Gas-insulated bus

Abstract

Provided is a gas-insulated bus in which reduction in bus diameter can be easily achieved. The gas-insulated bus according to an embodiment comprises a metal container, an energization conductor, and an insulating spacer. The metal container is formed into a tubular shape, and an insulating gas is sealed in the internal space thereof. The energization conductor is housed in the internal space of the metal container so as to extend along the axial direction of the metal container. The insulating spacer supports the energization conductor in the internal space of the metal container so that the metal container and the energization conductor are electrically insulated from each other. The metal container has: a first container body part; a second container body part installed so as to be aligned with the first container body part in the axial direction; and an intermediate ring member interposed between the first container body part and the second container body part in the axial direction. The insulating spacer is installed on the inner peripheral surface of the intermediate ring member, and the insulating spacer and the intermediate ring member are fastened to each other in the radial direction by using a fastening member.

Description

Gas-insulated busbar

[0001] The embodiment relates to a gas-insulated busbar.

[0002] A gas-insulated busbar contains a current-carrying conductor to which a high voltage is applied inside a tubular metal container sealed with insulating gas. In the gas-insulated busbar, the metal container is grounded, and the insulating gas is, for example, SF ６ In addition to natural gases (oxygen, nitrogen, carbon dioxide, and mixtures thereof), the current-carrying conductor is supported inside the metal container by an insulating spacer. The insulating spacer is made of an insulating material to electrically insulate the metal container from the current-carrying conductor.

[0003] Patent No. 4575325

[0004] [A] Configuration Figures 6A and 6B are diagrams schematically illustrating an example of the configuration of a gas insulated busbar 1J according to the related art. Figure 6A is a cross section in the xz plane, which corresponds to the portion B-B in Figure 6B. Figure 6B is a cross section in the yz plane, which corresponds to the portion A-A in Figure 6A.

[0005] 6A and 6B, the gas insulated bus 1J is of a single-phase type and includes a metal container 30, a current-carrying conductor 40, and an insulating spacer 50. Each component of the gas insulated bus 1J will be described in turn.

[0006] [A-1] Metallic container 30 The metallic container 30 is formed in a tubular shape using a metallic material. Although not shown in the figure, the metallic container 30 is in a grounded state and is electrically connected to a reference potential point (such as the earth). The metallic container 30 has an insulating gas sealed in an internal space SP30. The insulating gas is SF ６ The metal container 30 is filled with a gas or the like under high pressure.

[0007] Here, the metal container 30 comprises a first container body portion 31, a second container body portion 32, and an intermediate ring member 33, which are electrically connected to each other.

[0008] The first container body 31 is, for example, a cylindrical tubular body.

[0009] The second container body 32, like the first container body 31, is, for example, a cylindrical tubular body, and is arranged coaxially with the first container body 31 in the axial direction along the tube axis of the metal container 30 (x direction in the figure).

[0010] A flange F31 is formed on the end of the first container body 31 that faces the second container body 32 so as to protrude outward in the radial direction (in the drawing, a direction along the yz plane (a direction perpendicular to the x direction)) of the metal container 30. Also, a flange F32 is formed on the end of the second container body 32 that faces the first container body 31 so as to protrude outward in the radial direction.

[0011] The intermediate ring member 33 is a circular annular body, and is disposed so as to be sandwiched in the axial direction between the first container body 31 and the second container body 32. Here, the intermediate ring member 33 is fixed between a flange F31 formed on the first container body 31 and a flange F32 formed on the second container body 32 using, for example, a plurality of stud bolts B301.

[0012] The gap between the intermediate ring member 33 and the flange F31 formed on the first container body 31 is sealed using a seal member S31. The seal member S31 is housed, for example, in a groove formed in a portion of the intermediate ring member 33 facing the flange F31 of the first container body 31. Furthermore, the gap between the intermediate ring member 33 and the flange F32 formed on the second container body 32 is sealed using a seal member S32. The seal member S32 is housed, for example, in a groove formed in a portion of the intermediate ring member 33 facing the flange F32 of the second container body 32. The seal members S31 and S32 are, for example, O-rings made of a rubber material, and the central axes of the O-rings coincide with the tube axis of the metal container 30.

