A mixed gas supply station system for GIS

Abstract

This invention relates to the field of mixed gas recovery and circulation supply technology in GIS products, specifically to a mixed gas supply station system for GIS. The mixed gas supply station system for GIS includes a workstation, a mixed gas recovery system, a gas storage tank, and a mixed gas purification system connected in sequence. The mixed gas purification system is connected to the workstation for circulation recovery and purification operations. A mixed gas separation system is also connected to the gas storage tank or a pipe connected to the outlet of the gas storage tank. The mixed gas separation system is used to separate SF6 from the mixed gas flowing out of the gas storage tank. A liquid storage tank is connected downstream of the mixed gas separation system. The liquid storage tank is equipped with a refrigeration device to convert the separated SF6 gas into liquid and store it in the liquid storage tank. Alternatively, a refrigeration device and a liquid storage tank are connected downstream of the mixed gas separation system in sequence. The refrigeration device is used to convert the separated SF6 gas into liquid, and the liquid storage tank is used to store liquid SF6.

Description

Technical Field

[0001] This invention relates to the field of mixed gas recovery and circulation supply technology in GIS products, and specifically to a mixed gas supply station system for GIS. Background Technology

[0002] With the increasing scale of my country's power grid and the continuous increase in the use of GIS equipment, the consumption of SF6 / N2 mixed gas has risen sharply. While vigorously promoting the use of SF6 / N2 mixed gas GIS equipment, how to properly handle the circulation and recovery of SF6 / N2 gas and prevent the mixed gas from polluting the environment has become a problem that enterprises producing and using GIS equipment need to face and solve.

[0003] like Figure 1 As shown, gas recovery of conventional GIS equipment is carried out through workstation 4 in production workshop 2. Multiple workstations 4 are arranged in production workshop 2. Each workstation 4 is connected to GIS product 1 through a recovery pipeline, which can recover gas from GIS product 1. At the same time, there are also gas filling pipelines and vacuuming pipelines between workstation 4 and GIS product to realize gas recovery and reverse filling between workstation 4 and GIS product. Next to the production workshop 2, there is a gas station main unit room 3. The gas station main unit room 3 is equipped with a mixed gas recovery system 8 connected to the workstation 4 via a gas transmission pipeline 21. The mixed gas recovery system 8 is used to recover the mixed gas in the workstation 4. After pressurizing the recovered mixed gas, the mixed gas recovery system 8 transmits the gas to the downstream connected gas storage tank 81. The gas outlet of the gas storage tank 81 is connected to a mixed gas purification system 12 via a pipeline. The mixed gas purification system 12 can purify, filter and depressurize the mixed gas in the gas storage tank 81. The gas outlet of the mixed gas purification system 12 is connected back to the workstation 4 in the production workshop 2 via a return gas pipeline 22 to realize the recovery and recycling of the mixed gas. Finally, the depressurized and purified mixed gas can be sent back to the workstation 4. The workstation 4 is also equipped with a waste discharge pipeline 23 for discharging the vacuum exhaust gas.

[0004] However Figure 1The problem with gas circulation systems is that, because gas recovery and external filling are continuous processes, the storage tank needs to continuously store the high-pressure mixed gas being externally filled and recovered, and the storage capacity cannot be exceeded. However, the mixed gas purification system needs to complete multiple steps such as purification, filtration, and depressurization of the high-pressure mixed gas. Its processing speed is much slower than the gas collection speed of the storage tank. Therefore, the high-pressure mixed gas in the storage tank often exceeds its storage limit, causing gas leakage and environmental pollution. To avoid this, the conventional approach is simply to increase the number of storage tanks at the outlet of the mixed gas recovery system. This approach not only occupies a lot of space but also only alleviates the problem of insufficient high-pressure mixed gas storage space. It also increases the difficulty of safety management for users and cannot completely solve the problem of high-pressure mixed gas overpressure storage, resulting in mixed gas release, leakage, and pollution. Summary of the Invention

[0005] The purpose of this invention is to provide a mixed gas supply station system for GIS, in order to solve the technical problems in the prior art where gas exceeding the storage limit of the gas storage tank needs to be collected by an additional gas storage tank, which leads to increased space occupation, increased difficulty in safety management, and the gas is still prone to leakage, causing environmental pollution.

