Solid insulated busbar connection device

Abstract

The solid insulated bus connection device (50) comprises a pair of tank connection portions (51, 52) attached to each of two electrical devices to be connected, and a solid insulated bus portion (30) installed between the tank connection portions (51, 52). The solid insulated bus portion (30) comprises vertical bus portions (55, 57) having a first central conductor covered with insulating resin and installed so that the first central conductor extends in a vertical direction, and a horizontal bus portion (56) having a second central conductor covered with insulating resin and installed so that the second central conductor extends in a horizontal direction.

Description

[Technical field]

[0001] The present disclosure relates to a solid insulated busbar connection device for interconnecting electrical devices. Place Regarding. [Background technology]

[0002] Conventionally, when interconnecting electrical equipment such as gas-insulated equipment, a connection device that insulates the conductors by housing them in a tank filled with an insulating gas such as sulfur hexafluoride is installed between the electrical equipment to be connected.

[0003] In recent years, from the viewpoint of environmental protection, there has been a demand to reduce the amount of insulating gases such as sulfur hexafluoride that have a high environmental impact. For this reason, there is also a demand for connection devices to be structured so as not to use insulating gases that have a high environmental impact.

[0004] Patent Document 1 discloses a connection device in which a straight rod-shaped conductor is covered with a fixed covering part. The connection device disclosed in Patent Document 1 insulates a straight rod-shaped conductor by covering it with a solid covering part, and therefore insulates the conductor without using insulating gas that has a high environmental load. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-44958 A Summary of the Invention [Problem to be solved by the invention]

[0006] The connection device disclosed in Patent Document 1 uses a single straight rod-shaped conductor to connect the devices to be connected, so the two electrical devices to be connected must be installed at the same height. However, depending on the installation environment of the electrical devices to be connected, it may not be possible to install the two electrical devices at the same height, resulting in a difference in height between the two electrical devices. In such a case, the connection device disclosed in Patent Document 1 cannot connect the two electrical devices to be connected.

[0007] The present disclosure has been made in consideration of the above, and aims to obtain a solid-insulated busbar connection device that can connect electrical devices to be connected even if the electrical devices to be connected are installed at different heights. [Means for solving the problem]

[0008] In order to solve the above problems and achieve the object, the solid insulated bus connection device according to the present disclosure includes a pair of tank connection parts attached to each of two electric devices to be connected, and a solid insulated bus part installed between the tank connection parts. The solid insulated bus part includes a vertical bus part having a first central conductor covered with insulating resin and installed so that the first central conductor extends in a vertical direction, and a horizontal bus part having a second central conductor covered with insulating resin and installed so that the second central conductor extends in a horizontal direction. Effect of the Invention

[0009] Advantageous Effects of Invention According to the present disclosure, it is possible to obtain an effect of obtaining a solid insulated busbar connection device capable of connecting electrical devices to be connected even when the electrical devices to be connected are installed at different heights. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing a configuration of a solid-insulated busbar connection device according to a first embodiment. [Diagram 2] FIG. 3 is a cross-sectional view showing the configuration of a vertical busbar portion of a solid-insulated busbar connection device according to the first embodiment. [Diagram 3]FIG. 1 is a cross-sectional view showing a configuration of a horizontal busbar portion of a solid-insulated busbar connection device according to a first embodiment. [Figure 4] FIG. 3 is a cross-sectional view showing the configuration of a conductor connection portion of the solid-insulated busbar connection device according to the first embodiment. [Diagram 5] 1 is a horizontal cross-sectional view of a conductor connection portion of a solid-insulated busbar connection device according to embodiment 1. [Figure 6] FIG. 3 is a cross-sectional view showing a configuration of a tank connection portion of the solid insulated busbar connection device according to the first embodiment. [Figure 7] FIG. 3 is a cross-sectional view showing the configuration of a pressing part of the solid insulated busbar connection device according to the first embodiment. [Figure 8] FIG. 11 is a cross-sectional view showing the configuration of a solid-insulated busbar connection device according to a second embodiment. [Figure 9] FIG. 11 is a cross-sectional view showing the configuration of a solid-insulated busbar connection device according to a third embodiment. [Figure 10] 13 is a top view of a multi-contact of a solid insulated busbar connection device according to embodiment 3. [Figure 11] 11 is a cross-sectional view of a multi-contact of a solid insulated busbar connection device according to a third embodiment. [Figure 12] 11 is a cross-sectional view of a multi-contact of a solid insulated busbar connection device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The solid insulated busbar connecting device according to the embodiment will be described below. Place A detailed explanation will be given based on the drawings.

