Sulfur hexafluoride density micro-water sensor and control method

Abstract

The present invention provides a sulfur hexafluoride density micro-water sensor and a control method, which are specifically used 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, promptly discover and deal with hidden dangers, and greatly improve detection efficiency; the present invention includes a shell, one end of the shell is provided with an aviation socket, the other end of the shell is provided with a connector, the center position of the connector is provided with a sintered terminal, and 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, and 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.

Description

Technical Field

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

[0002] In power systems, sulfur hexafluoride (SF6) is a high-performance insulating and arc-extinguishing medium, and its quality is directly related to the safe operation of electrical equipment and system stability. However, trace amounts of water in SF6 gas can seriously affect its insulation properties, making monitoring of SF6 water content particularly important.

[0003] 1. Ensure insulation performance: The dielectric strength of sulfur hexafluoride gas is 2.33 times that of air, but moisture significantly reduces its insulation performance. By monitoring the water density, excessive moisture can be detected and addressed promptly, thereby ensuring the insulation performance of the equipment.

[0004] 2. Preventing Insulation Failures: Continuous moisture monitoring helps predict and prevent potential insulation failures. Once excessive moisture levels are detected, appropriate intervention measures can be taken to 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, inability to detect hidden dangers in a timely manner, and expensive detectors.

[0006] 1. Low detection efficiency;

[0007] Manual on-site testing requires operators to carry testers to the site and perform measurements one by one. This is not only time-consuming but also susceptible to various factors, such as the on-site environment and equipment status. In addition, each test requires tedious preparation, such as connecting equipment and setting parameters, further reducing testing efficiency.

[0008] 2. Failure to detect hidden dangers in a timely manner;

[0009] Manual on-site inspections are typically performed periodically, which means there may be a gap between inspections. During this time, if the moisture content in the sulfur hexafluoride gas changes, especially if it exceeds the standard, manual inspections cannot detect and address these hidden dangers in a timely manner. This can lead to degraded equipment insulation performance, reduced operational reliability, and even safety accidents.

[0010] 3. The detector is expensive;

[0011] High-quality sulfur hexafluoride water detectors are typically expensive, which can be a significant expense for power system operators with limited budgets. Furthermore, maintenance and calibration of the detectors require significant expense and time. These factors all increase the cost of manual on-site testing.

[0012] 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 such a 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

[0013] The present invention aims to address the technical deficiencies of the prior art and provides a sulfur hexafluoride density micro-water sensor and control method. The sensor is a highly integrated detection device specifically designed for real-time monitoring of key parameters in sulfur hexafluoride gas-insulated equipment, including pressure, temperature, dew point, sulfur hexafluoride gas concentration, and humidity. Through its remote real-time monitoring function, operation and maintenance personnel can obtain monitoring data in real time in a backend data center without having to visit the site in person, thereby promptly identifying and addressing potential risks and greatly improving detection efficiency.

[0014] The present invention provides the following technical solutions:

[0015] A sulfur hexafluoride density micro-water sensor includes a shell, one end of which is provided with an navigation socket, the other end of which is provided with a connector, a sintered terminal is provided at the center position inside the connector, and 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, and the other end of the sintered terminal is connected to a monitoring circuit board, which extends to the outside of the connector, wherein a protective cover is provided on the outside of the monitoring circuit board.

[0016] Further,

[0017] A 4-core aviation plug is bonded to the inner side of the aviation socket, and the 4-core aviation plug is electrically connected to the control board.

[0018] Further,

[0019] An annular groove is provided at one end of the shell body that is fixedly connected to the connector, and corresponding screw holes are provided at corresponding positions of the connector, and the shell body and the connector are fixed by locking screws.

[0020] Further,

[0021] 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 the temperature sensor, the pressure sensor, and the capacitive humidity sensor.

[0022] Further,

[0023] The control board is further 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.

[0024] Further,

[0025] 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.

