A digitized lightning arrester monitor and a working method thereof

Abstract

The application discloses a kind of digital lightning arrester monitor and working method thereof, including voltage limiting protection valve piece, voltage divider, power frequency current isolation circuit, rectifier bridge, switching circuit, mechanical meter and counter, MCU and driver;When monitor is power off, switching circuit is switched to rectifier bridge by mechanical meter and counter, so that monitor is provided with the pointer display leakage current of mechanical lightning arrester monitor, counter carries out lightning action record function;When monitor is electrified, leakage current is collected by power frequency current isolation circuit, valve piece voltage waveform is collected by voltage divider, and MCU is measured and calculated according to leakage current value to drive mechanical meter, and according to voltage threshold value, it is judged to drive counter Lightning strike;Using the monitor can effectively take power for high potential when series gap zinc oxide lightning arrester acts, so as to realize the timely monitoring of impulse current;It is suitable for the occasion of series gap zinc oxide lightning arrester high potential action monitoring, and has good popularization and application value.

Description

Technical Field

[0001] This invention belongs to the field of online monitoring technology, specifically relating to a digital surge arrester monitor and its operating method. Background Technology

[0002] Among various lightning protection measures, gapless zinc oxide surge arresters have become the main equipment for overvoltage protection in power systems due to their nonlinear characteristics. However, due to problems such as poor sealing and surge arrester aging during actual operation, zinc oxide surge arresters are subject to certain operational risks. If these risks are not eliminated in time, they may lead to surge arrester breakdown, explosion, or other dangers. Therefore, continuous monitoring of the operating status of surge arresters is essential.

[0003] Currently, mechanical surge arrester monitors are used in engineering projects. These monitors display the leakage current magnitude via pointers and the number of arrester trips via counters. They lack remote data transmission capabilities and rely solely on maintenance personnel periodically recording data, resulting in poor real-time performance. To address this issue, a rudimentary digital design for surge arrester monitors has emerged, but issues such as power supply reliability and the reliance on on-site reading habits by maintenance personnel remain. When the digital surge arrester monitor loses power, it must still maintain the original functionality of the mechanical monitor; on-site maintenance personnel need to maintain the local reading method of the mechanical monitor. Therefore, it is necessary to resolve the consistency issues between the pointer-type leakage current readings and the digital measurement data, as well as the problem of driving the electromagnetic counter in the digital monitor.

[0004] Therefore, it is evident that existing monitoring methods cannot meet the requirements of digital surge arrester monitoring, offline measurement function during power failure, and retention of readings from the original mechanical monitors. Summary of the Invention

[0005] To overcome the above-mentioned technical defects, the present invention provides a digital surge arrester monitor and its working method, which can solve the technical problem that existing monitoring methods cannot meet the requirements of digital surge arrester monitoring, offline measurement function in the event of power failure, and retention of the original mechanical monitor reading method.

[0006] To achieve the above objectives, the present invention employs the following technical content:

[0007] A digital surge arrester monitor includes a pressure-limiting protective valve plate;

[0008] The pressure limiting protection valve is installed at the lower end of the surge arrester and connected to the ground.

[0009] The pressure limiting protection valve plate is connected to a pressure divider at both ends;

[0010] The voltage divider is connected in parallel with a rectifier bridge, a switching circuit, and a mechanical meter and counter at its two ends.

[0011] A power frequency current isolation circuit is connected between the voltage divider and the rectifier bridge.

[0012] The output terminals of the voltage divider and the power frequency current isolation circuit are respectively connected to the MCU;

[0013] The MCU controls the switching circuit and the mechanical meters and counters via a driver;

[0014] When the digital surge arrester monitor is powered on, the switching circuit can switch the mechanical meters and counters to the output of the driver. The leakage current is transmitted to the MCU through the power frequency current isolation circuit, and then the driver causes the mechanical meters and counters to indicate according to the measured current value. The voltage divider transmits the voltage waveform of the voltage limiting protection valve to the MCU for calculation and judgment. When the absolute value of the voltage exceeds the threshold, it is determined that a lightning strike has occurred, and the driver drives the counters of the mechanical meters and counters to operate once.

[0015] When the digital surge arrester monitor loses power, the switching circuit can switch the mechanical meters and counters to the output of the rectifier bridge, so that the mechanical meters and counters are directly driven by the leakage current and the energy of the lightning strike.

[0016] Furthermore, the power frequency current isolation circuit is connected to the MCU through a steady-state acquisition circuit.

