High voltage surge arrester monitoring device

Abstract

The application provides a high-voltage lightning arrester monitoring device, relates to the technical field of lightning arrester monitoring, and comprises a multidimensional composite sensor module, a microampere-level current monitoring module, a resistive current separation module, a data processing module and a display module; the multidimensional 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 size statistics, so as to realize the predication of the service life of the lightning arrester. Through multidimensional composite sensor technology and microampere-level current monitoring technology, the application can realize real-time monitoring of the leakage current of the lightning arrester, accurately extract the resistive current component, and improve the monitoring precision and real-time performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lightning arrester monitoring, in particular to a high-voltage lightning arrester monitoring device. BACKGROUND

[0002] In the power system, high-voltage lightning arresters play a crucial role, which are designed to protect power equipment from lightning overvoltage and operating overvoltage, so as to ensure the stable operation of the power system, however, the performance state of the lightning arrester is directly related to its protection ability, therefore, the monitoring of the lightning arrester is particularly important;

[0003] The traditional lightning arrester monitoring method mainly relies on artificial periodic inspection and live detection, specifically, although the artificial inspection can check the appearance and connection state of the lightning arrester, it cannot obtain the internal working state data of the lightning arrester in real time, and the inspection period is long, so it is difficult to find potential problems in time, and the live detection needs to be carried out under the condition that the equipment is live, which needs professional equipment and personnel to operate, not only the detection cost is high, but also there is a certain safety risk. Therefore, we improve it and propose a high-voltage lightning arrester monitoring device. SUMMARY

[0004] The purpose of the present application is to solve the problem that the traditional lightning arrester monitoring method mainly relies on artificial periodic inspection and live detection.

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

[0006] The present application is as follows:

[0007] The high-voltage lightning arrester monitoring device comprises a multi-dimensional composite sensor module, a micro-ampere level current monitoring module, a resistive current separation module, a data processing module and a display module, the multi-dimensional composite sensor module, the micro-ampere level current monitoring module, the resistive current separation module and the display module are connected with the data processing module.

[0008] The multi-dimensional composite sensor module is used for collecting the leakage current signal of the lightning arrester in a high electromagnetic field environment; the micro-ampere level current monitoring module is used for monitoring the collected leakage current signal with micro-ampere level precision;

[0009] The resistive current separation module is used for extracting the resistive current component from the leakage current signal; the data processing module is used for data analysis on the extracted resistive current component, including discharge energy calculation, running time statistics and leakage current size statistics, so as to realize the pre-judgment of the service life of the lightning arrester; the display module is used for displaying the running state of the lightning arrester and the data analysis result.

[0010] As a preferred technical solution of the present application, the multi-dimensional composite sensor module comprises 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 adopts an out-of-frequency current method to extract the resistive current component by combining the orthogonal characteristics of resistive current and capacitive current.

[0012] The resistive current component is extracted by combining the orthogonal characteristics of resistive current and capacitive current using an out-of-frequency current method, comprising:

[0013] By collecting the composite leakage current signals containing resistive current and capacitive current in the working environment of the high-voltage surge arrester through the multi-dimensional composite sensor module, a test current signal different from the power frequency is injected into the surge arrester using an out-of-frequency current method;

[0014] Based on the orthogonal characteristics of resistive current and capacitive current in phase, i.e., 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 using the principle of orthogonal decomposition.

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

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

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

[0018] Where I is the amplitude of the composite leakage current signal, and 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 data processing module analysis. The data processing module performs data analysis on the extracted resistive current component, including discharge energy calculation, running time statistics, and leakage current size statistics, to realize the pre-judgment of the service life of the surge arrester.

[0020] As a preferred technical solution of the present application, the data processing module is connected with a data synchronization capture and analysis module, which is used for synchronous and rapid capture of grounding leakage current, transient lightning current and transient overvoltage, and multi-source heterogeneous data analysis.

[0021] As a preferred technical solution of this 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 surge arrester on site, and the remote display unit is used to display the operating status and data analysis results of the surge arrester on a remote terminal.

