Gas-insulated switchgear

Abstract

To provide a gas-insulated switchgear in which sufficient current flows through parts that move while in contact. The contact is provided with a first movable contact (19) that is provided inside the movable cylinder conductor (17), that is in contact with the movable rod (21), that is electrically connected to the movable rod (21), and that moves together with the movable rod (21) in the approaching and separating direction; and a second movable contact (20) that is provided inside the movable cylinder conductor (17), that is in contact with the first movable contact (19) and the inner surface of the movable cylinder conductor (17), that is electrically connected to the first movable contact (19), and that moves together with the movable rod (21) and the first movable contact (19) in the approaching and separating direction while in contact with the movable cylinder (17).

Description

[Technical Field]

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

[0002] Prior art discloses a gas-insulated switchgear that includes a vacuum circuit breaker installed in an equipment room and an insulating cylinder surrounding the vacuum circuit breaker, in which a low-pressure insulating gas is filled in the space inside the insulating cylinder, and a high-pressure insulating gas is filled in the space inside the equipment room, in the space outside the insulating cylinder (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-60244 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional technology, the contact area between the movable electrode and the contact is small, which has the problem that there is a possibility that the current flow in the moving part while in contact may be insufficient.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a gas-insulated switchgear in which sufficient current flows through parts that move while in contact with each other. [Means for solving the problem]

[0006] a movable-side rod at least a portion of which is provided inside the bellows and which moves in a direction in which the fixed-side electrode and the movable-side electrode move toward and away from each other; a movable-side cylinder conductor provided on the bellows side outside the vacuum valve and electrically connected to a movable-side bus conductor; a first movable contact provided inside the movable-side cylinder conductor, in contact with the movable-side rod, electrically connected to the movable-side rod, and moving in the direction in which the movable-side rod moves toward and away from each other; and a second movable contact provided inside the movable-side cylinder conductor, in contact with the first movable contact and an inner surface of the movable-side cylinder conductor, electrically connected to the first movable contact, and moving in the direction in which the movable-side rod and the first movable contact move toward and away from each other while in contact with the movable-side cylinder conductor. The pressure inside the bellows is higher than the pressure inside the vacuum valve, and the pressure inside the bellows is lower than the pressure outside the movable cylinder conductor. It is something. [Effects of the Invention]

[0007] According to the gas-insulated switchgear of the present disclosure, it is possible to ensure sufficient current flow in parts that move while in contact with each other. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a gas-insulated switchgear according to a first embodiment of the present disclosure. [Figure 2] 1 is a diagram illustrating a gas compartment of a gas-insulated switchgear according to a first embodiment of the present disclosure. [Figure 3] 1 is a perspective view of a first movable contact, a second movable contact, and a contact coupling screw according to a first embodiment of the present disclosure. FIG. [Figure 4] FIG. 2 is a perspective view of an inner conductor band according to the first embodiment of the present disclosure. [Figure 5] FIG. 2 is a perspective view of a peripheral conductor band according to the first embodiment of the present disclosure. [Figure 6] 1 is a cross-sectional view of a gas-insulated switchgear according to a first embodiment of the present disclosure. [Figure 7] FIG. 6 is a cross-sectional view of a gas-insulated switchgear according to a second embodiment of the present disclosure. [Figure 8] FIG. 10 is a cross-sectional view of a gas-insulated switchgear according to a third embodiment of the present disclosure. [Figure 9] FIG. 10 is a cross-sectional view of a gas-insulated switchgear according to a fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that the drawings are schematic, and the relative sizes and positions shown in different drawings are not necessarily limited to those described and may be changed as appropriate. In the following description, similar components are denoted by the same reference numerals, and their names and functions are assumed to be the same or similar. Therefore, detailed descriptions thereof may be omitted.

[0010] Embodiment 1 A gas-insulated switchgear 101 according to embodiment 1 will be described with reference to Fig. 1 to Fig. 6. Fig. 1 is a cross-sectional view of the gas-insulated switchgear 101 according to embodiment 1. The gas-insulated switchgear 101 includes a tank 1, an outer flange 2, an inner flange 3, an intermediate chamber 4, a seal member 5, a gas density monitor 6, a movable bus conductor 7, a fixed bus conductor 8, and a vacuum circuit breaker 201.

[0011] In Fig. 1, the upper side is the movable side and the lower side is the fixed side. The fixed side of the gas-insulated switchgear 101 does not need to be arranged vertically, and the movable side may be arranged vertically. The gas-insulated switchgear 101 may also be arranged so that the movable side and the fixed side extend horizontally. For example, a machine room (not shown) is provided at the end of the movable side of the gas-insulated switchgear 101.

[0012] The tank 1 is provided on the outer periphery of the gas-insulated switchgear 101. The outer flange 2, the inner flange 3, the gas density monitor 6, the movable bus conductor 7, the fixed bus conductor 8, and the vacuum circuit breaker 201 are housed inside the tank 1. The outer flange 2, the inner flange 3, the gas density monitor 6, the movable bus conductor 7, the fixed bus conductor 8, and the vacuum circuit breaker 201 may be provided with parts exposed from the tank 1. The tank 1 is provided in a grounded state.

[0013] The outer flange 2 is provided on the outer periphery of the gas-insulated switchgear 101. The outer flange 2 is provided on the movable side of the movable-side cylinder conductor 17. The outer flange 2 is provided, for example, as a part of the tank 1. The outer flange 2 may also be provided inside the tank 1. In other words, the tank 1 may be provided so as to surround the outer flange 2.

[0014] The outer flange 2 includes, for example, a through hole 30. A connection portion 29 of the vacuum circuit breaker 201 is passed through the through hole 30 of the outer flange 2. The outer flange 2 includes, for example, a through hole 31. A gas density monitor 6 is passed through the through hole 31 of the outer flange 2.

[0015] The inner flange 3 is provided inside the tank 1. The inner flange 3 is provided on the vacuum circuit breaker 201 side of the outer flange 2. The inner flange 3 is provided on the moving side of the moving side cylinder conductor 17. The inner flange 3 is provided between the outer flange 2 and the moving side cylinder conductor 17. The inner flange 3 is provided in partial contact with the outer flange 2, and forms an intermediate chamber 4 between itself and the outer flange 2. The inner flange 3 includes, for example, a through hole 32. The insulating rod 16 of the vacuum circuit breaker 201 is passed through the through hole 32 of the inner flange 3.

[0016] The intermediate chamber 4 is formed between the outer flange 2 and the inner flange 3. The interior of the intermediate chamber 4 is filled with gas. The intermediate chamber 4 is provided so as to be in communication with the interior of the movable-side support insulator 13 and the interior of the movable-side cylinder conductor 17.

[0017] The seal member 5 is provided between the outer flange 2 and the connection portion 29. The seal member 5 is provided to maintain the airtightness of the intermediate chamber 4. That is, by providing the seal member 5, the gas-insulated switchgear 101 can maintain the airtightness of the intermediate chamber 4 even if the connection portion 29 moves.

