Electrical connection with cover

Abstract

Electrical connection comprising at least one cable (510; 511) or at least one second busbar (550) and a first busbar (600; 610) with at least one connection point (700) for the at least one cable (510; 511) or for the at least one second busbar (550), wherein the at least one cable (510; 511) or the at least one second busbar (550) is electrically conductively connected to the first busbar (600; 610) via the connection point (700), characterized by a cover (100) comprising electrically insulating fabric (210) which is cut rectangularly and which is provided with holding means (310; 320) on at least two opposite edges (211; 212), wherein the electrically insulating fabric (210) is designed such that, when the cover (100) is mounted, the electrical connection is completely surrounded by the electrically insulating fabric (210). is that when the cover (100) is mounted, the holding means (310;320) hold the electrically insulating fabric (210) around the electrical connection, and that when the cover (100) is mounted, the electrically insulating fabric (210) can be completely removed from the electrical connection by releasing the holding means (310; 320), wherein the part of the at least one cable (510; 511) or of the at least one second busbar (550) at the connection point (700) and additionally the connection point (700) are completely surrounded by the cover (100);

Description

[0001] The invention relates to an electrical connection with a cover.

[0002] Electrical connectors are used in a wide variety of electrical devices. For example, electrical connectors are attached to switchboards to provide electrical feeds. Such switchboard elements, also called FCB panels (feeder circuit breakers), are supplied with power externally via electrical connectors.

[0003] Arc fault detection systems are used to detect faults in electrical control cabinets. These typically consist of light sensors installed in the equipment that optically detect arcs that occur there, as well as transformers in the power supply. The transformers in the power supply can detect an atypical current surge. The detection system evaluates the signals from the light sensors and the transformers and decides whether a circuit breaker in the control cabinet should disconnect it from the power supply. Arc fault detection systems ensure that an arc can burn for a maximum of 50 ms. This relatively short time minimizes the damage that such an arc can cause in a control cabinet.

[0004] When an arc fault is detected and the detection system is triggered, all components downstream of the power supply are shut down. Upstream components cannot be shut down by the detection system and could continue to contribute to the destruction of the system or endanger people.

[0005] Upstream components are typically electrically insulated. Typical upstream components of a feeder include cables or busbars. These cables or busbars are electrically insulated from the environment using insulation or insulating tape. Self-adhesive insulating tape is typically used for this purpose. Cables or busbars are typically connected to a feeder and screwed to the busbars of the feeder. This requires uninsulated sections of the busbar and cables to establish electrical contact between the cable or busbar and the busbar of the feeder.

[0006] To install the cable or busbar to a feeder, certain parts of the feeder busbar and the cable or busbar must be uninsulated. The installer screws the cable or busbar to the feeder busbar. The connection itself can also be insulated, for example, with self-adhesive insulating tape. This bonding would have to be done at the installation site and is usually not reliable. Furthermore, bonded insulation cannot simply be removed from the electrical connection without leaving residue. Furthermore, self-adhesive insulating tape cannot be reused.

[0007] For the purpose of electrically insulating exposed conductors, covers are known at least from DE 200 20 440 U1, DE 103 24 342 A1, DE 100 05 912 A1 and DE 21 31 961 A.

[0008] It is therefore an object of the invention to provide an electrical connection with a cover that can be easily attached at the installation site and can also be easily removed and reused.

[0009] The object is also achieved by an electrical connection according to claim 1. The electrical connection comprises at least one cable or at least one second busbar, a first busbar with at least one connection point for the at least one cable or for the at least one second busbar, and a cover according to one of the preceding claims, wherein the at least one cable or the at least one second busbar is electrically conductively connected to the busbar via the connection point, and wherein the part of the at least one cable or the at least one second busbar at the connection point is completely surrounded by the cover. The connection point of the electrical connection is completely surrounded by the cover.

[0010] The cover for the electrical connection comprises electrically insulating fabric which is cut rectangularly and which is provided with holding means on at least two opposite edges, wherein the electrically insulating fabric is designed such that, when the cover is fitted, the electrical connection is completely surrounded by the electrically insulating fabric, that, when the cover is fitted, the holding means hold the electrically insulating fabric around the electrical connection, and that, when the cover is fitted, the electrically insulating fabric can be completely removed from the electrical connection by releasing the holding means.

[0011] The advantage here is that the electrically insulating fabric can be cut to size for an electrical connection and is then easy to install. The cover encloses the electrical connection and prevents arcing faults from occurring and endangering people in the vicinity of the electrical connection. The cover is held particularly easily to the electrical connection using retaining devices. The mechanical fastening and locking of the cover allow for easy removal and recycling. The easy removal and reuse of the cover is advantageous when inspecting the electrical connection.

[0012] The electrically insulating fabric can have holes on at least two opposite edges. The retaining means can be connected to the electrically insulating fabric via the holes. Cable ties can be used as the retaining means. The advantage here is that cable ties are typically available in large numbers at the switchgear assembly site, and installing the cover using the cable ties is particularly easy for a technician.

