Busbar connection device, switchgear and method for connecting a busbar connection device

Abstract

busbar connecting device (1) comprising: a first through-line (6) which is attached to an inner wall surface (4b) of a first pressure vessel (4) and which is penetrated by a first inner through-line (14a), and which has: a first projecting part (6a) which extends outwards from the first pressure vessel (4), and a first connecting part (17a) which is exposed opposite the first projecting part (6a), a second through-passage (7) which is attached to an inner wall surface (5b) of a second pressure vessel (5) adjacent to the first pressure vessel (4) and which is penetrated by a second inner through-passage (14b), and which has: a second projecting part (7a) which extends outwards from the second pressure vessel (5), and a second connecting part (17b) which is exposed opposite the second projecting part (7a), a connecting conductor part (10, 22) which is made from a conductive element which connects the first connecting part (17a) and the second connecting part (17b) and which is provided between the first through-hole (6) and the second through-hole (7), and an intermediate tank (11) which has: a handhole (19) with an opening , and a cover (12) for sealing the handhole (19), wherein the intermediate tank (11) accommodates the first projecting part (6a), the second projecting part (7a) and the connecting conductor part (10, 22) in its own interior space in order to seal the accommodated parts, wherein the intermediate tank (11) has: a separate first edge surface (11c) that surrounds a separate first opening (18a) and is attached to an outer wall surface (4a) of the first pressure vessel (4), and a separate second edge surface (11d) which surrounds a separate second opening (18b) and which is attached to an outer wall surface (5b) of the second pressure vessel (5), and wherein the intermediate tank (11) has a first curved part (11a) and a second curved part (11b), each of which is provided in a circular shape of the circumferential edge of the first edge surface (11c) and the second edge surface (11d) and bends inwards in the direction of the passages (6, 7) as a space for allowing retaining devices (8, 9) to pass through for fastening the intermediate tank (11) to each of the outer wall surfaces of the first pressure vessel (4) and the second pressure vessel (5).

Description

Technical field

[0001] The present application relates to a busbar connection device used in a main circuit part of a gas-insulated switchgear used in a power receiving and transforming system, a switchgear assembly and a method for connecting a busbar connection device. Technological background

[0002] The switchgear used in a power receiving and transforming system (hereinafter referred to as "switchgear") is supplied with high-voltage current from an external source via cables, and generally consists of several switchgear units installed in parallel in a line unit. At the connection point between each switchgear unit at the installation site, the protruding portion of the insulating bushing, which is pre-installed on the inner wall surface of the pressure vessel in each adjacent individual switchgear unit, projects outwards from the pressure vessel, with the bushings being arranged to face each other, and with the end faces of the protruding portion of the bushing being electrically connected via an odd-numbered connecting element.It is well known that the foreground part of the bushings, which are arranged opposite each other, and that the circumference of the connecting elements are surrounded by a solid insulating adapter, and that the busbar connection device fulfills the electrical connection performance (see, for example, patent literature 1). State of the art document [patent literature] [Patent literature 1] WO2015 / 076029 A1 [Patent Literature 2] JP S6073309 U Disclosure of the invention Technical problem

[0003] The busbar connection device described in patent reference 1 is a solid insulating busbar type that uses a solid insulating adapter. The advantage of the busbar connection device described in patent reference 1 is that it does not require gas treatment when the switchgear is erected. However, since the connection part cannot be adjusted after the busbar is connected, it is necessary to precisely align the axes of the two bushings, which are arranged to face each other when erected. In other words, if the axes of the bushings are not precisely aligned, there is a risk that the connection component cannot be installed or that the surface pressure exerted on the bushing by the solid insulating adapter will be insufficient, resulting in a deterioration of the insulation performance.To pre-adjust the axes of the bushings, which are arranged facing each other, it is therefore necessary to precisely align them during the assembly phase of a single switchgear assembly. However, if the bushing is positioned high, the axis must be adjusted, which also presents a time-consuming problem during assembly. Furthermore, depending on the positional accuracy of the pre-installed bushing, there is a possibility that the busbar connection might not be possible, in which case extensive rework is required.

[0004] The present application was filed to solve the problems mentioned above, and it is an objective of the present application to provide a busbar connection device, a switchgear assembly and a method for connecting a busbar connection device, which improve the assembleability of the switchgear assembly and the operational capability of the line unit. Solution to the problem

[0005] The present application relates to a busbar connection device according to claim 1.

[0006] A method for connecting a busbar connection device is defined in claim 8. Advantageous effects of the invention

[0007] In accordance with the busbar connection device according to the present application, the busbar connection device can be easily assembled and the operational capability of the switchgear line unit can be improved. Furthermore, the structure of the intermediate tank makes it possible to reduce the size of the busbar connection device.

