Connection of laminated busbars between adjacent sections with limited rear access

Abstract

A conductor (1) for electrically connecting two adjacent laminated busbars (2a, 2b) of a switchgear, comprising a front part (3) and a rear part (4) and a pressure clamp (5, 6) for pressing the front part (3) and the rear part (4) onto the laminated busbars (2a, 2b), wherein the front part (3) comprises at least one front conductive bridge (3a) and wherein the rear part (4) comprises at least one rear conductive bridge (4a), characterized in that the rear part (4) is movable relative to the front part (3), wherein the front part (3) comprises an actuator (8) which can be coupled to a counterpart (9) of the rear part (4), and wherein moving the actuator (8) causes the rear part (4) to move toward the front part (3), thereby achieving the purpose of allowing conductive connection and disconnection of the laminated busbars when access from the rear side of the switchgear or switchboard is limited and preventing damage to the laminated busbars and the switchgear or switchboard.

Description

Technical Field

[0001] The present invention relates to a conductor for electrically connecting two adjacent laminated busbars of a switchgear, the conductor comprising a front part and a rear part and a pressure clamp for pressing the front part and the rear part onto the laminated busbars, wherein the front part comprises at least one front conducting bridge piece and wherein the rear part comprises at least one rear conducting bridge piece. Background Art

[0002] Laminated busbars are used in switchgear to conduct electric current. Laminated busbars comprise a plurality of layers of conductive sheets which are separated from each other by electrically insulating sheet materials. Laminated busbars are flat and can conduct several phases of electric current, wherein the number of phases depends on the number of conductive sheets. Laminated busbars are shown, for example, in DE 10 2005 015 945 B4.

[0003] Such laminated busbars are usually arranged at the rear side of a switchgear or a switchboard or a housing. If certain sections of a switchgear or several switchgears have to be connected, different laminated busbars have to be connected to each other in order to conduct the current from one section to another or from one switchboard to another. Each conductive sheet of a first laminated busbar has to be electrically connected to the corresponding conductive sheet of an adjacent second laminated busbar by a so-called shipping split connection (or shipping split connection), which includes further conductive sheets acting as links or bridges, i.e. conductive bridges.

[0004] If such laminated busbars are arranged at the rear side of a switchgear or switchboard or housing, access to those busbars may be difficult. For that matter, connection and disconnection of the busbars may also be difficult. Summary of the invention

[0005] It is therefore an object of the present invention to allow conductive connection and disconnection of laminated busbars with limited access from the rear side of a switchgear or switchboard and to prevent damage to the laminated busbars and the switchgear or switchboard.

[0006] This object is achieved according to the invention by the features of claim 1 .

[0007] According to the claim, the rear part is movable relative to the front part, wherein the front part comprises an actuator which can be coupled to a counterpart of the rear part and wherein moving or actuating the actuator moves the rear part toward the front part.

[0008] Firstly, it has been found according to the present invention that a conductor is used to provide a conductive bridge between laminated busbars of adjacent sections. This conductor, also referred to as a transport separation connection by those skilled in the art, comprises a front part and a rear part and also comprises a pressure clamp. The front part provides a connection between the phases L1 and L2 of adjacent laminated busbars and the rear part provides a connection between the L3 phase. In the case of a four-pole device, the rear part connects the L3 and L4 phases (neutral). When the contact area of ​​the conductor overlaps with the contact area of ​​the laminated busbar, pressure is applied by tightening the bolts of the pressure clamp to ensure a conductive connection between the phases of the laminated busbars arranged in adjacent sections.

[0009] Furthermore, it has been found that currently, the assembly process using such conductors requires at least two workers and access from the rear side of the switchgear or switchboard. When the segments are aligned and their frames are connected together, one operator holds the rear of the conductor on the rear side of the laminated busbar and the second operator holds the front of the conductor on the front side of the laminated busbar. When the two parts of the conductor are in the correct position, the operator adds a pressure clamp and tightens it by bolts to ensure the conductive connection between adjacent laminated busbars.

[0010] Furthermore, it has been found that such a solution cannot be used if there is limited or unfeasible access from the rear side of the switchgear or switchboard, which is often the case when the switchgear sections are already installed at a customer site.

[0011] Sometimes it is also necessary to dismantle a section on site, but without access from the rear side of the switchgear or switchboard it would be difficult or even impossible to remove the conductors or transport disconnect connections without damage.

[0012] The present invention solves these drawbacks in such a way that no rear access is required to connect and disconnect the laminated busbars. The present invention uses a rear pre-assembly.

