GIS online micro water density monitoring system

Abstract

The application provides a GIS online micro-water density monitoring system, and belongs to the technical field of micro-water density detection.The system comprises a processing cylinder, a monitoring host, GIS equipment and a transmitter main body; the GIS equipment is communicated with the inner cavity of the processing cylinder through a gas inlet pipe and a gas outlet pipe; the system further comprises a uniform flow dehumidification assembly arranged in the processing cylinder, a cleaning assembly arranged on the top of the uniform flow dehumidification assembly and a vibration assembly arranged on the uniform flow dehumidification assembly; the gas flow is compressed, accelerated and cooled through a gas collecting cover; the gas flow is further cooled and uniformly mixed by a spiral blade, so that the detection precision is improved; water droplets are removed by gravity and their sliding paths are constrained; a wiping mechanism is driven to rotate and lift by a fan blade power, so that online cleaning of the sensor and self-cleaning of the wiping block are realized; meanwhile, the axial movement of a sliding rod is driven by a cam groove and a roller, so that the spiral blade is excited to vibrate at a high frequency to remove condensed water droplets; and the accuracy and long-term stability of micro-water density monitoring are improved, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of micro-moisture density detection technology, and more specifically, to a GIS online micro-moisture density monitoring system. Background Technology

[0002] Gas-insulated gas-insulated switchgear (GIS) equipment is widely used in power systems due to its compact structure, reliable operation, and low maintenance. GIS equipment is filled with SF6 gas as an insulating and arc-quenching medium. The moisture content and density of SF6 gas are key indicators for evaluating the insulation performance of GIS equipment. Excessive moisture content causes SF6 gas to decompose under the influence of an electric arc, generating low-fluorine compounds (such as SOF2 and SO2F2), which then react with water to form hydrofluoric acid, sulfuryl fluoride, and elemental sulfur particles, severely corroding internal components and reducing insulation strength. Conversely, a decrease in density directly weakens the gas's arc-quenching and insulating capabilities, potentially leading to major safety accidents. Therefore, online monitoring of the moisture density of SF6 gas in GIS equipment is of great significance.

[0003] Currently, GIS online micro-moisture density monitoring systems generally adopt a transmitter direct measurement scheme, which involves directly installing a transmitter integrating pressure, temperature, and humidity sensors onto the gas chamber or pipeline of the GIS equipment, collecting gas parameters in real time, and transmitting them to the monitoring host via RS-485 or other buses. However, this technical solution has the following technical drawbacks in practical applications: First, the sensor probe is easily contaminated, and the measurement accuracy decreases over time. After long-term operation of the GIS equipment, the low-fluorine compounds generated by SF6 gas under partial discharge or arcing react with water to form sulfur elemental solid particles and acidic droplets. These contaminants adhere to the surface of the sensor probe, causing the sensor's response characteristics to drift, the measurement error to gradually increase, and in severe cases, the sensor to fail. In existing technologies, cleaning the sensor probe requires power outage, evacuation of SF6 gas, and disassembly of the transmitter, which is cumbersome and poses safety hazards, and cannot achieve online automatic cleaning. Secondly, existing systems only passively measure the trace moisture content in the gas and cannot pre-treat the gas entering the sensor to reduce its humidity. When the inside of the GIS equipment is severely damp, the high-humidity gas directly contacts the sensor probe, which not only accelerates probe contamination but also causes the sensor to output a saturation value in a short time, failing to accurately reflect the trace moisture state inside the equipment.

[0004] How to invent an online GIS micro-water density monitoring system to solve these problems has become an urgent issue for those skilled in the art. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a GIS online micro-water density monitoring system, which aims to solve the problems mentioned in the background.

[0006] This invention is implemented as follows: This invention provides an online micro-moisture density monitoring system for GIS, comprising a processing cylinder, a monitoring host, a GIS device, and a transmitter body, at least part of which extends into the processing cylinder and is sealed to the processing cylinder. The GIS device is provided with an exhaust pipe communicating with the top of its chamber and an air inlet pipe communicating with the bottom of its chamber. The chamber of the GIS device is connected to the inner cavity of the processing cylinder through the air inlet pipe and the exhaust pipe. The system also includes: A uniform flow dehumidification component is disposed inside the processing cylinder to guide gas flow and remove moisture from the gas; A cleaning component is disposed on top of the uniform flow dehumidification component and is used to clean the sensing module of the transmitter body. A vibration component, which is disposed on the uniform flow dehumidification component, is used to remove condensed water droplets to maintain dehumidification efficiency.

[0007] Preferably, the transmitter body is fixedly installed on the top of the processing cylinder, and a base is provided at the lower end of the transmitter body. The base integrates a sensor assembly and a signal processing assembly. The base is sealed to the processing cylinder, and the sensor assembly is located at the top of the inner cavity of the processing cylinder for collecting pressure signals, temperature signals and humidity signals inside the processing cylinder. The signal processing component is communicatively connected to the sensor component. The signal processing component obtains pressure, temperature and humidity values ​​based on the signals collected by the sensor component. Based on the pressure and temperature values, it calculates the gas density under standard conditions at 20°C through temperature compensation. Based on the pressure and humidity values, it calculates the ratio of water vapor partial pressure to SF6 gas partial pressure to obtain the trace water content in ppm by volume ratio.

