Gas-insulated switchgear

Abstract

The present invention provides a gas-insulated switchgear in which energization is sufficient at a portion that moves while in a contacting state.　This gas-insulated switchgear comprises: a first movable contact (19) which is provided in the interior of a movable-side cylinder conductor (17), contacts a movable-side rod (21), is electrically connected to the movable-side rod (21), and moves in a contact / separation direction together with the movable-side rod (21); and a second movable contact (20) which is provided in the interior of the movable-side cylinder conductor (17), contacts the inner surfaces of the first movable contact (19) and the movable-side cylinder conductor (17), is electrically connected to the first movable contact (19), and moves in the contact / separation direction together with the movable-side rod (21) and the first movable contact (19) while contacting the movable-side cylinder (17).

Description

Gas-insulated switchgear

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

[0002] In the prior art, there is disclosed a gas-insulated switchgear including a vacuum circuit breaker provided in an equipment chamber, and an insulating cylinder surrounding the vacuum circuit breaker, filling a low-pressure insulating gas into a space in the inner peripheral portion of the insulating cylinder, and filling a high-pressure insulating gas into a space in the equipment chamber and outside the outer peripheral portion of the insulating cylinder (for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2017-60244

[0004] However, in the prior art, there is a problem that the contact area between the movable electrode and the contact is small, and there is a possibility that the current conduction in the portion moving while contacting becomes insufficient.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a gas-insulated switchgear in which the current conduction in the portion moving while contacting is sufficient.

[0006] The gas-insulated switchgear according to the present disclosure includes a tank filled with gas, a vacuum valve provided inside the tank, a fixed-side electrode disposed inside the vacuum valve, a movable-side electrode disposed inside the vacuum valve and approaching and separating from the fixed-side electrode, a bellows disposed inside the vacuum valve and having the movable-side electrode disposed therein, a movable-side rod at least partially provided inside the bellows and moving in a direction in which the fixed-side electrode and the movable-side electrode approach and separate, a movable-side cylinder conductor provided on the bellows side outside the vacuum valve and electrically connected to the movable-side bus conductor, a first movable contact provided inside the movable-side cylinder conductor, contacting the movable-side rod, electrically connected to the movable-side rod, and moving in the approach and separation direction together with the movable-side rod, and a second movable contact provided inside the movable-side cylinder conductor, contacting the inner surface of the first movable contact and the movable-side cylinder conductor, electrically connected to the first movable contact, and moving in the approach and separation direction while contacting the movable-side rod and the first movable contact.

[0007] According to the gas-insulated switchgear described herein, sufficient current can be ensured in the parts that move while in contact.

[0008] This is a cross-sectional view of a gas-insulated switchgear according to Embodiment 1 of the present disclosure. This is a diagram showing the gas compartment of a gas-insulated switchgear according to Embodiment 1 of the present disclosure. This is a perspective view of the first movable contact, the second movable contact, and the contact coupling screw according to Embodiment 1 of the present disclosure. This is a perspective view of the inner circumferential conductor band according to Embodiment 1 of the present disclosure. This is a perspective view of the outer circumferential conductor band according to Embodiment 1 of the present disclosure. This is a cross-sectional view of a gas-insulated switchgear2 of the present disclosure. This is a cross-sectional view of a gas-insulated switchgear according to Embodiment 3 of the present disclosure. This is a cross-sectional view of a gas-insulated switchgear according to Embodiment 4 of the present disclosure.

[0009] The embodiments of this disclosure will be described below with reference to the accompanying drawings. Note that the drawings are schematic, and the relationships between sizes and positions shown in different drawings are not necessarily limited to those described and may be modified as appropriate. Furthermore, in the following description, similar components will be denoted by the same reference numerals, and their names and functions will be the same or similar. Therefore, detailed descriptions of them may be omitted.

[0010] Embodiment 1. The gas-insulated switchgear 101 according to Embodiment 1 will be described with reference to Figures 1 to 6. Figure 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 sealing member 5, a gas density monitor 6, a movable busbar conductor 7, a fixed busbar conductor 8, and a vacuum circuit breaker 201.

[0011] In Figure 1, the upper side is the movable side and the lower side is the fixed side. Note that the gas-insulated switchgear 101 does not necessarily need to have its fixed side positioned vertically; the movable side may be positioned vertically. Furthermore, the gas-insulated switchgear 101 may be arranged so that both the movable and fixed sides extend horizontally. A machine room (not shown) may be provided at the end of the movable side of the gas-insulated switchgear 101.

