SF6 micro-water on-line monitoring device

Abstract

The utility model discloses an SF6 micro-water on-line monitoring device, which relates to the technical field of on-line monitoring and comprises a first support, a casing capable of being sealed, a gas circulation unit and a control unit. The gas circulation unit comprises a connecting pipe, a gas storage tank, a heating device for heating the gas storage tank and a micro water collector; a valve is arranged on the connecting pipe, the other end of the connecting pipe is connected with a connector, a first port of the connector is communicated with the connecting pipe, a second port of the connector is used for being communicated with a sulfur hexafluoride gas storage chamber in the high-voltage electrical equipment, a third port of the connector is used as a gas supplementing port, and a fourth port of the connector is communicated with the micro-water collector; the control unit comprises a mounting frame, a control circuit board and a protective shell, and a heat insulation layer is further arranged on the side, close to the heating device, of the mounting frame. The heat insulation layer effectively prevents a large amount of heat generated by the heating device from being transmitted to the control circuit board, and the service life is prolonged. And the first movable door and the second movable door are convenient for maintenance personnel to quickly approach corresponding parts according to needs.

Description

Technical Field

[0001] This utility model relates to the field of online monitoring technology, and in particular to an online monitoring device for SF6 micro-water content. Background Technology

[0002] SF6 gas plays a crucial role in arc extinguishing and insulation in high-voltage electrical equipment. However, excessive moisture content or reduced density of SF6 gas within high-voltage electrical equipment poses a serious threat to its safe operation. On one hand, in the presence of some metal components, at temperatures above 200°C, SF6 gas undergoes a hydrolysis reaction with water, generating corrosive HF and SOF2. This not only corrodes insulating and metal parts but also releases a large amount of heat, causing an increase in gas chamber pressure. On the other hand, at lower temperatures, excessive moisture may condense into dew, significantly reducing the surface insulation strength of insulating components and even triggering flashover, causing serious damage. Furthermore, when the density of SF6 gas drops to a certain level, the insulation and arc extinguishing performance of the equipment will be lost. Therefore, power grid operation regulations explicitly mandate that the density and moisture content of SF6 gas must be tested regularly before equipment commissioning and during operation.

[0003] To ensure the reliable operation of SF6 electrical equipment and enhance the continuous power supply capacity of the power system, online condition monitoring, detection, and fault prediction of its performance have become important research directions in the application field of SF6 electrical equipment. Especially against the backdrop of the increasing demand for remote control and telemetry in unattended substations, online monitoring of the density and moisture content of SF6 gas in SF6 electrical equipment has extremely important practical significance.

[0004] Existing SF6 gas online monitoring devices for high-voltage electrical equipment circulate gas from the sulfur hexafluoride storage chamber inside the high-voltage electrical equipment to the gas storage tank within the gas circulation mechanism through a sealed gas circulation mechanism. However, the gas storage tank, heating device, and control circuit of the online monitoring device are all housed within a sealed enclosure. During operation, the heating device generates a large amount of heat, causing high temperatures inside the enclosure, which seriously affects the operational stability and service life of the control circuit. Furthermore, the large number of parts inside the enclosure makes subsequent maintenance inconvenient. Utility Model Content

[0005] The purpose of this invention is to provide an online monitoring device for SF6 micro-water content, in order to solve the problems existing in the prior art and improve the ease of use and service life of the online monitoring device for SF6 micro-water content.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] This utility model provides an online monitoring device for SF6 micro-water content, comprising:

[0008] First support;

[0009] A sealable housing, the bottom of which is detachably connected to the first bracket; the housing has a first movable door and a second movable door, which are distributed on both sides of the housing;

[0010] A gas circulation unit includes a connecting pipe, a gas storage tank, a heating device for heating the gas storage tank, and a micro-water collector for detecting the gas in the gas circulation unit. The gas storage tank has a circulation vent connected to one end of the connecting pipe. The connecting pipe has a valve, and the other end is connected to a connector. The connector has a first port connected to the connecting pipe, a second port connected to a sulfur hexafluoride gas storage chamber inside high-voltage electrical equipment, a third port serving as a gas replenishment port, and a fourth port connected to the micro-water collector. The gas storage tank has a first temperature sensor for detecting the temperature of the gas inside the tank. Both the gas storage tank and the heating device are housed within the casing.