[0013] Advantageously, the actuator is a bolt which engages in an inlet or an insert nut of the rear part and meshes with the thread of the inlet or the insert nut. By actuating, turning or moving the bolt, the rear part is moved in the direction of the front part without any access to the rear side of the housing of the switchgear or switchboard.

[0014] Advantageously, the actuator pulls the rear part in the direction of the front part against the force of the elastic body (or spring). Disassembly is also easy in this way. The force of the elastic body pushes the rear part away from the front part and creates a spacing between these parts and also between the rear part and the laminated busbar. The rear part is pushed away from the rear side of the laminated busbar. The conductive bridges of the rear part are then away from the electrical contact area of ​​the conductive sheets of the laminated busbar.

[0015] Advantageously, the elastic body is a spiral elastic body and surrounds the guide rod, wherein the spiral elastic body abuts on the head of the guide rod with a first end and abuts on the retaining frame with a second end. Thus, the rear part is guided in a defined manner and the laminated busbar and the rear part are protected from damage.

[0016] Further advantageously, the rear part is connected to a holder and is movable relative to the holder, wherein the holder can be connected to the frame of the switchgear or switchboard or housing by means of a fixing device. Thus, the rear part can be part of a preassembled device, which is attached to the frame of the switchgear or switchboard or housing. In this regard, a preassembly of the rear part is used. Before the segments are aligned and connected together, a preassembly of the conductor or transport breakaway connection using a pressure clamp can be used, preferably into the left-hand segment.

[0017] Advantageously, the clamp is connected to the support frame, one of the support frames being connected to the front and / or one of the support frames being connected to the rear. The support frame is a preassembled component using the clamp, which can be connected to the rear or the front in an easy manner. Preferably, the support frame is made of metal.

[0018] Further advantageously, the clamp is fixed in position on the support frame by a fixing support frame. One or more fixing supports can be screwed to the support frame with the clamp. The fixing support frame can be arranged between two clamps and can space these clamps apart from each other. The fixing support frame can be made of metal.

[0019] Advantageously, the rear part is part of a preassembled device connected to a holder. Thereby, the rear part can be attached to the frame of the switchgear or switchboard or housing by means of the holder. When the rear part and the front part are moved to the laminated busbar, no worker is required on the rear side of the housing or switchgear.

[0020] Further advantageously, the support frame is glued to the rear part and / or the support frame is glued to the front part. The glue or adhesive is easy to apply.

[0021] Advantageously, a device comprises a housing with a frame, wherein a holder is connected to the frame, at least one laminated busbar and a conductor as described herein, wherein a rear portion is connected to the holder and wherein the rear portion is movable relative to the holder.

[0022] The switchgear is preferably a low-voltage switchgear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the attached picture:

[0024] Figure 1Schematically shows a sheet metal console which is glued to the front or rear of a conductor or a transport breakaway connection, wherein contact areas for applying glue are provided,

[0025] Figure 2 Shows Figure 1 a sheet metal support frame, wherein the clamp is placed at a defined position on the sheet metal support frame,

[0026] Figure 3 The clamps are shown to be fixed in their defined position by two fixing supports which can be screwed to the sheet metal support,

[0027] Figure 4 schematically shows a rear view of the installation process of the rear part of a transport-break connection, wherein the laminated busbars are arranged in the left-hand section and wherein a holder for preassembling the rear part of the transport-break connection is provided and wherein slots for vertical position adjustment of the holder are provided,

[0028] Figure 5 Schematically shows Figure 4 a rear view of a transport-split connection, wherein a guide rod with an elastic body is arranged and wherein a pressure plate or a clamp is provided at the rear of the transport-split connection,

[0029] Figure 6 Shown from above Figure 5 A detailed cross-sectional view of the rear portion of

[0030] Figure 7 The electrical connection of two adjacent laminated busbars after segment alignment is shown, wherein the bolts are tightened by turning and the rear of the feed-break connection is pulled to the front and an electrically conductive bridge is formed between the adjacent laminated busbars. DETAILED DESCRIPTION

[0031] Figure 7A conductor 1 for electrically connecting two adjacent laminated busbars 2a, 2b of a switchgear, also called a transport-split connection, is shown, comprising a front part 3 and a rear part 4 and a pressure fixture 5, 6 for pressing the front part 3 and the rear part 4 onto the laminated busbars 2a, 2b, wherein the front part 3 comprises at least one front conductive bridge piece 3a and wherein the rear part 4 comprises at least one rear conductive bridge piece 4a. Those conductive bridge pieces 3a, 4a are in overlapping contact with the respective electrical contact areas 7 of the laminated busbars 2a, 2b to conduct current from one laminated busbar 2a to the other laminated busbar 2b. Each respective conductive piece of the left laminated busbar 2a is electrically connected to the respective conductive piece of the right laminated busbar 2b via the conductor 1, wherein those conductive pieces or more properly their blank contact areas face each other and are arranged coplanarly. The conductor 1 acts as a bridge between those conductive pieces facing each other. The front side F and the rear side R of the switching device are located at different sides of the conductor 1 .