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

[0013] The outer flange 2 is provided on the outer circumference of the gas-insulated switchgear 101. The outer flange 2 is provided on the movable side of the movable cylinder conductor 17. The outer flange 2 is provided, for example, as part of the tank 1. The outer flange 2 may also be provided inside the tank 1. That is, 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. The connection portion 29 of the vacuum circuit breaker 201 passes through the through hole 30 of the outer flange 2. The outer flange 2 also includes, for example, a through hole 31. The gas density monitor 6 passes through the through hole 31 of the outer flange 2.

[0015] The inner flange 3 is located inside the tank 1. The inner flange 3 is located on the vacuum circuit breaker 201 side of the outer flange 2. The inner flange 3 is located on the movable side of the movable cylinder conductor 17. The inner flange 3 is located between the outer flange 2 and the movable cylinder conductor 17. The inner flange 3 is located in partial contact with the outer flange 2, forming an intermediate chamber 4 between it 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 passes 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 in communication with the interior of the movable side support insulator 13 and the interior of the movable side cylinder conductor 17.

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

[0018] The gas density monitor 6 is installed in connection with the intermediate chamber 4. The gas density monitor 6 measures the gas density of the intermediate chamber 4. The gas density monitor 6 is installed, for example, on the outer flange 2. The gas density monitor 6 is installed 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 busbar conductor 7 is electrically connected to the movable cylinder conductor 17 of the vacuum circuit breaker 201. The gas-insulated switchgear 101 is arranged in a row, for example, in a series. Part of the movable busbar conductor 7 is exposed from the tank 1 and connected to other gas-insulated switchgear located adjacent to it.

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

[0021] The vacuum circuit breaker 201 includes an operating section 11, a movable side support insulator 13, a metal insert 14, a metal insert 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 connecting section 28, and a connecting section 29.

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

[0023] The operating unit 11 is connected to the movable electrode 23 via, for example, a connecting unit 28, a connecting unit 29, an insulating rod 16, and a movable rod 21. As the operating unit 11 moves, the movable rod 21 and the movable electrode 23 also move. The movement of the movable electrode 23 allows the movable electrode 23 and the fixed electrode 24 to move from a state of contact to a state of non-contact. Also, the movement of the movable electrode 23 allows the movable electrode 23 and the fixed electrode 24 to move from a state of non-contact to a state of contact.

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

[0025] The gas-insulated switchgear 101 includes, for example, three movable electrodes and one fixed electrode. Three-phase alternating current is supplied to the three movable electrodes and the fixed electrode. The operating unit 11 is indirectly connected to the three movable electrodes and can open and close the three movable electrodes and the fixed electrode simultaneously. The operating unit 11 is installed, 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 metal insert 14 on the movable side cylinder conductor 17 side. The movable side support insulator 13 has a metal insert 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 section 11 via connecting sections 28 and 29. The insulating rod 16 is connected to the movable rod 21 and moves axially together with the movable rod 21. The insulating rod 16 is located inside the intermediate chamber 4. The movable rod 21 is located inside the movable support insulator 13. The movable rod 21 is located inside the movable cylinder conductor 17. Note that the entire movable rod 21 does not need to be located inside the movable cylinder conductor 17. The axial direction is the vertical direction in Figure 1.

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

[0029] The movable cylinder conductor 17 is, for example, cylindrical in shape, including a circular cross-section. The cylindrical shape of the movable cylinder conductor 17 increases its dielectric strength. The interior of the movable cylinder conductor 17 is in communication with the interior of the intermediate chamber 4 and the movable 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 radial portion of the vacuum valve 22. By providing the cylinder seal 18 inside the outermost radial portion 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 cylinder conductor 17. The first movable contact 19 is provided so that its inner circumference contacts the movable rod 21. The first movable contact 19 is fixed to the movable rod 21. The first movable contact 19 is electrically connected to the movable cylinder conductor 17, the second movable contact 20, the movable rod 21, and the movable electrode 23. The first movable contact 19 moves axially together with the insulating rod 16, the second movable contact 20, the movable rod 21, and the movable electrode 23.

