WO2010018100A2

WO2010018100A2 - Method for producing a multipole connection or tap-off point for a busbar with coaxially arranged, tubular conductor elements

Info

Publication number: WO2010018100A2
Application number: PCT/EP2009/060047
Authority: WO
Inventors: Eckhard Ammann
Original assignee: Siemens Aktiengesellschaft
Priority date: 2008-08-13
Filing date: 2009-08-03
Publication date: 2010-02-18
Also published as: WO2010018100A3; DE102008037966A1

Abstract

The invention proposes a method for producing a multipole connection or tap-off point (7) for a busbar (1) with coaxially arranged, tubular conductor elements (2) and insulation layers situated between said conductor elements. The method comprises the following steps: in each case making a radially running blind hole (S) in the busbar (1), wherein the blind hole (S) has a predefinable minimum dimension (ID) which extends in the lateral direction and extends from a radial outer face (AS) of the busbar (1) to the conductor element (2) with which contact is to be made; inserting a connection pin (4) into the blind hole (S) and making electrical contact with the conductor element (2) while maintaining a minimum distance (MA); filling the remaining hollow spaces with a setting insulating material (5) and waiting for a setting time.

Description

description

Method for producing a multi-pole connection or exit point for a busbar with coaxially arranged, tubular sub-conductors

The invention relates to a method for the (subsequent) production of a multi-pole connection or exit point for a busbar with coaxially arranged, tubular sub-conductors and with insulating layers therebetween. Furthermore, the invention relates to a multi-pole connection or departure point for such a busbar and a busbar with at least one such connection or departure point.

In the German Offenlegungsschπft DT 1 803 363 electric medium voltage conductor with coaxially arranged, rohrformigen phase conductors are described with layers of insulation disposed therebetween. The medium-voltage conductors there are designed for high current loads of several 10 kA and voltage values of several 10 kV.

German Offenlegungsschrift DE 197 23 441 A1 discloses a coaxial busbar trunking system in which tubes or conductors are open lengthwise and are arranged between a spiral-shaped insulating foil. The conductors are arranged side by side in the production as flat films on a common insulating film, which is later rolled up together with the conductors spirally to form a tube. In a local embodiment (see Fig. 1) taps are provided for departure points in the manufacture of the busbar, that is in the unrolled state, transverse to the conductors, the taps have a strip shape and are insulated from the other conductors. Uninsulated are the taps only at the terminals. Subsequently, the conductors are rolled up together with the insulating film to the coaxial rail conductor. From the German Offenlegungsschπft DE 101 46 503 Al a housed in a housing electrical installation distribution is described. The latter has an access ladder inserted in the housing and outlet conductors leading to individual consumers, electrical installation devices and a support plate for holding the installation devices. The installation devices are, for example, fault current protection devices, line protection devices and the like, which can be connected to busbars connected to the access conductor and the outgoing conductors by means of a plug connection. The busbars are arranged below the support plate, and the support plate has openings into which the plug-in elements arranged on the installation devices can be introduced to the busbars. The busbars of different phases and inlets and outlets are in the same

Layers against each other and isolated from each other and embedded in a Isoliergehause, preferably cast.

The considered busbars are preferably provided for distributing and transporting currents with current values up to approximately 6300 A. They are intended in particular for AC voltages in the low voltage range up to 1000 V. Typically, such a bus bar on five konzen ^¬ trically arranged sub-conductors, wherein three of these tubes for three current phases, a tube for the neutral conductor and usually the outer tube for the protective earth are provided. The conductor pipes are usually made of metal, insbeson ^¬ particular of copper, made of aluminum or of a suitable copper or aluminum alloy. The intervening, coaxial insulating layers are usually made of an electrically insulating plastic.

Based on the above-mentioned prior art, it is an object of the invention to provide a method for particularly nachtraglichen production of a multi-pole point of connection or departure for a busbar with coaxially arranged, tubular sub-conductors and with insulating layers located therebetween. It is a further object of the invention to specify a multi-pole point of connection or departure for such a bus bar and a bus bar with at least one such terminal or departure point.

