WO2013120691A1

WO2013120691A1 - Electrical energy feeding device having a cable feedthrough, a cable connection and a current rail

Info

Publication number: WO2013120691A1
Application number: PCT/EP2013/051764
Authority: WO
Inventors: Frank Bertels; Rainer Haar; Frank Alefelder
Original assignee: Siemens Aktiengesellschaft
Priority date: 2012-02-17
Filing date: 2013-01-30
Publication date: 2013-08-22
Also published as: CN103259230A; CN103259230B; DE102012202436A1

Abstract

An electrical energy feeding device (100) having a cable feedthrough (401), a cable connection (707) and a busbar (201) is disclosed.

Description

description

ELECTRICAL ENERGY INJECTION DEVICE WITH A CABLE TRANSMISSION, A CABLE CONNECTION AND A CIRCUIT

Electrical distribution systems can be designed as busbar systems. Busbar systems are used for the transport and distribution of electrical energy. Typical tasks of a busbar system are, for example, the connection of a transformer via a main distributor to the sub-distributor or the supply of large consumers. Busbar systems are also used to direct in wind turbines the power generated in the tower head of a generator to the tower base.

Typically, the busbars of a busbar system are housed in a rail box which prevents unwanted electrical contact between busbars and the environment from taking place. The rail box is dimensioned so that on the one hand the distances to prevent unwanted electrical contact are maintained, and on the other hand, the busbars are cooled within the rail box by natural and / or forced convection.

A cable feed for a busbar system has the task of either feed the current into the busbar system or to conduct the current out of the busbar system and distribute it to a cable connection. For example, cable feeds are used in wind turbines. In this case, the power is generated in a generator in the tower head of the wind turbine and fed via cables in the mounted on the tower wall busbar system. The Ka ^¬ beleinspeisung is thus a kind of adapter that connects the cable with the busbars.

For special customer applications, such as B. in wind turbines, adapted for space and cost reasons cable feeds are needed. It is for existing Kabelein Feeding in the interior of a tower of a wind energy plant the reduction of the outside dimensions is not arbitrarily possible; Dimensions can be adapted for example in conventional cable feeds only in radial alignment. Important here is that a certain internal volume must not be fallen below, since otherwise a cooling of the cable feed is not guaranteed.

It is an object of the invention to provide a cable feed for a busbar system available, which allows particularly advantageous and space-saving the electrical transition from cables to busbars.

The object is solved according to claim 1. The Kabeleinspei- solution for a current rail system comprises at least one electrical connection for a cable and at least one electrical connection for a current rail, wherein the min ^¬ least one electrical connection for a cable electrically connected to the at least one electrical connection for the

Power rail is connected.

It is advantageous here that current can be fed into such a cable ^¬ feed into a busbar system or the current of the busbar system can be discharged via such a cable feed.

In one embodiment of the invention, the cable feed comprises additional electrical connections for further ^cables , which are electrically connected to the at least one electrical connection for the busbar. The advantage here is that the current that is carried by the at least one busbar, can be distributed over several cables. As a result, the cables can be reduced in their cross-section and less expensive cables can be used.

In a further embodiment of the invention, the cable feed additionally comprises a housing on which the min. least one electrical connection for a cable and the min ^¬ least one electrical connection is made for a power rail at ^¬. In a further embodiment of the invention, the housing is substantially cuboidal and the at least one electrical connection for a cable and the at least one electrical connector for a conductor rail are attached to the same ^¬ side face of the cuboid housing.

In a further embodiment of the invention, the side surface of the housing to which the terminals are attached, formed as the smallest side surface in comparison to the other two side surfaces of the cuboid housing.

In a further embodiment of the invention, the side surface of the housing to which the terminals are attached, directed in the assembled state of the cable feed down. It is advantageous here that, for example moisture can not penetrate along the cable into the cable feed, since the connections for the cable in the mounted stand to ^¬ the cable feed are directed downwards. Especially in wind turbines, it is advantageous that Kondensflüs ^¬ sigkeit can not penetrate via the cable in the cable feed. Typically, in wind turbines cable feeds are used whose connections for the cables are directed upwards. Thus, the cable must be routed via a deflection roller ^¬ To the tower head. As a guide roller is not neces- dig in the inventive cable feed, when the side surface of the housing at which the connec ^¬ se are mounted, is directed in the mounted state of the Kabeleinspei ^¬ solution down. With the elimination of this pulley can be saved in addition to a platform within the tower ei ^¬ ner wind turbine, which is typically located in the cable feed.

In a further embodiment of the invention, the cable feed comprises at least a first electrical connection for a first busbar and at least a second electrical connection for a second busbar.

The electrical connections for a first busbar kön- NEN be formed in a first cross-sectional area, the electrical connections for a second bus bar in a second cross-sectional area, wherein the first Querschnittsflä ^¬ surface is different from the second cross-sectional area. The advantage here is that via the cable feed busbar systems with different cross-sectional areas can be supplied with power.

The electrical connections for the busbars may be formed by busbars protruding from the cable infeed. The advantage here is that about this from the

Cable feed-out busbars particularly simple an external busbar system can be connected to the cable feed, for example by means of a bolt connection.