[0032] The second movable contact 20 is located inside the movable cylinder conductor 17. The second movable contact 20 is positioned so that its outer circumference contacts the inner surface of the movable cylinder conductor 17. The second movable contact 20 is electrically connected to the movable cylinder conductor 17, the first movable contact 19, the movable rod 21, and the movable electrode 23.

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

[0034] The first movable contact 19 is fixed to the movable rod 21. Therefore, current can be easily ensured between the first movable contact 19 and the movable rod 21. In other words, even when the contact area between the first movable contact 19 and the movable rod 21 is small, sufficient current can be ensured between the first movable contact 19 and the movable rod 21. In the gas-insulated switchgear 101 according to this embodiment, sufficient current is ensured between the first movable contact 19 and the movable rod 21 by the contact between the inner circumference of the first movable contact 19 and the outer circumference of the movable rod 21.

[0035] On the other hand, the second movable contact 20 is not fixed to the movable cylinder conductor 17, but is provided to move while in contact with it. Therefore, ensuring current flow between the second movable contact 20 and the movable cylinder conductor 17 is more difficult than when they are fixed. In the gas-insulated switchgear 101 according to this embodiment, the outer circumference of the second movable contact 20 and the inner surface of the movable cylinder conductor 17 are in contact, which allows for a larger contact area than in the conventional technology where current is carried out between the inner circumference of the second movable contact 20 and a conductor that moves in contact with the inner circumference of the second movable contact 20, thus ensuring sufficient current flow.

[0036] For example, the first movable contact 19 has a size in a direction opposite to the extension direction of the movable rod 21 that is smaller than the size of the second movable contact 20 in a direction opposite to the extension direction of the movable rod 21. In other words, when comparing the sizes in the directions opposite to the extension direction of the movable 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 rod 21 is the direction in which the movable rod 21 extends. The extension direction of the movable rod 21 is also the vertical direction in Figure 1. Furthermore, the extension direction of the movable rod 21 is defined as the axial direction. That is, the axial direction is the vertical direction in Figure 1. The direction perpendicular to the axial direction is defined as the radial direction. A direction different from the extension direction of the movable rod 21 is, for example, a direction perpendicular to the extension direction of the movable rod 21. Another direction different from the extension direction of the movable rod 21 is, for example, the radial direction of the cross-section of the circular movable cylinder conductor 17. Furthermore, the circumferential direction of the cross-section of the circular movable cylinder conductor 17 is defined as the circumferential direction.

[0039] Because 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 movable cylinder conductor 17 on the vacuum valve 22 side or the interior of the vacuum valve 22 on the movable cylinder conductor 17 side is narrower than the portion in which the second movable contact 20 moves while in contact, the first movable contact 19 can fit into the narrowly provided interior of the movable cylinder conductor 17 on the vacuum valve 22 side or the interior of the vacuum valve 22 on the movable cylinder conductor 17 side. As a result, the axial size of the movable cylinder conductor 17 can be reduced, and the vacuum circuit breaker 201 and the gas-insulated switchgear 101 can be miniaturized.

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

[0041] The movable rod 21 is electrically connected to the first movable contact 19 and the movable electrode 23. The movable rod 21 is provided in contact with the inner circumference of the first movable contact 19. At least a portion of the movable rod 21 is provided inside the bellows 25 of the vacuum valve 22. The movable rod 21 is provided protruding from the vacuum valve 22. The movable rod 21 moves in the axial direction. The movable rod 21 moves in a direction that brings the movable electrode 23 and the fixed electrode 24 into contact with and away from each other.

[0042] The vacuum valve 22 is installed in a three-phase configuration inside the tank 1 of the gas-insulated switchgear 101. The vacuum valve 22 is fixed to the tank 1 via a movable-side support insulator 13. On the fixed side, the vacuum valve 22 is fixed to the tank 1 via a fixed-side support insulator 27. The vacuum valve 22 is insulated from the tank 1 by the movable-side support insulator 13 and the fixed-side support insulator 27.

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

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

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

[0046] The bellows 25 is provided inside the vacuum valve 22. The bellows 25 is provided at a position inside the vacuum valve 22 that faces the fixed-side electrode 24. The bellows 25 is provided on the side of the movable-side cylinder conductor 17 inside the vacuum valve 22. The bellows 25 is a member formed by shaping a metal plate into a bellows shape. Inside the bellows 25, a movable-side rod 21 is provided. Also, a movable-side electrode 23 may be provided inside the bellows 25. The movable-side rod 21 moves axially inside the bellows 25. The bellows 25 is provided with a vacuum outside. The inside of the bellows 25 communicates with the inside of the movable-side cylinder conductor 17.