Erfmdungsgemaß the method comprises the following steps:

- Introducing a respective radially extending blind hole in the busbar, at least for the mnenliegenden Teillei ^¬ ter, wherein the respective blind hole has a transversely extending, predetermined minimum dimension and wherein the respective blind hole from a radial outer side of the busbar to the part to be contacted - ladder stretches,

Inserting a connecting bolt into the respective blind hole and making electrical contact with the respective sub-conductor while maintaining a longitudinal distance between the respective connecting bolt and a respective inner side of the blind hole which extends in the transverse direction,

- Completing the remaining between the respective terminal bolt and the respective blind holes cavities with a thermosetting insulating material and

- Waiting for a canning time.

The erfmdungsgemaße method allows easy production of a connection or departure point at any point of the busbar. In particular, the point of connection or departure can be subsequently produced. In comparison to the prior art, no special embodiments of the sub-conductors are required for this purpose. By filling the resulting coaxial cavities at the end of the manufacturing process, the requirements for compliance with clearances and creepage distances as well as the requirements for heat transfer and short-circuit resistance are fulfilled. If necessary, the respective tubular conductor can ^¬ minimum arranged distributed in the circumferential direction a, have axially extending Anschweißbereich or Anschweißsteg. In these areas, then the respective rohrformige

Subconductor on a thicker radial diameter. The "ver ^¬ thickened" areas preferably have a tangential width which is at least as large as the diameter of the connecting bolt to be contacted.

In order to allow a contacting of the inner conductor part, the radially from outside to inside successive conductor tubes are to be opened in the region of the connection or departure point. The blind holes to be introduced are preferably bores with a circular cross section. The number of required holes preferably corresponds to the number of internal conductor. The respective bore is to be introduced with a radial depth dimensioned in such a way that the surface of the part conductor to be contacted (straight) is reached or exposed. Preferably, the introduced blind holes or holes to be "blown out" by means of compressed air, if necessary to remove any remaining metal ^¬ metallic turnings.

Subsequently, the electrical contacting of the connecting pins preferably made of copper, of aluminum or of a suitable copper or aluminum alloy with the respective sub-conductor. Thereafter, the remaining to comply with the required clearance and creepage distances between the respective sub-conductors and the individual terminal bolts coaxial cavities are filled with a liquid, thermosetting insulation material. Em such insulating material may for example be a so-called epoxy resin. At the same time, the cured insulating material gives the inserted connecting pin an additional mechanical stability after curing. According to an advantageous embodiment, the contacting of the connecting bolts with the respective sub-conductor takes place by means of a rotary friction welding process. In this case, the connecting bolts are joined together with rotation and under application of a contact pressure with the respective sub-conductor to be contacted. The friction occurring during Tem ^¬ temperatures are relatively low, so that the existing in this area of insulation is not damaged. The electrical connection achieved in this way is extremely reliable, durable and comparatively low-tempered. It also allows the joining of two materials, such as copper with aluminum, which usually can not be welded together.

Alternatively, however, unfavorable in production terms, the contacting of the respective connecting bolt with the corresponding sub-conductor via a Lotung, via a Punktverschweißung, via a press fit or the like can be done.

According to a further advantageous process variant, the connecting bolts each have a pin dimensioned so long that all connection pins have a same direction away from the radial outer side of the busbar connection Long after contacting the jewei ^¬ celled conductor. As a result, uniform connection means for the respective connection bolts can be provided. The connecting bolts are before ^¬ preferably at a respective connection end, which is opposite to the con- taktierungsbereich, ER weitert in its cross section. The extension may have a circular, a square or a hexagonal cross-section. As a result, a particularly low-resistance contact, such as with a plug contact a drop box, possible. In addition, the respective outer terminal end may have an external thread, which corresponds to an internal thread of a connecting nut. According to a further embodiment, all blind holes are introduced axially aligned with each other in the busbar. "Axial" refers to directions parallel to the longitudinal axis or to the axis of rotation of the coaxial busbar, making it easier to create a connection or exit point, and it is also conceivable that several rows can be formed along the perimeter of the busbar, ie in the tangential direction Such connection or departure points can be arranged.

