Gas-insulated switching device

Abstract

The present invention provides a compact gas-insulated switching device (50). The gas-insulated switching device (50) comprises: a container (20) filled with an insulating gas; a vacuum circuit breaker (13) housed in the container (20) and having a fixed electrode (30) and a movable electrode (31); a first member (4) disposed to surround movable parts (33, 34, 6) for moving the movable electrode (31); and a second member (3) connected to the first member (4) and disposed to surround the movable parts (33, 34, 6). The second member (3) has a threaded part (14a) formed on an inner side surface of a recess (17) that serves as a joint (29) with the first member (4). The first member (4) has a second threaded part (14b) formed on an outer peripheral side surface of a protruding shape (18) that protrudes toward the recess (17). The first member (4) and the second member (3) are fastened together by screwing the first threaded part (14a) and the second threaded part (14b).

Description

Gas-insulated switchgear

[0001] The present disclosure relates to a gas-insulated switchgear.

[0002] A gas-insulated switchgear is a compact switchgear in which devices such as a circuit breaker and a disconnector are housed in a container filled with an insulating gas having high insulation performance, such as sulfur hexafluoride (SF ６ 6) gas. The gas-insulated switchgear contributes to reducing the space in the electrical room by miniaturizing the devices due to the excellent insulation performance of the enclosed insulating gas. On the other hand, although SF ６ 6 gas has high insulation performance, its global warming potential (GWP) is large. Therefore, in recent years, insulating gases that replace SF ６ 6 have been studied. When changing the insulating medium enclosed in the container to one with a low GWP and suppressing an increase in the volume of the container, it is necessary to increase the pressure of the insulating medium to be enclosed in order to enhance the insulation performance.

[0003] However, in a conventional gas-insulated switchgear, when the pressure of the insulating gas filled in the container is increased and the gas pressure around the vacuum circuit breaker is raised, the pressure difference between the inside and outside of the bellows of the vacuum circuit breaker becomes large, and the operating energy when operating the vacuum circuit breaker increases by the increased amount of the gas pressure. Therefore, in order to reduce the pressure difference acting between the inside and outside of the bellows of the vacuum circuit breaker, the space in the inner periphery of the insulating cylinder provided between the fixed-side case and the movable-side case that supports the vacuum circuit breaker and the space in the inner periphery of the movable-side case are made into a space that is airtight and communicates with the equipment room, and this space is filled with a low-pressure insulating gas, while the other spaces are filled with a high-pressure insulating gas. A gas-insulated switchgear having a double-pressure structure has been proposed (see, for example, Patent Document 1).

[0004] Japanese Patent Application Laid-Open No. 2017-60244

[0005] In the conventional gas-insulated switchgear described above, when two pressure compartments are provided—a high-pressure compartment to ensure insulation performance and a low-pressure compartment to protect the bellows of the vacuum circuit breaker—it is necessary to have a structure that allows the partition wall components constituting the low-pressure compartment to be divided so that the components of the movable part of the circuit breaker can be installed in the low-pressure compartment. However, in the conventional gas-insulated switchgear disclosed in the aforementioned Patent Document 1, due to the structure of the divisible partition wall components, it is necessary to provide a sufficient area on the outer circumference of the partition wall components constituting the low-pressure compartment so that the partition wall components can be fastened together by bolts or the like, and the material of the partition wall components must be made thicker. As a result, the conventional gas-insulated switchgear disclosed in the aforementioned Patent Document 1 has the problem of increased dimensions in the outer diameter and height directions of the partition wall components.

[0006] This disclosure provides technology to solve the above-mentioned problems and aims to provide a miniaturized gas-insulated switchgear.

[0007] The gas-insulated switchgear of the present disclosure comprises a container filled with insulating gas, a vacuum circuit breaker housed in the container and having a fixed electrode and a movable electrode, a first member arranged to surround a movable part for moving the movable electrode, and a second member connected to the first member and arranged to surround the movable part, wherein the second member has a first threaded portion formed on the inner side surface of a recess that forms a joint with the first member, and the first member has a second threaded portion formed on the outer peripheral side surface of a convex shape that protrudes toward the recess side, and the first member and the second member are fastened together by screwing the first threaded portion and the second threaded portion together.