[0006] To achieve the above objectives, the technical solution of the GIS mixed gas supply station system provided by the present invention is as follows:

[0007] A mixed gas supply station system for GIS includes a workstation, a mixed gas recovery system, a gas storage tank, and a mixed gas purification system connected in sequence. The mixed gas purification system is connected to the workstation for cyclic recovery and purification operations. A mixed gas separation system is also connected to the gas storage tank or a pipeline connected to the gas outlet of the gas storage tank. The mixed gas separation system is used to separate SF6 from the mixed gas flowing out of the gas storage tank. A liquid storage tank is connected downstream of the mixed gas separation system. The liquid storage tank is equipped with a refrigeration device to convert the separated SF6 gas into liquid and store it in the liquid storage tank. Alternatively, a refrigeration device and a liquid storage tank are connected in sequence downstream of the mixed gas separation system. The refrigeration device is used to convert the separated SF6 gas into liquid, and the liquid storage tank is used to store liquid SF6.

[0008] Beneficial Effects: In existing technologies, experiments and research have shown that high-temperature, high-pressure mixed gases are difficult to store. Therefore, mixed gases in conventional storage tanks are prone to leakage when storage limits are exceeded, causing pollution. However, by separating the mixed gases and then depressurizing the resulting SF6 gas at low temperatures to liquefy it, the high-temperature, high-pressure gas is transformed into low-temperature, low-pressure liquid SF6, which can then settle at the bottom of the storage tank for easy storage. This not only achieves the effect of SF6 purification but also prevents SF6 gas leakage, protecting the environment. Therefore, this invention improves the circulation pipeline based on the existing mixed gas recycling process in the storage tank. Alternatively, a mixed gas separation system can be installed on the pipeline connected to the gas outlet of the gas storage tank to separate the high-temperature and high-pressure mixed gas in the gas storage tank when it exceeds the storage limit. A liquid storage tank is connected downstream of the mixed gas separation system, and the separated SF6 gas is converted into liquid for storage through a refrigeration device. This effectively prevents the leakage of mixed gas, especially SF6 gas, which is convenient for storage and protects the environment. There is no need to increase the number of gas storage tanks when the mixed gas exceeds the standard. The space occupied is fixed, which effectively solves the technical problem in the existing technology that the excessive gas needs to be collected by extra gas storage tanks, which leads to an increase in space occupation but the gas is still easy to leak and cause environmental pollution.

[0009] Preferably, a heating system is connected downstream of the liquid storage tank, and a gas mixing system is connected downstream of the heating system. The gas mixing system is connected to the gas inlet of the storage tank via a connecting pipe. Through the heating system and the gas mixing system, the liquid SF6 in the storage tank can be reheated and vaporized, and the gas mixing system can be used to regenerate the mixed gas, achieving a cyclical process of gas recovery, storage, and reuse.

[0010] Preferably, the gas mixing system is further connected to a manifold, which is connected upstream of the gas mixing system via a pipe, for supplying insulating gases of different components. Different insulating gases can be added to the SF6 gas mixture through the manifold, resulting in a new gas mixture.

[0011] Preferably, multiple gas supply cylinders are connected to the manifold. These multiple cylinders ensure a sufficient supply of insulating gas for the new components, allowing for rapid supply of different mixed gases.

[0012] Preferably, a proportional valve is also provided on the manifold or the connecting pipe between the manifold and the mixed gas system. The proportional valve can be used to adjust the proportion of insulating gas in the manifold, and the amount and components of the mixed gas can be adjusted and mixed to obtain mixed gases of different concentrations and ratios, which facilitates the reuse of the mixed gas.

[0013] Preferably, a buffer tank is provided between the gas mixing system and the heating system for buffering and collecting the SF6 gas heated by the heating system. By collecting and buffering the SF6 gas heated by the heating system through the buffer tank, the SF6 gas has a buffer space for recollection and storage, which is beneficial for the mixing and supply of subsequent gas mixtures.

[0014] Preferably, the buffer tank is equipped with a proportional valve for adjusting the proportion of gas entering the mixed gas system from the buffer tank. The proportional valve on the gas storage tank can also adjust the proportion of SF6 gas entering the mixed gas system, facilitating subsequent control of the mixed gas concentration.

[0015] Preferably, a self-regulating valve is installed on the pipeline between the gas separation system and the outlet of the gas storage tank. This valve opens when the pressure in the pipeline exceeds a set value to connect the gas separation system and the gas storage tank, and closes when the pressure falls below the set value to disconnect them. This self-regulating valve allows the gas separation system to automatically connect and separate the gas mixture within the gas storage tank, or to disconnect the system, facilitating independent use and automatic control of the gas separation system.