[0047] The fixed-side connection conductor 26 is provided inside the tank 1. The fixed-side connection conductor 26 is provided on the side opposite to the vacuum valve 22 of the fixed-side electrode 24. The fixed-side connection conductor 26 is electrically connected to the fixed-side bus conductor 8 and the fixed-side electrode 24. The fixed-side connection conductor 26 is provided between the vacuum valve 22 and the fixed-side support insulator 27.

[0048] The fixed-side support insulator 27 is provided on the fixed side from the fixed-side connection conductor 26. The fixed-side support insulator 27 is fixed and provided inside the tank 1.

[0049] FIG. 2 is a diagram showing the gas compartments of the gas-insulated switchgear 101 according to Embodiment 1. The inside of the gas-insulated switchgear 101 is partitioned into a vacuum region 41, a low-pressure region 42, and a high-pressure region 43. The gas-insulated switchgear 101 has a double-pressure structure in which, in addition to the vacuum region 41 inside the vacuum valve 22, a low-pressure region 42 and a high-pressure region 43 are provided. In FIG. 2, the vacuum region 41 is indicated by a dotted line of about 5%, the low-pressure region 42 is indicated by a dotted line of about 20%, and the high-pressure region 43 is indicated 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 having excellent insulation 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 have a low-pressure region 42 by including a movable cylinder conductor 17. Furthermore, 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 circumference 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 the 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 the 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 of 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 fastenings. Fixed seals are, for example, placed in grooves formed in flanges and provided integrally with flanges and the like. Sliding seals are, for example, provided separately from the contacting member.

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

[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, a gas with lower insulating properties than sulfur hexafluoride may be used instead. When a gas with lower insulating properties is used, it is necessary to increase the pressure in the high-pressure region 43, which may result in a larger pressure difference between the inside and outside of the bellows 25. In the gas-insulated switchgear 101, the bellows 25 is in contact with the low-pressure region 42 on the inside and the vacuum region 41 on the outside, thus reducing the possibility of damage to the bellows 25 due to the pressure difference between the inside and outside.

[0057] Figure 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 Embodiment 1. As shown in Figure 3, the first movable contact 19 and the second movable contact 20 are provided as a single unit.

[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 circumference 45, an inner circumference conductor band 46, an inner circumference conductor band 47, a coupling hole 48, and an outer circumference 49. The inner circumference conductor bands 46 and 47 are provided on the inner circumference 45 of the first movable contact. The first movable contact 19 is, for example, cylindrical in shape.

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

[0060] The first movable contact 19 is provided with, for example, two inner conductor bands on its inner circumference 45. Note that the number of inner conductor bands on the inner circumference 45 of the first movable contact is not limited to two; there may be one, three or more, or any other number.

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

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

[0063] The second movable contact 20 is provided with, for example, two outer conductor bands on its outer circumference 50. Note that the outer conductor bands on the outer circumference 50 of the second movable contact are not limited to two; there may be one, three or more, or any other number.

[0064] Guides 53 and 54 are provided in a strip shape on the outer circumference 50 of the second movable contact. Guides 53 and 54 are provided, for example, continuously in the circumferential direction. Guides 53 and 54 are provided on the outside in the axial direction with respect to the outer conductor bands 51 and 52. That is, guides 53 and 54 are provided so as to sandwich the outer conductor bands 51 and 52 between them. Guides 53 and 54 may be provided on the outer circumference 50 of the second movable contact with some interruption.

[0065] The second movable contact 20 is provided with, for example, two guides on its outer circumference 50. However, the number of guides provided on the outer circumference 50 of the second movable contact is not limited to two; there may be one or three or more.

[0066] The through-hole 55 is provided in the second movable contact 20, penetrating in the axial direction. Multiple through-holes 55 are provided, for example, arranged in the circumferential direction, as shown in Figure 3.