In a further embodiment of the invention, the electrical connections for the cables are formed by passage through a housing side surface, through which the cables are guided into the interior of the housing, where they are electrically connected to the at least one electrical connection for the busbars. The feedthroughs through a housing side surface may be formed by cable grommets.

The invention will be described below with reference to the following figures.

Cable feed for a busbar system with a housing, and

Cable feed for a busbar system with at least one electrical connection for a cable and at least one electrical connection for a busbar. FIG. 1 shows a cable feed 100 for a busbar system. The cable feed 100 comprises electrical connections 401, 402, 403, 404; 411; 421 for each ^¬ Weils a cable and electrical connections 201, 202, 203, 204, 205, 206, 207; 301, 302, 303 for a respective current ^¬ rail. Inside the cable feed 100, the electrical connections for the cables are electrically connected to the electrical connections for the bus bars. Cable feed 100 comprises a housing 500 on which the electrical connections 401, 402, 403, 404; 411; 421 for a cable and the electrical connections 201, 202, 203, 204, 205, 206, 207; 301, 302, 303 are mounted for a busbar. The housing 500 is formed by the side surfaces 501, 502, 503 shown in FIG. According to the

Representation of Figure 1, the side surface 501 of the housing 500 is provided with ventilation slots. Likewise, ventilation slots can also be provided on the other side surfaces 502, 503.

The electrical connections for the cables and busbars are mounted on the side surface 502 of the housing 500 as shown in FIG. The side surface 502 is that ^{Seitenflä ¬} surface of the cuboid housing 500 with the smallest area compared to the other two side surfaces 501, 503th

As shown in Figure 1, the electrical connections for the cables 401, 402, 403, 404; 411; 421 and the electrical connections for the busbars 201, 202, 203, 204, 205, 206, 207; 301, 302, 303 on the same side surface

502 of the cuboid housing 500 attached. It is also conceivable that the electrical connections for the cables 401, 402, 403, 404; 411; 421 and the electrical connections for the busbars 201, 202, 203, 204, 205, 206, 207; 301, 302, 303 are mounted on oppositely disposed side surfaces of the cuboid housing 500. If the cable feed 100 according to the invention is mounted, for example, in a wind power plant, the side surface 502 with the connections points downwards in the mounted state. This means that the current rails which are guided in the interior of the tower of a wind turbine, can be electrically connected to the cable entry ^¬ supply 100 for example via a bolt connection. The cables passing through the electrical connections 401, 402, 403, 404; 411; 421 are guided, also show in their implementation down. This is particularly advantageous because, for example, moisture can not get along the cable into the interior of the cable feed 100. It is also advantageous for the cables that are connected to the cable feed 100 can be fed directly into the tower head of a wind turbine and not via a deflection device (for example, Umlenkrol ^¬ le) must be performed, as would be the case if the An ^¬ conclusions would be upwards.

In Figure 2, the cable feed 100 is shown, without the housing 500. In Figure 2, for example, the cable 921 is Darge ^¬ represents, which is ge ^¬ leads by an electrical connection 421. Cable 921 leads into the interior of the cable feed 100 and is there at the contact point 707 'electrically connected to the current ^¬ rail 207. Conductor rail 207, in turn, passes through the cable feed 100 and protrudes out of the cable feed 100 at its side surface 502. At the hook-shaped end of the busbar 207, an external busbar system, for example via a bolt connection, can be connected.

Cable feed 100 comprises a U-shaped bent support plate 592 with the rectangular leg 593 shown in Figure 2 on the support plate, the supports 561, 562, 563, 564, 565, 566 are attached. Cross members 551, 552, 553 serve to stabilize the housing 500. In addition, holders for the cables can be attached to the cross members. Beispielswei ^¬ se, the cable 921 through the bracket 591 on the cross member 551 held. The support plate 592 may also be formed in a different, expedient shape than the U-shaped.

For attachment of the housing 500, the struts are 581, 582. The housing 500 may by appropriate Aussparun ^¬ gene on the struts 581, 582 and be pushed by means of screw or riveted joints prevents the housing 500 disengages from the cable feed 100th The U-shaped bent support plate 592 includes brackets for the busbars 201, 202, 203, 204, 205, 206, 207; 301

302, 303. The bus bars comprise lateral extensions to which the contact points for the cables are attached. In ^¬ example, the busbar 303 includes an extension with the contact points 603, 603 ', 603''. Conductor rail 302 includes an extension with the contact points 602, 602 '. Conductor rail 207 includes an extension with the contact points 707, 707 ', 707''. Several contact points for cables can be attached to a busbar so that several cables with smaller cross-sectional areas can be attached to the busbars. This is less expensive than using a cable with a correspondingly larger cross-section. Also, the cables continue to allow some bending, which is not the case with cables with very large cross-sections.

The number of cables per busbar is freely selectable, in ^¬ example, two, three or four cables per Stromschie ^¬ ne be used and connected to this electrically.