[0008] According to the gas-insulated switchgear of this disclosure, a miniaturized gas-insulated switchgear can be obtained.

[0009] This is a cross-sectional view showing the entire circuit breaker of a gas-insulated switchgear according to Embodiment 1. This is an enlarged cross-sectional view of the interrupting portion of the entire circuit breaker shown in Figure 1. This is an enlarged cross-sectional view of the movable portion of the circuit breaker shown in Figure 2. This is a cross-sectional view showing the entire circuit breaker of a gas-insulated switchgear according to Embodiment 2. This is an enlarged cross-sectional view of the interrupting portion of the entire circuit breaker shown in Figure 4. This is an enlarged cross-sectional view of the movable portion of the circuit breaker shown in Figure 5.

[0010] The gas-insulated switchgear according to Embodiment 1 will be described below with reference to the drawings. In each drawing, the same reference numerals indicate the same or equivalent part.

[0011] Embodiment 1. Figure 1 is a cross-sectional view showing the entire circuit breaker of a gas-insulated switchgear according to Embodiment 1. Figure 2 is an enlarged cross-sectional view of the interrupting section of the entire circuit breaker shown in Figure 1, and Figure 3 is an enlarged cross-sectional view of the movable section of the circuit breaker shown in Figure 2. As shown in Figure 1, the gas-insulated switchgear 50 of Embodiment 1 is formed of an interrupting section 41 and an operating mechanism section 24. The interrupting section 41 is housed in a pressure vessel 20 having pressure vessel flanges 21 and 22 at both ends. The driving force of the operating mechanism section 24 is transmitted to the interrupting section 41 via a rod 36. The movable shaft 6 of a vacuum interrupter 13 is attached to the upper part of the rod 36. The movable shaft 6 is connected to a movable-side conductor 34 via a connecting component 35a.

[0012] The movable conductor 34 is connected to the movable conductor 33, which passes through the inside of the bellows 15 provided on the vacuum interrupter 13. In other words, the movable conductor 33 is connected to the movable conductor 34 on the outside of the vacuum interrupter 13. The movable conductor 34 connects the movable conductor 33, which passes through the inside of the bellows 15 provided on the vacuum interrupter 13, to the connecting component 35a. The movable conductor 33 also includes conductors that do not pass through the inside of the bellows 15. A movable electrode 31 is attached to the tip of the movable conductor 33. The connecting component 35a connects the movable electrode 31 to a rod 36 that leads to the operating mechanism 24 by passing a pin 35b through the circular part. The movable part of the circuit breaker of the vacuum interrupter 13 is formed by the movable conductors 33, 34, the connecting component 35a, and the movable shaft 6.

[0013] A movable electrode 31 is attached to the tip of the movable part of the circuit breaker of the vacuum interrupter 13. A fixed electrode 30 is attached to the tip of the fixed shaft 32 of the vacuum interrupter 13, and current is switched on and off at the interruption section 41 by the contact and separation of this fixed electrode 30 and the movable electrode 31. The fixed shaft 32 of the vacuum interrupter 13 is connected to the fixed-side conductor 28 and the main circuit conductor 26, and the movable part of the circuit breaker of the vacuum interrupter 13, including the movable-side conductor 34, is connected to the main circuit conductor 25 via the energized contact part 16 and the partition part 3, and is electrically conductive. The path through which the system current flows is the path of the main circuit conductor 26, fixed-side conductor 28, fixed shaft 32, fixed electrode 30, movable electrode 31, movable-side conductors 33 and 34, energized contact part 16, partition part 3, and main circuit conductor 25.

[0014] As shown in Figures 1 and 2, in the gas-insulated switchgear 50, the movable part of the circuit breaker, including the movable shaft 6, is connected to the pressure vessel 20 through a cavity inside the insulator 5. The movable part of the circuit breaker is covered by a partition component 3 connected to the insulator 5, a partition component 4 connected to the partition component 3, and a vacuum interrupter 13 connected to the partition component 4. As shown in Figure 2, the insulator 5 is provided with a gas seal groove 9. The partition component 3 is also provided with a gas seal groove 7, and the partition component 4 is provided with a gas seal groove 8. Gas seal materials such as O-rings are housed in the gas seal grooves 7, 8, and 9.