[0018] The gas density monitor 6 is provided and connected to the intermediate chamber 4. The gas density monitor 6 measures the gas density in the intermediate chamber 4. The gas density monitor 6 is provided, for example, on the outer flange 2. The gas density monitor 6 is provided by passing through a through-hole 32 in the outer flange 2. The gas density monitor 6 supplies gas to the intermediate chamber 4. The gas is supplied to the intermediate chamber 4 through the through-hole 32 in the outer flange 2.

[0019] The movable bus conductor 7 is electrically connected to the movable cylinder conductor 17 of the vacuum circuit breaker 201. A plurality of gas-insulated switchgears 101 are arranged, for example, side by side on a panel. A portion of the movable bus conductor 7 is exposed from the tank 1 and is connected to another gas-insulated switchgear arranged adjacently.

[0020] The fixed-side bus conductor 8 is electrically connected to the fixed-side connecting conductor 26 of the vacuum circuit breaker 201. A part of the fixed-side bus conductor 8 is exposed from the tank 1 and is connected to another adjacent gas-insulated switchgear.

[0021] The vacuum circuit breaker 201 includes an operating unit 11, a movable side support insulator 13, a filler metal 14, a filler metal 15, an insulating rod 16, a movable side cylinder conductor 17, a cylinder seal 18, a first movable contact 19, a second movable contact 20, a movable side rod 21, a vacuum valve 22, a movable side electrode 23, a fixed side electrode 24, a bellows 25, a fixed side connecting conductor 26, a fixed side support insulator 27, a connection unit 28, and a connection unit 29.

[0022] The operating unit 11 is provided on the movable side of the vacuum circuit breaker 201. The operating unit 11 is, for example, indirectly connected to the insulating rod 16. The operating unit 11 is connected to the insulating rod 16 via the connecting unit 28 and the connecting unit 29. As the operating unit 11 moves, the insulating rod 16 also moves.

[0023] The operation unit 11 is connected to the movable-side electrode 23 via, for example, a connection unit 28, a connection unit 29, an insulating rod 16, and a movable-side rod 21. As the operation unit 11 moves, the movable-side rod 21 and the movable-side electrode 23 also move. As the movable-side electrode 23 moves, the movable-side electrode 23 and the fixed-side electrode 24 can be brought from a contacting state to a non-contacting state. Furthermore, as the movable-side electrode 23 moves, the movable-side electrode 23 and the fixed-side electrode 24 can be brought from a non-contacting state to a contacting state.

[0024] The direction in which the movable electrode 23 moves and comes into contact with or separates from the fixed electrode 24 is referred to as the contact / separation direction. The direction in which the movable electrode 23 moves away from the fixed electrode 24 is referred to as the first direction, and the direction in which the movable electrode 23 moves toward the fixed electrode 24 is referred to as the second direction.

[0025] The gas-insulated switchgear 101 includes, for example, three movable electrodes and three fixed electrodes. Three-phase AC is applied to the three movable electrodes and the three fixed electrodes. The operating unit 11 is indirectly connected to the three movable electrodes and can open and close the three movable electrodes and the three fixed electrodes collectively. The operating unit 11 is provided, for example, inside a machine room (not shown).

[0026] The movable side support insulator 13 is provided inside the tank 1. The movable side support insulator 13 is provided between the movable side cylinder conductor 17 and the inner flange 3. The movable side support insulator 13 is provided, for example, in contact with the movable side cylinder conductor 17. The movable side support insulator 13 is provided, for example, in contact with the inner flange 3. The movable side support insulator 13 has a filler metal 14 on the movable side cylinder conductor 17 side. The movable side support insulator 13 has a filler metal 15 on the inner flange 3 side. An insulating rod 16 is passed through the inside of the movable side support insulator 13.

[0027] The insulating rod 16 is connected to the operating unit 11 via connection parts 28 and 29. The insulating rod 16 is connected to the movable side rod 21 and moves axially together with the movable side rod 21. The insulating rod 16 is provided inside the intermediate chamber 4. The movable side rod 21 is provided inside the movable side support insulator 13. The movable side rod 21 is provided inside the movable side cylinder conductor 17. Note that the entire movable side rod 21 does not have to be provided inside the movable side cylinder conductor 17. The axial direction is the vertical direction in FIG. 1.

[0028] The movable side cylinder conductor 17 is provided inside the tank 1. The movable side cylinder conductor 17 is provided between the movable side support insulator 13 and the vacuum valve 22. The movable side cylinder conductor 17 is provided in electrical connection with the movable side bus bar conductor 7. The movable side cylinder conductor 17 is provided in contact with the first movable contact 19. The movable side cylinder conductor 17 is provided in electrical connection with the first movable contact 19, the second movable contact 20, the movable side rod 21, and the movable side electrode 23.

[0029] The movable-side cylinder conductor 17 has, for example, a cylindrical shape including a circular cross section. The cylindrical shape of the movable-side cylinder conductor 17 can increase the withstand voltage of the movable-side cylinder conductor 17. The interior of the movable-side cylinder conductor 17 is provided so as to communicate with the interior of the intermediate chamber 4 and the movable-side support insulator 13.

[0030] The cylinder seal 18 is provided between the movable cylinder conductor 17 and the vacuum valve 22. The cylinder seal 18 is, for example, an O-ring. The cylinder seal 18 is provided inside the outermost peripheral portion in the radial direction of the vacuum valve 22. By providing the cylinder seal 18 inside the outermost peripheral portion in the radial direction of the vacuum valve 22, the possibility of damage to the bellows 25 can be reduced without extending the space communicating with the inside of the movable cylinder conductor 17 to the outside of the vacuum valve 22.

[0031] The first movable contact 19 is provided inside the movable-side cylinder conductor 17. The inner periphery of the first movable contact 19 is in contact with the movable-side rod 21. The first movable contact 19 is fixed to the movable-side rod 21. The first movable contact 19 is electrically connected to the movable-side cylinder conductor 17, the second movable contact 20, the movable-side rod 21, and the movable-side electrode 23. The first movable contact 19 moves in the axial direction together with the insulating rod 16, the second movable contact 20, the movable-side rod 21, and the movable-side electrode 23.

[0032] The second movable contact 20 is provided inside the movable-side cylinder conductor 17. The outer periphery of the second movable contact 20 is in contact with the inner surface of the movable-side cylinder conductor 17. The second movable contact 20 is electrically connected to the movable-side cylinder conductor 17, the first movable contact 19, the movable-side rod 21, and the movable-side electrode 23.

[0033] The second movable contact 20 moves while contacting the inside of the movable-side cylinder conductor 17. The second movable contact 20 moves in a sliding manner while contacting, for example, the inner surface of the movable-side cylinder conductor 17. That is, the second movable contact 20 slides against, for example, the inner surface of the movable-side cylinder conductor 17. The second movable contact 20 moves in the axial direction together with the insulating rod 16, the first movable contact 19, the movable-side rod 21, and the movable-side electrode 23.

