Electrified inflation and gas taking device for high-voltage cable buffer layer and application method of electrified inflation and gas taking device

Abstract

The invention discloses an electrified inflation and gas taking device for a high-voltage cable buffer layer and an application method thereof.The device adopts a buffer connecting mechanism, a high-pressure gas source, a gas supplementing gas source and a gas taking and collecting mechanism which are arranged in parallel are communicated with the interior of the cable buffer layer, and a pressure sensor is located in a buffer main cavity and used for detecting the pressure in the buffer main cavity; compared with the technical scheme that the pressure sensor is arranged in the pipeline, the pressure sensor arranged in the buffer main cavity is not influenced by the flow velocity of the air flow, and the detected pressure value is more accurate and accords with the reality. According to the device, the buffer main cavity and the cable interface are subjected to insulation treatment through the insulation connecting piece, the buffer main cavity does not need to be detached from the cable interface, and inflation and gas taking operation can be carried out when the cable runs in a live-line mode. According to the invention, the high-pressure gas source, the gas supply gas source and the gas taking and collecting mechanism are simultaneously and respectively adopted to carry out gas inflation, gas supply and gas taking operations on the cable buffer layer, and three operations can be realized at one time.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage cable maintenance devices, and in particular to a charged air-inflating and air-extracting device for a high-voltage cable buffer layer and an application method thereof. Background Art

[0002] As the demand for electricity continues to grow, high-voltage cables play an increasingly important role in power transmission. The buffer layer of high-voltage cables plays a key role in the performance and life of the cables.

[0003] Chinese patent publication number CN113653945A discloses an inflation device and inflation method for high-voltage cables, which includes a vacuum pumping structure and an inert gas filling structure connected in parallel, thereby realizing inflation and degassing of the high-voltage cable. However, the applicant found that, on the one hand, since the vacuum pumping structure and the inert gas filling structure are directly connected to the cable joint by a rubber pipe, and the pressure gauge or pressure sensor is arranged on the rubber pipe, whether it is inflation or vacuum pumping, the pressure gauge on the rubber pipe will be affected by the air flow velocity, and the actual pressure data cannot truly reflect the actual pressure, which finally causes the actual gas pressure in the high-voltage cable to deviate from the theoretical pressure. On the other hand, the device can only be used for inflation and degassing operations when the cable is not energized during cable laying construction, and it needs to be dismantled when the cable is energized, and the inflation and degassing operations of the energized cable cannot be realized. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a live air filling and air extraction device for a high-voltage cable buffer layer with more accurate pressure measurement values.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A charged air-inflating and air-collecting device for a high-voltage cable buffer layer, comprising a buffer connecting mechanism, a connecting pipeline, a high-pressure air source, an air-supplementing air source and an air-collecting and air-collecting mechanism, wherein the buffer connecting mechanism is connected to the cable buffer layer, the connecting pipeline comprises a first pipeline, a second pipeline and a third pipeline which are arranged in parallel and can be opened or closed, the high-pressure air source is connected to the buffer connecting mechanism through the first pipeline, the air-supplementing air source is connected to the buffer connecting mechanism through the second pipeline, and the air-collecting and air-collecting mechanism is connected to the buffer connecting mechanism through the third pipeline; the buffer connecting mechanism comprises a buffer main cavity, an insulating connecting piece and a pressure sensor, the pressure sensor is located in the buffer main cavity and is used to detect the pressure of the buffer main cavity, the insulating connecting piece is located on the buffer main cavity and is connected to the cable joint, and the buffer main cavity is connected to the cable buffer layer.

[0007] As a further improvement of the above technical solution:

[0008] The buffer connection mechanism also includes an air supply valve, an air extraction valve, and an air charging valve arranged in parallel on the buffer main cavity, the air supply valve is used to open or close the second pipeline, the air extraction valve is used to open or close the third pipeline, and the air charging valve is used to open or close the first pipeline.

[0009] The buffer connection mechanism also includes a pressure relief valve, which is located on the buffer main cavity.

[0010] The buffer main cavity is made of metal material, and the insulating connector is made of insulating material.