[0016] Preferably, at least two gas storage tanks are provided, and each gas storage tank is connected to the mixed gas separation system through an independent connecting pipe. Having at least two gas storage tanks ensures the recovery of the mixed gas, and the independent connecting pipes between each tank and the mixed gas separation system allow each tank to independently supply gas to the system, minimizing cross-contamination. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an existing mixed gas supply station system in the background art;

[0018] Figure 2 This is a schematic diagram of the GIS mixed gas supply station system in Embodiment 1 provided by the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. GIS products; 2. Production workshop; 3. Gas station main unit building; 4. Workstation; 5. Pressure stabilizing tank; 6. Pressure sensor; 7. Manual ball valve; 8. Mixed gas recovery system; 81. Mixed gas storage tank; 9. Group A storage tank; 10. Group B storage tank; 11. Automatic control valve; 12. Mixed gas purification system; 13. Mixed gas separation system; 14. Liquid storage tank; 15. Emptying tank; 16. Heating system; 17. Buffer tank; 18. Mixed gas mixing system; 19. Manifold; 20. Control unit; 21. Gas transmission pipeline; 22. Return gas pipeline; 23. Waste discharge pipeline; 24. Pressure reducer; 25. Refrigeration unit. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to embodiments.

[0022] Specific embodiment 1 of the GIS mixed gas supply station system provided by the present invention:

[0023] The GIS mixed gas supply station system in this embodiment includes a production workshop 2 workstation 4 connected to a conventional GIS product 1, and a gas station main unit 3 connected to the production workshop 2 workstation 4. The gas station main unit 3 is equipped with a connecting pipeline unit connected to the workstation 4. Through the pipelines in the connecting pipeline unit, a mixed gas recovery system 8, a gas storage tank, and a mixed gas purification system 12 are sequentially connected to the workstation 4. The mixed gas purification system 12 is connected to the workstation 4 for cyclic recovery and purification operations. The GIS mixed gas supply station system integrates existing functions such as mixed gas recovery and gaseous storage. In addition, it adds functions such as mixed gas separation, separate liquefaction and storage of SF6 gas, SF6 liquid vaporization, SF6 gas purification and remixing and precise proportioning, and SF6 / N2 mixed gas refilling. Under the overall control of the centralized gas supply station system control host 20 in the gas station main unit 3, the system completes the recovery and cyclic supply of mixed gas on the GIS equipment. This prevents the technical problems of large footprint and easy gas leakage and environmental pollution caused by adding gas storage tanks when the gas in the storage tank exceeds the standard.

[0024] Specifically, such as Figure 2As shown, similar to existing technologies, gas recovery is carried out through workstations 4 within the production workshop 2. Multiple workstations 4 are arranged within the production workshop 2, each connected to the GIS product 1 via a recovery pipeline. These workstations 4 can recover gas from the GIS product 1. A gas filling pipeline and a vacuuming pipeline also connect the workstations 4 and the GIS product 1, enabling gas recovery and reverse filling between them. A gas station main unit room 3 is located beside the production workshop 2. The gas station main unit room 3 contains a mixed gas recovery system 8 connected to the workstations 4 via a gas transmission pipeline 21. The mixed gas recovery system 8 pressurizes the recovered mixed gas and transmits it to a downstream gas storage tank. The outlet of the gas storage tank is connected to a mixed gas purification system 12 via a pipeline. The outlet of the mixed gas purification system 12 is connected back to the workstations 4 in the production workshop 2 via a return gas pipeline 22, achieving the recycling and circulation of the mixed gas. Finally, the depressurized and purified mixed gas is returned to the workstations 4. The workstations 4 are also equipped with a waste discharge pipeline 23 for discharging vacuum exhaust gas. The gas pipeline 21 is connected to the mixed gas recovery system 8, which is a pressure stabilizing tank 5. The pressure stabilizing tank 5 can temporarily store the gas flowing out of the workstation 4. When the gas stored in the pressure stabilizing tank 5 exceeds the set value, the temporarily stored gas is transported to the mixed gas recovery system 8, which recovers and pressurizes the gas in the pressure stabilizing tank 5.