[0013] In this related technology, the intermediate ring member 33 includes an intermediate ring protrusion 331. The intermediate ring protrusion 331 protrudes radially inward beyond the inner circumferential surfaces of the first container body 31 and the second container body 32. A bolt insertion hole H331 is formed in the intermediate ring protrusion 331. The bolt insertion hole H331 penetrates in the axial direction, and a male thread portion of a bolt B331 is inserted into the bolt insertion hole H331.

[0014] [A-2] Current-carrying conductor 40 The current-carrying conductor 40 is a high-voltage conductor to which a high voltage is applied. The current-carrying conductor 40 is housed in the internal space SP30 of the metal container 30 so as to extend along the axial direction of the metal container 30.

[0015] Here, the current-carrying conductor 40 includes a first current-carrying conductor 41 and a second current-carrying conductor 42 .

[0016] The first current-carrying conductor 41 is, for example, a cylindrical rod-like body and is housed inside the first container body 31 .

[0017] The second current-carrying conductor 42, like the first current-carrying conductor 41, is, for example, a cylindrical rod-shaped body, and is housed inside the second container body 32 so as to be aligned coaxially with the first current-carrying conductor 41 in the axial direction.

[0018] A hollow portion F41 is formed in the end of the first current-carrying conductor 41 that is located on the side of the second current-carrying conductor 42. In addition, a hollow portion F42 is formed in the end of the second current-carrying conductor 42 that is located on the side of the first current-carrying conductor 41.

[0019] [A-3] Insulating Spacer 50 The insulating spacer 50 supports the current-carrying conductor 40 in the internal space SP30 of the metal container 30 so as to electrically insulate the metal container 30 from the current-carrying conductor 40.

[0020] The insulating spacer 50 is a plate-like body whose plate surface extends in the radial direction of the metallic casing 30. The insulating spacer 50 has, for example, a fan-like shape when viewed in the axial direction of the metallic casing 30. The insulating spacer 50 is installed so that the central angle side of the fan-shape (the intersection side of a pair of chords that form the fan-shape) is located on the tube axis side of the metallic casing 30, and the arc side of the fan-shape is located on the inner peripheral surface side of the metallic casing 30 in the radial direction.

[0021] Here, the insulating spacer 50 has a spacer body 51, a current-carrying conductor connecting portion 52, and an intermediate ring connecting portion 53, which are all integrally formed as a cast part.

[0022] The spacer body 51 is made of an insulating material.

[0023] The current-carrying conductor connection portion 52 is provided on the central corner side of the sector-shaped insulating spacer 50. The current-carrying conductor connection portion 52 is a portion to which the current-carrying conductor 40 is electrically connected, and is formed of a metal material so as to penetrate the spacer body 51 in the axial direction.

[0024] A first contactor 411 is provided on one surface of the current-carrying conductor connection portion 52 that is located on the first current-carrying conductor 41 side in the axial direction. The first contactor 411 is, for example, cylindrical and formed of a metal material and is electrically connected to the current-carrying conductor connection portion 52. The first contactor 411 includes a protrusion that protrudes toward the first current-carrying conductor 41 in the axial direction, and the protrusion of the first contactor 411 is inserted into a hollow portion F41 formed in the first current-carrying conductor 41. A contact S41 is interposed between the protrusion of the first contactor 411 and the hollow portion F41 of the first current-carrying conductor 41, and the first contactor 411 and the first current-carrying conductor 41 are electrically connected by the contact S41.