[0008] Preferably, the transmitter body is communicatively connected to the monitoring host, and the digital signal output by the signal processing component is uploaded to the monitoring host via RS-485 bus or CAN bus and in accordance with IEC 61850 protocol or Modbus protocol.

[0009] Preferably, the uniform flow dehumidification assembly includes a spiral blade, a motor, and a gas collection hood arranged sequentially from top to bottom. The motor is fixed inside the processing cylinder by a bracket, and a fan blade is fixedly connected to the output end of the motor. The spiral blade is fixed in the upper part of the inner cavity of the processing cylinder, with the top end of the spiral blade close to the sensing module of the transmitter body, and the lower end of the spiral blade located above the gas collection hood. An upper cylinder and a lower cylinder are fixedly connected inside the spiral blade, and the lower end of the lower cylinder is threadedly connected to the gas collection hood.

[0010] Preferably, the gas collecting hood is composed of a first hood and a second hood, which are then fixed together with bolts. Both the first hood and the second hood are provided with air outlet grooves. The openings of the air outlet grooves are offset from the lower end of the spiral blades in the circumferential direction. The gas collecting hood has an umbrella-shaped structure that gradually converges from bottom to top, which is used to gather and guide the airflow to the air outlet grooves. The end of the fan blades is located inside the bottom of the gas collecting hood, so that the liquid dripping from the spiral blades is guided to fall along the outer wall of the gas collecting hood, thereby preventing the liquid from entering the interior of the gas collecting hood through the air outlet grooves. The spiral blades are made of thermally conductive material, which is used to cool the airflow impacting its surface, so that the water vapor in the airflow condenses on the surface of the spiral blades.

[0011] Preferably, the cleaning assembly includes a drive shaft, a reduction mechanism, and a scraper. The end of the drive shaft is fixedly connected to the center of the fan blade. The drive shaft is rotatably engaged between the air collection hood, the upper cylinder, and the lower cylinder, and its top end extends to the upper side of the upper cylinder. The reduction mechanism includes an internal gear ring fixedly mounted on the top of the upper cylinder, a sun gear rotatably mounted at the center of the internal gear ring, a plurality of planet gears meshing with the sun gear and the internal gear ring respectively, and a planet carrier for mounting each planet gear; the sun gear is fixedly connected to the top of the drive shaft, the top of the internal gear ring is fixedly connected to an isolation cover for limiting the movement of the planet gears and the planet carrier, the top of the planet carrier is fixedly connected to a pushing mechanism, the output end of the pushing mechanism is fixedly connected to a wiping mechanism, and the pushing mechanism is coaxially arranged with the transmitter body; the scraper is fixed on the upper side of the isolation cover.

[0012] Preferably, the pushing mechanism is an electric push rod or a pneumatic push rod; the bottom of the wiping mechanism is a rigid plate with elasticity, and the top is provided with a detachable wiping block; the wiping mechanism has a coverage area that can completely cover the sensing module of the transmitter body; When the pushing mechanism is in its initial state, the wiping mechanism is located below the scraper. When the wiping mechanism rotates, the wiping block at its top intermittently contacts the bottom of the scraper. After the pushing mechanism extends, the wiping block at the top of the wiping mechanism abuts against the bottom sensing module of the transmitter body. At this time, the wiping mechanism is located above the scraper and does not interfere with the scraper.

[0013] Preferably, the vibration assembly includes a cylindrical cam, a roller, a slide rod, and several limiting holes on the helical blades; the cylindrical cam is rotatably disposed between the upper and lower cylinders, the cylindrical cam is fixedly connected to the drive shaft, the cylindrical cam has a cam groove, and the roller is slidably embedded in the cam groove; the slide rod is slidably passed through the limiting holes on the helical blades; the slide rod has a mounting hole and a threaded portion, the mounting hole has a fixing bolt, and the fixing bolt is threadedly connected to the roller; When the cylindrical cam rotates, the sliding rod moves axially through the cooperation between the cam groove and the roller, and then the spiral blade vibrates through the friction between the edge of the threaded part and the edge of the limiting hole.

[0014] Preferably, the bottom of the inner cavity of the processing cylinder is provided with a liquid collection platform, and the liquid collection platform is provided with an inverted conical liquid guiding surface for collecting liquid.

[0015] Preferably, the lowest point of the liquid collection platform is connected to a drain pipe, the drain pipe extends outward through the wall of the processing cylinder, and a discharge valve is installed on the drain pipe.

[0016] The beneficial effects of this invention are: 1. This invention utilizes an umbrella-shaped gas collection hood that gradually converges from bottom to top, forming a narrow channel with a large inlet and a small outlet. The adiabatic expansion and cooling effect of the gas causes initial condensation of water vapor. The high-speed airflow from the outlet channel tangentially impacts a spiral blade made of heat-conducting material, further condensing and agglomerating water droplets on its surface. The spiral structure of the blade simultaneously divides, redirects, and mixes the airflow, eliminating uneven temperature and humidity distribution caused by gas chamber stratification. This ensures the representativeness of the gas entering the transmitter body, thereby improving the accuracy of micro-moisture content and density measurements. Simultaneously, the condensed water droplets slide down the spiral blade surface under gravity, are guided by the outer wall of the gas collection hood, and fall directly into the liquid collection platform at the bottom of the processing cylinder. The entire water droplet flow path completely avoids the motor location, effectively preventing the motor from getting damp, short-circuited, or corroded, ensuring the long-term safety and reliability of the motor.

