Sulfur hexafluoride density micro-water sensor and control method

Abstract

The invention provides a sulfur hexafluoride density micro-water sensor and a control method thereof, which are specially used for monitoring key parameters, including pressure, temperature, dew point, sulfur hexafluoride gas concentration value and humidity, in sulfur hexafluoride gas insulation equipment in real time, and through a remote real-time monitoring function, the sulfur hexafluoride density micro-water sensor is obtained. Operation and maintenance personnel can obtain monitoring data in real time at the background data center without going to the site in person, and timely discover and process hidden dangers, so that the detection efficiency is greatly improved; the device comprises a shell, one end of the shell is provided with an aviation socket, the other end of the shell is provided with a connector, a sintering terminal is arranged in the center of the interior of the connector, an effective sealing state is formed between the connector and the shell, a control panel is arranged in the shell and connected to one end of the sintering terminal, and the control panel is connected to the other end of the sintering terminal. The other end of the sintering terminal is connected with a monitoring circuit board, the monitoring circuit board extends to the outer side of the connector, and a protective cover is arranged on the outer side of the monitoring circuit board.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a sulfur hexafluoride density micro-water sensor and a control method. Background Art

[0002] In the power system, sulfur hexafluoride is a high-performance insulating and arc-extinguishing medium, and its quality is directly related to the safe operation of electrical equipment and the stability of the system. However, trace moisture in sulfur hexafluoride gas will seriously affect its insulation performance, so the monitoring of sulfur hexafluoride trace moisture is particularly important.

[0003] 1. Ensure insulation performance: The insulation strength of sulfur hexafluoride gas is 2.33 times that of air, but moisture will significantly reduce its insulation performance. By monitoring the micro-water density, the problem of excessive moisture can be discovered and dealt with in a timely manner, thereby ensuring the insulation performance of the equipment.

[0004] 2. Prevent insulation failure: Continuous moisture monitoring helps predict and prevent potential insulation failures. Once the moisture content exceeds the standard, appropriate measures can be taken to intervene and avoid equipment damage and power outages.

[0005] At present, although there is a method of manually using a sulfur hexafluoride micro-water detector for on-site monitoring, this method has many shortcomings, such as low detection efficiency, failure to detect hidden dangers in a timely manner, and expensive detectors.

[0006] Low detection efficiency; Manual on-site testing requires operators to carry testers to the site to measure one by one, which is not only time-consuming, but also easily affected by various factors such as the on-site environment and equipment status. In addition, each test requires tedious preparation work, such as equipment connection and parameter setting, which further reduces the efficiency of testing.

[0007] Failure to detect hidden dangers in time; Manual on-site inspections are usually carried out regularly, which means there may be a time interval between two inspections. During this period, if the water content in the sulfur hexafluoride gas changes, especially when the water content exceeds the standard, manual inspections cannot detect and deal with these hidden dangers in time. This may lead to a decrease in the insulation performance of the equipment, a decrease in operational reliability, and even cause safety accidents.

[0008] The detector is expensive; High-quality sulfur hexafluoride water detectors are usually expensive, which may be a considerable expense for some power system operators with limited budgets. In addition, the maintenance and calibration of the detectors also require certain costs and time. These factors increase the cost of manual on-site testing.

[0009] Therefore, it is particularly important to develop a device that can monitor the pressure, temperature, dew point, ppm, humidity and other data of sulfur hexafluoride equipment in real time. The application of this comprehensive monitoring device will help improve the insulation performance of sulfur hexafluoride gas, extend the service life of the equipment, and reduce equipment damage and power outages. Summary of the invention

[0010] The present invention aims to address the technical defects of the prior art and provide a sulfur hexafluoride density micro-water sensor and a control method. The sensor is a highly integrated detection device specially designed for real-time monitoring of key parameters in sulfur hexafluoride gas insulation equipment, including pressure, temperature, dew point, sulfur hexafluoride gas concentration value and humidity. Through the remote real-time monitoring function, operation and maintenance personnel can obtain monitoring data in real time in the background data center without having to visit the site, so as to discover and deal with hidden dangers in time, thereby greatly improving the detection efficiency.

[0011] The present invention provides the following technical solutions: A sulfur hexafluoride density micro-water sensor comprises a shell, one end of which is provided with an air socket, the other end of which is provided with a connector, a sintered terminal is provided at the center of the connector, an effective sealing state is formed between the connector and the shell, a control board is provided in the shell, the control board is connected to one end of the sintered terminal, the other end of the sintered terminal is connected to a monitoring circuit board, the monitoring circuit board extends to the outside of the connector, and a protective cover is provided on the outside of the monitoring circuit board.