[0032] The rear portion 4 can be oriented relative to the front portion 3. Figure 7 4 , wherein the front part 3 comprises an actuator 8 which can be coupled to a counterpart 9 of the rear part 4 and wherein the actuator 8 is moved or actuated to move the rear part 4 to the front part 3 .

[0033] The actuator 8 is a bolt that engages in the inlet of the rear part 4 and meshes with the thread of the inlet. The inlet is the counterpart 9. The bolt is turned to move the rear part 4.

[0034] Figure 6 It is shown that the actuator 8 pulls the rear part 4 in the direction of the front part 3 against the force of the elastic body 11. The elastic body 11 forms a distance D of 20 mm between the respective contact areas of the rear conductive bridge 4a and the conductive sheet 10 of the laminated busbar 2a. The elastic body 11 is a spiral elastic body and surrounds the guide rod 12, wherein the spiral elastic body abuts with a first end on the head of the guide rod 12 and with a second end on the holder 13. The rear part 3 is connected to the holder 13 and can be moved relative to the holder 13, wherein the holder 13 is connected to the frame 14 of the switchgear or switchboard or housing via a fixing device.

[0035] Figure 7 The clamps 5 , 6 are shown connected to support frames 15 , one of which is connected to the front part 3 and one of which is connected to the rear part 4 .

[0036] Figure 6 and Figure 7 It is shown that the rear part 4 is part of a preassembled component which is connected to the holder 13 . Figure 2 It is schematically shown that the clamps 5, 6 are fixed in position on each support frame 15 by means of a fixing support frame 16. One support frame 15 is glued to the rear part 4 and the other support frame 15 is glued to the front part 3.

[0037] In this regard, Figure 7 A device is shown, which comprises a housing with a frame 14, wherein a holder 13 is connected to the frame 14 at least on the laminated busbars 2a, 2b and the conductor 1, wherein the rear part 4 is connected to the holder 13 and wherein the rear part 4 can be moved relative to the holder 13 in the direction of the front part 3, i.e. in the direction of the front side F.

[0038] Figure 1 A sheet metal support 15 is shown which can be glued or is glued to the delivery breakaway connection, ie the front part 3 or the rear part 4 of the conductor 1 described here, wherein contact areas 15a for applying glue are provided.

[0039] Figure 2 Shows Figure 1 The sheet metal support 15 is a sheet metal support frame 15, wherein the clamps 5, 6 are placed in defined positions on the sheet metal support frame 15. The pressure clamps 5, 6 are assembled to two parts: the front part 3 and the rear part 4 of the conductor 1 by means of the sheet metal support frame 15. The sheet metal support frame 15 is glued to the rear part 4, and the pressure clamps 5, 6 are then placed and secured in the appropriate position by two smaller fixing supports 16.

[0040] Figure 3 It is shown that the four clamps 5, 6 are fixed in their defined positions by means of the two fixing supports 16, which can be screwed to the sheet metal support 15. The support 15 thus comprises holes 17 for fixing the fixing supports 16. The pressure clamp 6 with the embedded nut 6a is assembled to the rear part 4 of the conductor 1 and the pressure clamp 5 with the hole 5a for the bolt 8 is assembled to the front part 3 of the conductor 1, as by Figure 7 As shown.

[0041] Figure 4 A rear view of the installation process of the rear part 4 of the conductor 1 is schematically shown, wherein the laminated busbar 2a is arranged in the left hand section and wherein a holder 13 for preassembling the rear part 4 of the transport breakaway connection and wherein slots 18 for vertical position adjustment of the holder 13 are provided.

[0042] Figure 5 Schematically shows Figure 4 , in which a guide rod 12 with an elastomer 11 is arranged and in which the rear part 4 of the conductor 1 is provided with a pressure plate or clamp 6. A sheet metal support frame 15 is assembled to the left hand side section of the switchgear device. Its purpose is to hold the rear part 4 of the conductor 1 in the correct position with the pressure clamp 6 and to protect the conductor 1 and the components of the laminated busbar 2a from damage during the section alignment process.