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

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

[0024] The power consumption of the surge arrester is P=I r 2 R, where I r Let R be the resistive current component and R be the equivalent resistance of the surge arrester. The discharged energy E can be obtained by integrating the power dissipation at different times, i.e.: E = ʃ(t1→t2)Pdt = ʃ(t1→t2)I r 2 Rdt;

[0025] The equivalent resistance R of the surge arrester is based on the measured total leakage current I. t and resistive current component I r Using the formula R=U / I t= U / (I r +I m The calculation yields the result, where U is the voltage across the surge arrester, and I... t For the total leakage current, I r I is the resistive current component. t =I r +I m I m This is the capacitive current component.

[0026] As a preferred technical solution of this application, the data processing module (1) is based on the formula T=E / P avg Calculate the estimated remaining service life T of the surge arrester, where E is the energy already discharged, and P... avg The average power consumption is obtained by statistically averaging the power consumption over a certain period of time.

[0027] As a preferred technical solution of this application, the microampere-level current monitoring module (3) is based on the formula The accuracy of current monitoring is calculated, where I1 and I2 are the leakage current values ​​measured in two consecutive measurements. When ΔI≤ε, the accuracy requirement of microampere level is met, where ε is the preset accuracy threshold.

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

[0029] In the scheme of the application:

[0030] 1. The application can monitor the leakage current of the lightning arrester in real time through multi-dimensional composite sensor technology and micro-ampere current monitoring technology, and accurately extract the resistive current component, thereby improving the accuracy and real-time performance of the monitoring;

[0031] 2. The application realizes local display and remote online monitoring of the operating state of the lightning arrester, and the operation and maintenance personnel can remotely view the operating state of the lightning arrester, thereby reducing the workload of on-site inspection;

[0032] 3. The 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 device, which helps to discover and handle potential faults in time and improves the safety of the device;

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

[0034] Figure 1 A schematic diagram of the high-voltage lightning arrester monitoring device provided by the application;

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

[0036] Indicated in the figure:

[0037] 1, data processing module; 2, multi-dimensional composite sensor module; 3, micro-ampere 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 personnel in the art to better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the application.

[0039] As described in the background, the traditional monitoring method of lightning arresters mainly relies on artificial regular inspection and live detection, specifically, although artificial inspection can check the appearance and connection state of lightning arresters, it cannot obtain the internal working state data of lightning arresters in real time, and the inspection cycle is long, so it is difficult to discover potential problems in time, and live detection needs to be carried out under the condition that the equipment is live, which needs professional equipment and personnel to operate, not only the detection cost is high, but also there is a certain safety risk.

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

[0041] Specifically, please refer to Figure 1 The high-voltage lightning arrester monitoring device specifically comprises:

[0042] A multi-dimensional composite sensor module 2, a micro-ampere level 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 level current monitoring module 3, the resistive current separation module 4 and the display module 5 are all connected with the data processing module 1.

[0043] The multi-dimensional composite sensor module 2 is used for collecting a leakage current signal of the lightning arrester in a high electromagnetic field environment; the micro-ampere level current monitoring module 3 is used for monitoring the collected leakage current signal with micro-ampere level precision.

[0044] The resistive current separation module 4 is used for extracting a resistive current component from the leakage current signal; the data processing module 1 is used for performing data analysis on the extracted resistive current component, including discharge energy calculation, running time statistics and leakage current size statistics, so as to realize the pre-judgment of the service life of the lightning arrester; and the display module 5 is used for displaying the running state of the lightning arrester and the data analysis result.

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

[0046] In order to enable the personnel in the technical field to better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings.

[0047] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0048] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

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

[0050] The multi-dimensional composite sensor module 2 is used for collecting the leakage current signal of the arrester in a high electromagnetic field environment; the micro-ampere level current monitoring module 3 is used for monitoring the collected leakage current signal with micro-ampere level precision; the micro-ampere level current monitoring module 3 can realize accurate capture and measurement of the leakage current signal by adopting high-precision current sensors and advanced signal processing technology. In the monitoring process, the micro-ampere level current monitoring module 3 first converts the leakage current signal into measurable voltage or current signal, then converts the analog signal into digital signal through high-precision analog-to-digital converter ADC, and finally filters, amplifies and calibrates the digital signal by using digital signal processing algorithm to ensure the accuracy and stability of the monitoring result. In this way, the micro-ampere level current monitoring module 3 can realize micro-ampere level precision monitoring of the collected leakage current signal;