[0025] A second contactor 421 is provided on the other surface of the current-carrying conductor connection portion 52, which is located closer to the second current-carrying conductor 42 in the axial direction. Like the first contactor 411, the second contactor 421 is, for example, cylindrical and formed of a metal material. The second contactor 421 is electrically connected to the current-carrying conductor connection portion 52. The second contactor 421 includes a protrusion that protrudes toward the second current-carrying conductor 42 in the axial direction, and the protrusion of the second contactor 421 is inserted into a hollow portion F42 formed in the second current-carrying conductor 42. A contact S42 is interposed between the protrusion of the second contactor 421 and the hollow portion F42 of the second current-carrying conductor 42, and the second contactor 421 and the second current-carrying conductor 42 are electrically connected by the contact S42.

[0026] The intermediate ring connecting portion 53 is provided on the arc side that forms the sector shape of the insulating spacer 50. The intermediate ring connecting portion 53 is a portion that is connected to the intermediate ring member 33 and is made of a metal material. The intermediate ring connecting portion 53 has a female thread portion that receives the male thread portion of the bolt B331 in the axial direction.

[0027] [B] Problem In the gas-insulated busbar 1J, current is passed between the first current-carrying conductor 41 and the second current-carrying conductor 42 via the first contact 411, the current-carrying conductor connection portion 52, and the second contact 421. The insulating spacer 50 is attached to the intermediate ring protrusion 331. The intermediate ring protrusion 331 is in a grounded state and protrudes inward beyond the inner circumferential surfaces of the first container body 31 and the second container body 32.

[0028] In the gas insulated busbar 1J, the distance of the space between the portion to which a high voltage is applied when current is applied (an electric path such as the current-carrying conductor 40) and the intermediate ring protrusion 331 in the radial direction is shorter than the distance between the portion to which a high voltage is applied when current is applied and the portion (the first container body 31, the second container body 32) other than the intermediate ring protrusion 331 in the radial direction. As a result, the electric field in the portion to which a high voltage is applied when current is applied, which faces the intermediate ring protrusion 331 in the radial direction, is higher than the electric field in the portion to which a high voltage is applied when current is applied, which faces the portion (the first container body 31, the second container body 32) other than the intermediate ring protrusion 331 in the radial direction.

[0029] Therefore, in the gas insulated bus bar 1J of the related art, in order to ensure sufficient insulation performance between a portion to which a high voltage is applied during current flow (an electric path such as the current-carrying conductor 40) and the metallic enclosure 30, it is necessary to increase the distance between them. As a result, it may be difficult to reduce the bus diameter (the inner diameter and the outer diameter of the metallic enclosure 30, etc.) of the gas insulated bus bar 1J.

[0030] Therefore, an object of the present invention is to provide a gas-insulated busbar that can easily achieve a reduction in the diameter of the busbar.

[0031] The gas-insulated busbar of one embodiment includes a metallic container, a current-carrying conductor, and an insulating spacer. The metallic container is tubular, and an insulating gas is sealed in its internal space. The current-carrying conductor is accommodated in the internal space of the metallic container and extends along the axial direction of the metallic container. The insulating spacer supports the current-carrying conductor in the internal space of the metallic container so as to electrically insulate the metallic container from the current-carrying conductor. The metallic container includes a first container body, a second container body arranged axially alongside the first container body, and an intermediate ring member interposed between the first container body and the second container body in the axial direction. The insulating spacer is arranged on an inner circumferential surface of the intermediate ring member, and the insulating spacer and the intermediate ring member are radially fastened together using fastening members.

