Detection and collection device and method for SF6 leakage gas of deep underground GIL electric power pipe gallery

Abstract

According to the detection and collection device and method for SF6 leakage gas of the deep underground GIL electric power pipe gallery, the device is arranged outside an SF6 pipeline bus, and real-time visual detection of SF6 leakage is achieved through a gas escape channel constructed by a non-pressure pipeline and a parallel path conduction pipe in combination with a camera and a leakage gas escape observation window; a water charging and discharging mechanism is adopted, so that a non-pressure totally-closed liquid-sealed totally-immersed environment is formed around an SF6 pipeline bus, leaked gas is forcibly gathered through an observation window, and a gas recovery mechanism is matched, so that the problem that SF6 gas leaked in a deep underground GIL electric power pipe gallery is difficult to collect is solved, and environmental pollution is reduced; and a detection model based on edge identification and deep learning is adopted, so that SF6 gas leakage and non-SF6 gas leakage can be distinguished, and the detection accuracy and the anti-interference capability are remarkably improved. According to the invention, full-process management and control of SF6 gas leakage of the deep underground GIL electric power pipe gallery are realized, and the system has the characteristics of monitoring accuracy, recovery timeliness and operation and maintenance intelligence.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechatronic engineering and relates to a device and method for detecting and collecting leaked gas. Background Art

[0002] High-voltage SF6 pipe bus, abbreviated as GIL in English, is a power transmission device. The metal shell adopts a fully welded connection method, and the internal conductor is supported on the shell by supports or pot-type insulators with gas separation functions. The inside is filled with 0.2 - 0.8 Mpa of SF6 insulating gas.

[0003] SF6, whose Chinese name is sulfur hexafluoride, is colorless, odorless, and non-toxic by itself. However, under certain specific conditions such as arc, high temperature, etc., sulfur hexafluoride may decompose to produce some toxic low fluorides, such as hydrogen fluoride, etc. If personnel inhale these decomposition products, it will cause irritation and harm to the respiratory tract, eyes, etc., and even endanger life in severe cases. Therefore, although GIL is a sealed structure, during long-term operation, due to reasons such as equipment aging and seal damage, there may be a situation of SF6 gas leakage. If the leaked gas accumulates in a closed space, it will cause asphyxiation of personnel when the concentration is too high. Moreover, the density of SF6 gas is about 6 times that of air. After leakage, it is easy to accumulate in low-lying areas. Places such as deep underground power cable galleries are more likely to have high concentrations of SF6, increasing the safety risk when personnel enter these areas. Therefore, in engineering, GIL must monitor the concentration of SF6 gas to promptly detect leakage and take corresponding measures, such as ventilation and air change, to reduce the concentration of the leaked gas and ensure the safety of personnel. In addition, SF6 is also a greenhouse gas, and its potential global warming impact is 23,500 times that of carbon dioxide. Although the leakage amount of SF6 gas in GIL is usually small, long-term accumulation will also have a certain impact on the environment.

[0004] For underground power cable galleries, monitoring and ventilation can reduce the leakage amount of SF6 gas and reduce the greenhouse effect impact on the environment. At the same time, during equipment maintenance, repair, etc., properly treating the discharged SF6 gas to avoid direct emission into the atmosphere is also an important measure and requirement in line with environmental protection requirements. However, for long-distance, multi-circuit GIL power cable galleries in deep underground spaces, due to multi-circuits and long distances, the number of GIL gas chamber units is huge, making it difficult to comprehensively and accurately actively monitor the tiny leakage and initial leakage of SF6 gas in GIL. Even if leakage is detected, due to the deep underground, long-distance, and large-space environment, it is impossible to discharge it in a timely and effective manner. Summary of the Invention

[0005] To solve the problems that it is difficult to comprehensively and accurately actively monitor the SF6 leakage gas in the deep underground GIL power pipe gallery described in the background technology and it cannot be discharged in a timely and effective manner, the present invention provides a detection and collection device and method for SF6 leakage gas in the deep underground GIL power pipe gallery.