The object is further achieved by a multi-pole connection or departure point for a busbar with coaxially arranged, tubular sub-conductors and with insulating layers located therebetween. Erfmdungsgemaß the connection or departure point is prepared by such a (subsequent) method.

Finally, the object is achieved by a busbar with ko ^¬ axially arranged, rohrformigen sub-conductors and see with insulating layers lying therebetween, the busbar erfmdungsgemaß having at least one such connection or departure point. It can be present along the length of the busbar, a plurality of such connection ^¬ or outgoing points attached.

The invention and advantageous VERSIONS of the invention will be the near ^¬ written below on the basis of the following figures. Show it

1 shows a flowchart of the inventive method,

2 shows by way of example a perspective view of one end of a busbar with coaxially arranged partial conductors and with, by way of example, five terminal ^bolts , 3 shows an axial view of the busbar according to FIG. 2 with connection pins arranged axially aligned with one another, FIG.

4 shows a radial section through the series of

Connecting bolt and through the longitudinal axis of the current ^¬ rail according to the registered in FIG cutting line IV-IV and

5 shows an enlarged view of the bordered in FIG 4 ^¬ th, designated V area.

1 shows a flowchart of the inventive method. With Sl is a start step and S5 denotes a final step of the inventive method. In method step S2, the introduction of a radial connection blind hole takes place for each inner sub-conductor. In the subsequent step S3 contacting the jewei ^¬ then part conductor with a connection pin is performed. Subsequently, in step S4, the respective coaxial cavity between the connecting bolt and blind hole is filled with a thermosetting insulating material.

FIG. 2 shows a perspective illustration of one end of a busbar 1 with, by way of example, five connection bolts 4. In the example of the present FIG. 2, the busbar 1 comprises five coaxial tubular component conductors 2 made of metal, which are separated from one another by a tubular insulation layer 3. Instead of the illustrated circular cross-section of the sub-conductors 2 and of the insulating layers 3, other cross-sectional shapes can also be used, such as, for example, FIG. a rectangular, oval or square hollow profile.

The reference symbol A denotes a longitudinal axis of the busbar 1 shown. The current carrying capacity of each phase can be up to 6300 A and more. The busbar 1 shown is preferably in a low voltage rich, that is for voltages up to 1000 V, used. Alternatively, the busbar 1 can also be used for higher voltage, in particular in a medium voltage range up to 20 kV. In this case, higher voltage isolation requirements must be met.

The sub-conductors 2 are preferably made of aluminum or copper. The insulating layers 3 are typically made of a plastic polymer. Preferably, the wiring of the partial conductor tubes 2 takes place in such a way that the outer partial conductor tube 2 is connected to protective earth PE. Radially from outside to inside, the three network phases L1, L2, L3 follow. The very inner sub-conductor 2 is preferably connected to the neutral conductor N. The very inner subconductor tube 2, N has a cavity H, which can be used if necessary for the passage of a coolant.

With AS, the radial outer side of the busbar 1 is designated ^¬ net. The reference numeral 7 denotes a multi-pole connection or exit point for the bus bar 1 shown. It includes the exemplary five connection bolts 4 for the possible connection of outlet box for feeding or for removing a respective stream. The connecting bolts 4 are each inserted into a blind hole designated by the reference symbol S and, according to an advantageous embodiment, already have a uniform connection length AL. Reference numeral 5 designates an already hardened insulating material. It is preferably "pulled up" in the radial direction, such as by a few millimeters, to avoid the formation of creepage distances.

Alternatively or additionally, an insulating plastic sleeve can be inserted between the respective connection bolt 4 and the blind hole S. In the process, it acts as a displacement body, which allows the previously filled resin to rise from bottom to top. Air pockets are avoided. The connection pin 4 shown in the right part of FIG 2 is contacted directly with the outer, lying on protective earth potential PE conductor tube 2. An introduction of a blind hole or a bore S is not required in this case.

3 shows an axial view of the coaxial busbar 1 shown in FIG. 2. In this illustration, the aligned arrangement of the connecting pins 5 is shown particularly well.