[0011] The insulating connector comprises an upper sealing tube, a connecting flange and a lower sealing tube. The upper sealing tube and the lower sealing tube are connected via the connecting flange. The upper sealing tube is connected to the buffer connecting mechanism, and the lower sealing tube is inserted into the cable connector.

[0012] The electrically charged air-inflating and air-extracting device further comprises a solenoid valve for controlling the second pipeline.

[0013] The electrically charged air-inflating and air-extracting device further comprises a pressure-reducing valve and a flow monitoring component, wherein the pressure-reducing valve and the flow monitoring component are arranged on the first pipeline, and the flow monitoring component is located between the pressure-reducing valve and the air-inflating valve.

[0014] The electrically charged air-inflating and air-extracting device further comprises a pressure-reducing valve and a flow monitoring component, wherein the pressure-reducing valve and the flow monitoring component are arranged on the second pipeline, and the flow monitoring component is located between the pressure-reducing valve and the air-supplying valve.

[0015] The electrically charged air-inflating and air-taking device also includes a controller, which is used to control the opening or closing of the connecting pipeline and the air-taking and collecting mechanism.

[0016] As a general inventive concept, the present invention also provides an application method of the live gas filling and air extraction device for a high-voltage cable buffer layer, comprising at least one of a gas filling step, a gas extraction step and a gas replenishment step:

[0017] The inflation step comprises the following steps:

[0018] A1. Open the first pipeline and use the high-pressure gas source to inflate the cable buffer layer;

[0019] A2. Obtaining pressure data in the buffer connection mechanism;

[0020] A3. Determine whether the pressure data reaches a preset pressure threshold. If yes, close the first pipeline; otherwise, continue to inflate the cable buffer layer until the pressure data reaches the preset pressure threshold;

[0021] The gas extraction step comprises the following steps:

[0022] B1. Open the third pipeline and start the gas collection mechanism to take gas from the cable buffer layer;

[0023] B2. Obtaining pressure data in the buffer connection mechanism;

[0024] B3. Determine whether the pressure data reaches the preset pressure threshold. If yes, close the third pipeline and the gas collection mechanism. Otherwise, continue to take gas from the cable buffer layer until the pressure data reaches the preset pressure threshold.

[0025] The gas replenishing step comprises the following steps:

[0026] C1. Obtaining the pressure data in the buffer connection mechanism;

[0027] C2, determine whether the pressure data reaches the preset pressure threshold, if yes, then end, otherwise go to step C3;

[0028] C3. Open the second pipeline, and use the air supply source to supply air into the cable buffer layer, and execute step C1.

[0029] As a further improvement of the above technical solution:

[0030] The flow monitoring component is located between the pressure reducing valve and the air supply valve.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] The present invention is a live air inflation and air extraction device for a high-voltage cable buffer layer. The buffer connection mechanism is used to connect the high-pressure gas source, the air supply source and the air extraction and collection mechanism arranged in parallel with the cable buffer layer. The pressure sensor is located in the buffer main cavity and is used to detect the pressure in the buffer main cavity. Compared with the technical solution in which the pressure sensor is arranged in the pipeline, the pressure sensor arranged in the buffer main cavity will not be affected by the air flow velocity, and the detected pressure value is more accurate and in line with reality. At the same time, the high-pressure gas source, the air supply source and the air extraction and collection mechanism are respectively used to inflate, replenish and extract air from the cable buffer layer, so that three operations can be achieved at one time. On the other hand, the buffer main cavity and the cable interface are insulated by an insulating connector. The buffer main cavity does not need to be removed from the cable interface. When the cable is energized, the inflation and air extraction operations can also be performed.

[0033] The application method of the live gas charging and air extraction device for the high-voltage cable buffer layer of the present invention is carried out by using the live gas charging and air extraction device of the present invention, and has the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the buffer connection mechanism in the first embodiment of the present invention.

[0035] Figure 2It is a top view of the buffer connection mechanism in the first embodiment of the present invention.