[0051] The resistive current separation module 4 is used for extracting the resistive current component from the leakage current signal; the data processing module 1 is used for data analysis of the extracted resistive current component, including discharge energy calculation, running time statistics and leakage current size statistics, to realize the pre-judgment of the service life of the arrester; the display module 5 is used for displaying the running state of the arrester and the data analysis result;

[0052] The extracted resistive current component can more accurately reflect the aging and failure of the arrester. Through the analysis of the resistive current component, the problems such as the decline of insulation performance and internal dampness of the arrester can be found in time, which provides a scientific basis for the maintenance and replacement of the arrester, and also helps to improve the reliability and safety of the power system and reduce power outages caused by arrester failure; 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, more targeted data analysis can be performed to exclude the interference of capacitive current, accurately judge the running state of the arrester, and take appropriate maintenance measures in time to avoid further development of the fault and ensure the stable operation of the power system.

[0053] Further, the multi-dimensional composite sensor module 2 includes a plurality of sensor units for collecting leakage current signals, which can improve the reliability and accuracy of signal collection. By collecting leakage current signals at different positions, the operating state of the surge arrester can be more comprehensively understood. Meanwhile, the cooperative work of the plurality of sensor units provides more information for fault diagnosis, which helps to improve the accuracy of fault location.

[0054] In embodiment 2, the resistive current separation module 4 is further optimized, and specifically, the resistive current component is extracted by using the hetero-frequency current method combined with the orthogonal characteristics of resistive current and capacitive current.

[0055] The resistive current component is extracted by using the hetero-frequency current method combined with the orthogonal characteristics of resistive current and capacitive current, which includes:

[0056] The multi-dimensional composite sensor module 2 collects the composite leakage current signal containing resistive current and capacitive current in the working environment of the high-voltage surge arrester. A test current signal different from the power frequency (usually 50 Hz or 60 Hz) is injected into the surge arrester by using the hetero-frequency current method. The test signal should have a significant frequency difference so as to distinguish the current component caused by the test signal 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 resistive current and capacitive current in phase, i.e., 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. 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] The collected composite leakage current signal is subjected to frequency spectrum analysis by using Fourier transform or digital filter to obtain current components at different frequencies. According to the orthogonal characteristics of resistive current and capacitive current in phase, the amplitude and phase of the resistive current component are calculated. The specific calculation formula is as follows:

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

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

[0061] Wherein, I is the amplitude of the composite leakage current signal, and 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 data processing module 1 analysis, and the data processing module 1 performs data analysis on the extracted resistive current component, including discharge energy calculation, running time statistics and leakage current size statistics, to realize the pre-judgment of the service life of the surge arrester.

[0063] The hetero-frequency current method is a method for extracting the resistive current component, which uses the current characteristics at different frequencies to separate; the orthogonal characteristics of resistive current and capacitive current: in an alternating current circuit, resistive current and capacitive current have orthogonal characteristics, i.e. phase difference of 90 degrees, which means that in a period, one reaches the maximum value while the other is zero, and vice versa; through the hetero-frequency current method, different frequency current signals can be generated, and the current response of the surge arrester at these frequencies can be measured, then, using the orthogonal characteristics of resistive current and capacitive current, the measured current signal is separated, and the resistive current component is extracted, this method can realize accurate measurement of resistive current, and provide important data for the state monitoring of surge arrester.

[0064] Further, as shown in Figure 1 The data processing module 1 is connected with a data synchronization grabbing and analysis module 6, which is used for synchronous and rapid grabbing of ground leakage current, transient lightning current and transient overvoltage, and multi-source heterogeneous data analysis, to realize the monitoring and early warning of the reliability of the field device grounding connection; multi-source heterogeneous data analysis can more comprehensively understand the state of the grounding connection, and timely find potential problems, which helps to improve the safety and reliability of the power system, and reduce the risk of accidents caused by grounding connection failure;