[0017] 2. This invention utilizes the rotational power of fan blades to drive the wiping mechanism to rotate at low speed via a transmission shaft and planetary reduction mechanism. Combined with the lifting action of the push mechanism, the wiping block rubs against the sensor module to remove contaminants when cleaning is required. In the non-cleaning state, it intermittently contacts the fixed scraper to achieve self-cleaning of the wiping block. No power outage or disassembly is required, realizing fully automatic online maintenance of the sensor probe, significantly extending the manual maintenance cycle and reducing operation and maintenance costs.

[0018] 3. This invention converts the rotational motion of the drive shaft into the axial reciprocating motion of the slide rod through the cooperation of the cylindrical cam and the roller. Then, the intermittent friction between the edge of the threaded part of the slide rod and the edge of the limiting hole of the spiral blade excites the spiral blade to generate high-frequency micro-amplitude vibration. The vibration causes the condensate droplets attached to the surface of the spiral blade to fall off quickly, breaking the continuous water film and restoring the heat exchange efficiency between the spiral blade and the airflow. At the same time, the vibration also causes the condensate to flow down the spiral blade in a directional manner, preventing the water droplets from being entrained by the airflow again, and removing solid particles deposited on the blade, ensuring the long-term stable operation of the system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the transmitter body and the distribution structure of the processing cylinder of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the main structure of the transmitter of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the processing cylinder of the present invention; Figure 5 This is a schematic diagram of the axial movement range of the slide rod of the present invention; Figure 6 This is a schematic diagram of the mounting position structure of the cylindrical cam of the present invention; Figure 7 This is the invention Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the structure of the driving mechanism of the present invention during operation; Figure 9 This is the invention Figure 8 Enlarged structural diagram at point B; Figure 10 This is a schematic diagram of the gas collection hood and spiral blade structure of the present invention; Figure 11 This is a schematic diagram of a partial explosion structure of the present invention; Figure 12 This is the invention Figure 11 Enlarged structural diagram at point C.

[0021] In the diagram: 1. Transmitter body; 2. Processing cylinder; 3. Monitoring host; 4. GIS equipment; 5. Spiral blade; 6. Cylindrical cam; 7. Motor; 8. Gas collection hood; 9. Reduction mechanism; 11. Base; 12. Sensor assembly; 21. Inlet pipe; 22. Exhaust pipe; 23. Drain pipe; 24. Liquid collection platform; 50. Limiting hole; 51. Upper cylinder; 52. Lower cylinder; 61. Roller; 62. Slide rod; 71. Fan blade; 72. Drive shaft; 73. Bracket; 80. Gas outlet groove; 81. Cover body one; 82. Cover body two; 91. Internal gear ring; 92. Planetary gear; 93. Sun gear; 94. Planetary carrier; 95. Isolation cover; 96. Pushing mechanism; 97. Wiping mechanism; 98. Scraper; 231. Discharge valve; 611. Fixing bolt; 621. Threaded part. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, refer to Figures 1-12 A GIS online micro-moisture density monitoring system includes a processing cylinder 2, a monitoring host 3, a GIS device 4, and a transmitter body 1 that extends into the processing cylinder 2 and is sealed to the processing cylinder 2. The GIS device 4 is provided with an exhaust pipe 22 communicating with the top of its chamber and an air inlet pipe 21 communicating with the bottom of its chamber. The chamber of the GIS device 4 is connected to the inner cavity of the processing cylinder 2 through the air inlet pipe 21 and the exhaust pipe 22.

[0024] The system also includes: Uniform flow dehumidification component, which is set inside the treatment cylinder 2, is used to guide the gas flow and remove moisture from the gas; A cleaning component is located on top of the uniform flow dehumidification component and is used to clean the sensing module of the transmitter body 1. The vibration component is installed on the uniform flow dehumidification component to remove condensed water droplets in order to maintain dehumidification efficiency.

[0025] The transmitter body 1 is fixedly installed on the top of the processing cylinder 2. A base 11 is provided at the lower end of the transmitter body 1. The sensor assembly 12 and the signal processing assembly are integrated on the base 11. The base 11 is sealed to the processing cylinder 2. The sensor assembly 12 is located at the top of the inner cavity of the processing cylinder 2 and is used to collect pressure, temperature and humidity signals inside the processing cylinder 2. This arrangement places the sensor assembly 12 at the end of the airflow, avoiding direct impact of condensate or impurities on the sensing module. At the same time, the top position facilitates sealing and electrical connection, reducing the risk of gas leakage. The signal processing assembly is communicatively connected to the sensor assembly 12. The signal processing assembly obtains the pressure, temperature and humidity values ​​based on the signals collected by the sensor assembly 12. Based on the pressure and temperature values, it calculates the gas density under standard conditions at 20°C through temperature compensation. Based on the pressure and humidity values, it calculates the ratio of water vapor partial pressure to SF6 gas partial pressure to obtain the trace water content in ppm by volume.

[0026] Furthermore, the transmitter body 1 is communicatively connected to the monitoring host 3, and the digital signal output by the signal processing component is uploaded to the monitoring host 3 via RS-485 bus or CAN bus, and in accordance with IEC 61850 protocol or Modbus protocol.

