Gas-insulated switchgear

Abstract

Provided is a miniaturized gas-insulated switchgear (50). The gas-insulated switchgear (50) includes 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) arranged so as to surround a movable part (33, 34, 6) for moving the movable electrode (31), and a second member (3) connected to and arranged on the first member (4) so as to surround the movable part (33, 34, 6). A first screw part (14a) is formed on an inner side surface of a recess (17) serving as a joint part (29) with the first member (4) in the second member (3), and a second screw part (14b) is formed on an outer peripheral side surface of a convex shape (18) formed to protrude toward the recess (17) side in the first member (4). The first member (4) and the second member (3) are fastened by screwing the first screw part (14a) and the second screw part (14b).

Description

Technical Field

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

Background Art

[0002] A gas-insulated switchgear is a reduced-size switchgear housed in a container filled with an insulating gas such as sulfur hexafluoride (SF 6 ) gas having high insulation performance. The gas-insulated switchgear contributes to reducing the space of the electrical room by miniaturizing the equipment due to the excellent insulation performance of the enclosed insulating gas. On the other hand, although SF 6 gas has high insulation performance but a large global warming potential (GWP), in recent years, insulating gases to replace SF 6 have been studied from the viewpoint of reducing environmental impact. 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 inside 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 inside 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, and a gas-insulated switchgear having a double-pressure structure in which other spaces are filled with a high-pressure insulating gas has been proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the conventional gas-insulated switchgear described above, when two pressure compartments, i.e., a high-pressure compartment for ensuring insulation performance and a low-pressure compartment for protecting the bellows of the vacuum circuit breaker, are provided, it is necessary to have a structure in which the partition component constituting the low-pressure compartment can 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 Patent Document 1 described above, due to the structure of the partition component that can be divided, it is necessary to provide a sufficient area on the outer periphery of the partition component constituting the low-pressure compartment so that the partition components can be fastened to each other by bolt fastening or the like, and it is also necessary to increase the thickness of the material of the partition component. As a result, in the conventional gas-insulated switchgear disclosed in Patent Document 1 described above, there is a problem that the dimensions of the partition component in the outer diameter direction and the height direction increase.

[0006] The present disclosure discloses a technique for solving the above problems, and an object thereof is to provide a miniaturized gas-insulated switchgear.

Means for Solving the Problems

[0007] The gas-insulated switchgear of the present disclosure includes a container filled with an insulating gas, a vacuum circuit breaker accommodated in the container and having a fixed electrode and a movable electrode, and a movable part for moving the movable electrode It has a first space for storing, and surrounds the movable part a first member arranged to surround the movable part, It has a second space communicating with the first space, and a second member connected to and arranged around the first member so as to surround the movable part, and a first screw portion is formed on an inner side surface of a concave portion that becomes a joint portion with the first member on the second member, and a second screw portion is formed on a convex outer peripheral side surface formed to protrude toward the concave portion side on the first member, and the first member and the second member are fastened by screwing the first screw portion and the second screw portion it is provided with a bellows so as to surround the movable part. The insulating gas includes a first gas and a second gas having different pressures. The internal space of the bellows, the first space, and the second space are filled with the second gas having a lower pressure than the first gas filled in the interior of the container around the outer peripheries of the vacuum interrupter, the first member, and the second member together.

Advantages of the Invention

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

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0010] Hereinafter, the gas-insulated switchgear according to Embodiment 1 will be described with reference to the drawings. In each of the drawings, the same reference numerals indicate the same or corresponding components.

[0011] Embodiment 1. FIG. 1 is a cross-sectional view showing the entire circuit breaker of the gas-insulated switchgear according to Embodiment 1. FIG. 2 is an enlarged cross-sectional view of the interruption portion of the entire circuit breaker shown in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the movable part of the circuit breaker of the interruption portion shown in FIG. 2. As shown in FIG. 1, the gas-insulated switchgear 50 of Embodiment 1 is formed by a breaking part 41 and an operating mechanism part 24. The breaking part 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 part 24 is transmitted to the breaking part 41 via a rod 36. A 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-side conductor 34 is connected to a movable-side conductor 33 passing through the inside of a bellows 15 provided in the vacuum interrupter 13. That is, the movable-side conductor 33 is connected to the movable-side conductor 34 outside the vacuum interrupter 13. The movable-side conductor 34 connects the movable-side conductor 33 passing through the inside of the bellows 15 provided in the vacuum interrupter 13 and the connecting component 35a. The movable-side conductor 33 includes a conductor that does not pass through the inside of the bellows 15. A movable electrode 31 is attached to the tip of the movable-side conductor 33. The connecting component 35a connects the rod 36 that connects the movable electrode 31 and the operating mechanism part 24 by passing a pin 35b through a circular part. The breaker movable part of the vacuum interrupter 13 is formed by the movable-side conductors 33 and 34, the connecting component 35a, and the movable shaft 6.