[0011] The control unit includes a mounting bracket, a control circuit board, and a protective housing. The mounting bracket is disposed within the housing. The gas storage tank and the heating device are located on the same side of the mounting bracket. The control circuit board is mounted on the side of the mounting bracket away from the heating device. A heat insulation layer is also provided on the side of the mounting bracket closest to the heating device. The protective housing covers the control circuit board. The first temperature sensor and the heating device are electrically connected to the control circuit board. The micro-water collector is communicatively connected to the control circuit board.

[0012] A terminal control device, which is communicatively connected to the control circuit board.

[0013] Preferably, a power supply is also provided inside the housing, which is used to supply power to the heating device, the micro water collector, the first temperature sensor and the control circuit board.

[0014] Preferably, the valve is a self-sealing valve or an electrically controlled valve.

[0015] Preferably, the material of the insulation layer is insulation cotton.

[0016] Preferably, it also includes a fault indicator light that is connected to the control circuit board via a signal.

[0017] Preferably, the terminal control device is a computer, tablet computer, or mobile phone.

[0018] Preferably, a terminal block is also provided inside the housing, and the signal lines of the control circuit board, the first temperature sensor and the heating device are respectively connected to the terminal block.

[0019] Preferably, the control unit is closer to the first movable door than the gas tank, and the gas tank is closer to the second movable door than the control unit; the protective shell is closer to the first movable door than the mounting bracket.

[0020] Preferably, the side wall of the housing is provided with a plurality of wire-passing holes, which are used to pass through power lines or signal lines; each wire-passing hole is provided with a gland.

[0021] Preferably, the housing, the first movable door, the second movable door, the first bracket, and the mounting bracket are all made of stainless steel;

[0022] The connector also has a fifth port, which is connected to an SF6 gas decomposition product content detection sensor.

[0023] Preferably, it also includes a pressure sensor disposed on the gas storage tank; the pressure sensor is used to detect the pressure of the gas inside the gas storage tank; the pressure sensor is electrically connected to the control circuit board.

[0024] The present invention achieves the following technical advantages over the prior art:

[0025] This utility model discloses an SF6 micro-moisture online monitoring device. By placing the gas storage tank, heating device, and control circuit board on opposite sides of the mounting frame, and installing a heat-insulating layer of thermal insulation cotton on the side of the mounting frame closer to the heating device, this design effectively prevents the large amount of heat generated by the heating device from being transferred to the control circuit board. This avoids the adverse effects of high internal temperatures on the stability and lifespan of the control circuit. This allows the control circuit to operate in a relatively stable temperature environment, reducing the probability of malfunctions caused by high temperatures, ensuring long-term stable operation of the device, and extending its overall lifespan. The housing has a first and a second movable door, with the control unit closer to the first movable door than the gas storage tank, the gas storage tank closer to the second movable door than the control unit, and the protective shell closer to the first movable door than the mounting frame. This layout allows maintenance personnel to quickly access the corresponding components through different movable doors as needed during maintenance, without requiring extensive disassembly of other components, greatly improving the convenience and efficiency of maintenance. Simultaneously, the detachable connection between the housing and the first bracket facilitates the inspection and maintenance of the overall internal structure, reducing maintenance costs and difficulty.

[0026] Furthermore, in the gas circulation unit, the gas storage tank is equipped with a circulation vent and a first temperature sensor, which, together with a connector, enables gas circulation, replenishment, and detection functions. By detecting the gas temperature inside the storage tank using the first temperature sensor, and combining this with the detection of trace moisture content in the gas using a micro-moisture collector, the state parameters of the SF6 gas can be obtained in real time and comprehensively. This accurate detection data provides a reliable basis for judging the performance of SF6 gas within high-voltage electrical equipment, helping to promptly detect problems such as excessive trace moisture content, thereby ensuring the safe and stable operation of the equipment.

[0027] Furthermore, the terminal control equipment can be a computer, tablet, or mobile phone, which communicates with the control circuit board to achieve remote control and data viewing of the monitoring device. This flexible connection method allows staff to monitor the SF6 gas status inside high-voltage electrical equipment in real time without being physically present on-site. It is particularly suitable for scenarios such as unmanned substations, meeting the growing demand for remote control and telemetry, and improving the intelligent management level and continuous power supply capability of the power system.

