Inflatable gas-insulated high-voltage switch cabinet

Abstract

The invention relates to the technical field of electrical equipment, and particularly discloses an inflatable gas-insulated high-voltage switch cabinet. The device comprises a cabinet body, a gas box, a grounding column head, a rotating rod and a grounding knife switch are arranged in the cabinet body, an adjusting box is fixedly connected to the side wall of the cabinet body, an indicating rod and an adjusting plate are arranged in the adjusting box in a sliding mode, and the end, close to the bottom of the cabinet body, of the indicating rod penetrates through the adjusting box; an air chamber and a liquid chamber are formed between the adjusting plate and the adjusting box, the air chamber is communicated with the air box, a temperature control assembly used for adjusting the indicating rod is arranged in the adjusting box, and a locking piece used for locking the grounding knife switch is arranged on the cabinet body. According to the invention, the influence of different temperature environments on the air leakage degree of the air box is reduced, a technician can take different measures according to the air leakage degree in the air box, and the safety of the insulated high-voltage switch cabinet is improved.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to a gas-insulated high-voltage switchgear. Background Technology

[0002] Gas-insulated switchgear (C-GIS), as a key piece of equipment in modern power systems, is widely used in substations, traction power supply systems, cement industry, automotive industry, textile, paper and food industry, chemical and pharmaceutical industry, airports and ports, steel rolling mills, shipbuilding industry, and other fields due to its excellent space utilization and safety. Its fully enclosed structure effectively isolates electromagnetic interference while reducing the risk of electric shock.

[0003] Gas-insulated switchgear includes a gas chamber, relay compartment, cable compartment, and operating compartment. The gas chamber contains sealed units such as circuit breaker compartments, busbars, and three-position isolating grounding switches. The gas chamber is primarily filled with gases such as nitrogen and dry air as insulating media. Gas leakage from the gas chamber can easily occur through sealing rings, flange gaps, and welds at its connections. Technicians use pressure sensors inside the gas-insulated switchgear to determine if there are leaks in the gas chamber and employ instruments such as infrared leak detectors to scan potential leak points such as flange gaps and welds, thereby inspecting the gas-insulated switchgear.

[0004] Under normal operating conditions, temperature fluctuations caused by high altitudes and harsh environments can directly affect the pressure of the gas inside the gas box in gas-insulated switchgear. For example, in high-temperature environments during summer, even if there is a leak, the thermal expansion effect may cause the pressure sensor reading to be within the normal range, which can easily lead to misjudgment, delay maintenance, and cause serious accidents such as insulation breakdown. Therefore, improvements are urgently needed. Summary of the Invention

[0005] To address the impact of varying ambient temperatures on the gas pressure inside the gas box caused by high altitude and harsh environments, and to facilitate targeted measures by technical personnel, this application provides an inflatable gas-insulated high-voltage switchgear.

[0006] This application provides a gas-insulated high-voltage switchgear with the following technical solution: The device includes a cabinet, which contains an air box, a grounding terminal, a rotating rod, and a grounding switch. An adjustment box is fixed to the side wall of the cabinet. An indicator rod and an adjustment plate are slidably arranged inside the adjustment box. One end of the indicator rod near the bottom of the cabinet passes through the adjustment box. An air chamber and a liquid chamber are formed between the adjustment plate and the adjustment box. The air chamber is connected to the air box. When the air pressure inside the air box changes, the regulating plate moves inside the regulating box and drives the indicator rod to move through the liquid chamber; The regulating box is equipped with a temperature control component for adjusting the indicator rod, and the cabinet is equipped with a locking component for locking the grounding switch.

[0007] By adopting the above technical solution, if the air pressure in the air box changes during the use of the switchgear, the air chamber in the regulating box is connected to the air box and drives the regulating plate to move in the regulating box. The liquid chamber is filled with sealing liquid, and the regulating plate drives the indicator rod to move through the liquid chamber. The pressure change inside the air box can be identified by observing the length of the indicator rod's movement.

[0008] When the gas box leaks and the ambient temperature of the switchgear changes, the temperature control component adjusts the indicator rod to reduce the impact of temperature changes on the indicator rod, so that the movement length of the indicator rod corresponds to the degree of gas box leakage. When the gas box leaks, the temperature control component eliminates the influence of temperature on the pressure inside the gas box, allowing technicians to identify whether the gas box is leaking by observing the movement length of the indicator rod, effectively reducing the influence of temperature on the degree of gas box leakage.

[0009] When the indicator rod moves, it moves the locking mechanism into place. When technicians inspect the gas box, they rotate the rotating rod to close the grounding switch on the rotating rod with the grounding terminal. At the same time, the locking mechanism locks the rotating rod, ensuring that the grounding terminal and grounding switch remain closed until the gas box is repaired and filled with gas. This effectively ensures the safety of technicians during maintenance.