[0025] like Figure 2 As shown, the output of the mixed gas recovery system 8 is connected to two sets of gas storage tanks, A and B. The high-pressure mixed gas recovered by the mixed gas recovery system 8 is stored in gas storage tanks A (9) and B (10). In this embodiment, both the pressure stabilizing tank 5 and the gas storage tanks are equipped with pressure sensors 6, and control valves are installed on the pipes where their respective inlets or outlets are located. The pressure sensors 6 measure the gas pressure inside the tanks in real time, thereby transmitting the measurement information to the central gas supply station system control host 20 in a timely manner to control the opening and closing of the control valves. When the gas pressure in gas storage tank A (9) is lower than the set value, the gas is preferentially stored in gas storage tank A (9); otherwise, the mixed gas is stored in gas storage tank B (10). When the gas pressure in pressure stabilizing tank 5 is lower than the set value, the mixed gas recovery system 8 automatically stops.

[0026] like Figure 2 As shown, when the mixed gas recovery system 8 is started, the mixed gas flows from the pressure stabilizing tank 5 into the mixed gas recovery system 8 and then into the gas storage tank. At the same time, the mixed gas purification system 12 is started. The mixed gas passes through the system for drying, adsorption, filtration and pressure reduction, flows out of the mixed gas purification system 12 and returns to the workstation 4.

[0027] like Figure 2As shown, a mixed gas separation system 13 is connected to the pipes connected to the gas outlets of the two gas storage tanks A and B. The mixed gas separation system 13 and the mixed gas purification system 12 are arranged in parallel. The mixed gas separation system 13 is used to separate SF6 from the mixed gas flowing out of the gas storage tank. A liquid storage tank 14 is connected downstream of the mixed gas separation system 13. A refrigeration device 25 is installed on the liquid storage tank 14 to convert the separated SF6 gas into liquid and store it in the liquid storage tank 14. A mixed gas mixing system 18 is also connected downstream of the mixed gas separation system 13. The gas outlet of the mixed gas mixing system 18 is connected in series with the gas outlet of the mixed gas recovery system 8 to realize the liquefaction and collection of the SF6 gas after the mixed gas separation for reheating and mixed gas supply.

[0028] In this embodiment, a self-regulating valve 11 is installed on the pipeline between the mixed gas separation system 13 and the gas storage tank outlet. The self-regulating valve 11 is used to open when the pressure in the pipeline is greater than a set value to connect the mixed gas separation system 13 and the gas storage tank, and to close when the pressure is less than the set value to disconnect the mixed gas separation system 13 and the gas storage tank. A pressure reducer 24 is also connected to the rear end of the self-regulating valve 11 to ensure pipeline safety. When the gas pressure in both A and B group gas storage tanks reaches the set value, and there is still mixed gas being recovered, the mixed gas separation system 13 remains connected, the self-regulating valve 11 connected to the rear end of B group gas storage tank 10 opens, and the mixed gas enters the mixed gas separation system 13 through the self-regulating valve 11. The mixed gas separation system 13 begins to separate excess SF6 / N2 mixed gas, stores the separated SF6 gas in the liquid storage tank 14 for liquefaction storage, and directly vents the separated N2 gas. When the pressure in B group gas storage tank 10 drops to the set value, the self-regulating valve 11 connected to its rear end closes, and the mixed gas separation system 13 automatically stops. In this embodiment, the self-controlled valve 11 is an electric ball valve installed on the connecting pipeline. The electric ball valve includes a switch valve core and a pressure sensor 6 connected to the switch valve core. The pressure sensor 6 is used to sense the air pressure in the pipeline in real time, so as to control the switch valve core to open or close in a timely manner.

[0029] like Figure 1As shown, the storage tank 14 is used for cold storage of SF6 gas separated by the mixed gas separation system 13. The storage tank 14 is equipped with a refrigeration device 25, which cools the storage tank 14, promoting SF6 gas liquefaction. When the mixed gas separation system 13 is started, the refrigeration device 25 on the storage tank 14 is also activated. SF6 gas enters the storage tank 14, is liquefied by the refrigeration, and settles at the bottom of the storage tank 14. The liquid level is displayed by a level gauge. For residual N2 gas that is not separated by the mixed gas separation system 13, because it is not easily liquefied, a small amount of N2 gas is suspended and accumulates at the top of the storage tank 14. This portion of N2 gas is discharged outdoors using the venting tank 15, thereby achieving the effect of purifying SF6 liquid. The level gauge in the storage tank 14 is equipped with maximum and minimum liquid level sensors, transmitting liquid level change information to the central gas supply station system control host 20. When the liquid level in the tank is above the minimum level, the electric ball valve at the outlet opens; otherwise, it closes. If the liquid level in the tank is above the maximum level, the centralized gas supply station system will trigger an audible and visual alarm and stop operation. When the gas separation system 13 stops, the refrigeration unit 25 on the storage tank 14 will also stop.