4 shows a radial section through the multi-pole terminal or departure point 7 as well as through the longitudinal axis A of the conductor rail 1 along the section line IV-IV shown in FIG. As FIG 4 shows, the blind holes S and the holes are introduced with different depths in the busbar 1 to contact the respective sub-conductor 2. The connecting bolts 4 shown are inextricably contacted by means of a rotary friction welding process with the associated sub-conductor 2. Furthermore, the connection bolts 4 have a bolt length B1-B5 dimensioned in such a way that all connection bolts 4 have the same connection length AL.

FIG. 5 shows an enlarged view of the area framed in FIG. 4 and designated V. In this illustration, it can be seen how the local connection bolt 4 is introduced into the blind hole S shown, while maintaining a predetermined center distance MA. With ID, the inner diameter of the bore S and the blind hole and with AD the outer diameter of the cylindrical connecting bolt 4 is designated. Furthermore, a radial inside of the blind hole S is denoted by IS. By the reference numeral 5 of the cured insulation material for producing the insulation and for compliance with the air and creepage between the terminal pins 4 and the respective sub-conductors 2 is designated. K is the contact area. After application of the rotary friction welding process, the sub-conductor N, 2 and the Lock bolt 4 in this area K permanently welded together. D denotes the radial thickness of the subconductor tube N, 2. It is typically in a range of 2-5 mm.

While the invention has been illustrated and described in detail by the exemplary embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

In summary, a method for producing a multi-pole connection or departure point 7 for a conductor rail 1 with coaxially arranged, tubular sub-conductors 2 and intermediate insulating layers 5 is proposed. The method comprises the following steps: introducing in each case a radially running blind hole S into the conductor rail 1, the blind hole S having a transversely extending, predefinable minimum dimension ID and extending from a radial outer side AS of the busbar 1 to the conductor 2 to be contacted; Inserting a connecting bolt 4 in the blind hole S and making electrical contact with the conductor 2 while maintaining a minimum distance MA; Filling the remaining cavities with a thermosetting insulating material 5 and waiting for a Aushartezeit.

Claims

claims

1. A method for producing a multipolar connection or departure point (7) for a busbar (1) with coaxially arranged, tubular partial conductors (2) and with insulating layers (3) lying between them, characterized by the following steps:

- Introducing a respective radially extending blind hole (S) in the busbar (1), at least for the inner sub-conductor (2), wherein the respective blind hole (S) has a transversely extending, predetermined minimum dimension (ID) and wherein the respective blind hole (5) extends from a radial outer side (AS) of the busbar (1) to the part conductor (2) to be contacted, - insertion of a connecting bolt (4) in the respective blind hole (S) and electrical contact with the respective sub-conductor (2) in compliance with a transversely extending minimum distance (MA) between the respective connecting bolt (4) and a respective inner side (IS) of the blind hole (S),

- Filling the between the respective terminal bolt (4) and the respective blind holes (S) remaining cavities with a thermosetting insulating material (5) and

- Waiting for a canning time.

2. The manufacturing method according to claim 1, characterized in that the contacting of the connecting bolts (4) with the respective sub-conductor (2) takes place by means of a rotary friction welding process.

3. The manufacturing method according to claim 1 or 2, characterized in that the connecting bolts (4) each have a bolt length (B1-B5) sized in such a manner that all connecting bolts (4) follow

Contacting the respective sub-conductors (2) have a same, from the radial outer side (AS) of the busbar (1) pioneering connection length (AL).

4. The manufacturing method according to one of the preceding ^¬ claims, characterized in that all the blind holes (S) in axial alignment with each other in the busbar (1) are introduced.

5. Multi-pole point of connection or departure for a busbar (1) with coaxially arranged rohrformigen part conductors (2) and with insulating layers (5) lying between them, characterized in that the point of connection or departure produced by a manufacturing method according to one of the preceding claims is.

6. busbar with coaxially arranged, rohrformigen sub-conductors (2) and with insulating layers (5) lying therebetween, d a d u c c h e c e s in that the bus bar has at least one connection or exit point (7) according to claim 5.