[0036] Figure 3 It is a side view of the buffer connection mechanism in the first embodiment of the present invention.

[0037] Figure 4 It is a schematic diagram of the state of inflation in the first embodiment of the present invention.

[0038] Figure 5 It is a schematic diagram of the state of replenishing gas in the first embodiment of the present invention.

[0039] Figure 6 It is a schematic diagram of the state when gas is taken out in the first embodiment of the present invention.

[0040] The symbols in the figure represent:

[0041] 1. Buffer connection mechanism; 101. Buffer main cavity; 102. Air supply valve; 103. Air extraction valve; 104. Inflating valve; 105. Antenna; 106. Grounding interface; 107. Communication interface; 108. Power extraction interface; 109. Insulating connector; 110. Pressure sensor; 111. Pressure relief valve; 112. Solenoid valve; 191. Upper sealing tube; 192. Connecting flange; 193. Lower sealing tube; 2. High-pressure gas source; 3. Air supply source; 4. Air extraction and collection mechanism; 41. Air extraction machine; 42. Gas collector; 5. Cable buffer layer; 6. Cable connector; 7. Pressure reducing valve; 701. First pipeline; 702. Second pipeline; 703. Third pipeline; 8. Flow monitoring device. DETAILED DESCRIPTION

[0042] The present invention will be described in further detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0043] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Embodiment 1

[0047] like Figures 1 to 6 As shown, the charged inflation and air extraction device for the high-voltage cable buffer layer of this embodiment includes a buffer connection mechanism 1, a connecting pipeline, a high-pressure gas source 2, an air supply source 3 and an air extraction and collection mechanism 4. The buffer connection mechanism 1 is connected to the cable buffer layer 5, and the connecting pipeline includes a first pipeline 701, a second pipeline 702 and a third pipeline 703 which are arranged in parallel and can be opened or closed. The high-pressure gas source 2 is connected to the buffer connection mechanism 1 through the first pipeline 701, the air supply source 3 is connected to the buffer connection mechanism 1 through the second pipeline 702, and the air extraction and collection mechanism 4 is connected to the buffer connection mechanism 1 through the third pipeline 703; the buffer connection mechanism 1 includes a buffer main cavity 101, an insulating connector 109 and a pressure sensor 110, the pressure sensor 110 is located in the buffer main cavity 101 and is used to detect the pressure of the buffer main cavity 101, the insulating connector 109 is located on the buffer main cavity 101 and is connected to the cable connector 6, and the inner chamber of the buffer main cavity 101 is connected to the cable buffer layer 5. The present invention adopts a buffer connection mechanism 1, and connects the high-pressure gas source 2, the air supply source 3 and the air collection mechanism 4 arranged in parallel with the cable buffer layer 5. The pressure sensor 110 is located in the buffer main cavity 101 and is used to detect the pressure in the buffer main cavity 101. Compared with the technical solution in which the pressure sensor 110 is arranged in the pipeline, the pressure sensor 110 arranged in the buffer main cavity 101 will not be affected by the air flow velocity, and the detected pressure value is more accurate and in line with reality. The high-pressure gas source 2 is a large gas cylinder, which is used to inflate the cable during the early cable installation, and requires more gas. The air supply source 3 is a small gas cylinder, which is used to make a small amount of air supply for the slight change of air pressure after the cable is put into operation. Since the buffer main cavity 101 needs to have a certain buffering effect and a containing space, it is generally made of metal materials. The insulating characteristics of the insulating connector 109 insulate and isolate the buffer main cavity 101 and the cable connector 6 to enhance the pressure resistance. The cable connector 6 is a cable accessory, and the buffer main cavity 101 does not need to be removed from the cable accessory.