[0017] Furthermore, the voltage divider is connected to the MCU via a transient acquisition circuit.

[0018] Furthermore, the MCU is also connected to a data storage module for storing historical data on leakage current and number of operations, as well as a communication module for communicating with a host computer.

[0019] Furthermore, the pressure limiting protection valve plate is a zinc oxide valve plate.

[0020] Furthermore, the voltage divider includes a high-voltage arm resistor and a low-voltage arm resistor, and the potential of the high-voltage arm resistor can be proportionally converted to that of the low-voltage arm resistor.

[0021] Furthermore, the power frequency current isolation circuit employs a power frequency isolation transformer to isolate and collect leakage current waveforms.

[0022] Furthermore, the switching circuit includes two sets of switching switches. The first set of switching switches is used to switch the mechanical meters and counters to the output terminal of the driver, and the second set of switching switches is used to switch the mechanical meters and counters to the output terminal of the rectifier bridge.

[0023] Furthermore, the mechanical meter and counter include a mechanical meter and a counter; the mechanical meter is a pointer-type ammeter used to indicate the leakage current of the surge arrester according to the pointer and scale; the counter is an electromagnetic counter used for counting actions.

[0024] A method for operating a digital surge arrester monitor, based on the aforementioned digital surge arrester monitor, includes:

[0025] When the digital surge arrester monitor is powered on, the switching circuit switches the mechanical meters and counters to the output of the driver. The leakage current is transmitted to the MCU through the power frequency current isolation circuit, and then the driver causes the mechanical meters and counters to indicate according to the measured current value. The voltage divider transmits the voltage waveform of the voltage limiting protection valve to the MCU for calculation and judgment. When the absolute value of the voltage exceeds the threshold, it is determined that a lightning strike has occurred, and the driver drives the counters of the mechanical meters and counters to operate once.

[0026] When the digital surge arrester monitor loses power, the switching circuit switches the mechanical meters and counters to the output of the rectifier bridge, so that the mechanical meters and counters are directly driven by the leakage current and the energy of the lightning strike.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] This invention provides a digital surge arrester monitor, which includes a voltage limiting protection valve, a voltage divider, a power frequency current isolation circuit, a rectifier bridge, a switching circuit, mechanical meters and counters, an MCU, and a driver. When the monitor is de-energized, the switching circuit switches the mechanical meters and counters to the rectifier bridge, enabling the monitor to display leakage current as a pointer and record lightning strike actions as a mechanical surge arrester monitor. When the monitor is energized, the power frequency current isolation circuit collects leakage current, the voltage divider collects the valve voltage waveform, the MCU measures and calculates the leakage current value to drive the mechanical meters, and the voltage threshold is used to determine a lightning strike and drive the counter. This monitor can effectively extract power from the high potential during the operation of a series gap zinc oxide surge arrester, thereby achieving timely monitoring of the impulse current. It is suitable for high-potential operation monitoring of series gap zinc oxide surge arresters and has good application value.

[0029] Preferably, in this invention, the power frequency current isolation circuit is connected to the MCU through a steady-state acquisition circuit, which converts the analog leakage current into a digital value. The voltage divider is connected to the MCU through a transient acquisition circuit, which converts the analog valve voltage waveform into a digital value, thus ensuring stable signal sampling. Furthermore, the MCU acquires the valve voltage through the voltage divider and the transient acquisition circuit, and determines whether a lightning strike has occurred based on the valve voltage waveform. The MCU can flexibly adjust the threshold based on different lightning currents, valves with different varistor voltages, and different waveform durations.

[0030] Preferably, in this invention, the MCU is also connected to a data storage module for storing historical data of leakage current and number of actions, and a communication module for communicating with a host computer; this enables the monitor to store historical data and communicate with the host computer, thus combining local pointer display, counter action count accumulation, digital measurement, storage and uploading functions, making the monitor multifunctional.

[0031] The data storage module can save historical data such as leakage current and the number of lightning strikes when the power is off, thus preventing the loss of historical data due to power failure.

[0032] The communication module can receive query commands from the host computer and send data uploaded by the MCU, thereby enabling the telemetry and remote control functions of the monitor.

[0033] Preferably, in this invention, the pressure limiting protection valve plate is a zinc oxide valve plate. The zinc oxide valve plate has nonlinear varistor characteristics, which can limit the voltage on both sides when subjected to surge current, protect parallel equipment, and ensure the protection effect.