[0067] Figure 4 is a perspective view of the inner circumferential conductor band 46 according to Embodiment 1. The inner circumferential conductor band 46 is provided with a plurality of inner circumferential contacts 56. The inner circumferential contacts 56 provided on the inner circumferential conductor band 46 are connected in the circumferential direction. The inner circumferential conductor band 47 is provided with a plurality of inner circumferential contacts, similar to the inner circumferential conductor band 46 shown in Figure 4. The inner circumferential contacts provided on the inner circumferential conductor band 47 are connected in the circumferential direction. The inner circumferential contacts provided on the inner circumferential conductor band 46 or the inner circumferential conductor band 47 are each provided in contact with the movable side rod 21. Note that the inner circumferential conductor band 46 and the inner circumferential conductor band 47 may have the same configuration or may have different configurations.

[0068] Figure 5 is a perspective view showing the outer conductor band 51 according to Embodiment 1. The outer conductor band 51 is provided with a plurality of outer contacts 58. The outer contacts 58 provided on the outer conductor band 51 are connected in the circumferential direction. The outer conductor band 52 is provided with a plurality of outer contacts, similar to the inner conductor band 46 shown in Figure 5. The outer contacts provided on the outer conductor band 52 are connected in the circumferential direction. The outer contacts provided on the outer conductor band 51 or the outer conductor band 52 are each provided in contact with the movable cylinder conductor 17. Note that the outer conductor band 51 and the outer conductor band 52 may have the same configuration or may have different configurations.

[0069] Figure 6 is a cross-sectional view of a gas-insulated switchgear 101 according to Embodiment 1. In Figure 6, only the vicinity of the first movable contact 19 and the second movable contact 20 is shown. In Figure 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, the movable side rod 21, the contact coupling screw 44, the pin 62, and the washer 63.

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

[0071] The coupling hole 48 of the first movable contact is provided on the inside of the first movable contact 19. The coupling hole 48 of the first movable contact is a hole surrounded by the inner circumference 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 circumferential contacts 56 and 57 are provided on the inner circumferential portion 45 of the first movable contact. The first movable contact 19 includes, for example, four inner circumferential contacts in a cross-section including the shaft. However, the number of inner circumferential contacts in a cross-section including the shaft is not limited to four.

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

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

[0075] The coupling hole 60 of the second movable contact is provided on the inside of the second movable contact 20. The coupling hole 60 of the second movable contact is a hole surrounded by the inner circumference 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 shaft. However, the number of outer peripheral contacts in a cross-section including the shaft is not limited to four.

[0077] The outer peripheral contacts 58 and 59 are provided in contact with the inner surface of the movable cylinder conductor 17. The outer peripheral contacts 58 and 59 move while in contact with the inner surface of the movable cylinder conductor 17. As the outer peripheral contacts 58 or 59 move while in contact with the movable cylinder conductor 17, the energized state between the second movable contact 20 and the movable cylinder conductor 17 can be maintained even when the vacuum valve 22 is driven and the second movable contact 20 moves together with the movable rod 21.

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

[0079] Guides 53 and 54 are provided near both ends in the axial direction of the outer circumference 50 of the second movable contact. For example, guides 53 and 54 are provided at both ends in the axial direction of the outer circumference 50 of the second movable contact. Guides 53 and 54 are provided on the outside in the axial direction with respect to the outer peripheral contacts 58 and 59. Guides 53 and 54 are provided so that they sandwich the outer peripheral contacts 58 and 59 between them.

[0080] Guides 53 and 54 are provided in contact with the inner surface of the movable cylinder conductor 17. Guides 53 and 54 move while in contact with the inner surface of the movable cylinder conductor 17. Because the movement of guide 53 or guide 54 while in contact with the movable cylinder conductor 17 can suppress radial movement of the second movable contact 20, the second movable contact 20 can move stably in the axial direction without radial wobble. 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 axially. As shown in Figure 6, the through-hole 55 is provided so as to connect a first space 64, located in a direction first from the second movable contact 20, and a second space 65, located in a direction second from the second movable contact 20, within the internal space of the movable cylinder conductor 17. 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] The provision of the through-hole 55 allows the gas in the first space 64 to move into the second space 65, and the gas in the second space 65 to move into the first space 64. Therefore, when the second movable contact 20 moves in the axial direction, it is possible to suppress the occurrence of a pressure difference between the first space 64 and the second space 65.

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

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

[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 rod, and is fixed to the first movable contact 19, the second movable contact 20, and the movable rod 21. The washer 63 is fixed between the second movable contact 20 and the contact coupling screw 44.