[0034] The first movable contact 19 is fixed to the movable rod 21. Therefore, electrical continuity between the first movable contact 19 and the movable rod 21 can be easily ensured. That is, even if the contact area between the first movable contact 19 and the movable rod 21 is small, electrical continuity between the first movable contact 19 and the movable rod 21 can be sufficiently ensured. In the gas-insulated switchgear 101 according to this embodiment, the inner peripheral portion of the first movable contact 19 contacts the outer peripheral portion of the movable rod 21, thereby ensuring sufficient electrical continuity between the first movable contact 19 and the movable rod 21.

[0035] On the other hand, the second movable contact 20 is not fixed to the movable-side cylinder conductor 17, but is provided so as to move while in contact with it. Therefore, it is more difficult to ensure electrical continuity between the second movable contact 20 and the movable-side cylinder conductor 17 than when they are fixed. In the gas-insulated switchgear 101 according to this embodiment, the outer periphery of the second movable contact 20 comes into contact with the inner surface of the movable-side cylinder conductor 17, thereby ensuring a larger contact area than in the conventional art, where electrical continuity is achieved between the inner periphery of the second movable contact 20 and a conductor or the like that moves in contact with the inner periphery of the second movable contact 20, and therefore electrical continuity can be sufficiently ensured.

[0036] For example, the size of the first movable contact 19 in a direction different from the extension direction of the movable-side rod 21 is smaller than the size of the second movable contact 20 in the direction different from the extension direction of the movable-side rod 21. In other words, when comparing the sizes of the first movable contact 19 in a direction different from the extension direction of the movable-side rod 21, the first movable contact 19 is smaller than the second movable contact 20.

[0037] The radial size of the first movable contact 19 is smaller than the radial size of the second movable contact 20 .

[0038] The extension direction of the movable-side rod 21 is the direction in which the movable-side rod 21 extends. The extension direction of the movable-side rod 21 is the up-and-down direction in FIG. 1. The extension direction of the movable-side rod 21 is the axial direction. That is, the axial direction is the up-and-down direction in FIG. 1. The direction perpendicular to the axial direction is the radial direction. A direction different from the extension direction of the movable-side rod 21 is, for example, a direction perpendicular to the extension direction of the movable-side rod 21. A direction different from the extension direction of the movable-side rod 21 is, for example, the radial direction of the cross section of the movable-side cylinder conductor 17, which is circular. The circumferential direction is the circumferential direction of the cross section of the movable-side cylinder conductor 17, which is circular.

[0039] Since the radial size of the first movable contact 19 is smaller than the radial size of the second movable contact 20, when the interior of the vacuum valve 22 side of the movable side cylinder conductor 17 or the interior of the vacuum valve 22 side of the movable side cylinder conductor 17 is narrower than the part where the second movable contact 20 moves while making contact, the first movable contact 19 can enter the narrower interior of the vacuum valve 22 side of the movable side cylinder conductor 17 or the interior of the vacuum valve 22 side of the movable side cylinder conductor 17, so that the axial size of the movable side cylinder conductor 17 can be reduced and the vacuum circuit breaker 201 and gas-insulated switchgear 101 can be made smaller.

[0040] The first movable contact 19 and the second movable contact 20 may be integrally formed or may be provided as separate bodies.

[0041] The movable side rod 21 is electrically connected to the first movable contact 19 and the movable side electrode 23. The movable side rod 21 is provided in contact with the inner peripheral portion of the first movable contact 19. At least a portion of the movable side rod 21 is provided inside the bellows 25 of the vacuum valve 22. The movable side rod 21 is provided so as to protrude from the vacuum valve 22. The movable side rod 21 moves in the axial direction. The movable side rod 21 moves in a direction in which the movable side electrode 23 and the fixed side electrode 24 move toward and away from each other.

[0042] The vacuum valves 22 are provided in a three-phase arrangement inside the tank 1 of the gas-insulated switchgear 101. The vacuum valves 22 are fixed to the tank 1 via movable-side support insulators 13. The vacuum valves 22 are fixed on the fixed side to the tank 1 via fixed-side support insulators 27. The vacuum valves 22 are insulated from the tank 1 by the movable-side support insulators 13 and the fixed-side support insulators 27.

[0043] The vacuum valve 22 has, for example, a cylindrical shape. Inside the vacuum valve 22, a movable electrode 23, a fixed electrode 24, and a bellows 25. The inside of the vacuum valve 22, except for the inside of the bellows 25, is in a vacuum state or a near-vacuum state.

[0044] The movable side electrode 23 is disposed inside the vacuum interrupter 22. The movable side electrode 23 is provided inside the vacuum interrupter 22 on the bellows 25 side. The movable side electrode 23 is provided inside the vacuum interrupter 22 on the movable side cylinder conductor 17 side. The movable side electrode 23 is provided fixed to the movable side rod 21. The movable side electrode 23 moves in the axial direction together with the movable side rod 21. The movable side electrode 23 is electrically connected to the movable side rod 21. The movable side rod 21 and the movable side electrode 23 may be provided separately or integrally. The movable side electrode 23 is provided in contact with the fixed side electrode 24 when the vacuum interrupter 201 is in the closed state. The movable side electrode 23 is provided without contacting the fixed side electrode 24 when the vacuum interrupter 201 is in the open state. The movable side electrode 23 moves toward and away from the fixed side electrode 24. The movable side electrode 23 moves in the approaching and separating direction. The movable electrode 23 includes a movable contact.

[0045] The fixed side electrode 24 is disposed inside the vacuum interrupter 22. The fixed side electrode 24 is provided inside the vacuum interrupter 22 at a position facing the bellows 25. The fixed side electrode 24 is provided inside the vacuum interrupter 22 on the opposite side from the movable side cylinder conductor 17. The fixed side electrode 24 is provided fixed to the fixed side connecting conductor 26. The fixed side electrode 24 is electrically connected to the fixed side connecting conductor 26. The fixed side electrode 24 is provided in contact with the movable side electrode 23 when the vacuum interrupter 201 is in the closed state. The fixed side electrode 24 is provided without contacting the movable side electrode 23 when the vacuum interrupter 201 is in the open state. The fixed side electrode 24 includes a fixed contact. The movable side electrode 23 and the fixed side electrode 24 contact each other at the movable contact and the fixed contact.

[0046] The bellows 25 is provided inside the vacuum valve 22. The bellows 25 is provided inside the vacuum valve 22 at a position opposite the fixed side electrode 24. The bellows 25 is provided inside the vacuum valve 22 on the movable side cylinder conductor 17 side. The bellows 25 is a member made of a metal plate shaped like a bellows. The movable side rod 21 is provided inside the bellows 25. The movable side electrode 23 may also be provided inside the bellows 25. The movable side rod 21 moves in the axial direction inside the bellows 25. The outside of the bellows 25 is provided in a vacuum state. The inside of the bellows 25 is provided so that it is in communication with the inside of the movable side cylinder conductor 17.

