remote communication module, and the remote communication module is used to remotely transmit the monitoring data to a monitoring center and cooperate with a remote display unit to realize remote display.

[0023] As a preferred technical solution of this application, the data processing module uses the following calculation formula to calculate the discharge energy:

[0024] The power consumption of the arrester is P = I 2 R, where I is the resistive current component and R is the equivalent resistance of the arrester. The discharge energy E can be obtained by integrating the power consumption at different times, that is: E = ∫(t1→t2)Pdt = ∫(t1→t2)I2Rdt;

[0025] The equivalent resistance R of the arrester is calculated based on the measured total leakage current I and resistive current component I r It is calculated by the formula R = U / I = U / (Ir+Im), where U is the voltage across the arrester, I t is the total leakage current, I r is the resistive current component, I=I r +I m , I m is the capacitive current component.

[0026] As a preferred technical solution of the present application, the data processing module (1) calculates the estimated remaining service life T of the arrester according to the formula T=E / Pavg, where E is the discharged energy, P av g is the average power consumption, which is obtained by statistically averaging the power consumption within a certain period of time.

[0027] As a preferred technical solution of the present application, the microampere current monitoring module (3) calculates the current monitoring accuracy according to the formula ΔI=|I1-I2|, where I1 and I2 are leakage current values ​​measured twice in succession, and the microampere accuracy requirement is met when ΔI≤ε, where ε is a preset accuracy threshold.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] In the scheme of this application:

[0030] 1. This application uses multi-dimensional composite sensor technology and microampere current monitoring technology to monitor the leakage current of the arrester in real time and accurately extract the resistive current component, thereby improving the accuracy and real-time performance of monitoring;

[0031] 2. This application realizes the local display and remote online monitoring of the arrester's operating status. The operation and maintenance personnel can remotely view the arrester's operating status, reducing the workload of on-site inspections;

[0032] 3. This application realizes the prediction of the service life of the lightning arrester and the monitoring and early warning of the reliability of the grounding connection of the on-site equipment, which helps to timely discover and deal with potential faults and improve the safety of the equipment;

[0033] 4. It provides strong technical support for the intelligent operation and maintenance of the power system, which helps to improve the overall operation and maintenance level and management efficiency of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a high-voltage lightning arrester monitoring device provided for this application;

[0035] Figure 2 A schematic diagram of a display module of a high-voltage lightning arrester monitoring device provided in this application.

[0036] Indicated in the figure:

[0037] 1. Data processing module; 2. Multi-dimensional composite sensor module; 3. Microampere current monitoring module; 4. Resistive current separation module; 5. Display module; 501. Local display unit; 502. Remote display unit; 6. Data synchronization capture and analysis module; 7. Remote communication module. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] As described in the background technology, traditional lightning arrester monitoring methods mainly rely on manual regular inspections and live detection. Specifically, although manual inspections can check the appearance and connection status of the lightning arrester, it is impossible to obtain the internal working status data of the lightning arrester in real time. In addition, the inspection cycle is long, making it difficult to detect potential problems in a timely manner. Live detection needs to be performed when the equipment is energized, which requires professional equipment and personnel to operate. Not only is the detection cost high, but there are also certain safety risks.

[0040] In order to solve this technical problem, the present invention provides a high-voltage lightning arrester monitoring device, which is applied to the monitoring of high-voltage lightning arresters.

[0041] Specifically, please refer to Figure 1 , the high voltage arrester monitoring device specifically includes:

[0042] The multi-dimensional composite sensor module 2, the micro-ampere current monitoring module 3, the resistive current separation module 4, the data processing module 1 and the display module 5 are all connected to the data processing module 1;

[0043] The multi-dimensional composite sensor module 2 is used to collect the leakage current signal of the arrester in a high electromagnetic field environment; the microampere current monitoring module 3 is used to monitor the collected leakage current signal with microampere accuracy;

[0044] The resistive current separation module 4 is used to extract the resistive current component from the leakage current signal; the data processing module 1 is used to perform data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current size statistics, so as to predict the service life of the lightning arrester; the display module 5 is used to display the operating status of the lightning arrester and the data analysis results.

[0045] The high-voltage lightning arrester monitoring device provided by the present invention can monitor the leakage current of the lightning arrester in real time and accurately extract the resistive current component through multi-dimensional composite sensor technology and microampere current monitoring technology, thereby improving the monitoring accuracy and real-time performance.