[0032] FIG. 1A is a diagram (x-z cross section) that schematically shows the configuration of a gas insulated bus bar 1 according to a first embodiment. FIG. 1B is a diagram (y-z cross section) that schematically shows the configuration of the gas insulated bus bar 1 according to the first embodiment. FIG. 1C is a diagram (partially enlarged view of FIG. 1A) that schematically shows the configuration of the gas insulated bus bar 1 according to the first embodiment. FIG. 1D is a diagram that shows an electric field distribution related to an electric field generated in an insulating gas in a gas insulated bus bar 1J according to a related art. FIG. 1E is a diagram that shows an electric field distribution related to an electric field generated in an insulating gas in the gas insulated bus bar 1 according to the first embodiment. FIG. 2A is a diagram (part B-B in FIG. 2B) that schematically shows the configuration of a gas insulated bus bar 1b according to a second embodiment. FIG. 2B is a diagram (part A-A in FIG. 2A) that schematically shows the configuration of a gas insulated bus bar 1c according to a third embodiment. Fig. 4 is a diagram (cross section in xz plane) schematically showing a configuration of a gas insulated bus 1d according to a fourth embodiment. Fig. 5A is a diagram (cross section in xz plane) schematically showing a configuration of a gas insulated bus 1d according to a modification of the fourth embodiment. Fig. 5B is a diagram (cross section in yz plane) schematically showing a configuration of a gas insulated bus 1d according to a modification of the fourth embodiment. Fig. 5C is a diagram (cross section in xz plane) schematically showing a configuration of a gas insulated bus 1d according to a modification of the fourth embodiment. Fig. 5D is a diagram (cross section in yz plane) schematically showing a configuration of a gas insulated bus 1J according to a related art.

[0033] <First embodiment> [A] Configuration Figures 1A to 1C are diagrams schematically showing the configuration of a gas insulated busbar 1 according to a first embodiment. Figure 1A is a cross section in the xz plane, which corresponds to the portion B-B in Figure 1B. Figure 1B is a cross section in the yz plane, which corresponds to the portion A-A in Figure 1A. Figure 1C shows an enlarged view of a portion of Figure 1A.

[0034] As shown in FIGS. 1A to 1C , the gas insulated busbar 1 of this embodiment includes a metal container 30, a current-carrying conductor 40, and an insulating spacer 50, similar to the related art (see FIGS. 6A and 6B ), and the metal container 30 includes a first container body portion 31, a second container body portion 32, and an intermediate ring member 33.

[0035] However, the gas insulated busbar 1 of this embodiment differs from that of the related art in the configuration of the intermediate ring member 33 and the state in which the insulating spacer 50 is installed in the intermediate ring member 33. Except for this point and related matters, this embodiment is similar to that of the related art, and therefore, description of overlapping matters will be omitted as appropriate.

[0036] [A-1] Metallic container 30 As in the case of the related art described above, the metallic container 30 is a cylindrical tubular body in which an insulating gas is sealed in an internal space SP 30. The metallic container 30 has a first container body 31 and a second container body 32, and an intermediate ring member 33 interposed between them.

[0037] However, in this embodiment, unlike the related art, the intermediate ring member 33 does not include an intermediate ring protrusion 331 (see FIGS. 6A and 6B ). In this embodiment, the intermediate ring member 33 is, for example, a circular annular body, and the inner diameter of the intermediate ring member 33 is larger than the inner diameter of the first container body 31 and the inner diameter of the second container body 32.

[0038] A bolt insertion hole H33 into which the male thread portion of the bolt B331 is inserted is formed in the intermediate ring member 33. In this embodiment, the bolt insertion hole H33 is formed in the intermediate ring member 33 so as to penetrate the metal container 30 in the radial direction.

[0039] A lid portion 60 is provided on the outer peripheral surface of the intermediate ring member 33. The lid portion 60 is a plate-shaped body and is provided to close the bolt insertion hole H33. A seal member S60 (first seal member) is used to seal between the intermediate ring member 33 and the lid portion 60. The seal member S60 is housed, for example, in a groove formed in a portion of the lid portion 60 that faces the intermediate ring member 33. The seal member S60 is, for example, an O-ring made of a rubber material and is provided so that the central axis of the O-ring coincides with the central axis of the bolt insertion hole H33.