[0048] like Figure 1 , Figure 2 , Figure 3As shown, the buffer connection mechanism 1 also includes a gas replenishing valve 102, a gas extraction valve 103, and an air charging valve 104 arranged in parallel on the buffer main cavity 101. The gas replenishing valve 102 is used to open or close the second pipeline 702, the gas extraction valve 103 is used to open or close the third pipeline 703, and the air charging valve 104 is used to open or close the first pipeline 701. The buffer connection mechanism 1 of the present invention is made of metal material and installed on the cable accessories. It has the same service life as the cable accessories. In the subsequent flushing and gas extraction operations, these valves (gas replenishing valve 102, gas extraction valve 103, and air charging valve 104) need to be manually operated. Compared with setting these valves on the pipeline, installing these valves in the buffer main cavity 101 is conducive to ensuring the service life of these valves.

[0049] like Figure 1 , Figure 2 , Figure 3 As shown, the buffer connection mechanism 1 further includes a pressure relief valve 111, which is located on the buffer main cavity 101. When it is detected that the air pressure in the cable buffer layer 5 is too high, the pressure relief valve 111 is opened to relieve the pressure.

[0050] like Figure 1 , Figure 2 , Figure 3 As shown, the insulating connector 109 includes an upper sealing tube 191, a connecting flange 192 and a lower sealing tube 193. The upper sealing tube 191 and the lower sealing tube 193 are connected by the connecting flange 192. The upper sealing tube 191 is connected to the buffer connection mechanism 1, and the lower sealing tube 193 is inserted into the cable connector 6. In this embodiment, the lower sealing tube 193 is a part of the cable connector 6, and the two are sealed and connected. Since the cable sheath and the inside of the device are both with high-pressure gas, the connecting flange 192 is used to connect the buffer main cavity 101 as a whole, which is safe and reliable.

[0051] like Figure 5 As shown, the charged air filling and air extraction device also includes a solenoid valve 112 for controlling the second pipeline 702. The air supply valve 102 is a manual switch, which is convenient for on-site operation during early installation or overhaul; the solenoid valve 112 can be remotely controlled, which is convenient for online monitoring of automatic air supply. In this embodiment, the solenoid valve 112 is connected to the internal control circuit of the buffer main cavity 101 and is an integral part of the buffer main cavity 101. The second pipeline 702 and other components outside the buffer main cavity 101 can be removed after inflation.

[0052] like Figure 4 , Figure 5As shown, the charged air-inflating and air-extracting device further includes a pressure reducing valve 7 and a flow monitoring component 8, which are used to stabilize the pressure and perform flow statistics when replenishing or inflating. Specifically, when inflating, the pressure reducing valve 7 and the flow monitoring component 8 are arranged on the first pipeline 701, and the flow monitoring component 8 is located between the pressure reducing valve 7 and the air-inflating valve 104. When replenishing, the pressure reducing valve 7 and the flow monitoring component 8 are arranged on the second pipeline 702, and the flow monitoring component 8 is located between the pressure reducing valve 7 and the air-inflating valve 102. In this embodiment, there are two sets of pressure reducing valves 7 and flow monitoring components 8, which are arranged in the first pipeline 701 and the second pipeline 702, respectively.

[0053] The charged gas-inflating and air-extracting device further includes a controller (not shown in the figure), which is used to control the opening or closing of the connecting pipes (the first pipe 701, the second pipe 702 and the third pipe 703) and the air-extracting and collecting mechanism 4. In this embodiment, the controller controls the opening and closing of each valve to achieve the function of controlling the connecting pipes. At the same time, the controller is also responsible for data collection and processing of the pressure sensor 110.

[0054] like Figure 1 , Figure 2 , Figure 3 As shown, in this embodiment, the buffer main cavity 101 is also provided with an antenna 105, a grounding interface 106, a communication interface 107, and a power supply interface 108. The solenoid valve 112 is located in the buffer main cavity 101, so these electrical components are arranged on the buffer main cavity 101 to facilitate the controller to control the solenoid valve 112. Antenna 105 is a 4G communication antenna, which is used for uploading monitoring data and remotely controlling gas replenishment. The grounding interface 106 is a grounding terminal, because the metal part of the buffer main cavity 101 is insulated from the metal shell of the cable accessories, and a grounding wire needs to be installed. The communication interface 107 is convenient for connecting a handheld device to view monitoring data during on-site operation. The power supply interface 108 is a CT power supply socket, which is used for power supply of the device.

