SF6 gas leakage multi-sensor fusion detection device of gas-insulated switchgear

Abstract

The invention discloses a multi-sensor fusion detection device for SF6 gas leakage of a gas-insulated switchgear, which comprises a gas-insulated switchgear gas tank, a master controller and a bus tube, the master controller is mounted on the outer side of the gas-insulated switchgear gas tank, the bus tube is mounted in the gas-insulated switchgear gas tank, a flange plate is fixedly mounted on the outer side of the bus tube, and the flange plate is fixedly mounted on the inner side of the gas-insulated switchgear gas tank. The flange plate is detachably connected to the inner wall of the gas tank of the gas-insulated switchgear through bolts, a high-level monitoring system, a middle-level monitoring system and a bottom-level monitoring system are arranged in the gas tank of the gas-insulated switchgear, and the high-level monitoring system, the middle-level monitoring system and the bottom-level monitoring system are all connected with the main controller. The design that the middle-layer monitoring system is arranged on the flange plate in a sleeving mode has the unique advantages, the flange connecting part with the highest leakage probability is directly monitored, compared with a traditional far-end detection mode, the response speed is increased, meanwhile, gas vortexes are formed through cooperation with the inclination angle of the V-shaped groove and the flange mounting face, and the capture capacity for trace leakage is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas filling cabinets, and more particularly to a multi-sensor fusion detection device for SF6 gas leakage in gas filling cabinets. Background Art

[0002] In power systems, gas cabinets, as crucial distribution equipment, widely utilize SF6 gas as an insulating and arc-extinguishing medium. However, SF6 gas leaks not only degrade the insulation performance of these equipment but can also cause serious safety incidents. Furthermore, as a potent greenhouse gas, SF6 leaks can have serious environmental impacts. Therefore, real-time, accurate detection of SF6 gas leaks in gas cabinets is crucial.

[0003] Traditional SF6 leakage detection methods are mainly divided into two categories: 1. The pressure monitoring method determines leaks by monitoring changes in the internal pressure of the gas tank. However, this method has a delayed response and cannot distinguish between pressure changes caused by temperature fluctuations and actual leaks, which can easily lead to false alarms. 2. Infrared or ultrasonic detection methods rely on regular inspections of external detection equipment, cannot achieve real-time monitoring, and are greatly affected by environmental interference, making it difficult to accurately locate the leak point.

[0004] Some improvement schemes in the existing technology use a single sensor (such as an electrochemical sensor or a laser spectrometer) for leak detection, but problems still exist. The sensor is usually fixedly installed in a certain position of the gas box, and it is difficult to cover leak-prone areas such as flange sealing surfaces and welds. At the same time, changes in environmental temperature and humidity, equipment vibration, etc. can easily lead to false alarms. In addition, the flange connection of the inflation cabinet is a typical high-incidence area of leakage, and the existing detection devices are often not optimized for this area, resulting in difficulty in timely detection of trace leaks. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a multi-sensor fusion detection device for SF6 gas leakage of an inflatable cabinet to solve the background technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: The multi-sensor fusion detection device for SF6 gas leakage of the gas cabinet includes a gas cabinet gas box, a main controller and a busbar pipe. The main controller is installed on the outside of the gas cabinet gas box, and the busbar pipe is installed inside the gas cabinet gas box. It is characterized in that a flange is fixedly installed on the outside of the busbar pipe, and the flange is detachably connected to the inner wall of the gas cabinet gas box by bolts. The inside of the gas cabinet gas box is provided with a high-level monitoring system, a middle-level monitoring system and a bottom-level monitoring system, and the high-level monitoring system, the middle-level monitoring system and the bottom-level monitoring system are all connected to the main controller.

[0007] The high-rise monitoring system includes an NDIR sensor and a digital pressure transmitter. The NDIR sensor is fixed to the inner side of the gas tank top plate of the gas cabinet through a threaded interface. The digital pressure transmitter is welded to the leak detection port on the top of the gas tank of the gas cabinet. The NDIR sensor and the digital pressure transmitter are both connected to the main controller. The mid-level monitoring system includes a monitoring ring, which is mounted on the inner wall of the gas box of the gas cabinet. The flange is located on the inner side of the monitoring ring. An annular air passage is formed inside the monitoring ring. Three air inlet holes are formed on the outer side of the monitoring ring. The air inlet holes are connected to the interior of the annular air passage. Three monitoring components are arranged inside the monitoring ring. The monitoring component includes a pre-filter chamber and an analysis chamber, both of which are located inside the annular airway. An ultrasonic sensor, an electrochemical SF6 sensor, and a temperature probe are installed inside the analysis chamber, and the ultrasonic sensor, electrochemical SF6 sensor, and temperature probe are all connected to the main controller; The bottom-level monitoring system includes a laser spectrum sensor and a temperature and humidity composite probe. The laser spectrum sensor is installed on the inner bottom wall of the gas cabinet air box, and the temperature and humidity composite probe is installed on the outer wall of the gas cabinet air box. The laser spectrum sensor and the temperature and humidity composite probe are both connected to the main controller signal.