[0034] Preferably, in this invention, the switching circuit includes two sets of switching switches. The first set of switching switches is used to switch the mechanical meters and counters to the driver output terminal, and the second set of switching switches is used to switch the mechanical meters and counters to the rectifier bridge output terminal. The setting of the two sets of switching switches ensures a stable switching effect.

[0035] This invention also provides a method for operating a digital surge arrester monitor. Based on the aforementioned digital surge arrester monitor, this method allows the MCU to operate normally and drive mechanical meters and counters when the power supply is on. When the power supply fails, through the design of the switching circuit, the mechanical meters and counters can still be directly driven by leakage current and lightning strike energy, ensuring that the monitor can continue to work under extreme conditions, thus improving the stability and reliability of the system. This method effectively improves the accuracy and reliability of surge arrester monitoring, which is of great significance for ensuring the safe operation of power equipment and power systems. Attached Figure Description

[0036] Figure 1This is a circuit diagram of a digital surge arrester monitor provided in an embodiment of the present invention.

[0037] Figure label:

[0038] 1-Zinc oxide valve plate, 2-Voltage divider, 3-Power frequency current isolation circuit, 4-Rectifier bridge, 5-Switching circuit, 6-Mechanical meter and counter, 7-Steady-state acquisition circuit, 8-Transient acquisition circuit, 9-MCU, 10-Data storage module, 11-Driver, 12-Communication module, 13-Surge arrester. Detailed Implementation

[0039] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0045] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0046] Example 1

[0047] As mentioned in the background section, due to the presence of the series gap, the surge arrester lacks a reliable and stable external or internal energy supply, resulting in surge arrester monitoring methods being limited to mechanical meters. In addition, inspection personnel can only visit the site periodically to record data, making it impossible to detect surge arrester operation in a timely manner. Furthermore, the connection point between the gap and the surge arrester in the series gap surge arrester is at a high potential during operation, making it difficult to effectively collect data such as the impulse current at that point. The high-potential operation process of the series gap surge arrester still cannot be captured. Therefore, existing monitoring methods cannot effectively extract power from the high potential of the series gap zinc oxide surge arrester during operation to achieve timely monitoring of the impulse current.

[0048] To address the aforementioned problems, this invention provides a digital surge arrester monitor and its operating method. Specifically, it provides a digital surge arrester monitor with mechanical pointer display and waveform measurement functions. This monitor and method can solve the problems of high-potential power extraction and impulse current monitoring when a series gap zinc oxide surge arrester operates.

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0050] like Figure 1 As shown, this embodiment provides a digital surge arrester monitor, the specific structure of which includes:

[0051] The monitor, consisting of the following components—zinc oxide valve plate 1, voltage divider 2, power frequency current isolation circuit 3, rectifier bridge 4, switching circuit 5, mechanical meter and counter 6, steady-state acquisition circuit 7, transient acquisition circuit 8, MCU 9, data storage module 10, driver 11, and communication module 12—monitors the surge arrester 13 in real time.

[0052] This embodiment specifically includes:

[0053] Zinc oxide valve plate 1 is installed at the lower end of the surge arrester and connected to ground. A voltage divider is connected to both ends of zinc oxide valve plate 1. A rectifier bridge 4, a switching circuit 5, and a mechanical meter and counter 6 are connected in parallel to both ends of the voltage divider. A power frequency current isolation circuit 3 is connected between the voltage divider 2 and the rectifier bridge 4. The voltage divider 2 is connected to the MCU9 through a transient acquisition circuit 8. The power frequency current isolation circuit 3 is connected to the MCU9 through a steady-state acquisition circuit 7. The MCU9 is connected to the data storage module 10, the driver 11, and the communication module 12 to achieve interaction. The MCU9 controls the switching circuit 5 and the mechanical meter and counter 6 through the driver 11. More specifically:

[0054] Zinc oxide varistor 1 is used for voltage limiting protection of the device when the surge arrester operates; zinc oxide varistor 1 has non-linear varistor characteristics, which can limit the voltage on both sides when subjected to surge current, and protect parallel equipment.

[0055] Voltage divider 2 is used to collect the valve plate voltage waveform when the surge arrester operates; voltage divider 2 is a voltage divider composed of high voltage arm and low voltage arm resistors, which can proportionally convert the high voltage arm potential to the low voltage arm.

[0056] The power frequency current isolation circuit 3 uses a power frequency isolation transformer to isolate and collect leakage current waveforms, and can convert the surge arrester leakage current to the output terminal according to the surge arrester.

[0057] Rectifier bridge 4 is used to convert alternating current into direct current for subsequent measurement and drive devices.