[0012] Furthermore, A 4-core aviation plug is bonded to the inner side of the aviation plug port, and the 4-core aviation plug is electrically connected to the control board.

[0013] Furthermore, An annular groove is formed at one end of the shell body fixedly connected to the connector, and corresponding screw holes are formed at corresponding positions of the connector, and the shell body and the connector are fixed by locking screws.

[0014] Furthermore, The control board includes a microcontroller, a signal acquisition module, a communication module, a power module, and a storage module. The output ends of the signal acquisition module and the power module are connected to the microcontroller, the output end of the microcontroller is connected to the communication module, and the signal acquisition module is electrically connected to a temperature sensor, a pressure sensor, and a capacitive humidity sensor.

[0015] Furthermore, The control board is also provided with a connecting piece, the control board is connected to the sintered terminal by welding, and a sealing ring is provided between the sintered terminal and the connecting piece.

[0016] Furthermore, The protective cover is configured as a hollow structure, one end of which is threadedly connected to the connector, and the other end is configured as an opening, and a plurality of through holes are provided on the protective cover.

[0017] Furthermore, The external thread of the connector is set to G1 / 2, and a groove for setting a polytetrafluoroethylene pad is provided on one side of the external thread of the connector.

[0018] Furthermore, The 4-core aviation plug is connected to a signal box on the device through a cable, and the cable includes 2 signal lines and 2 power lines.

[0019] Furthermore, The temperature sensor is a thin film platinum resistor pt1000; The pressure sensor is a waterproof air pressure sensor WF5803F; The capacitive humidity sensor is a capacitive humidity sensor K5-W.

[0020] The sulfur hexafluoride density micro-water sensor control method performs the following steps: (1) Connection and initialization: When connected to the sulfur hexafluoride equipment, the monitoring circuit board is responsible for monitoring the pressure value, temperature value and dew point value. The signal acquisition module collects the corresponding data on the monitoring circuit board and feeds it back to the microcontroller in real time for processing; (2) Data processing and conversion: The microcontroller receives the data from the signal acquisition module, processes the data and converts it into humidity and ppm values ​​according to a preset algorithm formula; (3) Data transmission: The microcontroller outputs the humidity, ppm value, pressure value, temperature value and dew point value to the communication module, and the communication module transmits the data to the signal box via a cable connected to a 4-core aviation plug.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a sulfur hexafluoride density micro-water sensor, which is a highly integrated detection device specially designed for real-time monitoring of key parameters in sulfur hexafluoride gas insulation equipment, including pressure, temperature, dew point, sulfur hexafluoride gas concentration (usually expressed in ppm) and humidity. This sensor greatly improves the detection efficiency through the remote monitoring function, so that the operation and maintenance personnel can obtain the required data in the background data center without going to the site in person; The pressure sensor is mainly composed of a shell, a connector, a sintered terminal, a control board, a monitoring circuit board and a protective cover. The shell is the main structure of the sensor. The shell is made of high-strength, corrosion-resistant materials to ensure the stability and durability of the sensor. One end of the shell is designed with an aviation socket, which is connected to the data transmission equipment to realize remote transmission and storage of data. The connector is located at the other end of the shell and is used to connect to the sulfur hexafluoride equipment. A sintered terminal is provided at the center of the connector. The terminal not only provides electrical connection, but also ensures that an effective sealing state is formed between the connector and the shell through a precise sealing design to prevent gas leakage and ensure measurement accuracy. The control board is located in the shell and is the core control unit of the sensor. It is responsible for receiving data from the monitoring circuit board, processing and analyzing it, and finally transmitting the processed data to the background data center through the aviation socket. The monitoring circuit board extends to the outside of the connector and directly contacts the monitored sulfur hexafluoride gas. Multiple sensors are integrated on the circuit board for real-time measurement of pressure, temperature, and dew point. These sensors transmit the measured data to the control board. The protective cover is located on the outside of the monitoring circuit board to protect the circuit board from interference and damage from the external environment. Based on the above structural characteristics, this device has the following advantages: 1. Real-time monitoring: The sensor can monitor the key parameters of the sulfur hexafluoride equipment in real time, ensuring that the operation and maintenance personnel can understand the operating status of the equipment in a timely manner; 2. Remote transmission: Connect to the back-end data center through the aviation socket to achieve remote transmission and storage of data, thus improving detection efficiency; 3. High-precision measurement: using advanced sensor technology and precise sealing design to ensure the accuracy and reliability of measurement data; In summary, the sulfur hexafluoride density micro-water sensor is an efficient, accurate and reliable monitoring device that can monitor the key parameters in sulfur hexafluoride equipment in real time, provide strong data support for operation and maintenance personnel, and ensure the safe and stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a three-dimensional structure of a specific embodiment of the present invention; Figure 2 for Figure 1 An exploded view of the illustrated embodiment; Figure 3 is a schematic diagram of the three-dimensional structure of the connector; Figure 4 is a schematic diagram of the three-dimensional structure of the shell; Figure 5 It is a control structure diagram of the present invention.