[0026] Further,

[0027] The external thread of the connector is set to G1 / 2, and a groove for arranging a PTFE pad is provided on one side of the external thread of the connector.

[0028] Further,

[0029] The 4-core aviation plug is connected to the signal box on the device through a cable, and the cable includes 2 signal lines and 2 power lines.

[0030] Further,

[0031] The temperature sensor is a thin film platinum resistor pt1000;

[0032] The pressure sensor is a waterproof air pressure sensor WF5803F;

[0033] The capacitive humidity sensor is a capacitive humidity sensor K5-W.

[0034] The sulfur hexafluoride density micro-water sensor control method performs the following steps:

[0035] (1) Connection and initialization: Connect to the sulfur hexafluoride equipment, the monitoring circuit board is responsible for monitoring the pressure value, temperature value and dew point value, and 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;

[0036] (2) Data processing and conversion: The microcontroller receives the data from the signal acquisition module, processes the data according to the preset algorithm formula, and converts the data into humidity and ppm values;

[0037] (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 through a cable connected by a 4-core aviation plug.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention discloses a sulfur hexafluoride density micro-water sensor, a highly integrated detection device specifically designed for real-time monitoring of key parameters in sulfur hexafluoride gas-insulated equipment, including pressure, temperature, dew point, sulfur hexafluoride gas concentration (typically expressed in ppm), and humidity. This sensor significantly improves detection efficiency through its remote monitoring function, allowing operations and maintenance personnel to obtain required data in a backend data center without having to visit the site.

[0040] The pressure sensor is mainly composed of a housing, a connector, a sintered terminal, a control board, a monitoring circuit board, and a protective cover. The housing is the main structure of the sensor and is made of high-strength, corrosion-resistant materials to ensure the stability and durability of the sensor. One end of the housing is designed with an aviation socket for connecting to data transmission equipment to achieve remote data transmission and storage. The connector is located at the other end of the housing and is used to connect to the sulfur hexafluoride equipment. A sintered terminal is located in the center of the connector. This terminal not only provides an electrical connection, but also, through a precise sealing design, ensures an effective seal between the connector and the housing to prevent gas leakage and ensure measurement accuracy. The control board is located in the housing 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 ultimately transmitting the processed data to the background data center through the aviation socket. The monitoring circuit board extends outside the connector and is in direct contact with the monitored sulfur hexafluoride gas. The circuit board is integrated with multiple sensors 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 outside the monitoring circuit board to protect the circuit board from interference and damage from the external environment.

[0041] Based on the above structural characteristics, this device has the following advantages:

[0042] 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;

[0043] 2. Remote transmission: Connecting to the background data center through the aviation socket enables remote transmission and storage of data, improving detection efficiency;

[0044] 3. High-precision measurement: using advanced sensor technology and precise sealing design to ensure the accuracy and reliability of measurement data;

[0045] In summary, the sulfur hexafluoride density micro-water sensor is an efficient, accurate and reliable monitoring device that can monitor 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

[0046] Figure 1 A schematic diagram of the three-dimensional structure of a specific embodiment of the present invention;

[0047] Figure 2 for Figure 1 An exploded view of the illustrated embodiment;

[0048] Figure 3 Schematic diagram of the three-dimensional structure of the connector;

[0049] Figure 4 Schematic diagram of the three-dimensional structure of the shell;

[0050] Figure 5 This is a control structure diagram of the present invention.

[0051] Description of reference numerals:

[0052] 1. Housing; 2. Control board; 3. 4-core aviation plug; 4. Connectors; 5. Sintered terminals; 6. Monitoring circuit board; 7. Protective cover; 8. Connector; 9. Annular groove; 10. Screw hole;

[0053] 201, microcontroller; 202, communication module; 203, power module; 204, storage module; 205,

[0054] Signal acquisition module;

[0055] 601, temperature sensor; 602, pressure sensor; 603, capacitive humidity sensor. DETAILED DESCRIPTION

[0056] 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 this field based on the embodiments of the present invention without making any creative work shall fall within the scope of protection of the present invention.