[0015] As shown in Figure 1, the connections between the pressure vessel 20, insulator 5, partition component 3, partition component 4, vacuum interrupter 13, and bellows 15 are each sealed and separated into a high-pressure gas compartment 1 and a low-pressure gas compartment 2. As shown in Figure 3, partition component 3 and partition component 4 are fastened together by a first threaded portion 14a of partition component 3 and a second threaded portion 14b of partition component 4. The first threaded portion 14a is, for example, a female thread, and the second threaded portion 14b is, for example, a male thread. Furthermore, partition component 3 and partition component 4 have the function of separating the high-pressure gas compartment 1 and the low-pressure gas compartment 2 inside the pressure vessel 20. In addition, partition component 3 and partition component 4 are made of a highly conductive material such as aluminum or copper in order to provide electrical conductivity from the fixed-side conductor 28 to the vacuum interrupter 13. As shown in Figures 1 and 2, the insulator 5 is fastened to the low-pressure gas compartment flange 23 of the pressure vessel 20 by bolts at a fastening portion 10 located at the bottom of the insulator 5. The bulkhead component 3 is fixed by fastening to the insulator 5 by bolts at a fastening portion 11 located at the top of the insulator 5. The bulkhead component 4 and the vacuum interrupter 13 are fastened together by bolts at a fastening portion 12.

[0016] As shown in Figure 3, a recess 17 is formed in the upper center of the bulkhead component 3, and a gas seal groove 7 is formed on the bottom surface of the recess 17, surrounding the opening through which the movable shaft 6 and the energized contact portion 16 slide. Furthermore, the bulkhead component 3 has a first threaded portion 14a, which is, for example, a female thread, cut in the circumferential direction, on the outer side of the outer diameter of the gas seal groove 7 and on the inner side surface of the recess 17 of the bulkhead component 3. Here, the circumferential direction is the direction of rotation that completes one revolution around the movable part of the circuit breaker, including the movable shaft 6. The bulkhead component 4 has a convex shape 18 that protrudes downward toward the recess 17, which forms the joint portion 29 with the bulkhead component 3, and a second threaded portion 14b, which is, for example, a male thread, cut in the circumferential direction, is formed on the outer peripheral side surface of the convex shape 18 of the bulkhead component 4. The first threaded portion 14a of the bulkhead component 3 and the second threaded portion 14b of the bulkhead component 4 are interlocked and attached, and the bulkhead component 4 is formed by fastening together with the upper fixed side of the vacuum interrupter 13. The vacuum interrupter 13, bulkhead component 4, and bulkhead component 3 are provided in contact with the pressure vessel 20 via insulators 5 and 27 and are supported by the insulators 5 and 27.

[0017] In the gas-insulated switchgear 50 according to Embodiment 1, the inside of the pressure vessel 20 is filled with insulating gas. The insulating gas is, for example, dry air containing nitrogen and oxygen, and has a global warming potential of 0. As shown in Figures 1 and 3, the area within the vacuum interrupter 13 is a vacuum region 40 except for the area where the bellows 15 is provided. The internal space of the bellows 15, the first space 37 covered by the partition component 4, the second space 38 covered by the partition component 3, the cavity region inside the insulator 5, and the internal space surrounded by the low-pressure gas compartment flange 23 and the pressure vessel flange 21 are all in communication and constitute the low-pressure gas compartment 2. The first space 37 and the second space 38 also include the space of the opening through which the movable part of the circuit breaker, including the movable shaft 6, slides. The area where the operating mechanism 24 is located is an atmospheric pressure space region 39. In the gas-insulated switchgear 50 according to Embodiment 1, the area inside the pressure vessel 20 other than the low-pressure gas compartment 2 is the high-pressure gas compartment 1. The high-pressure gas compartment 1 and the low-pressure gas compartment 2 are filled with gases of the same GWP value but with different pressures. For example, the pressure in the high-pressure gas compartment 1 is in the range of 0.6 MPaG or more and less than 1.0 MPaG in gauge pressure, and the pressure in the low-pressure gas compartment 2 is in the range of 0.1 MPaG or more and 0.3 MPaG or less in gauge pressure. However, the high-pressure gas compartment 1 only needs to be filled with a gas that has a higher pressure and higher insulation performance than the low-pressure gas compartment 2, and is not limited to the pressure ranges of the high-pressure gas compartment 1 and low-pressure gas compartment 2 described above.