[0023] Description of reference numerals: 1. Shell; 2. Control board; 3. 4-core aviation plug; 4. Connector; 5. Sintered terminal; 6. Monitoring circuit board; 7. Protective cover; 8. Connector; 9. Groove; 10. Screw hole; 201, microcontroller; 202, communication module; 203, power module; 204, storage module; 205, signal acquisition module; 601, temperature sensor; 602, pressure sensor; 603, capacitive humidity sensor. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0025] like Figures 1 to 5 As shown, it shows a specific embodiment of the present invention: like Figures 1 to 5 As shown, the sulfur hexafluoride density micro-water sensor disclosed in the present invention includes a shell 1, one end of the shell 1 is provided with an aviation socket, the other end of the shell 1 is provided with a connector 8, a sintered terminal 5 is provided at the center position inside the connector 8, an effective sealing state is formed between the connector 8 and the shell 1, a control board 2 is arranged in the shell 1, the control board 2 is connected to one end of the sintered terminal 5, the other end of the sintered terminal 5 is connected to a monitoring circuit board 6, the monitoring circuit board 6 extends to the outside of the connector 8, wherein a protective cover 7 is arranged on the outside of the monitoring circuit board 6.

[0026] The working principle of the present invention is as follows: when the sensor is connected to the sulfur hexafluoride equipment, the sensor on the monitoring circuit board 6 starts to measure the pressure, temperature, dew point and other parameters inside the equipment in real time. These measurement data are transmitted to the control board 2 through the sintered terminal 5 for processing and analysis. The control board 2 transmits the processed data to the background data center through the navigation socket for the operation and maintenance personnel to view and analyze. The dew point value monitored in the monitoring circuit board 6 is monitored by a capacitive humidity sensor 603. When the dew point changes, the capacitive humidity sensor 603 will have a corresponding relative change in capacitance. In order to ensure the measurement accuracy of the capacitive humidity sensor 603, a sulfur hexafluoride density micro-water detector is required to perform dew point calibration before leaving the factory. During the dew point calibration process, the sulfur hexafluoride density micro-water detector is used to provide an environment with a known dew point. By placing the capacitive humidity sensor 603 in the environment and measuring the change of its capacitance value, the dew point calibration of the sensor can be achieved to ensure the reliability and accuracy of the sensor in practical applications. At the same time, the microcontroller 201 obtains the humidity and sulfur hexafluoride gas concentration (usually expressed in ppm) according to the monitored pressure value, temperature value, and dew point value according to the preset algorithm formula, where the formula is: e(equilibrium vapor pressure) = pow(10.0,10.286-1779.7378 / (draw_temp(dew point)+273.15-35.85)) E(saturated water vapor pressure) = pow(10.0f,(10.286*(TEMP(temperature)+273.15)-2148.4909) / ((TEMP(temperature)+273.15)-35.85)) RH(humidity)=e*100 / E ppm (water content) = 1000000.0*e / (PRESS (pressure)*1000.0-e), where pow(x,y) is: x to the power of y.

[0027] Preferably, Figures 1-2 As shown, a 4-core aviation plug 3 is bonded to the inner side of the aviation plug port, and the 4-core aviation plug 3 is electrically connected to the control board 2 .

[0028] In the sulfur hexafluoride density micro-water sensor, the 4-core aviation plug 3 is used to realize the electrical connection and data transmission between the sensor and external equipment.

[0029] The aviation socket is an interface on the sensor housing 1 for fixing the aviation plug, and is usually firmly connected by adhesive or other fixing methods. This connection method can ensure that the 4-core aviation plug 3 will not loosen or fall off during the use of the sensor, thereby ensuring the stability and reliability of the electrical connection.

[0030] Once the 4-core aviation plug 3 is electrically connected to the control board 2, the sensor can transmit data through the 4-core aviation plug 3. The wires in the 4-core aviation plug 3 are used to transmit the pressure, temperature, dew point, ppm and humidity of the sulfur hexafluoride equipment monitored by the sensor. These data are transmitted to the backend data center through the 4-core aviation plug 3.