[0008] Furthermore, in accordance with the switchgear according to the present application, the number of gas treatments in the pressure vessel of the switchgear and in the intermediate tank of the busbar connection device can be reduced. Additionally, miniaturizing the busbar connection device allows the external size of the switchgear to be made more compact.

[0009] Furthermore, in the method for connecting a busbar according to the present application, the bus connection work can be carried out from the handhole of the intermediate tank, thus simplifying the assembly work. Moreover, since the contact resistance can be minimized by improving the bus connection performance, the main circuit resistance between the switchgear can be reduced. Brief description of the drawings [ Fig. 1] Fig. Figure 1 represents a diagram showing a complete switchgear assembly connected to a busbar connection device according to the first embodiment of the present application. [ Fig. 2] Fig. Figure 2 shows an enlarged cross-sectional view of a busbar connection device according to the first embodiment of the present application. [ Fig. 3] Fig. Figure 3 shows an enlarged cross-sectional view of a busbar connection device according to the present application. [ Fig. 4] Fig. Figure 4 shows a cross-sectional view from above of the busbar connection device according to the first embodiment of the present application. [ Fig. 5] Fig. Figure 5 shows a drawing of the intermediate tank of the busbar connection device according to the present application. [ Fig. 6] Fig. Figure 6 shows an enlarged cross-sectional view of a connecting conductor part of the busbar connection device according to the first embodiment of the present application. [ Fig. 7] Fig. Figure 7 represents a diagram showing an intermediate connection stage or phase of the busbar connection device according to the first embodiment of the present application. [ Fig. 8] Fig. Figure 8 shows a diagram illustrating the use of an adjustment holding device during the connection of the busbar connection device according to the first embodiment of the present application. [ Fig. 9] Fig. Figure 9 shows a cross-sectional view of an adjustment holding device used during the connection of the busbar connection device according to the first embodiment of the present application. [ Fig. 10] Fig. Figure 10 shows a cross-sectional view of the complete switchgear assembly connected to the busbar connection device according to the second embodiment of the present application. [ Fig. 11] Fig. Figure 11 shows an enlarged cross-sectional view of a busbar connection device according to a second embodiment of the present application. [ Fig. 12] Fig. Figure 12 shows an enlarged cross-sectional view of a connecting conductor part of the busbar connection device according to the second embodiment of the present application. [ Fig. 13] Fig. Figure 13 shows a diagram illustrating an intermediate connection stage or phase of the busbar connection device according to the second embodiment of the present application. [ Fig. 14] Fig. Figure 14 shows a diagram illustrating a switchgear assembly installed according to the second embodiment of the present application. [ Fig. 15] Fig. Figure 15 shows a diagram illustrating a switchgear assembly installed according to the third embodiment of the present application. [ Fig. 16] Fig. 16 represents a diagram showing a cross-section BB in Fig. 15 shows. Description of the embodiments

[0010] A first embodiment of the present application will be described below with reference to the drawings. First embodiment

[0011] Fig. Figure 1 shows a switchgear connected to a busbar system or current rail system according to the first embodiment of the present application. Fig. 1. Switchgear 2 and switchgear 3, which are separate switchgear units, ensure insulation within the pressure vessel by filling the first pressure vessel 4 and the second pressure vessel 5 with an insulating gas. The busbar connection device 1 is located above the connection area between switchgear 2 and the pressure vessel of switchgear 3. In this way, the adjacent switchgear units are connected to each other via a busbar connection device, and a plurality of adjacent switchgear units are connected in parallel (in the left-right direction). Fig. 1) set up to form a switching station for a power receiving and distribution system.

[0012] Fig. Figure 2 shows an enlarged view of a busbar connection device according to the first embodiment of the present application. Fig. Figure 3 represents a cross-sectional structure of the implementation according to the first embodiment of the present application. Fig. Figure 4 shows a cross-sectional view from above of the busbar connection device according to the first embodiment of the present application. Fig. Figure 5 is a drawing of an intermediate tank of the busbar connection device according to the present application.

[0013] In Fig. 2. The first bushing 6, which is attached to an inner wall surface 4b of the first pressure vessel 4 of the switchgear 2, and the second bushing 7, which is attached to the inner wall surface 5b of the second pressure vessel 5 of the switchgear 3, project outwards from the bushing openings of the first pressure vessel 4 and the second pressure vessel 5, respectively, and are arranged so that they are located on a coaxial extension line. Furthermore, a first connecting part 17a, which is exposed opposite the first projecting part 6a of the first bushing 6, and the second connecting part 17b, which is exposed opposite the second projecting part 7a of the second bushing 7, are electrically connected via a connecting conductor part 10, which consists of a plurality of conductive elements, and are thus formed a pair of bushing sets.