[0010] Optionally, the temperature control component includes a piston block slidably disposed within the regulating box and a piston plate slidably disposed within the piston block. The piston plate divides the interior of the piston block into a first piston chamber and a second piston chamber. One end of the indicator rod away from the bottom of the cabinet passes through the piston block and is fixed to the piston plate.

[0011] By adopting the above technical solution, when the gas box is leaking and in a high-temperature environment; when the pressure change caused by the leak is greater than the pressure change caused by the temperature, the gas pressure inside the gas box decreases, and the piston block moves downward as a whole through the gas chamber, liquid chamber, and regulating plate; when the pressure change caused by the leak is equal to the pressure change caused by the temperature, the gas pressure inside the gas box remains unchanged, and the piston block remains stationary; when the pressure change caused by the leak is less than the pressure change caused by the temperature, the piston block moves upward as a whole; the high temperature causes the gas inside the first piston chamber to expand, which in turn causes the piston plate to move inside the piston block and the indicator rod to move downward, thereby reducing the impact of the pressure change inside the gas box caused by the high temperature. This allows technicians to observe the degree of gas leakage in the gas box through the indicator rod, and technicians can take different maintenance measures according to the degree of gas leakage in the gas box, reducing personnel injury caused by misjudgment of the degree of gas leakage and improving the safety of the insulated high-voltage switchgear.

[0012] When the gas box is leaking and under low-temperature environmental regulation, the gas pressure inside the gas box decreases. This decrease causes the piston block to move downwards through the gas chamber, liquid chamber, and regulating plate. The low temperature causes the gas inside the first piston chamber to contract, which in turn causes the piston plate to move inside the piston block. The piston plate then moves the indicator rod upwards, thereby reducing the impact of low temperature on the gas pressure changes inside the gas box. This allows technicians to visually identify the degree of gas box leakage through the indicator rod, reducing misjudgments by technicians regarding the degree of gas box leakage.

[0013] Optionally, the temperature control assembly further includes a fixing plate fixed inside the regulating box, the fixing plate and the regulating box forming a temperature control chamber, the temperature control chamber communicating with the first piston chamber, and the temperature control chamber being filled with the same gas as the gas box.

[0014] By adopting the above technical solution, when the environmental conditions of the switch cabinet change, the air pressure in the temperature control chamber changes. The temperature control chamber is connected to the first piston chamber, which causes the piston plate in the piston block to move. The gas filled in the temperature control chamber is the same as that in the gas box, so that the air pressure changes caused by temperature in the temperature control chamber and the gas box are the same.

[0015] Optionally, the side wall of the piston block is provided with a connecting hole and an exhaust groove, and the top wall of the regulating box is provided with an exhaust hole. The connecting hole is located inside the second piston chamber, and the second piston chamber is connected to the outside of the regulating box through the connecting hole, the exhaust groove and the exhaust hole.

[0016] By adopting the above technical solution, when the piston plate moves inside the piston block, the gas in the second piston chamber is discharged outside the regulating box through the connecting hole, the exhaust groove on the side wall of the piston block and the exhaust hole at the top of the movable chamber, thereby reducing the impact of the gas in the second piston chamber on the movement of the piston plate.

[0017] Optionally, a temperature control hole is provided on the side wall of the temperature control chamber, a vent hole is provided on the side wall of the first piston chamber, a fixing block is provided in the second adjustment chamber, the fixing block is movably fitted with the piston block, and the temperature control chamber is connected to the first piston chamber through the temperature control hole / the vent hole.

[0018] By adopting the above technical solution, when the piston block moves, the temperature control chamber is connected to the first piston chamber through the temperature control hole and the vent hole. The length of the vent hole can be less than the length of the temperature control hole, so that the temperature control chamber and the first piston chamber remain connected during the movement of the piston block, and drive the piston plate inside the piston block to move. When the piston block moves in the second regulating chamber, the fixed block abuts against the bottom of the piston block. The fixed block reduces the misalignment of the vent hole and the temperature control hole, and the gas in the temperature control chamber is discharged into the moving chamber, which improves the stability of the insulated high-voltage switchgear.

[0019] Optionally, a first limiting block and a second limiting block are fixedly connected to the inner wall of the piston block, and the first limiting block and the second limiting block are movably fitted to the upper and lower end faces of the piston plate, respectively. The first limiting block is located in the first piston cavity and below the vent hole, and the second limiting block is located in the second piston cavity and above the connecting hole.

[0020] By adopting the above technical solution, when the piston plate moves inside the piston block, the first limiting block and the second limiting block make the piston plate move within a certain range, so that the piston plate will not cross the connecting hole and the vent hole when it moves, so that the gas in the temperature control chamber is connected to the first piston chamber of the piston block, and the second piston chamber is connected to the outside of the regulating box.

[0021] Optionally, a first partition is fixedly connected inside the regulating box, which divides the interior of the regulating box into a first regulating chamber and a second regulating chamber. A second partition is fixedly connected to the inner wall of the second regulating chamber, and the second partition is perpendicular to the first partition. The second partition divides the interior of the second regulating chamber into a movable chamber and a balance chamber. The regulating plate is slidably disposed in the first regulating chamber, the piston block is slidably disposed in the movable chamber, and a balance plate is slidably disposed in the balance chamber. Both the movable chamber and the balance chamber are connected to the liquid chamber.