[0047] The fixed-side connecting conductor 26 is provided inside the tank 1. The fixed-side connecting conductor 26 is provided on the opposite side of the fixed-side electrode 24 from the vacuum interrupter 22. The fixed-side connecting conductor 26 is electrically connected to the fixed-side busbar conductor 8 and the fixed-side electrode 24. The fixed-side connecting conductor 26 is provided between the vacuum interrupter 22 and the fixed-side supporting insulator 27.

[0048] The fixed-side support insulator 27 is provided on the fixed side of the fixed-side connecting conductor 26. The fixed-side support insulator 27 is provided fixedly inside the tank 1.

[0049] Fig. 2 is a diagram showing gas compartments of the gas-insulated switchgear 101 according to the first embodiment. The interior of the gas-insulated switchgear 101 is divided into a vacuum region 41, a low-pressure region 42, and a high-pressure region 43. The gas-insulated switchgear 101 has a dual-pressure structure in which a low-pressure region 42 and a high-pressure region 43 are provided in addition to the vacuum region 41 inside the vacuum valve 22. In Fig. 2, the vacuum region 41 is indicated by a dotted line of about 5%, the low-pressure region 42 by a dotted line of about 20%, and the high-pressure region 43 by a dotted line of about 40%.

[0050] The inside of the tank 1 of the gas-insulated switchgear 101 is filled with a gas with excellent insulating performance in order to shorten the insulation distance. The vacuum region 41 is inside the vacuum valve 22 and outside the bellows 25. The pressure in the vacuum region 41 is lower than the pressures in the low-pressure region 42 and the high-pressure region 43.

[0051] The low-pressure region 42 includes the intermediate chamber 4, the interior of the movable-side support insulator 13, the interior of the movable-side cylinder conductor 17, and the interior of the bellows 25. The intermediate chamber 4, the interior of the movable-side support insulator 13, the interior of the movable-side cylinder conductor 17, and the interior of the bellows 25 are connected to each other. The pressure in the low-pressure region 42 is higher than the pressure in the vacuum region 41. The pressure in the low-pressure region 42 is lower than the pressure in the high-pressure region 43.

[0052] The gas-insulated switchgear 101 can be provided with a low-pressure region 42 by including the movable-side cylinder conductor 17. Also, by providing the outer flange 2 and inner flange 3 that form the intermediate chamber 4, which is the low-pressure region 42, on the outer periphery of the gas-insulated switchgear 101, the low-pressure region 42 can be easily filled with gas, and the pressure in the low-pressure region 42 can be easily measured.

[0053] The high-pressure region 43 is a region of the gas-insulated switchgear 101 other than the vacuum region 41 and the low-pressure region 42. The high-pressure region 43 is a region outside the intermediate chamber 4, the movable-side support insulator 13, the movable-side cylinder conductor 17, and the vacuum valve 22. The pressure in the high-pressure region 43 is higher than the pressure in the vacuum region 41 and the low-pressure region 42.

[0054] Fixed seals or sliding seals are provided at the boundaries between the vacuum region 41, the low-pressure region 42, and the high-pressure region 43. The fixed seals and sliding seals are, for example, O-rings. For example, fixed seals are used in locations where the positional relationship with the contacting member does not change, and sliding seals are used in locations where the positional relationship with the contacting member changes, such as bolt fastening parts. The fixed seals are, for example, placed in grooves formed in flanges or the like and provided integrally with the flanges or the like. The sliding seals are, for example, provided as separate bodies from the contacting members.

[0055] The interior of bellows 25 is low-pressure region 42, and the region outside bellows 25 that is in direct contact with bellows 25 is vacuum region 41. The interior of bellows 25 is in contact with low-pressure region 42, and the exterior is in contact with vacuum region 41. In other words, bellows 25 is not in direct contact with high-pressure region 43. If low-pressure region 42 were not provided, the interior of bellows 25 would be in contact with high-pressure region 43, and the exterior would be in contact with vacuum region 41, which could result in damage to bellows 25 due to the pressure difference between the interior and exterior.

[0056] Furthermore, in recent years, in consideration of environmental issues caused by the use of sulfur hexafluoride, a gas with high insulating properties that has been used to fill the high-pressure region 43, gases with lower insulating properties than sulfur hexafluoride are sometimes used instead of sulfur hexafluoride. When a gas with lower insulating properties is used, it is necessary to increase the pressure in the high-pressure region 43, which may increase the pressure difference between the inside and outside of the bellows 25. The bellows 25 of the gas-insulated switchgear 101 has its interior in contact with the low-pressure region 42 and its exterior in contact with the vacuum region 41, thereby reducing the possibility of the bellows 25 being damaged by the pressure difference between the inside and outside.

[0057] Fig. 3 is a perspective view of the first movable contact 19, the second movable contact 20, and the contact coupling screw 44 included in the gas-insulated switchgear 101 according to the first embodiment. As shown in Fig. 3, the first movable contact 19 and the second movable contact 20 are provided integrally.

[0058] The gas-insulated switchgear 101 includes a first movable contact 19, a second movable contact 20, and a contact coupling screw 44. The first movable contact 19 includes an inner peripheral portion 45 of the first movable contact, an inner peripheral conductive band 46, an inner peripheral conductive band 47, a coupling hole 48 of the first movable contact, and an outer peripheral portion 49 of the first movable contact. The inner peripheral conductive band 46 and the inner peripheral conductive band 47 are provided on the inner peripheral portion 45 of the first movable contact. The first movable contact 19 is, for example, cylindrical in shape.

[0059] The inner circumferential conductor band 46 and the inner circumferential conductor band 46 are provided in a band shape on the inner circumferential portion 45 of the first movable contact. The inner circumferential conductor band 46 and the inner circumferential conductor band 46 are provided, for example, continuously in the circumferential direction. Note that the inner circumferential conductor band 46 and the inner circumferential conductor band 46 may be provided on the inner circumferential portion 45 of the first movable contact with some discontinuities.

[0060] The first movable contact 19 has, for example, two inner circumferential conductive bands on the inner circumferential portion 45 of the first movable contact. Note that the number of inner circumferential conductive bands on the inner circumferential portion 45 of the first movable contact is not limited to two, and may be one, or three or more.

[0061] The second movable contact 20 includes an outer periphery 50 of the second movable contact, an outer periphery conductive band 51, an outer periphery conductive band 52, a guide 53, a guide 54, and a through hole 55. The outer periphery conductive bands 51 and 52 are provided on the outer periphery 50 of the second movable contact. The second movable contact 20 has, for example, a cylindrical shape.

[0062] The peripheral conductor bands 51 and 52 are provided in a band shape on the outer periphery 50 of the second movable contact. The peripheral conductor bands 51 and 52 are provided, for example, continuously in the circumferential direction. Note that the peripheral conductor bands 51 and 52 may be provided on the outer periphery 50 of the second movable contact with some discontinuities.