[0031] The 4-core aviation plug 3 can also be used to transmit power signals to realize external power supply for the sensor.

[0032] In summary, the above connection methods ensure reliable electrical connection and data transmission between the sensor and external devices, providing a basis for real-time monitoring and remote data transmission of the sensor.

[0033] Preferably, Figures 2 to 4 As shown, an annular groove 9 is formed at one end of the housing 1 fixedly connected to the connector 8, and corresponding screw holes 10 are formed at corresponding positions of the connector 8. The housing 1 and the connector 8 are fixed by locking screws.

[0034] The fixed connection between the shell 1 and the connector 8 is achieved through a special design, that is, a circle of annular grooves 9 are opened on the shell 1, and relative screw holes 10 are opened at corresponding positions on the connector 8, and the two are fixedly connected by locking screws.

[0035] The annular groove 9 is formed at the end where the housing 1 and the connector 8 need to be fixedly connected. The groove 9 is annular, which means that it extends around a circumference of the housing 1, providing a stable support surface for the connector 8. It is mainly to cooperate with the screw hole 10 on the connector 8, and the two are tightly fixed together by locking the screws. This design not only enhances the stability of the connection, but also makes it easier to disassemble and replace the connector 8.

[0036] During installation, the locking screw is screwed into the screw hole 10 of the connector 8 and passed through the annular groove 9 of the housing 1, and is tightened until the screw fits tightly against the housing 1 to form a stable connection. The function of the locking screw is to firmly fix the housing 1 and the connector 8 together to prevent relative movement or loosening between the two. This connection method not only has high strength and stability, but also can withstand certain vibrations and shocks.

[0037] In summary, the fixed connection between the shell 1 and the connector 8 through the annular groove 9, the screw hole 10 and the locking screw is a stable and detachable connection method, which is suitable for various application scenarios requiring high stability and reliability.

[0038] Preferably, Figure 5 As shown, the control board 2 includes a microcontroller 201, a signal acquisition module 205, a communication module 202, a power module 203, and a storage module 204. The output ends of the signal acquisition module 205 and the power module 203 are connected to the microcontroller 201, the output end of the microcontroller 201 is connected to the communication module 202, and the signal acquisition module 205 is electrically connected to the temperature sensor 601, the pressure sensor 602, and the capacitive humidity sensor 603.

[0039] The control board 2 is a system integrating multiple functional modules, mainly including a microcontroller 201, a signal acquisition module 205, a communication module 202, a power module 203 and a storage module 204. These modules are electrically connected to realize data transmission and control, and together constitute the core functions of the control board 2.

[0040] The microcontroller 201 serves as the core processor of the control board 2 , and is responsible for receiving and processing data from the signal acquisition module 205 , executing a preset control algorithm, and exchanging data with other devices or systems through the communication module 202 .

[0041] The input end of the microcontroller 201 is connected to the output end of the signal acquisition module 205 and the power module 203 to receive sensor data and power supply; and the output end is connected to the communication module 202 to send control instructions and data.

[0042] The signal acquisition module 205 is responsible for collecting data from various sensors, such as temperature, pressure, humidity, etc., and converting these data into electrical signals that can be recognized by the microcontroller 201.

[0043] The output end of the signal acquisition module 205 is connected to the input end of the microcontroller 201. In addition, it is also electrically connected to the temperature sensor 601, the pressure sensor 602 and the capacitive humidity sensor 603, which are used for real-time operation status value of sulfur hexafluoride equipment, and are applicable to various sulfur hexafluoride gas insulation equipment, such as GIS, transformers, mutual inductors, etc.

[0044] The communication module 202 realizes data communication between the control board 2 and other devices or systems. The input end of the communication module 202 is connected to the output end of the microcontroller 201 to receive control instructions and data from the microcontroller 201; its output end is connected to the communication interface of the external device or system to realize data transmission and exchange.

[0045] The power module 203 provides a stable power supply to each module on the control board 2 to ensure the normal operation of the system; The output end of the power module 203 is connected to the input end of the microcontroller 201 and the power supply end of the signal acquisition module 205 to provide them with the required voltage and current.

[0046] The storage module 204 is used to store information such as data, control algorithms, configuration parameters, etc. generated by the control board 2 during operation.

[0047] The storage module 204 and the microcontroller 201 are electrically connected to implement data read and write operations. The microcontroller 201 can store processed data or configuration parameters in the storage module 204 for subsequent use or analysis.