[0040] [A-2] Current-carrying conductor 40 As in the case of the related art described above, the current-carrying conductor 40 comprises a first current-carrying conductor 41 and a second current-carrying conductor 42, and is housed in the internal space SP30 of the metal container 30 so as to extend along the axial direction of the metal container 30.

[0041] [A-3] Insulating Spacer 50 As in the related art described above, the insulating spacer 50 supports the current-carrying conductor 40 in the internal space SP30 of the metal container 30 so as to electrically insulate the metal container 30 from the current-carrying conductor 40. The insulating spacer 50 is, for example, a fan-shaped plate-like body, and has a spacer body 51, a current-carrying conductor connecting portion 52, and an intermediate ring connecting portion 53.

[0042] However, in this embodiment, unlike the related art, the insulating spacer 50 is installed on the inner peripheral surface of the intermediate ring member 33. The intermediate ring connecting portion 53 is formed with a female thread portion into which a male thread portion of a bolt B331 (fastening member) is inserted in the radial direction of the metal container 30. That is, in this embodiment, the insulating spacer 50 and the intermediate ring member 33 are fastened together in the radial direction using the bolt B33.

[0043] [B] Summary As described above, in the gas insulated busbar 1 of this embodiment, the insulating spacer 50 is installed on the inner surface of the intermediate ring member 33, and the insulating spacer 50 and the intermediate ring member 33 are fastened together radially using the bolt B33.

[0044] Since the intermediate ring member 33 of this embodiment does not have an intermediate ring protrusion 331 (see Figures 6A and 6B), the inner surface of the intermediate ring member 33 of this embodiment does not protrude radially inward beyond the inner surfaces of the first container body portion 31 and the second container body portion 32.

[0045] Therefore, in the gas insulated bus bar 1 of this embodiment, the distance of the space between the portions to which a high voltage is applied during energization (such as the first current-carrying conductor 41 and the second current-carrying conductor 42) and the intermediate ring member 33 in the radial direction is equal to or greater than the distance between the portions to which a high voltage is applied during energization and the portions other than the intermediate ring member 33 (the first container body 31 and the second container body 32). This prevents the electric field at the portions of the portions to which a high voltage is applied during energization, which are opposed to the intermediate ring member 33 in the radial direction, from becoming higher than the electric field at the portions to which a high voltage is applied during energization, which are opposed to the portions other than the intermediate ring member 33 (the first container body 31 and the second container body 32). As a result, in the gas insulated bus bar 1 of this embodiment, it is not necessary to increase the distance between the portions to which a high voltage is applied during energization and the metallic container 30 in order to ensure sufficient insulation performance between them. Therefore, in this embodiment, the bus bar diameter of the gas insulated bus bar 1 can be easily reduced.

[0046] Fig. 1D is a diagram showing an electric field distribution related to an electric field generated in an insulating gas in a gas insulated bus 1J according to a related art. Fig. 1E is a diagram showing an electric field distribution related to an electric field generated in an insulating gas in the gas insulated bus 1 according to the first embodiment.

[0047] Fig. 1D shows a part of the upper half of the gas insulated bus 1J shown in Fig. 6A, and Fig. 1E shows a part of the upper half of the gas insulated bus 1 shown in Fig. 1A. Fig. 1D and Fig. 1E show the results of the electric field distribution of the gas insulated bus 1J according to the related art and the electric field distribution of the gas insulated bus 1 according to the first embodiment, obtained under the same conditions, except that the configuration of the intermediate ring member 33 and the state in which the insulating spacer 50 is installed in the intermediate ring member 33 are different.

[0048] When the maximum field value of the electric field generated in the gas insulated bus 1J of the related art is normalized to "100" (see FIG. 1D), the maximum field value of the electric field generated in the gas insulated bus 1 of this embodiment is "81.3" (see FIG. 1D). Therefore, if the maximum field value of "100" of the electric field generated in the gas insulated bus 1J of the related art is acceptable, the bus diameter of the gas insulated bus 1 can be reduced until the maximum field value of the electric field generated in the gas insulated bus 1 of this embodiment increases from "81.3" to "100".