[0022] By adopting the above technical solution, when the air pressure inside the air box changes, the air box is connected to the air chamber and drives the regulating plate to move in the first regulating chamber. The regulating plate introduces or discharges the sealing liquid in the liquid chamber into the moving chamber and the balance chamber in the second regulating chamber, thereby driving the piston block and the balance plate to move respectively. The volume ratio of the air box to the temperature control chamber is the same as the volume ratio of the sealing liquid introduced into the moving chamber and the balance chamber respectively, so that the air pressure change in the temperature control chamber corresponds to the air pressure change in the air box caused by the temperature. Technicians can identify the degree of air leakage in the air box by observing the length of the indicator rod movement.

[0023] Optionally, the locking element includes a wedge block that is slidably and elastically disposed within the cabinet body. One end of the wedge block is movably engaged with the end of the indicator rod near the bottom of the cabinet body. Two locking plates are elastically and rotatably disposed at the end of the wedge block away from the indicator rod. A locking block is fixedly connected to the end of the wedge block away from the indicator rod. The locking block is movably engaged with the locking plates. A locking rod is fixedly connected to the rotating rod. The locking rod is movably engaged with the two locking plates.

[0024] By adopting the above technical solution, when the gas box leaks, the indicator rod moves downward, and the end of the indicator rod near the bottom of the cabinet abuts against the wedge block, pushing the wedge block to move a certain distance. When the technicians maintain the switch cabinet, they twist the rotating rod, and the grounding switch on the rotating rod closes with the grounding terminal. At the same time, the locking rod on the rotating rod abuts against the locking plate on the wedge block. The locking rod drives the locking plate to rotate. When the grounding switch closes with the grounding terminal, the locking rod passes through the locking plate, and the locking block presses the locking plate against itself, preventing the locking plate from rotating.

[0025] After maintenance is completed and the air pressure in the gas box returns to normal, the indicator rod moves away from the wedge block, and the wedge block moves the locking plate away from the locking rod, thereby unlocking the rotating rod. Technicians can then rotate the rotating rod to disconnect the grounding switch from the grounding terminal and then power on the switchgear. Since the switchgear is de-energized during maintenance, the grounding switch can be locked a second time using the locking device. This reduces the risk of powering on the switchgear if the gas box is under-filled or if there are any leaks, effectively improving the safety of the insulated high-voltage switchgear.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. When the insulated high-voltage switchgear leaks air and is under different temperature conditions, the gas box moves the regulating plate through the gas chamber. The regulating plate moves the piston block in the movable chamber through the liquid chamber. The gas volume in the temperature control chamber changes with temperature and moves the piston plate in the piston block through the first piston chamber, thereby moving the indicator rod in the regulating box. Technicians can identify the air leakage in the gas box by observing the length of the indicator rod's movement. Different treatment measures can be taken according to the different degrees of air leakage in the gas box. Compared with the existing technology that uses pressure sensors to identify whether there is air leakage in the gas box, this insulated high-voltage switchgear reduces the influence of temperature on the degree of air leakage in the gas box. It is beneficial for technicians to take different measures according to the degree of air leakage in the gas box, reducing the risk of gas box insulation breakdown and improving the safety of the insulated high-voltage switchgear. 2. During operation, the gas box moves the regulating plate through the gas chamber, thereby maintaining a constant gas pressure inside the gas box, reducing the risk of the gas box being broken down by electric arc, and reducing mechanical fatigue of the seals, effectively improving the service life and safety performance of the insulated switchgear. 3. When an air leak occurs in the insulated high-voltage switchgear, the indicator rod moves downward, pushing the wedge block a certain distance. Technicians then perform maintenance. The locking rod on the rotating rod abuts against the locking plate. After the locking rod passes through the locking plate, the locking plate locks the locking rod, thus putting the grounding switch in the closed state. After the maintenance is completed, the wedge block moves the locking plate away from the locking rod, thereby unlocking the locking rod. This reduces the risk of omissions during maintenance or insufficient gas filling in the gas box, and improves the safety of the insulated high-voltage switchgear. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application; Figure 2 These are partial structural schematic diagrams of the embodiments of this application; Figure 3 yes Figure 2 A magnified structural diagram of part A in the middle; Figure 4 This is a partial structural schematic diagram of the regulating box used in the embodiments of this application; Figure 5 This is a cross-sectional structural diagram of the regulating box in an embodiment of this application; Figure 6 This is a cross-sectional structural schematic diagram of the regulating box from another perspective in an embodiment of this application; Figure 7 This is a cross-sectional structural diagram of the piston block in an embodiment of this application.