[0030] like Figure 2 As shown, in this embodiment, a heating system 16 is connected downstream of the storage tank 14. The downstream of the heating system 16 is connected upstream of the mixed gas mixing system 18, thereby replenishing the mixed gas mixing system 18 with SF6 gas through the heating system 16. The mixed gas mixing system 18 also includes a manifold 19, which is connected upstream of the mixed gas mixing system 18 via a pipeline, and is used to supply insulating gases of different components. Multiple gas supply cylinders are connected to the manifold 19, and each gas supply cylinder can independently supply insulating gas. In this embodiment, to collect and buffer the SF6 gas collected after heating in the heating system 16, a buffer tank 17 is also provided between the heating system 16 and the mixed gas mixing system 18. The buffer tank 17 and the manifold 19 are connected in parallel upstream of the mixed gas mixing system 18, thereby enabling the simultaneous replenishment of the mixed gas mixing system 18 with gases of different components and concentrations.

[0031] In this embodiment, the buffer tank 17 is equipped with a proportional valve for adjusting the proportion of gas entering the mixed gas system 18 from the buffer tank 17. A proportional valve is also provided on the connecting pipe between the manifold 19 and the mixed gas system 18. By setting these two proportional valves, the concentration ratios of both the SF6 gas and the insulating gas in the manifold 19 can be adjusted to obtain mixed gases with different proportions. Figure 2As shown, when the gas pressure in both A and B group gas storage tanks is lower than the set value, the gas mixing system 18 is started. SF6 gas in buffer tank 17 and N2 gas in manifold 19 enter the system and quickly mix according to the set SF6 / N2 ratio. The mixed gas is then replenished to A and B group gas storage tanks in sequence. When the pressure in the tanks reaches the replenishment set value, the gas mixing system 18 automatically stops.

[0032] The GIS mixed gas supply station system in this embodiment improves the circulation pipeline based on the existing mixed gas recycling process. A mixed gas separation system 13 is installed on the pipeline connected to the gas storage tank or the gas outlet of the gas storage tank to separate the high-temperature and high-pressure mixed gas in the gas storage tank when it exceeds the storage limit. A liquid storage tank 14 is connected downstream of the mixed gas separation system 13. The separated SF6 gas is converted into liquid and stored by a refrigeration device 25. This effectively prevents the leakage of mixed gas, especially SF6 gas, and facilitates storage while protecting the environment. It eliminates the need to increase the number of gas storage tanks when the mixed gas exceeds the standard, and the space occupied is fixed. It effectively solves the technical problem in the prior art that the excessive mixed gas needs to be collected by extra gas storage tanks, which increases the space occupation and the difficulty of safety management, but the gas is still easy to leak and cause environmental pollution.

[0033] Specific embodiment 2 of the GIS mixed gas supply station system provided by the present invention:

[0034] In this invention, excess mixed gas in the storage tank can be separated and collected in different ways. The difference from Embodiment 1 is that in this embodiment, the storage tank is not connected to a heating system; the storage tank only performs liquefaction collection and storage of SF6 gas after separation. In other embodiments, the mixed gas mixing system may not be connected to the storage tank, but rather be a separate system component located downstream of the heating system. Alternatively, the mixed gas supply station system in this embodiment may only separate and collect the gas through the storage tank and the mixed gas separation system, without requiring a separate mixed gas mixing system.

[0035] Specific embodiment 3 of the GIS mixed gas supply station system provided by the present invention:

[0036] In this invention, the structure of the manifold can also be modified. The difference from Embodiment 1 is that in this embodiment, the manifold can be a ventilation pipe or an insulating gas storage tank, and the number of gas cylinders installed within it can also be changed. In other embodiments, the gas cylinders on the manifold are filled according to a concentration ratio, and the proportional valve can be omitted or replaced with a regular valve.

