A lightning arrester monitor

Abstract

The utility model discloses a lightning arrester monitor, including intelligent monitor main part and three -phase sampling circuit, three -phase sampling circuit and intelligent monitor main part form two -way electric connection, and one end of three -phase sampling circuit corresponds electric connection to the low voltage terminal of corresponding phase lightning arrester, and the other end electric connection is to the ground end, and intelligent monitor main part fixed mounting is in control room to realize the centralized monitoring of three -phase lightning arrester, the utility model has the beneficial effects that: through two -way electric connection of three -phase sampling circuit and control room intelligent monitor main part, realize three -phase lightning arrester centralized monitoring, simplify system layout, reduce cost and promote control convenience, three -phase sampling circuit current passageway series connection zinc oxide valve piece, can limit voltage and overcurrent, protect internal device, prolong the life and guarantee sampling stability.

Description

Technical Field

[0001] This utility model relates to a surge arrester monitoring instrument. Background Technology

[0002] During the operation of a power system, surge arresters, as core components for suppressing lightning overvoltages and switching overvoltages and protecting critical power equipment such as transformers and switches, directly determine the stability and safety of the power system. With the development of power systems towards higher voltage, larger capacity, and greater intelligence, higher demands are placed on the monitoring accuracy, response speed, and ease of operation and maintenance of surge arresters.

[0003] However, traditional monitoring methods often require independent monitoring devices for a single surge arrester. For three-phase surge arresters, three separate sets of equipment need to be installed, which not only leads to a cumbersome monitoring system layout and high equipment costs, but also requires maintenance personnel to check the monitoring data of each phase on-site. This makes it impossible to achieve centralized control of the operating status of the three-phase surge arresters, reducing monitoring efficiency and maintenance convenience. In view of this, this utility model proposes a surge arrester monitoring instrument to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a surge arrester monitoring instrument to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A surge arrester monitoring instrument includes an intelligent monitoring instrument body and a three-phase sampling circuit. The three-phase sampling circuit forms a bidirectional electrical connection with the intelligent monitoring instrument body. One end of the three-phase sampling circuit is electrically connected to the low-voltage terminal of the corresponding phase surge arrester, and the other end is electrically connected to the grounding terminal. The intelligent monitoring instrument body is fixedly installed in the control room to realize centralized monitoring of the three-phase surge arresters. A zinc oxide valve is connected in series in the current path of the three-phase sampling circuit, and the zinc oxide valve is fixed inside the housing of the three-phase sampling circuit by a metal bracket. The circuit board inside the main body of the intelligent monitoring instrument integrates industrial-grade integrated circuits, high-precision AD acquisition chips, and signal amplification and filtering circuits. The three-phase signal input terminals of the high-precision AD acquisition chip are electrically connected to the signal output terminals of the three-phase sampling circuit, respectively, for synchronous acquisition of three-phase current data. The input terminal of the signal amplification and filtering circuit is electrically connected to the signal output terminal of the high-precision AD acquisition chip, and the output terminal is electrically connected to the signal input terminal of the industrial-grade integrated circuit, so as to amplify and perform anti-interference filtering on the acquired current signal. The main body of the intelligent monitoring instrument is equipped with an AC / DC universal power supply module, and the output terminal of the power supply module is connected to an industrial-grade integrated circuit and a high-precision AD acquisition chip, respectively. The main body of the intelligent monitoring instrument has an audible and visual alarm circuit soldered on its circuit board via pins. The audible and visual alarm circuit is connected to the power supply module and electrically connected to the alarm control output terminal of the industrial-grade integrated circuit.

[0006] As an improvement to the above technical solution, the circuit board of the main body of the intelligent monitoring instrument integrates a three-phase independent counter that is electrically connected to an industrial-grade integrated circuit. The three-phase independent counter realizes the independent counting of the number of times the three-phase surge arrester operates through a microelectronic counting circuit. The counting range of each counting module is 0-999 times, and the counting data is transmitted to the industrial-grade integrated circuit for storage in real time.

[0007] As an improvement to the above technical solution, the alarm threshold of the audible and visual alarm circuit is set through the parameter configuration port of the industrial-grade integrated circuit. The parameter configuration port is electrically connected to the operating circuit of the main body of the intelligent monitoring instrument, and the minimum setting value of the alarm threshold is 0.001mA.

