A pipe gallery gas charging and discharging device for a gas insulated metal enclosed transmission line

Abstract

The application relates to a pipe gallery gas charging and discharging device for a gas insulated metal enclosed power transmission line, and the pipe gallery gas charging and discharging device for the gas insulated metal enclosed power transmission line comprises a GIL pipe gallery, a GIL pipe arranged in the GIL pipe gallery, a gas charging and discharging pipeline arranged in parallel with the GIL pipe, and a ground workstation connected with the gas charging and discharging pipeline. The GIL pipe comprises a plurality of GIL units connected and arranged, both ends of each GIL unit are respectively provided with a gas charging and discharging port with a check valve, and the gas charging and discharging pipeline is connected with the gas charging and discharging port and controls gas charging and discharging through a gas charging and discharging device. When any GIL unit in the GIL pipe gallery needs to be charged and discharged, one end of the gas charging and discharging device can be connected with the gas charging and discharging port of the corresponding GIL unit, the other end of the gas charging and discharging device is connected with the closest gas charging and discharging pipeline, the gas charging and discharging pipeline is communicated to the ground workstation, gas charging and discharging is convenient and flexible, and the gas recovery workload is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power system transmission line, and particularly relates to a pipe gallery gas charging and discharging device for a gas insulated metal enclosed transmission line. BACKGROUND

[0002] The gas insulated metal enclosed transmission line can replace the traditional overhead line or power cable due to its large transmission capacity, small loss, high safety and environmental friendliness, and can be used for large-capacity and long-distance power transmission.

[0003] The GIL pipeline is generally connected by multiple GIL units, and the length of the GIL line is mostly more than 1kM. The distance between the working wells in the GIL line is very long. In the prior art, the gas recovery device is generally used to pump the gas in the tunnel to the gas cylinder, and then the gas cylinder is transported to the ground for centralized treatment. Since the working space in the tunnel is generally narrow, the volume of the gas cylinder is also small, and a large number of gas cylinders need to be transported from the tunnel to the ground multiple times, which greatly increases the workload of gas recovery. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a pipe gallery gas charging and discharging device for a gas insulated metal enclosed transmission line, which is convenient and flexible for gas charging and discharging, and greatly reduces the workload of gas recovery.

[0005] In order to solve the above technical problems, the present application is realized by the following technical scheme:

[0006] A pipe gallery gas charging and discharging device for a gas insulated metal enclosed transmission line, comprising a GIL pipe gallery, a GIL pipeline arranged in the GIL pipe gallery, a gas charging and discharging pipeline arranged in parallel with the GIL pipeline, and a ground workstation connected with the gas charging and discharging pipeline, wherein the GIL pipeline comprises multiple GIL units connected in series, each GIL unit is provided with a gas charging and discharging port with a check valve at both ends, and the gas charging and discharging pipeline is connected with the gas charging and discharging port through a gas charging and discharging device to control the gas charging and discharging.

[0007] Preferably, the gas charging and discharging pipeline comprises multiple horizontal gas charging and discharging pipelines corresponding to the GIL units, and at least one vertical gas charging and discharging pipeline connected with the ground workstation.

[0008] Preferably, the horizontal gas charging and discharging pipeline is connected with the vertical gas charging and discharging pipeline through a hose, and two adjacent horizontal gas charging and discharging pipelines are connected through a hose.

[0009] Preferably, the GIL unit comprises a GIL gas chamber, the GIL gas chamber comprises a small gas chamber, a middle gas chamber and a small gas chamber connected in series, the middle gas chamber is sealed and separated from the two small gas chambers by a basin-type insulator, and is connected by a stainless steel pipe with a double-head check valve.

[0010] As preferred, the GIL unit comprises a plurality of standard pipe segments connected in series, and two adjacent standard pipe segments are connected through butt flanges.

[0011] As preferred, the small gas chamber comprises half a standard pipe segment, the middle gas chamber comprises N standard pipe segments connected in series, and the GIL unit comprises N+1 standard pipe segments connected in series.

[0012] As preferred, the length of the standard pipe segment is L1, the length of the small gas chamber is L2=L1 / 2, the length of the middle gas chamber is L3=N*L1, and the length of the GIL unit is L4=(N+1)*L1.

[0013] As preferred, the GIL gas chambers of two adjacent GIL units are sealed and separated by a basin insulator, and are connected by a stainless steel pipe with a double-head check valve.