[0014] The cross-sectional structure of the implementation is described with reference to Fig. 3 will be described by taking the first feedthrough 6 as an example. The first feedthrough 6 has a feedthrough mounting surface 13 for attachment to the inner wall surface 4b of the first pressure vessel 4 at one end and a first projecting part 6a that extends outwards from the feedthrough opening on the wall surface of the first pressure vessel 4 at the other end, and is formed by a first inner through conductor 14a that penetrates the interior of the feedthrough insulating layer 15, which is made of a resin, such as epoxy, for insulating purposes. The first inner through conductor 14a becomes the first connecting part 17a at one end, which is exposed opposite the first projecting part 6a.Furthermore, within the feedthrough insulation layer 15, a constant distance is maintained at the outer edge of the first inner conductor 14a in the opening position of the wall surface of the first pressure vessel 4, and a tubular relaxation shield 16 for an electric field, made of a copper mesh or a conductive plastic, is embedded. The second feedthrough 7 has the same structure as the first feedthrough 6. The second feedthrough 7 has a structure where it is attached to the inner wall surface 5b of the adjacent second pressure vessel 5 and to the inner wall surface 5b, and a second connecting part 17b consisting of a second projecting part 7a, which projects outwards from the second pressure vessel 5, and an end of a second inner conductor 14b (shown in ). Fig. 2), which penetrates the interior, which is exposed opposite the second preceding part 7a. The second passage 7 is also provided with a relaxation shield for an electric field.

[0015] The busbar connection device 1 is again referred to Fig. 2 will be described. As in Fig. As shown in Figure 2, the intermediate tank 11 is installed in the connection area between the first pressure vessel 4 and the second pressure vessel 5 such that the entire first projecting part 6a, the second projecting part 7a, and the connecting ladder part 10 are stored in the interior. Both end faces of the intermediate tank 11 are attached to the outer wall surfaces of the first pressure vessel 4 and the second pressure vessel 5, respectively. A plurality of retaining devices 8 are attached to the outer wall surface 4a, which corresponds to the portion of the inner wall surface 4b of the first pressure vessel 4 where the first bushing 6 is attached, and a plurality of retaining devices 9 are attached as retaining devices to the outer wall surface 5a, which corresponds to the portion of the inner wall surface 5b of the second pressure vessel 5 where the second bushing 7 is attached. In the intermediate tank 11, the first fringe area 11c (in Fig. 5 shown), which is an end surface, is attached to the outer wall surface 4a of the first pressure vessel 4 by the retaining device 8 and the fastening nut 8a, wherein the second edge surface 11d (in Fig. 5 shown), which is the other end surface, is attached to the outer wall surface 5a of the second pressure vessel 5 by the retaining device 9 and the fastening nut 9a.

[0016] Furthermore, a handhole 19 is provided for connecting the connecting conductor part 10 to a surface that differs from both end surfaces of the intermediate tank 11. As in Fig. As shown in Figure 2, for example, a handhole 19 and a cover 12 for sealing the handhole 19 are provided on the upper surface of the intermediate tank 11. Furthermore, the interior can be filled with an insulating gas by attaching an adapter for gas treatment (not shown) to a surface that differs from both ends of the intermediate tank 11, which is attached to the outer wall surfaces of the first pressure vessel 4 and the second pressure vessel 5, or to the cover 12, wherein the intermediate tank 11 functions as a gas insulating pressure vessel.

[0017] Fig. 4 shows a cross-sectional view AA of the Fig. Figure 2 shows a cross-sectional view of the busbar connection device from above. As in Fig. As shown in Figure 4, when the bushing sets for three phases are aligned in parallel in the depth direction of the connection area between the switchgear, the intermediate tank 11 has a structure for storing the bushing sets for the three phases in the connection area in the interior.

[0018] Next, the detailed structure or construction of intermediate tank 11 will be described with reference to Fig. 5 will be described. Fig. Figure 5(a) shows the structure as viewed from the upper part of the intermediate tank 11. Fig. Figure 5(b) shows the structure of the first boundary surface 11c, which represents an end surface of the intermediate tank 11 attached to the first pressure vessel 4 of the switchgear 2. Furthermore, in Fig. 5(c) of the cross-section BB in Fig. 5(a) shown.