[0027] The uniform flow dehumidification assembly includes a spiral blade 5, a motor 7, and a gas collection hood 8 arranged sequentially from top to bottom. The motor 7 is fixed inside the processing cylinder 2 by a bracket 73. A fan blade 71 is fixedly connected to the output end of the motor 7. The spiral blade 5 is fixed in the upper part of the inner cavity of the processing cylinder 2. The top of the spiral blade 5 is close to the sensing module of the transmitter body 1, and the lower end of the spiral blade 5 is located above the gas collection hood 8. An upper cylinder 51 and a lower cylinder 52 are fixedly connected inside the spiral blade 5. The lower end of the lower cylinder 52 is threadedly connected to the gas collection hood 8. The fan blade 71 rotates to generate negative pressure and actively draws gas from the GIS equipment 4. At the same time, the end position of the fan blade 71 ensures that the condensate dripping from the spiral blade 5 is guided by the outer wall of the gas collection hood 8 and will not enter the interior of the gas collection hood 8 through the gas outlet groove 80, thus avoiding liquid entrainment.

[0028] The gas collecting hood 8 is assembled from two hood bodies 81 and 82 and fixed with bolts. Both hood bodies 81 and 82 have air outlet grooves 80. The openings of the air outlet grooves 80 are staggered circumferentially from the lower end of the spiral blades 5. The gas collecting hood 8 has an umbrella-shaped structure that gradually converges from bottom to top, which is used to gather and guide the airflow to the air outlet grooves 80. The end of the fan blades 71 is located inside the bottom of the gas collecting hood 8, so that the liquid dripping from the spiral blades 5 is guided down the outer wall of the gas collecting hood 8, thereby preventing the liquid from entering the interior of the gas collecting hood 8 through the air outlet grooves 80. The spiral blades 5 are made of thermally conductive materials (such as stainless steel and aluminum alloy), which utilize the high thermal conductivity of metal to quickly absorb the latent heat of the airflow, so that the surface temperature of the blades is lower than the dew point, promoting the continuous condensation of water vapor. The spiral shape also divides, turns and mixes the airflow, eliminates temperature and humidity stratification, and makes the test samples representative.

[0029] The bottom of the gas collecting hood 8 forms a large-diameter air inlet, and the top of the hood forms a small-diameter air outlet. An air outlet groove 80 is opened on the side wall of the gas collecting hood 8. When the airflow enters from the large-diameter end of the gas collecting hood 8 and is ejected through the air outlet groove 80, the flow cross section changes from large to small, resulting in a compression acceleration effect. This causes the airflow temperature to drop, prompting water vapor to reach saturation and condense, thereby actively reducing the airflow humidity and protecting the sensing module of the transmitter body 1. The accelerated airflow impacts the surface of the blades of the spiral blade 5. The spiral blade 5 divides, turns, and mixes the airflow, making the humidity and temperature distribution in the gas more uniform. The homogenized airflow rises to the sensing module of the transmitter body 1 for detection, thereby improving the representativeness and accuracy of the measurement of trace moisture content and density.

[0030] Furthermore, a liquid collection platform 24 is provided at the bottom of the inner cavity of the treatment cylinder 2. The liquid collection platform 24 is provided with an inverted conical liquid guiding surface for collecting liquid. A drain pipe 23 is connected to the lowest point of the bottom of the liquid collection platform 24. The drain pipe 23 extends outward through the cylinder wall of the treatment cylinder 2, and a discharge valve 231 is installed on the drain pipe 23. The liquid collection platform 24 uses gravity to automatically collect the condensate to the lowest point and discharges it periodically through the drain pipe 23 to prevent liquid accumulation from increasing airflow resistance or secondary evaporation.

[0031] In this embodiment, after the system is started, the motor 7 drives the fan blade 71 to rotate at high speed, generating negative pressure at the bottom of the gas collection hood 8. The SF6 gas in the GIS equipment 4 is sucked into the processing cylinder 2 through the air inlet pipe 21 and first enters the large-diameter bottom end of the gas collection hood 8. Since the gas collection hood 8 is a gradually converging umbrella shape, the gas flow cross section changes from large to small, the airflow speed increases, the static pressure decreases, and adiabatic expansion and cooling occur, causing some water vapor to reach saturation and begin to condense into tiny droplets.

[0032] Subsequently, the gas is ejected at high speed from the outlet groove 80 on the side wall of the gas collection hood 8. Due to the circumferential misalignment between the outlet groove 80 and the lower end of the spiral blade 5, the ejected airflow tangentially impacts the blade surface of the spiral blade 5. The spiral blade 5 is made of thermally conductive material, and its temperature is lower than that of the airflow. The water vapor in the airflow further condenses on the blade surface and gathers into larger water droplets. At the same time, the spiral structure of the spiral blade 5 forces the airflow to change direction multiple times, generating strong turbulent mixing, which makes the humidity and temperature distribution in the gas tend to be uniform.

[0033] The clean gas, after dehumidification and mixing, continues to rise to the top of the processing cylinder 2. The sensor assembly 12 of the transmitter body 1 collects pressure, temperature, and humidity signals. The signal processing assembly calculates the standard density at 20°C based on the real-time pressure and temperature using the temperature compensation formula, and calculates the ppm trace moisture content based on the ratio of water vapor partial pressure to SF6 partial pressure using the pressure and humidity. The processed digital signal is uploaded to the monitoring host 3 via RS-485 / CAN bus using the IEC 61850 or Modbus protocol.