[0013] When the cover is installed, the electrically insulating fabric can at least partially form a cylindrical arrangement. The cylindrical arrangement can be arranged between the opposite edges with the retaining means.

[0014] Two cables or two second busbars can be attached to a connection point of the first busbar.

[0015] The electrical connection may comprise an additional electrically insulating fabric which is cut rectangularly, which is partially attached to the busbar, and which, when the cover is mounted, covers the at least one connection point and is held by at least one holding means of the cover.

[0016] The advantage here is that the additional electrically insulating fabric can be pre-assembled on the busbar and can be used to insulate the electrical connection after mounting the at least one cable or the second busbar at the connection point of the first busbar.

[0017] The invention is described below with reference to the following figures. Fig. 1A and Fig. 1B electrically insulating fabric and additional electrically insulating fabric, Fig. 2 electrical connection with cover before final assembly, Fig. 3A, Fig. 3B, Fig. 3C Switch with first busbars before mounting the cables, after mounting the cables and after mounting the covers, Fig. 4A and Fig. 4B Busbars with cables and covers and additional electrically insulating fabrics, Fig. 5 mounted covers for an electrical connection with mounted additional electrically insulating fabric, and Fig. 6A and Fig. 6B Switch with first busbars after mounting the second busbars and after mounting the covers.

[0018] In Fig. 1A shows electrically insulating fabric 210. The electrically insulating fabric 210 is cut rectangular. On at least two opposite edges 211, 212, the electrically insulating fabric 210 can be provided with holding means 310, 320, which are Fig. 1A are not shown. The electrically insulating fabric 210 has holes on at least two opposite edges 211, 212. Holes 251, 252, 253, 254, 255, 256 are provided on edge 211. Holes 261, 262, 263, 264, 265, 266 are provided on edge 212.

[0019] In Fig. 2 shows an electrical connection with a cover 100. The cover 100 comprises the electrically insulating fabric 210, which is provided with holding means 310, 320 on at least two opposite edges 211, 212. The holding means 310, 320 can be designed, for example, as cable ties or equivalent fastening elements. The electrical connection consists of a first busbar 600 and a connection point 700 on the first busbar 600. A cable 510 can be attached to the connection point 700. It is also possible to attach multiple cables 510, 511 to one connection point 700. In order for the cables 510, 511 to have electrical contact with the first busbar 600, the end of the first busbar 600 must be bare or uninsulated, as must the ends of the cables 510, 511. These uninsulated areas are surrounded by the cover 100 so that the electrical connection is electrically insulated from its surroundings.

[0020] In the Fig. 3A, Fig. 3B and Fig. Figure 3C shows step by step how the electrical connection is provided with the cover 100.

[0021] Fig. 3A shows a switch 1000 in a control cabinet, which represents, for example, a power supply. The switch 1000 is provided with external electrical connections implemented via first busbars 600. The first busbar 600 extending from the switch 1000 in the control cabinet is provided at one end with a connection point 700, to which, for example, cables 510, 511 can be attached. Near connection point 700, the first busbar 600 is not insulated, allowing electrical contact with the cables 510, 511.

[0022] In Fig. 3B shows the switch 1000 with the first busbar 600, wherein cables 510, 511 are mounted on the first busbar 600 or at the connection point 700 of the first busbar 600. For example, the cables 510, 511 can be fastened to the first busbar 600 by means of a screw. Cables 510, 511 are also not insulated in the area of ​​the connection point 700, so that electrical contact between cables 510, 511 and the first busbar 600 is possible. Cables 510, 511 can terminate in cable connectors provided with an eyelet for screwing to the connection point 700.

[0023] In Fig. 3C, the covers 100 are mounted around the non-insulated parts of the electrical connection. The covers 100 are positioned according to the Fig. 2 is placed around the electrical connection to be insulated, and the cable ties 310, 320 are tightened. The covers 100 are designed such that the electrically insulating fabric 210 completely surrounds the electrical connection. The holding means 310, 320 hold the electrically insulating fabric 210 around the electrical connection. The installed cover 100 can be easily detached from the electrical connection by releasing the holding means 310, 320 and can thus be completely removed from the electrical connection.

[0024] The covers 100 can be configured such that, when the cover 100 is mounted, the electrically insulating fabric 210 has at least a partially cylindrical configuration. This cylindrical configuration typically lies between the opposite edges 211, 212 of the holding means 310, 320.

[0025] In Fig. 4A shows electrical connections formed by first busbars 600, 610, wherein a plurality of connection points 700 are attached to a first busbar 600, 610. Typically, such an arrangement with a plurality of connection points on a first busbar is used when, for example, currents exceeding 3000 A must be fed in via a feeder. Since the connection points 700 are located on a carrier, it is not possible in such a configuration to also use the cover 100 to insulate the connection points 700. In such a case, an additional electrically insulating fabric 220 is provided. Fig. 4A, the opposing connection points of the first busbars 600 and 610 can be provided with the additional electrically insulating fabric 220 particularly advantageously if the first busbars 600 and 610 belong to different phases.