[0019] As in the Fig. 5(a) and Fig. As shown in Figure 5(b), both end faces (the first edge face 11c and the second edge face 11d) of the intermediate tank 11 have a first opening part 18a and a second opening part 18b, which are provided for the passage of the foreground part of the three-phase feedthroughs. As shown in Fig. As shown in Figure 5(b), the first edge surface 11c of the intermediate tank 11, which surrounds the first opening part 18a, has a structure comprising a plurality of retaining device through-holes 18c for passing the retaining device 8 on the side of the first pressure vessel 4, the outer circumference of the inner guide 21a for fixing the inner position of the gas sealing material, such as a gasket, the outer guide 21b for fixing the outer position, and the outer guide 21b. The second edge surface 11d of the intermediate tank 11, which surrounds the second opening part 18b attached to the second pressure vessel 5 of the switchgear 3, has the same structure and comprises a plurality of retaining device through-holes 18d (not shown) for passing the retaining device 9 on the side of the second pressure vessel 5.

[0020] As in the Fig. 5(a) and Fig. As shown in Figure 5(c), the handhole 19 is further provided on the upper surface of the intermediate tank 11. The handhole 19 is not only provided on the upper surface of the intermediate tank 11, but also on a surface that differs from both end surfaces, which have openings. The handhole 19 has an opening with a size that encompasses at least the connecting conductor part 10 in the plane of a normal projection, in order to carry out the connecting work of the connecting conductor part 10. As a result, even after the edge surfaces of both end faces of the intermediate tank 11 have been attached to the pressure vessel, the operator can carry out the connecting work from the handhole 19 using the connecting conductor part 10 in the intermediate tank 11. A gas sealing material, such as a gasket, is used to fix and seal the connection between the outer wall surface 4a of the first pressure vessel 4 and the intermediate tank 11, between the outer wall surface 5a of the second pressure vessel 5 and the intermediate tank 11, and between the lid 12 and the intermediate tank 11 to seal the handhole 19. In other words, the interior of the intermediate tank 11 is sealed, as the first opening 18a, the second opening 18b, and the handhole 19 on both end faces of the intermediate tank 11 are sealed.

[0021] As in the Fig. 5(a) and Fig. As shown in Figure 5(c), the intermediate tank 11 further comprises a first curved part 11a and a second curved part 11b, which bend inwards towards the feedthroughs, forming a space for passing through retaining devices which are attached to an outer wall surface of the first pressure vessel 4 and the second pressure vessel 5, each being provided circularly along the circumferential edges of the first edge surface 11c and the second edge surface 11d, respectively.

[0022] This is provided with a discharge shield 16 for an electric field in the feedthrough, as shown in Fig. As shown in Figure 3, due to the conduction effect for the electric field around the opening in the wall of the pressure vessel, it is possible to position the first curved part 11a and the second curved part 11b of the intermediate tank 11 close to the feedthrough. Since the space for the passage of the retaining device is located within the outer circumference of the intermediate tank 11, it is not necessary, according to the first curved part 11a and the second curved part 11b formed in the intermediate tank 11, to make the outer circumference of the edge region of both end faces of the intermediate tank 11 larger than that of the middle part, and the busbar connection device can be reduced in size.

[0023] By miniaturizing the busbar connection device that uses the intermediate tank of this structure, the area for attaching the stunt to the wall surface of the switchgear pressure vessel can also be reduced, making the external size of the switchgear more compact.

[0024] Next, the structure of the connecting conductor section 10 will be described, which consists of the multitude of conductive elements that are in Fig. 6 are shown. Fig. 6 The connecting conductor section 10 has a fitting structure comprising a cup-shaped socket conductor 10a and a rod-shaped plug conductor 10b. The socket conductor 10a is provided with a cup-shaped hole 10e, and the plug conductor 10b is provided with a cup-shaped hole 10f. The inner diameter of the cup-shaped socket conductor 10a is made substantially the same as the outer diameter of the rod-shaped plug conductor 10b. The plug conductor 10b is inserted into the socket conductor 10a and electrically connected by a sliding contact via a plurality of contacts 10h attached to the plug conductor 10b.

[0025] The first connecting part 17a of the first feedthrough 6 and the socket conductor 10a are connected by a bolt or screw 10c, and the second connecting part 17b of the second feedthrough 7 and the plug conductor 10b are connected by a bolt or screw 10d.

[0026] The first bushing 6 and the second bushing 7 are connected such that they face each other and lie on a coaxial extension line, parallel or vertical to the axis of the connecting element, with a permissible range of several millimeters to several tenths of a millimeter. As a result, even if a bushing misalignment occurs that is difficult to adjust at the location where the switchgear has been installed, the connection position can be set within the permissible range of the connecting conductor part 10. For example, as a method to compensate for the misalignment, the hole diameter of each component of the connecting conductor part 10 could be increased. In particular, in the connecting conductor section 10, the socket conductor 10a has the socket conductor 10a to reduce the misalignment of the feedthroughs with each other, wherein the hole diameter of the bolt hole 10i is several millimeters to several tenths of a millimeter larger than the diameter of the bolt 10c. Furthermore, the socket conductor 10a and the first connecting part 17a of the first feedthrough 6 are connected by the bolt 10c via a washer 10g, which is larger than the hole diameter of the bolt hole 10i.