[0013] A movable electrode 31 is attached to the tip of the breaker movable part of the vacuum interrupter 13. A fixed electrode 30 is attached to the tip of a fixed shaft 32 of the vacuum interrupter 13. By the contact and separation of this fixed electrode 30 and the movable electrode 31, current is input and interrupted in the breaking part 41. The fixed shaft 32 of the vacuum interrupter 13 is connected to a fixed-side conductor 28 and a main circuit conductor 26. The breaker movable part including the movable-side conductor 34 of the vacuum interrupter 13 is connected to and conducts with the main circuit conductor 25 via a current-carrying contact part 16 and a partition component 3. The path through which the system current flows is the path of the main circuit conductor 26, the fixed-side conductor 28, the fixed shaft 32, the fixed electrode 30, the movable electrode 31, the movable-side conductors 33 and 34, the current-carrying contact part 16, the partition component 3, and the main circuit conductor 25.

[0014] As shown in FIGS. 1 and 2, in the gas-insulated switchgear 50, the breaker moving part including the movable shaft 6 is connected into the pressure vessel 20 through the cavity inside the insulator 5. The breaker moving part is covered by the partition component 3 connected to the insulator 5, the partition component 4 connected to the partition component 3, and the vacuum interrupter 13 connected to the partition component 4. As shown in FIG. 2, the insulator 5 is provided with a gas seal groove 9. Further, the partition component 3 is 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 stored in the gas seal grooves 7, 8, and 9.

[0015] As shown in FIG. 1, the connection parts of the pressure vessel 20, the insulator 5, the partition component 3, the partition component 4, the vacuum interrupter 13, and the bellows 15 are each sealed and separated into a high-pressure gas compartment 1 and a low-pressure gas compartment 2. As shown in FIG. 3, the partition component 3 and the partition component 4 are fastened by the first threaded part 14a of the partition component 3 and the second threaded part 14b of the partition component 4. The first threaded part 14a is, for example, a female threaded part, and the second threaded part 14b is, for example, a male threaded part. Further, the partition component 3 and the partition component 4 have a function of separating the high-pressure gas compartment 1 and the low-pressure gas compartment 2 inside the pressure vessel 20. In addition, the partition component 3 and the partition component 4 are formed of a material with high conductivity such as aluminum or copper in order to be conductive from the fixed-side conductor 28 to the vacuum interrupter 13. As shown in FIGS. 1 and 2, the insulator 5 is fastened to the low-pressure gas compartment flange 23 of the pressure vessel 20 by bolts at the fastening part 10 provided at the lower part of the insulator 5. Further, the partition component 3 is fixed by being fastened to the insulator 5 by bolts at the fastening part 11 provided at the upper part of the insulator 5. The partition component 4 and the vacuum interrupter 13 are fastened by bolts at the fastening part 12.

[0016] As shown in FIG. 3, a concave portion 17 is formed at the upper center of the partition component 3, and a gas seal groove 7 is formed on the bottom surface of the concave portion 17 surrounding an opening through which the movable shaft 6 and the energization contact portion 16 slide. Further, on the partition component 3, a first screw portion 14a, which is, for example, a female screw portion cut in the circumferential direction, is formed on the outer side of the outer diameter of the gas seal groove 7 and on the inner side surface of the concave portion 17 of the partition component 3. Here, the circumferential direction is a direction of rotation that goes around the breaker movable part including the movable shaft 6. The partition component 4 is formed with a convex shape 18 that protrudes downward toward the concave portion 17 that becomes the joint portion 29 with the partition component 3. On the outer peripheral side surface of the convex shape 18 of the partition component 4, a second screw portion 14b, which is, for example, a male screw portion cut in the circumferential direction, is formed. The first screw portion 14a of the partition component 3 and the second screw portion 14b of the partition component 4 are engaged and attached, and the partition component 4 is formed by being clamped together when fastening the upper fixed side of the vacuum interrupter 13. The vacuum interrupter 13, the partition component 4, and the partition component 3 are provided in contact with the pressure vessel 20 via the insulators 5 and 27 and are supported by the insulators 5 and 27.