[0048] The signal acquisition module 205 is electrically connected to the temperature sensor 601, the pressure sensor 602 and the capacitive humidity sensor 603. These sensors are responsible for real-time acquisition of the operating state parameters of the sulfur hexafluoride equipment, and convert the acquired data into electrical signals and transmit them to the signal acquisition module 205. The signal acquisition module 205 then converts these electrical signals into digital signals that can be recognized by the microcontroller 201 for processing and analysis by the microcontroller 201.

[0049] The workflow of control board 2: The power module 203 provides a stable power supply for the control board 2 .

[0050] The signal acquisition module 205 collects data from the sensor in real time and converts the data into electrical signals that can be recognized by the microcontroller 201 .

[0051] The microcontroller 201 receives data from the signal acquisition module 205, executes a preset control algorithm, and generates a control instruction according to the algorithm result.

[0052] The communication module 202 transmits the control instructions generated by the microcontroller 201 to external devices to achieve data communication and exchange.

[0053] The storage module 204 is used to store various data and information generated by the control board 2 during operation for subsequent use or analysis.

[0054] In summary, the control panel 2 is a system integrating multiple functional modules, and the real-time monitoring and control of environmental parameters such as temperature, pressure, and humidity are achieved through the collaborative work between the modules.

[0055] Preferably, Figure 2 As shown, a connecting piece 4 is further provided on the control board 2 , the control board 2 is connected to a sintered terminal 5 by welding, and a sealing ring is provided between the sintered terminal 5 and the connecting piece 4 .

[0056] The arrangement of the connector 4 on the control board 2 is crucial to ensure stable connection with components such as the sintered terminal 5 and to achieve sealing between the connector 8 and the housing, especially in the arrangement of the monitoring circuit board 6 where the sensor is in direct contact with the sulfur hexafluoride device.

[0057] like Figure 2 As shown, the connector 4 is a well-designed annular component, the shape and size of which are precisely calculated to ensure a close fit with components such as the sintered terminal 5. This annular design not only provides a larger contact area, but also enhances the stability of the connection.

[0058] In this embodiment, since the sintered terminal 5 has been welded to the control board 2, the connector 4 may be connected to the sintered terminal 5 by crimping. In order to ensure the sealing between the connector 8 and the housing, the connector 4 is designed to include a sealing groove structure, which can accommodate sealing materials such as a sealing ring or a sealant, thereby effectively preventing external gas from entering the connection part.

[0059] The key to achieving sealing is to arrange a sealing ring between the connector 4 and the housing. The sealing ring is usually made of elastic materials, such as rubber, silicone, etc. These materials can provide good sealing performance and adapt to different temperature and pressure conditions. During installation, it is necessary to ensure that the sealing ring is correctly positioned, tightly installed, and not damaged or deformed.

[0060] Since the monitoring circuit board 6 of the sensor is arranged at the connection between the connector 8 and the sulfur hexafluoride device, and is in direct contact with the gas of the sulfur hexafluoride device, extremely high requirements are placed on its sealing. Sulfur hexafluoride is a colorless, odorless, non-toxic gas, but it will decompose and produce toxic and harmful substances when it comes into contact with air. Therefore, if the sensor leaks, it will not only affect the accuracy of its monitoring results, but also cause the sulfur hexafluoride gas pressure inside the sulfur hexafluoride device to drop, reducing the insulation performance. The reduction in insulation performance may cause equipment failure, arc discharge, and even fire accidents.

[0061] In summary, the arrangement of the connector 4 on the control board 2 is crucial to ensure stable connection with components such as the sintered terminal 5 and to achieve sealing between the connector 8 and the housing. In the special application environment of this sensor, special attention should be paid to the design and testing of sealing to ensure safe and reliable operation of the system.

[0062] Preferably, Figures 1-2 As shown, the protective cover 7 is configured as a hollow structure, one end of which is threadedly connected to the connector 8, and the other end is configured as an opening, and a plurality of through holes are provided on the protective cover 7.

[0063] It can be seen from the figure that the protective cover 7 is arranged on the outer circle of the monitoring circuit board 6, aiming to provide necessary protection while ensuring that the accuracy of monitoring is not affected.