[0029] Reference numerals: 1. Cabinet; 11. Gas box; 12. Grounding terminal; 13. Rotating rod; 14. Grounding switch; 2. Regulating box; 21. First partition; 211. First regulating chamber; 2111. Gas chamber; 2112. Liquid chamber; 212. Second regulating chamber; 2121. Movable cavity; 2122. Balance cavity; 22. Second partition; 23. Balance plate; 24. Exhaust port; 3. Adjusting plate; 4. Indicator rod; 5. Temperature control assembly; 51. Piston block; 511. Connecting hole; 512. Vent hole; 513. Exhaust groove; 514. First limiting block; 515. Second limiting block; 52. Piston plate; 521. First piston chamber; 522. Second piston chamber; 53. Fixing plate; 54. Fixing block; 55. Temperature control chamber; 551. Temperature control hole; 6. Locking component; 61. Wedge block; 62. Locking plate; 63. Locking block; 64. Locking rod. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail below.

[0031] This application discloses an inflatable gas-insulated high-voltage switchgear.

[0032] Reference Figure 1-4A gas-insulated high-voltage switchgear includes a cabinet 1, which is a three-phase common-enclosure type. The cabinet 1 contains a relay compartment, a cable compartment, an operating compartment, and a gas box 11. A rotating rod 13 is rotatably mounted inside the cabinet, and a grounding switch 14 is fixedly connected to the rotating rod 13. A grounding terminal 12 is fixedly connected to the cable compartment. A connecting rod is installed inside the cable compartment, and an operating rod is rotatably mounted thereon. The two ends of the connecting rod are respectively rotatably mounted on the rotating rod 13 and the operating rod, with one end of the operating rod penetrating through the cabinet 1. A regulating box 2 is welded or threadedly connected to the side wall of the cabinet 1. An air pipe for communication is fixed between the regulating box 2 and the air box 11. A first partition 21 is fixed inside the regulating box 2, forming a first regulating chamber 211 and a second regulating chamber 212 with the inner wall of the regulating box 2. An regulating plate 3 is slidably and vertically installed in the first regulating chamber 211, and an indicator rod 4 is vertically installed in the second regulating chamber 212. The indicator rod 4 is provided with a scale, or the scale is provided on the cabinet 1. A dustproof box can be welded or integrally formed at the bottom of the regulating box 2. The end of the indicator rod 4 near the bottom of the cabinet 1 is located inside the dustproof box. The wall can be made of transparent silicone plate, transparent glass plate, etc., and technicians can judge the degree of air leakage in the gas box 11 by observing the scale size. The size of the first adjustment chamber 211 and the second adjustment chamber 212 can be adjusted according to the size of the gas box 11. If the volume of the first adjustment chamber 211 is larger than that of the second adjustment chamber 212, the indicator rod 4 can reflect a wider range of air leakage in the gas box 11, and the indicator rod 4 is also less sensitive. If the volume of the first adjustment chamber 211 is smaller than that of the second adjustment chamber 212, the indicator rod 4 can reflect a smaller range of air leakage in the gas box 11, and the indicator rod 4 is also less sensitive. The indicator rod 4 is more sensitive; the adjustment plate 3 divides the first adjustment chamber 211 into a gas chamber 2111 and a liquid chamber 2112. An opening is provided on the inner wall of the gas box 11, which is connected to the gas pipe. The gas chamber 2111 is connected to the gas box 11 through the opening and the gas pipe. The liquid chamber 2112 is filled with a sealing liquid, which can be a fluorinated liquid, silicone oil, mineral insulating oil, deionized water, hydraulic oil, water-based hydraulic fluid, etc. The adjustment box 2 is equipped with a temperature control component 5 for adjusting the movement of the indicator rod 4 and a locking component 6 for locking the rotating rod 13.

[0033] The insulated high-voltage switchgear adopts a compact three-phase common-enclosure design, filled with dry arc-quenching gas to ensure that the circuit breaker is unaffected by the external environment. Its horizontally arranged three-position switches achieve convenient switching between working, isolated, and grounded states through a mechanical interlocking design. An airtight corrugated pipe (such as PFA or steel corrugated pipe) ensures an airtight connection between the circuit breaker mechanism and the solid-sealed poles. However, when cracks or aging occur at the welds, sealing rings, or flange connections of the gas box 11, it can lead to leakage of the insulating gas, thereby reducing the concentration of the arc-quenching medium. Because the gas in the insulated high-voltage switchgear changes volume due to thermal expansion and contraction during operation at different temperatures, temperature changes make it difficult for technicians to visually determine the leakage situation inside the gas box 11. Pressure monitoring, infrared imaging, or ultrasonic leak detection techniques are required to check for leaks. In extreme cases, the arc-quenching medium may fail, causing arc breakdown inside the gas box 11, generating high temperatures, damaging the equipment, or even causing an explosion.