[0012] Embodiment 1 FIG. 1 is a cross-sectional view showing a configuration of a solid insulated busbar connection device according to a first embodiment. A solid insulated busbar connection device 50 is installed between a tank 1a of a first electric device and a tank 1b of a second electric device to electrically connect the two. The solid insulated busbar connection device 50 has a tank connection part 51 attached to the tank 1a of the first electric device, a tank connection part 52 attached to the tank 1b of the second electric device, a pressing part 53 for pressing the tank connection part 51 against the tank 1a, a pressing part 54 for pressing the tank connection part 52 against the tank 1b, and a solid insulated busbar part 30 installed between the tank connection part 51 and the tank connection part 52. The solid insulated busbar part 30 includes vertical busbar parts 55, 57 and a horizontal busbar part 56, a conductor connection part 58 for connecting the vertical busbar part 55 and the horizontal busbar part 56, and a conductor connection part 59 for connecting the horizontal busbar part 56 and the vertical busbar part 57. The vertical busbar sections 55, 57 are installed so as to extend upward from the tank connection sections 51, 52, and the horizontal busbar section 56 is installed above the tank connection sections 51, 52.

[0013] The tanks 1a and 1b are provided with cylindrical main body parts 19a and 19b, tank lid plate flanges 11a and 11b installed at one end of the main body parts 19a and 19b, cup-shaped insulators 13a and 13b, connection conductors 14a and 14b, and insulator fixing flanges 16a and 16b. The insulator fixing flanges 16a and 16b are fixed at one end of the main body parts 19a and 19b. The insulator fixing flanges 16a and 16b are provided with cup-shaped insulators 13a and 13b and electric field relaxation ring shields 17a and 17b. O-rings 181a and 181b are provided between the tanks 1a and 1b and the tank lid plate flanges 11a and 11b. O-rings 182a and 182b are provided between the tank lid plate flanges 11a and 11b and the insulator fixing flanges 16a and 16b. O-rings 183a, 183b are installed between the insulator fixing flanges 16a, 16b and the cup-shaped insulators 13a, 13b. Therefore, the gaps between the tanks 1a, 1b and the tank lid plate flanges 11a, 11b, the gaps between the tank lid plate flanges 11a, 11b and the insulator fixing flanges 16a, 16b, and the gaps between the insulator fixing flanges 16a, 16b and the cup-shaped insulators 13a, 13b are all kept airtight. The cup-shaped insulators 13a, 13b are coated with insulating grease 15. The cup-shaped insulators 13a, 13b form recesses 12a, 12b into which the tank connecting parts 51, 52 are inserted. The connection conductors 14a, 14b are installed in the recesses 12a, 12b at the bottoms of the cup-shaped insulators 13a, 13b. The connecting conductors 14a and 14b are formed with holes 141a and 141b.

[0014] FIG. 2 is a cross-sectional view showing a configuration of a vertical busbar section of the solid insulated busbar connection device according to the first embodiment. The vertical busbar sections 55 and 57 include a first central conductor 61 having a straight rod shape, an insulating resin section 62 which is an insulating resin covering the first central conductor 61, and an outer jacket section 63 which covers a part of the insulating resin section 62 exposed to the outside air. The outer jacket section 63 is made of a conductive material and is connected to the ground for grounding. An end section 611 of the first central conductor 61 protrudes from the insulating resin section 62. The end section 611 of the first central conductor 61 is a rounded rectangular prism section formed into a rounded rectangular prism shape. The rounded rectangular prism section has a through hole 613 which extends in a direction perpendicular to the axial direction of the first central conductor 61 and penetrates the first central conductor 61. The vertical busbar sections 55 and 57 are installed so that the first central conductor 61 extends in the vertical direction.