[0017] In the gas-insulated switchgear 50 according to the first embodiment, the inside of the pressure vessel 20 is filled with an 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 FIGS. 1 and 3, inside the vacuum interrupter 13, the region other than the region where the bellows 15 is provided is a vacuum region 40. 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 region of the space surrounded by the low-pressure gas partition flange 23 and the pressure vessel flange 21 communicate with each other and are the low-pressure gas partition 2. Note that the first space 37 and the second space 38 also include the space of the opening through which the breaker movable part including the movable shaft 6 slides. Also, the region where the operation mechanism unit 24 is disposed is the atmospheric pressure space region 39. In the gas-insulated switchgear 50 according to the first embodiment, inside the pressure vessel 20, the region 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 having different pressures but the same GWP value gas species, for example. 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, it is only necessary that the high-pressure gas compartment 1 is filled with a gas having a higher pressure and higher insulation performance than the low-pressure gas compartment 2, and it is not limited to the pressure ranges of the high-pressure gas compartment 1 and the low-pressure gas compartment 2 described above.

[0018] [Opening and closing operation of the gas-insulated switchgear 50] The opening and closing operation of the gas-insulated switchgear 50 is performed by the operation of the operation mechanism unit 24, causing the movable shaft 6 and the energized contact portion 16 to slide, and the movable electrode 31 and the 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 closes its contacts, the movable shaft 6, the energized contact portion 16, the movable-side conductors 33, 34, and the movable electrode 31 slide in the upward direction in FIGS. 1 and 2. When the vacuum interrupter 13 opens its contacts, the movable shaft 6, the energized contact portion 16, the movable-side conductors 33, 34, and the movable electrode 31 slide in the downward direction in FIGS. 1 and 2. Also, the bellows 15 expands and contracts according to the opening and closing operation.

[0019] When the energized contact portion 16 slides in the upward direction in FIGS. 1 and 2 at the time of closing the pole, the energized contact portion 16 slides along the partition component 3. After the closing operation is completed, the energized contact portion 16 is located near the upper side inside the partition component 3. The partition component 3 has a length greater than the opening and closing operation stroke of the vacuum interrupter 13, and the energized contact portion 16 does not reach the partition component 4. At the joint portion 29 between the partition component 3 and the partition component 4, a slight step is formed for convenience of connecting the two components. In the gas-insulated switchgear 50 according to the first embodiment, since the energized contact portion 16 operates only along the inside of the partition component 3 during the opening and closing operation, even if a step occurs between the partition component 3 and the partition component 4, for example, the energized contact portion 16 is not caught by the step between the partition component 3 and the partition component 4, and the sliding of the energized contact portion 16 is not hindered. That is, the inner cylindrical portion of the partition component 3 has dimensions necessary for the energized contact portion 16 to slide and the vacuum interrupter 13 to open and close. The energized contact portion 16 does not reach the partition component 4, and when the energized contact portion 16 slides, it does not contact the joint portion 29 between the partition component 3 and the partition component 4.

[0020] As shown in FIG. 3, the gas-insulated switchgear 50 according to the first embodiment includes a first screw portion 14a and a second screw portion 14b that respectively form a screw fastening structure on the main bodies of the partition component 3 and the partition component 4. Therefore, the partition component 3 and the partition component 4 can be fastened without using a fastening component such as a bolt. Therefore, there is no need to secure an area where holes for screw fastening can be provided in the outer peripheral portions of the partition component 3 and the partition component 4. The diameter of the partition component 4 can be reduced within a range that can satisfy the electric field conditions near the outside of the partition component 4. By miniaturizing the interrupting portion 41, the gas-insulated switchgear 50 can be miniaturized.

[0021] In the case of the breaker of the conventional gas-insulated switchgear, after fastening the partition component to the insulator, it was necessary to insert bolts into the screw fastening holes provided in the outer peripheral portions of the partition component and the partition component to fasten the partition components together. In the gas-insulated switchgear 50 according to Embodiment 1, since bolt fastening between the partition member 3 and the partition member 4 is unnecessary, the number of components can be reduced. Further, in the gas-insulated switchgear 50 according to Embodiment 1, after fastening the partition member 3 and the partition member 4, the partition member 4 can be fastened together when fastening the upper fixed side of the vacuum interrupter 13, so that the assembly work can be shortened or made more efficient.