[0057] like Figures 1 to 5 As shown, it shows a specific embodiment of the present invention:

[0058] like Figures 1 to 5As 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, and an effective sealing state is formed between the connector 8 and the shell 1, a control board 2 is provided in the shell 1, the control board 2 is connected to one end of the sintered terminal 5, and 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.

[0059] 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 begins 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 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 and micro-water detector needs to be used for dew point calibration before leaving the factory. During the dew point calibration process, the sulfur hexafluoride density and 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. At the same time, the microcontroller 201 calculates the humidity and sulfur hexafluoride gas concentration (usually expressed in ppm) based on the monitored pressure, temperature, and dew point values ​​according to a preset algorithm formula, where the formula is:

[0060] e(equilibrium vapor pressure) = pow(10.0,10.286-1779.7378 / (draw_temp(dew point)+273.15-35.85))

[0061] E(saturated water vapor pressure) = pow(10.0f,(10.286*(TEMP(temperature)+273.15)-2148.4909) / ((TEMP(temperature)+273.15)-35.85))

[0062] RH (humidity) = e*100 / E

[0063] ppm (water content) = 1000000.0*e / (PRESS (pressure)*1000.0-e), where pow(x,y) is x raised to the power of y.

[0064] Preferably, Figures 1-2As shown, a 4-core aviation plug 3 is bonded to the inner side of the aviation socket, and the 4-core aviation plug 3 is electrically connected to the control board 2 .

[0065] 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.

[0066] The aviation socket is an interface on the sensor housing 1 for fixing the aviation plug. It 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.

[0067] Once the 4-core aerial connector 3 is electrically connected to the control board 2, the sensor can transmit data through the 4-core aerial connector 3. The wires in the 4-core aerial connector 3 are used to transmit sensor-monitored parameters such as pressure, temperature, dew point, ppm, and humidity of the sulfur hexafluoride equipment. This data is transmitted to the backend data center via the 4-core aerial connector 3.

[0068] The 4-core aviation plug 3 can also be used to transmit power signals to realize external power supply for the sensor.

[0069] 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.

[0070] Preferably, Figures 2-4 As shown, an annular groove 9 is provided at one end of the housing 1 where the connector 8 is fixedly connected, and corresponding screw holes 10 are provided at corresponding positions of the connector 8. The housing 1 and the connector 8 are fixed by locking screws.

[0071] 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.

[0072] An annular groove 9 is defined at the end of the housing 1 where the connector 8 is to be securely connected. This groove 9 is annular, extending around the circumference of the housing 1, providing a stable support surface for the connector 8. It primarily mates with screw holes 10 in the connector 8, securing the two together via the tightening screws. This design not only enhances the stability of the connection but also facilitates removal and replacement of the connector 8.

[0073] During installation, the locking screw is threaded into the screw hole 10 of the connector 8 and passed through the annular groove 9 of the housing 1. It is then tightened until the screw fits snugly against the housing 1, forming a secure connection. The locking screw securely fastens the housing 1 and connector 8 together, preventing relative movement or loosening. This connection not only provides high strength and stability, but is also able to withstand certain vibrations and shocks.

[0074] 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 connection method that is both stable and detachable, and is suitable for various application scenarios that require high stability and reliability.

[0075] 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.

[0076] The control board 2 is a system that integrates 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 each other to achieve data transmission and control, and together constitute the core functions of the control board 2.

[0077] 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 .

[0078] 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; its output end is connected to the communication module 202 to send control instructions and data.

[0079] 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.

[0080] The output of signal acquisition module 205 is connected to the input of microcontroller 201. Furthermore, it is electrically connected to temperature sensor 601, pressure sensor 602, and capacitance humidity sensor 603, which are used to monitor the real-time operating status of the SF6 equipment. This module is applicable to various SF6 gas-insulated equipment, such as GIS, transformers, and mutual inductors.

[0081] 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.

[0082] 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;

[0083] The output end of the power supply 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 required voltage and current.