[0086] The movable 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 rod 21 are fixed together so that they can move as a single unit. By passing the pin 62 through the pin hole 68, the first movable contact 19, the second movable contact 20, and the movable rod 21 are fixed to the contact coupling screw 44, and the insulating rod 16 is also fixed to the contact coupling screw 44, thus reducing the number of parts used to connect the insulating rod 16, the first movable contact 19, the second movable contact 20, and the movable rod 21.

[0087] The washer 63 is fixed in place 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 the contact of the contact coupling screw 44, with the inner circumference 61 of the second movable contact in contact with the contact coupling screw 44. The movable side rod 21 is fixed to the contact coupling screw 44, with the inner circumference 69 of the movable side rod in contact with 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 circumference 45 of the first movable contact and the outer circumference 66 of the movable rod. The first movable contact 19 and the second movable contact 20 are electrically connected by being provided as a single unit. In other words, 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 making electrical contact between the first movable contact 19, the second movable contact 20, and the movable rod 21.

[0090] Since the contact portion for fixing the first movable contact 19, the second movable contact 20, and the movable side rod 21 is different from the contact portion for electrical conductivity between the first movable contact 19, the second movable contact 20, and the movable side rod 21, the area of ​​the contact portion for fixing the first movable contact 19, the second movable contact 20, and the movable side rod 21 does not need to be considered, and can be made smaller than when it is necessary to consider the current capacity.

[0091] The area of ​​the inner circumference 61 of the second movable contact, including the contact portion for fixing the second movable contact 20 and the contact coupling screw 44, can be reduced. In other words, the diameter of the second movable contact 20 can be reduced, which allows for miniaturization of the vacuum circuit breaker 201 and the gas-insulated switchgear 101.

[0092] The gas-insulated switchgear 101 according to this embodiment includes a tank 1 filled with gas, a vacuum valve 22 provided inside the tank 1, a fixed electrode 24 disposed inside the vacuum valve 22, a movable electrode 23 disposed inside the vacuum valve 22 that moves toward and toward the fixed electrode 24, a bellows 25 disposed inside the vacuum valve 22 with the movable electrode 23 disposed inside, a movable rod 21 which at least a portion of which is provided inside the bellows 25 and moves in the direction that the fixed electrode 24 and the movable electrode 23 move toward and toward, and a movable part provided on the outside of the vacuum valve 22 on the bellows 25 side. The device includes a movable side cylinder conductor 17 electrically connected to the side busbar conductor 7, a first movable contact 19 provided inside the movable side cylinder conductor 17, in contact with the movable side rod 21, electrically connected to the movable side rod 21, and moving toward and toward the movable side rod 21, and a second movable contact 20 provided inside the movable side cylinder conductor 17, in contact with the first movable contact 19 and the inner surface of the movable side cylinder conductor 17, electrically connected to the first movable contact 19, and moving toward and toward the movable side cylinder 17 while in contact with the movable side rod 21 and the first movable contact 19. Therefore, sufficient current can be ensured at the contact portion between the second movable contact 20 and the movable side cylinder conductor 17, that is, at the outer circumference 50 of the second movable contact, which is the part that moves while in contact.

[0093] Embodiment 2. The gas-insulated switchgear 102 according to Embodiment 2 will be described with reference to Figure 7. The same configuration as in Embodiment 1 will not be described. Also, in Figure 7, the same reference numerals as in Figures 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 cylinder conductor 71 is divided into multiple parts. The following description will focus on the differences from Embodiment 1.

[0094] Figure 7 is a cross-sectional view of a gas-insulated switchgear 102 according to Embodiment 2. In Figure 7, only the vicinity of the first movable contact 19 and the second movable contact 20 is shown. In Figure 7, the left-right direction is the axial direction. The gas-insulated switchgear 102 according to Embodiment 2 includes a movable cylinder conductor 71, screws 75, 76, 77, 78, a sealing member 79, and a sealing member 80. The movable cylinder conductor 71 includes a first cylinder part 72, a second cylinder part 73, and a third cylinder part. That is, the movable cylinder conductor 71 is provided divided into a first cylinder part 72, a second cylinder part 73, and a third cylinder part.

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

[0096] The second cylinder part 73 is positioned in a first direction relative to the first cylinder part 72. The second cylinder part 73 is fixed to the first cylinder part 72 by screws 75 and 76. A sealing member 79 is provided between the first cylinder part 72 and the second cylinder part 73. The provision of the sealing member 79 between the first cylinder part 72 and the second cylinder part 73 ensures airtightness between the low-pressure region 42 and the high-pressure region 43.