[0034] The gas returns to the GIS equipment 4 through the exhaust pipe 22, forming a closed loop. Under the action of gravity, the condensate droplets slide down the surface of the spiral blade 5 and the outer wall of the gas collection hood 8 to the liquid collection platform 24, and are periodically discharged through the discharge valve 231 and the liquid discharge pipe 23.

[0035] In this embodiment, the compression and accelerated cooling of the gas collection hood 8 and the condensation of the spiral blades 5 can actively remove moisture from the airflow, preventing the sensing module of the transmitter body 1 from being exposed to a high humidity environment for a long time, thus extending the calibration cycle and service life. The airflow is fully mixed by the spiral blades 5, and the temperature and humidity are evenly distributed. The sample collected by the transmitter body 1 is representative, so the calculated density and trace moisture content are more accurate and reliable.

[0036] Example 2, refer to Figures 4-12 The cleaning assembly includes a drive shaft 72, a reduction mechanism 9, and a scraper 98. The end of the drive shaft 72 is fixedly connected to the center of the fan blade 71. When the motor 7 rotates, the drive shaft 72 rotates synchronously. The drive shaft 72 is rotatably engaged between the air collection hood 8, the upper cylinder 51, and the lower cylinder 52, and its top end extends to the upper side of the upper cylinder 51.

[0037] Furthermore, the reduction mechanism 9 includes an internal gear ring 91 fixedly mounted on the top of the upper cylinder 51, a sun gear 93 rotatably mounted at the center of the internal gear ring 91, a plurality of planet gears 92 meshing with the sun gear 93 and the internal gear ring 91 respectively, and a planet carrier 94 for mounting each planet gear 92; the sun gear 93 is fixedly connected to the top end of the drive shaft 72, and an isolation cover 95 for limiting the movement of the planet gears 92 and the planet carrier 94 is fixedly connected to the top of the internal gear ring 91. The fan blades 71 often require a high rotational speed (typically 2000–5000 rpm) to generate sufficient airflow. The wiping mechanism 97 requires a lower rotation speed (usually 10-60 rpm) to clean the sensor module surface, avoiding damage due to excessive rotation speed. The planetary reduction mechanism 9 can provide a large reduction ratio, converting high-speed rotation into a low-speed, high-torque output suitable for cleaning. At the same time, the planetary structure has the advantages of small size, smooth transmission, and strong load-bearing capacity. The top of the planetary carrier 94 is fixedly connected to the push mechanism 96, and the output end of the push mechanism 96 is fixedly connected to the wiping mechanism 97. The push mechanism 96 is coaxially set with the transmitter body 1. The scraper 98 is fixed on the upper side of the isolation cover 95.

[0038] Furthermore, the pushing mechanism 96 is an electric push rod or a pneumatic push rod; the bottom of the wiping mechanism 97 is a rigid plate with elasticity, and the top is equipped with a detachable wiping block. The elastic design can buffer the pressure when the wiping block contacts the sensing module, avoiding damage to the surface of the sensing module due to excessive pressure; the rigid plate provides uniform support for the wiping block, ensuring that the wiping area is fully covered. The wiping mechanism 97 needs to contact the sensing module during cleaning and detach and maintain a certain distance during detection to avoid wear or interference with measurement caused by long-term contact. The wiping block is a consumable, and the detachable design facilitates regular replacement, reducing long-term operation and maintenance costs; the wiping mechanism 97 has a coverage area that can completely cover the sensing module of the transmitter body 1.

[0039] It should be noted that when the pushing mechanism 96 is in its initial state, the wiping mechanism 97 is located below the scraper 98. When the wiping mechanism 97 rotates, the wiping block at its top intermittently contacts the bottom of the scraper 98, thereby scraping away the contaminants adsorbed on the surface of the wiping block, achieving self-cleaning of the wiping block and extending its service life. After the pushing mechanism 96 extends, the wiping block at the top of the wiping mechanism 97 abuts against the bottom sensing module of the transmitter body 1. At this time, the wiping mechanism 97 is located above the scraper 98 and does not interfere with the scraper 98. The pushing mechanism 96 realizes the lifting and lowering switching of the wiping mechanism 97, so that the cleaning action can be started as needed without affecting the normal detection work of the transmitter body 1. At the same time, the contact pressure between the wiping mechanism 97 and the sensing module can be flexibly adjusted.

[0040] In this embodiment, when the system is running normally, the motor 7 drives the fan blade 71 to rotate at high speed, and the transmission shaft 72 rotates synchronously. The top end of the transmission shaft 72 is fixedly connected to the sun gear 93, driving the sun gear 93 to rotate at high speed. The sun gear 93 meshes with multiple planet gears 92, and the planet gears 92 mesh with the fixedly set internal gear ring 91. Since the internal gear ring 91 is fixed, the planet gears 92 revolve around the sun gear 93 while rotating on their own axis. The planet carrier 94 is driven to rotate by the revolution of the planet gears 92. By selecting the tooth ratio of the sun gear 93, planet gears 92 and internal gear ring 91, a larger reduction ratio (e.g., 1:30 to 1:100) can be achieved, so that the planet carrier 94 can obtain a lower output speed.

[0041] A push mechanism 96 is fixedly connected to the top of the planetary carrier 94. The push mechanism 96 rotates synchronously with the planetary carrier 94. The output end of the push mechanism 96 is connected to the wiping mechanism 97. Therefore, the wiping mechanism 97 not only revolves with the planetary carrier 94, but can also be raised and lowered under the drive of the push mechanism 96.