[0058] Switching circuit 5 is used for two sets of changeover switches. When the device is energized, it switches the mechanical meters and counters to the driver output terminal. When the device is de-energized, it switches the mechanical meters and counters to the rectifier bridge output terminal. When the monitor is de-energized, it retains the leakage current measurement and lightning strike counting functions of the mechanical pointer-type surge arrester monitor.

[0059] Mechanical meters and counters 6 are used for local display of the leakage current and number of operations of the surge arrester; specifically, they adopt a pointer-type ammeter and an electromagnetic counter. The pointer-type ammeter can indicate the leakage current of the surge arrester according to the pointer and scale, and the electromagnetic counter can switch when the surge arrester operates, so that the reading increases by one.

[0060] Steady-state acquisition circuit 7 is used to convert the analog value of leakage current into a digital value; steady-state acquisition circuit 7 is an operational amplifier and follower, which converts and amplifies the output signal of the power frequency current isolation circuit.

[0061] The transient acquisition circuit 8 is used to convert the analog value of the valve plate voltage waveform into a digital value; the transient acquisition circuit 8 is a high-speed operational amplifier and follower, which converts and amplifies the output signal of the voltage divider.

[0062] The MCU9 is used to calculate and acquire data, control the switching of circuits, and issue instructions for data storage and uploading. The MCU9 is a microcontroller that performs data processing, calculation, storage, and communication processes.

[0063] Data storage module 10 is used to store historical data on leakage current and number of operations.

[0064] Driver 11 is used to control the switching circuit 5 and the display data of mechanical meters and counter 6 according to the instructions of MCU9; it is a digital-to-analog converter and a controllable power supply. The digital-to-analog converter can drive the mechanical meter readings according to the instructions of MCU, and the controllable power supply can drive the counter to operate according to the instructions of MCU.

[0065] The communication module 12 is used for communication between MCU9 and the host computer. It can enable MCU9 to communicate with the host computer via wired or wireless means, receive commands from the host computer, and upload terminal data.

[0066] This embodiment provides a digital surge arrester monitor, the specific working principle of which is as follows:

[0067] In this embodiment, when the monitor loses power, the switching circuit 5 switches the mechanical meter and counter in the mechanical meter and counter 6 to the output of the rectifier bridge, so that the leakage current directly drives the mechanical meter and the lightning strike energy directly drives the counter, so that the device still has the function of displaying leakage current readings and accumulating the number of lightning strikes on the spot.

[0068] Specifically, when the monitor is powered on, the switching circuit 5 switches the mechanical meter and counter to the driver output. The leakage current passes through the power frequency current isolation circuit 3 to the steady-state acquisition circuit 7. After the MCU9 acquires the sampling signal, it uses the driver 11 to make the mechanical meter indicate according to the measured current value. The voltage divider 2 acquires the voltage waveform on the zinc oxide valve plate 1, which is transmitted to the MCU9 after passing through the transient acquisition circuit 8 and is calculated and judged. When the absolute value of the voltage exceeds the threshold, it is judged that a lightning strike has occurred, causing the driver 11 to drive the counter to operate once.

[0069] Specifically, MCU9 periodically collects power frequency current and stores historical data in data storage module 10. After detecting a lightning strike, it records the voltage waveform of zinc oxide valve plate 1 and stores it in data storage module 10. The host computer sends a query command to MCU9 through communication module 12, and MCU9 returns the query value according to the command. When the leakage current value exceeds the threshold or a lightning strike occurs, MCU9 actively sends an alarm message.

[0070] Therefore, this digital surge arrester monitor consists of a zinc oxide valve plate, a voltage divider, a power frequency current isolation circuit, a rectifier bridge, a switching circuit, mechanical meters and counters, a steady-state acquisition circuit, a transient acquisition circuit, an MCU, a data storage module, a driver, and a communication module. When the device loses power, the switching circuit switches the mechanical meters and counters to the rectifier bridge, enabling the device to have the pointer display of leakage current and the counter to record lightning strike actions, functions of a mechanical surge arrester monitor. When the device is energized, it collects leakage current through the power frequency current isolation current and the steady-state acquisition current, and collects the valve plate voltage waveform through the voltage divider and the transient acquisition circuit. After the MCU measures and calculates, it drives the mechanical meters according to the leakage current value, judges the lightning strike according to the voltage threshold, stores historical data, and communicates with the host computer, thus combining local pointer display, counter action counting accumulation, digital measurement, storage, and uploading functions.