[0028] Furthermore, the sidewalls of the housing are equipped with cable entry ports and glands, which not only facilitate the insertion and exit of power and signal cables but also effectively prevent dust and moisture from entering the housing, providing excellent protection for the internal circuits and components. Meanwhile, the stainless steel housing, sliding doors, brackets, and mounting racks possess excellent corrosion resistance and strength, enabling them to adapt to various complex working environments and further ensuring the safety and stability of the device's operation.

[0029] Furthermore, the device is equipped with fault indicator lights, which can intuitively display whether a fault has occurred during the operation of the device, making it easier for staff to detect and handle problems in a timely manner; the terminal block arrangement makes the signal line connections of the control circuit board, sensors and heating device more organized, which facilitates the inspection and maintenance of the lines, and also facilitates the subsequent functional expansion and upgrade of the device, enhancing the practicality and versatility of the device.

[0030] Furthermore, the terminal control device can be a functional unit used to automatically collect, receive and process equipment status monitoring data sent by sensors, and to perform equipment status quantity analysis and early warning. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1This is a schematic diagram of the gas circulation unit in the SF6 micro-water online monitoring device of this utility model;

[0033] Figure 2 This is a partial structural diagram of the SF6 micro-water online monitoring device of this utility model. Figure 1 ;

[0034] Figure 3 This is a partial structural diagram of the SF6 micro-water online monitoring device of this utility model. Figure 2 ;

[0035] Figure 4 This is a partial structural diagram of the SF6 micro-water online monitoring device of this utility model. Figure 3 ;

[0036] Figure 5 This is a schematic diagram of the monitoring system composed of the SF6 micro-water online monitoring device of this utility model;

[0037] Figure 6 This is a control principle diagram of the SF6 micro-water online monitoring device of this utility model;

[0038] In the diagram: 1. Housing; 2. Micro-water collector; 3. Power supply box; 4. Sulfur hexafluoride gas storage chamber; 5. Terminal control equipment; 6. Gas storage tank; 7. Valve; 8. Connecting pipe; 9. Connector; 10. Heating device; 11. First temperature sensor; 12. Pressure sensor; 13. Circulation vent; 14. Terminal block; 15. Gland; 16. First bracket; 17. Control unit; 18. Power supply; 19. First movable door; 20. Second movable door; 171. Control circuit board; 172. Insulation layer; 173. Protective shell; 174. Mounting bracket; 1711. Input power supply; 1712. Power module; 1713. Watchdog module; 1714. Data storage module; 1715. Fault indication module; 1716. Acquisition module; 1717. Communication module; 1718. Main control module; 1719. Heating control module. Detailed Implementation

[0039] 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.

[0040] The purpose of this invention is to provide an online monitoring device for SF6 micro-water content, in order to solve the problems existing in the prior art and improve the ease of use and service life of the online monitoring device for SF6 micro-water content.

[0041] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like Figures 1 to 6 As shown, this embodiment provides an online monitoring device for SF6 micro-water content, comprising:

[0043] First support 16;

[0044] The housing 1 is capable of being sealed, and the bottom end of the housing 1 is detachably connected to the first bracket 16 by bolts; the housing 1 has a first movable door 19 and a second movable door 20, which are distributed on both sides of the housing 1.

[0045] The gas circulation unit includes a connecting pipe 8, a gas storage tank 6, a heating device 10 for heating the gas storage tank 6, and a micro-water collector 2 for detecting the gas in the gas circulation unit. The gas storage tank 6 is equipped with a circulation vent 13 connected to one end of the connecting pipe 8. A valve 7 is installed on the connecting pipe 8, and the other end of the connecting pipe 8 is connected to a connector 9. The first port of the connector 9 is connected to the connecting pipe 8, the second port is connected to the sulfur hexafluoride gas storage chamber 4 inside the high-voltage electrical equipment, the third port serves as a gas replenishment port, and the fourth port is connected to the micro-water collector 2. The gas replenishment port can replenish sulfur hexafluoride gas lost due to detection or equipment leakage. A first temperature sensor 11 is installed on the gas storage tank 6 to detect the temperature of the gas inside the gas storage tank 6. Both the gas storage tank 6 and the heating device 10 are housed within a housing 1. Part of the connecting pipe 8 is located inside the housing 1, and the other part is located outside the housing 1. In this embodiment, the valve 7 is an electrically controlled valve.