[0049] Furthermore, in the gas insulated bus bar 1 of this embodiment, the gap between the intermediate ring member 33 and the lid portion 60 is sealed using the seal member S60. Therefore, in this embodiment, the seal member S60 can effectively prevent the insulating gas sealed in the internal space SP30 of the metal container 30 from leaking to the outside from between the intermediate ring member 33 and the lid portion 60 through the bolt insertion holes H33 formed in the intermediate ring member 33.

[0050] Second Embodiment [A] Configuration Figures 2A and 2B are diagrams schematically illustrating the configuration of a gas insulated bus bar 1b according to a second embodiment. Figure 2A corresponds to the portion B-B in Figure 2B. Figure 2B corresponds to the portion A-A in Figure 2A.

[0051] As shown in FIGS. 2A and 2B, the gas insulated bus 1b of this embodiment includes a metal container 30, a current-carrying conductor 40, and an insulating spacer 50, similar to the first embodiment (see FIGS. 1A to 1C).

[0052] However, unlike the first embodiment, the gas insulated busbar 1b of this embodiment is not a single-phase type but a three-phase type (three-phase integrated type), and a plurality of current-carrying conductors 40 and a plurality of insulating spacers 50 are housed inside one metal container 30. Except for this point and related matters, this embodiment is similar to the related art described above, and therefore, description of overlapping matters will be omitted as appropriate.

[0053] 2A and 2B , in this embodiment, the three current-carrying conductors 40 are arranged at intervals in the circumferential direction of the metal casing 30 in the internal space SP30 of the metal casing 30. In the internal space SP30 of the metal casing 30, three insulating spacers 50 are installed so as to support the three current-carrying conductors 40, respectively.

[0054] [B] Summary In the gas insulated bus bar 1b of this embodiment, as in the first embodiment, the inner circumferential surface of the intermediate ring member 33 does not protrude radially inward beyond the inner circumferential surfaces of the first container body 31 and the second container body 32. The insulating spacer 50 is installed on the inner circumferential surface of the intermediate ring member 33, and the insulating spacer 50 and the intermediate ring member 33 are fastened together radially using bolts B33.

[0055] Therefore, in the gas insulated bus bar 1b of this embodiment, similarly to the first embodiment, the bus bar diameter of the gas insulated bus bar 1 can be easily reduced.

[0056] Third Embodiment [A] Configuration Fig. 3 is a diagram schematically illustrating the configuration of a gas insulated bus bar 1c according to a third embodiment. Fig. 3 shows a cross section taken along the xz plane, similar to Fig. 1A.

[0057] 3, similarly to the first embodiment (see FIGS. 1A to 1C), the gas insulated bus 1c of this embodiment includes a metal container 30, a current-carrying conductor 40, and an insulating spacer 50. The insulating spacer 50 includes a spacer body 51, a current-carrying conductor connecting portion 52, and an intermediate ring connecting portion 53.

[0058] However, in this embodiment, the structure of the spacer body 51 is different from that of the first embodiment. Except for this point and related matters, this embodiment is similar to the related art described above, and therefore, explanations of overlapping matters will be omitted as appropriate.

[0059] In this embodiment, the spacer body 51 differs from the first embodiment in that it includes a first spacer body portion 511 , a second spacer body portion 512 , and a third spacer body portion 513 .

[0060] The first spacer body 511 is a plate-like body with a plate surface extending in the radial direction (direction along the yz plane), and is provided with a current-carrying conductor connection portion 52. The current-carrying conductor connection portion 52 is formed so as to penetrate the first spacer body 511 in the axial direction (x direction).