[0071] In this embodiment, the MCU collects the valve plate voltage through a voltage divider and a transient acquisition circuit, and determines whether a lightning strike has occurred based on the valve plate voltage waveform. The MCU can flexibly adjust the threshold based on different lightning currents, valve plates with different varistor voltages, and different waveform durations.

[0072] In this embodiment, the data storage module can save historical data such as leakage current and the number of lightning strikes after power failure, thus preventing the loss of historical data due to power failure of the device.

[0073] In this embodiment, the communication module can receive query commands from the host computer and send data uploaded by the MCU, thereby realizing the telemetry and remote control functions of the monitor.

[0074] Example 2

[0075] This embodiment provides a method for operating a digital surge arrester monitor, based on the digital surge arrester monitor in Embodiment 1, specifically including:

[0076] When the digital surge arrester monitor is powered on, the switching circuit 5 switches the mechanical meter and counter 6 to the output of the driver 11. The leakage current passes through the power frequency current isolation circuit 3 to the MCU9, and then through the driver 11, the mechanical meter and counter 6 indicates according to the measured current value. The voltage divider 2 transmits the voltage waveform of the voltage limiting protection valve to the MCU9 for calculation and judgment. When the absolute value of the voltage exceeds the threshold, it is determined that a lightning strike has occurred, and the driver 11 drives the counter of the mechanical meter and counter 6 to operate once.

[0077] When the digital surge arrester monitor loses power, the switching circuit 5 switches the mechanical meters and counters 6 to the output of the rectifier bridge 4, so that the mechanical meters and counters 6 are directly driven by the leakage current and the energy of the lightning strike.

[0078] This method is also applicable to high-potential operation monitoring of series-gap zinc oxide surge arresters. In such cases, current monitoring measures typically rely on a reliable and stable external or internal power supply, which is highly limiting. Furthermore, inspection personnel can only visit the site periodically to record data, making it impossible to detect surge arrester operation in a timely manner. With this method, the MCU can operate normally and drive mechanical meters and counters when the power supply is on. When the power supply fails, the mechanical meters and counters can still be directly driven by leakage current and lightning strike energy through the switching circuit design, ensuring that the monitor can continue to work even in extreme situations, thus improving the stability and reliability of the system. This method effectively improves the accuracy and reliability of surge arrester monitoring, which is of great significance for ensuring the safe operation of power equipment and power systems.

[0079] Example 3

[0080] This embodiment provides another digital surge arrester monitor, which is optimized and improved based on Embodiment 1, specifically including:

[0081] Installed directly at the lower end of the 110kV surge arrester to the ground, it is used for online monitoring and local indication of leakage current and lightning strike action of the 110kV zinc oxide surge arrester.

[0082] The varistor voltage of zinc oxide valve plate 1 is 300V.

[0083] The voltage divider 2 has a voltage ratio of 1000:1.

[0084] The conversion ratio of the power frequency current isolation circuit 3 is 1:1.

[0085] The withstand voltage of rectifier bridge 4 is 1000V.

[0086] The operating voltage of switching circuit 5 is 24V, and the isolation voltage is 5000V.

[0087] The mechanical meter and counter 6 has a metering range of 3mA and a counter indication range of 0 to 999.

[0088] The amplification ratio of the steady-state acquisition circuit 7 is 2.

[0089] The amplification ratio of transient acquisition circuit 8 is 2 times.

[0090] MCU9 is an STM32 microcontroller.

[0091] Driver 10 is a 24V controllable power supply and DAC.

[0092] Communication module 12 is an RS485 communication module.

[0093] Therefore, this embodiment provides a 110kV zinc oxide surge arrester local pointer-type digital remote transmission monitoring device, which can be used for digital remote transmission and local indication of 110kV zinc oxide surge arresters. Using this device, digital remote transmission and local indication can be achieved under normal power supply, and local indication function is available even when the device loses power. This solves the reliability problem of digital online monitoring devices for zinc oxide surge arresters.

[0094] In summary, this invention provides a digital surge arrester monitor and its operating method, which has the following advantages compared to existing monitoring measures:

[0095] This invention provides a digital surge arrester monitor with mechanical pointer display and waveform measurement functions. It combines the features of mechanical meters and digital remote meters. When the device is powered normally, it can realize the digital acquisition, data storage, and uploading of surge arrester leakage current and lightning strike action, as well as the local indication of the pointer and counter. When the device loses power, it still has the mechanical meter indication and counter indication functions of a mechanical surge arrester monitor, meeting the dual needs of on-site observation and digital remote monitoring of surge arresters, and ensuring that the device has the function of a surge arrester monitor under various operating conditions.