[0034] If a leak occurs in the gas box 11 during operation of the insulated high-voltage switchgear, the gas box 11 is connected to the gas chamber 2111 through the connecting port. The change in gas pressure inside the gas box 11 causes the regulating plate 3 to move within the first regulating chamber 211. The regulating plate 3, through the sealing liquid filled in the liquid chamber 2112, causes the indicator rod 4 to move within the second regulating chamber 212. Simultaneously, the temperature control component 5 adjusts the indicator rod 4 to eliminate the influence of temperature changes, ensuring that the movement length of the indicator rod 4 corresponds to the degree of leakage in the gas box 11. When the indicator rod 4 moves, it indicates a leak in the gas box 11. The movement of the indicator rod 4 also causes the locking component 6 to take place. Technicians... When repairing the gas box 11, the power to the insulated high-voltage switchgear must first be disconnected. Then, using tools such as a wrench, the operating lever is turned. The operating lever drives the rotating rod 13 to rotate through the connecting rod. The rotating rod 13 drives the grounding switch 14 to rotate, and the grounding switch 14 closes with the grounding terminal 12. The locking component 6 locks the rotating rod 13. After the technician has completed the repair of the switchgear, the gas box 11 needs to be refilled with gas. If the gas pressure in the gas box 11 has not returned to the normal pressure range or if there are any leaks at the connection points of the gas box 11 that were missed during the repair process, the locking component 6 locks the rotating rod 13, thereby improving the safety of the insulated high-voltage switchgear.

[0035] Reference Figure 5-7The temperature control component 5 includes a piston block 51 slidably disposed within the second regulating chamber 212. The piston block 51 is hollow in shape, and a piston plate 52 is slidably disposed within the piston block 51, dividing the interior of the piston block 51 into a first piston chamber 521 and a second piston chamber 522. One end of an indicator rod 4 is fixedly connected to the piston block 51, and a sealing opening is provided at the bottom of the piston block 51. The indicator rod 4 passes through the second piston chamber 522 and slides against the sealing opening. The other end of the indicator rod 4 passes through the regulating box 2. A fixing plate 53 is fixedly connected to the regulating box 2 to form a temperature control chamber 55. The temperature control chamber 55 is connected to the first piston chamber 521 in the piston block 51. A vent hole 512 is provided on the side wall of the piston block 51 that is in contact with the temperature control chamber 55. A temperature control hole 551 is provided on the side wall of the temperature control chamber 55 that is in contact with the piston block 51. The length of the temperature control hole 551 is greater than the length of the vent hole 512. A fixing block 54 is fixedly connected to the inner wall of the movable cavity 2121. The fixing block 54 is movably in contact with the bottom of the piston block 51.

[0036] A second partition 22 is fixedly connected to the side wall of the second regulating chamber 212. The second partition 22 divides the second regulating chamber 212 into a movable chamber 2121 and a balance chamber 2122. A first drain port and a second drain port are provided at the bottom of the first regulating plate 3. The movable chamber 2121 and the balance chamber 2122 are connected to the liquid chamber 2112 through the first drain port and the second drain port, respectively. The piston block 51 is slidably disposed in the movable chamber 2121. A balance plate 23 is slidably and vertically disposed in the balance chamber 2122.

[0037] A connecting hole 511 is provided on the side wall of the piston block 51, and an exhaust groove 513 is provided on the side wall of the piston block 51. An exhaust hole 24 is provided on the top wall of the movable cavity 2121. The second piston cavity 522 is connected to the outside of the regulating box 2 through the connecting hole 511, the exhaust groove 513 and the exhaust hole 24. An exhaust hole 24 is also provided on the side wall of the balance cavity 2122. The balance cavity 2122 is connected to the outside of the regulating box 2 through the exhaust hole 24. A first limiting block 514 and a second limiting block 515 are integrally formed or welded inside the piston block 51. The piston plate 52 is located between the first limiting block 514 and the second limiting block 515. The first limiting block 514 is located below the vent hole 512 and the second limiting block 515 is located above the connecting hole 511. The first limiting block 514 and the second limiting block 515 are movably fitted with the upper and lower end faces of the piston plate 52, respectively.

[0038] Since the air chamber 2111 is connected to the air box 11, the moving distance of the adjusting plate 3 corresponds to the change in the gas volume inside the air box 11. The gas volume inside the temperature control chamber 55 changes due to temperature, and is connected to the first piston chamber 521 through the temperature control hole 551 and the vent hole 512, thereby driving the piston plate 52 to move inside the piston chamber. The moving distance of the piston plate 52 inside the piston block 51 corresponds to the change in volume inside the temperature control chamber 55. The volume ratio between the air box 11 and the temperature control chamber 55 is the same as the volume ratio between the movable chamber 2121 and the balance chamber 2122. Thus, the degree of movement of the piston plate 52 inside the piston block 51 and the degree of movement of the piston block 51 inside the movable chamber 2121 correspond to the change in gas pressure inside the air box 11 due to temperature and the change in gas pressure inside the air box 11 due to the combined effect of leakage and temperature.