[0084] The storage module 204 is used to store information such as data, control algorithms, and configuration parameters generated by the control board 2 during operation.

[0085] The storage module 204 and the microcontroller 201 are electrically connected to implement data reading and writing operations. The microcontroller 201 can store processed data or configuration parameters in the storage module 204 for subsequent use or analysis.

[0086] Signal acquisition module 205 is electrically connected to temperature sensor 601, pressure sensor 602, and capacitive humidity sensor 603. These sensors are responsible for collecting real-time operating parameters of the sulfur hexafluoride equipment, converting the collected data into electrical signals and transmitting them to signal acquisition module 205. Signal acquisition module 205 then converts these electrical signals into digital signals that can be recognized by microcontroller 201 for processing and analysis.

[0087] The workflow of control panel 2:

[0088] The power module 203 provides a stable power supply to the control board 2 .

[0089] The signal acquisition module 205 collects data from sensors in real time and converts the data into electrical signals that can be recognized by the microcontroller 201 .

[0090] The microcontroller 201 receives data from the signal acquisition module 205 , executes a preset control algorithm, and generates control instructions according to the algorithm results.

[0091] The communication module 202 transmits the control instructions generated by the microcontroller 201 to external devices to achieve data communication and exchange.

[0092] The storage module 204 is used to store various data and information generated during the operation of the control board 2 for subsequent use or analysis.

[0093] In summary, the control panel 2 is a system that integrates multiple functional modules, and realizes real-time monitoring and control of environmental parameters such as temperature, pressure, and humidity through the collaborative work between the modules.

[0094] Preferably, Figure 2 As shown, a connector 4 is further provided on the control board 2 , and 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 connector 4 .

[0095] The arrangement of the connector 4 on the control board 2 is crucial for ensuring a stable connection with components such as the sintered terminal 5 and achieving 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 equipment.

[0096] like Figure 2 As shown, the connector 4 is a carefully 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.

[0097] In this embodiment, since the sintered terminal 5 is already welded to the control board 2, the connector 4 may be crimped to the sintered terminal 5. To ensure a tight seal between the connector 8 and the housing, the connector 4 includes a sealing groove structure that can accommodate a sealing material such as a sealing ring or sealant, thereby effectively preventing external air from entering the connection area.

[0098] Providing a sealing ring between the connector 4 and the housing is crucial for achieving a tight seal. Sealing rings are typically made of elastic materials such as rubber or silicone. These materials provide excellent sealing performance and adapt to varying temperature and pressure conditions. During installation, ensure that the sealing ring is correctly positioned, tightly fitted, and free of damage or deformation.

[0099] Because the sensor's monitoring circuit board 6 is located at the junction between connector 8 and the sulfur hexafluoride equipment, it comes into direct contact with the equipment's gases, placing extremely high demands on its sealing. Sulfur hexafluoride is a colorless, odorless, and non-toxic gas, but it decomposes into toxic and hazardous substances when in contact with air. Therefore, any leakage from the sensor would not only affect the accuracy of its monitoring results but also cause a drop in the sulfur hexafluoride gas pressure inside the equipment, reducing insulation performance. This reduced insulation performance could potentially lead to equipment failure, arcing, and even fire.

[0100] In summary, the placement of connector 4 on control board 2 is crucial for ensuring a stable connection with components such as sintered terminal 5 and for achieving a tight seal between connector 8 and the housing. In the specific application environment of this sensor, special attention must be paid to the design and testing of tight seals to ensure safe and reliable operation of the system.

[0101] 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 opened on the protective cover 7.

[0102] As can be seen from the figure, 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.

[0103] The protective cover 7 is designed as a hollow structure, and the other end of the hollow structure is set to 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 from external objects. This design not only reduces the weight of the protective cover 7, but also allows sulfur hexafluoride gas to flow, without affecting 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.

