A SF6 gas relay density monitoring device

Abstract

The utility model provides a kind of SF6 gas relay density monitoring device, it is related to SF6 gas density monitoring technical field.The device includes shell, gas flow channel and control unit.Gas flow channel is through shell, and its inner wall is equipped with the mounting pedestal that is protruded to center.Fixed with sensor module on mounting pedestal, the module includes temperature sensor and pressure sensor, and module surface is covered with high heat-conducting silicone grease layer, to improve heat conduction efficiency.The air current direction of sensor module is equipped with spoiler, it is inclined arc sheet, can optimize air current state.Control unit is electrically connected with sensor module, for receiving and processing the signal from temperature sensor and pressure sensor, the device solves the technical problem that SF6 gas relay density monitoring device is insufficient in real-time and accuracy due to temperature compensation, and the real-time of temperature compensation and measurement accuracy are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of SF6 gas density monitoring technology, and more specifically, to an SF6 gas relay density monitoring device. Background Technology

[0002] With the increasing demand for high reliability in smart grids and high-voltage electrical equipment, SF6 gas, due to its excellent insulation and arc-extinguishing properties, is widely used in GIS (Gas Insulated Switchgear) and circuit breakers. Density relays, as the core component of SF6 gas condition monitoring, directly affect the safe operation of equipment due to their measurement accuracy. However, existing digital density relays, under complex temperature-changing conditions, suffer from density conversion errors due to temperature compensation lag, easily leading to false alarms or monitoring failures, thus hindering the improvement of high-voltage equipment condition sensing capabilities.

[0003] Traditional solutions primarily mitigate the effects of temperature by using separate temperature sensors (such as external probes) combined with electronic compensation algorithms. However, these sensors are typically located far from the gas flow path, resulting in long heat conduction paths that are susceptible to environmental interference, leading to response delays (>5 seconds) and steady-state errors (above ±1℃). Furthermore, mechanical compensation structures (such as bimetallic strips) suffer from nonlinear errors and aging drift issues, while pure algorithm optimization is limited by sensor data lag, making it difficult to achieve real-time and accurate compensation under dynamic operating conditions.

[0004] In summary, the technical problem of density monitoring deviation caused by insufficient real-time performance and accuracy of temperature compensation in SF6 gas relay density monitoring devices is an urgent issue that needs to be addressed. Utility Model Content

[0005] The main objective of this invention is to provide an SF6 gas relay density monitoring device, which at least solves the technical problem of density monitoring deviation caused by insufficient real-time performance and accuracy of temperature compensation in SF6 gas relay density monitoring devices. It significantly improves the real-time performance and measurement accuracy of temperature compensation, while reducing maintenance complexity and effectively solving the density monitoring deviation problem caused by the lag in temperature response of traditional equipment.

[0006] To achieve the above objectives, this utility model provides an SF6 gas relay density monitoring device. The device includes: a housing, a gas flow channel, and a control unit. The gas flow channel is a pipe penetrating the housing, and the inner wall of the gas flow channel is provided with a mounting base protruding towards the center. A sensor module is fixed on the mounting base. The sensor module includes a temperature sensor and a pressure sensor, and the surface of the sensor module is covered with a layer of highly thermally conductive silicone grease. A baffle is provided in the direction of airflow of the sensor module. The baffle is an arc-shaped thin sheet inclined at 30°-60°. The control unit is electrically connected to the sensor module and is used to receive and process temperature and pressure signals.

[0007] Specifically, the surface of the spoiler is provided with serrated protrusions, the spacing of which is 5-10mm and the height is 1-2mm.

[0008] Specifically, the protrusion height of the mounting base is 1 / 3 to 1 / 2 of the inner diameter of the gas flow channel.

[0009] Specifically, the mounting base is fixedly connected to the inner wall of the gas flow channel by a thermally conductive solder, which is a silver-based solder.