[0064] The protective cover 7 is designed as a hollow structure, and the other end of the hollow structure is set as an opening. The hollow structure of the protective cover 7 can wrap the monitoring circuit board 6 inside, playing a good physical isolation role, and preventing the circuit board 6 from being damaged by direct impact of external objects. This design not only reduces the weight of the protective cover 7, but also allows sulfur hexafluoride gas to flow, which does not affect its monitoring while protecting the monitoring circuit board 6. The protective cover 7 is fixed by a threaded connection with the connector 8 at one end. This connection method is both firm and easy to operate, ensuring the stability of the protective cover 7 during the monitoring process.

[0065] The monitoring circuit board 6 is inserted into the sulfur hexafluoride device for gas monitoring. It needs to be in full contact with the gas in the device to accurately detect the gas pressure, temperature, dew point and other parameters. The through holes opened on the protective cover 7 allow the sulfur hexafluoride gas in the device to smoothly enter the protective cover 7 and contact with the sensors and other components on the monitoring circuit board 6, thereby ensuring that the monitoring circuit board 6 can monitor the gas status in real time and accurately.

[0066] Preferably, the external thread of the connector 8 is set to G1 / 2, and a groove 9 for setting a polytetrafluoroethylene pad is provided on one side of the external thread of the connector 8.

[0067] The external thread of the connector 8 is set to G1 / 2, and a groove 9 for setting a polytetrafluoroethylene pad is opened on one side thereof. This design is mainly to improve the sealing performance and avoid the problem of sulfur hexafluoride gas leakage inside the sulfur hexafluoride equipment.

[0068] The setting of G1 / 2 external thread is mainly to match the equipment interface. If it does not match the equipment connector, an adapter should be selected for installation according to the actual situation on site. Among them, G1 / 2 external thread is a common interface, which is more convenient to use an adapter. It has the characteristics of tight connection and good sealing.

[0069] A groove 9 is provided on one side of the external thread of the connector 8, and a PTFE pad is arranged therein, in order to further improve the sealing of the connection. The PTFE pad is a commonly used sealing material with excellent corrosion resistance, high temperature resistance and wear resistance. When the connector 8 is connected to the pipe or interface, the PTFE pad will be compressed and filled in the gap between the threads, thereby forming a tight sealing layer.

[0070] The addition of PTFE pads can significantly reduce the leakage channels between threads, thereby improving the sealing of the connection. This is especially important for equipment with high airtightness requirements. The compression deformation of the PTFE pad can absorb small errors in the connection process, thereby enhancing the stability and reliability of the connection. The corrosion resistance and wear resistance of the PTFE pad can ensure that the connector 8 maintains good sealing performance during long-term use and prolongs its service life.

[0071] The connector 8 with G1 / 2 external thread and PTFE pad plays an important role. Its good sealing performance is the key to ensure the safe and stable operation of the system.

[0072] Preferably, Figures 1-2 As shown, the 4-core aviation plug 3 is connected to the signal box on the device through a cable, and the cable includes 2 signal lines and 2 power lines.

[0073] The cable includes 2 signal wires and 2 power wires. These two types of wires have different functions in the cable: Signal lines are used to transmit communication signals or data between devices. They transmit digital or analog signals between devices.

[0074] Power cord: used to provide power to ensure the normal operation of the equipment. It usually has a large current carrying capacity to meet the power supply needs of the equipment. It transmits electrical energy from the power supply device to the power-consuming device.

[0075] The 4 pins of the 4-core aviation plug 3 are connected to the 2 signal wires and 2 power wires in the cable respectively. This connection ensures the reliability of power supply and signal transmission between devices.

[0076] In summary, the 4-core aviation plug 3 is connected to the signal box on the equipment through a cable, and the cable includes 2 signal lines and 2 power lines. The design has the advantages of high reliability, easy maintenance and flexibility.

[0077] Preferably, the temperature sensor 601 is a thin film platinum resistor pt1000; The pressure sensor 602 is a waterproof air pressure sensor WF5803F; The capacitive humidity sensor 603 is a capacitive humidity sensor K5-W.

[0078] The temperature sensor 601 uses a thin film platinum resistor PT1000; The thin film platinum resistor PT1000 is a thermal resistor based on platinum material, and its resistance changes with temperature. This change is linear, that is, the resistance is proportional to the temperature.

[0079] At 0°C, the resistance of PT1000 is 1000 ohms, a characteristic that makes it highly recognizable.

[0080] As the temperature increases, the resistance of PT1000 increases linearly, and this characteristic makes it highly accurate in temperature measurement.

[0081] Thin film platinum resistors have excellent measurement accuracy, good stability and reliability.

[0082] Due to its high precision and stability, it is also often used in situations where precise temperature control is required.