[0015] 3 is a cross-sectional view showing the configuration of the horizontal busbar section of the solid insulated busbar connection device according to the first embodiment. The horizontal busbar section 56 includes a straight rod-shaped second central conductor 71, an insulating resin section 72 which is an insulating resin covering the second central conductor 71, and an outer jacket section 73 which covers a portion of the insulating resin section 72 exposed to the outside air. The outer jacket section 73 is made of a conductive material and is connected to the ground for earthing. An end section 711 of the second central conductor 71 protrudes from the insulating resin section 72. A female screw 713 is formed on an end face of the second central conductor 71. The horizontal busbar section 56 is installed so that the second central conductor 71 extends in the horizontal direction.

[0016] 4 is a cross-sectional view showing the configuration of a conductor connection portion of the solid insulated bus connection device according to embodiment 1. Conductor connection portions 58, 59 include a conductive resin portion 91 that connects first central conductor 61 and second central conductor 71, an insulating resin portion 92 that covers conductive resin portion 91, an outer sheath portion 93 that covers insulating resin portion 92, a fastener 94 and a screw 95 that fasten first central conductor 61, an insulating cap 96 that covers fastener 94 and screw 95, and a conductive cover 97 that covers insulating cap 96.

[0017] The conductive resin part 91 is T-shaped with three intersecting cylinders, and includes a first cylinder part 911 into which the second central conductor 71 is inserted, a second cylinder part 912 into which the first central conductor 61 is inserted, and a third cylinder part 913 in which the fixing metal fitting 94 is disposed. The first cylinder part 911 and the third cylinder part 913 are arranged coaxially, and the second cylinder part 912 is arranged perpendicular to the first cylinder part 911 and the third cylinder part 913.

[0018] 5 is a horizontal cross-sectional view of the conductor connection part of the solid insulated busbar connection device according to the first embodiment. When the second central conductor 71 is inserted into the first cylindrical part 911 and the first central conductor 61 is inserted into the second cylindrical part 912, the side surface of the rounded rectangular column of the end part 611 of the first central conductor 61 and the end face of the second central conductor 71 come into surface contact. With the second central conductor 71 inserted into the first cylindrical part 911 and the end part 611 of the first central conductor 61 inserted into the second cylindrical part 912, a screw 95 is passed through the through hole 613 of the first central conductor 61 and the through hole 941 of the fixing metal fitting 94, and the screw 95 is screwed into the female thread 713, so that the first central conductor 61 and the second central conductor 71 are fixed in a surface contact state. An insulating cap 96 is attached to the third cylindrical part 913, and a conductive cover 97 is further installed, so that the fixing metal fitting 94 and the screw 95 are insulated from the outside air.

[0019] The insulating resin part 92 has a recess 921 into which the second central conductor 71 is inserted and a recess 922 into which the first central conductor 61 is inserted. The recess 921 is connected to the first cylindrical part 911 of the conductive resin part 91, and the recess 922 is connected to the second cylindrical part 912 of the conductive resin part 91.

[0020] The end face of the second central conductor 71 is in contact with the side face of the rounded rectangular prism at the end 611 of the first central conductor 61. That is, the second central conductor 71 and the first central conductor 61 are in surface contact. The first central conductor 61 and the second central conductor 71 are also electrically connected through the conductive resin part 91. Therefore, the first central conductor 61 and the second central conductor 71 are at the same potential, and no discharge occurs between the first central conductor 61 and the second central conductor 71.

[0021] 6 is a cross-sectional view showing a configuration of a tank connection part of a solid insulated busbar connection device according to the first embodiment. The tank connection parts 51 and 52 include a third central conductor 81, a conductive resin part 82 connecting the third central conductor 81 and the first central conductor 61, an insulating resin part 83 which is an insulating resin covering the third central conductor 81, an outer cover part 84 covering a part of the insulating resin part 83 exposed to the outside air, a fixing metal fitting 85 and a screw 86 which fix the first central conductor 61, an insulating cap 87 covering the fixing metal fitting 85 and the screw 86, and a conductive cover 88 which covers the insulating cap 87. One end part 811 of the third central conductor 81 protrudes from the insulating resin part 83. One end part 8111 of the third central conductor 81 is inserted into the holes 141a and 141b of the connecting conductors 14a and 14b.

[0022] The conductive resin part 82 is T-shaped with three intersecting cylinders, and includes a first cylinder part 821 in which the other end 812 of the third central conductor 81 is disposed, a second cylinder part 822 in which the first central conductor 61 is inserted, and a third cylinder part 823 in which the fixing metal fitting 85 is disposed. The first cylinder part 821 and the third cylinder part 823 are disposed coaxially, and the second cylinder part 822 is disposed perpendicular to the first cylinder part 821 and the third cylinder part 823.