[0065] Ground leakage current, transient lightning current and transient overvoltage and other signals have important influence on the reliability of the field device grounding connection, synchronous grabbing of these signals can more accurately reflect the actual situation of the grounding connection, multi-source heterogeneous data analysis can comprehensively consider the characteristics of different signals, more comprehensively evaluate the state of the grounding connection, and timely find problems can take corresponding maintenance measures to avoid accidents, 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 micro-ampere level 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 a global positioning system (GPS) clock or a network time protocol (NTP), to ensure that the collection time stamps of various signals are accurate; the collected different signals are time-aligned, and they are adjusted to the same time axis according to the time stamps, so as to be jointly analyzed subsequently; a multi-source heterogeneous data analysis algorithm is adopted to deeply analyze the synchronized ground leakage current, transient lightning current and transient overvoltage signals; specific mathematical models and algorithms are used for processing according to the characteristics of different types of signals, 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 other methods can be used; through comprehensive analysis of various signals, characteristic parameters related to the reliability of the ground connection of the field device are extracted, such as ground resistance change, current unbalance degree, etc.; 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, as shown in Figure 2 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 state and data analysis results of the surge arrester on site, and the remote display unit 502 is used to display the operating state and data analysis results of the surge arrester on a remote terminal; both local and remote display modes are provided, which facilitates users to view the operating state and data analysis results of the surge arrester in different situations, improves the convenience and flexibility of monitoring, the local display unit 501 can enable on-site personnel to understand the situation of the surge arrester in time, so as to take appropriate measures, and the remote display unit 502 can enable managers to view the operating state and data analysis results of the surge arrester on a remote terminal at any time, realizing centralized management of surge arresters in multiple locations.

[0068] Different users have different monitoring needs for surge arresters in different situations, the local display unit 501 meets the real-time monitoring needs of on-site personnel, facilitating them to discover problems in time and take measures, and the remote display unit 502 provides a remote monitoring means for managers, realizing centralized management of surge arresters in multiple locations, this flexible display mode improves the convenience and management efficiency of monitoring, and helps to ensure the safe operation of the power system.

[0069] Example 3, the high-voltage surge arrester monitoring device provided in Example 1 or 2 is further optimized, in particular, as shown in Figure 1 The data processing module 1 is connected with a remote communication module 7, which is used for remotely transmitting the monitoring data to a monitoring center and cooperating with a remote display unit 502 to realize remote display. The remote communication module 7 realizes remote transmission and centralized management of the monitoring data, improves the efficiency and reliability of the monitoring, and cooperates with the remote display unit 502. The management personnel can view the running state of the surge arrester and the data analysis result on the remote terminal at any time, and realize unified management of the surge arrester in multiple places. This helps to discover problems in time and take corresponding measures, and improves the safety and reliability of the power system.

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

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

[0072] The equivalent resistance R of the surge arrester is calculated according to the measured total leakage current I t and the resistive current component I r , that is, R = U / I t= U / (I r + I m ), wherein U is the voltage across the surge arrester, I t is the total leakage current, I r is the resistive current component, I t = I r + I m , and I m is the capacitive current component;

[0073] By calculating the discharge energy, the energy consumption of the lightning arrester in the running process can be known, so as to evaluate the aging degree and the remaining life, which helps the power department to reasonably arrange the maintenance and replacement plan, and improves the reliability and economy of the power system; because the life of the lightning arrester is closely related to the discharge energy, the actual operation of the lightning arrester can be more accurately reflected by calculating the discharge energy, the calculation of the equivalent resistance considers factors such as the total leakage current and the resistive current component, and the accuracy of the calculation is improved, the life prediction is made according to the discharge energy, which can provide a scientific basis for the power department to reasonably arrange the maintenance and replacement plan, avoid power failure accidents caused by lightning arrester failure, and also can reduce the maintenance cost and improve the economic benefit of the power system.

[0074] Further, the data processing module 1 calculates the remaining service life estimation time T of the lightning arrester according to the formula T=E / P avg , wherein E is the discharged energy, P avg is the average power consumption, and the average power consumption is obtained by statistically averaging the power consumption in a certain period of time; the remaining service life of the lightning arrester is an important problem concerned by the power department, and by calculating the remaining service life estimation time, the power department can know the remaining service life of the lightning arrester and reasonably arrange the maintenance and replacement plan, and 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] Further, the microampere current monitoring module 3 calculates the current monitoring accuracy according to the formula , wherein I1 and I2 are the leakage current values measured continuously twice, and when ΔI≤ε, the microampere level accuracy requirement is met, wherein ε is a preset accuracy threshold; by calculating the leakage current values measured continuously twice, the accuracy problem of the monitoring module can be found in time and adjusted and optimized, and the preset accuracy threshold ensures that the monitoring result meets the microampere level accuracy requirement, and improves the accuracy and reliability of the monitoring.