[0055] like Figure 6 As shown, the gas collection mechanism 4 includes a gas extractor 41 and a gas collector 42. The gas extractor 41 is connected to the buffer main cavity 101 through a third pipeline 703 to extract gas in the buffer main cavity 101 and transport it to the gas collector 42. The controller controls the opening or closing of the gas extractor 41.

[0056] Embodiment 2

[0057] The present embodiment adopts an application method of the live gas filling and air extraction device for the high-voltage cable buffer layer of the first embodiment, including a gas filling step, which is performed during construction before the cable is put into operation, and includes the following steps:

[0058] A1. Open the first pipeline 701, and the high-pressure gas source 2 inflates the cable buffer layer 5;

[0059] A2, obtaining pressure data in the buffer connection mechanism 1;

[0060] A3. Determine whether the pressure data reaches a preset pressure threshold. If yes, close the first pipe 701. Otherwise, continue to inflate the cable buffer layer 5 until the pressure data reaches the preset pressure threshold.

[0061] Embodiment 3

[0062] The present embodiment adopts an application method of the live gas-inflating gas extraction device for a high-voltage cable buffer layer of the first embodiment, including a gas extraction step, wherein the gas extraction step is to manually perform gas extraction analysis at a certain time interval during the entire cable life cycle, including the following steps:

[0063] B1. Open the third pipeline 703 and start the air collection mechanism 4 to take air from the cable buffer layer 5;

[0064] B2, obtaining the pressure data in the buffer connection mechanism 1;

[0065] B3. Determine whether the gas pressure data reaches the preset pressure threshold. If yes, close the third pipeline 703 and the gas collection mechanism 4. Otherwise, continue to take gas from the cable buffer layer 5 until the pressure data reaches the preset pressure threshold.

[0066] In this embodiment, the gas collector 42 can be used to collect and analyze the gas taken out to understand the state of the cable buffer layer 5, providing a basis for the operation and maintenance of the cable.

[0067] Embodiment 4

[0068] The present embodiment adopts an application method of the live gas filling and air extraction device for the buffer layer of a high-voltage cable according to the first embodiment, including a gas replenishment step, wherein the gas replenishment is to realize automatic gas replenishment adjustment according to the air pressure data monitored in real time after the cable is put into operation, and includes the following steps:

[0069] C1, obtaining pressure data in the buffer connection mechanism 1;

[0070] C2, determine whether the pressure data reaches the preset pressure threshold, if yes, then end, otherwise go to step C3;

[0071] C3, open the second pipeline 702, and use the air supply source 3 to supply air into the cable buffer layer 5, and execute step C1.

[0072] Embodiment 5

[0073] The present embodiment provides an application method of the charged air-inflating and air-extracting device for a high-voltage cable buffer layer using the first embodiment, comprising an air-extracting step and an air-replenishing step, wherein the two steps are performed simultaneously.

[0074] A computer-readable storage medium stores a computer program or instruction, wherein the computer program or instruction is programmed or configured to execute an application method in Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5 through a processor.

[0075] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0076] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A charged gas-inflating and air-extracting device for a high-voltage cable buffer layer, characterized in that: The invention comprises a buffer connection mechanism (1), a connection pipeline, a high-pressure gas source (2), an air supply source (3) and an air collection mechanism (4); the buffer connection mechanism (1) is connected to the cable buffer layer (5); the connection pipeline comprises a first pipeline (701), a second pipeline (702) and a third pipeline (703) which are arranged in parallel and can be opened or closed; the high-pressure gas source (2) is connected to the buffer connection mechanism (1) through the first pipeline (701); the air supply source (3) is connected to the buffer connection mechanism (1) through the second pipeline (702); The gas collection mechanism (4) is connected to the buffer connection mechanism (1) through a third pipeline (703); the buffer connection mechanism (1) comprises a buffer main cavity (101), an insulating connector (109) and a pressure sensor (110); the pressure sensor (110) is located in the buffer main cavity (101) and is used to detect the pressure of the buffer main cavity (101); the insulating connector (109) is located on the buffer main cavity (101) and is connected to the cable connector (6); the buffer main cavity (101) is connected to the cable buffer layer (5).