[0039] When the gas volume in the gas chamber 11 changes, the regulating plate 3 moves within the first regulating chamber 211 via the gas chamber 2111. The regulating plate 3 introduces the sealing liquid into the movable chamber 2121 and the balance chamber 2122 through the first drain port and the second drain port, respectively. This causes the piston block 51 in the movable chamber 2121 and the balance plate 23 in the balance chamber 2122 to move. The balance chamber 2122 corresponds to the piston block 51, ensuring that the sealing liquid is evenly introduced into the movable chamber 2121 and the balance chamber 2122, respectively. When the temperature changes, the gas volume in the temperature control chamber 55 changes and connects to the first piston chamber 521 through the temperature control hole 551 and the vent hole 512, thereby driving the piston plate. 52 moves within piston block 51, and piston plate 52 drives indicator rod 4 to move within regulating box 2. Indicator rod 4 is positioned by driving locking member 6. The regulating plate 3 effectively maintains the constant air pressure inside gas box 11, so that the air pressure inside gas box 11 remains constant even when there is air leakage or temperature change. Moreover, when the insulated high-voltage switchgear is in a high-temperature environment, the sealing fluid inside regulating box 2 can play a certain cooling role, reducing the risk of gas box 11 in extreme high-temperature environments, effectively improving the working performance of gas box 11, reducing the risk of gas box 11 being broken down by electric arc, and reducing the mechanical fatigue of sealing components, thus effectively improving the service life of insulated switchgear.

[0040] When the balance plate 23 moves within the balance chamber 2122, the gas in the balance chamber 2122 flows through the exhaust hole 24 on the side wall of the balance chamber 2122. The gas in the second movable chamber 2121 flows through the connecting hole 511 and the exhaust groove 513 from the exhaust hole 24 at the top of the movable chamber 2121. When the piston plate 52 moves inside the piston block 51, the movement range of the piston plate 52 is between the first limiting block 514 and the second limiting block 515, thereby causing the gas in the temperature control chamber 55 to be discharged into the first piston chamber 521, and the gas in the second piston chamber 522 to be discharged from the connecting hole 511.

[0041] When gas box 11 leaks and is in a high-temperature environment, if the pressure change caused by the leak is greater than the pressure change caused by the temperature, the pressure inside gas box 11 decreases. This decrease causes the piston block 51 to move downwards via the gas chamber 2111, liquid chamber 2112, and regulating plate 3. The gas in the temperature control chamber 55 causes the piston plate 52 to move downwards. The distance the indicator rod 4 moves reflects the degree of leakage in gas box 11. When the pressure change caused by the leak is equal to the pressure change caused by the temperature, the piston block 51 remains stationary and moves downwards. When the pressure change caused by the leak is less than the pressure change caused by the temperature, the pressure inside gas box 11 increases. The piston block 51 moves upwards, and the piston plate 52 moves downwards, with the piston plate 52 moving a greater distance than the piston block 51. Technicians observe the degree of leakage in gas box 11 through the indicator rod 4, ventilate and cool the insulated high-voltage switchgear, and then perform maintenance.

[0042] When the gas box 11 leaks and is in a low-temperature environment, the piston block 51 moves downward through the gas chamber 2111, liquid chamber 2112 and regulating plate 3, and the gas pressure in the temperature control chamber 55 decreases, causing the piston plate 52 to move upward. When technicians perform maintenance, because the sealing rings and other connecting parts of the gas box 11 are harder and the sealing effect is poor in a low-temperature environment, the gas box 11 connection parts can be ventilated and heated first to enhance the sealing effect of the gas box 11 connection parts.

[0043] When there is no leakage in the gas box 11, if it is in a high-temperature environment, the gas inside the gas box 11 will expand due to the high temperature. This expansion will cause the piston block 51 to move upwards via the regulating plate 3, the gas chamber 2111, and the liquid chamber 2112. Meanwhile, the gas in the temperature control chamber 55 will move the piston plate 52 downwards via the first piston chamber 521, thus keeping the piston plate 52 stationary relative to the regulating box 2. If it is in a low-temperature environment, the piston block 51 will move downwards, and the piston plate 52 will move upwards, thus keeping the piston plate 52 stationary relative to the regulating box 2. The switchgear is in a normal state. Technicians can adjust the insulated switchgear according to the movement length of the indicator rod 4 and different temperature conditions. For maintenance, if the leakage is minor, technicians can simply tighten the sealing parts. If the leakage is severe, technicians can choose to replace the corresponding connecting parts. This insulated high-voltage switchgear is suitable for harsh environments such as high altitudes and large temperature differences between day and night. Compared with the existing technology that judges whether the gas box 11 is leaking by observing the pressure value displayed by the pressure sensor, this insulated high-voltage switchgear eliminates the influence of temperature on the leakage inside the gas box 11. It judges whether the gas box 11 is leaking by observing the length of the movement of the indicator rod 4, which intuitively shows the degree of leakage of the gas box 11 and facilitates technicians to repair the gas box 11 for different degrees of leakage.