[0061] The second spacer main body 512 is a plate-like body with a plate surface extending in the radial direction, similar to the first spacer main body 511. The second spacer main body 512 is provided radially outward of the first spacer main body 511 and at a different position in the axial direction from the first spacer main body 511. The second spacer main body 512 is provided with an intermediate ring connecting portion 53. The intermediate ring connecting portion 53 is provided at one end (the upper end in the drawing) located radially outward of the second spacer main body 512.

[0062] The third spacer main body 513 is a plate-like body with a plate surface extending in the axial direction. The third spacer main body 513 is interposed between the first spacer main body 511 and the second spacer main body 512 in the axial direction. Here, one end side (the right end in the figure) of the third spacer main body 513 in the axial direction is connected to one end (the upper end in the figure) located on the outer side of the first spacer main body 511 in the radial direction. The other end side (the left end in the figure) of the third spacer main body 513 in the axial direction is connected to the other end (the lower end in the figure) located on the inner side of the second spacer main body 512 in the radial direction.

[0063] [B] Summary As described above, in the gas insulated bus bar 1c of this embodiment, the spacer body 51 includes the third spacer body portion 513 (axially extending portion) extending along the axial direction. The third spacer body portion 513 is interposed between the inner peripheral surface of the metallic container 30 and the outer peripheral surface of the current-carrying conductor 40 in the internal space SP30 of the metallic container 30. Therefore, the insulating spacer 50 of this embodiment has a longer creepage distance than the first embodiment, and therefore has improved creepage insulation performance compared to the first embodiment.

[0064] Therefore, in the gas insulated bus bar 1c of this embodiment, in addition to the same effects as in the first embodiment, it is possible to easily achieve an improvement in creepage insulation performance.

[0065] <Fourth embodiment> [A] Configuration Fig. 4 is a diagram schematically showing the configuration of a gas insulated bus bar 1d according to a fourth embodiment. Fig. 4 is an enlarged view of the cross section of the xz plane, similar to Fig. 1C.

[0066] As shown in Fig. 4, the gas insulated bus 1d of this embodiment differs from the first embodiment (see Fig. 1C) in that a cover 60 is not provided on the outer peripheral surface of the intermediate ring member 33. Unlike the first embodiment, the gas insulated bus 1d of this embodiment is provided with a seal member S30 (second seal member). Except for this point and related matters, this embodiment is similar to the related art described above, and therefore, description of overlapping matters will be omitted as appropriate.

[0067] In this embodiment, the seal member S30 is provided between the intermediate ring member 33 and the insulating spacer 50 and seals the gap between the intermediate ring member 33 and the insulating spacer 50. The seal member S30 is housed, for example, in a groove formed in a portion of the intermediate ring member 33 that faces the intermediate ring connecting portion 53 of the insulating spacer 50 (the inner circumferential surface of the intermediate ring member 33). The seal member S30 is, for example, an O-ring made of a rubber material and is installed so that the central axis of the O-ring coincides with the central axis of the bolt insertion hole H33.

[0068] [B] Summary In the gas insulated bus bar 1d of this embodiment, the seal member S30 seals the gap between the intermediate ring member 33 and the insulating spacer 50. Therefore, in this embodiment, the seal member S30 can effectively prevent the insulating gas sealed in the internal space SP30 of the metal container 30 from leaking from between the intermediate ring member 33 and the insulating spacer 50 to the outside via the bolt insertion hole H33.

[0069] 5A to 5D are diagrams schematically illustrating the configuration of a gas insulated bus 1d according to a modification of the fourth embodiment. Similar to FIG. 4, each of FIGS. 5A to 5D illustrates an enlarged cross section taken along the xz plane.

[0070] As shown in Figure 5A, the sealing member S30 may be housed in a groove formed in the portion of the intermediate ring connection portion 53 that constitutes the insulating spacer 50 that faces the intermediate ring member 33 (the inner surface of the intermediate ring connection portion 53).