[0008] As an improvement to the above technical solution, the front operation panel of the main body of the intelligent monitoring instrument is equipped with an operation button group, which includes a SET function key, a right shift key, an up selection key, a down adjustment key, and a return key. The signal output terminal of the SET function key is electrically connected to the confirmation control port of the industrial-grade integrated circuit, which is used to enter the parameter setting interface and confirm the setting parameters. The signal output terminal of the right shift key is electrically connected to the bit selection port of the industrial-grade integrated circuit, and is used to switch the setting bit to the right or switch the setting item to the up. The signal output terminals of the up selection key and the down adjustment key are electrically connected to the item selection port of the industrial-grade integrated circuit. The up selection key is used to select the setting item upwards, and the down adjustment key is used to select the setting item downwards or to make the setting value increase cyclically within the range of 0-9. The signal output terminal of the return button is electrically connected to the return control port of the industrial-grade integrated circuit, and is used to return to the previous setting menu.

[0009] As an improvement to the above technical solution, the main body of the intelligent monitoring instrument has a data storage chip fixed inside. The data interface of the data storage chip is bidirectionally electrically connected to the storage control port of the industrial-grade integrated circuit, which can store the historical monitoring data of the surge arrester. The historical data query command can be triggered by operating the button group, and the industrial-grade integrated circuit can call up the stored data and display it.

[0010] As an improvement to the above technical solution, the outer shell of the main body of the intelligent monitoring instrument is a cuboid structure with external dimensions of 120mm (length) × 120mm (width) × 88mm (width), and the back of the outer shell is provided with fixing screw holes that are compatible with the mounting bracket.

[0011] As an improvement to the above technical solution, the outer shell of the main body of the intelligent monitoring instrument is made of ABS flame-retardant material, and a moisture-proof sealing gasket is provided between the outer shell and the circuit board. The main body of the intelligent monitoring instrument is adapted to a working environment with a temperature of -10 to 50℃ and a relative humidity of 20 to 90%.

[0012] As an improvement to the above technical solution, an LCD screen is embedded on the front operation panel of the main body of the intelligent monitoring instrument. The display driver of the LCD screen is electrically connected to the display control port of the industrial-grade integrated circuit, and is used to display the real-time operating current, cumulative number of operations, historical monitoring data, parameter setting interface and operation guide of the three-phase surge arrester in real time. The backlight brightness of the Chinese menu display module can be adjusted by the operation button group.

[0013] Compared with the prior art, the beneficial effects of this utility model are: The three-phase sampling circuit is bidirectionally connected to the main body of the intelligent monitoring instrument in the control room, enabling centralized monitoring of three-phase surge arresters, simplifying system layout, reducing costs, and improving management convenience. The three-phase sampling circuit's current path is connected in series with zinc oxide valves, which limit voltage and overcurrent, protect internal components, extend service life, and ensure stable sampling. The high-precision AD acquisition chip in the main body of the intelligent monitoring instrument can synchronously and accurately acquire three-phase current data, providing reliable raw data for status determination. The signal amplification and filtering circuit can amplify weak current signals and filter out noise, improving signal processing accuracy and anti-interference capabilities. The AC / DC universal power supply module adapts to different power supply environments, expanding applicable scenarios and improving installation and usage flexibility. The audible and visual alarm circuit provides real-time warnings when the current or number of actions exceeds preset values, helping maintenance personnel to handle anomalies promptly and ensuring power system safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the frame structure of this utility model.

