DE2162210A1 - PLASTIC INSULATED CONDUCTOR OF A POWERFUL CABLE - Google Patents

Description

Cable and metal works Gutehoffnungshütte Aktiengesellschaft

1 1170

December 13, 1971

Plastic-insulated conductor of a power cable

The present invention relates to a plastic-insulated one in particular multi-stranded condensed conductor of an electrical power cable, preferably the neutral conductor a low voltage cable.

For plastic-sheathed low-voltage cables with plastic-insulated Ladders are often referred to as multi-wire, Executed compact aluminum ladder, which can be designed either as a customer leader or as a sector leader can. With such cables, damage to the outer sheath can go undetected for a long time if it does not short-circuit at the moment of damage. In contrast to paper-insulated cables is namely the plastic insulation is not sensitive to moisture, so that even a conductor exposed when damaged does not have to lead to failure of the cable.

As long as the conductors of the damaged cable are made of copper, the cable system is not endangered. An exposed aluminum conductor corrodes however, over time, until it comes to a ladder interrupted. If the conductor is a phase conductor, then

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if the current path is interrupted, the error is "noticeable" through a power failure the corroded conductor around the ladder, the interruption is initially not noticed. Only when the Neutral or protective conductor is required, e.g. in the event of a shock to the body of a connected device, the interruption is detected. But it can often be too late by then, because the protective conductor is now can no longer fulfill its intended function. The system no longer switches off, so people who come into contact with the endangered system, are endangered.

One already has (DAS 1 252 77 ^ t) signs of corrosion on multi-wire aluminum conductors of electrical low-voltage cables thereby trying to avoid that the existing aluminum wires of the conductor are attached their surface within the surrounding plastic insulation has been impregnated with a corrosion-inhibiting, adhesive, waxy mass that is not susceptible to cracking. Apart from the fact that the application of this mass is an additional operation in the course of the cable production means, this mass is sufficient, in particular because of the constant risk of abrasion, for example in cable production, not always the demands placed on them.

The invention eliminates these difficulties with plastic overcome the insulated conductors of a power cable. According to the invention, the conductor or the individual wires exist The conductor consists of an aluminum core and a metallurgical bond with the aluminum core Sheath made of a metal with increased corrosion resistance.

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The sheathing encloses the core of the conductor or the core of the wires of the conductor individually and thus prevents at the same time An overlapping of local corrosion phenomena, especially with multi-wire conductors on individual conductors Wires on adjacent wires. The production of such cables can be carried out on the existing production facilities can be carried out without difficulty, the cable structure over the aluminum conductor with e.g. a copper sheath corresponds to the usual cables, so the cable according to the invention fully meets the requirements. Furthermore can use the ■ commercially available terminals and connectors be used, so that no assembly difficulties occur. Such a so-called copper-clad The aluminum ladder, regardless of whether it is a round or sector ladder, will remain in the event of damage the insulating sleeve behave like a full copper conductor in the ground, i.e. the cable system and the connected System parts remain safe even if the cable is damaged.

When carrying out the invention, it is advantageous, for example, as a material of increased corrosion resistance Use copper that is in the form of a longitudinal Metal strip of thin wall thickness, which is formed into a tube and welded at the edges, which surrounds Αΐηηιχηχμηιβββίβ and by special processing operations such as pulling down and, if necessary, a subsequent or intermediate Heat treatment leads to a metallurgical bond with the aluminum core.

The invention is based on the multi-wire designs shown in FIGS. 1 to 3 as exemplary embodiments explained in more detail.

BATH ORIGINAL

1 shows a low-voltage cable, the four sector conductors 1 to 4 of which are made from compacted conductors which, as can be seen in particular from FIG and copper tape with a thin wall thickness welded to the edges. The four sector conductors 1 to 4 designed in this way, which are each surrounded by a plastic sheath 5i, 6, 7 and 8, are then enclosed on the outside by the plastic jacket 9. Below the plastic jacket 9 there is a tape wrapping 10 which is used to hold the individual sector conductors together. The interstices between the sector conductors can, as indicated, be filled with filling threads 11 and 12. Instead of the dandy winding 10 and the filling threads 12, a pressed layer, for example a rubber-containing mixture, can also be applied.

In contrast to the exemplary embodiment according to FIG. 1, a low-voltage cable is described in FIG. 3, the individual conductors IJ, 14, 15 and 16 of which are designed as round conductors. As can be seen from the figure, these round conductors consist of individual conductors 25 compacted with one another, which are designed according to FIG. The individual round conductors 13 to 16 are surrounded by insulating sleeves 17, lo, 19 and 20, for example made of a suitable plastic, and are all housed together in a common inner jacket 21. Diesel "inner jacket or the subsequently applied outer jacket 22 can be

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may be made of a plastic based on polyvinyl chloride, it is sometimes advantageous to provide a reinforcement 23 in the usual way between the inner jacket 21 and the outer jacket 22.

With regard to the safety of the system, it is also sufficient if only one of the four conductors, namely the protective conductor, is carried out in the manner described, while the remaining conductors are made of pure aluminum.

If massive conductors are used, then these can also- ^

if designed as a round conductor or as a sector conductor

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Claims (3)

Kabel- und Metallwerke Gutehoffnungshütte Aktiengesellschaft 1 1170 December 13; .I97I Patent Claims 1.] Plastic-insulated, in particular multi-stranded condensed conductor of an electrical power cable, preferably a neutral conductor of a low-voltage cable, characterized in that the conductor or the
Individual wires of the conductor made from an aluminum core
and a casing made of a metal of increased corrosion resistance, which is in a metallurgical bond with the aluminum core. 2. Plastic-insulated conductor according to claim 1, characterized characterized in that copper is used as the material of increased corrosion resistance. 3. Plastic-insulated conductor according to claim 1 or 2, characterized in that the casing consisting of a material of increased corrosion resistance made of a metal strip of thin wall thickness that runs lengthways, is shaped into a tube and welded at the edges consists. 309326/0460