[0006] The device of the present invention is arranged outside the SF6 pipeline bus. An unpressurized pipeline is arranged around the outside of the SF6 pipeline bus. A parallel path conduction pipe is arranged on the upper part of the unpressurized pipeline. The unpressurized pipeline and the parallel path conduction pipe are connected through a plurality of connecting pipes. A leakage gas escape observation window is arranged on the connecting pipe. A camera is arranged outside the leakage gas escape observation window. The upper part of the parallel path conduction pipe is connected with a water filling and discharging mechanism, and the side of the parallel path conduction pipe is connected with a gas recovery mechanism.

[0007] Further, a support member is arranged on the outer wall of the SF6 pipeline bus.

[0008] Further, when the SF6 pipeline bus is single-phase, both ends of the support member are connected to the outer wall of the SF6 pipeline bus and the inner wall of the unpressurized pipeline; when the SF6 pipeline bus is three-phase, both ends of the support member are connected to the outer walls of two adjacent SF6 pipeline buses. The design of the support member takes into account the support requirements of single-phase / three-phase busbars.

[0009] Further, a valve is arranged on the connecting pipeline between the water filling and discharging mechanism and the parallel path conduction pipe. Through the control of the valve, precise adjustment of the liquid level can be achieved.

[0010] Further, the unpressurized pipeline is a metal or metal composite concrete structure pipeline. The unpressurized pipeline adopts a metal or metal-concrete composite structure, which not only ensures mechanical strength but also adapts to the complex underground environment.

[0011] Further, the camera is provided with a supplementary light source capable of adjusting the light source brightness according to the on-site environment. The supplementary light source can improve the accuracy and precision of shooting.

[0012] Further, a gas leakage critical state identification and early warning mechanism is arranged in the gas recovery mechanism. The gas leakage critical state identification mechanism can trigger an early warning through threshold determination, can quickly respond when the leakage amount exceeds the standard, and avoid safety accidents.

[0013] Based on the above device, the present invention proposes a detection and collection method for SF6 leakage gas in the deep underground GIL power pipe gallery, including: Pass water through the water filling and discharging mechanism into the unpressurized pipeline through the parallel path conduction pipe and the connecting pipes, and submerge the leakage gas escape observation window; Take pictures of the leakage gas escape observation window through a camera to obtain a reference background photo when there is no gas leakage in the SF6 pipeline busbar, a bubble photo of SF6 gas leakage in the SF6 pipeline busbar, and a bubble photo of non-SF6 gas leakage in the SF6 pipeline busbar; Based on the edge recognition algorithm and the deep learning algorithm, use the reference background photo, the bubble photo of SF6 gas leakage, and the bubble photo of non-SF6 gas leakage of the leakage gas escape observation window as the training set for training, and establish a detection model for identifying gas leakage and distinguishing whether it is SF6 gas leakage; During the use of the SF6 pipeline busbar, continuously take pictures of the leakage gas escape observation window through a camera to obtain detection photos; Input the detection photos into the SF6 leakage gas detection model to perform real-time detection on the SF6 pipeline busbar, identify gas leakage, and distinguish whether it is SF6 gas leakage; After detecting SF6 gas leakage, adopt the gas separation method and recover SF6 gas through the gas recovery mechanism.

[0014] Furthermore, when the camera takes pictures, adjust the brightness of the supplementary light source according to the on-site environment.

[0015] Furthermore, in the detection model, distinguish whether it is SF6 gas leakage by the difference in the bubble rising rate.

[0016] Furthermore, the gas leakage critical state recognition and early warning mechanism set in the gas recovery mechanism issues early warning signals including voice signals and image signals when the leakage of SF6 leakage gas exceeds the safety factor range or the set threshold. The gas leakage critical state recognition mechanism can trigger multi-modal early warning through threshold determination. Combined with real-time detection, it can quickly respond when the leakage amount exceeds the standard and avoid safety accidents.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) High detection efficiency: Through the gas escape channel constructed by the non-pressure pipeline and the parallel path conduction pipe, combined with the camera and the leakage gas escape observation window, real-time visual detection of SF6 leakage is achieved; (2) Strong gas collection and leakage control: Adopt the water filling and discharging mechanism to form a non-pressure fully enclosed liquid seal and full immersion environment around the SF6 pipeline busbar, force the leakage gas to gather through the observation window, and cooperate with the gas recovery mechanism to solve the problem of difficult collection of SF6 gas leakage in the deep underground GIL power pipe gallery and reduce environmental pollution; (3) High stability: Through the connected non-pressure pipeline, parallel path conduction pipe, and water filling and discharging mechanism, a non-pressure fully enclosed full immersion environment is formed around the SF6 pipeline busbar, with a simple structure and high stability; (4)High-precision identification: By adopting a detection model based on edge recognition and deep learning, it can distinguish SF6 from non-SF6 gas leakage, significantly improving the detection accuracy and anti-interference ability; (5)Strong adaptability: By combining physical detection of water seal with image recognition to form a dual detection mechanism of "hardware isolation + intelligent analysis", this device and method can be adapted to different environments, providing a technical reference for gas monitoring in similar confined spaces.