[0104] Monitoring circuit board 6 is inserted into the sulfur hexafluoride equipment to monitor gas. It requires full contact with the gas within the equipment to accurately detect gas parameters such as pressure, temperature, and dew point. The through-holes in protective cover 7 allow the sulfur hexafluoride gas within the equipment to flow smoothly into the protective cover 7 and come into contact with the sensors and other components on monitoring circuit board 6, ensuring that monitoring circuit board 6 can accurately monitor the gas status in real time.

[0105] Preferably, the external thread of the connector 8 is set to G1 / 2, and a groove for arranging a PTFE pad is provided on one side of the external thread of the connector 8.

[0106] The external thread of the connector 8 is set to G1 / 2, and a groove for setting a PTFE 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.

[0107] 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.

[0108] A groove and a PTFE gasket are placed in one side of the external threads of connector 8 to further enhance the sealing of the connection. PTFE gaskets are a commonly used sealing material with excellent corrosion resistance, high temperature resistance, and wear resistance. When connector 8 is connected to a pipe or interface, the PTFE gasket is compressed and fills the gap between the threads, forming a tight seal.

[0109] The addition of a PTFE gasket significantly reduces leakage paths between threads, thereby improving the sealing of the connection. This is particularly important for equipment requiring high airtightness. The compression deformation of the PTFE gasket absorbs minor errors during the connection process, thereby enhancing the stability and reliability of the connection. The corrosion and wear resistance of the PTFE gasket ensure that the connector 8 maintains good sealing performance during long-term use, extending its service life.

[0110] The connector 8 with G1 / 2 external thread and PTFE gasket plays an important role. Its good sealing performance is the key to ensure the safe and stable operation of the system.

[0111] 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.

[0112] The cable consists of two signal lines and two power lines. These two types of lines each have different functions in the cable:

[0113] Signal lines are used to transmit communication signals or data between devices. They transmit digital or analog signals between devices.

[0114] Power cord: Used to provide power to ensure the normal operation of the device. It usually has a large current carrying capacity to meet the power supply needs of the device. It transmits electrical energy from the power supply device to the powered device.

[0115] The four pins of the 4-core aviation plug 3 are connected to the two signal wires and two power wires in the cable respectively. This connection ensures the reliability of power supply and signal transmission between devices.

[0116] In summary, the 4-core aerial 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. This design has the advantages of high reliability, easy maintenance and flexibility.

[0117] Preferably, the temperature sensor 601 is a thin film platinum resistor pt1000;

[0118] The pressure sensor 602 is a waterproof air pressure sensor WF5803F;

[0119] The capacitive humidity sensor 603 is a capacitive humidity sensor K5-W.

[0120] The temperature sensor 601 uses a thin film platinum resistor PT1000;

[0121] The PT1000 thin film platinum resistor is a platinum-based thermal resistor whose resistance changes with temperature. This change is linear, meaning the resistance is directly proportional to the temperature.

[0122] At 0°C, the resistance of PT1000 is 1000 ohms, which makes it highly recognizable.

[0123] As the temperature rises, the resistance of PT1000 increases linearly. This characteristic makes it highly accurate in temperature measurement.

[0124] Thin film platinum resistors have excellent measurement accuracy, good stability and reliability.

[0125] Due to its high precision and stability, it is also often used in situations where precise temperature control is required.

[0126] The pressure sensor 602 uses the waterproof air pressure sensor WF5803F;

[0127] The WF5803F waterproof air pressure sensor is based on the Wheatstone bridge principle. It uses diffused resistors on a single-crystal silicon wafer to detect small changes in resistance value and converts them into air pressure signals.

[0128] Its measuring range is 100kPa, relative accuracy is ±0.3kPa, and resolution is as high as 0.001kPa. These parameters make WF5803F have high precision and high resolution in air pressure measurement.

[0129] The operating temperature range is -40 to 85°C, with a temperature accuracy of ±1°C. It is suitable for air pressure measurement in various ambient temperatures.

[0130] It uses a stainless steel ring surface and substrate packaging, complies with RoHS standards, and has good waterproof performance.