[0083] The pressure sensor 602 uses the waterproof air pressure sensor WF5803F; The waterproof air pressure sensor WF5803F is an air pressure sensor based on the Wheatstone bridge principle. It uses diffused resistors on a single crystal silicon wafer to detect small changes in resistance value and convert them into air pressure signals.

[0084] Its measuring range is 100KPA, relative accuracy is ±0.3KPA, and resolution is as high as 0.001KPA. These parameters make WF5803F have high accuracy and high resolution in air pressure measurement.

[0085] The operating temperature range is -40~85℃, and the temperature accuracy is ±1℃. It is suitable for air pressure measurement under various ambient temperatures.

[0086] It adopts stainless steel ring surface and substrate packaging, complies with RoHS standards and has good waterproof performance.

[0087] Suitable for other occasions that require accurate measurement of air pressure.

[0088] Capacitive humidity sensor 603 uses capacitive humidity sensor K5-W; The sensitive element of the capacitive humidity sensor K5-W is a humidity-sensitive capacitor, whose main material is a high molecular polymer or metal oxide. These materials have a strong adsorption capacity for water molecules, and the amount of water adsorbed varies with the ambient humidity. Since water molecules have a large electric dipole moment, the dielectric constant of the material changes after absorbing water, thereby changing the capacitance value of the capacitor. By measuring the change in capacitance value, the humidity of the environment can be inferred.

[0089] It is often used in situations where humidity needs to be accurately measured. The dew point value in the monitoring circuit board 6 is monitored by a capacitive humidity sensor 603. When the dew point changes, the capacitance humidity sensor 603 will have a corresponding relative change in capacitance. In order to ensure the measurement accuracy of the capacitive humidity sensor 603, it is necessary to use a sulfur hexafluoride density micro-water detector to calibrate the dew point before leaving the factory. During the dew point calibration process, the sulfur hexafluoride density micro-water detector is used to provide an environment with a known dew point. By placing the capacitive humidity sensor 603 in this environment and measuring the change in its capacitance value, the dew point calibration of the sensor can be achieved, ensuring the reliability and accuracy of the sensor in practical applications.

[0090] The sulfur hexafluoride density micro-water sensor control method performs the following steps: (1) Connection and initialization: connected to the sulfur hexafluoride equipment, the monitoring circuit board 6 is responsible for monitoring the pressure value, temperature value and dew point value, and the signal acquisition module 205 collects the corresponding data on the monitoring circuit board 6 and feeds it back to the microcontroller 201 in real time for processing; (2) Data processing and conversion: The microcontroller 201 receives the data transmitted by the signal acquisition module 205, and processes the data and converts the humidity and sulfur hexafluoride gas concentration values ​​according to a preset algorithm formula; (3) Data transmission: The microcontroller 201 outputs the humidity, sulfur hexafluoride gas concentration value, pressure value, temperature value and dew point value to the communication module 202, and the communication module 202 transmits the data to the signal box via a cable connected to the 4-core aviation plug 3.

[0091] After installing the sulfur hexafluoride density micro-water sensor on the test column of the sulfur hexafluoride equipment, connect the test column with the sulfur hexafluoride gas source to make full contact between the sensor and the sulfur hexafluoride gas. After confirming that the pipeline connection is correct, turn on the sensor power supply and start the sensor.

[0092] The performance of this sensor was tested, and the test data is shown in Table 1: Dew point gradient (°C) Temperature error / accuracy (°C) / (%) Dew point error (°C) Stability (°C) Accuracy(%) Responsiveness(min) Repeatability error (°C) -50 to -45 0.5 / 0.01% ±1.5 ±1.5 0.01% 15 ±1.0 -45 to -40 0.5 / 0.01% ±1.5 ±1.5 0.01% 10 ±1.0 -40 to -35 0.5 / 0.01% ±1.0 ±0.8 0.01% 8 ±0.8 -35 to -30 0.5 / 0.01% ±1.0 ±0.5 0.01% 6 ±0.8 -30 to -25 0.5 / 0.01% ±1.0 ±0.5 0.01% 4 ±0.8 -25 to -20 0.5 / 0.01% ±1.0 ±0.3 0.01% 3 ±0.5 -20 to -15 0.5 / 0.01% ±1.0 ±0.3 0.01% 2 ±0.5 -15 to -10 0.5 / 0.01% ±1.0 ±0.3 0.01% 2 ±0.5 -10 to -5 0.5 / 0.01% ±1.0 ±0.2 0.01% 2 ±0.5 -5 to 0 0.5 / 0.01% ±1.0 ±0.2 0.01% 2 ±0.5 It can be seen from Table 1 that the sensor has high test accuracy, can meet the requirements of the site, and can monitor the pressure, temperature, dew point, ppm, humidity and other data of the sulfur hexafluoride equipment in real time. The application of this comprehensive monitoring device will help improve the insulation performance of sulfur hexafluoride gas, extend the service life of the equipment, and reduce equipment damage and power outages.