[0008] As a further description of the above technical solution: three exhaust valves are installed on the outside of the monitoring ring, and the exhaust valves are connected to the interior of the analysis chamber.

[0009] As a further description of the above technical solution: a sealing ring is fixedly installed on the right side of the monitoring ring, and the sealing ring is in contact with the flange.

[0010] As a further description of the above technical solution: three V-shaped grooves are opened on the inner wall of the inflation cabinet, the V-shaped grooves correspond to the positions of the air inlet holes, and the two side walls of the V-shaped grooves have smooth surfaces.

[0011] As a further description of the above technical solution: the pre-filter chamber is provided with a sintered metal filter element and a turbulence suppression net, and the turbulence suppression net is located at the front end of the sintered metal filter element.

[0012] As a further description of the above technical solution: a buzzer alarm is installed on the outside of the air box of the inflatable cabinet, and the buzzer alarm is connected to the main controller signal.

[0013] As a further description of the above technical solution: a magnetic flange is adsorbed on the outside of the gas cabinet air box, and the temperature and humidity composite probe is fixedly installed on the bottom of the gas cabinet air box through the magnetic flange. The magnetic flange contains a neodymium iron boron magnetic ring and a thermal conductive silicone pad, and the thermal conductive silicone pad is fitted with the gas cabinet air box.

[0014] As a further description of the above technical solution: a communication module is integrated in the main controller, and the main controller transmits information to the cloud, the local server and the mobile terminal through the communication module.

[0015] Compared with the prior art, the advantages of the present invention are: (1) The present invention achieves full coverage of leak detection through the coordinated work of the three-level monitoring system inside the gas tank of the inflatable cabinet. The digital pressure transmitter of the high-level monitoring system can sense abnormal pressure changes in real time. The middle-level monitoring system uses a V-shaped groove with an inclination angle of 120 degrees and three groups of monitoring modules evenly distributed at 120 degrees to form an efficient gas collection structure, which can quickly capture leaked gas and guide it to the analysis room for accurate detection. The combination of the laser spectrum sensor and the temperature and humidity composite probe of the bottom-level monitoring system can eliminate environmental interference; The design of the mid-level monitoring system mounted on the flange has unique advantages. It directly monitors the flange connection where the leakage probability is the highest. Compared with traditional remote detection methods, the response speed is improved. At the same time, the inclination of the V-groove and the flange mounting surface form a gas vortex, which enhances the ability to capture trace leaks. Multi-sensor data fusion technology greatly improves detection accuracy and reliability through intelligent algorithm processing of the main controller. The modular design of the monitoring ring is easy to maintain and replace. The turbulence suppression net and sintered metal filter element in the pre-filter chamber can ensure detection stability. When a leak is confirmed, the communication module remotely transmits the alarm information. The entire device has outstanding advantages such as fast response, accurate positioning, and strong anti-interference ability, which effectively ensures the safe operation of the inflatable cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main framework principle of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the gas box of the inflatable cabinet of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the middle-level monitoring system of the present invention; Figure 4 Schematic diagram of the cross-sectional structure of the monitoring ring of the present invention; Figure 5 Schematic diagram of the three-dimensional structure of the monitoring ring of the present invention; Figure 6 Schematic diagram of the side cross-sectional structure of the monitoring ring of the present invention; Figure 7 It is a schematic diagram of the principle of the present invention.