The cable feed 100 may include electrical connections for more than one type of busbars. According to FIG. 2, the cable feed comprises first electrical connections for first busbars 202, 203, 204, 205, 206, 207 and second electrical connections for second busbars 301, 302,

303. The electrical connections for the first busbars are in a first cross-sectional area and the electrical connections for the second busbars in a second Cross-sectional area formed. The first cross-sectional area may differ from the second cross-sectional area. Likewise, the number of first and second busbars may differ from each other. According to Figure 2, the cable feed may comprise 100 examples game seven first current shift ^¬ nen and three second power rails.

In the electrical terminals 401, 402, 404; 411; The cables 421 may be passages through the housing side surface 502. These bushings make it possible to guide cable into the interior of the housing where they are driven elekt ^¬ connected to the electrical connections for the busbars. For example, in Figure 2, the cable 921 is shown, which is guided through the passage 421 into the interior of the housing 500 and there is electrically connected to the busbar 207 at the contact point 707 '. The feedthroughs can be designed as cable sleeves which enclose the cables in such a way that, for example, no dirt or moisture can reach the interior of the cable feed 100.

When using a cable feed 100 according to the invention in wind turbines, the axially elongated form of the feed is advantageous since there is little space available in the interior of a wind energy plant and therefore cable feeds must not be too bulky radially. The number of At ^¬ circuits for track determines the axial length of a cable connection unit 100. Thus, according to the invention an extension of the outer dimensions of the cable feed 100 is minimized in radialis ler direction and used the already known length of the bus bars as a connection space.

The cable connection unit 100 of the invention advantageously provides ^¬ enough, a space saving in radial direction by usage-of available space in the axial direction system. The cable feed 100 according to the invention simplifies the ^{sequence of connections} for systems with more than two rails or ^phases . In addition, because the side surface 502 of the cuboidal housing 500, on which the terminals are mounted, is directed downward, a platform or a ^¬ steering device for the cable can be saved.

Claims

claims

Cable feed (100) for a bus bar system, the cable feed (100) comprises at least one electrical connection (401, 402, 403, 404; 411; 421) for a cable and at least one electrical connection (201,

202, 203, 204, 205, 206, 207; 301, 302, comprising 303) for a current rail, wherein the at least one elekt ^¬ generic terminal (401, 402, 403, 404; 411; 421) for a cable electrically connected to the at least one electrical connector (201, 202, 203, 204 , 205, 206, 207, 301, 302, 303) for the bus bar.

Cable feed (100) according to claim 1, wherein the cable feed (100) additional electrical An ^¬ connections (401, 402, 403, 404; 411; 421) for further Ka ^¬ bel comprises electrically connected to the at least one electrical connection (201 , 202, 203, 204, 205, 206, 207, 301, 302, 303) for the bus bar.

Cable feed (100) according to claim 1 or 2, wherein the cable feed (100) additionally comprises a housing (500; 501, 502, 503) on which the at least one electrical connection (401, 402, 403, 404; 411; ) for a cable and the at least one electrical An ^¬ circuit (201, 202, 203, 204, 205, 206, 207, 301, 302, 303) is mounted for a busbar.

Cable feed (100) according to claim 3, wherein as the housing (500; 501, 502, 503) is substantially cuboidal and the at least one electrical An ^¬ circuit (401, 402, 403, 404; 411; 421) for a cable and the at least one electrical connection (201, 202,

203, 204, 205, 206, 207; 301, 302, 303) for a current rail ^¬ (on the same side surface 502) of the cuboid gene housing (500, 501, 502, 503) are mounted.

5. cable feed (100) according to claim 4, wherein the

Side surface (502) of the housing (500; 501, 502, 503), to which the connections are attached, as the smallest Be ^¬ tenfläche compared to the other two side surfaces (501, 503) of the cuboid housing (500; 501, 502, 503) is formed.

6. cable feed (100) according to claim 4 or 5, wherein the side surface (502) of the housing (500; 501, 502, 503) on which the terminals are mounted, in the mon ^¬ oriented state of the cable feed (100) down is directed.

7. Cable feed (100) according to one of the preceding claims, in which the cable feed (100) has at least one first electrical connection (201, 202, 203, 204, 205, 206, 207) for a first busbar and at least one second electrical connection (100). 301

302, 303) for a second bus bar.

8. cable feed (100) according to claim 7, wherein the electrical connections for a first bus bar in a first cross-sectional area and for a second

Busbar in a second cross-sectional area are ^{¬ out} forms, wherein the first cross-sectional area is under ^¬ different to the second cross-sectional area.

9. cable feed (100) according to one of the preceding claims, wherein the electrical connections (201, 202, 203, 204, 205, 206, 207; 301, 302, 303) for the current ^{¬ rails} of the cable feed (100) protruding busbars are formed.

10. Cable feed (100) according to one of claims 3 to 9, wherein the electrical connections (401, 402, 403, 404; 411; 421) for the cables of feedthroughs a housing side surfaces (502) are formed through which the cables are guided into the interior of the housing (500; 501, 502, 503) where they are electrically connected to the at least one electrical connection (201, 202, 203, 204, 205 , 206, 207, 301, 302, 303) for the bus bar.

The cable feed (100) of claim 10, wherein the feedthroughs are formed by a housing side surfaces (502) of cable grommets.