[0010] Specifically, the control unit is connected to a temperature sensor to dynamically generate a density compensation value, and the density compensation value is displayed in real time on a display screen.

[0011] Specifically, the thickness of the high thermal conductivity silicone grease layer is 0.5-1mm, and the thermal conductivity of the high thermal conductivity silicone grease layer is ≥5W / m·K.

[0012] This invention provides an SF6 gas relay density monitoring device, which includes a housing, a gas flow channel, and a control unit. The gas flow channel extends through the housing, and its inner wall protrudes towards the center to form a mounting base. A sensor module is fixed on the mounting base. This module integrates a temperature sensor and a pressure sensor, enabling real-time sensing of gas temperature and pressure changes. The surface of the sensor module is covered with a layer of highly thermally conductive silicone grease to improve thermal conductivity. An arc-shaped thin-film baffle, tilted at 30°-60°, is provided in the direction of the airflow from the sensor module to optimize airflow. The control unit is electrically connected to the sensor module and is responsible for receiving and processing temperature and pressure signals from the sensors. This device solves the technical problem of density monitoring deviation caused by insufficient real-time performance and accuracy of temperature compensation in SF6 gas relay density monitoring devices, significantly improving the real-time performance and measurement accuracy of temperature compensation. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0014] Figure 1 This is a longitudinal cross-sectional schematic diagram of an optional SF6 gas relay density monitoring device according to an embodiment of the present invention;

[0015] 20. Housing; 30. Gas flow channel; 40. Control unit; 13. Mounting base; 10. Sensor module; 11. Temperature sensor; 12. Pressure sensor; 14. High thermal conductivity silicone grease layer; 15. Baffle; 151. Serrated protrusion; 16. Thermally conductive solder. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] According to the embodiments of this utility model, the GIS air chamber SF6 micro-water density monitoring sensor, such as Figure 1As shown, this utility model provides an SF6 gas relay density monitoring device. The device includes: a housing 20, a gas flow channel 30, and a control unit 40. The gas flow channel 30 is a pipe that penetrates the housing 20, and the inner wall of the gas flow channel 30 is provided with a mounting base 13 protruding towards the center. A sensor module 10 is fixed on the mounting base 13. The sensor module 10 includes a temperature sensor 11 and a pressure sensor 12. The surface of the sensor module 10 is covered with a high thermal conductivity silicone grease layer 14. A baffle 15 is provided in the airflow direction of the sensor module 10. The baffle 15 is an arc-shaped thin sheet inclined at 30°-60°. The control unit 40 is electrically connected to the sensor module 10 and is used to receive and process temperature and pressure signals.Specifically, an embodiment of this utility model discloses an SF6 gas relay density monitoring device. The device includes a housing 20, a gas flow channel 30, and a control unit 40. The gas flow channel 30 is a cylindrical pipe penetrating the housing 20 and has flange interfaces at both ends for connecting to external SF6 gas pipes. An annular mounting base 13 protruding towards the center is fixed to the inner wall of the gas flow channel 30 by welding. A sensor module 10 is fixed to the top plane of the mounting base 13 by threaded connection. The sensor module 10 includes a patch temperature sensor 11 and a piezoresistive pressure sensor 12. The metal detection surfaces of the sensors 10 are all covered with a 0.5mm thick layer of high thermal conductivity silicone grease 14 to accelerate heat conduction. A baffle 15 is bolted to the front of the sensor module 10. The baffle 15 is a 1mm thick 304 stainless steel sheet in the shape of a 45° inclined arc, with its concave surface facing the air inlet of the gas flow channel 30 to uniformly disperse the airflow and eliminate turbulence. The control unit 40 is soldered to the pins of the sensor module 10 via high-temperature resistant wires. The control unit 40 contains an STM32F103 microcontroller, which acquires the resistance of the temperature sensor 11 at 100ms intervals via the I2C bus. The voltage signal from the pressure sensor 12 and the pressure signal are used to perform real-time temperature compensation for the pressure value using a linear regression algorithm. The SF6 gas density value is calculated according to the ideal gas law, and the density data is output to an external monitoring system via an RS485 interface. The side of the housing 20 has an IP67-rated junction box, inside which a shielded twisted-pair cable connects the control unit 40 to an external power supply. A self-regulating heating tape is wrapped around the outer wall of the gas flow channel 30. A PID control algorithm maintains the temperature inside the gas flow channel 30 consistent with the SF6 gas ambient temperature. A 2mm diameter guide hole is provided at the bottom of the mounting base 13. To balance the pressure difference across the sensor module 10, a high thermal conductivity silicone grease layer 14 is uniformly applied to the metal surface of the sensor module 10 using a scraping process. Its thermal conductivity is 3.0 W / m·K. The control unit 40's circuit board integrates an AD7793 analog-to-digital converter chip, converting the sensor's analog signal into a 24-bit digital signal. The linear regression algorithm uses a compensation coefficient matrix stored in the microcontroller's FLASH memory to perform least-squares fitting on historical temperature-pressure data, establishing a temperature compensation model for the pressure measurement. The ideal gas equation of state adopts the Clapeyron equation form, and the compressibility factor parameters of SF6 gas are obtained through a lookup table. This device solves the technical problem of density monitoring deviation caused by insufficient real-time performance and accuracy of temperature compensation in SF6 gas relay density monitoring devices, significantly improving the real-time performance and measurement accuracy of temperature compensation.