[0018] [Opening and Closing Operation of Gas-Insulated Switchgear 50] The opening and closing operation of the gas-insulated switchgear 50 is performed by the operation of the operating mechanism 24, which causes the movable shaft 6 and the energized contact portion 16 to slide, and the movable electrode 31 and movable-side conductor 33 of the vacuum interrupter 13 connected to the movable shaft 6 and the energized contact portion 16 to slide. When the vacuum interrupter 13 is closed, the movable shaft 6, the energized contact portion 16, the movable-side conductors 33 and 34, and the movable electrode 31 slide in the upward direction in Figures 1 and 2. When the vacuum interrupter 13 is opened, the movable shaft 6, the energized contact portion 16, the movable-side conductors 33 and 34, and the movable electrode 31 slide in the downward direction in Figures 1 and 2. The bellows 15 also expands and contracts in accordance with the opening and closing operation.

[0019] When the polarity is closed, if the energized contact portion 16 slides upward in the direction shown in Figures 1 and 2, the energized contact portion 16 slides along the partition wall component 3. After the polarity closing operation is completed, the energized contact portion 16 is located near the upper side inside the partition wall component 3. The partition wall component 3 has a length greater than the opening and closing operation stroke of the vacuum interrupter 13, so the energized contact portion 16 does not reach the partition wall component 4. A slight step is created at the joint 29 between partition wall component 3 and partition wall component 4 due to the need to connect the two components. In the gas-insulated switchgear 50 according to Embodiment 1, since the energized contact portion 16 operates only along the inside of the partition wall component 3 during opening and closing operations, even if a step is created between partition wall component 3 and partition wall component 4, for example, the energized contact portion 16 will not get caught on the step between partition wall component 3 and partition wall component 4, and its sliding will not be hindered. In other words, the inner cylindrical portion of the bulkhead component 3 has the dimensions necessary for the electrically conductive contact portion 16 to slide and for the vacuum interrupter 13 to open and close, but the electrically conductive contact portion 16 does not reach the bulkhead component 4, and the structure is such that when the electrically conductive contact portion 16 slides, it does not come into contact with the joint portion 29 of the bulkhead component 3 and the bulkhead component 4.

[0020] As shown in Figure 3, the gas-insulated switchgear 50 according to Embodiment 1 is equipped with a first threaded portion 14a and a second threaded portion 14b on the main bodies of the partition wall component 3 and the partition wall component 4, respectively, which constitute a screw fastening structure. Therefore, the partition wall component 3 and the partition wall component 4 can be fastened together without using fastening components such as bolts. Consequently, there is no need to secure an area on the outer circumference of the partition wall component 3 and the partition wall component 4 where holes for screw fastening can be provided. The diameter of the partition wall component 4 can be reduced within a range that satisfies the electric field conditions near the outside of the partition wall component 4, and by miniaturizing the shut-off section 41, the gas-insulated switchgear 50 can be miniaturized.

[0021] In conventional gas-insulated switchgear circuit breakers, after fastening the partition wall component to the insulator, it was necessary to fasten the partition wall component to itself by inserting bolts into screw fastening holes provided on the outer circumference of the partition wall component. In the gas-insulated switchgear 50 according to Embodiment 1, bolt fastening between partition wall component 3 and partition wall component 4 is unnecessary, thus reducing the number of parts. Furthermore, in the gas-insulated switchgear 50 according to Embodiment 1, after fastening partition wall component 3 and partition wall component 4, partition wall component 4 can be fastened together with the upper fixed side of the vacuum interrupter 13, thus shortening or streamlining the assembly work.

[0022] As described above, the gas-insulated switchgear 50 according to Embodiment 1 comprises a pressure vessel 20 which is a container filled with insulating gas, a vacuum interrupter 13 which is a vacuum circuit breaker housed in the vessel and having a fixed electrode 30 and a movable electrode 31, a partition wall component 4 which is a first member arranged to surround the movable part of the circuit breaker which is a movable part for moving the movable electrode 31, and a partition wall component 3 which is a second member arranged to be connected to the first member so as to surround the movable part. The partition wall component 3, which is the second member, has a first threaded portion 14a formed on the inner side surface of a recess 17 which is a joint 29 with the partition wall component 4, which is the first member, has a second threaded portion 14b formed on the outer circumferential side surface of a convex shape 18 which is formed to protrude toward the recess 17, and the first member and the second member are fastened together by screwing the first threaded portion 14a and the second threaded portion 14b together.