[0097] The third cylinder portion 74 is provided in a second direction relative to the first cylinder portion 72. The third cylinder portion 74 is fixed to the first cylinder portion 72 by screws 77 and 78. A sealing member 80 is provided between the first cylinder portion 72 and the third cylinder portion 74. By providing the sealing member 80 between the first cylinder portion 72 and the third cylinder 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 Figure 7, the gas-insulated switchgear 102 may include five or more screws. Alternatively, the gas-insulated switchgear 102 may include three or fewer screws.

[0099] By providing the movable cylinder conductor 71 in a divided manner, when inserting the second movable contact 20 into the movable cylinder conductor 71, screws 75, 76, 77, and 78 can be loosened, and after the second movable contact 20 is set in the standard position, screws 75, 76, 77, and 78 can be tightened while adjusting the position to minimize the load on the second movable contact 20 as it moves while contacting the movable cylinder conductor 71. Tightening screws 75, 76, 77, and 78 while adjusting the position to minimize the load on the second movable contact 20 as it moves while contacting the movable cylinder conductor 71 makes it easier to increase the coaxiality between the movable cylinder conductor 17 and the second movable contact 20. By increasing the coaxiality between the movable cylinder conductor 17 and the second movable contact 20, the load on the second movable contact 20 as it moves inside the movable cylinder conductor 71 can be reduced, and the movement of the second movable contact 20 can be made smoother.

[0100] The standard position refers to the position where the second movable contact 20 is temporarily installed according to the design drawings. Furthermore, the position where the load is small when the second movable contact 20 moves while in contact with the movable cylinder conductor 71 refers to the position where the degree of coaxiality between the movable cylinder conductor 17 and the second movable contact 20 is high.

[0101] Embodiment 3. The gas-insulated switchgear 103 according to Embodiment 3 will be described with reference to Figure 8. The same configuration as in Embodiment 1 will not be described. Also, in Figure 8, the same reference numerals as in Figures 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 components. The following description will focus on the differences from Embodiment 1.

[0102] Figure 8 is a cross-sectional view of the gas-insulated switchgear 103 according to Embodiment 3. In Figure 8, only the vicinity of the first movable contact 82 and the second movable contact 83 is shown. In Figure 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 components. The first movable contact 82 is 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 fastening them together with a contact coupling screw 44. The first movable contact 82 and the second movable contact 83 are fastened together with a contact coupling screw 44. The first movable contact 82 and the second movable contact 83 are electrically connected by being provided in contact with each other.

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

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

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

[0107] Generally, the allowable current for the first movable contact 82 and the second movable contact 83 is determined by the number of contacts, the contact pressure, and the material of the contacted member. For example, copper or aluminum can be used for the first movable contact 82 and the second movable contact 83. Copper has a higher thermal conductivity than aluminum, so it is likely that the allowable current can be increased, but copper is heavier than aluminum, which may make it difficult for the first movable contact 82 and the second movable contact 83 to move without problems. Therefore, by reducing the amount of copper used for 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. In addition, since copper is more expensive than aluminum, costs can be reduced by reducing the amount of copper used for the first movable contact 82 and the second movable contact 83.

[0108] The diameter of the inner circumference 45 of the first movable contact, which is equipped with inner circumference contacts 56 and 57 and contacts the movable rod 21, is smaller than the diameter of the outer circumference 50 of the second movable contact, which is equipped with outer circumference contacts 58 and 59 and contacts the movable cylinder conductor 17. Therefore, the number of inner circumference contacts is less than the number of outer circumference contacts, making it more difficult for the first movable contact 82 to secure current capacity than the second movable contact 83. Conversely, it is easier for the second movable contact 83 to secure current capacity than the first movable contact 82. In this embodiment, since the first movable contact 82 and the second movable contact 83 are provided as separate components, by forming the first movable contact 82, which is difficult to secure current capacity for, out of copper, and the second movable contact 83, which is easy to secure current capacity for, out of aluminum, it is possible to create a lightweight and low-cost gas-insulated switchgear 301 while securing the necessary current capacity.