[0015] In the diagram: 10. Main body of the intelligent monitoring instrument; 11. High-precision AD acquisition chip; 12. Signal amplification and filtering circuit; 13. Industrial-grade integrated circuit; 14. Data storage chip; 20. Three-phase sampling circuit; 21. Zinc oxide valve plate; 30. Power supply module; 40. Audible and visual alarm circuit; 50. LCD screen; 60. Three-phase independent counter; 70. Operation button group. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example: like Figure 1 As shown, this embodiment proposes a surge arrester monitoring instrument, including an intelligent monitoring instrument body 10 and a three-phase sampling circuit 20. The three-phase sampling circuit 20 forms a bidirectional electrical connection with the intelligent monitoring instrument body 10. One end of the three-phase sampling circuit 20 is electrically connected to the low-voltage terminal of the corresponding phase surge arrester, and the other end is electrically connected to the grounding terminal. The intelligent monitoring instrument body 10 is fixedly installed in the control room to realize centralized monitoring of the three-phase surge arrester. A zinc oxide valve plate 21 is connected in series in the current path of the three-phase sampling circuit 20. The zinc oxide valve plate 21 is fixed inside the housing of the three-phase sampling circuit 20 by a metal bracket. The circuit board inside the main body 10 of the intelligent monitoring instrument integrates an industrial-grade integrated circuit 13, a high-precision AD acquisition chip 11, and a signal amplification and filtering circuit 12. The three-phase signal input terminals of the high-precision AD acquisition chip 11 are electrically connected to the signal output terminals of the three-phase sampling circuit 20, respectively, for synchronous acquisition of three-phase current data. The input terminal of the signal amplification and filtering circuit 12 is electrically connected to the signal output terminal of the high-precision AD acquisition chip 11, and the output terminal is electrically connected to the signal input terminal of the industrial-grade integrated circuit 13, so as to amplify and perform anti-interference filtering on the acquired current signal. The main body 10 of the intelligent monitoring instrument is equipped with an AC / DC universal power module 30, and the output terminal of the power module 30 is connected to the industrial-grade integrated circuit 13 and the high-precision AD acquisition chip 11 respectively. The main body 10 of the intelligent monitoring instrument has an audible and visual alarm circuit 40 soldered on its circuit board via pins. The audible and visual alarm circuit 40 is connected to the power module 30 and electrically connected to the alarm control output terminal of the industrial-grade integrated circuit 13. When the industrial-grade integrated circuit 13 determines that the monitored current data or the number of surge arrester actions exceeds the preset alarm value, it triggers the audible and visual alarm circuit 40 to issue an audible and visual warning signal.

[0018] In this case, the three-phase sampling circuit 20 can be divided into three simultaneous inputs: A, B, and C. The three-phase sampling circuit 20 is a three-phase independent current sampling execution module: each phase unit collects the operating current of one phase surge arrester. Through internal current sensing elements, such as miniature current transformers and shunts, but it must meet the high-precision sampling requirements to match the high-precision AD acquisition chip 11 of the main body of the monitor, the operating current of the surge arrester is converted into a transmittable electrical signal, and then synchronously transmitted to the main body of the intelligent monitor 10 through the signal output interface, providing raw data for subsequent signal amplification, filtering and status determination; at the same time, with the help of the built-in zinc oxide valve 21, it plays a protective role when the surge arrester has abnormal overcurrent, ensuring the stability of the sampling process and the service life of the unit itself.

[0019] In this embodiment, when monitoring the surge arrester, one end of the three-phase sampling circuit 20 is electrically connected to the low-voltage terminal of the three-phase surge arrester to be monitored, and the other end is electrically connected to the ground terminal. At the same time, it is ensured that the zinc oxide valve plate 21 connected in series inside the three-phase sampling circuit 20 is firmly fixed inside the housing by the metal bracket to avoid loose installation affecting the overcurrent protection effect. Then, the main body 10 of the intelligent monitoring instrument is fixed in the control room. Subsequently, the signal output terminal of the three-phase sampling circuit 20 is connected to the three-phase signal input terminal of the high-precision AD acquisition chip 11 inside the main body 10 of the intelligent monitoring instrument to complete the bidirectional electrical connection. At the same time, through the AC / DC universal power module 30 interface of the main body 10 of the intelligent monitoring instrument, a suitable AC or DC power supply is connected to ensure that the output terminal of the power module 30 can stably supply power to the core components such as the industrial-grade integrated circuit 13 and the high-precision AD acquisition chip 11, so as to facilitate the monitoring process. The three-phase sampling circuit 20 is bidirectionally electrically connected to the main body 10 of the intelligent monitoring instrument in the control room, enabling centralized monitoring of three-phase surge arresters, simplifying system layout, reducing costs, and improving management convenience. The current path of the three-phase sampling circuit 20 is connected in series with the zinc oxide valve plate 21, which can limit voltage and overcurrent, protect internal components, extend service life, and ensure stable sampling. The high-precision AD acquisition chip 11 of the main body 10 of the intelligent monitoring instrument can synchronously and accurately acquire three-phase current data, providing reliable raw data for status determination. The signal amplification and filtering circuit 12 can amplify weak current signals and filter out noise, improving signal processing accuracy and anti-interference capability. The AC / DC universal power supply module 30 is adapted to different power supply environments, expanding the applicable scenarios and improving installation and usage flexibility. The audible and visual alarm circuit 40 provides real-time warnings when the current or number of actions exceeds the preset value, helping maintenance personnel to handle anomalies in a timely manner and ensuring the safety of the power system.