[0046] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] Example 1, please refer to Figure 1 , a high-voltage lightning arrester monitoring device, comprising a multi-dimensional composite sensor module 2, a micro-ampere current monitoring module 3, a resistive current separation module 4, a data processing module 1 and a display module 5, wherein the multi-dimensional composite sensor module 2, the micro-ampere current monitoring module 3, the resistive current separation module 4 and the display module 5 are all connected to the data processing module 1;

[0050] The multi-dimensional composite sensor module 2 is used to collect the leakage current signal of the arrester in a high electromagnetic field environment; the microampere current monitoring module 3 is used to monitor the collected leakage current signal with microampere precision; the microampere current monitoring module 3 can accurately capture and measure the leakage current signal by adopting a high-precision current sensor and advanced signal processing technology. During the monitoring process, the microampere current monitoring module 3 first converts the leakage current signal into a measurable voltage or current signal, and then converts the analog signal into a digital signal through a high-precision analog-to-digital converter ADC. Finally, the digital signal is filtered, amplified and calibrated using a digital signal processing algorithm to ensure the accuracy and stability of the monitoring results. In this way, the microampere current monitoring module 3 can monitor the collected leakage current signal with microampere precision;

[0051] The resistive current separation module 4 is used to extract the resistive current component from the leakage current signal; the data processing module 1 is used to perform data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current size statistics, so as to predict the service life of the arrester; the display module 5 is used to display the operation status of the arrester and the data analysis results;

[0052] The extracted resistive current component can more accurately reflect the aging and failure of the arrester. By analyzing the resistive current component, the problems of the arrester's insulation performance degradation and internal moisture can be discovered in time, providing a scientific basis for the maintenance and replacement of the arrester. At the same time, it also helps to improve the reliability and safety of the power system and reduce power outages caused by arrester failures. Because the leakage current of the arrester is composed of resistive current and capacitive current, the resistive current component is closely related to the aging and failure of the arrester. By separating the resistive current component, data analysis can be performed more specifically, eliminating the interference of capacitive current, accurately judging the operating status of the arrester, and timely discovering the problems of the arrester so that corresponding maintenance measures can be taken to avoid further development of the fault and ensure the stable operation of the power system.

[0053] Furthermore, the multi-dimensional composite sensor module 2 includes multiple sensor units for collecting leakage current signals. Multiple sensor units can improve the reliability and accuracy of the collected signals. By collecting leakage current signals at different positions, the operating status of the lightning arrester can be more comprehensively understood. At the same time, the coordinated work of multiple sensor units also provides more information for fault diagnosis, which helps to improve the accuracy of fault location.

[0054] Embodiment 2 further optimizes the high-voltage arrester monitoring device provided in Embodiment 1. Specifically, the resistive current separation module 4 extracts the resistive current component by using a different-frequency current method combined with the orthogonal characteristics of the resistive current and the capacitive current;

[0055] The method of using the different frequency current method in combination with the orthogonal characteristics of the resistive current and the capacitive current to extract the resistive current component includes:

[0056] A composite leakage current signal including resistive current and capacitive current is collected in the working environment of the high-voltage lightning arrester by means of the multi-dimensional composite sensor module 2, and a test current signal different from the power frequency (usually 50 Hz or 60 Hz) is injected into the lightning arrester by means of the heterodyne current method. The test signal should have an obvious frequency difference so that the current component caused by the test signal can be distinguished from the composite leakage current signal. For example, a frequency much higher or much lower than the power frequency can be selected as the frequency of the test signal;

[0057] Based on the orthogonal characteristics of the resistive current and the capacitive current in phase, that is, the resistive current is in phase with the voltage, and the capacitive current is 90 degrees out of phase with the voltage, the resistive current component and the capacitive current component are separated by phase detection and signal processing technology. Specifically, a phase-locked loop or a phase-sensitive detector is used to detect the phase difference between the composite leakage current signal and the voltage signal, and the composite leakage current signal is decomposed into a resistive current component in phase with the voltage and a capacitive current component 90 degrees out of phase with the voltage by using the principle of orthogonal decomposition;

[0058] Use Fourier transform or digital filter to perform spectrum analysis on the collected composite leakage current signal to obtain current components at different frequencies. According to the orthogonal characteristics of resistive current and capacitive current in phase, calculate the amplitude and phase of the resistive current component. The specific calculation formula is as follows:

[0059] Resistive current component Ir = I*cos(θ);

[0060] Capacitive current component Im=I*sin(θ);

[0061] Where, I is the amplitude of the composite leakage current signal, θ is the phase difference between the composite leakage current signal and the voltage signal;

[0062] Finally, the resistive current component Ir is selected and output for analysis by the data processing module 1. The data processing module 1 performs data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current size statistics, so as to predict the service life of the lightning arrester.