[0046] The control unit 17 includes a mounting bracket 174, a control circuit board 171, and a protective shell 173. The mounting bracket 174 is vertically mounted inside the shell 1. The gas storage tank 6 and the heating device 10 are located on the same side of the mounting bracket 174. The control circuit board 171 is mounted on the side of the mounting bracket 174 away from the heating device 10. A heat insulation layer 172 is also provided on the side of the mounting bracket 174 closest to the heating device 10. The protective shell 173 covers the control circuit board 171. The first temperature sensor 11, the heating device 10, and the valve 7 are electrically connected to the control circuit board 171. The micro-water collector 2 is communicatively connected to the control circuit board 171.

[0047] Terminal control device 5 is connected to control circuit board 171 for communication.

[0048] The specific working principle of the SF6 micro-water online monitoring device in this embodiment is as follows:

[0049] Step S1: After the terminal control device issues the cycle start command, the control circuit board 171 opens the valve 7 to release the gas in the sulfur hexafluoride storage chamber 4 to the storage tank 6.

[0050] Step S2: The control circuit board 171 starts the heating device 10. When the temperature value T1 detected by the first temperature sensor 11 exceeds the first set value (e.g., 90°C), the heating device 10 is immediately stopped. At this time, the temperature inside the gas storage tank 6 begins to drop. When the temperature inside the gas storage tank 6 drops, due to the principle of temperature drop and thermal expansion and contraction, the gas pressure inside the gas storage tank 6 drops. Since the valve 7 is normally open, the SF6 gas inside the high-voltage electrical equipment body can be "released" into the gas storage tank 6.

[0051] Step S3: After the temperature value T1 detected by the first temperature sensor 11 drops to the same level as the temperature value T2 detected by the temperature sensor in the micro water collector 2, the control circuit board 171 controls the micro water collector 2 to turn on. The micro water collector 2 starts to continuously test the micro water value H1. After the micro water value H1 obtained by the micro water collector 2 stabilizes, the micro water value H1 at this time is saved as the true micro water value of sulfur hexafluoride gas in the high-voltage electrical equipment body.

[0052] like Figure 5 As shown, in practical applications, for a high-voltage electrical equipment with multiple sulfur hexafluoride (SF6) storage chambers 4 (assuming a total number of N), an online SF6 moisture monitoring device corresponding to each of the SF6 storage chambers 4 in this embodiment can be installed. However, all the online SF6 moisture monitoring devices can share a single terminal control device 5 and be powered by the same power supply box 3. In this case, the terminal control device 5, the power supply box 3, and all the online SF6 moisture monitoring devices constitute a monitoring system.

[0053] In another alternative embodiment, each SF6 micro-water online monitoring device is powered separately. A power supply 18 is provided inside the housing 1. The power supply 18 is used to power the heating device 10, the micro-water collector 2, the first temperature sensor 11, and the control circuit board 171.

[0054] In the optional schemes of this embodiment, a preferred option is that valve 7 is a self-sealing valve or an electrically controlled valve. A self-sealing valve eliminates the need for frequent manual operation to open and close. During device startup, shutdown, and daily operation, the self-sealing valve automatically adjusts its opening and closing based on system pressure and gas flow, reducing the workload and the possibility of operator error. Operators do not need to spend a lot of time and energy checking and controlling the status of valve 7, allowing them to focus more on device data monitoring and equipment maintenance, thus improving work efficiency. This is particularly suitable for scenarios such as unattended substations, reducing labor costs and management difficulty. It is worth noting that in actual field applications, regardless of whether valve 7 is a self-sealing valve or an electrically controlled valve, once the SF6 micro-moisture online monitoring device is installed (i.e., connected to the sulfur hexafluoride gas storage chamber 4 inside the high-voltage electrical equipment), valve 7 is in a normally open state. Valve 7 only needs to be closed when it is necessary to disconnect the connection between connector 9 and the sulfur hexafluoride gas storage chamber 4 inside the high-voltage electrical equipment, disconnect the connection between connecting pipe 8 and connector 9, or disassemble and repair the SF6 micro-moisture online monitoring device, in order to prevent gas escape from the gas storage tank 6.

[0055] In this embodiment, a preferred option is that the insulation layer 172 is made of insulation cotton. Insulation cotton has excellent insulation properties, effectively preventing heat generated by the heating device 10 from being conducted to the control circuit board 171. Insulation cotton is lightweight and, compared to other insulation materials, does not add excessive weight or volume to the device. This makes installation and arrangement easier in situations with limited internal space, without significantly affecting the installation and layout of other components such as the gas tank 6 and the control circuit board 171. Simultaneously, its softness allows it to fit tightly against the surface of the mounting bracket 174, fully filling gaps and achieving better insulation, thus optimizing the utilization of internal space and enabling the components to work together compactly and orderly.