[0023] Furthermore, according to the gas-insulated switchgear 50 of Embodiment 1, the movable part, which is the movable part of the circuit breaker, is covered by a partition wall component 4, which is a first member, a partition wall component 3, which is a second member, and a vacuum interrupter 13, which is a vacuum circuit breaker. Moreover, according to the gas-insulated switchgear 50 of Embodiment 1, the partition wall component 4, which is the first member, has a first space 37 that houses the movable part, which is the movable part of the circuit breaker, and the partition wall component 3, which is the second member, has a second space 38 that communicates with the first space 37. Furthermore, according to the gas-insulated switchgear 50 of Embodiment 1, the vacuum interrupter 13, which is a vacuum circuit breaker, is provided with a bellows 15 so as to surround the movable part, and the insulating gas contains a first gas and a second gas having different pressures, and the internal space of the bellows 15, the first space 37 and the second space 38 are filled with the second gas, which has a lower pressure than the first gas that is filled inside the pressure vessel 20, which is a container, and around the outer periphery of the vacuum interrupter 13, which is a vacuum circuit breaker, the first component, the partition wall component 4 and the second component, the partition wall component 3. Here, the first gas is the insulating gas filled in the high-pressure gas compartment 1, and the second gas is the insulating gas filled in the low-pressure gas compartment 2.

[0024] Furthermore, in the gas-insulated switchgear 50 according to Embodiment 1, the first component, the partition wall component 4, the second component, the partition wall component 3, and the vacuum interrupter 13, which is a vacuum circuit breaker, are supported by an insulator 5 provided in contact with the container, and the container, the pressure vessel 20, and the insulator 5, the insulator 5 and the second component, the partition wall component 3, and the first component, the partition wall component 4, and the vacuum interrupter 13, are sealed by fastening parts 10, 11, and 12, respectively. In addition, in the gas-insulated switchgear 50 according to Embodiment 1, a gas seal groove 7 is provided on the bottom surface of the recess 17. As a result, in the gas-insulated switchgear 50 according to Embodiment 1, the gas-insulated switchgear 50 can be miniaturized by miniaturizing the shut-off section 41.

[0025] Embodiment 2. Figure 4 is a cross-sectional view showing the entire circuit breaker of the gas-insulated switchgear according to Embodiment 2. Figure 5 is an enlarged cross-sectional view of the interrupting section of the entire circuit breaker shown in Figure 4, and Figure 6 is an enlarged cross-sectional view of the movable section of the circuit breaker shown in Figure 5. In Figures 4 to 6, components with the same reference numerals as those used to describe the gas-insulated switchgear 50 according to Embodiment 1 indicate the same or corresponding components, and their explanation is omitted.

[0026] The following describes the gas-insulated switchgear 50 according to Embodiment 2, focusing on the differences from Embodiment 1. In the gas-insulated switchgear 50 according to Embodiment 1, a recess 17 is provided on the upper part of the partition wall component 3, which is the second member, and a first threaded portion 14a, which is, for example, a female threaded portion, is provided on the inner circumferential surface of the recess 17. Furthermore, in the gas-insulated switchgear 50 according to Embodiment 1, a convex shape 18 is provided on the lower part of the partition wall component 4, which is the first member, and a second threaded portion 14b, which is, for example, a male threaded portion, is provided on the outer circumferential surface of the convex shape 18. In the gas-insulated switchgear 50 according to Embodiment 1, the partition wall component 4, which is the first member, and the partition wall component 3, which is the second member, are fastened together by interlocking the first threaded portion 14a and the second threaded portion 14b.