[0020] Specifically, the circuit board of the main body 10 of the intelligent monitoring instrument integrates a three-phase independent counter 60 that is electrically connected to the industrial-grade integrated circuit 13. The three-phase independent counter 60 realizes independent counting of the number of times the three-phase surge arrester operates through a microelectronic counting circuit. The counting range of each counting module is 0-999 times, and the counting data is transmitted to the industrial-grade integrated circuit 13 for storage in real time.

[0021] In this embodiment, a three-phase independent counter 60 electrically connected to an industrial-grade integrated circuit 13 is integrated on the circuit board of the main body 10 of the intelligent monitoring instrument. The three-phase independent counter 60 counts the number of times the three-phase surge arresters operate by means of a microelectronic counting circuit, avoiding mutual interference between the three-phase counts, ensuring the independence and accuracy of the counting of the number of times each phase surge arrester operates, and providing accurate data support for the subsequent separate analysis of the operating status of each phase surge arrester.

[0022] Specifically, the alarm threshold of the audible and visual alarm circuit 40 is set through the parameter configuration port of the industrial-grade integrated circuit 13. The parameter configuration port is electrically connected to the operation circuit of the intelligent monitoring instrument body 10, and the minimum setting value of the alarm threshold is 0.001mA.

[0023] In this embodiment, by associating the alarm threshold of the audible and visual alarm circuit 40 with the parameter configuration port of the industrial-grade integrated circuit 13, and electrically connecting the configuration port with the operating circuit of the main body 10 of the intelligent monitoring instrument, maintenance personnel can conveniently adjust the alarm threshold through the operating circuit based on the actual power system operating conditions, surge arrester model and monitoring requirements, breaking the limitation of fixed thresholds on different application scenarios and improving the adaptability of the monitoring instrument to diverse usage environments.

[0024] Specifically, the operation panel on the front of the main body 10 of the intelligent monitoring instrument is equipped with an operation button group 70, which includes a SET function key, a right shift key, an up selection key, a down adjustment key, and a return key. The signal output terminal of the SET function key is electrically connected to the confirmation control port of the industrial-grade integrated circuit 13, which is used to enter the parameter setting interface and confirm the setting parameters. The signal output terminal of the right shift key is electrically connected to the bit selection port of the industrial-grade integrated circuit 13, and is used to switch the setting bit to the right or switch the setting item to the up. The signal output terminals of the up selection key and the down adjustment key are electrically connected to the item selection port of the industrial-grade integrated circuit 13, respectively. The up selection key is used to select the setting item upwards, and the down adjustment key is used to select the setting item downwards or to make the setting value increase cyclically within the range of 0-9. The signal output terminal of the return key is electrically connected to the return control port of the industrial-grade integrated circuit 13, and is used to return to the previous setting menu.

[0025] In this embodiment, an operation button group 70 containing a SET function key, a right shift key, an up selection key, a down adjustment key, and a return key is embedded in the operation panel on the front of the main body 10 of the intelligent monitoring instrument. The signal output terminals of each button are electrically connected to the corresponding control ports (confirmation control port, bit selection port, item selection port, and return control port) of the industrial-grade integrated circuit 13. This allows maintenance personnel to perform operations such as entering the parameter setting interface, switching between setting bits / setting items, adjusting values, and returning to the menu through dedicated buttons, avoiding confusion of operation functions and improving the accuracy of parameter setting and operation efficiency.

[0026] Specifically, the main body 10 of the intelligent monitoring instrument has a data storage chip 14 fixed inside. The data interface of the data storage chip 14 is bidirectionally electrically connected to the storage control port of the industrial-grade integrated circuit 13. It can store the historical monitoring data of the surge arrester, and the historical data query command can be triggered by operating the button group 70, so that the industrial-grade integrated circuit 13 can call up the stored data and display it.