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

[0023] Further, according to the gas-insulated switchgear 50 according to Embodiment 1, the breaker movable part which is the movable part is covered by the partition member 4 which is the first member, the partition member 3 which is the second member, and the vacuum interrupter 13 which is the vacuum circuit breaker. Furthermore, according to the gas-insulated switchgear 50 according to Embodiment 1, the partition member 4 which is the first member has a first space 37 for housing the breaker movable part which is the movable part, and the partition member 3 which is the second member has a second space 38 communicating with the first space 37. Further, according to the gas-insulated switchgear 50 according to 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. The insulating gas includes a first gas and a second gas having different pressures. The internal space of the bellows 15, the first space 37, and the second space 38 are filled with a second gas having a lower pressure than the first gas filled in the outer peripheries of the vacuum interrupter 13, which is a vacuum circuit breaker, the partition part 4, which is a first member, and the partition part 3, which is a second member, inside the pressure vessel 20, which is a container. Here, the first gas is the insulating gas filled in the high-pressure gas section 1, and the second gas is the insulating gas filled in the low-pressure gas section 2.

[0024] Furthermore, according to the gas-insulated switchgear 50 according to Embodiment 1, the partition part 4, which is a first member, the partition part 3, which is a second member, and the vacuum interrupter 13, which is a vacuum circuit breaker, are supported by an insulator 5 provided in contact with the container. The pressure vessel 20, which is a container, and the insulator 5, the insulator 5 and the partition part 3, which is a second member, and the partition part 4, which is a first member, and the vacuum interrupter 13, which is a vacuum circuit breaker, are each sealed by a fastening part 10, a fastening part 11, and a fastening part 12. Further, 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. Thereby, in the gas-insulated switchgear 50 according to Embodiment 1, by miniaturizing the interrupting part 41, the gas-insulated switchgear 50 can be miniaturized.

[0025] Embodiment 2. FIG. 4 is a cross-sectional view showing the entire circuit breaker of the gas-insulated switchgear according to Embodiment 2. FIG. 5 is an enlarged cross-sectional view of the interrupting part of the entire circuit breaker shown in FIG. 4, and FIG. 6 is an enlarged cross-sectional view of the movable part of the circuit breaker of the interrupting part shown in FIG. 5. In FIGS. 4 to 6, those denoted by the same reference numerals as those used to describe the gas-insulated switchgear 50 according to Embodiment 1 indicate the same or corresponding configurations, and the description thereof is omitted.

[0026] Hereinafter, the gas-insulated switchgear 50 according to Embodiment 2 will be described focusing on the parts different from Embodiment 1. In the gas-insulated switchgear 50 according to Embodiment 1, a concave portion 17 is provided on the upper portion of the partition component 3 which is the second member, and a first threaded portion 14a which is, for example, an internal thread portion is provided on the inner peripheral side surface of the concave portion 17. Further, in the gas-insulated switchgear 50 according to Embodiment 1, a convex shape 18 is provided on the lower portion of the partition component 4 which is the first member, and a second threaded portion 14b which is, for example, an external thread portion is provided on the outer peripheral side surface of the convex shape 18. And in the gas-insulated switchgear 50 according to Embodiment 1, the partition component 4 which is the first member and the partition component 3 which is the second member are fastened by meshing the first threaded portion 14a and the second threaded portion 14b.

[0027] On the other hand, as shown in FIG. 6, in the gas-insulated switchgear 50 according to Embodiment 2, the upper portion of the partition component 3 which is the first member is formed into a convex shape 45, a gas seal groove 7 is provided on the outer periphery of the opening on the top surface of the convex shape 45, and a second threaded portion 14d which is, for example, an external thread portion cut in the circumferential direction is formed on the outer peripheral side surface of the convex shape 45. Further, in the gas-insulated switchgear 50 according to Embodiment 2, a concave portion 44 is provided on the lower portion of the partition component 4 which is the second member, and a first threaded portion 14c which is, for example, an internal thread portion cut in the circumferential direction is formed on the inner peripheral side surface of the concave portion 44. And in the gas-insulated switchgear 50 according to Embodiment 2, the partition component 3 which is the first member and the partition component 4 which is the second member are fastened by meshing 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 component 3 and the partition component 4 is located on the extension of the sliding portion of the energization contact portion 16. In the gas-insulated switchgear 50 according to Embodiment 2, the energization contact portion 16 of the movable shaft 6 which is the breaker movable portion slides only on the inner cylindrical surface of the partition component 3 and does not pass through the joint portion 29 of the partition component 3 and the partition component 4, so that it can slide smoothly up to the opening on the upper portion of the partition 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 part 3 so that the energized contact part 16 would not interfere with the joint part 29 between the partition part 3 and the partition part 4. On the other hand, in the gas-insulated switchgear 50 according to Embodiment 2, a second screw part 14d is provided outside the partition part 3 at a position that does not affect the sliding of the energized contact part 16. Therefore, in the gas-insulated switchgear 50 according to Embodiment 2, after reducing the overall height of the partition part 3, the energized contact part 16 can secure the same sliding distance as in Embodiment 1.