[0096] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A digitized surge arrester monitor, characterized by, The pressure limiting protection valve plate is installed at the lower end of the lightning arrester and connected with the ground. Two ends of the pressure limiting protection valve plate are connected with a voltage divider (2). Two ends of the voltage divider (2) are connected with a rectifier bridge (4), a switching circuit (5) and a mechanical meter and counter (6) in sequence. A power frequency current isolation circuit (3) is connected between the voltage divider (2) and the rectifier bridge (4). Output ends of the voltage divider (2) and the power frequency current isolation circuit (3) are respectively connected with an MCU (9). The MCU (9) controls the switching circuit (5) and the mechanical meter and counter (6) through a driver (11). When the power supply of the digital lightning arrester monitor is powered, the switching circuit (5) can switch the mechanical meter and counter (6) to the output end of the driver (11), the leakage current passes through the power frequency current isolation circuit (3) to the MCU (9), and then passes through the driver (11) to make the mechanical meter of the mechanical meter and counter (6) indicate according to the measured current value; the voltage waveform of the pressure limiting protection valve plate collected by the voltage divider (2) is transmitted to the MCU (9) and calculated, and when the absolute value of the voltage exceeds a threshold value, it is judged that a lightning stroke occurs, and the counter of the mechanical meter and counter (6) is driven once by the driver (11). When the power supply of the digital lightning arrester monitor is powered off, the switching circuit (5) can switch the mechanical meter and counter (6) to the output end of the rectifier bridge (4) to make the mechanical meter and counter (6) directly driven by the leakage current and the lightning stroke energy. The power frequency current isolation circuit (3) is connected with the MCU (9) through a steady-state acquisition circuit (7).

2. A digitalizer surge arrester monitor according to claim 1, characterized in that, The voltage divider (2) is connected with the MCU (9) through a transient-state acquisition circuit (8).

3. A digitalizer surge arrester monitor according to claim 1, characterized in that, The MCU (9) is further connected with a data storage module (10) for storing historical data of the leakage current and the number of actions and a communication module (12) for realizing communication with an upper computer.

4. The digital surge arrester monitor of claim 1, wherein, The pressure limiting protection valve plate adopts a zinc oxide valve plate (1).

5. The digitalizer surge arrester monitor according to claim 1, wherein The voltage divider (2) includes a high-voltage arm resistor and a low-voltage arm resistor, and the potential of the high-voltage arm resistor can be converted to the low-voltage arm resistor in proportion.

6. The digitalizer surge arrester monitor according to claim 1, wherein The power frequency current isolation circuit (3) adopts a power frequency isolation transformer for isolating and collecting the leakage current waveform.

7. The digitalizer surge arrester monitor according to claim 1, wherein The switching circuit (5) includes two groups of conversion switches, the first group of conversion switches are used for switching the mechanical meter and counter (6) to the output end of the driver (11), and the second group of conversion switches are used for switching the mechanical meter and counter (6) to the output end of the rectifier bridge (4).

8. The digitalizer surge arrester monitor according to claim 1, wherein, The mechanical meter and counter (6) includes a mechanical meter and a counter; the mechanical meter adopts a pointer type ammeter for indicating the leakage current of the lightning arrester according to the pointer and the scale; and the counter adopts an electromagnetic counter for action counting.

9. The digitalizer surge arrester monitor according to claim 1, wherein, The digital lightning arrester monitor according to any one of claims 1-9, comprising:

10. A method of operating a digitizer arrester monitor, characterized by, ​ When the digital lightning arrester monitor is powered, the switching circuit (5) switches the mechanical meter and counter (6) to the output end of the driver (11), the leakage current passes through the power frequency current isolation circuit (3) to the MCU (9), and then passes through the driver (11) to make the mechanical meter of the mechanical meter and counter (6) indicate the measured current value; the voltage divider (2) transmits the voltage waveform of the voltage limiting protection valve sheet collected to the MCU (9) and performs calculation and judgment, when the absolute value of the voltage exceeds the threshold value, it is judged that a lightning stroke occurs, and the driver (11) drives the counter of the mechanical meter and counter (6) to act once; When the digital lightning arrester monitor loses power, the switching circuit (5) switches the mechanical meter and counter (6) to the output end of the rectifier bridge (4), so that the mechanical meter and counter (6) are directly driven by the leakage current and the lightning stroke energy.

Images