[0042] Under normal testing conditions, the actuator 96 is in the retracted state (initial state, refer to...). Figure 7 The wiping mechanism 97 is located below the scraper 98. At this time, the wiping mechanism 97 rotates with the planetary carrier 94. The wiping block at the top of the mechanism intermittently contacts the bottom of the fixed scraper 98. As the wiping block repeatedly passes through the scraper 98 during rotation, the scraper 98 removes the dust, oil, or residual water stains attached to the surface of the wiping block, keeping the wiping block clean.

[0043] When the system requires cleaning of the sensor module (e.g., triggered periodically according to a preset cycle, or issued by the monitoring host 3 when the monitoring data shows abnormal fluctuations), the control system activates the extension of the push mechanism 96. The push mechanism 96 pushes the wiping mechanism 97 upward, so that the wiping block at its top comes into close contact with the sensor module at the bottom of the transmitter body 1 (see reference). Figure 9At this time, the wiping mechanism 97 is located above the scraper 98 and is no longer in contact with the scraper 98, so they do not interfere with each other. Since the wiping mechanism 97 is still rotating slowly, the wiping block makes a circular friction motion relative to the surface of the sensing module, effectively removing the condensate film, solid particles or oil stains attached to the surface of the sensing module.

[0044] After the cleaning action continues for a preset time (e.g., 10-30 seconds), the push mechanism 96 retracts, the wiping mechanism 97 descends and resets, returning to the underside of the scraper 98. During the rotation after reset, the wiping block contacts the scraper 98 again, scraping away the contaminants adsorbed during the cleaning process, completing the self-cleaning of the wiping block. Afterward, the system continues to perform normal micro-moisture density detection.

[0045] This invention utilizes the existing fan blades 71 in the system to drive the cleaning component. The planetary reduction mechanism 9 provides a large reduction ratio, allowing the wiping mechanism 97 to rotate at a low speed suitable for cleaning. This ensures cleaning effectiveness while preventing scratches on the sensor module surface due to excessive rotation speed. The pushing mechanism 96 enables the wiping mechanism 97 to switch between lifting and lowering, contacting during cleaning and separating during detection, ensuring that the normal measurement of the transmitter body 1 is not affected. The scraper 98 intermittently contacts the wiping block during idling, automatically scraping away contaminants on the surface of the wiping block, extending its service life and reducing the frequency of manual maintenance. The elastic hard plate at the bottom of the wiping mechanism 97 can buffer the contact pressure between the wiping block and the sensor module, preventing damage to the sensor module or wiping block due to excessive pressure. The cleaning component can automatically execute the cleaning program according to a preset cycle without manual intervention, improving the system's intelligence level, and is especially suitable for unattended substations.

[0046] Example 3, referring to Figures 4-11 The vibration assembly includes a cylindrical cam 6, a roller 61, a slide rod 62, and several limiting holes 50 on the blades of the spiral blade 5. The cylindrical cam 6 is rotatably mounted between the upper cylinder 51 and the lower cylinder 52, and is fixedly connected to the drive shaft 72. The cylindrical cam 6 has a cam groove, and the roller 61 is slidably embedded in the cam groove. The slide rod 62 slides through the limiting holes 50 onto the spiral blade 5. The limiting holes 50 guide and limit the slide rod 62, ensuring that the slide rod 62 moves linearly along the axial direction and preventing sway. The slide rod 62 has mounting holes and screws. The groove 621 has a mounting hole with a fixing bolt 611. The fixing bolt 611 is threadedly connected to the roller 61, and the fixing bolt 611 rigidly connects the roller 61 to the slide rod 62, ensuring that the axial displacement of the roller 61 is accurately transmitted to the slide rod 62, thus ensuring the accuracy of the vibration timing. When the cylindrical cam 6 rotates, the axial undulation of the cam groove can convert the continuous rotational motion into the axial reciprocating motion of the roller 61, and the motion law is controllable (different displacement curves can be achieved through the trajectory design of the cam groove), thereby driving the slide rod 62 to reciprocate according to a predetermined stroke.

[0047] It should be noted that when the cylindrical cam 6 rotates, the cam groove and the roller 61 cooperate to drive the slide rod 62 to move axially. In turn, the friction between the edge of the threaded part 621 and the edge of the limiting hole 50 causes the spiral blade 5 to vibrate. The threaded part 621 on the slide rod 62 is not used for fastening, but to use its sharp threaded edge to intermittently scrape against the edge of the hole wall of the limiting hole 50. When the slide rod 62 moves axially, the threaded edge scratches the edge of the limiting hole 50, generating a high-frequency micro-amplitude impact, thereby exciting the spiral blade 5 to vibrate as a whole. This design avoids adding a vibration source to the spiral blade 5 and does not affect the smooth flow of air.

[0048] In this embodiment, when the motor 7 drives the fan blade 71 to rotate, the transmission shaft 72 rotates synchronously. The cylindrical cam 6, which is fixedly connected to the transmission shaft 72, rotates accordingly. A closed cam groove is machined on the outer circumferential surface of the cylindrical cam 6. The cam groove has an axially undulating curved surface in the circumferential direction. The roller 61, which is embedded in the cam groove, reciprocates along the axial direction under the push of the side wall of the cam groove. Since the cam groove is closed, the roller 61 completes a full axial stroke with each rotation (for example, rising first and then falling, or falling first and then rising), thereby realizing continuous reciprocating movement.