2. The electrically charged gas-inflating and air-extracting device according to claim 1, characterized in that: The buffer connection mechanism (1) further comprises an air supply valve (102), an air extraction valve (103), and an air charging valve (104) which are arranged in parallel on the buffer main cavity (101); the air supply valve (102) is used to open or close the second pipeline (702); the air extraction valve (103) is used to open or close the third pipeline (703); and the air charging valve (104) is used to open or close the first pipeline (701).

3. The electrically charged gas-inflating and air-extracting device according to claim 2, characterized in that: The buffer connection mechanism (1) further comprises a pressure relief valve (111), wherein the pressure relief valve (111) is located on the buffer main cavity (101).

4. The electrically charged gas-inflating and air-extracting device according to claim 2, characterized in that: The buffer main cavity (101) is made of metal material, and the insulating connector (109) is made of insulating material.

5. The electrically charged gas-inflating and air-extracting device according to claim 1, characterized in that: The insulating connector (109) comprises an upper sealing tube (191), a connecting flange (192) and a lower sealing tube (193); the upper sealing tube (191) and the lower sealing tube (193) are connected via the connecting flange (192); the upper sealing tube (191) is connected to the buffer connecting mechanism (1); and the lower sealing tube (193) is inserted into the cable connector (6).

6. The electrically charged gas-inflating and air-extracting device according to claim 1, characterized in that: The electrically charged air charging and air extraction device further comprises a solenoid valve (112) for controlling the second pipeline (702).

7. The electrically charged gas-inflating and air-extracting device according to claim 1, characterized in that: The electrically charged air-inflating and air-extracting device further comprises a pressure-reducing valve (7) and a flow monitoring component (8), wherein the pressure-reducing valve (7) and the flow monitoring component (8) are arranged on the first pipeline (701), and the flow monitoring component (8) is located between the pressure-reducing valve (7) and the air-inflating valve (104).

8. The electrically charged gas-inflating and air-extracting device according to claim 1, characterized in that: The electrically charged air-inflating and air-extracting device further comprises a pressure-reducing valve (7) and a flow monitoring component (8), wherein the pressure-reducing valve (7) and the flow monitoring component (8) are arranged on the second pipeline (702), and the flow monitoring component (8) is located between the pressure-reducing valve (7) and the air supply valve (102).

9. The electrically charged gas-inflating and air-extracting device according to claim 1, characterized in that: The electrically charged air-inflating and air-taking device also comprises a controller, which is used to control the opening or closing of the connecting pipeline and the air-taking and collecting mechanism (4).

10. An application method of the live gas filling and air extraction device for a high-voltage cable buffer layer according to any one of claims 1 to 9, characterized in that: The method comprises at least one of an inflation step, an air removal step and an air replenishment step: The inflation step comprises the following steps: A1. Open the first pipeline (701), and use the high-pressure gas source (2) to inflate the cable buffer layer (5); A2. Obtaining pressure data in the buffer connection mechanism (1); A3. Determine whether the pressure data reaches a preset pressure threshold. If yes, close the first pipeline (701); otherwise, continue to inflate the cable buffer layer (5) until the pressure data reaches the preset pressure threshold; The gas extraction step comprises the following steps: B1. Open the third pipeline (703), and start the air collection mechanism (4) to take air from the cable buffer layer (5); B2. Obtaining pressure data in the buffer connection mechanism (1); B3, judging whether the pressure data reaches a preset pressure threshold, if yes, closing the third pipeline (703) and the gas collection mechanism (4), otherwise continuing to take gas from the cable buffer layer (5) until the pressure data reaches the preset pressure threshold; The gas replenishing step comprises the following steps: C1. Obtaining pressure data in the buffer connection mechanism (1); C2, determine whether the pressure data reaches the preset pressure threshold, if yes, then end, otherwise go to step C3; C3, open the second pipeline (702), and use the air supply source (3) to supply air into the cable buffer layer (5), and execute step C1.

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