[0018] The following are preferred embodiments:

[0019] Specifically, the surface of the spoiler 15 is provided with serrated protrusions 151, the spacing of the serrated protrusions 151 is 5-10mm, and the height is 1-2mm.

[0020] Specifically, the protrusion height of the mounting base 13 is 1 / 3 to 1 / 2 of the inner diameter of the gas flow channel 30.

[0021] Specifically, the mounting base 13 is fixedly connected to the inner wall of the gas flow channel 30 by a thermally conductive solder 16, which is a silver-based solder.

[0022] Specifically, the control unit 40 is connected to the temperature sensor 11 to dynamically generate a density compensation value, and the density compensation value is displayed in real time on the display screen.

[0023] Specifically, the thickness of the high thermal conductivity silicone grease layer 14 is 0.5-1 mm, and the thermal conductivity of the high thermal conductivity silicone grease layer 14 is ≥5 W / m·K.

[0024] In a preferred embodiment, this utility model discloses an SF6 gas relay density monitoring device. The device includes a housing 20, a gas flow channel 30, and a control unit 40. The gas flow channel 30 is a 316L stainless steel pipe with an inner diameter of 30mm and is connected to an external SF6 gas pipeline via flange bolts. An annular mounting base 13, protruding towards the center of the pipe, is welded and fixed to the inner wall of the gas flow channel 30 using silver-based solder 16. The silver-based solder 16 has the composition Ag95Cu5 and a melting point of 200℃. The radial protrusion of the mounting base 13... The mounting base 13 has a height of 10-15mm and is 1 / 3-1 / 2 of the inner diameter of the gas flow channel 30. The top surface of the mounting base 13 is machined with an M4 threaded hole, and the sensor module 10 is mounted using threaded fasteners. The sensor module 10 includes an SHT31 digital temperature sensor 11 and an MPX5100DP piezoresistive pressure sensor 12. The metal detection surfaces of the temperature sensor 11 and pressure sensor 12 are coated with a 0.8mm thick high thermal conductivity silicone grease layer 14 using a scraping process. The high thermal conductivity silicone grease layer 14 has a thermal conductivity of 6.2W / m·K and is temperature resistant. The temperature range is -40℃ to 200℃. The sensor module 10 is fixedly mounted with a spoiler 15 in the direction of the airflow using M3 stainless steel bolts. The spoiler 15 is a 1.2mm thick 304 stainless steel sheet in an arc shape with a 50° inclination. The airflow contact surface of the spoiler 15 has equilateral triangular sawtooth protrusions 151 stamped with a spacing of 8mm and a height of 1.5mm. The arrangement of the sawtooth protrusions 151 forms a 30° angle with the airflow direction to generate micro-vortices. The control unit 40 is connected to the sensor module 10 via AWG24 silicone wires. The pins of sensor 11 and pressure sensor 12 are soldered together. The control unit 40 is internally configured with an STM32F407 microcontroller and acquires the 16-bit digital signal from temperature sensor 11 and the analog signal from pressure sensor 12 at 50ms intervals via an I2C bus. The microcontroller incorporates a linear regression algorithm to compensate for the temperature-pressure data, calculates the SF6 gas density value according to the Clapeyron equation, and drives a 2.4-inch TFT LCD screen via an SPI interface to display the density compensation value in real