[0023] When the first central conductor 61 is inserted into the second cylindrical portion 822, the side surface of the rounded rectangular column of the end portion 611 of the first central conductor 61 and the end face of the third central conductor 81 come into surface contact. With the end portion 611 of the first central conductor 61 inserted into the second cylindrical portion 822, a screw 86 is passed through the through hole 613 of the first central conductor 61 and the through hole 851 of the fixing bracket 85, and the screw 86 is screwed into the female thread 813, thereby fixing the first central conductor 61 and the third central conductor 81 in a surface contact state. An insulating cap 87 is attached to the third cylindrical portion 823, and a conductive cover 88 is further installed, so that the fixing bracket 85 and the screw 86 are insulated from the outside air.

[0024] The insulating resin part 83 includes a convex portion 831 having a convex shape corresponding to the concave shapes of the cup-shaped insulators 13a and 13b. The insulating resin part 83 also includes a concave portion 832 into which the first central conductor 61 is inserted. The concave portion 832 is connected to the second cylindrical portion 822 of the conductive resin part 82.

[0025] The end face of the third central conductor 81 is in contact with the side face of the rounded rectangular prism at the end 611 of the first central conductor 61. That is, the first central conductor 61 and the third central conductor 81 are in surface contact. The first central conductor 61 and the third central conductor 81 are also electrically connected through the conductive resin part 82. Therefore, the first central conductor 61 and the third central conductor 81 are at the same potential, and no discharge occurs between the first central conductor 61 and the third central conductor 81.

[0026] FIG. 7 is a cross-sectional view showing the configuration of the pressing part of the solid insulated busbar connection device according to the first embodiment. In FIG. 7, the tank connection parts 51, 52 are partially omitted from the illustration. The pressing parts 53, 54 include a support rod part 21 fixed to the tank lid plate flanges 11a, 11b of the tanks 1a, 1b, and a pressing plate part 22 installed on the support rod part 21. A male thread is formed on an end part 212 of the support rod part 21 opposite to an end part 211 fixed to the tank lid plate flanges 11a, 11b of the tanks 1a, 1b. A hole 221 into which the support rod part 21 can be inserted is formed in the pressing plate part 22, and the tank connection parts 51, 52 are pressed against the tanks 1a, 1b by fastening a nut 214 to the end part 212 with the end part 212 of the support rod part 21 passing through the hole 221. When the tank connection parts 51, 52 are pressed against the tanks 1a, 1b, the convex portions 831 of the insulating resin parts 83 of the tank connection parts 51, 52 are pressed against the cup-shaped insulators 13a, 13b via the insulating grease 15, thereby firmly fixing the tank connection parts 51, 52.

[0027] When installing the solid insulated busbar connection device 50, first, the vertical busbar parts 55, 57 and the horizontal busbar part 56 are connected in advance by the conductor connection parts 58, 59 to form the solid insulated busbar part 30. Next, the tank connection parts 51, 52 are inserted into the tanks 1a, 1b. After that, the solid insulated busbar part 30 is brought close to the tank connection parts 51, 52 from above, and the first central conductor 61 is inserted into the second cylindrical part 822. Then, with the end part 611 of the first central conductor 61 inserted into the second cylindrical part 822, a screw 86 is passed through the through hole 613 of the first central conductor 61 and the through hole 851 of the fixing bracket 85, and the screw 86 is screwed into the female thread 813. Furthermore, an insulating cap 87 is attached to the third cylindrical part 823, and then a conductive cover 88 is installed. By installing the solid-insulated busbar connection device 50 according to this procedure, it is no longer necessary to support the solid-insulated busbar section 30 from below when connecting the solid-insulated busbar section 30 to the tank connection sections 51, 52, and therefore the installation work of the solid-insulated busbar connection device 50 can be easily performed.