[0049] Roller 61 is fixedly connected to slide rod 62 by fixing bolt 611. Therefore, slide rod 62 follows roller 61 to make the same axial reciprocating motion. Slide rod 62 passes through the limiting hole 50 opened on spiral plate 5. The diameter of limiting hole 50 is slightly larger than the diameter of slide rod 62 to ensure normal sliding. Slide rod 62 is provided with threaded part 621. The thread crest of threaded part 621 has a very small interference with the edge of limiting hole 50.

[0050] When the slide rod 62 moves axially back and forth, the edge of the threaded part 621 intermittently contacts the edge of the limiting hole 50. Due to the relatively fast movement speed of the slide rod 62 (determined by the rotation speed of the cylindrical cam 6), high-frequency scraping and impact are generated between the threaded edge and the edge of the limiting hole 50. This impact energy is transmitted to the spiral blade 5, causing the spiral blade 5 to generate high-frequency micro-amplitude vibration as a whole. The frequency of vibration depends on the rotation speed of the cylindrical cam 6 and the number of undulations of the cam groove (usually one or more reciprocations per revolution). The amplitude is determined by the axial stroke of the cam groove.

[0051] If condensate accumulates on the surface of the spiral blade 5 for a long time, a continuous water film will gradually form. The water film has a large thermal resistance, which will significantly reduce the heat exchange efficiency between the spiral blade 5 and the airflow, and reduce the condensation capacity of subsequent water vapor. Through periodic vibration, the water film is broken and falls off in beads, so that the surface of the spiral blade 5 always remains in a "dry" or "beaded condensation" state, thereby maintaining a high thermal conductivity and dehumidification performance.

[0052] Vibration not only causes water droplets to fall off the surface of the spiral blade 5, but also gives the water droplets a certain initial velocity, causing them to accelerate down the spiral blade 5 along the tilting direction of the blade. Combined with gravity, vibration can effectively shorten the residence time of condensate on the spiral blade 5, prevent water droplets from being carried away by the rising airflow, and ensure that the condensate drips smoothly onto the collection platform 24.

[0053] During long-term operation, SF6 gas may carry tiny solid impurities (such as metal particles generated by equipment wear and sulfur powder generated by electric arc decomposition). These particles are easy to deposit in the blade gaps of the spiral blade 5 or the edge of the limiting hole 50. When vibrating, the high-frequency micro-amplitude vibration of the spiral blade 5 will cause the particles attached to its surface to shift and fall off, and be washed away with the condensate and fall into the liquid collection platform 24, thereby reducing the obstruction of impurities to the airflow and the contamination of the sensor module of the transmitter body 1.

[0054] The cleaning component is used to clean the sensing module of the transmitter body 1, while the vibration component is used to clean the spiral blade 5. The two share the same power source (drive shaft 72) and their operation sequence can be coordinated. For example, the vibration component can be started before each wiping and cleaning to shake off the water droplets and particles accumulated on the spiral blade 5, so as to prevent the rising airflow from bringing the contaminants back to the sensing module during the cleaning process. The synergistic effect of vibration and wiping keeps the entire air path clean from the inlet to the outlet, significantly extending the manual maintenance cycle.

[0055] In addition, under long-term cooling and airflow impact, the spiral blade 5 may generate thermal and mechanical stress inside. Appropriate micro-vibration helps to release local stress concentration and reduce the risk of fatigue cracks caused by stress accumulation. Although the vibration amplitude is extremely small, long-term and regular micro-vibration is actually beneficial to the stress homogenization of metal materials and has a positive effect on extending the service life of the spiral blade 5.

[0056] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail. The specific model and specifications of the relevant electrical components need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in the field, so it will not be described in detail.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A GIS online micro-moisture density monitoring system, comprising a processing cylinder (2), a monitoring host (3), a GIS device (4), and a transmitter body (1) at least partially extending into the processing cylinder (2) and sealed to the processing cylinder (2), wherein the GIS device (4) is respectively provided with an exhaust pipe (22) communicating with the top of its chamber and an air inlet pipe (21) communicating with the bottom of its chamber, and the chamber of the GIS device (4) is connected to the inner cavity of the processing cylinder (2) through the air inlet pipe (21) and the exhaust pipe (22); characterized in that, Also includes: Uniform flow dehumidification component, which is disposed in the processing cylinder (2) and is used to guide the gas flow and remove moisture from the gas; A cleaning component is disposed on top of the uniform flow dehumidification component and is used to clean the sensing module of the transmitter body (1). A vibration component, which is disposed on the uniform flow dehumidification component, is used to remove condensed water droplets to maintain dehumidification efficiency.

2. The GIS online micro-water density monitoring system according to claim 1, characterized in that, The transmitter body (1) is fixedly installed on the top of the processing cylinder (2). A base (11) is provided at the lower end of the transmitter body (1). A sensor assembly (12) and a signal processing assembly are integrated on the base (11). The base (11) is sealed to the processing cylinder (2). The sensor assembly (12) is located at the top of the inner cavity of the processing cylinder (2) and is used to collect pressure signals, temperature signals and humidity signals inside the processing cylinder (2). The signal processing component is communicatively connected to the sensor component (12). The signal processing component obtains pressure, temperature and humidity values ​​based on the signals collected by the sensor component (12), and calculates the gas density under standard conditions at 20°C based on the pressure and temperature values ​​through temperature compensation; and obtains the micro water content in ppm by calculating the ratio of water vapor partial pressure to SF6 gas partial pressure based on the pressure and humidity values.