[0014] In summary, the application has the following advantages:

[0015] When any GIL unit in the GIL pipe gallery needs to be charged and discharged, the nearest charging and discharging pipeline can be selected flexibly, one end of the charging and discharging device is connected to the charging and discharging port on the corresponding GIL unit, the other end of the charging and discharging device is connected to the nearest charging and discharging pipeline, and the charging and discharging pipeline is connected to the ground workstation for direct gas recovery. Compared with the prior art, the gas recovery device is used to pump gas in the tunnel to the gas cylinder, and then the gas cylinder is transported to the ground for centralized treatment, which does not require manual transportation, saves manual labor, is more flexible to operate, and is more convenient for gas recovery. Each GIL unit is provided with a charging and discharging port at each end, and a check valve is arranged on each charging and discharging port. The check valve can only discharge gas in one direction, avoiding backflow during gas pumping and preventing external impurities from flowing into the GIL unit, thereby being safer to use. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of the application;

[0017] Figure 2 FIG. 4 is a structural and positional schematic diagram of a GIL pipeline and a horizontal charging and discharging pipeline in an embodiment of the application;

[0018] Figure 3 FIG. 6 is a structural schematic diagram of a charging and discharging pipeline in an embodiment of the application;

[0019] Figure 4 FIG. 8 is a structural schematic diagram of a GIL unit in an embodiment of the application;

[0020] Figure 5 FIG. 10 is a partial enlarged schematic diagram of position A in FIG. 9. Figure 4 FIG. 10 is a partial enlarged schematic diagram of position A in FIG. 9.

[0021] Reference signs:

[0022] 1, GIL pipe; 2, GIL unit; 21, small air chamber; 22, middle air chamber; 23, standard pipe section; 24, butt flange; 3, basin insulator; 4, stainless steel pipe; 5, gas charging and discharging port; 6, gas charging and discharging device; 7, gas charging and discharging pipeline; 71, horizontal gas charging and discharging pipe; 72, vertical gas charging and discharging pipe; 73, hose; 8, ground station; 9, GIL pipe gallery. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the overall concept of the present application, the present application will be further described below in conjunction with the drawings and specific embodiments. It should be understood that the following "up", "down", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" and other words indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices / components must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0024] EMBODIMENT

[0025] A gas charging and discharging device for a gas insulated metal enclosed transmission line, as shown in Figures 1-5 , comprising a GIL pipe gallery 9, a GIL pipe 1 arranged in the GIL pipe gallery 9, a gas charging and discharging pipeline 7 arranged in parallel with the GIL pipe 1, and a ground station 8 connected with the gas charging and discharging pipeline 7, wherein the GIL pipe 1 is provided with a plurality of gas charging and discharging ports 5, and the gas charging and discharging pipeline 7 is connected with the gas charging and discharging ports 5 through a gas charging and discharging device 6 to control the gas charging and discharging.

[0026] The present application facilitates maintenance and gas charging and discharging. The gas charging and discharging device 6 can be removably arranged at the gas charging and discharging port 5. When any air chamber needs to be maintained, one end of the gas charging and discharging device 6 can be connected to the corresponding gas charging and discharging port 5 of the air chamber through a hose 73, and the other end of the gas charging and discharging device 6 can be connected to the nearest gas charging and discharging pipeline 7. The gas charging and discharging pipelines 7 are connected to the ground station 8 through the hose 73. The operation is more flexible, the gas recovery is facilitated, and the gas recovery workload is greatly reduced.

[0027] In order to meet the standardization and facilitate assembly of the GIL pipe 1, as shown in Figure 2 , the GIL pipe 1 comprises a plurality of GIL units 2 arranged in connection, and each GIL unit 2 is provided with a gas charging and discharging port 5 with a check valve at both ends.

[0028] In order to flexibly connect the gas charging and discharging device 6 to meet the gas charging and discharging needs of different air chambers, as shown in Figure 3, the gas charging and discharging pipeline 7 includes a plurality of horizontal gas charging and discharging pipes 71 corresponding to the GIL unit 2, and at least one vertical gas charging and discharging pipe 72 connected with the ground station 8. Among them, the horizontal gas charging and discharging pipe 71 and the vertical gas charging and discharging pipe 72 are connected through a hose 73, and adjacent two horizontal gas charging and discharging pipes 71 are connected through a hose 73.

[0029] In order to shorten the maintenance time, the structure of the GIL unit 2 is optimized and designed, referring to Figure 4 and Figure 5 , the GIL unit 2 includes a GIL air chamber, the GIL air chamber includes a small air chamber 21, a middle air chamber 22 and a small air chamber 21 connected in turn, the middle air chamber 22 is sealed and separated from the two small air chambers 21 through the basin type insulator 3 respectively, and is crossed through the stainless steel pipe 4 with double head check valve. The GIL unit 2 includes a plurality of standard pipe sections 23 connected through, adjacent two standard pipe sections 23 are connected through butt flanges 24. The GIL air chambers of adjacent two GIL units 2 are sealed and separated through the basin type insulator 3, and are crossed through the stainless steel pipe 4 with double head check valve.

[0030] Specifically, the small air chamber 21 includes half a standard pipe section 23, the middle air chamber 22 includes N standard pipe sections 23 connected, and the GIL unit 2 includes N+1 standard pipe sections 23 connected. The length of the standard pipe section 23 is L1, the length of the small air chamber 21 is L2=L1 / 2, the length of the middle air chamber 22 is L3=N*L1, and the length of the GIL unit 2 is L4=(N+1)*L1.