[0044] Reference Figure 1-4The locking component 6 includes a wedge block 61 slidably mounted on the cabinet 1. One end of the wedge block 61 is movably fitted with the end of the indicator rod 4 away from the piston block 51. A spring is provided on the wedge block 61. A locking plate 62 is symmetrically and elastically rotatably mounted on the end of the wedge block 61 away from the indicator rod 4. A locking rod 64 is welded or integrally formed on the rotating column. A locking block 63 is integrally formed on the end of the wedge block 61 away from the indicator rod 4. The locking block 63 is movably fitted with the locking plate 62, and the locking rod 64 is movably fitted with the locking plate 62.

[0045] When the gas box 11 leaks, the indicator rod 4 moves downward, and the end of the indicator rod 4 away from the piston block 51 abuts against the wedge block 61, pushing the wedge block 61 to move a certain distance on the cabinet 1. When technicians perform maintenance on the insulated high-voltage switchgear, they use tools such as wrenches to turn the operating rod. The operating rod drives the rotating rod 13 to rotate through the connecting rod. The grounding switch 14 on the rotating rod 13 abuts against the contact post head. At the same time, the locking rod 64 on the rotating post abuts against the locking plate 62, causing the locking plate 62 to rotate. The locking rod 64 passes through the two locking plates 62, and the locking block 63 abuts against the locking block 63 to prevent the locking plate 62 from rotating in the opposite direction, thereby locking the rotating rod 13.

[0046] After maintenance, if the gas volume in the gas box 11 returns to normal, the indicator rod 4 moves away from the wedge block 61. Under the action of the spring, the wedge block 61 drives the locking plate 62 away from the locking rod 64, thereby unlocking the rotating rod 13. The technician can then rotate the operating rod to separate the grounding switch 14 from the grounding terminal 12 and then power on the switchgear. If the gas in the gas box 11 is insufficient or there is a leak in the gas box 11, the locking element 6 keeps the rotating rod 13 locked. By locking the grounding switch 14 with the locking element 6, it is ensured that the insulated high-voltage switchgear can only be powered on after it has returned to normal, effectively improving the safety of the insulated high-voltage switchgear.

[0047] The implementation principle of the gas-insulated high-voltage switchgear in this application embodiment is as follows: When the insulated high-voltage switchgear is under different ambient temperature conditions and gas leakage occurs, the gas pressure in the gas box 11 changes due to the combined effect of gas leakage and temperature. This changes are caused by the gas chamber 2111, the regulating plate 3, and the liquid chamber 2112, which in turn drive the piston block 51 to move within the movable chamber 2121. The temperature control component 5 drives the piston plate 52 to move within the piston block 51. The piston block 51 then drives the indicator rod 4 to move, so that the length of movement of the indicator rod 4 corresponds to the degree of gas leakage in the gas box 11.

[0048] When the gas box 11 is in a leaky and high-temperature environment; when the impact of the leak on the gas pressure is greater than the impact of the high temperature on the gas pressure, the adjusting plate 3 moves upward, the piston block 51 moves downward as a whole, the piston plate 52 moves downward within the piston block 51, and the indicator rod 4 moves downward relative to the adjusting box 2; when the impact of the leak on the gas pressure is equal to the impact of the high temperature on the gas pressure, the adjusting plate 3 and the piston block 51 remain stationary, the piston plate 52 moves downward within the piston block 51, and the indicator rod 4 moves downward relative to the adjusting box 2; when the impact of the leak on the gas pressure is less than the impact of the high temperature on the gas pressure, the adjusting plate 3 moves downward, the piston block 51 moves upward, the piston plate 52 moves downward within the piston block 51, and the indicator rod 4 moves downward relative to the adjusting box 2.

[0049] When the air box 11 is leaking and in a low-temperature environment, the adjusting plate 3 moves upward, the piston block 51 moves downward, the piston plate 52 moves upward inside the piston block 51, and the indicator rod 4 moves downward relative to the adjusting box 2.

[0050] When the air box 11 is normal and in a high-temperature environment, the adjusting plate 3 moves downward, the piston block 51 moves upward, the piston plate 52 moves downward within the piston block 51, and the indicator rod 4 remains stationary relative to the adjusting box 2; when the air box 11 is normal and in a low-temperature environment, the adjusting plate 3 moves upward, the piston block 51 moves downward, the piston plate 52 moves upward within the piston block 51, and the indicator rod 4 remains stationary relative to the adjusting box 2.

[0051] When the gas box 11 is leaking, the indicator rod 4 moves downward and abuts against the wedge block 61, causing the wedge block 61 to move a certain distance. When technicians perform maintenance, they rotate the operating rod, which drives the rotating rod 13 to rotate via the connecting rod. The rotating rod 13 drives the grounding switch 14 to close. At the same time, the locking rod 64 on the rotating column passes through the locking plate 62, and the locking plate 62 locks the locking rod 64. After maintenance is completed, the wedge block 61 drives the locking plate 62 away from the locking rod 64, thereby unlocking the locking rod 64. This insulated switch cabinet, through the regulating box 2, temperature control component 5, indicator rod 4, and locking component 6, facilitates technicians to observe the degree of leakage in the gas box 11 and lock the grounding switch 14. This effectively reduces the risk of technicians misjudging the degree of leakage in the gas box 11 and allows technicians to take targeted measures, reducing the risk of insulation breakdown in the gas box 11.