[0027] In this embodiment, the data storage chip 14 is an EEPROM chip, and the historical monitoring data includes the action current value, action time and number of actions; By fixing a data storage chip 14 inside the main body 10 of the intelligent monitoring instrument, and by making the data interface of this module bidirectionally electrically connected to the storage control port of the industrial-grade integrated circuit 13, the historical monitoring data of the three surge arresters can be stably stored. The non-volatile characteristics ensure that the data is not lost when the equipment is powered off, avoiding damage or loss of historical monitoring data due to power interruption, ensuring the security and integrity of data storage, and providing a foundation for subsequent data traceability.

[0028] Specifically, the outer shell of the main body 10 of the intelligent monitoring instrument is a cuboid structure with external dimensions of 120mm (length) × 120mm (width) × 88mm (width), and the back of the outer shell is provided with fixing screw holes that are compatible with the mounting bracket.

[0029] Specifically, the outer shell of the main body 10 of the intelligent monitoring instrument is made of ABS flame-retardant material, and a moisture-proof sealing gasket is provided between the outer shell and the circuit board; The working environment of the main body 10 of the intelligent monitoring instrument is adapted to a temperature of -10 to 50℃ and a relative humidity of 20 to 90%.

[0030] In this embodiment, the outer shell is made of ABS flame-retardant material. Utilizing the excellent flame-retardant properties of ABS, the shell can effectively delay or prevent combustion in scenarios with potential high temperatures and electrical sparks in the power control room, reducing the risk of fire and ensuring the operational safety of the equipment itself and surrounding power facilities. At the same time, the moisture-proof sealing gasket between the outer shell and the circuit board can prevent external moisture from entering the circuit board, avoiding problems such as short circuits and component corrosion caused by moisture. This further enhances the equipment's resistance to humid environments and covers the conventional environmental conditions of most power control rooms.

[0031] Specifically, the main body 10 of the intelligent monitoring instrument is equipped with an LCD screen 50 on the front operation panel. The display driver of the LCD screen 50 is electrically connected to the display control port of the industrial-grade integrated circuit 13. It is used to display the real-time operating current, cumulative number of operations, historical monitoring data, parameter setting interface and operation guide of the three-phase surge arrester in real time. The backlight brightness of the Chinese menu display module can be adjusted by the operation button group 70.

[0032] In this embodiment, by embedding an LCD screen 50 on the front operation panel of the main body 10 of the intelligent monitoring instrument, and electrically connecting the display driver terminal of the LCD screen 50 to the display control port of the industrial-grade integrated circuit 13, the real-time operating current, cumulative number of operations, historical monitoring data, parameter setting interface and operation guidance of the three-phase surge arrester can be displayed in real time. At the same time, it covers the full-dimensional information needs of "real-time status - historical data - parameter configuration - operation guidance" during the monitoring process, enabling maintenance personnel to intuitively and comprehensively grasp the operating status of the surge arrester and the equipment operation logic, and improve the efficiency of information acquisition.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surge arrester monitoring instrument, characterized in that: The system includes a main body (10) of an intelligent monitoring instrument and a three-phase sampling circuit (20). The three-phase sampling circuit (20) forms a bidirectional electrical connection with the main body (10) of the intelligent monitoring instrument. One end of the three-phase sampling circuit (20) is electrically connected to the low-voltage terminal of the corresponding phase surge arrester, and the other end is electrically connected to the grounding terminal. The main body (10) of the intelligent monitoring instrument is fixedly installed in the control room to realize centralized monitoring of the three-phase surge arrester. A zinc oxide valve plate (21) is connected in series in the current path of the three-phase sampling circuit (20), and the zinc oxide valve plate (21) is fixed inside the housing of the three-phase sampling circuit (20) by a metal bracket. The circuit board inside the main body (10) of the intelligent monitoring instrument integrates an industrial-grade integrated circuit (13), a high-precision AD acquisition chip (11), and a signal amplification and filtering circuit (12). The three-phase signal input terminals of the high-precision AD acquisition chip (11) are electrically connected to the signal output terminals of the three-phase sampling circuit (20) respectively, for synchronous acquisition of three-phase current data. The input terminal of the signal amplification and filtering circuit (12) is electrically connected to the signal output terminal of the high-precision AD acquisition chip (11), and the output terminal is electrically connected to the signal input terminal of the industrial-grade integrated circuit (13) to amplify and perform anti-interference filtering on the acquired current signal. The main body (10) of the intelligent monitoring instrument is equipped with an AC / DC universal power supply module (30), and the output end of the power supply module (30) is connected to an industrial-grade integrated circuit (13) and a high-precision AD acquisition chip (11) respectively. The main body (10) of the intelligent monitoring instrument has an audible and visual alarm circuit (40) soldered on its circuit board via pins. The audible and visual alarm circuit (40) is connected to the power supply module (30) and is electrically connected to the alarm control output terminal of the industrial-grade integrated circuit (13).