time. The LCD screen has a refresh rate of 60Hz and an adjustable brightness range of 150-500 cd / m². 2 The silver-based solder 16 has a weld width of 2mm and is continuously welded along the circumference of the mounting base 13. The weld is free of porosity defects and has passed X-ray flaw detection. The top of the serrated protrusion 151 has a rounded corner R0.3mm to prevent airflow stripping. The thermal resistance between the high thermal conductivity silicone grease layer 14 and the sensor metal surface is ≤0.05℃·cm. 2 / W, the bottom of the mounting base 13 has a 2mm diameter guide hole so that the pressure difference on both sides of the sensor module 10 is ≤1.2Pa. The circuit board of the control unit 40 integrates an AD7795 analog-to-digital converter chip to convert the 0-5V analog signal of the pressure sensor 12 into a 24-bit digital quantity. The linear regression algorithm corrects the temperature drift through the compensation coefficient matrix stored in the microcontroller FLASH. The pressure measurement error after compensation is ≤±0.05%FS. The data displayed on the TFT LCD screen includes real-time density value, temperature compensation value and original pressure value, and the data update delay is ≤200ms.

[0025] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An SF6 gas relay density monitoring device, comprising a housing (20), a gas flow channel (30), and a control unit (40), characterized in that: The gas flow channel (30) is a pipe that penetrates the outer shell (20), and the inner wall of the gas flow channel (30) is provided with a mounting base (13) that protrudes towards the center; A sensor module (10) is fixed on the mounting base (13). The sensor module (10) includes a temperature sensor (11) and a pressure sensor (12). The surface of the sensor module (10) is covered with a high thermal conductivity silicone grease layer (14). The sensor module (10) is provided with a spoiler (15) in the direction of the airflow, and the spoiler (15) is an arc-shaped thin sheet inclined at 30°-60°; The control unit (40) is electrically connected to the sensor module (10), and the control unit (40) is used to receive and process temperature and pressure signals.

2. The SF6 gas relay density monitoring device according to claim 1, characterized by: The surface of the spoiler (15) is provided with serrated protrusions (151), the spacing of the serrated protrusions (151) is 5-10mm, and the height is 1-2mm.

3. The SF6 gas relay density monitoring device according to claim 1, characterized by: The protrusion height of the mounting base (13) is 1 / 3 to 1 / 2 of the inner diameter of the gas flow channel (30).

4. The SF6 gas relay density monitoring device according to claim 1, characterized by: The mounting base (13) is fixedly connected to the inner wall of the gas flow channel (30) by a thermally conductive solder (16), which is a silver-based solder.

5. The SF6 gas relay density monitoring device according to claim 1, characterized by: The control unit (40) is connected to the temperature sensor (11) to dynamically generate a density compensation value, and displays the density compensation value in real time on the display screen.

6. The SF6 gas relay density monitoring device according to claim 1, characterized by: The thickness of the high thermal conductivity silicone grease layer (14) is 0.5-1 mm, and the thermal conductivity of the high thermal conductivity silicone grease layer (14) is ≥5 W / m·K.

Images