3. The GIS online micro-water density monitoring system according to claim 2, characterized in that, The transmitter body (1) is communicatively connected to the monitoring host (3). The digital signal output by the signal processing component is transmitted to the monitoring host (3) via RS-485 bus or CAN bus and in accordance with IEC 61850 protocol or Modbus protocol.

4. The GIS online micro-water density monitoring system according to claim 1, characterized in that, The uniform flow dehumidification assembly includes a spiral blade (5), a motor (7), and a gas collection hood (8) arranged sequentially from top to bottom. The motor (7) is fixed inside the processing cylinder (2) by a bracket (73). The output end of the motor (7) is fixedly connected to a fan blade (71). The spiral blade (5) is fixed in the upper part of the inner cavity of the processing cylinder (2). The top of the spiral blade (5) is close to the sensing module of the transmitter body (1). The lower end of the spiral blade (5) is located above the gas collection hood (8). The upper cylinder (51) and the lower cylinder (52) are fixedly connected inside the spiral blade (5). The lower end of the lower cylinder (52) is threadedly connected to the gas collection hood (8).

5. The GIS online micro-water density monitoring system according to claim 4, characterized in that, The gas collection hood (8) is assembled from a hood body one (81) and a hood body two (82) and fixed with bolts. Both the hood body one (81) and the hood body two (82) are provided with air outlet grooves (80). The opening of the air outlet groove (80) is offset from the lower end of the spiral blade (5) in the circumferential direction. The gas collection hood (8) has an umbrella-shaped structure that gradually converges from bottom to top. The end of the fan blade (71) is located inside the bottom end of the gas collection hood (8). The spiral blade (5) is made of thermally conductive material.

6. The GIS online micro-water density monitoring system according to claim 4, characterized in that, The cleaning assembly includes a drive shaft (72), a reduction mechanism (9), and a scraper (98). The end of the drive shaft (72) is fixedly connected to the center of the fan blade (71). The drive shaft (72) is rotatably engaged between the air collection hood (8), the upper cylinder (51), and the lower cylinder (52), and its top end extends to the upper side of the upper cylinder (51). The deceleration mechanism (9) includes an internal gear ring (91) fixedly mounted on the top of the upper cylinder (51), a sun gear (93) rotatably mounted at the center of the internal gear ring (91), a plurality of planet gears (92) meshing with the sun gear (93) and the internal gear ring (91) respectively, and a planet carrier (94) for mounting each of the planet gears (92); the sun gear (93) is fixedly connected to the top end of the transmission shaft (72), the top of the internal gear ring (91) is fixedly connected to an isolation cover (95) for limiting the planet gears (92) and the planet carrier (94), the top of the planet carrier (94) is fixedly connected to a push mechanism (96), the output end of the push mechanism (96) is fixedly connected to a wiping mechanism (97), the push mechanism (96) is coaxially mounted with the transmitter body (1); the scraper (98) is fixed on the upper side of the isolation cover (95).

7. The GIS online micro-water density monitoring system according to claim 6, characterized in that, The pushing mechanism (96) is an electric push rod or a pneumatic push rod; the bottom of the wiping mechanism (97) is a rigid plate with elasticity, and the top is provided with a detachable wiping block; the wiping mechanism (97) has a coverage area that can completely cover the sensing module of the transmitter body (1); When the pushing mechanism (96) is in the initial state, the wiping mechanism (97) is located below the scraper (98). When the wiping mechanism (97) rotates, the wiping block at the top of the wiping mechanism (97) intermittently contacts the bottom of the scraper (98). After the pushing mechanism (96) extends, the wiping block at the top of the wiping mechanism (97) abuts against the bottom sensing module of the transmitter body (1). At this time, the wiping mechanism (97) is located above the scraper (98) and does not interfere with the scraper (98).

8. The GIS online micro-water density monitoring system according to claim 4, characterized in that, The vibration assembly includes a cylindrical cam (6), a roller (61), a slide rod (62), and several limiting holes (50) on the blades of the spiral blade (5). The cylindrical cam (6) is rotatably disposed between the upper cylinder (51) and the lower cylinder (52). The cylindrical cam (6) is fixedly connected to the drive shaft (72). The cylindrical cam (6) is provided with a cam groove, and the roller (61) is slidably embedded in the cam groove. The slide rod (62) is slidably passed through the limiting holes (50) on the spiral blade (5). The slide rod (62) is provided with a mounting hole and a threaded part (621). A fixing bolt (611) is provided in the mounting hole, and the fixing bolt (611) is threadedly connected to the roller (61). When the cylindrical cam (6) rotates, the sliding rod (62) moves axially through the cooperation between the cam groove and the roller (61), and then the spiral blade (5) vibrates through the friction between the edge of the threaded part (621) and the edge of the limiting hole (50).

9. The GIS online micro-water density monitoring system according to claim 1, characterized in that, The bottom of the inner cavity of the processing cylinder (2) is provided with a liquid collection platform (24), and the liquid collection platform (24) is provided with an inverted conical liquid guiding surface for collecting liquid.

10. A GIS online micro-water density monitoring system according to claim 9, characterized in that, The lowest point of the liquid collection platform (24) is connected to a drain pipe (23), which extends outward through the wall of the processing cylinder (2), and a discharge valve (231) is installed on the drain pipe (23).

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