[0063] The heterogeneous current method is a method for extracting resistive current components. It uses the current characteristics at different frequencies for separation; the orthogonal characteristics of resistive current and capacitive current: in AC circuits, resistive current and capacitive current have the characteristic of orthogonality, that is, a phase difference of 90 degrees, which means that in one cycle, when one reaches the maximum value, the other is zero, and vice versa; through the heterogeneous current method, current signals of different frequencies can be generated, and the current response of the lightning arrester at these frequencies can be measured. Then, the orthogonal characteristics of resistive current and capacitive current are used to separate the measured current signals to extract the resistive current component. This method can achieve accurate measurement of resistive current and provide important data for status monitoring of lightning arresters.

[0064] Further, such as Figure 1 As shown, the data processing module 1 is connected to a data synchronization capture and analysis module 6, which is used to synchronously and quickly capture the ground leakage current, transient lightning current and transient overvoltage, and perform multi-source heterogeneous data analysis to achieve monitoring and early warning of the reliability of the ground connection of field equipment; multi-source heterogeneous data analysis can more comprehensively understand the state of the ground connection and discover potential problems in time, which is helpful to improve the safety and reliability of the power system and reduce the risk of accidents caused by ground connection failures;

[0065] Signals such as ground leakage current, transient lightning current and transient overvoltage have an important impact on the reliability of the ground connection of field equipment. Synchronous capture of these signals can more accurately reflect the actual situation of the ground connection. Multi-source heterogeneous data analysis can comprehensively consider the characteristics of different signals and more comprehensively evaluate the status of the ground connection. If problems are discovered in time, corresponding maintenance measures can be taken to avoid accidents and improve the safety and reliability of the power system.

[0066] The data synchronization capture and analysis module 6 first receives various signals such as ground leakage current, transient lightning current and transient overvoltage in real time by connecting with the multi-dimensional composite sensor module 2, the microampere current monitoring module 3, etc., and collects different types of signals. In order to ensure the synchronization of data, the data synchronization capture and analysis module 6 adopts high-precision clock synchronization technology. For example, time synchronization can be performed through the global positioning system GPS clock or the network time protocol NTP to ensure that the acquisition timestamp of each signal is accurate; the different collected signals are time-aligned and adjusted to the same time axis according to the timestamps for subsequent joint analysis. A multi-source heterogeneous data analysis algorithm is used to analyze the synchronized ground leakage current, transient lightning current, transient overvoltage and other signals. In-depth analysis; according to the characteristics of different types of signals, specific mathematical models and algorithms are used for processing. For example, for transient lightning current, peak detection, waveform feature extraction and other methods can be used; for ground leakage current, steady-state analysis, harmonic analysis and the like can be performed; through comprehensive analysis of multiple signals, characteristic parameters related to the reliability of ground connection of field equipment are extracted, such as ground resistance change, current imbalance and the like; according to the characteristic parameters obtained by analysis, corresponding warning thresholds are set, and when the characteristic parameters exceed the warning thresholds, the module sends a monitoring warning signal; the warning signal can be displayed through the local display unit 501 and the remote display unit 502 of the display module 5, and can also be sent to the monitoring center through the remote communication module 7 so that relevant personnel can take timely measures.

[0067] Further, such as Figure 2 As shown, the display module 5 includes a local display unit 501 and a remote display unit 502. The local display unit 501 is used to display the operating status and data analysis results of the lightning arrester on site, and the remote display unit 502 is used to display the operating status and data analysis results of the lightning arrester on a remote terminal. Both local and remote display modes are provided, which is convenient for users to view the operating status and data analysis results of the lightning arrester in different occasions, thereby improving the convenience and flexibility of monitoring. The local display unit 501 allows on-site staff to understand the status of the lightning arrester in a timely manner so as to take corresponding measures. The remote display unit 502 allows managers to view the operating status and data analysis results of the lightning arrester on the remote terminal at any time, thereby realizing centralized management of lightning arresters at multiple locations.