[0028] In addition, the vertical busbar portions 55, 57 of the solid insulated busbar portion 30 may be attached to the tank connection portions 51, 52 in advance, and the horizontal busbar portion 56 and the conductor connection portions 58, 59 may be assembled from above to the vertical busbar portions 55, 57. That is, by assembling from above the portion of the solid insulated busbar portion 30 including at least the horizontal busbar portion 56 and the conductor connection portions 58, 59 to the vertical busbar portions 55, 57 or the tank connection portions 51, 52 which are the portions of the solid insulated busbar portion 30 other than the horizontal busbar portion 56 and the conductor connection portions 58, 59, there is no need to support the solid insulated busbar portion 30 from below when installing the solid insulated busbar portion 30, and therefore the installation work of the solid insulated busbar connection device 50 can be easily performed.

[0029] In the solid insulated bus connection device of embodiment 1, the solid insulated bus section 30 is arranged between the tank connection section 51 connected to the tank 1a and the tank connection section 52 connected to the tank 1b. Therefore, by making the length of the first central conductor 61 of the vertical bus section 55 and the length of the first central conductor 61 of the vertical bus section 57 different, it is possible to connect electrical equipment installed at different heights.

[0030] Embodiment 2 8 is a cross-sectional view showing the configuration of a solid insulated bus connection device according to embodiment 2. In the solid insulated bus connection device according to embodiment 2, vertical bus sections 55, 57 are installed so as to extend downward from tank connection sections 51, 52, and horizontal bus section 56 is installed below tank connection sections 51, 52. The rest is the same as solid insulated bus connection device 50 according to embodiment 1, so duplicated explanations will be omitted.

[0031] In solid-insulated bus-bar connection device 50 according to the second embodiment, horizontal bus-bar portion 56 is installed lower than tank connection portions 51 and 52, and therefore the center of gravity can be lowered compared to solid-insulated bus-bar connection device 50 according to the first embodiment. Therefore, solid-insulated bus-bar connection device 50 according to the second embodiment can have improved earthquake resistance compared to solid-insulated bus-bar connection device 50 according to the first embodiment.

[0032] Embodiment 3 9 is a cross-sectional view showing the configuration of a solid-insulated bus-bar connection device according to embodiment 3. Solid-insulated bus-bar connection device 50 according to embodiment 3 differs from solid-insulated bus-bar connection device 50 according to embodiment 1 in that conductor connection portions 58, 59 include multi-contacts 40, and a first central conductor 61 and a second central conductor 71 are connected via the multi-contacts 40.

[0033] FIG. 10 is a top view of a multi-contact of a solid insulated busbar connection device according to the third embodiment. FIGS. 11 and 12 are cross-sectional views of the multi-contact of a solid insulated busbar connection device according to the third embodiment. The multi-contact 40 includes a cylindrical contact case 41 that covers an end 611 of a first central conductor 61, and a coil spring contact 42 that is installed in a groove formed on the inner peripheral surface of the contact case 41 and electrically connects the contact case 41 and the first central conductor 61. Chamfered surfaces 413 and 414 are formed on the outer periphery of an end 412 opposite to the end 411 on the side where the first central conductor 61 is inserted. The end face of the second central conductor 71 is in surface contact with the chamfered surface 413. Through holes 415 and 416 are formed in the chamfered surfaces 413 and 414, and the second central conductor 71 is fixed to the contact case 41 by screwing a bolt 44 into the female thread 713 through the spring washer 43 and the through holes 415 and 416. Note that Figure 11 shows the state in which the first central conductor 61 is inserted into the contact case 41 until it hits the bolt 44, and Figure 12 shows the state in which the first central conductor 61 is inserted into the contact case 41 so that it contacts only the coil spring contactor 42 that is installed closest to the end 411 of the contact case 41 on the side into which the first central conductor 61 is inserted.

[0034] The insertion length of the first central conductor 61 into the contact case 41 can be arbitrarily changed between an insertion length L1 in a state where the first central conductor 61 abuts against the bolt 44 as shown in Fig. 11 and an insertion length L2 in a state where the first central conductor 61 contacts only the coil spring contactor 42 installed closest to the end 411 of the contact case 41 where the first central conductor 61 is inserted as shown in Fig. 12. Therefore, the installation height of the tank connecting parts 51, 52 can be easily changed when the height of the horizontal busbar part 56 is used as a reference. Therefore, within the range adjustable by the multi-contact 40, the installation height of the tank connecting parts 51, 52 can be adjusted based on the height of the horizontal busbar part 56 to connect the tanks 1a, 1b.