[0017] Description of the numbers in the figure: 1. Gas cabinet gas box; 2. Main controller; 3. Busbar; 4. Flange; 5. Communication module; 6. High-level monitoring system; 601. NDIR sensor; 602. Digital pressure transmitter; 7. Middle-level monitoring system; 701. Monitoring ring; 702. Annular air duct; 703. Air inlet; 704. Monitoring component; 7041. Prefilter chamber; 7042. Analysis chamber; 7043. Ultrasonic sensor; 7044. Electrochemical SF6 sensor; 7045. Temperature probe; 8. Bottom-level monitoring system; 801. Laser spectrum sensor; 802. Temperature and humidity composite probe; 9. Exhaust valve; 10. Sealing ring; 11. V-groove; 12. Sintered metal filter element; 13. Turbulence suppression net; 14. Buzzer alarm; 15. Magnetic flange; 1501. NdFeB magnetic ring; 1502. Thermal conductive silicone pad. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention; See also Figures 1 to 7 In the present invention, the SF6 gas leakage multi-sensor fusion detection device of the gas cabinet includes a gas cabinet gas box 1, a main controller 2 and a busbar pipe 3. The main controller 2 is installed on the outside of the gas cabinet gas box 1, and the busbar pipe 3 is installed inside the gas cabinet gas box 1. A flange 4 is fixedly installed on the outside of the busbar pipe 3, and the flange 4 is detachably connected to the inner wall of the gas cabinet gas box 1 by bolts. A high-level monitoring system 6, a middle-level monitoring system 7 and a bottom-level monitoring system 8 are arranged inside the gas cabinet gas box 1, and the high-level monitoring system 6, the middle-level monitoring system 7 and the bottom-level monitoring system 8 are all connected to the main controller 2.

[0019] The high-level monitoring system 6 includes an NDIR sensor 601 and a digital pressure transmitter 602. The NDIR sensor 601 is fixed to the inner side of the top plate of the gas cabinet gas box 1 through a threaded interface, and the digital pressure transmitter 602 is welded to the leak detection port on the top of the gas cabinet gas box 1. The NDIR sensor 601 and the digital pressure transmitter 602 are both connected to the main controller 2.

[0020] The middle-level monitoring system 7 includes a monitoring ring 701, which is installed on the inner wall of the gas box 1 of the inflatable cabinet. The flange 4 is located on the inner side of the monitoring ring 701. An annular air duct 702 is provided inside the monitoring ring 701. Three air inlet holes 703 are provided on the outside of the monitoring ring 701. The air inlet holes 703 are connected to the inside of the annular air duct 702. Three monitoring components 704 are arranged inside the monitoring ring 701. Three exhaust valves 9 are installed on the outside of the monitoring ring 701. The exhaust valves 9 are connected to the inside of the analysis chamber 7042.

[0021] The monitoring component 704 includes a pre-filter chamber 7041 and an analysis chamber 7042. The pre-filter chamber 7041 and the analysis chamber 7042 are both located inside the annular airway 702. An ultrasonic sensor 7043, an electrochemical SF6 sensor 7044 and a temperature probe 7045 are installed inside the analysis chamber 7042. The ultrasonic sensor 7043, the electrochemical SF6 sensor 7044 and the temperature probe 7045 are all connected to the main controller 2.

[0022] The bottom monitoring system 8 includes a laser spectrum sensor 801 and a temperature and humidity composite probe 802. The laser spectrum sensor 801 is installed on the inner bottom wall of the gas cabinet air box 1, and the temperature and humidity composite probe 802 is installed on the outer wall of the gas cabinet air box 1. The laser spectrum sensor 801 and the temperature and humidity composite probe 802 are both connected to the main controller 2 signal.

[0023] Three V-shaped grooves 11 are provided on the inner wall of the inflation cabinet, and the V-shaped grooves 11 correspond to the positions of the air inlet holes 703 , and the two side walls of the V-shaped grooves 11 are smooth; the pre-filter chamber 7041 is provided with a sintered metal filter element 12 and a turbulence suppression net 13 , and the turbulence suppression net 13 is located at the front end of the sintered metal filter element 12 .

[0024] A magnetic flange 15 is adsorbed on the outside of the gas cabinet gas box 1, and the temperature and humidity composite probe 802 is fixedly installed on the bottom of the gas cabinet gas box 1 through the magnetic flange 15. The magnetic flange 15 includes a neodymium iron boron magnetic ring 1501 and a thermal conductive silicone pad 1502, and the thermal conductive silicone pad 1502 is in contact with the gas cabinet gas box 1.

[0025] The main controller 2 is integrated with a communication module 5 , and the main controller 2 transmits information to the cloud, the local server and the mobile terminal through the communication module 5 .

[0026] When the gas cabinet gas tank 1 is operating normally, the SF6 gas maintains the rated pressure sealed state, and each monitoring system is in a real-time monitoring state; When a leak occurs, SF6 gas will first settle to the bottom of the gas cabinet gas box 1 due to its density characteristics. At this time, the laser spectrum sensor 801 of the bottom monitoring system 8 based on the tunable laser absorption spectroscopy technology will first detect the abnormal bottom concentration. At the same time, the temperature and humidity composite probe 802 provides environmental compensation data, and the digital pressure transmitter 602 of the high-level monitoring system 6 monitors the pressure change trend in real time.