[0027] Here, the connection method of the busbar connection device 1 according to the first embodiment will be described. Fig. Figure 7 represents a diagram showing an intermediate stage of the feedthrough connection of the busbar connection device 1.

[0028] As in Fig. As shown in Figure 7, the socket conductor 10a is previously connected to the first connecting part 17a of the first bushing 6 via a washer 10g using a bolt 10c. The plug conductor 10b, which is equipped with the contactor 10h, is connected to the second connecting part 17b of the second bushing 7 using a bolt 10d. However, at this stage, the socket conductor 10a and the first bushing 6 are not fully tightened, but tightened to the extent that they touch and move.

[0029] First, a gas sealing material, such as a gasket, is attached to the first pressure vessel 4 at the mounting point of the intermediate tank 11 on the outer wall surface 4a, corresponding to the mounting position of the first penetration 6. The retaining device 8, which is attached to the outer wall surface 4a, is then inserted into the retaining device through-hole 18c of the intermediate tank 11 and secured with the fastening nut 8a.

[0030] Next, as in Fig. 8 shown, from which in Fig. In the state shown in Figure 7, the pressure vessels of the switchgear are brought closer together, so that the distance between the socket conductor 10a and the plug conductor 10b is further increased to the shortest distance X of the gap required to tighten the bolt 10c.

[0031] In this phase, the fastening positions of the socket conductor 10a and the plug conductor 10b, which are located close to each other, are adjusted using the adjusting tool 50. Once the position adjustment is complete, the bolt 10c is fully tightened. The position adjustment using the adjusting tool 50 and the tightening of the bolt 10c are carried out from the handhole 19.

[0032] Next, the pressure vessels of the switchgear are brought even closer together, with the plug conductor 10b being fitted inside the socket conductor 10a, and the retaining device 9 also being fully inserted into the retaining device through-hole 18d of the intermediate tank 11 on the side of the second pressure vessel 5. Then, in the intermediate tank 11, the retaining device 9, which is attached to the outer wall surface 5a of the second pressure vessel 5, is inserted into the retaining device through-hole 18d of the intermediate tank 11 and secured with the fastening nut 9a. Finally, the handhole 19 is sealed with a cover 12 using a gas sealing material, such as a gasket, thus preventing the release of an insulating gas.

[0033] Next, the adjustment tool 50 will be described. Fig. Figure 9 shows a state when the adjusting tool 50 is used in the busbar connection device according to the first embodiment, and two cross-sectional views of the adjusting tool 50.

[0034] The adjusting tool 50 has a step 50a in the cross-section of the socket conductor 10a and the plug conductor 10b in the connection direction. If the outer diameter of the socket conductor 10a is the first outer diameter D1 and the outer diameter of the plug conductor 10b is the second outer diameter D2, the step 50a has a height of (D1-D2) / 2.

[0035] In cross-section DD on the side of the socket conductor 10a, the adjusting tool 50 has a first curved surface 50b that fits the first outer diameter D1 of the socket conductor 10a. Simultaneously, in cross-section CC on the side of the plug conductor 10b, the adjusting tool 50 has a second curved surface 50c that fits the second outer diameter D2 of the plug conductor 10b. Both the first curved surface 50b and the second curved surface 50c have an angle of 180° or less and feature a structure that allows them to be attached and detached.

[0036] According to the busbar connection device of the first embodiment, the busbar connection device can be easily assembled, and the operational efficiency of the switchgear line unit can be improved. Furthermore, the structure of the intermediate tank allows for a reduction in the size of the busbar connection device. Additionally, the miniaturization of the busbar connection device according to the first embodiment allows for a more compact external size of the switchgear. Moreover, according to the method for connecting a busbar according to the first embodiment, the bus connection work can be carried out from the access point of the intermediate tank, thus simplifying the assembly process. Second embodiment

[0037] Fig. Figure 10 shows a switchgear connected to a busbar connection device according to the second embodiment of the present application. The difference compared to the first embodiment lies in the structure of the connecting conductor part 22 of the busbar connection device 20 and in the method for connecting the bushing. Fig. Figure 11 shows an enlarged view of a busbar connection device according to the second embodiment of the present application. Since the structures of the first feedthrough 6 and the second feedthrough 7 are the same as those of the first embodiment, their description will be omitted. The first feedthrough 6 is attached to the inner wall surface 4b of the first pressure vessel 4 of the switchgear 2, with the second feedthrough 7 being attached in a similar manner to the inner wall surface 5b of the second pressure vessel 5 of the switchgear 3.

[0038] Furthermore, the structure of the intermediate tank 11 for storing the first projecting part 6a of the first passage 6, the second projecting part 7a of the second passage 7 and the connecting conductor part 2 is the same as that of the first embodiment.

