A gas insulated metal enclosed line (GIL) gas cell structure

Abstract

The application relates to a novel gas insulated metal enclosed line (GIL) gas chamber structure, which comprises a GIL pipeline, a GIL gas chamber arranged in the GIL pipeline, the GIL gas chamber comprises a plurality of large gas chamber connecting arrangements, two adjacent large gas chambers are separated by a first sealing element and are bridged by a first stainless steel pipe, the large gas chamber comprises a small gas chamber, a middle gas chamber and a small gas chamber which are connected in sequence, the middle gas chamber and the two small gas chambers are separated by a second sealing element respectively and are bridged by a second stainless steel pipe, and the small gas chamber and the middle gas chamber are both provided with a gas charging and discharging port. The large gas chamber structure is optimized and designed, when one of the gas chambers needs to be pumped or vacuumized for maintenance, only one middle gas chamber and two small gas chambers with a small-middle-small structure or a middle-small-small structure need to be pumped and depressurized, the total length is only equivalent to the length of one complete large gas chamber, and the maintenance time is greatly shortened.

Description

Technical Field

[0001] This invention belongs to the field of power system transmission line technology, and in particular relates to a gas-insulated metal-enclosed line (GIL) gas chamber structure. Background Technology

[0002] Gas-insulated metal-enclosed transmission lines (GILs) can replace traditional overhead lines or power cables due to their large transmission capacity, low loss, high safety, and environmental friendliness. They can be used for large-capacity, long-distance power transmission.

[0003] GIL (Gas Insulation Line) systems typically employ a multi-chamber configuration. Taking a typical 84-meter-long large chamber as an example, it comprises seven 12-meter standard sections connected together. Adjacent standard sections are connected by flanges, and both ends of each standard section are separated by enclosed basin-type insulators, forming an 84-meter-long large chamber. When one chamber requires evacuation or vacuuming for maintenance, considering the structural strength of the basin-type insulators at both ends, it is usually necessary to perform a half-pressure reduction on the two adjacent large chambers. Due to this traditional chamber structure, when one chamber needs evacuation for maintenance, the entire 252-meter-long GIL system across three large chambers must be evacuated and depressurized, resulting in a long maintenance time and a large workload. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a gas-insulated metal-enclosed circuit (GIL) chamber structure, which optimizes the design of the large chamber structure, significantly shortens the maintenance time of GIL equipment, and reduces the workload.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A gas-insulated metal-enclosed circuit (GIL) chamber structure includes a GIL pipe and a GIL chamber disposed within the GIL pipe. The GIL chamber comprises multiple large chambers connected together. Adjacent large chambers are separated by a first sealing element and connected by a first stainless steel pipe. Each large chamber includes a small chamber, a medium chamber, and a small chamber connected in sequence. The medium chamber is separated from each of the two small chambers by a second sealing element and connected by a second stainless steel pipe. Each small chamber and the medium chamber is provided with an inflation / deflation port.

[0007] Preferably, the first stainless steel pipe is provided with a first check valve at both ends, and the second stainless steel pipe is provided with a second check valve at both ends.

[0008] Preferably, both the first and second seals are pot-type insulators.

[0009] Preferably, the atmospheric chamber comprises multiple standard pipe sections connected in a continuous manner, with adjacent standard pipe sections connected by a butt flange.

[0010] Preferably, the small air chamber includes half a standard pipe section, the medium air chamber includes N standard pipe sections connected together, and the large air chamber includes N+1 standard pipe sections connected together.

[0011] Preferably, the length of the standard pipe section is L1, the length of the small air chamber is L2=L1 / 2, the length of the medium air chamber is L3=N*L1, and the length of the large air chamber is L4=(N+1)*L1.

[0012] Preferably, the air inlet is removably equipped with an air inlet / outlet device. When any air chamber needs maintenance, the air inlet / outlet device is used to extract or release air from the adjacent air chambers at both ends of any air chamber.

[0013] Preferably, the gas filling and discharging device is connected to a gas recovery device.

[0014] Preferably, the gas recovery device includes a gas filling / discharging pipeline arranged parallel to the GIL pipeline, and a ground workstation connected to the gas filling / discharging pipeline.

[0015] Preferably, the inflation / deflation pipeline includes multiple horizontal inflation / deflation pipes corresponding to the atmospheric chamber, and at least one vertical inflation / deflation pipe connected to the ground workstation. The horizontal inflation / deflation pipes and the vertical inflation / deflation pipes are connected by flexible hoses, and two adjacent horizontal inflation / deflation pipes are connected by flexible hoses.