[0063] The second movable contact 20 has, for example, two outer circumferential conductive bands on the outer circumferential portion 50 of the second movable contact. Note that the number of outer circumferential conductive bands on the outer circumferential portion 50 of the second movable contact is not limited to two, and may be one, or three or more.

[0064] The guides 53 and 54 are provided in a band shape on the outer circumferential portion 50 of the second movable contact. The guides 53 and 54 are provided, for example, continuously in the circumferential direction. The guides 53 and 54 are provided axially outward from the outer conductor bands 51 and 52. In other words, the guides 53 and 54 are provided so as to sandwich the outer conductor bands 51 and 52 therebetween. The guides 53 and 54 may be provided on the outer circumferential portion 50 of the second movable contact with some discontinuities.

[0065] The second movable contact 20 has, for example, two guides on the outer circumferential portion 50 of the second movable contact. Note that the number of guides provided on the outer circumferential portion 50 of the second movable contact is not limited to two, and may be one, or three or more.

[0066] The through-hole 55 is provided in the second movable contact 20 so as to penetrate in the axial direction. For example, as shown in Fig. 3, a plurality of through-holes 55 are provided lined up in the circumferential direction.

[0067] FIG. 4 is a perspective view of the inner conductor band 46 according to the first embodiment. The inner conductor band 46 includes a plurality of inner contacts 56. The inner contacts 56 included in the inner conductor band 46 are connected in the circumferential direction. The inner conductor band 47 includes a plurality of inner contacts, similar to the inner conductor band 46 shown in FIG. 4. The inner contacts included in the inner conductor band 47 are connected in the circumferential direction. The inner contacts included in the inner conductor band 46 or the inner conductor band 47 are each provided in contact with the movable rod 21. The inner conductor bands 46 and 47 may have the same configuration or different configurations.

[0068] FIG. 5 is a perspective view showing the outer conductor band 51 according to the first embodiment. The outer conductor band 51 includes a plurality of outer contactors 58. The outer contactors 58 included in the outer conductor band 51 are connected in the circumferential direction. The outer conductor band 52 includes a plurality of outer contactors, similar to the inner circumferential conductor band 46 shown in FIG. 5. The outer contactors included in the outer conductor band 52 are connected in the circumferential direction. The outer contactors included in the outer conductor band 51 or the outer conductor band 52 are each provided in contact with the movable-side cylinder conductor 17. The outer conductor bands 51 and 52 may have the same configuration or different configurations.

[0069] Fig. 6 is a cross-sectional view of a gas-insulated switchgear 101 according to the first embodiment. Fig. 6 shows only the vicinity of the first movable contact 19 and the second movable contact 20. In Fig. 6, the left-right direction is the axial direction. The gas-insulated switchgear 101 includes the first movable contact 19, the second movable contact 20, a movable-side rod 21, a contact coupling screw 44, a pin 62, and a washer 63.

[0070] The first movable contact 19 includes a first movable contact inner periphery 45 , a first movable contact coupling hole 48 , a first movable contact outer periphery 49 , an inner periphery contact piece 56 , and an inner periphery contact piece 57 .

[0071] The coupling hole 48 of the first movable contact is provided inside the first movable contact 19. The coupling hole 48 of the first movable contact is a hole surrounded by the inner peripheral portion 45 of the first movable contact. The movable-side rod 21 and the contact coupling screw 44 are inserted into the coupling hole 48 of the first movable contact.

[0072] The inner peripheral contact 56 and the inner peripheral contact 57 are provided on the inner peripheral portion 45 of the first movable contact. The first movable contact 19 includes, for example, four inner peripheral contacts in a cross section including the axis. Note that the number of inner peripheral contacts in a cross section including the axis is not limited to four.

[0073] The inner peripheral contactor 56 and the inner peripheral contactor 57 are provided in contact with the movable side rod 21 inserted into the coupling hole 48 of the first movable contact. The inner peripheral contactor 56 and the inner peripheral contactor 57 are provided fixed to the movable side rod 21 inserted into the coupling hole 48 of the first movable contact. The inner peripheral contactor 56 and the inner peripheral contactor 57 are electrically connected to the movable side rod 21.

[0074] The second movable contact 20 moves while the outer circumferential portion 50 of the second movable contact is in contact with the movable-side cylinder conductor 17. The second movable contact 20 includes the outer circumferential portion 50 of the second movable contact, a guide 53, a guide 54, a through hole 55, an outer circumferential contact 58, an outer circumferential contact 59, a coupling hole 60 of the second movable contact, and an inner circumferential portion 61 of the second movable contact.

[0075] The coupling hole 60 of the second movable contact is provided inside the second movable contact 20. The coupling hole 60 of the second movable contact is a hole surrounded by an inner peripheral portion 61 of the second movable contact. A contact coupling screw 44 is inserted into the coupling hole 60 of the second movable contact.

[0076] The outer peripheral contacts 58 and 59 are provided on the outer peripheral portion 50 of the second movable contact. The second movable contact 20 includes, for example, four outer peripheral contacts in a cross section including the axis. However, the number of outer peripheral contacts in a cross section including the axis is not limited to four.

[0077] The outer contactor 58 and the outer contactor 59 are provided in contact with the inner surface of the movable-side cylinder conductor 17. The outer contactor 58 and the outer contactor 59 move while contacting the inner surface of the movable-side cylinder conductor 17. By the outer contactor 58 or the outer contactor 59 moving while contacting the movable-side cylinder conductor 17, the vacuum valve 22 is driven and even when the second movable contact 20 moves together with the movable-side rod 21, the electrical connection between the second movable contact 20 and the movable-side cylinder conductor 17 can be maintained.

[0078] The guides 53 and 54 are provided on the outer periphery 50 of the second movable contact. The second movable contact 20 includes, for example, four guides in a cross section including the axis. Note that the number of guides in the cross section including the axis is not limited to four.

[0079] The guides 53 and 54 are provided near both axial ends of the outer circumferential portion 50 of the second movable contact. The guides 53 and 54 are provided, for example, at both axial ends of the outer circumferential portion 50 of the second movable contact. The guides 53 and 54 are provided axially outward from the outer contactors 58 and 59. The guides 53 and 54 are provided so as to sandwich the outer contactors 58 and 59 therebetween.

[0080] Guides 53 and 54 are provided in contact with the inner surface of the movable-side cylinder conductor 17. Guides 53 and 54 move while contacting the inner surface of the movable-side cylinder conductor 17. When guide 53 or guide 54 moves while contacting the movable-side cylinder conductor 17, radial movement of the second movable contact 20 can be suppressed, and therefore, the second movable contact 20 can move stably in the axial direction without wobbling in the radial direction. Guides 53 and 54 are made of, for example, an insulating material.

[0081] The through hole 55 is provided in the second movable contact 20, penetrating it in the axial direction. As shown in FIG. 6 , the through hole 55 is provided to communicate, within the space inside the movable-side cylindrical conductor 17, a first space 64 provided in a first direction from the second movable contact 20 with a second space 65 provided in a second direction from the second movable contact 20. That is, gas in the first space 64 can move through the through hole 55 to the second space 65. Also, gas in the second space 65 can move through the through hole 55 to the first space 64.