[0131] Suitable for other occasions that require accurate measurement of air pressure.

[0132] Capacitive humidity sensor 603 uses capacitive humidity sensor K5-W;

[0133] The K5-W capacitive humidity sensor's sensitive element is a humidity-sensitive capacitor, primarily made of polymers or metal oxides. These materials have a strong adsorption capacity for water molecules, and the amount of water adsorbed varies with ambient humidity. Because water molecules have a large electric dipole moment, the material's permittivity changes after absorbing water, thereby altering the capacitor's capacitance. By measuring this change in capacitance, the ambient humidity can be inferred.

[0134] This device is commonly used in applications requiring precise humidity measurement. The dew point value in monitoring circuit board 6 is monitored using a capacitive humidity sensor 603. Changes in dew point correspond to relative changes in capacitance. To ensure the accuracy of capacitive humidity sensor 603's measurement, it is calibrated using a sulfur hexafluoride (SF6) density and water content detector before shipment. During this calibration process, the sulfur hexafluoride (SF6) density and water content detector is used to provide an environment with a known dew point. By placing capacitive humidity sensor 603 in this environment and measuring changes in its capacitance, the sensor's dew point can be calibrated, ensuring its reliability and accuracy in practical applications.

[0135] The sulfur hexafluoride density micro-water sensor control method performs the following steps:

[0136] (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;

[0137] (2) Data processing and conversion: The microcontroller 201 receives data from the signal acquisition module 205, processes the data and converts the humidity and sulfur hexafluoride gas concentration values ​​according to a preset algorithm formula;

[0138] (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.

[0139] After installing the sulfur hexafluoride density micro-water sensor on the sulfur hexafluoride equipment test column, connect the test column to the sulfur hexafluoride gas source to ensure 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.

[0140] The performance of this sensor was tested, and the test data is shown in Table 1:

[0141]

[0142] As can be seen from Table 1, the sensor has high test accuracy and can meet the requirements of the site. It 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.

[0143] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention. These changes involve related technologies well known to those skilled in the art, and all fall within the scope of protection of the patent of this invention.

[0144] Many other changes and modifications can be made without departing from the spirit 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), and an effective sealing state is formed between the connector (8) and the shell (1), a control board (2) is provided 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 provided on the outside of the monitoring circuit board (6), the protective cover (7) is provided with a hollow structure, one end of which is threadedly connected to the connector (8), and the other end is provided with an opening, and a plurality of through holes are provided on the protective cover (7); A 4-core aviation plug (3) is bonded to the inner side of the aviation socket, and the 4-core aviation plug (3) is electrically connected to the control board (2). The 4-core aviation plug (3) is connected to the signal box on the device via a cable, and the cable includes 2 signal lines and 2 power lines. An annular groove (9) is provided at one end of the housing (1) fixedly connected to the connector (8), and corresponding screw holes (10) are provided at corresponding positions of the connector (8). The housing (1) and the connector (8) are fixed by locking screws; the control board (2) includes a microcontroller (201), a signal acquisition module (205), and 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); the signal acquisition module (205) is electrically connected to the temperature sensor (601), the pressure sensor (602), and the capacitance humidity sensor (603); the control board (2) is further provided with a connector (4); the control board (2) is welded to the sintered terminal (5); and a sealing ring is provided between the sintered terminal (5) and the connector (4).

2. The sulfur hexafluoride density micro-water sensor according to claim 1, characterized in that: The external thread of the connector (8) is set to G1 / 2, and a groove for arranging a PTFE pad is provided on one side of the external thread of the connector (8).

3. The sulfur hexafluoride density micro-water sensor according to claim 2, 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.

4. Sulfur hexafluoride density micro-water sensor control method, characterized in that, Using the sulfur hexafluoride density micro-water sensor according to any one of claims 1 to 3, perform the following steps: (1) Connection and initialization: Connect 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), processes the data according to a preset algorithm formula, and converts the data into 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).

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