[0076] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0077] Obviously, the above-described embodiments are only some embodiments but not all the embodiments of the present application, the preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be implemented in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or make equivalent replacements to some technical features therein. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A high-voltage surge arrester monitoring device, characterized in that, It includes a multidimensional composite sensor module (2), a microampere-level current monitoring module (3), a resistive current separation module (4), a data processing module (1), and a display module (5). The multidimensional composite sensor module (2), the microampere-level 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 multidimensional composite sensor module (2) is used to collect the leakage current signal of the surge arrester in a high electromagnetic field environment; the microampere-level current monitoring module (3) is used to perform microampere-level precision monitoring on the collected leakage current signal; 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 energy discharge calculation, running time statistics and leakage current magnitude statistics, so as to realize the prediction of the service life of the surge arrester; the display module (5) is used to display the operating status of the surge arrester and the data analysis results. The resistive current separation module (4) uses the different frequency current method to extract the resistive current component by combining the orthogonal characteristics of resistive current and capacitive current. The method of extracting the resistive current component by combining the orthogonal characteristics of resistive and capacitive currents using the heterogeneous current method includes: The multidimensional composite sensor module (2) collects a composite leakage current signal containing resistive current and capacitive current in the working environment of the high voltage arrester, and injects a test current signal different from the power frequency into the arrester using the heterofrequency current method. Based on the orthogonal phase characteristics of resistive and capacitive currents, phase detection and signal processing techniques are used to separate the resistive current component and the capacitive current component. The acquired composite leakage current signal is subjected to spectral analysis using Fourier transform or digital filters to obtain the current components at different frequencies. Based on the orthogonality of resistive and capacitive currents in phase, the amplitude and phase of the resistive current component are calculated. The specific calculation formulas are as follows: The resistive current component Ir = I*cos(θ); The capacitive current component Im = I*sin(θ); Where I is the amplitude of the composite leakage current signal, and 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 energy discharge calculation, running time statistics and leakage current magnitude statistics, so as to realize the prediction of the service life of the surge arrester. The data processing module (1) calculates the released energy using the following formula: The power consumption of the surge arrester is P=I r 2 R, where I r Let R be the resistive current component and R be the equivalent resistance of the surge arrester. The discharged energy E can be obtained by integrating the power dissipation at different times, i.e.: E = ʃ(t1→t2)Pdt = ʃ(t1→t2)I r 2 Rdt; The equivalent resistance R of the surge arrester is based on the measured total leakage current I. t and resistive current component I r Using the formula R=U / I t= U / (I r +I m The calculation yields the result, where U is the voltage across the surge arrester, and I... t For the total leakage current, I r I is the resistive current component. t =I r +I m I m This is the capacitive current component.

2. The high-voltage surge arrester monitoring device according to claim 1, characterized in that, The multidimensional composite sensor module (2) includes multiple sensor units for acquiring leakage current signals.

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

4. The high-voltage surge arrester monitoring device according to claim 1, characterized in that, 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 surge arrester on site, and the remote display unit (502) is used to display the operating status and data analysis results of the surge arrester on a remote terminal.

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

6. The high-voltage surge arrester monitoring device according to claim 1, characterized in that, The data processing module (1) is based on the formula T=E / P avg Calculate the estimated remaining service life T of the surge arrester, where E is the energy already discharged, and P... avg The average power consumption is obtained by statistically averaging the power consumption over a certain period of time.

7. The high-voltage surge arrester monitoring device according to claim 1, characterized in that, The microampere-level current monitoring module (3) is based on the formula The accuracy of current monitoring is calculated, where I1 and I2 are the leakage current values ​​measured twice consecutively. When ΔI≤ε, the accuracy requirement of microampere level is met, where ε is the preset accuracy threshold.

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