[0027] As the leakage continued, the middle-level monitoring system 7 started to work. The middle-level monitoring system 7 was innovatively installed on the flange 4 of the gas filling cabinet. The flange 4 area is a weak link in the structural connection of the gas filling cabinet and is a high-incidence area for SF6 gas leakage. The installation of a monitoring ring 701 here can realize direct detection of the source of the leakage. The monitoring ring 701 and the flange 4 adopt a coaxial sleeve structure, and its inner diameter maintains a precise gap with the flange sealing surface, which not only ensures the stability of the installation, but also forms an annular gas collection channel.

[0028] Its specially designed V-groove 11 adopts a 60-degree inclination angle structure, and is combined with three groups of monitoring modules arranged in a ring, with each group of 120 degrees forming an efficient gas collection system. The Venturi effect is used to introduce the leaked gas into the air inlet 703. The gas enters the analysis chamber 7042 after being processed by the turbulence suppression net 13 and the sintered metal filter element 12 of the pre-filter chamber 7041. The ultrasonic sensor 7043 detects changes in gas density, the electrochemical SF6 sensor 7044 accurately measures the concentration, and the temperature probe 7045 provides temperature compensation. The main controller 2 uses a data fusion algorithm to process multi-source information. When the detection results of the bottom layer and the middle layer are consistent and the pressure continues to drop, it is determined to be a substantial leak, and the alarm information is uploaded through the communication module 5.

[0029] In the present invention, through the coordinated work of the three-level monitoring system inside the gas cabinet gas box 1, all-round coverage of leakage detection is achieved. The digital pressure transmitter 602 of the high-level monitoring system 6 can sense abnormal pressure changes in real time. The middle-level monitoring system 7 adopts a V-shaped groove 11 with a 60-degree inclination angle and three groups of monitoring modules evenly distributed at 120 degrees to form an efficient gas collection structure, which can quickly capture leaked gas and guide it to the analysis room 7042 for precise detection. The combination of the laser spectrum sensor 801 and the temperature and humidity composite probe 802 of the bottom-level monitoring system 8 can eliminate environmental interference.

[0030] The design of the mid-level monitoring system 7 installed on the flange plate 4 has a unique advantage. It directly monitors the flange connection part with the highest probability of leakage. Compared with traditional remote detection methods, the response speed is improved. At the same time, the inclination of the V-shaped groove 11 and the flange mounting surface form a gas vortex, which enhances the ability to capture trace leaks. Multi-sensor data fusion technology greatly improves detection accuracy and reliability through intelligent algorithm processing of the main controller 2. The modular design of the monitoring ring 701 is easy to maintain and replace. The turbulence suppression net 13 and sintered metal filter element 12 in its pre-filter chamber 7041 can ensure detection stability. When a leak is confirmed, the communication module 5 remotely transmits the alarm information. The entire device has outstanding advantages such as fast response, accurate positioning, and strong anti-interference ability, which effectively ensures the safe operation of the inflatable cabinet.

[0031] See also Figures 2 to 5 , wherein: a sealing ring 10 is fixedly installed on the right side of the monitoring ring 701, and the sealing ring 10 is in contact with the flange 4.

[0032] In the present invention, the sealing structure forms an airtight connection between the monitoring ring 701 and the flange 4, which not only avoids the detection error caused by SF6 gas leakage, but also prevents secondary pollution caused by gas leakage during the detection process.

[0033] See also Figure 1 and 2, wherein: a buzzer alarm 14 is installed on the outside of the inflatable cabinet gas box 1, and the buzzer alarm 14 is connected to the main controller 2 signal.

[0034] In the present invention, when the main controller 2 confirms a gas leak through the three-level monitoring system, it can immediately drive the buzzer alarm 14 to issue a high-decibel alarm. This integrated sound and light alarm method ensures that the operator can be reminded in time under complex working conditions, greatly improving the safety and reliability of the entire system.