[0027] On the other hand, as shown in Figure 6, in the gas-insulated switchgear 50 according to Embodiment 2, the upper part of the first component, the partition wall part 3, is made into a convex shape 45, a gas seal groove 7 is provided on the outer circumference of the opening on the top surface of the convex shape 45, and a second threaded portion 14d, for example, a male threaded portion, is formed on the outer surface of the convex shape 45, cut in the circumferential direction. Furthermore, in the gas-insulated switchgear 50 according to Embodiment 2, a recess 44 is provided at the lower part of the second component, the partition wall part 4, and a first threaded portion 14c, for example, a female threaded portion, is formed on the inner surface of the recess 44, cut in the circumferential direction. In the gas-insulated switchgear 50 according to Embodiment 2, the first component, the partition wall part 3, and the second component, the partition wall part 4, are fastened together by interlocking the first threaded portion 14c and the second threaded portion 14d.

[0028] In the gas-insulated switchgear 50 according to Embodiment 1, the joint portion 29 of the partition wall component 3 and partition wall component 4 is located on the extension of the sliding portion of the energized contact portion 16. In the gas-insulated switchgear 50 according to Embodiment 2, the energized contact portion 16 of the movable shaft 6, which is the movable part of the circuit breaker, slides only on the inner cylindrical surface of the partition wall component 3 and does not pass through the joint portion 29 of the partition wall component 3 and partition wall component 4, so it can slide smoothly to the opening at the top of the partition wall component 3. In addition, in the gas-insulated switchgear 50 according to Embodiment 1, it was necessary to set the overall height of the partition wall component 3 so that the energized contact portion 16 would not interfere with the joint portion 29 of the partition wall component 3 and partition wall component 4. On the other hand, in the gas-insulated switchgear 50 according to Embodiment 2, a second threaded portion 14d is provided on the outside of the partition wall component 3, in a position that does not affect the sliding of the energized contact portion 16. Therefore, in the gas-insulated switchgear 50 according to Embodiment 2, the overall height of the partition wall component 3 can be reduced while ensuring the same sliding distance for the energized contact portion 16 as in Embodiment 1.

[0029] As described above, the gas-insulated switchgear 50 according to Embodiment 2 comprises a pressure vessel 20 which is a container filled with insulating gas, a vacuum interrupter 13 which is a vacuum circuit breaker housed in the vessel and having a fixed electrode 30 and a movable electrode 31, a partition wall component 3 which is a first member arranged to surround the movable part of the circuit breaker which is a movable part for moving the movable electrode 31, and a partition wall component 4 which is a second member arranged to be connected to the first member so as to surround the movable part. The partition wall component 4, which is the second member, has a first threaded portion 14c formed on the inner side surface of a recess 44 which is a joint 29 with the partition wall component 3, which is the first member, and a second threaded portion 14d formed on the outer circumferential side surface of a convex shape 45 which is formed to protrude toward the recess 44 side of the partition wall component 3, which is the first member, and the partition wall component 3 and the partition wall component 4, which is the second member, are fastened together by screwing the first threaded portion 14c and the second threaded portion 14d.

[0030] Furthermore, according to the gas-insulated switchgear 50 of Embodiment 2, the movable part, which is the movable part of the circuit breaker, is covered by a partition wall component 3, which is a first member, a partition wall component 4, which is a second member, and a vacuum interrupter 13, which is a vacuum circuit breaker. Moreover, according to the gas-insulated switchgear 50 of Embodiment 2, the partition wall component 3, which is the first member, has a first space 42 that houses the movable part, which is the movable part of the circuit breaker, and the partition wall component 4, which is the second member, has a second space 43 that communicates with the first space 42. Furthermore, according to the gas-insulated switchgear 50 of Embodiment 2, the vacuum interrupter 13, which is a vacuum circuit breaker, is provided with a bellows 15 so as to surround the movable part, and the insulating gas contains a first gas and a second gas having different pressures, and the internal space of the bellows 15, the first space 42 and the second space 43 are filled with the second gas, which has a lower pressure than the first gas that is filled inside the pressure vessel 20, which is a container, and on the outer periphery of the vacuum interrupter 13, which is a vacuum circuit breaker, the first component, the partition wall component 3 and the second component, the partition wall component 4. Here, the first gas is the insulating gas filled in the high-pressure gas compartment 1, and the second gas is the insulating gas filled in the low-pressure gas compartment 2.