[0056] In the optional solutions of this embodiment, a fault indicator light (not shown in the figure) connected to the control circuit board 171 is more preferably included. The fault indicator light is set on the outer wall of the housing 1. The fault indicator light can intuitively show whether a fault has occurred during the operation of the device, so that the staff can find and deal with the problem in a timely manner.

[0057] like Figure 6As shown, in this embodiment, the control circuit board 171 includes a main control module 1718, a communication module 1717, a data acquisition module 1716, a power supply module 1712, a watchdog module 1713, a data storage module 1714, a fault indication module 1715, and a heating control module 1719. The main control module 1718 is the main module of the control circuit board 171. After receiving the data collected by the micro-water collector 2, the main control module 1718 uploads it through the communication module 1717. The main control module 1718 can coordinate the work of each module to realize the function of the control circuit board 171. The communication module 1717 is responsible for the communication between the control circuit board 171 and the terminal control device 5, and the communication between the control circuit board 171 and the micro-water collector 2. The communication between the control circuit board 171 and the micro-water collector 2 can collect the micro-water value transmitted by the micro-water collector 2. The communication between the control circuit board 171, the micro-water collector 2, and the terminal control device 5 is mainly completed by RS485. The data acquisition module 1716 is used to collect the detection value of the first temperature sensor 11. The power supply module... 1712 is connected to the input power supply 1711. The power supply module 1712 provides power input protection, power conversion, and electromagnetic isolation for the entire device. The power supply module 1712 enables the control circuit board 171 to work normally and ensures the stable operation of the downstream system. The watchdog module 1713 is a self-protection circuit for the control circuit board 171. Under the interference of the high-voltage power system, the control circuit board 171 will not crash under the action of the watchdog module 1713, ensuring the normal operation of the monitoring function of the trace moisture value in the sulfur hexafluoride gas chamber. The data storage module 1714 can store the heating cycle time period parameters and the collected trace moisture values ​​for easy access by users. The fault indication module 1715 is responsible for detecting the overall operating status of the device. When the device's operating status is abnormal, it sends a signal to the fault indicator light to alert the staff that the equipment has malfunctioned. The heating control module 1719 is used to control the opening and closing of the heating device 10 and also has a relay protection circuit to prevent the relay from abnormally engaging and failing to disconnect.

[0058] In the optional embodiments of this example, a preferred method is to use a computer, tablet computer, or mobile phone as the terminal control device 5. The terminal control device 5 is communicatively connected to the control circuit board 171, enabling remote control and data viewing of the monitoring device. This flexible connection method allows staff to monitor the state of SF6 gas inside high-voltage electrical equipment in real time without being physically present on-site. It is particularly suitable for scenarios such as unmanned substations, meeting the growing demand for remote control and telemetry, and improving the intelligent management level and continuous power supply capability of the power system.

[0059] In the optional scheme of this embodiment, a terminal block 14 is more preferably provided inside the housing 1. The signal lines of the control circuit board 171, the first temperature sensor 11 and the heating device 10 are respectively connected to the terminal block 14. The provision of the terminal block 14 makes the connection of the signal lines of the control circuit board 171, the sensor and the heating device 10 more orderly, which facilitates the inspection and maintenance of the circuit. At the same time, it is also conducive to the subsequent functional expansion and upgrading of the device, enhancing the practicality and versatility of the device.

[0060] In the optional embodiments of this invention, a preferred arrangement is that the control unit 17 is closer to the first movable door 19 than the gas tank 6, and the gas tank 6 is closer to the second movable door 20 than the control unit 17; the protective shell 173 is closer to the first movable door 19 than the mounting bracket 174. This layout allows maintenance personnel to quickly access the corresponding components through different movable doors as needed during maintenance, without requiring excessive disassembly of other components, greatly improving the convenience and efficiency of maintenance. Simultaneously, the detachable connection between the shell 1 and the first bracket 16 facilitates the inspection and maintenance of the overall structure within the shell 1, reducing maintenance costs and difficulty.