[0018] In summary, the present invention can accurately identify minute leaks of SF6 gas inside the GIL power pipe gallery in the outer shell and connecting components with high precision. Through a non-pressure pipeline and a parallel-path conduction pipe, it can collect distributed minute leakage insulating gas of long-distance GIL with a very high proportion (96%) without discharging it into the indoor air of the pipe gallery. The present invention can achieve high-precision monitoring of minute leaks of high-voltage insulating gas inside the GIL power pipe gallery with a long-distance and fully enclosed metal shell, and can almost completely recover the leaked gas, thus changing the current situation that it is difficult to detect, monitor, and recover the leakage of SF6 gas with internal pressure in long-distance GIL in deep underground power pipe galleries, greatly improving the safety and reliability of long-distance GIL in this power pipe gallery, and making it possible to safely and reliably transport large-capacity electricity by using high-voltage SF6 pipeline buses in deep underground (burial depth greater than 100m) and ultra-long distance (greater than 10km) where it is difficult to ventilate and replace air. The present invention realizes the full-process control of SF6 gas leakage in the deep underground GIL power pipe gallery, featuring accurate monitoring, timely recovery, and intelligent operation and maintenance. Description of the Drawings

[0019] Figure 1 It is a schematic cross-sectional view of the detection and collection device for single-phase coaxial GIL.

[0020] Figure 2 It is a schematic side view of the detection and collection device for single-phase coaxial GIL.

[0021] Figure 3 It is a schematic cross-sectional view of the detection and collection device for three-phase coaxial GIL.

[0022] Description of the reference numerals: 1 - non-pressure pipeline; 1A - support member; 2 - SF6 pipeline bus; 3 - parallel-path conduction pipe; 4 - observation window for leakage gas escape; 5 - camera; 6 - gas recovery mechanism; 7 - water filling and discharging mechanism; 8 - connecting pipe. Detailed Embodiment

[0023] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present application clearer, the following further details the present application with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] The SF6 pipe bus 2, generally a high-voltage SF6 pipe bus (GIL) with a voltage of 110 kV - 1000 kV, is a power high-voltage transmission device. It adopts a fully welded metal shell, and the internal conductor is supported on the shell by supports or pot insulators with gas separation functions. The inside is filled with 0.2 Mpa - 0.8 Mpa of SF6 insulating gas. Among them, the 550 kV high-voltage SF6 pipe bus is usually filled with 0.5 Mpa of SF6 insulating gas.

[0025] As Figure 1 、 Figure 2 and Figure 3 shown, the detection and collection device for SF6 leakage gas in the deep underground GIL power pipe gallery is arranged outside the SF6 pipe bus 2. An unpressurized pipe 1 is arranged around the outside of the SF6 pipe bus 2; a parallel path conduction pipe 3 is arranged on the upper part of the unpressurized pipe 1. The parallel path conduction pipe 3 can be a common water gas steel pipe or a PVC material water pipe; the unpressurized pipe 1 and the parallel path conduction pipe 3 are connected by multiple connecting pipes 8. A leakage gas escape observation window 4 is arranged on the connecting pipe 8, and a camera 5 is arranged outside the leakage gas escape observation window 4. The upper part of the parallel path conduction pipe 3 is connected to a water filling and discharging mechanism 7, and the side of the parallel path conduction pipe 3 is connected to a gas recovery mechanism 6.