[0082] By providing the through hole 55, the gas in the first space 64 can move to the second space 65, and the gas in the second space 65 can move to the first space 64, so that when the second movable contact 20 moves axially, a difference in pressure between the first space 64 and the second space 65 can be suppressed.

[0083] Furthermore, when the second movable contact 20 moves in the axial direction, it is possible to suppress the occurrence of a difference in pressure in the first space 64 between before and after the second movable contact 20 moves. Furthermore, when the second movable contact 20 moves in the axial direction, it is possible to suppress the occurrence of a difference in pressure in the second space 65 between before and after the second movable contact 20 moves. In other words, it is possible to suppress an increase in pressure in the second space 65 when the second movable contact 20 moves in the second direction. Therefore, it is possible to reduce the possibility of damage to the bellows 25.

[0084] The movable rod 21 includes a movable rod outer periphery 66, a movable rod coupling hole 67, and a movable rod inner periphery 69. The movable rod outer periphery 66 is provided in contact with the first movable contact 19. The movable rod outer periphery 66 is provided fixed to the first movable contact 19. The movable rod outer periphery 66 is inserted into the coupling hole 48 of the first movable contact and fixed to the first movable contact 19. The movable rod outer periphery 66 is provided in contact with the inner peripheral contactor 56 and the inner peripheral contactor 57 provided on the inner peripheral portion 45 of the first movable contact. The movable rod coupling hole 67 is a hole surrounded by the movable rod inner periphery 69. The vacuum valve 22 side of the contact coupling screw 44 is inserted into the movable rod coupling hole 67.

[0085] The contact coupling screw 44 includes a pin hole 68. The vacuum valve 22 side of the contact coupling screw 44 is inserted into the coupling hole 48 of the first movable contact, the coupling hole 60 of the second movable contact, and the coupling hole 67 of the movable-side rod, and is fixed to the first movable contact 19, the second movable contact 20, and the movable-side rod 21. A washer 63 is sandwiched and fixed between the second movable contact 20 and the contact coupling screw 44.

[0086] The movable-side cylinder conductor 17 side of the contact coupling screw 44 is fixed to the insulating rod 16. The contact coupling screw 44 includes a pin hole 68. A pin 62 is passed through the pin hole 68. By passing the pin 62 through the pin hole 68, the insulating rod 16, the first movable contact 19, the second movable contact 20, and the movable-side rod 21 are fixed so that they move together as a unit. By passing the pin 62 through the pin hole 68, the first movable contact 19, the second movable contact 20, and the movable-side rod 21 are fixed to the contact coupling screw 44, and the insulating rod 16 is also fixed to the contact coupling screw 44, so that the number of parts used to couple the insulating rod 16, the first movable contact 19, the second movable contact 20, and the movable-side rod 21 can be reduced.

[0087] The washer 63 is fixed by being sandwiched between the second movable contact 20 and the contact coupling screw 44 .

[0088] The second movable contact 20 is fixed to the contact coupling screw 44 by an inner circumferential portion 61 of the second movable contact contacting the contact coupling screw 44. The movable-side rod 21 is fixed to the contact coupling screw 44 by an inner circumferential portion 69 of the movable-side rod contacting the contact coupling screw 44. The first movable contact 19 is provided integrally with the second movable contact 20 and is fixed to the second movable contact 20.

[0089] The first movable contact 19 is electrically connected by contact between the inner peripheral portion 45 of the first movable contact and the outer peripheral portion 66 of the movable rod. The first movable contact 19 and the second movable contact 20 are electrically connected by being integrally provided. That is, the contact portion for fixing the first movable contact 19, the second movable contact 20, and the movable rod 21 is different from the contact portion for conducting the first movable contact 19, the second movable contact 20, and the movable rod 21.

[0090] Since the contact portions for fixing the first movable contact 19, the second movable contact 20, and the movable side rod 21 are different from the contact portions for conducting the first movable contact 19, the second movable contact 20, and the movable side rod 21, the area of ​​the contact portions for fixing the first movable contact 19, the second movable contact 20, and the movable side rod 21 does not need to take into account the current-carrying capacity, and can be made smaller than in the case where the current-carrying capacity needs to be taken into account.

[0091] The area of ​​the inner peripheral portion 61 of the second movable contact, which includes the contact portion for fixing the second movable contact 20 to the contact coupling screw 44, can be reduced, i.e., the diameter of the second movable contact 20 can be reduced, thereby making it possible to miniaturize the vacuum circuit breaker 201 and the gas-insulated switchgear 101.

[0092] The gas-insulated switchgear 101 according to this embodiment comprises a tank 1 filled with gas, a vacuum valve 22 provided inside the tank 1, a fixed electrode 24 provided inside the vacuum valve 22, a movable electrode 23 provided inside the vacuum valve 22 and moving towards and away from the fixed electrode 24, a bellows 25 provided inside the vacuum valve 22 and having the movable electrode 23 arranged therein, a movable rod 21 at least partly provided inside the bellows 25 and moving in a direction in which the fixed electrode 24 and the movable electrode 23 move towards and away from each other, and a movable rod 21 provided outside the vacuum valve 22 on the bellows 25 side and moving towards and away from the fixed electrode 24 and the movable electrode 23. a first movable contact 19 provided inside the movable cylinder conductor 17, in contact with the movable rod 21, electrically connected to the movable rod 21, and moving toward and away from the movable rod 21; and a second movable contact 20 provided inside the movable cylinder conductor 17, in contact with the first movable contact 19 and the inner surface of the movable cylinder conductor 17, electrically connected to the first movable contact 19, and moving toward and away from the movable cylinder 17 together with the movable rod 21 and the first movable contact 19. Therefore, it is possible to ensure sufficient current flow in the contact portion between the second movable contact 20 and the movable cylinder conductor 17, which is the portion that moves while in contact, i.e., the outer circumferential portion 50 of the second movable contact.

[0093] Embodiment 2 A gas-insulated switchgear 102 according to embodiment 2 will be described with reference to Fig. 7. Descriptions of configurations similar to those of embodiment 1 will be omitted. In Fig. 7, the same reference numerals as those in Figs. 1 to 6 indicate the same or corresponding parts. The gas-insulated switchgear 102 according to this embodiment differs from the gas-insulated switchgear 101 according to embodiment 1 in that the movable-side cylinder conductor 71 is divided into a plurality of parts. The following description will focus on the differences from embodiment 1.

[0094] FIG. 7 is a cross-sectional view of a gas-insulated switchgear 102 according to a second embodiment. FIG. 7 shows only the vicinity of the first movable contact 19 and the second movable contact 20. In FIG. 7, the left-right direction is the axial direction. The gas-insulated switchgear 102 according to the second embodiment includes a movable-side cylinder conductor 71, a screw 75, a screw 76, a screw 77, a screw 78, a seal member 79, and a seal member 80. The movable-side cylinder conductor 71 includes a first cylinder portion 72, a second cylinder portion 73, and a third cylinder portion. That is, the movable-side cylinder conductor 71 is divided into the first cylinder portion 72, the second cylinder portion 73, and the third cylinder portion.