[0052] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An inflatable gas insulated high-voltage switch cabinet, comprising a cabinet body (1), a gas tank (11), a grounding post head (12), a rotating rod (13) and a grounding blade (14) are arranged in the cabinet body (1), characterized in that: The cabinet (1) side wall is fixed with adjusting box (2), the adjusting box (2) inside slidingly arranged with indicating rod (4) and adjusting plate (3), the indicating rod (4) near the bottom of the cabinet (1) one end penetrates the adjusting box (2), the adjusting plate (3) and the adjusting box (2) form air chamber (2111) and liquid chamber (2112), the air chamber (2111) with the gas tank (11) is communicated; When the gas tank (11) inside gas pressure changes, the adjusting plate (3) moves in the adjusting box (2), and moves the indicating rod (4) through the liquid chamber (2112); The adjusting box (2) is provided with temperature control assembly (5) for adjusting the indicating rod (4), the cabinet (1) is provided with locking member (6) for locking the grounding knife switch (14).

2. The gas-insulated high-voltage switchgear according to claim 1, characterized in that: The temperature control assembly (5) includes a piston block (51) slidingly disposed in the adjusting box (2) and a piston plate (52) slidingly disposed in the piston block (51), the piston plate (52) separates the piston block (51) into a first piston cavity (521) and a second piston cavity (522), the indicating rod (4) is away from the bottom of the cabinet (1) one end through the piston block (51) and is fixed on the piston plate (52).

3. The gas-insulated high-voltage switchgear according to claim 2, characterized in that: The temperature control assembly (5) further includes a fixed plate (53) fixed in the adjusting box (2), the fixed plate (53) and the adjusting box (2) form a temperature control chamber (55), the temperature control chamber (55) is communicated with the first piston cavity (521), the temperature control chamber (55) is filled with the same gas as in the gas tank (11).

4. The gas-insulated high-voltage switchgear according to claim 2, characterized in that: The side wall of the piston block (51) is provided with a communication hole (511) and an exhaust groove (513), the top wall of the adjusting box (2) is provided with an exhaust hole (24), the communication hole (511) is located in the second piston cavity (522), the second piston cavity (522) is communicated with the outside of the adjusting box (2) through the communication hole (511), the exhaust groove (513) and the exhaust hole (24).

5. The gas-insulated high-voltage switchgear according to claim 3, characterized in that: The side wall of the temperature control chamber (55) is provided with a temperature control hole (551), the side wall of the first piston cavity (521) is provided with a ventilation hole (512), the adjusting box (2) is provided with a fixed block (54), the fixed block (54) is movably attached to the piston block (51), the temperature control chamber (55) is communicated with the first piston cavity (521) through the temperature control hole (551) / the ventilation hole (512).

6. The gas-insulated high-voltage switchgear according to claim 5, characterized in that: The first limiting block (514) and the second limiting block (515) are movably attached to the upper and lower end faces of the piston plate (52) respectively, the first limiting block (514) is located in the first piston cavity (521) and below the air hole (512), and the second limiting block (515) is located in the second piston cavity (522) and above the communication hole (511).

7. An inflatable gas insulated high voltage switchgear according to claim 2, characterized in that: The first partition plate (21) is fixedly connected in the adjusting box (2), the first partition plate (21) divides the adjusting box (2) into a first adjusting chamber (211) and a second adjusting chamber (212), the second partition plate (22) is fixedly connected to the inner wall of the second adjusting chamber (212), the second partition plate (22) is perpendicular to the first partition plate (21), the second partition plate (22) divides the second adjusting chamber (212) into a movable cavity (2121) and a balance cavity (2122), the adjusting plate (3) is slidably arranged in the first adjusting chamber (211), the piston block (51) is slidably arranged in the movable cavity (2121), and the balance plate (23) is slidably arranged in the balance cavity (2122). The movable cavity (2121) and the balance cavity (2122) are connected with the liquid chamber (2112).

8. The gas-insulated high-voltage switchgear according to claim 1, characterized in that: The locking piece (6) comprises a wedge-shaped block (61) slidably and elastically arranged in the cabinet body (1), one end of the wedge-shaped block (61) is movably attached to the end of the indicating rod (4) close to the bottom of the cabinet body (1), the other end of the wedge-shaped block (61) away from the indicating rod (4) is elastically and rotatably provided with two locking plates (62), the other end of the wedge-shaped block (61) away from the indicating rod (4) is fixedly connected with a locking block (63), the locking block (63) is movably attached to the locking plate (62), and the rotating rod (13) is fixedly connected with a locking rod (64), the locking rod (64) is movably attached to the two locking plates (62).

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