[0026] The number of the connecting pipes 8 and the leakage gas escape observation windows 4 matches the chamber length of the SF6 pipe bus 2. When the chamber length of the SF6 pipe bus 2 is short, such as dozens of meters, it can be the same as the number of chambers. When the chamber length of the SF6 pipe bus 2 is long, such as hundreds of meters, multiple connecting pipes 8 and leakage gas escape observation windows 4 can be arranged at equal intervals, and specifically, it can be set according to the monitoring density and the capacity of the gas recovery mechanism 6.

[0027] Supporting rods 1A are arranged on the outer wall of the SF6 pipe bus 2. Specifically, as Figure 1 and Figure 2 shown, when the SF6 pipe bus 2 is single-phase, both ends of the supporting rod 1A are connected to the outer wall of the SF6 pipe bus 2 and the inner wall of the unpressurized pipe 1; as Figure 3 shown, when the SF6 pipe bus 2 is three-phase, both ends of the supporting rod 1A are connected to the outer walls of two adjacent SF6 pipe buses 2.

[0028] Specifically, as Figure 2 shown, a valve is arranged on the connecting pipe between the water filling and discharging mechanism 7 and the parallel path conduction pipe 3.

[0029] The unpressurized pipe 1 can be a metal or metal composite concrete structure pipe, which can achieve long-distance interconnection. The pipe has a certain rigidity and strength, and can meet the fixed support force requirements and strength requirements of the SF6 pipe bus 2 inside the unpressurized pipe 1.

[0030] The camera 5 is provided with a supplementary light source which can adjust the brightness of the light source according to the on-site environment. The gas recovery mechanism 6 is provided with a gas leakage critical state identification and early warning mechanism.

[0031] Based on the above device, the detection and collection method of SF6 gas leakage in deep underground GIL power pipeline gallery includes: The water is fed into the pressure-free pipe 1 through the parallel path conducting pipe 3 and the connecting pipe 8 by the water filling and discharging mechanism 7, and the leaking gas escape observation window 4 is submerged; The camera 5 is used to photograph the leaking gas escape observation window 4 to obtain a reference background photo when no gas leakage occurs in the SF6 pipeline bus 2, a bubble photo of SF6 gas leakage in the SF6 pipeline bus 2, and a bubble photo of non-SF6 gas leakage in the SF6 pipeline bus 2; Based on the edge recognition algorithm and the deep learning algorithm, the reference background photos of the leaking gas escape observation window 4, the photos of bubbles of SF6 gas leakage, and the photos of bubbles of non-SF6 gas leakage are used as training sets to establish a detection model for identifying gas leakage and distinguishing whether it is SF6 gas leakage; During the use of the SF6 pipeline busbar 2, the leaking gas escape observation window 4 is continuously photographed by the camera 5 to obtain detection photos; Input the detection photos into the SF6 gas leakage detection model, perform real-time detection on the SF6 pipeline bus 2, identify gas leakage, and distinguish whether it is SF6 gas leakage; When SF6 gas leakage is detected, a gas separation method is adopted to recover the SF6 gas through the gas recovery mechanism 6.

[0032] Specifically, when the camera 5 is shooting, the brightness of the fill light source is adjusted according to the scene environment.

[0033] Specifically, in the detection model, whether there is SF6 gas leakage is distinguished by the difference in bubble rising rate.

[0034] Specifically, the gas leakage critical state identification and early warning mechanism set in the gas recovery mechanism 6 sends out early warning signals including voice signals and image signals when the SF6 leakage gas exceeds the safety factor range or the set threshold. More specifically, there are three levels of alarms according to the bubble leakage situation, namely, mild leakage, moderate leakage and severe leakage. In the case of mild leakage, a low-frequency prompt sound is emitted and a blue area is displayed at the identified leakage point. In the case of moderate leakage, a medium-frequency prompt sound is emitted and a yellow area is displayed at the identified leakage point. In the case of severe leakage, a high-frequency prompt sound is emitted and a red area is displayed at the identified leakage point.