[0035] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A multi-sensor fusion detection device for SF6 gas leakage of a gas cabinet, comprising a gas cabinet gas box (1), a main controller (2) and a busbar tube (3), wherein the main controller (2) is installed outside the gas cabinet gas box (1), and the busbar tube (3) is installed inside the gas cabinet gas box (1), characterized in that: A flange (4) is fixedly mounted on the outer side of the busbar tube (3), and the flange (4) is detachably connected to the inner wall of the gas cabinet gas box (1) by bolts. A high-level monitoring system (6), a middle-level monitoring system (7), and a bottom-level monitoring system (8) are arranged inside the gas cabinet gas box (1), and the high-level monitoring system (6), the middle-level monitoring system (7), and the bottom-level monitoring system (8) are all connected to the main controller (2); The high-level monitoring system (6) includes an NDIR sensor (601) and a digital pressure transmitter (602), wherein the NDIR sensor (601) is fixed to the inner side of the top plate of the gas cabinet gas box (1) through a threaded interface, and the digital pressure transmitter (602) is welded to the leak detection port on the top of the gas cabinet gas box (1), and the NDIR sensor (601) and the digital pressure transmitter (602) are both connected to the main controller (2); The middle-level monitoring system (7) includes a monitoring ring (701), the monitoring ring (701) is mounted on the inner wall of the gas box (1) of the gas cabinet, the flange (4) is located on the inner side of the monitoring ring (701), an annular air passage (702) is provided inside the monitoring ring (701), three air inlet holes (703) are provided on the outer side of the monitoring ring (701), the air inlet holes (703) are connected to the inside of the annular air passage (702), and three monitoring components (704) are provided inside the monitoring ring (701); The monitoring component (704) includes a pre-filter chamber (7041) and an analysis chamber (7042), both of which are located inside the annular airway (702), and an ultrasonic sensor (7043), an electrochemical SF6 sensor (7044), and a temperature probe (7045) are installed inside the analysis chamber (7042), and the ultrasonic sensor (7043), the electrochemical SF6 sensor (7044), and the temperature probe (7045) are all connected to the main controller (2); The bottom monitoring system (8) includes a laser spectrum sensor (801) and a temperature and humidity composite probe (802), wherein the laser spectrum sensor (801) is installed on the inner bottom wall of the gas cabinet gas box (1), and the temperature and humidity composite probe (802) is installed on the outer wall of the gas cabinet gas box (1), and the laser spectrum sensor (801) and the temperature and humidity composite probe (802) are both connected to the main controller (2) for signal connection.

2. The SF6 gas leakage multi-sensor fusion detection device for a gas filling cabinet according to claim 1, characterized in that: Three exhaust valves (9) are installed on the outside of the monitoring ring (701), and the exhaust valves (9) are connected to the inside of the analysis chamber (7042).

3. The SF6 gas leakage multi-sensor fusion detection device for a gas filling cabinet according to claim 1, characterized in that: A sealing ring (10) is fixedly mounted on the right side of the monitoring ring (701), and the sealing ring (10) is in contact with the flange (4).

4. The SF6 gas leakage multi-sensor fusion detection device for a gas filling cabinet according to claim 1, characterized in that: Three V-shaped grooves (11) are provided on the inner wall of the gas filling cabinet. The V-shaped grooves (11) correspond to the positions of the air inlet holes (703). The surfaces of the two side walls of the V-shaped grooves (11) are smooth.

5. The SF6 gas leakage multi-sensor fusion detection device for a gas filling cabinet according to claim 1, characterized in that: The pre-filter chamber (7041) is provided with a sintered metal filter element (12) and a turbulence suppression net (13), and the turbulence suppression net (13) is located at the front end of the sintered metal filter element (12).

6. The SF6 gas leakage multi-sensor fusion detection device for a gas filling cabinet according to claim 1, characterized in that: A buzzer alarm (14) is installed on the outside of the gas cabinet gas box (1), and the buzzer alarm (14) is connected to the main controller (2) for signal communication.

7. The SF6 gas leakage multi-sensor fusion detection device for a gas filling cabinet according to claim 1, characterized in that: A magnetic flange (15) is adsorbed on the outside of the gas cabinet gas box (1), and the temperature and humidity composite probe (802) is fixedly installed on the bottom of the gas cabinet gas box (1) through the magnetic flange (15). The magnetic flange (15) includes a neodymium iron boron magnetic ring (1501) and a thermal conductive silicone pad (1502), and the thermal conductive silicone pad (1502) is in contact with the gas cabinet gas box (1).

8. The SF6 gas leakage multi-sensor fusion detection device for a gas filling cabinet according to claim 1, characterized in that: The main controller (2) is integrated with a communication module (5), and the main controller (2) transmits information to the cloud, a local server, and a mobile terminal via the communication module (5).

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