[0026] In Fig. 4B, the additional electrically insulating fabric 220 is shown. A portion of the additional electrically insulating fabric 220 is attached to the first busbar 600. Optimally, the additional electrically insulating fabric 220 is attached in an area above the connection points 700. After mounting the cables 510, 511 at the connection points 700, the additional electrically insulating fabric 220 can be folded over the screw connection at the connection points 700. The additional electrically insulating fabric 220 can be cut with scissors or another means in the areas between the connection points 700. Thereafter, the covers 100 are mounted around the electrical connections as shown in the Fig. 3C or Fig. 2. When the cover 100 is mounted, the additional electrically insulating fabric 220 is held by at least one holding means of the cover 100.

[0027] The additional electrically insulating fabric 220 is also in Fig. 1B. The additional electrically insulating fabric 220 typically has a rectangular shape. The additional electrically insulating fabric 220 is typically made of the same material as the electrically insulating fabric 210 of the covers 100.

[0028] Instead of the cables 510, 511, a second busbar 550 or second busbars 550, 551 can also be attached to the first busbar 600. This is described in more detail in the Fig. 6A and Fig. 6B.

[0029] Fig. 6A shows the switch 1000 with the first busbar 600, with a second busbar 550 mounted on the first busbar 600 or at the connection point 700 of the first busbar 600. For example, the second busbar 550 can be attached to the first busbar 600 by means of a screw. The second busbar 550 is also not insulated in the area of ​​the connection point 700, so that electrical contact between the second busbar 550 and the first busbar 600 is possible.

[0030] In Fig. 6B, the covers 100 are mounted around the non-insulated parts of the electrical connection. The covers 100 are positioned according to the Fig.2 is placed around the electrical connection to be insulated, and the cable ties 310, 320 are tightened. The covers 100 are designed such that the electrically insulating fabric 210 completely surrounds the electrical connection. The holding means 310, 320 hold the electrically insulating fabric 210 around the electrical connection. The installed cover 100 can be easily detached from the electrical connection by releasing the holding means 310, 320 and can thus be completely removed from the electrical connection.

[0031] The electrically insulating fabric 210 of the cover 100 and the additional electrically insulating fabric 220 can be formed from a multi-layer sandwich structure. A glass fiber reinforced layer can be considered as the carrier layer of the fabric. This has the advantage that glass fiber exhibits high mechanical stability and can also be electrically insulating. This makes the fabric easy to handle and process.

[0032] Additional insulation layers can be applied above or below the carrier layer. These additional layers can be colored in such a way that a mechanical penetration of these layers by an installer is visually detectable.

[0033] The electrically insulating fabric 210 of the cover 100 as well as the additional electrically insulating fabric 220 should be thermally resistant, since in the connection area of ​​switch cabinets - such as in feed-ins - the busbars can have temperatures of around 100°C.

Claims

[1] Electrical connection comprising at least one cable (510; 511) or at least one second busbar (550) and a first busbar (600; 610) with at least one connection point (700) for the at least one cable (510; 511) or for the at least one second busbar (550), wherein the at least one cable (510; 511) or the at least one second busbar (550) is electrically conductively connected to the first busbar (600; 610) via the connection point (700), characterized bya cover (100) comprising electrically insulating fabric (210) which is cut rectangularly and which is provided with holding means (310; 320) on at least two opposite edges (211; 212), wherein the electrically insulating fabric (210) is designed such that, when the cover (100) is mounted, the electrical connection is completely surrounded by the electrically insulating fabric (210), that, when the cover (100) is mounted, the holding means (310; 320) hold the electrically insulating fabric (210) around the electrical connection, and that, when the cover (100) is mounted, the electrically insulating fabric (210) is completely removable from the electrical connection by releasing the holding means (310; 320), wherein the part of the at least one cable (510; 511) or of the at least one second busbar (550) at the connection point (700) and additionally the connection point (700) are completely removed from the cover (100) are surrounded. [2] Electrical connection according to claim 1, wherein two cables (510; 511) or two second busbars (550) are attached to a connection point (700) of the first busbar (600; 610). [3] Electrical connection according to one of the preceding claims, wherein the electrical connection additionally comprises an electrically insulating fabric (220) which is cut rectangular, which is partially attached to the first busbar (600; 610) and which, when the cover (100) is mounted, covers the at least one connection point (700) and is held by at least one holding means (310; 320) of the cover (100). [4] Electrical connection according to one of the preceding claims, wherein the electrically insulating fabric (210) has holes (251, 252, 253, 254, 255, 256; 261, 262, 263, 264, 265, 266) on the at least two opposite edges (211; 212). [5] Electrical connection according to claim 4, wherein the holding means (310; 320) are connected to the electrically insulating fabric (210) via the holes (251, 252, 253, 254, 255, 256; 261, 262, 263, 264, 265, 266). [6] Electrical connection according to one of the preceding claims, wherein the holding means (310; 320) are designed as cable ties. [7] Electrical connection according to one of the preceding claims, wherein when the cover (100) is mounted, the electrically insulating fabric (210) has at least partially a cylindrical arrangement. [8] Electrical terminal according to claim 7, wherein the cylindrical arrangement is arranged between the opposite edges (211; 212) with the holding means (310; 320).

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