[0035] In addition, the image acquisition card can be used to collect and pre-process the images acquired by the camera 5. The data interface determines the transmission bandwidth according to the resolution and frame rate. The USB3.0, Camera Link or GigE interface can be selected in combination with the transmission distance. The power supply is set to realize the operation of the device and the detection of gas leakage. Example

[0036] Take the 20km long-distance transmission of a high-voltage SF6 pipeline busbar (GIL) with a rated voltage of 550kV and a rated current of 6000A in a large underground hydropower station as an example. The single-phase shell of the 550kV GIL is an aluminum tube with an outer diameter of 500mm and a thickness of 8mm, the conductor is a pure aluminum tube with an outer diameter of 160mm and a thickness of 15mm, and the internal SF6 pressure is 0.5Mpa. The length of GIL is 10km-50km, all located in the deep underground power pipeline gallery. GIL is a three-phase phase split mode. This embodiment uses one of the phases to illustrate the detection and collection device and method of the present invention.

[0037] In this embodiment, the air chamber length of the GIL is set to 100m, and the single-phase GIL shell is supported on the inner wall of the pressure-free pipe 1 by four supporting rods 1A. An observable leakage gas escape observation window 4 is provided above the pressure-free pipe 1. In this embodiment, the distribution spacing of the leakage gas escape observation window 4 is set according to 1 / n (n=2) of the air chamber length, that is, a leakage gas escape observation window 4 is provided every 50m.

[0038] Above the leaking gas escape observation window 4, a parallel path conducting pipe 3 is provided that passes through the GIL path direction. The pipe diameter is considered based on the maximum gas volume of a single gas chamber under normal conditions (annual leakage rate <1%) and under fault conditions, and the full immersion filling and draining requirements are also considered. In this embodiment, the outer diameter is 30mm-50mm. The pressure-free pipeline 1, the parallel path conducting pipe 3 and the gas recovery mechanism 6 are connected, wherein the pressure-free pipeline 1 is provided every 2000m in this embodiment, and the gas recovery mechanism 6 is provided every 1000m. The gas recovery mechanism 6 has drying, stratification, isolation and compression functions.

[0039] A camera 5 with its own light source is provided outside the leaking gas escape observation window 4. This embodiment adopts a high-resolution, high-precision area array camera with a resolution of 1920 pixels × 1080 pixels, and cooperates with the dedicated light source of the equipment to identify bubbles in the leaking gas escape observation window 4.

[0040] The detection and collection methods are as follows: First, the pressureless pipeline 1 is filled with water through the water filling and draining mechanism 7 until the water level exceeds the upper position of the leakage gas escape observation window 4, that is, full immersion of the GIL is achieved. When there is SF6 gas leakage in the GIL, since SF6 gas is hardly soluble in water, even a tiny amount of leakage will generate bubbles. In the case of an external parallel conduction pipe with air, the bubbles will choose the nearest path to escape, that is, enter the parallel path conduction pipe 3 through the nearest leakage gas escape observation window 4. When the SF6 gas passes through the leakage gas escape observation window 4, the detection model is used to identify the bubbles generated by the tiny leakage of the GIL shell, and the SF6 gas molecules are distinguished and discovered through discrimination. Finally, the leakage gas is recovered through the parallel path conduction pipe 3 and the gas recovery mechanism 6, so as to realize the detection and discovery of the micro-leakage of the GIL device and the lossless recovery.

[0041] Based on the edge recognition algorithm and the deep learning algorithm, various other types of bubbles caused by non-SF6 leakage reasons, such as bubbles caused by vibration and small bubbles caused by tiny impurities in water, can be distinguished from the leakage SF6 bubbles through comparative analysis and deep learning, avoiding false alarms and misjudgments, and corresponding state forecasts and early warnings can be issued.

[0042] The specific principle of distinguishing SF6 gas is as follows: Since the density of SF6 gas is 5 times that of air density under the same temperature and water pressure, when bubbles of the same outer diameter pass through the leakage gas escape observation window 4, the time and rate of the same rising stroke are different. Based on this principle, by calibrating the rising rate template of bubbles of the same size, SF6 gas and non-SF6 gas, such as air, can be distinguished.

[0043] The gas recovery mechanism 6 is equipped with an exhaust fan motor, a centrifugal separation pump, a compression motor, and a gas leakage critical state recognition and early warning mechanism, etc. One is set every 1000m section in this embodiment. When a certain amount of SF6 gas leakage is recognized, the device is started to recover the SF6 gas in the parallel path conduction pipe 3 in sections. When there is a large amount of gas leakage, the leakage area can also be recognized in time, and the gas recovery mechanism 6 can be quickly started to completely recover the SF6, and no SF6 escapes outside the device, avoiding the entry of SF6 gas into the deep underground power pipe gallery. Thus, the underground long-distance power pipe gallery does not need to set up an exhaust and ventilation system with huge power capacity requirements, preventing the accumulation of SF6 leakage in the pipe gallery and ensuring the safety of personnel.