2. The surge arrester monitoring instrument according to claim 1, characterized in that: The main body (10) of the intelligent monitoring instrument has a three-phase independent counter (60) that is electrically connected to the industrial-grade integrated circuit (13) on its circuit board. The three-phase independent counter (60) realizes the independent counting of the number of times the three-phase surge arrester operates through a microelectronic counting circuit. The counting range of each counting module is 0-999 times, and the counting data is transmitted to the industrial-grade integrated circuit (13) for storage in real time.

3. The surge arrester monitoring instrument according to claim 1, characterized in that: The alarm threshold of the sound and light alarm circuit (40) is set through the parameter configuration port of the industrial-grade integrated circuit (13). The parameter configuration port is electrically connected to the operation circuit of the main body (10) of the intelligent monitoring instrument, and the minimum setting value of the alarm threshold is 0.001mA.

4. The surge arrester monitoring instrument according to claim 1, characterized in that: The main body (10) of the intelligent monitoring instrument is equipped with an operation button group (70) on the front operation panel. The operation button group (70) includes a SET function key, a right shift key, an up selection key, a down adjustment key, and a return key. The signal output terminal of the SET function key is electrically connected to the confirmation control port of the industrial-grade integrated circuit (13) for entering the parameter setting interface and confirming the setting parameters. The signal output terminal of the right shift key is electrically connected to the bit selection port of the industrial-grade integrated circuit (13) for switching the setting bit to the right or switching the setting item to the up. The signal output terminals of the up selection key and the down adjustment key are electrically connected to the item selection port of the industrial-grade integrated circuit (13). The up selection key is used to select the setting item upwards, and the down adjustment key is used to select the setting item downwards or to make the setting value increase cyclically within the range of 0-9. The signal output terminal of the return key is electrically connected to the return control port of the industrial-grade integrated circuit (13) for returning to the previous setting menu.

5. A surge arrester monitoring instrument according to claim 4, characterized in that: The main body (10) of the intelligent monitoring instrument has a data storage chip (14) fixed inside. The data interface of the data storage chip (14) is bidirectionally electrically connected to the storage control port of the industrial-grade integrated circuit (13). It can store the historical monitoring data of the surge arrester. The historical data query command can be triggered by operating the button group (70), and the stored data can be called and displayed by the industrial-grade integrated circuit (13).

6. A surge arrester monitoring instrument according to claim 1, characterized in that: The outer shell of the main body (10) of the intelligent monitoring instrument is a cuboid structure with external dimensions of 120mm (length) × 120mm (width) × 88mm (height), and the back of the outer shell is provided with fixing screw holes that are compatible with the mounting bracket.

7. A surge arrester monitoring instrument according to claim 1, characterized in that: The outer shell of the main body (10) of the intelligent monitoring instrument is made of ABS flame-retardant material, and a moisture-proof sealing gasket is provided between the outer shell and the circuit board; The working environment of the main body (10) of the intelligent monitoring instrument is adapted to a temperature of -10 to 50℃ and a relative humidity of 20 to 90%.

8. A surge arrester monitoring instrument according to claim 4, characterized in that: The main body (10) of the intelligent monitoring instrument is equipped with an LCD screen (50) on the front operation panel. The display driver of the LCD screen (50) is electrically connected to the display control port of the industrial-grade integrated circuit (13) to display the real-time operating current, cumulative number of operations, historical monitoring data, parameter setting interface and operation guide of the three-phase surge arrester in real time. The backlight brightness of the Chinese menu display module can be adjusted by the operation button group (70).

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