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

[0030] Also, according to the gas-insulated switchgear 50 according to Embodiment 2, the breaker movable part which is the movable part is covered by the partition part 3 which is the first member, the partition part 4 which is the second member, and the vacuum interrupter 13 which is a vacuum circuit breaker. Furthermore, according to the gas-insulated switchgear 50 according to Embodiment 2, the partition part 3 which is the first member has a first space 42 for housing the breaker movable part which is the movable part, and the partition part 4 which is the second member has a second space 43 communicating with the first space 42. Further, according to the gas-insulated switchgear 50 according to the second embodiment, the vacuum interrupter 13, which is a vacuum circuit breaker, is provided with a bellows 15 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 15, the first space 42, and the second space 43 are filled with a second gas having a pressure lower than that of the first gas filled in the outer peripheral portions of the vacuum interrupter 13, which is a vacuum circuit breaker, the partition part 3, which is a first member, and the partition part 4, which is a second member, inside the pressure vessel 20, which is a container. Here, the first gas is the insulating gas filled in the high-pressure gas section 1, and the second gas is the insulating gas filled in the low-pressure gas section 2.

[0031] Furthermore, according to the gas-insulated switchgear 50 according to the second embodiment, the insulating gas is dry air containing nitrogen and oxygen, and the global warming potential is 0. Also, according to the gas-insulated switchgear 50 according to the second embodiment, the partition part 3, which is a first member, the partition part 4, which is a second member, and the vacuum interrupter 13, which is a vacuum circuit breaker, are supported by insulators 5 provided in contact with the container, and the pressure vessel 20, which is a container, the insulators 5, the partition part 3, which is a first member, the partition part 4, which is a second member, and the vacuum interrupter 13, which is a vacuum circuit breaker, are sealed by fastening parts 10, 11, and 12, respectively. Also, according to the gas-insulated switchgear 50 according to the second embodiment, a gas seal groove 7 is provided on the top surface of the convex shape 45. Thereby, the gas-insulated switchgear 50 according to the second embodiment can reduce the size of the gas-insulated switchgear 50 by reducing the size of the interrupting part 41.

[0032] Although various exemplary embodiments and examples are described in the present disclosure, the various features, aspects, and functions described in one or more of the embodiments are not limited to the application of a specific embodiment, but are applicable to the embodiments alone or in various combinations. Accordingly, countless modifications not illustrated are envisioned within the scope of the technology disclosed in this specification. For example, it shall include cases where at least one component is modified, added, or omitted, and further, cases where at least one component is extracted and combined with components of other embodiments.

Description of Reference Numerals

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

Claims

1. 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 having a first space for accommodating a movable part for moving the movable electrode and disposed so as to surround the movable part; a second member having a second space communicating with the first space and connected to the first member so as to surround the movable portion; The second member has a first threaded portion formed on an inner side surface of a recessed portion that serves as a joint with the first member, and the first member has a second threaded portion formed on an outer peripheral side surface of a convex shape that is formed to protrude toward the recessed portion, The first member and the second member are fastened by screwing the first threaded portion and the second threaded portion together, The vacuum circuit breaker is provided with a bellows surrounding the movable part, The insulating gas includes a first gas and a second gas having different pressures; the internal space of the bellows, the first space, and the second space are filled with the second gas having a pressure lower than that of the first gas filled inside the container and in the outer periphery of the vacuum circuit breaker, the first member, and the second member.

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

3. 3. The gas-insulated switchgear according to claim 1, wherein the insulating gas is dry air containing nitrogen and oxygen and has a global warming potential of zero.

4. the first member, the second member, and the vacuum interrupter are supported by an insulator provided in contact with the container; 3. The gas-insulated switchgear according to claim 1, wherein the container and the insulator, the insulator and the second member, and the first member and the vacuum circuit breaker are sealed by fastening parts, respectively.

5. 3. The gas-insulated switchgear according to claim 1, wherein a gas seal groove is provided on a bottom surface of the recess.

6. the first member, the second member, and the vacuum interrupter are supported by an insulator provided in contact with the container; 3. The gas-insulated switchgear according to claim 1, wherein the container and the insulator, the insulator and the first member, and the second member and the vacuum circuit breaker are sealed by fastening parts, respectively.

7. 3. The gas-insulated switchgear according to claim 1, wherein a gas seal groove is provided on the top surface of the convex shape.

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