[0039] The second embodiment does not have the connecting conductor part 10 with a fitting structure of the cup-shaped socket conductor 10a and the rod-shaped plug conductor 10b as in the first embodiment, wherein the connecting conductor part 22 consists of a plurality of conductor parts and fastening elements. Fig. Figure 12 shows an enlarged cross-sectional view of the connecting conductor part 22 of the busbar connection device 20. Fig. 12. The connecting conductor section 22 consists of the first conductor section 22a, which is attached to the first connecting part 17a of the first projecting part 6a of the first penetration 6 by the first fastening element 22c, and of the second conductor section 22b, which is attached to the second connecting part 17b of the second projecting part of the second penetration 7 by the second fastening element 22d. Furthermore, the first conductor section 22a and the second conductor section 22b are connected by a third fastening element 22e. The first fastening element 22c, the second fastening element 22d, and the third fastening element 22e are metallic conductive elements, and bolts or screws, for example, are used.

[0040] The first bushing 6 and the second bushing 7 are connected so that they face each other and are thus on a coaxial extension line in the parallel or vertical direction of the connecting element axis, with a permissible range of a few millimeters to several tenths of a millimeter. Even if a bushing offset occurs that is difficult to adjust at the location where the switchgear has been installed, it can ultimately be adjusted by the connecting conductor section 10. Here, the positions of the first fastening element 22c, the second fastening element 22d, and the third fastening element 22e can be adjusted within the permissible range of the fastening or mounting position.In particular, one method for addressing the deviation is to increase the hole diameter of the component of the connecting conductor part 22 or to increase the number of components of the connecting conductor part 22. For example, by increasing the clearance between the first conductor part 22a and the second conductor part 22b with respect to the bolt, the structure is such that the first through-hole 6 and the second through-hole 7 can be connected even if they are misaligned.

[0041] Here, the connection method of the busbar connection device 20 according to the second embodiment will be described. Fig. Figure 13 shows an intermediate stage of the bushing connection of the busbar connection device 20. First, a gas sealing material, such as a gasket, is attached to the mounting part of the intermediate tank 11 on the outer wall surface 4a, corresponding to the bushing mounting position of the first pressure vessel 4 of the switchgear 2. Similarly, a gas sealing material, such as a gasket, is attached to the mounting part of the intermediate tank 11 on the outer wall surface 5a, corresponding to the bushing mounting position of the second pressure vessel 5 of the switchgear 3.

[0042] First, the retaining device 8, which is attached to the outer wall surface 4a, is inserted into the retaining device through-hole 18c of the intermediate tank 11, and the intermediate tank 11 is secured by the fastening nut 8a.

[0043] Next, the retaining device 9, which is attached to the outer wall surface 5a according to the feedthrough mounting position of the second pressure vessel 5 in the switchgear 3, is brought closer so that it can be inserted into the retaining device through-hole 18d of the intermediate tank 11. After the retaining device 9 has been fully inserted into the retaining device through-hole 18d, the retaining device through-hole 18c and the retaining device 9 are secured with the fastening nut 9a.

[0044] Furthermore, as in Fig. Figure 12 shows that the first conductor part 22a, the second conductor part 22b, the first fastening member 22c, the second fastening member 22d, and the third fastening member 22e are used from the handhole 19 of the intermediate tank 11, connecting the first connecting part 17a of the first through-hole 6 and the second connecting part 17b of the second through-hole 7, which are arranged so that they face each other. After the connection work is completed, the handhole 19 is sealed with a cover 12 over a gas sealing material, such as a gasket, and an insulating gas is enclosed.

[0045] According to the busbar connection device of the second embodiment, the busbar connection device can be assembled more easily, and the operational reliability of the switchgear line unit can be improved. Furthermore, the structure of the intermediate tank allows for a reduction in the size of the busbar connection device. Additionally, the miniaturization of the busbar connection device according to the first embodiment allows for a more compact external size of the switchgear.

[0046] Furthermore, according to the method for connecting a busbar according to the second embodiment, the bus connection work can be carried out from the handhole of the intermediate tank, thus simplifying the assembly work. Moreover, since the contact resistance can be minimized by improving the bus connection performance, the main circuit resistance between the switchgear can also be reduced. Third embodiment

[0047] In the first and second embodiments, the first pressure vessel 4 of the adjacent switchgear 2, the second pressure vessel 5 of the switchgear 3, and the intermediate tank 11 of the busbar connection device are separate, closed containers. In other words, these sealed pressure vessels are in a state where they are independently partitioned, thus reducing the number of gas treatments required for the number of pressure vessels. For example, in Fig. As shown in Figure 14, in the individual line unit form of the four switchgear assemblies 23 to 26, since there are four pressure vessels 27 to 30 and intermediate tanks 31 to 33 of the busbar connection device, i.e. a total of seven pressure vessels, gas treatment is required seven times, and it is necessary to attach the gas filling device 45 to each of the seven pressure vessels.