[0095] The cylinder first portion 72 is provided such that an inner peripheral portion 81 of the cylinder first portion is in contact with the second movable contact 20. The cylinder first portion 72 is in contact with the inner peripheral contactor 56 and the inner peripheral contactor 57, and is electrically connected to the second movable contact 20. The second movable contact 20 moves while the outer peripheral portion 50 of the second movable contact is in contact with the inner peripheral portion 81 of the cylinder first portion.

[0096] The cylinder second portion 73 is provided in a first direction relative to the cylinder first portion 72. The cylinder second portion 73 is fixed to the cylinder first portion 72 with screws 75 and 76. A seal member 79 is provided between the cylinder first portion 72 and the cylinder second portion 73. By providing the seal member 79 between the cylinder first portion 72 and the cylinder second portion 73, airtightness between the low pressure region 42 and the high pressure region 43 can be ensured.

[0097] The cylinder third portion 74 is provided in a second direction relative to the cylinder first portion 72. The cylinder third portion 74 is fixed to the cylinder first portion 72 with screws 77 and 78. A seal member 80 is provided between the cylinder first portion 72 and the cylinder third portion 74. By providing the seal member 80 between the cylinder first portion 72 and the cylinder third portion 74, airtightness between the low pressure region 42 and the high pressure region 43 can be ensured.

[0098] The sealing members 79 and 80 are, for example, O-rings. Although four screws are shown in Fig. 7, the gas-insulated switchgear 102 may include five or more screws. Furthermore, the gas-insulated switchgear 102 may include three or fewer screws.

[0099] By providing the movable-side cylinder conductor 71 in segments, when inserting the second movable contact 20 into the movable-side cylinder conductor 71, the screws 75, 76, 77, and 78 can be loosened. After the second movable contact 20 is set in its standard position, the screws 75, 76, 77, and 78 can be tightened while adjusting the position to reduce the load on the second movable contact 20 as it moves in contact with the movable-side cylinder conductor 71. Tightening the screws 75, 76, 77, and 78 while adjusting the position to reduce the load on the second movable contact 20 as it moves in contact with the movable-side cylinder conductor 71 makes it easy to increase the coaxiality between the movable-side cylinder conductor 17 and the second movable contact 20. Increasing the coaxiality between the movable-side cylinder conductor 17 and the second movable contact 20 reduces the load on the second movable contact 20 as it moves inside the movable-side cylinder conductor 71, allowing the second movable contact 20 to move more smoothly.

[0100] The standard position refers to a position where the second movable contact 20 is temporarily installed according to the design drawing. Also, the position where the load is small when the second movable contact 20 moves while in contact with the movable-side cylinder conductor 71 refers to a position where the movable-side cylinder conductor 17 and the second movable contact 20 are highly coaxial.

[0101] Embodiment 3 A gas-insulated switchgear 103 according to embodiment 3 will be described with reference to Fig. 8. Description of the same configuration as in embodiment 1 will be omitted. In Fig. 8, the same reference numerals as in Figs. 1 to 7 indicate the same or corresponding parts. The gas-insulated switchgear 103 according to this embodiment differs from the gas-insulated switchgear 101 according to embodiment 1 in that the first movable contact 82 and the second movable contact 83 are provided as separate bodies. The following description will focus on the differences from embodiment 1.

[0102] 8 is a cross-sectional view of a gas-insulated switchgear 103 according to embodiment 3. Fig. 8 shows only the vicinity of the first movable contact 82 and the second movable contact 83. In Fig. 8, the left-right direction is the axial direction. The gas-insulated switchgear 103 according to embodiment 3 includes the first movable contact 82 and the second movable contact 83.

[0103] The first movable contact 82 and the second movable contact 83 are provided as separate bodies. The first movable contact 82 is provided by being fitted into the vacuum valve 22 of the second movable contact 83. The first movable contact 82 and the second movable contact 83 are fixed to each other by being fastened together with a contact coupling screw 44. The first movable contact 82 and the second movable contact 83 are fastened together with the contact coupling screw 44. The first movable contact 82 and the second movable contact 83 are provided in contact with each other and are electrically connected.

[0104] The first movable contact 82 includes a first movable contact coupling hole 84. The first movable contact coupling hole 84 has a small diameter portion 86 with a small diameter and a large diameter portion 87 with a large diameter. The contact coupling screw 44 is inserted into the small diameter portion 86 of the first movable contact coupling hole 84. The contact coupling screw 44 and the movable-side rod 21 are inserted into the large diameter portion 87 of the first movable contact coupling hole 84.

[0105] The first movable contact 82 includes a plate portion 88 and a wall portion 89. The first movable contact 82 is provided, for example, by integrally forming the plate portion 88 provided in a direction perpendicular to the axial direction and the wall portion 89 protruding from the plate portion 88 in a second direction along the axial direction.

[0106] The second movable contact 83 includes a second movable contact coupling hole 85. The second movable contact coupling hole 85 has a small diameter portion 90 with a small diameter and a large diameter portion 91 with a large diameter. The contact coupling screw 44 is inserted into the small diameter portion 90 of the second movable contact coupling hole 85. The contact coupling screw 44 and the first movable contact 82 are inserted into the large diameter portion 91 of the second movable contact coupling hole 85.

[0107] Generally, the allowable current of the first movable contact 82 and the second movable contact 83 is determined by the number of contacts, contact pressure, and material of the contacted member. The first movable contact 82 and the second movable contact 83 are made of, for example, copper or aluminum. Copper has a higher thermal conductivity than aluminum, which means it is likely to be able to increase the allowable current. However, copper has a higher specific gravity than aluminum, which may make it difficult for the first movable contact 82 and the second movable contact 83 to move smoothly. Therefore, by reducing the amount of copper used in the first movable contact 82 and the second movable contact 83, the movement of the first movable contact 82 and the second movable contact 83 can be made smoother. Furthermore, because copper is more expensive than aluminum, by reducing the amount of copper used in the first movable contact 82 and the second movable contact 83, costs can be reduced.

[0108] The diameter of the inner peripheral portion 45 of the first movable contact, which is provided with inner peripheral contactors 56 and 57 and comes into contact with the movable rod 21, is smaller than the diameter of the outer peripheral portion 50 of the second movable contact, which is provided with outer peripheral contactors 58 and 59 and comes into contact with the movable cylinder conductor 17. Therefore, the number of inner peripheral contactors is fewer than the number of outer peripheral contactors, and it is more difficult for the first movable contact 82 to ensure a high current-carrying capacity than the second movable contact 83. Conversely, it is easier for the second movable contact 83 to ensure a high current-carrying capacity than the first movable contact 82. Since the first movable contact 82 and the second movable contact 83 according to this embodiment are provided as separate bodies, the first movable contact 82, which is difficult to ensure a high current-carrying capacity, is made of copper, and the second movable contact 83, which is easy to ensure a high current-carrying capacity, is made of aluminum. This allows the gas-insulated switchgear 301 to be lightweight and low-cost while ensuring the required current-carrying capacity.