[0035] The configurations shown in the above embodiments are merely examples of the contents, and may be combined with other known technologies. Parts of the configurations may be omitted or modified without departing from the spirit of the invention. [Explanation of symbols]

[0036] 1a, 1b tank, 11a, 11b tank cover plate flange, 12a, 12b, 832, 921, 922 recess, 13a, 13b cup-shaped insulator, 14a, 14b connection conductor, 15 insulating grease, 16a, 16b insulator fixing flange, 17a, 17b electric field relaxation ring shield, 19a, 19b main body, 21 support rod, 22 pressure plate, 30 solid insulated busbar, 40 multi-contact, 41 contact case, 42 coil spring contact, 43 spring washer, 44 bolt, 50 solid insulated busbar connection device, 51, 52 tank connection, 53, 54 pressure, 55, 57 vertical busbar, 56 horizontal busbar, 58, 59 conductor connection, 61 First central conductor, 62, 72, 83, 92 Insulating resin part, 63, 73, 84, 93 Jacket part, 71 Second central conductor, 81 Third central conductor, 82, 91 Conductive resin part, 85, 94 Fixing metal fitting, 86, 95 Screw, 87, 96 Insulating cap, 88, 97 Conductive cover, 141a, 141b, 221 Hole, 181a, 181b, 182a, 182b, 183a, 183b O-ring, 211, 212, 411, 412, 611, 711 End, 214 Nut, 413, 414 Chamfered surface, 415, 416, 613, 851, 941 Through hole, 713, 813 Female thread, 811 One end, 812 Other end, 821, 911 First cylindrical portion, 822,912 Second cylindrical portion, 823,913 Third cylindrical portion, 831 Convex shaped portion.

Claims

1. a pair of tank connection parts attached to each of two electric devices to be connected, and a solid insulated bus bar part installed between the tank connection parts; the solid insulated bus section includes a vertical bus section having a first central conductor covered with an insulating resin and installed so that the first central conductor extends in a vertical direction, and a horizontal bus section having a second central conductor covered with an insulating resin and installed so that the second central conductor extends in a horizontal direction, the first central conductor and the second central conductor are straight rod-shaped, an end portion of the first central conductor is formed into a rectangular prism shape with rounded corners; a side surface of an end of the first central conductor and an end face of the second central conductor abutting against each other in surface contact therewith.

2. a pair of tank connection parts attached to each of two electric devices to be connected, and a solid insulated bus bar part installed between the tank connection parts; the solid insulated bus section includes a vertical bus section having a first central conductor covered with an insulating resin and installed so that the first central conductor extends in a vertical direction, and a horizontal bus section having a second central conductor covered with an insulating resin and installed so that the second central conductor extends in a horizontal direction, the solid insulated bus portion has a conductor connection portion that connects the first central conductor and the second central conductor, The conductor connection portion is formed of a conductive material, the conductor connection portion includes a multi-contact having a cylindrical contact case into which the first central conductor is inserted, and a coil spring contactor disposed on an inner peripheral surface of the contact case to electrically connect the first central conductor and the contact case, A flat surface is formed on the outer periphery of the end of the contact case, an end face of the second central conductor abutting on the flat portion and making surface contact therewith.

3. 3. The solid insulated bus connection device according to claim 2, wherein the conductor connection portion includes a fastener for fastening the first central conductor and the second central conductor.

4. 4. The solid insulated busbar connection device according to claim 3, wherein the conductor connecting portion has an insulating cap covering the fastening metal fitting.

5. 5. The solid insulated bus connection device according to claim 1, wherein the horizontal bus section is disposed above the tank connection section.

6. 5. The solid insulated bus connection device according to claim 1, wherein the horizontal bus section is disposed below the tank connection section.

7. A tank connection device comprising a pair of tank connection parts attached to each of two electrical devices to be connected, and a solid insulated bus bar part installed between the tank connection parts; the solid insulated bus section includes a vertical bus section having a first central conductor covered with an insulating resin and installed so that the first central conductor extends in a vertical direction, and a horizontal bus section having a second central conductor covered with an insulating resin and installed so that the second central conductor extends in a horizontal direction, a pressing portion for pressing the tank connection portion against the tank of the electrical device, 2. A solid-insulated busbar connection device, comprising: a horizontal busbar portion disposed below the tank connection portion;