[0048] In the third embodiment, as in Fig. As shown in Figure 15, in the individual line unit form consisting of the four pressure vessels 38 to 41, for example only one gas filling device 15 is mounted on the four pressure vessels 38 to 41 and the intermediate tanks 42 to 44 of the three busbar connection devices.

[0049] Fig. 16 represents a diagram showing a cross-section BB in Fig. 15 shows. As in Fig. As shown in Figure 16, one or more through-holes 47, penetrating the wall surface of the pressure vessel, are provided on the wall surface 46 of the pressure vessel, which is covered with the openings of the respective end faces of the intermediate tanks 42 to 44 of the busbar connection device. As a result, the four pressure vessels 38 to 41, which are in Fig. Figure 15 shows the intermediate tanks 42 to 44 of the three busbar connection devices as the same gas compartment. Even in configurations where multiple switchgear units are arranged in a row, gas treatment can therefore be carried out all at once by attaching the gas filling device 45 either to the pressure vessel or the intermediate tank. Furthermore, not all pressure vessels and the intermediate tank are located in the same gas compartment; rather, only some pressure vessels that require to be in the same gas compartment could be provided with through-holes in the wall surface.

[0050] The in Fig.The busbar connection device shown in Figure 15 has the structure of the connecting conductor part 22 of the second embodiment. Similarly, with the connecting conductor part 10, as in the first embodiment, it is possible to separate or partition a plurality of pressure vessels and an intermediate tank using the same gas. According to the busbar connection device and the method connecting a bus according to the third embodiment, it has the same effect as those of the first and second embodiments. Furthermore, according to the switchgear of the third embodiment, since the wall surface of the pressure vessel of the switchgear is provided with a through-hole that penetrates the intermediate tank, the gas treatment of the pressure vessel and the intermediate tank, which must be located in the same gas compartment, can be carried out simultaneously.As a result, the number of gas treatments in the switchgear pressure vessel and in the intermediate tanks of the busbar connection device can be reduced, thereby simplifying the switchgear assembly work. Reference symbol list 1, 20 Busbar connection device 2 Switchgear 3 Switchgear 4 first pressure vessel 4a Outer wall surface of the first pressure vessel 4b Inner wall surface of the first pressure vessel 5 second pressure vessel 5a Outer wall surface of the second pressure vessel 5b Inner wall surface of the second pressure vessel 6 first implementation 6a first preceding part 7 second execution 6a second preceding part 8, 9 Holding device 8a, 9a Nut 10, 22 conductor connecting element 10a Socket header 10b Plug conductor 10c, 10d bolts 10th cup-shaped hole 10f cup-shaped hole 10g washer 10h Contact manufacturer 10i bolt hole 22a first ladder section 22b second ladder section 22c first fastening element 22d second fastening element 22e third fastening element 11 Intermediate tank 11a first curved part 11b second curved part 11c first boundary surface 11d second boundary surface 12 lids 13 Installation area 14a first inner conductor 14b second inner tube 15 Penetration insulation layer 16 Shielding for electric fields 17a first connecting part 17b second connecting part 18a first opening part 18b second opening part 18c, 18d Hole holding device 19 handhole 21a inner guidance 21b outer guidance 23, 24, 25, 26, 34, 35, 36, 37 Switchgear 27, 28, 29, 30, 38, 39, 40, 41 Pressure vessels 31, 32, 33, 42, 43, 44 Intermediate tank of the busbar connection device 45 Gas filling device 46 wall surface 47 Through hole 50 Adjustment tool 50a Level difference 50b first curved surface 50c second curved surface