[0016] In summary, the advantages of this invention are:

[0017] The atmospheric chamber structure was optimized by dividing it into a small-medium-small-chamber structure. Within each atmospheric chamber, one medium-sized chamber and two small chambers form independent chambers. When one chamber requires evacuation or vacuuming for maintenance, considering the structural strength at both ends, pressure reduction measures are implemented on the adjacent chambers on either side. Compared to the previous method of evacuating and depressurizing three complete atmospheric chambers, this now only requires evacuating and depressurizing one medium-sized chamber and two small chambers in the small-medium-small or medium-small-small structure. The total length is equivalent to that of a single complete atmospheric chamber, significantly reducing maintenance time in the tunnel. To ensure that adjacent atmospheric chambers are independent yet controllable, adjacent atmospheric chambers are separated by a first sealing element and bridged by a first stainless steel pipe. Similarly, to ensure that one medium-sized chamber and two small chambers within each atmospheric chamber are independent yet controllable, the medium-sized chamber and two small chambers are separated by a second sealing element and bridged by a second stainless steel pipe. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of an atmospheric chamber in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0021] Figure 4 This is a schematic diagram of the venting and venting connection in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the inflation / deflation pipeline in an embodiment of the present invention.

[0023] Figure label:

[0024] 1. GIL pipe; 2. Large air chamber; 21. Small air chamber; 22. Medium air chamber; 23. Standard pipe section; 24. Connecting flange; 25. Second seal; 26. Second stainless steel pipe; 27. Second check valve; 3. First seal; 4. First stainless steel pipe; 5. Inflation / discharge port; 6. Inflation / discharge device; 7. Gas recovery device; 71. Inflation / discharge pipeline; 711. Horizontal inflation / discharge pipe; 712. Vertical inflation / discharge pipe; 713. Hose; 72. Ground workstation; 8. First check valve. Detailed Implementation

[0025] To more clearly illustrate the overall concept of the present invention, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationships, are based solely on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0026] Example

[0027] A gas-insulated metal-enclosed circuit (GIL) gas chamber structure, such as Figure 1-5 As shown, it includes a GIL pipe 1 and a GIL gas chamber disposed within the GIL pipe 1. The GIL gas chamber includes multiple large gas chambers 2 connected together. Two adjacent large gas chambers 2 are separated by a first sealing element 3 and connected by a first stainless steel pipe 4. Each large gas chamber 2 includes a small gas chamber 21, a medium gas chamber 22 and a small gas chamber 21 connected in sequence. The medium gas chamber 22 is separated from the two small gas chambers 21 by a second sealing element 25 and connected by a second stainless steel pipe 26. Both the small gas chamber 21 and the medium gas chamber 22 are provided with a filling / draining port 5.

[0028] The first stainless steel pipe 4 is provided with a first check valve 8 at both ends, and the second stainless steel pipe 26 is provided with a second check valve 27 at both ends. Both the first sealing element 3 and the second sealing element 25 are basin-type insulators.

[0029] To meet the standardization and ease of assembly requirements of the atmospheric chamber 2, the atmospheric chamber 2 includes multiple standard pipe sections 23 connected in a continuous manner, with adjacent standard pipe sections 23 connected by a butt flange 24.

[0030] To shorten maintenance time, the structure of the atmospheric chamber 2 is optimized. The small chamber 21 includes half a standard pipe section 23, the medium chamber 22 includes N standard pipe sections 23 connected together, and the atmospheric chamber 2 includes N+1 standard pipe sections 23 connected together. The length of the standard pipe section 23 is L1, the length of the small chamber 21 is L2 = L1 / 2, the length of the medium chamber 22 is L3 = N*L1, and the length of the atmospheric chamber 2 is L4 = (N+1)*L1.

[0031] Taking a typical 84-meter-long atmospheric chamber 2 as an example, referring to Figure 2 The standard pipe section 23 has a length L1 of 12 meters. Therefore, the length of the small chamber 21 is L2 = 6 meters, and the length of the medium chamber 22 is L3 = 72 meters. Thus, the 84-meter-long large chamber 2 will be sequentially divided into a 6-meter-long small chamber 21, a 72-meter-long medium chamber 22, and another 6-meter-long small chamber 21. Adjacent large chambers 2 are sealed and separated by basin-type insulators, forming independent chambers. Within each large chamber 2, one medium chamber 22 is sealed and separated from two small chambers 21 by basin-type insulators, also forming independent chambers. Within each large chamber 2, one medium chamber 22 is bridging with two small chambers 21 via a second stainless steel pipe 26. Second check valves 27 are installed at both ends of the second stainless steel pipe 26. By controlling the second check valves 27, the connection between the chambers within the large chamber 2 can be controlled to meet operational requirements.