[0037] Specific embodiment 4 of the GIS mixed gas supply station system provided by the present invention:

[0038] In this invention, the position of the gas storage tank and the proportional valve installed on it can be changed. The difference from Embodiment 1 is that in this embodiment, the buffer tank can be located downstream of the manifold, or it can be omitted, and the heating system and the mixed gas system can be directly connected. In other embodiments, the proportional valve can also be directly installed on the outlet of the buffer tank.

[0039] Specific embodiment 5 of the GIS mixed gas supply station system provided by the present invention:

[0040] In this invention, the structure of the self-regulating valve can be different. The difference from Embodiment 1 is that in this embodiment, the self-regulating valve can be a manual ball valve. The self-regulating valve can also be a butterfly valve, gate valve, or other different types of valve structures.

[0041] Specific embodiment 6 of the GIS mixed gas supply station system provided by the present invention:

[0042] In this invention, the number of gas storage tanks can be changed. The difference from Embodiment 1 is that in this embodiment, there is only one gas storage tank. In other embodiments, the number of gas storage tanks can be changed, but in order to reduce the footprint and weight, the size of the gas storage tanks can be reduced, but it is necessary to ensure that each gas storage tank is connected to the mixed gas separation system.

[0043] Specific embodiment 7 of the GIS mixed gas supply station system provided by the present invention:

[0044] In this invention, the position of the refrigeration device can be changed. The difference from Embodiment 1 is that in this embodiment, a refrigeration device and a liquid storage tank are connected downstream of the mixed gas separation system in sequence. The refrigeration device is used to convert the separated SF6 gas into liquid, and the liquid storage tank is used to store liquid SF6.

[0045] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixed gas supply station system for GIS, comprising a workstation (4), a mixed gas recovery system (8), a gas storage tank, and a mixed gas purification system (12) connected in sequence, wherein the mixed gas purification system is connected to the workstation for cyclic recovery and purification operations, characterized in that, A mixed gas separation system (13) is also connected to the pipe connected to the gas storage tank or the gas outlet of the gas storage tank. The mixed gas separation system (13) is used to separate the SF6 gas in the mixed gas flowing out of the gas storage tank. A liquid storage tank (14) is connected downstream of the mixed gas separation system (13). A refrigeration device (25) is provided on the liquid storage tank to convert the separated SF6 gas into liquid and store it in the liquid storage tank. Alternatively, a refrigeration device (25) and a liquid storage tank (14) are connected downstream of the mixed gas separation system (13) in sequence. The refrigeration device (25) is used to convert the separated SF6 gas into liquid, and the liquid storage tank (14) is used to store liquid SF6. A self-controlled valve is provided on the pipe between the mixed gas separation system and the gas outlet of the gas storage tank. The self-controlled valve is used to open when the pressure in the pipe is greater than the set value to connect the mixed gas separation system and the gas storage tank, and to close when the pressure is less than the set value to disconnect the mixed gas separation system and the gas storage tank.

2. The GIS mixed gas supply station system according to claim 1, characterized in that, A heating system (16) is connected downstream of the liquid storage tank (14), and a gas mixing system (18) is connected downstream of the heating system (16). The gas mixing system (18) is connected to the gas inlet of the storage tank through a connecting pipe.

3. The GIS mixed gas supply station system according to claim 2, characterized in that, The mixed gas mixing system (18) is also connected to a manifold (19), which is connected upstream of the mixed gas mixing system (18) via a pipe, thereby supplying insulating gases of different components.

4. The GIS mixed gas supply station system according to claim 3, characterized in that, Multiple gas cylinders are connected to the manifold (19).

5. The GIS mixed gas supply station system according to claim 3 or 4, characterized in that, A proportional valve is also provided on the manifold (19) or the connecting pipe between the manifold (19) and the mixed gas mixing system (18).

6. The GIS mixed gas supply station system according to any one of claims 2-4, characterized in that, A buffer tank (17) is provided between the mixed gas mixing system (18) and the heating system (16) for buffering and collecting the SF6 gas heated by the heating system (16).

7. The GIS mixed gas supply station system according to claim 6, characterized in that, The buffer tank (17) is equipped with a proportional valve for adjusting the proportion of gas entering the mixed gas system (18) from the buffer tank (17).

8. The GIS mixed gas supply station system according to any one of claims 1-4, characterized in that, A pressure reducer is also connected to the rear end of the automatic control valve.

9. The GIS mixed gas supply station system according to any one of claims 1-4, characterized in that, The gas storage tank is provided in at least two, and each gas storage tank is connected to the mixed gas separation system (13) through an independent connecting pipe.

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