Claims

[1] Busbar connecting device (1) comprising: a first through-line (6) which is attached to an inner wall surface (4b) of a first pressure vessel (4) and which is penetrated by a first inner through-line (14a), and which has: a first projecting part (6a) which extends outwards from the first pressure vessel (4), and a first connecting part (17a) which is exposed opposite the first projecting part (6a), a second through-passage (7) which is attached to an inner wall surface (5b) of a second pressure vessel (5) adjacent to the first pressure vessel (4) and which is penetrated by a second inner through-passage (14b), and which has: a second projecting part (7a) which extends outwards from the second pressure vessel (5), and a second connecting part (17b) which is exposed opposite the second projecting part (7a), a connecting conductor part (10, 22) which is made from a conductive element which connects the first connecting part (17a) and the second connecting part (17b) and which is provided between the first through-hole (6) and the second through-hole (7), and an intermediate tank (11) which has: a handhole (19) with an opening , and a cover (12) for sealing the handhole (19), wherein the intermediate tank (11) accommodates the first projecting part (6a), the second projecting part (7a) and the connecting conductor part (10, 22) in its own interior space in order to seal the accommodated parts, wherein the intermediate tank (11) has: a separate first edge surface (11c) that surrounds a separate first opening (18a) and is attached to an outer wall surface (4a) of the first pressure vessel (4), and a separate second edge surface (11d) which surrounds a separate second opening (18b) and which is attached to an outer wall surface (5b) of the second pressure vessel (5), and wherein the intermediate tank (11) has a first curved part (11a) and a second curved part (11b), each of which is provided in a circular shape of the circumferential edge of the first edge surface (11c) and the second edge surface (11d) and bends inwards in the direction of the passages (6, 7) as a space for allowing retaining devices (8, 9) to pass through for fastening the intermediate tank (11) to each of the outer wall surfaces of the first pressure vessel (4) and the second pressure vessel (5). [2] Busbar connection device according to claim 1, wherein a plurality of feedthrough sets, each comprising the first feedthrough (6) and the second feedthrough (7), are connected to each other by the connecting conductor part (10, 22), and the intermediate tank (11) accommodates the multitude of feedthrough sets within its own interior. [3] Busbar connection device according to claim 2, wherein the handhole (19) is provided on the intermediate tank (11) and has an opening which has a size which in the plane of a vertical projection includes at least the connecting conductor part (10). [4] Busbar connection device according to one of claims 1 to 3, wherein the connecting conductor part (10) consists of a matching and connecting cup-shaped socket conductor (10a) attached to the first connecting part (17a) and of a rod-shaped plug conductor (10b) attached to the second connecting part (17b) and fitted into the socket conductor (10a). [5] Busbar connection device according to one of claims 1 to 3, wherein the connecting conductor part (22) has a first conductor part (22a) which is attached to the first connecting part (17a) by a first fastening element (22c), and a second conductor part (22b) which is attached to the second connecting part (17b) by a second fastening element (22d), the first conductor part (22a) and the second conductor part (22b) are connected by a third fastening element (22e), and a position of the connecting conductor part (22) can be set within the permissible range of the mounting positions of the first fastening member (22c), the second fastening member (22d) and the third fastening member (22e). [6] Switchgear, wherein a connection area is formed between adjacent pressure vessels (4, 5), a busbar connection device according to one of claims 1 to 5 is arranged in the connection area, and the adjacent pressure vessels (4, 5) are connected to each other. [7] Switchgear according to claim 6, wherein a through-hole (47) penetrating the wall surface of the pressure vessel (4, 5) is provided on the wall surface of the pressure vessel (4, 5), which is covered with the openings (18a, 18b) of the intermediate tank (11) of the busbar connection device, and the intermediate tank (11) and the pressure vessels (4, 5) are located in the same gas compartment. [8] Method for connecting a busbar connection device comprising: Leaving one end of a first feedthrough (6) protruding from a feedthrough opening of a first pressure vessel (4) to the outside, where the other end of the first feedthrough (6) is attached to the inner wall surface (4b) of the first pressure vessel (4), Allowing one end of a second through-hole (7) to protrude from a through-hole of a second pressure vessel (5) to the outside, where the other end of the second through-hole (7) is attached to the inner wall surface (5b) of the second pressure vessel (5) adjacent to the first pressure vessel (4) in order to be facing the first through-hole (6), Fixing a second outer edge surface (11d) of an intermediate tank (11) to an outer wall surface (5a) of the second pressure vessel (5) according to the mounting position of the second feedthrough (7), where a first outer edge surface (11c) of the intermediate tank (11) is attached to an outer wall surface (4a) of the first pressure vessel (4) according to the mounting position of the first feedthrough (6), Connecting a connecting conductor section (10) between the first through-hole (6) and the second through-hole (7) from a handhole (19) provided in the intermediate tank (11), After the connection work is completed, the handhole (19) is sealed with a cover (12) and then an insulating gas is filled into the interior of the intermediate tank, whereby which exhibits: Attaching a cup-shaped mounting conductor (10a) having a first outer diameter to a first connecting part (17a) of the first through-hole (6), Attaching a rod-shaped plug conductor (10b) having a second outer diameter to a second connecting part (17b) of the second feedthrough (7), Adjusting the fixed positions of the socket conductor (10a) and the plug conductor (10b) using an adjusting tool (50) having a first curved surface (50b) that fits the first outer diameter and a second curved surface (50c) that fits the second outer diameter, and electrically connecting the first connecting part (17a) and the second connecting part (17b), wherein the plug conductor (10b) is inserted inside the socket conductor (10a).

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