[0093] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention. These changes involve related technologies well known to those skilled in the art, which all fall within the scope of protection of the patent of the present invention.

[0094] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. Sulfur hexafluoride density micro-water sensor, characterized in that, The invention comprises a shell (1), wherein one end of the shell (1) is provided with an aviation socket, the other end of the shell (1) is provided with a connector (8), a sintered terminal (5) is provided at the center position inside the connector (8), an effective sealing state is formed between the connector (8) and the shell (1), a control board (2) is provided inside the shell (1), the control board (2) is connected to one end of the sintered terminal (5), the other end of the sintered terminal (5) is connected to a monitoring circuit board (6), the monitoring circuit board (6) extends to the outside of the connector (8), wherein a protective cover (7) is provided on the outside of the monitoring circuit board (6).

2. The sulfur hexafluoride density micro-water sensor according to claim 1, characterized in that: A 4-core aviation plug (3) is bonded to the inner side of the aviation plug port, and the 4-core aviation plug (3) is electrically connected to the control board (2).

3. The sulfur hexafluoride density micro-water sensor according to claim 2, characterized in that: An annular groove (9) is formed at one end of the housing (1) where the housing (1) is fixedly connected to the connector (8), and a corresponding screw hole (10) is formed at a corresponding position of the connector (8). The housing (1) and the connector (8) are fixedly secured by means of locking screws.

4. The sulfur hexafluoride density micro-water sensor according to any one of claims 1 to 3, characterized in that: The control panel (2) comprises a microcontroller (201), a signal acquisition module (205), a communication module (202), a power module (203), and a storage module (204); the output ends of the signal acquisition module (205) and the power module (203) are connected to the microcontroller (201); the output end of the microcontroller (201) is connected to the communication module (202); and the signal acquisition module (205) is electrically connected to a temperature sensor (601), a pressure sensor (602), and a capacitive humidity sensor (603).

5. The sulfur hexafluoride density micro-water sensor according to claim 4, characterized in that: A connecting piece (4) is also provided on the control board (2), the control board (2) is connected to the sintered terminal (5) by welding, and a sealing ring is provided between the sintered terminal (5) and the connecting piece (4).

6. The sulfur hexafluoride density micro-water sensor according to claim 5, characterized in that: The protective cover (7) is configured as a hollow structure, one end of which is threadedly connected to the connector (8), and the other end of which is configured as an opening, and a plurality of through holes are provided on the protective cover (7).

7. The sulfur hexafluoride density micro-water sensor according to claim 6, characterized in that: The external thread of the connector (8) is set to G1 / 2, and a groove (9) for arranging a polytetrafluoroethylene pad is provided on one side of the external thread of the connector (8).

8. The sulfur hexafluoride density micro-water sensor according to claim 7, characterized in that: The 4-core aviation plug (3) is connected to a signal box on the device via a cable, wherein the cable includes 2 signal wires and 2 power wires.

9. The sulfur hexafluoride density micro-water sensor according to claim 8, characterized in that: The temperature sensor (601) is a thin film platinum resistor pt1000; The pressure sensor (602) is a waterproof air pressure sensor WF5803F; The capacitive humidity sensor (603) is a capacitive humidity sensor K5-W.

10. Sulfur hexafluoride density micro-water sensor control method, characterized in that: Using the sulfur hexafluoride density micro-water sensor as described in any one of claims 1 to 9, perform the following steps: (1) Connection and initialization; connected to the sulfur hexafluoride device, the monitoring circuit board (6) is responsible for monitoring the pressure value, temperature value and dew point value, and the signal acquisition module (205) collects the corresponding data on the monitoring circuit board (6) and feeds it back to the microcontroller (201) in real time for processing; (2) Data processing and conversion: The microcontroller (201) receives data transmitted by the signal acquisition module (205), and according to a preset algorithm formula, the microcontroller (201) processes the data and converts the humidity and sulfur hexafluoride gas concentration values; (3) Data transmission: the microcontroller (201) outputs the humidity, sulfur hexafluoride gas concentration value, pressure value, temperature value and dew point value to the communication module (202), and the communication module (202) transmits the data to the signal box via a cable connected to the 4-core aviation plug (3).

Images