[0109] Embodiment 4. The gas-insulated switchgear 104 according to Embodiment 4 will be described with reference to Figure 9. The same configuration as in Embodiment 1 will not be described. Also, in Figure 9, the same reference numerals as in Figures 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] Figure 9 is a cross-sectional view of a gas-insulated switchgear 104 according to Embodiment 4. In Figure 9, only the vicinity of the first movable contact 92 and the second movable contact 93 is shown. In Figure 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 components. The first movable contact 92 and the second movable contact 93 are fixed to each other by fastening them together with a contact coupling screw 44. The first movable contact 92 and the second movable contact 93 are electrically connected by being provided in contact in the axial direction.

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

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

[0114] In the gas-insulated switchgear 104, the first movable contact 92 and the second movable contact 93 are provided radially separated, thereby absorbing the tolerance between the first movable contact 92 and the second movable contact 93, and thus increasing the coaxiality between the first movable contact 92 and the second movable contact 93.

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

[0116] Furthermore, while the embodiments described herein may include descriptions of the material, dimensions, shape, relative arrangement, or conditions of implementation of each component, these are all illustrative examples and are not limited to those described in each embodiment. Therefore, countless variations not illustrated are conceivable within the scope of each embodiment. For example, this includes modifying, adding, or omitting any component, or even extracting at least one component from at least one embodiment and combining it with a component from another embodiment.

[0117] 1 Tank, 2 Outer flange, 3 Inner flange, 4 Intermediate chamber, 7 Movable busbar conductor, 8 Fixed busbar conductor, 16 Insulating rod, 17, 71 Movable cylinder conductor, 19, 82, 92 First movable contact, 20, 83, 93 Second movable contact, 21 Movable rod, 22 Vacuum valve, 23 Movable electrode, 24 Fixed electrode, 25 Bellows, 44 Contact coupling screw, 46, 47 Inner circumferential conductor band, 51, 52 Outer circumferential conductor band, 56, 57 Inner circumferential contact, 58, 59 Outer circumferential contact, 72 Cylinder first part, 73 Cylinder second part, 74 Cylinder third part

Claims

1. A gas-insulated switchgear comprising: 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 moving toward and toward the fixed electrode; a bellows disposed inside the vacuum valve and having the movable electrode disposed inside it; a movable rod, at least a portion of which is provided inside the bellows and which moves in a direction of moving toward and toward the fixed electrode and the movable electrode; a movable cylinder conductor provided on the bellows side of the outside of the vacuum valve and electrically connected to the movable busbar conductor; a first movable contact provided inside the movable cylinder conductor, in contact with the movable rod, electrically connected to the movable rod, and moving toward and toward the direction of the direction of moving toward and toward the direction of moving toward the direction of moving toward and toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of moving toward the direction of 2. The gas-insulated switchgear according to claim 1, wherein 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.

3. The gas-insulated switchgear according to claim 1 or 2, further comprising: an outer flange 2 provided in a direction such that the movable electrode moves away from the fixed electrode from the movable cylinder conductor 17; and an inner flange provided inside the tank, partially in contact with the outer flange, and forming an intermediate chamber 4 between itself and the outer flange, wherein the intermediate chamber communicates with the inside of the movable cylinder conductor and the inside of the bellows.

4. The gas-insulated switchgear according to any one of claims 1 to 3, wherein the radial size of the first movable contact is smaller than the radial size of the second movable contact.

5. The gas-insulated switchgear according to any one of claims 1 to 4, wherein the second movable contact is provided with a through hole that penetrates in the axial direction.

6. The gas-insulated switchgear according to any one of claims 1 to 5, wherein the movable cylinder conductor comprises a first cylinder portion, a second cylinder portion provided in a direction away from the fixed electrode from the first cylinder portion, and a third cylinder portion provided in a direction closer to the fixed electrode from the first cylinder portion.

7. The gas-insulated switchgear according to any one of claims 1 to 6, wherein the first movable contact comprises an inner conductor band having a plurality of inner contacts that contact the movable side rod, and the second movable contact comprises an inner conductor band having a plurality of outer contacts that contact the movable side cylinder conductor.

8. The gas-insulated switchgear according to any one of claims 1 to 7, wherein the first movable contact and the second movable contact are integrally formed.

9. The gas-insulated switchgear according to any one of claims 1 to 7, wherein the first movable contact and the second movable contact are formed as separate components.

10. The gas-insulated switchgear according to claim 8, wherein the first movable contact and the second movable contact are provided separated radially.

11. The gas-insulated switchgear according to claim 9 or 10, wherein the first movable contact and the second movable contact are fastened together by a contact coupling screw.

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