[0032] When one of the air chambers needs to be evacuated or vacuumed for maintenance, considering the structural strength of the basin-type insulators at both ends of the air chamber, when taking measures to reduce the pressure of the adjacent air chambers on both sides of this air chamber, compared to the previous requirement to evacuate and depressurize three complete large air chambers 2, now only one medium air chamber 22 and two small air chambers 21 of the small-medium-small or medium-small-small structure need to be evacuated and depressurized. The total length is only equivalent to the length of one complete large air chamber 2, which greatly shortens the maintenance time in the tunnel.

[0033] To facilitate inflation and deflation during maintenance, such as Figure 4As shown, the gas filling / draining port 5 is removably equipped with a gas filling / draining device 6. When any gas chamber needs maintenance, the gas filling / draining device 6 is used to extract or release gas from the adjacent gas chambers at both ends of any gas chamber. The gas filling / draining device 6 is connected to a gas recovery device 7. The gas recovery device 7 includes a gas filling / draining pipeline 71 arranged parallel to the GIL pipeline 1, and a ground workstation 72 connected to the gas filling / draining pipeline 71.

[0034] like Figure 5 The inflation / deflation pipeline 71 includes a plurality of horizontal inflation / deflation pipes 711 corresponding to the atmospheric chamber 2, and at least one vertical inflation / deflation pipe 712 connected to the ground workstation 72. The horizontal inflation / deflation pipes 711 and the vertical inflation / deflation pipes 712 are connected by hoses 713, and two adjacent horizontal inflation / deflation pipes 711 are connected by hoses 713.

[0035] In addition to the preferred embodiments described above, there are other embodiments of the present invention. Those skilled in the art can make various changes and modifications based on the present invention, and as long as they do not depart from the spirit of the present invention, they should all fall within the scope defined by the appended claims.

Claims

1. A gas-insulated metal-enclosed circuit (GIL) chamber structure, comprising a GIL conduit and a GIL chamber disposed within the GIL conduit, characterized in that: The GIL chamber comprises multiple large air chambers connected together. Adjacent air chambers are separated by a first sealing element and connected by a first stainless steel pipe. Each air chamber includes a small air chamber, a medium air chamber, and another small air chamber connected in sequence. The medium air chamber is separated from each of the two small air chambers by a second sealing element and connected by a second stainless steel pipe. Both the small and medium air chambers are provided with filling and venting ports. Each air chamber comprises multiple standard pipe sections connected in a continuous manner. Adjacent standard pipe sections are connected by a butt flange. Each small air chamber comprises half a standard pipe section. Each medium air chamber comprises N standard pipe sections connected together. Each air chamber comprises N+1 standard pipe sections connected together. The length of each standard pipe section is L1. The length of each small air chamber is L2 = L1 / 2. The length of each medium air chamber is L3 = N * L1. The length of each air chamber is L4 = (N+1) * L1.

2. The gas-insulated metal-enclosed circuit (GIL) chamber structure according to claim 1, characterized in that: The first stainless steel pipe is provided with a first check valve at both ends, and the second stainless steel pipe is provided with a second check valve at both ends.

3. The gas-insulated metal-enclosed circuit (GIL) chamber structure according to claim 2, characterized in that: Both the first and second seals are pot-type insulators.

4. A gas-insulated metal-enclosed circuit (GIL) chamber structure according to any one of claims 1-3, characterized in that: The gas filling and venting port is removably equipped with a gas filling and venting device. When any gas chamber needs maintenance, the gas filling and venting device is used to extract and release gas from the adjacent gas chambers at both ends of any gas chamber.

5. The gas-insulated metal-enclosed circuit (GIL) chamber structure according to claim 4, characterized in that: The gas filling and discharging device is connected to the gas recovery device.

6. The gas-insulated metal-enclosed circuit (GIL) chamber structure according to claim 5, characterized in that: The gas recovery device includes a gas filling and discharging pipeline arranged parallel to the GIL pipeline, and a ground workstation connected to the gas filling and discharging pipeline.

7. The gas-insulated metal-enclosed circuit (GIL) chamber structure according to claim 6, characterized in that: The inflation / deflation pipeline includes multiple horizontal inflation / deflation pipes corresponding to the atmospheric chamber, and at least one vertical inflation / deflation pipe connected to the ground workstation. The horizontal inflation / deflation pipes and the vertical inflation / deflation pipes are connected by flexible hoses, and two adjacent horizontal inflation / deflation pipes are connected by flexible hoses.

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