[0031] Taking a typical 84-meter-long GIL unit 2 as an example, the length L1 of the standard pipe section 23 is 12 meters, then the length L2 of the small air chamber 21 is 6 meters, and the length L3 of the middle air chamber 22 is 72 meters. Therefore, the 84-meter-long GIL unit 2 will be divided into a 6-meter-long small air chamber 21, a 72-meter-long middle air chamber 22 and a 6-meter-long small air chamber 21 in turn. The GIL unit 2 and the GIL unit 2 adjacent thereto are sealed and separated through the basin type insulator 3, and constitute independent air chambers. In each GIL unit 2, a middle air chamber 22 and two small air chambers 21 are sealed and separated through the basin type insulator 3 respectively, and also constitute independent air chambers. In each GIL unit 2, a middle air chamber 22 and two small air chambers 21 are crossed through the stainless steel pipe 4, and a check valve is arranged at both ends of the stainless steel pipe 4 respectively, and the communication of the air chambers in the GIL unit 2 can be controlled by controlling the check valve to meet the working needs.

[0032] When one of the gas chambers needs to be pumped or vacuumed for maintenance, due to the structural strength of the pot-type insulator 3 at both ends of the gas chamber, the adjacent gas chambers on both sides of the gas chamber are reduced to half pressure, compared with the previous need to pump and reduce the pressure of three complete GIL units 2, now only one middle gas chamber 22 and two small gas chambers 21 of small-middle-small or middle-small-small structure need to be pumped and reduced in pressure, and the total length is only equivalent to the length of one complete GIL unit 2, greatly shortening the maintenance time in the tunnel.

[0033] In addition to the preferred embodiments described above, the present application has other embodiments, and those skilled in the art can make various changes and modifications according to the present application, as long as they do not deviate from the spirit of the present application, and should belong to the scope defined by the appended claims of the present application.

Claims

1. A pipe gallery gas charging and discharging device for a gas insulated metal enclosed transmission line, characterized by: The application relates to a GIL pipe gallery, a GIL pipe arranged in the GIL pipe gallery, a gas charging and discharging pipeline arranged in parallel with the GIL pipe, a ground workstation connected with the gas charging and discharging pipeline, wherein the GIL pipe comprises a plurality of GIL units connected in sequence, each of the GIL units is provided with a gas charging and discharging port with a check valve at two ends, the gas charging and discharging pipeline is connected with the gas charging and discharging port and controls gas charging and discharging through a gas charging and discharging device; the GIL unit comprises a GIL air chamber, the GIL air chamber comprises a small air chamber, a middle air chamber and a small air chamber connected in sequence, the middle air chamber is sealed and separated from the two small air chambers through a basin-type insulator, and is connected through a stainless steel pipe with double-end check valves, the check valves can be controlled to control the communication of the air chambers in the GIL unit; when one of the air chambers needs to be pumped or vacuumized for maintenance, the adjacent air chambers on both sides of the air chamber are first half-pressurized, and the air chamber is pumped or vacuumized for maintenance.

2. The gas charging and discharging device for the pipe gallery of the gas insulated metal enclosed transmission line according to claim 1, characterized in that: The gas charging and discharging pipeline comprises a plurality of horizontal gas charging and discharging pipelines corresponding to the GIL units and at least one vertical gas charging and discharging pipeline connected with the ground workstation.

3. The gas charging and discharging device for the pipe gallery of the gas insulated metal enclosed transmission line according to claim 2, characterized in that: The horizontal gas charging and discharging pipelines are connected through a hose, and two adjacent horizontal gas charging and discharging pipelines are connected through a hose.

4. The gas charging and discharging device for the pipe gallery of the gas insulated metal enclosed transmission line according to claim 1, characterized in that: The GIL unit comprises a plurality of standard pipe segments connected in sequence, and two adjacent standard pipe segments are connected through butt flanges.

5. The gas charging and discharging device for the pipe gallery of the gas insulated metal enclosed transmission line according to claim 4, characterized in that: The small air chamber comprises a half standard pipe segment, the middle air chamber comprises N standard pipe segments connected in sequence, and the GIL unit comprises N+1 standard pipe segments connected in sequence.

6. The gas charging and discharging device for the pipe gallery of the gas insulated metal enclosed transmission line according to claim 5, characterized in that: The length of the standard pipe segment is L1, the length of the small air chamber is L2=L1 / 2, the length of the middle air chamber is L3=N*L1, and the length of the GIL unit is L4=(N+1)*L1.

7. The gas charging and discharging device for the pipe gallery of a gas insulated metal enclosed transmission line according to any one of claims 4-6, characterized in that: Two adjacent GIL units are sealed and separated through a basin-type insulator, and are connected through a stainless steel pipe with double-end check valves.

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