[0109] Embodiment 4 A gas-insulated switchgear 104 according to embodiment 4 will be described with reference to Fig. 9. Description of the same configuration as in embodiment 1 will be omitted. In Fig. 9, the same reference numerals as in Figs. 1 to 8 indicate the same or corresponding parts. The gas-insulated switchgear 104 according to this embodiment differs from the gas-insulated switchgear 103 according to embodiment 3 in that a gap 94 is provided between the first movable contact 92 and the second movable contact 93. The following description will focus on the differences from embodiment 3.

[0110] 9 is a cross-sectional view of a gas-insulated switchgear 104 according to embodiment 4. Fig. 9 shows only the vicinity of the first movable contact 92 and the second movable contact 93. In Fig. 9, the left-right direction is the axial direction. The gas-insulated switchgear 104 according to embodiment 4 includes the first movable contact 92 and the second movable contact 93.

[0111] The first movable contact 92 and the second movable contact 93 are provided as separate bodies. The first movable contact 92 and the second movable contact 93 are fixed to each other by being fastened together with the contact coupling screw 44. The first movable contact 92 and the second movable contact 93 are provided in contact with each other in the axial direction, and are thereby electrically connected.

[0112] The first movable contact 92 includes a plate portion 95 and a wall portion 96. The first movable contact 92 is provided, for example, by integrally forming the plate portion 95 provided in a direction perpendicular to the axial direction and the wall portion 96 protruding from the plate portion 95 in a second direction along the axial direction.

[0113] The second movable contact 93 includes a second movable contact coupling hole 97. The second movable contact coupling hole 97 has a small diameter portion 98 with a small diameter and a large diameter portion 99 with a large diameter. The contact coupling screw 44 is inserted into the small diameter portion 98 of the second movable contact coupling hole 97. The contact coupling screw 44 and the first movable contact 92 are inserted into the large diameter portion 99 of the second movable contact coupling hole 97. A gap 94 is provided between the first movable contact 92 and the second movable contact 93 in the radial direction. That is, the gap 94 is provided in the large diameter portion 99 of the second movable contact coupling hole 97. That is, the first movable contact 92 and the second movable contact 93 are spaced apart in the radial direction.

[0114] In the gas-insulated switchgear 104, the first movable contact 92 and the second movable contact 93 are arranged radially spaced apart, which absorbs the tolerance between the first movable contact 92 and the second movable contact 93, thereby increasing the coaxiality between the first movable contact 92 and the second movable contact 93.

[0115] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0116] Furthermore, in the above-described embodiments, the materials, materials, dimensions, shapes, relative positional relationships, and implementation conditions of each component may be described, but these are merely examples in all respects and are not intended to limit the scope of each embodiment. Therefore, countless variations not exemplified are contemplated within the scope of each embodiment. For example, these include cases where any component is modified, added, or omitted, and even cases where at least one component in at least one embodiment is extracted and combined with a component in another embodiment. [Explanation of symbols]

[0117] 1 tank, 2 outer flange, 3 inner flange, 4 intermediate chamber, 7 moving bus conductor, 8 fixed bus conductor, 16 insulating rod, 17, 71 moving cylinder conductor, 19, 82, 92 first moving contact, 20, 83, 93 second moving contact, 21 moving rod, 22 vacuum valve, 23 moving electrode, 24 fixed electrode, 25 bellows, 44 contact coupling screw, 46, 47 inner conductor band, 51, 52 outer conductor band, 56, 57 inner contact, 58, 59 outer contact, 72 first cylinder part, 73 second cylinder part, 74 third cylinder part

Claims

1. a tank filled with gas; a vacuum valve provided inside the tank; a fixed electrode disposed inside the vacuum valve; a movable electrode disposed inside the vacuum valve and adapted to come into contact with and separate from the fixed electrode; a bellows disposed inside the vacuum valve and having the movable electrode disposed therein; a movable rod, at least a portion of which is provided inside the bellows and which moves in a direction in which the fixed electrode and the movable electrode move toward and away from each other; a movable-side cylinder conductor provided on the bellows side outside the vacuum valve and electrically connected to a movable-side bus conductor; a first movable contact provided inside the movable-side cylinder conductor, in contact with the movable-side rod, electrically connected to the movable-side rod, and movable together with the movable-side rod in the approaching and separating direction; a second movable contact that is provided inside the movable-side cylinder conductor, that contacts the first movable contact and the inner surface of the movable-side cylinder conductor, that is electrically connected to the first movable contact, and that moves in the approaching and separating direction together with the movable-side rod and the first movable contact while contacting the movable-side cylinder conductor, the pressure inside the bellows is higher than the pressure inside the vacuum valve; The pressure inside the bellows is lower than the pressure outside the movable cylinder conductor. Gas-insulated switchgear.

2. an outer flange provided in a direction in which the movable electrode is spaced apart from the fixed electrode from the movable cylinder conductor; an inner flange provided inside the tank, partially in contact with the outer flange, and forming an intermediate chamber between the inner flange and the outer flange; The intermediate chamber communicates with the interior of the movable cylinder conductor and the interior of the bellows. The gas-insulated switchgear according to claim 1 .

3. The radial size of the first movable contact is smaller than the radial size of the second movable contact.

3. The gas-insulated switchgear according to claim 1 or 2.

4. The second movable contact has a through hole extending therethrough in the axial direction.

3. The gas-insulated switchgear according to claim 1 or 2.

5. The movable-side cylinder conductor includes a first cylinder portion, a second cylinder portion provided in a direction in which the movable-side electrode is separated from the fixed-side electrode from the first cylinder portion, and a third cylinder portion provided in a direction in which the movable-side electrode is closer to the fixed-side electrode from the first cylinder portion.

3. The gas-insulated switchgear according to claim 1 or 2.

6. the first movable contact includes an inner circumferential conductor band having a plurality of inner circumferential contacts that contact the movable-side rod; The second movable contact has an inner circumferential conductor band having a plurality of outer circumferential contacts that contact the movable-side cylinder conductor.

3. The gas-insulated switchgear according to claim 1 or 2.

7. The first movable contact and the second movable contact are integrally formed.

3. The gas-insulated switchgear according to claim 1 or 2.

8. The first movable contact and the second movable contact are formed as separate bodies.

3. The gas-insulated switchgear according to claim 1 or 2.

9. The first movable contact and the second movable contact are spaced apart in the radial direction. The gas-insulated switchgear according to claim 7.

10. The first movable contact and the second movable contact are fastened together by a contact coupling screw. The gas-insulated switchgear according to claim 8.

Images