[0031] Furthermore, according to the gas-insulated switchgear 50 of Embodiment 2, the insulating gas is dry air containing nitrogen and oxygen, and has a global warming potential of 0. Also, according to the gas-insulated switchgear 50 of Embodiment 2, the first component, the partition wall component 3, the second component, the partition wall component 4, and the vacuum interrupter 13, which is a vacuum circuit breaker, are supported by insulators 5 that are in contact with the container, and the container, the pressure vessel 20, and the insulators 5, the insulators 5 and the first component, the partition wall component 3, the second component, the partition wall component 4, and the vacuum interrupter 13, are sealed by fastening parts 10, 11, and 12, respectively. In addition, according to the gas-insulated switchgear 50 of Embodiment 2, a gas seal groove 7 is provided on the top surface of the convex shape 45. As a result, the gas-insulated switchgear 50 of Embodiment 2 can be miniaturized by miniaturizing the shut-off section 41.

[0032] While this disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but are applicable individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are envisioned within the scope of the art disclosed in this specification. For example, these include modifying, adding or omitting at least one component, or extracting at least one component and combining it with a component from another embodiment.

[0033] 1 High-pressure gas compartment, 2 Low-pressure gas compartment, 3, 4 Partition components, 5, 27 Insulators, 6 Movable shaft, 7, 8, 9 Gas seal groove, 10, 11, 12 Fastening parts, 13 Vacuum interrupter, 14a, 14c First threaded part, 14b, 14d Second threaded part, 15 Bellows, 16 Conductive contact part, 17 Recess, 18 Convex shape, 20 Pressure vessel, 21, 22 Pressure vessel flange, 23 Low-pressure gas compartment flange, 24 Operating mechanism, 25, 26 Main circuit conductor, 28 Fixed side conductor, 29 Joint, 30 Fixed electrode, 31 Movable electrode, 32 Fixed shaft, 33, 34 Movable side conductor, 35a Connecting component, 35b Pin, 36 Rod, 37 First space, 38 Second space, 39 Atmospheric pressure space region, 40 Vacuum region, 41 Shut-off section, 42 First space, 43 Second space, 44 Recess, 45 Convex shape, 50 Gas-insulated switchgear

Claims

1. A gas-insulated switchgear comprising: a container filled with insulating gas; a vacuum circuit breaker housed in the container and having a fixed electrode and a movable electrode; a first member arranged to surround a movable part for moving the movable electrode; and a second member connected to the first member and arranged to surround the movable part, wherein the second member has a first threaded portion formed on the inner side surface of a recess that forms a joint with the first member, and the first member has a second threaded portion formed on the outer peripheral side surface of a convex shape that protrudes toward the recess side, and the first member and the second member are fastened together by screwing the first threaded portion and the second threaded portion together.

2. The gas-insulated switchgear according to claim 1, wherein the movable part is covered by the first member, the second member, and the vacuum circuit breaker.

3. The gas-insulated switchgear according to claim 1 or 2, wherein the first member has a first space for housing the movable part, and the second member has a second space communicating with the first space.

4. The gas-insulated switchgear according to claim 3, wherein the vacuum circuit breaker is provided with bellows so as to surround the movable part, the insulating gas contains a first gas and a second gas having different pressures, and the internal space of the bellows, the first space, and the second space are filled with the second gas, which has a lower pressure than the first gas that is inside the container and filled in the outer periphery of the vacuum circuit breaker, the first member and the second member.

5. The gas-insulated switchgear according to any one of claims 1 to 4, wherein the insulating gas is dry air containing nitrogen and oxygen, and has a global warming potential of 0.

6. The gas-insulated switchgear according to any one of claims 1 to 5, wherein the first member, the second member, and the vacuum circuit breaker are supported by an insulator provided in contact with the container, and the container and the insulator, the insulator and the second member, and the first member and the vacuum circuit breaker are each sealed by a fastening portion.

7. The gas-insulated switchgear according to any one of claims 1 to 6, wherein a gas seal groove is provided on the bottom surface of the recess.

8. The gas-insulated switchgear according to any one of claims 1 to 5, wherein the first member, the second member, and the vacuum circuit breaker are supported by an insulator provided in contact with the container, and the container and the insulator, the insulator and the first member, and the second member and the vacuum circuit breaker are each sealed by a fastening portion.

9. The gas-insulated switchgear according to any one of claims 1 to 5 or 8, wherein a gas seal groove is provided on the convex top surface.

Images