[0044] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A detection and collection device for SF6 leakage gas in a deep underground GIL power pipe gallery, which is arranged outside the SF6 pipeline busbar (2), and is characterized in that: An unpressurized pipe (1) is disposed around the outside of the SF6 pipe busbar (2). A parallel path conduction pipe (3) is provided at the upper part of the unpressurized pipe (1). The unpressurized pipe (1) and the parallel path conduction pipe (3) are connected through a plurality of communication pipes (8). A leakage gas escape observation window (4) is provided on the communication pipe (8). A camera (5) is provided outside the leakage gas escape observation window (4). A water filling and discharging mechanism (7) is connected to the upper part of the parallel path conduction pipe (3). A gas recovery mechanism (6) is connected to the side of the parallel path conduction pipe (3).

2. The detection and collection device for SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 1, wherein: Supporting members (1A) are provided on the outer wall of the SF6 pipe busbar (2). When the SF6 pipe busbar (2) is single-phase, the two ends of the supporting member (1A) are connected to the outer wall of the SF6 pipe busbar (2) and the inner wall of the unpressurized pipe (1). When the SF6 pipe busbar (2) is three-phase, the two ends of the supporting member (1A) are connected to the outer walls of two adjacent SF6 pipe busbars (2).

3. The detection and collection device for SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 1, characterized in that: A valve is provided on the communication pipe between the water filling and discharging mechanism (7) and the parallel path conduction pipe (3).

4. The detection and collection device for SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 1, characterized in that: The unpressurized pipe (1) is a metal or metal composite concrete structure pipe.

5. The detection and collection device for SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 1, characterized in that: The camera (5) is provided with a supplementary light source capable of adjusting the light source brightness according to the on-site environment.

6. The detection and collection device for SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 1, characterized in that: A gas leakage critical state identification and early warning mechanism is provided in the gas recovery mechanism (6).

7. A method for detecting and collecting SF6 leakage gas in a deep underground GIL power pipe gallery using the device according to any one of claims 1-6, characterized in that, Including: Water is introduced into the unpressurized pipe (1) through the water filling and discharging mechanism (7), the parallel path conduction pipe (3) and the communication pipe (8) to submerge the leakage gas escape observation window (4). The leakage gas escape observation window (4) is photographed by the camera (5) to obtain a reference background photo when the SF6 pipe busbar (2) does not have gas leakage, a bubble photo of SF6 gas leakage of the SF6 pipe busbar (2), and a bubble photo of non-SF6 gas leakage of the SF6 pipe busbar (2). Based on the edge recognition algorithm and the deep learning algorithm, the reference background photo, the bubble photo of SF6 gas leakage, and the bubble photo of non-SF6 gas leakage of the leakage gas escape observation window (4) are used as a training set for training to establish a detection model for identifying gas leakage and distinguishing whether it is SF6 gas leakage. During the use of the SF6 pipe busbar (2), the leakage gas escape observation window (4) is continuously photographed by the camera (5) to obtain detection photos. The detection photos are input into the SF6 leakage gas detection model to perform real-time detection on the SF6 pipe busbar (2), identify gas leakage, and distinguish whether it is SF6 gas leakage. When SF6 gas leakage is detected, the gas separation method is adopted, and the SF6 gas is recovered through the gas recovery mechanism (6).

8. The detection and collection method of SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 7, characterized in that: When the camera (5) takes a photo, the brightness of the supplementary light source is adjusted according to the on-site environment.

9. The detection and collection method of SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 7, characterized in that: In the detection model, whether it is SF6 gas leakage is distinguished by the difference in the bubble rising rate.

10. The method for detecting and collecting SF6 leakage gas in the deep underground GIL power pipe gallery according to claim 7, characterized in that: The gas leakage critical state identification and warning mechanism provided by the gas recovery mechanism (6) issues a warning signal including voice signals and image signals when the leakage of SF6 leakage gas exceeds the safety factor range or the set threshold value.

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