[0068] Different users have different monitoring requirements for lightning arresters in different situations. The local display unit 501 meets the real-time monitoring needs of on-site staff, allowing them to discover problems and take measures in a timely manner. The remote display unit 502 provides management personnel with a means of remote monitoring, realizing centralized management of lightning arresters in multiple locations. This flexible display method improves the convenience of monitoring and management efficiency, and helps to ensure the safe operation of the power system.

[0069] Embodiment 3 further optimizes the high-voltage lightning arrester monitoring device provided in Embodiment 1 or 2. Specifically, Figure 1 As shown, the data processing module 1 is connected to a remote communication module 7, and the remote communication module 7 is used to remotely transmit the monitoring data to the monitoring center and cooperate with the remote display unit 502 to realize remote display. The remote communication module 7 realizes the remote transmission and centralized management of the monitoring data, improves the efficiency and reliability of monitoring, and cooperates with the remote display unit 502. The management personnel can view the operating status and data analysis results of the lightning arrester at any time on the remote terminal, and realize unified management of lightning arresters in multiple locations; this helps to discover problems in time and take corresponding measures to improve the safety and reliability of the power system.

[0070] Furthermore, the data processing module 1 calculates the discharge energy using the following calculation formula:

[0071] The power consumption of the arrester is P = I 2 R, where I is the resistive current component and R is the equivalent resistance of the arrester. The discharge energy E can be obtained by integrating the power consumption at different times, that is: E = ∫(t1→t2)Pdt = ∫(t1→t2)I2Rdt;

[0072] The equivalent resistance R of the arrester is calculated based on the measured total leakage current I and resistive current component I r It is calculated by the formula R = U / I = U / (Ir+Im), where U is the voltage across the arrester, I t is the total leakage current, I r is the resistive current component, I=I r +I m , I m is the capacitive current component;

[0073] By calculating the discharge energy, we can understand the energy consumption of the arrester during operation, and thus evaluate its aging degree and remaining life. This helps the power department to reasonably arrange maintenance and replacement plans and improve the reliability and economy of the power system. Because the life of the arrester is closely related to the discharge energy, calculating the discharge energy through the formula can more accurately reflect the actual operation of the arrester. The calculation of the equivalent resistance takes into account factors such as the total leakage current and the resistive current component, which improves the accuracy of the calculation. Predicting the life according to the discharge energy can provide a scientific basis for the power department, reasonably arrange maintenance and replacement plans, and avoid power outages caused by arrester failures. At the same time, it can also reduce maintenance costs and improve the economic benefits of the power system.

[0074] Furthermore, the data processing module 1 calculates the estimated remaining service life T of the arrester according to the formula T=E / Pavg, where E is the discharged energy and P is the residual energy.av g is the average power consumption, which is obtained by statistically averaging the power consumption within a certain period of time. The remaining service life of the lightning arrester is an important issue of concern to the power department. By calculating the estimated remaining service life, the power department can understand the remaining service life of the lightning arrester and reasonably arrange maintenance and replacement plans. The statistical average of the average power consumption can more accurately reflect the actual operation of the lightning arrester and improve the accuracy of the remaining life estimation.

[0075] Furthermore, the microampere current monitoring module 3 calculates the current monitoring accuracy according to the formula ΔI=|I1-I2|, where I1 and I2 are the leakage current values ​​measured twice in succession, and the microampere accuracy requirement is met when ΔI≤ε, where ε is a preset accuracy threshold; by calculating the leakage current values ​​measured twice in succession, the accuracy problem of the monitoring module can be discovered in time, and adjustments and optimizations can be made. The preset accuracy threshold ensures that the monitoring results meet the microampere accuracy requirements, thereby improving the accuracy and reliability of monitoring.

[0076] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A high voltage arrester monitoring device, characterized in that: It comprises a multi-dimensional composite sensor module (2), a micro-ampere current monitoring module (3), a resistive current separation module (4), a data processing module (1) and a display module (5); the multi-dimensional composite sensor module (2), the micro-ampere current monitoring module (3), the resistive current separation module (4) and the display module (5) are all connected to the data processing module (1); The multi-dimensional composite sensor module (2) is used to collect leakage current signals of lightning arresters in a high electromagnetic field environment; the microampere-level current monitoring module (3) is used to monitor the collected leakage current signals with microampere-level accuracy; The resistive current separation module (4) is used to extract the resistive current component from the leakage current signal; the data processing module (1) is used to perform data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current size statistics, so as to predict the service life of the lightning arrester; and the display module (5) is used to display the operation status of the lightning arrester and the data analysis results.