[0061] In the optional solutions of this embodiment, a plurality of wire-passing holes are provided on the side wall of the housing 1, which are used for passing power lines or signal lines; each wire-passing hole is provided with a gland 15, which not only facilitates the insertion and exit of power lines and signal lines, but also effectively prevents dust, moisture and other substances from entering the interior of the housing 1, thus providing good protection for the internal circuits and components.

[0062] In the optional embodiments of this invention, it is preferred that the housing 1, the first movable door 19, the second movable door 20, the first bracket 16, and the mounting bracket 174 are all made of stainless steel. High-voltage electrical equipment operates in complex environments, potentially exposed to moisture, acids, alkalis, and other corrosive factors. Stainless steel possesses extremely strong corrosion resistance, effectively resisting the erosion of equipment components by moisture and chemicals in the environment. Whether it is the housing 1, the first movable door 19, the second movable door 20, or the first bracket 16 and the mounting bracket 174, the stainless steel material prevents components from being damaged by corrosion, reduces the frequency of corrosion-related failures, greatly extends the overall service life of the equipment, and lowers equipment replacement and maintenance costs.

[0063] In one optional embodiment, connector 9 also has a fifth port, which is connected to an SF6 gas decomposition product content detection sensor. The SF6 gas decomposition product content detection sensor is used to monitor the content of SF6 gas decomposition products inside the high-voltage electrical equipment, and the SF6 gas decomposition product content detection sensor is communicatively connected to the control circuit board 171.

[0064] In an optional embodiment, a pressure sensor 12 can also be installed on the gas storage tank 6; the pressure sensor 12 is used to detect the pressure of the gas in the gas storage tank 6; the pressure sensor 12 is electrically connected to the control circuit board; the signal line of the pressure sensor 12 is connected to the terminal block 14 respectively; the acquisition module 1716 can also acquire the detection value of the pressure sensor 12.

[0065] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An online monitoring device for SF6 micro-water content, characterized in that, include: First support; A sealable housing, the bottom of which is detachably connected to the first bracket; the housing has a first movable door and a second movable door, which are distributed on both sides of the housing; A gas circulation unit includes a connecting pipe, a gas storage tank, a heating device for heating the gas storage tank, and a micro-water collector for detecting the gas in the gas circulation unit. The gas storage tank has a circulation vent connected to one end of the connecting pipe. The connecting pipe has a valve, and the other end is connected to a connector. The connector has a first port connected to the connecting pipe, a second port connected to a sulfur hexafluoride gas storage chamber inside high-voltage electrical equipment, a third port serving as a gas replenishment port, and a fourth port connected to the micro-water collector. The gas storage tank has a first temperature sensor for detecting the temperature of the gas inside the tank. Both the gas storage tank and the heating device are housed within the casing. The control unit includes a mounting bracket, a control circuit board, and a protective housing. The mounting bracket is disposed within the housing. The gas storage tank and the heating device are located on the same side of the mounting bracket. The control circuit board is mounted on the side of the mounting bracket away from the heating device. A heat insulation layer is also provided on the side of the mounting bracket closest to the heating device. The protective housing covers the control circuit board. The first temperature sensor and the heating device are electrically connected to the control circuit board. The micro-water collector is communicatively connected to the control circuit board. A terminal control device, which is communicatively connected to the control circuit board.

2. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The housing also contains a power source, which powers the heating device, the micro-water collector, the first temperature sensor, and the control circuit board.

3. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The valve is either a self-sealing valve or an electrically controlled valve.

4. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The insulation layer is made of insulation cotton.

5. The SF6 micro-water online monitoring device according to claim 1, characterized in that: It also includes a fault indicator light that is connected to the control circuit board.

6. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The terminal control device is a computer, tablet computer, or mobile phone.

7. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The housing is also provided with a terminal block, and the control circuit board, the first temperature sensor and the signal lines of the heating device are respectively connected to the terminal block.

8. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The control unit is closer to the first movable door than the gas tank, and the gas tank is closer to the second movable door than the control unit; the protective shell is closer to the first movable door than the mounting bracket.

9. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The side wall of the housing is provided with a number of wire-passing holes, which are used to pass power lines or signal lines; each wire-passing hole is provided with a gland.

10. The SF6 micro-water online monitoring device according to claim 1, characterized in that: The housing, the first movable door, the second movable door, the first bracket, and the mounting bracket are all made of stainless steel. The connector also has a fifth port, which is connected to an SF6 gas decomposition product content detection sensor.

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