[0043] In order to prevent damage to the conductor 1 or the laminated busbars 2a, 2b during the segment alignment, the holder 13 of the rear portion 4 of the conductor 1 includes a guide rod 12 that allows the rear portion 4 of the conductor 1 to move in the front and rear directions, and an elastic body 11 that pushes the rear portion 4 of the conductor 1 to the rear side R to prevent collision with the laminated busbar 2b of the adjacent segment during the segment alignment. The holder 13 of the conductor 1 can compensate for vertical misalignment and can ensure correct conductor overlap of the conductor 1 and the laminated busbars 2a, 2b.

[0044] After the segments or laminated busbars 2a, 2b are aligned and connected, the front part 3 of the conductor 1 is placed in the correct position from the segment front side F using a pressure plate or clamp 5, the bolts 8 are inserted into the clamp 5 and by tightening the bolts 8, the rear part 4 of the conductor 1 is pulled towards the laminated busbar contact area and provides conductive contact between adjacent laminated busbars 2a, 2b.

[0045] The switchgear is preferably a low voltage switchgear.The switchgear comprises a housing with a frame 14 as described above.

[0046] Reference numerals list

[0047] 1 Conductor or transmission separation connection

[0048] 2a, 2b Laminated busbar (left, right)

[0049] 3 1 front

[0050] 3a Front conduction bridge

[0051] 4 1 rear

[0052] 4a Back conduction bridge

[0053] 5 3 clamp

[0054] 5a 5 holes

[0055] 6 4 clamp

[0056] 6a 6 embedded nut

[0057] 7 Contact area 2a or 2b

[0058] 8 Bolts

[0059] 9 Matching parts

[0060] 10 2a conductive sheet

[0061] 11 Elastomer

[0062] 12 Guide rod

[0063] 13 Cage

[0064] 14 Framework

[0065] 15 Support frame

[0066] 15a Contact area for applying glue

[0067] 16 Fixed support frame

[0068] 17 15 holes

[0069] 18 13 or 14 slots

[0070] F Front

[0071] R rear side.

Claims

1. A conductor (1) for electrically connecting two adjacent laminated busbars (2a, 2b) of a switchgear, comprising a front part (3) and a rear part (4) and a pressure clamp (5, 6) for pressing the front part (3) and the rear part (4) onto the laminated busbars (2a, 2b), wherein the front part (3) comprises at least one front conducting bridge piece (3a) and wherein the rear part (4) comprises at least one rear conducting bridge piece (4a), It is characterized in that The rear part (4) is movable relative to the front part (3), wherein the front part (3) comprises an actuator (8) which can be coupled to a counterpart (9) of the rear part (4), and wherein moving the actuator (8) causes the rear part (4) to move toward the front part (3), wherein the actuator (8) pulls the rear part (4) in the direction of the front part (3) against the force of an elastic body (11).

2. The conductor according to claim 1, characterized in that The actuator (8) is a bolt that engages in an inlet or an embedded nut (6a) of the rear part (4) and meshes with the thread of the inlet or embedded nut (6a).

3. The conductor according to claim 1, characterized in that The elastic body (11) is a spiral elastic body and surrounds the guide rod (12), wherein the spiral elastic body abuts on the head of the guide rod (12) with a first end and abuts on the retaining frame (13) with a second end.

4. The conductor according to any one of claims 1 to 3, characterized in that The rear part (4) is connected to a holder (13) and is movable relative to the holder (13), wherein the holder (13) is connectable to a frame (14) of a switchgear or a switchboard or a housing via a fixing device.

5. The conductor according to any one of claims 1 to 3, characterized in that The clamps (5, 6) are connected to support frames (15), one of the support frames (15) being connected to the front part (3) and / or one of the support frames (15) being connected to the rear part (4).

6. The conductor according to claim 5, characterized in that The clamps (5, 6) are fixed in position on the support frame (15) by means of a fixed support frame (16).

7. The conductor according to claim 4, characterized in that The rear part (4) is part of a pre-assembled device connected to the holder (13).

8. The conductor according to claim 5, characterized in that The support frame (15) is glued to the rear part (4) and / or the support frame (15) is glued to the front part (3).

9. A device for electrical connection, comprising a housing with a frame (14), wherein a holder (13) is connected to the frame (14), at least one laminated busbar (2a, 2b) and a conductor (1) according to any of the preceding claims, wherein the rear part (4) is connected to the holder (13) and wherein the rear part (4) is movable relative to the holder (13).

Images