2. The high-voltage lightning arrester monitoring device according to claim 1, characterized in that: The multi-dimensional composite sensor module (2) comprises a plurality of sensor units for collecting leakage current signals.

3. The high-voltage lightning arrester monitoring device according to claim 1, characterized in that: The resistive current separation module (4) extracts the resistive current component by using a different frequency current method combined with the orthogonal characteristics of the resistive current and the capacitive current.

4. The high-voltage lightning arrester monitoring device according to claim 3, characterized in that: The method of using the different frequency current method in combination with the orthogonal characteristics of the resistive current and the capacitive current to extract the resistive current component includes: A composite leakage current signal including resistive current and capacitive current is collected in the working environment of the high-voltage lightning arrester by means of a multi-dimensional composite sensor module (2), and a test current signal different from the power frequency is injected into the lightning arrester by means of a different frequency current method; Based on the orthogonal characteristics of resistive current and capacitive current in phase, the resistive current component and the capacitive current component are separated through phase detection and signal processing technology; Use Fourier transform or digital filter to perform spectrum analysis on the collected composite leakage current signal to obtain current components at different frequencies. According to the orthogonal characteristics of resistive current and capacitive current in phase, calculate the amplitude and phase of the resistive current component. The specific calculation formula is as follows: Resistive current component Ir = I*cos(θ); Capacitive current component Im=I*sin(θ); Where, I is the amplitude of the composite leakage current signal, θ is the phase difference between the composite leakage current signal and the voltage signal; Finally, the resistive current component Ir is selected and output for analysis by the data processing module (1). The data processing module (1) performs data analysis on the extracted resistive current component, including discharge energy calculation, operation time statistics and leakage current size statistics, so as to predict the service life of the arrester.

5. The high-voltage lightning arrester monitoring device according to claim 1, characterized in that: The data processing module (1) is connected to a data synchronous capture and analysis module (6), and the data synchronous capture and analysis module (6) is used to synchronously and quickly capture the ground leakage current, transient lightning current and transient overvoltage, and perform multi-source heterogeneous data analysis.

6. The high-voltage lightning arrester monitoring device according to claim 1, characterized in that: The display module (5) comprises a local display unit (501) and a remote display unit (502), wherein the local display unit (501) is used to display the operating status and data analysis results of the lightning arrester on site, and the remote display unit (502) is used to display the operating status and data analysis results of the lightning arrester on a remote terminal.

7. The high-voltage lightning arrester monitoring device according to claim 1, characterized in that: The data processing module (1) is connected to a remote communication module (7), and the remote communication module (7) is used to remotely transmit the monitoring data to a monitoring center and cooperate with a remote display unit (502) to realize remote display.

8. The high voltage arrester monitoring device according to claim 4, characterized in that: The data processing module (1) calculates the discharge energy using the following calculation formula: The power consumption of the arrester is P = I 2 R, where I is the resistive current component and R is the equivalent resistance of the arrester. The discharge energy E can be obtained by integrating the power consumption at different times, that is: E = ∫(t1→t2)Pdt = ∫(t1→t2)I2Rdt; The equivalent resistance R of the arrester is calculated based on the measured total leakage current I and resistive current component I r It is calculated by the formula R = U / I = U / (Ir+Im), where U is the voltage across the arrester, I t is the total leakage current, I r is the resistive current component, I=I r +I m , I m is the capacitive current component.

9. The high-voltage lightning arrester monitoring device according to claim 1, characterized in that: The data processing module (1) calculates the estimated remaining service life T of the arrester according to the formula T=E / Pavg, where E is the discharged energy and P is av g is the average power consumption, which is obtained by statistically averaging the power consumption within a certain period of time.

10. The high-voltage lightning arrester monitoring device according to claim 1, characterized in that: The microampere current monitoring module (3) calculates the current monitoring accuracy according to the formula ΔI=|I1-I2|, wherein I1 and I2 are leakage current values ​​measured twice in succession, and the microampere accuracy requirement is met when ΔI≤ε, wherein ε is a preset accuracy threshold.

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