[0071] As shown in Figure 5B, the sealing member S30 may be housed in a groove formed in the portion of the spacer main body 51 that constitutes the insulating spacer 50 that faces the intermediate ring member 33 (the inner surface of the spacer main body 51).

[0072] As shown in Figure 5C, the sealing member S30 may be housed in a groove formed in the portion of the intermediate ring member 33 that faces the spacer body 51 of the insulating spacer 50 (the inner surface of the intermediate ring member 33).

[0073] 5D, the sealing member S30 may be disposed so as to be sandwiched between the inner peripheral surface of the intermediate ring member 33 and the inner peripheral surface of the insulating spacer 50. The sealing member S30 may be an O-ring made of a rubber material or a metal gasket made of a metal material.

[0074] The modifications shown in FIGS. 5A to 5D also provide the same effects as those of the above embodiment.

[0075] <Others> Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are intended to be included in the scope of the invention and its equivalents as defined in the claims, as well as in the scope and spirit of the invention.

[0076] 1: gas-insulated busbar, 1b: gas-insulated busbar, 1c: gas-insulated busbar, 1d: gas-insulated busbar, 1J: gas-insulated busbar, 30: metal container, 31: first container body, 32: second container body, 33: intermediate ring member, 40: current-carrying conductor, 41: first current-carrying conductor, 42: second current-carrying conductor, 50: insulating spacer, 51: spacer body, 52: current-carrying conductor connection portion, 53: intermediate ring connection portion, 60: lid portion, 331: intermediate ring protrusion, 411: first contact, 421: second Contactor, 511: first spacer body, 512: second spacer body, 513: third spacer body, B33: bolt, B301: stud bolt, B331: bolt, F31: flange, F32: flange, F41: hollow portion, F42: hollow portion, H33: bolt insertion hole, H331: bolt insertion hole, S30: sealing member, S31: sealing member, S32: sealing member, S41: contact, S42: contact, S60: sealing member, SP30: internal space

Claims

1. A gas-insulated busbar comprising: a tubular metal container having an internal space filled with an insulating gas; a current-carrying conductor housed in the internal space of the metal container so as to extend along the axial direction of the metal container; and an insulating spacer supporting the current-carrying conductor in the internal space of the metal container so as to electrically insulate the metal container from the current-carrying conductor, wherein the metal container has: a first container body portion; a second container body portion arranged to be aligned with the first container body portion in the axial direction; and an intermediate ring member interposed between the first container body portion and the second container body portion in the axial direction, the insulating spacer being arranged on an inner circumferential surface of the intermediate ring member, and the insulating spacer and the intermediate ring member being radially fastened together using a fastening member.

2. The gas insulated busbar according to claim 1, wherein the current-carrying conductors are multiple and are arranged in the internal space of the metal container at intervals in the circumferential direction of the metal container, and the insulating spacers are multiple and each of the insulating spacers is installed so as to support a respective one of the current-carrying conductors.

3. A gas insulated busbar as claimed in claim 1, wherein the fastening member has a bolt having a male thread formed thereon, the intermediate ring member is formed so as to have a bolt insertion hole through it in the radial direction, into which the male thread portion of the bolt is inserted, and the insulating spacer is formed with a female thread portion into which the male thread portion of the bolt is inserted.

4. A gas-insulated busbar as described in claim 3, further comprising: a lid portion attached to the outer peripheral surface of the intermediate ring member to close the bolt insertion hole; and a first seal member is used to seal between the intermediate ring member and the lid portion so as to prevent the insulating gas sealed in the internal space of the metal container from leaking out from between the intermediate ring member and the lid portion through the bolt insertion hole to the outside.

5. A gas insulated busbar as claimed in claim 3, wherein the space between the intermediate ring member and the insulating spacer is sealed with a second seal member so as to prevent the insulating gas sealed in the internal space of the metal container from leaking from between the intermediate ring member and the insulating spacer through the bolt insertion hole to the outside.

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