DE1180016B - Metallic conductor for electrical overhead lines - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Kl .: HOIb

German Ki .: 21c -1/04

Number: 1180 016

File number: S 70438 VIII d / 21 c

Filing date: September 20, 1960

Lay-out day; October 22, 1964

The invention relates to a metallic conductor for overhead lines for the transmission of electrical Energy and relates to such a conductor with an inner, through a continuous steel wire spiral cavity formed with a lower slope.

One problem with overhead lines for very high voltage electrical energy is the limitation due to the corona effect in the ladders. In theory, this can solve this problem be that the conductors are formed so that the electrical gradient in the vicinity of the surface is decreased.

The easiest way to achieve this is if one does not want to use conductor bundles or can, in increasing the diameter of the conductor. However, this solution results in considerable economic Difficulties, as the cross-section and weight of the conductor also increase. In the case of lines for voltages below 220 kV, these difficulties can be overcome Aluminum-steel composite conductors are used, which have a larger cross-section with the same conductivity owns as a normal ladder. You can thereby achieve diameters at which the corona effect remains within reasonable limits without other, special measures.

However, when this principle is applied to overhead lines for voltages above 220 kV, the result is new difficulties. Attempts have already been made to address these difficulties in that Stretched diameter conductors are used in which some of the inner layers of wire are made up Aluminum have been replaced by impregnated paper threads or plastic threads. Such filling materials however, increase the cost of the conductor as well as the weight, which on the other hand again increases the Free span reduced or the ladder and masts have to be designed for higher tensile forces. The price of such overhead lines is therefore very high.

Another well-known attempt to overcome the difficulty is to get the ladder off to form an inner and an outer aluminum tube with round steel wires in between. However, such an electrical conductor is relatively rigid, so that it is only suitable for long overhead lines difficult to use. It has also been proposed in this known arrangement, the steel wires separated by interposed wires made of non-ferromagnetic metal such as aluminum. However, this arrangement improves the relatively metallic conductors for electrical overhead lines

Applicant:

Societa Edison and Acciaierie e Fernere

Lombarde Falck S. p. A., Milan (Italy)

Representative:

Dipl.-Ing. W. Meissner, Berlin 33,

and Dipl.-Ing. H. Tischer, Munich 2, Tal 71,

Patent attorneys

Claimed priority:

Italy September 25, 1959 (21666)

difficult to manufacture and does not reduce the rigidity of the conductor.

According to a further known embodiment, the conductor consists of an inner one Steel wire helix existing support structure, which is covered with further steel wires in the other direction

what is, and around which then the actual conductor wires made of aluminum. Particularly profiled wires must be used that have a result in very high weight and high costs, so that also in this known construction very strong masts have to be used to absorb the high tensile load, or else the free span must be reduced.

It is the object of the invention to provide a conductor for overhead lines for electrical To create energy of very high tension, which is extremely light, a sufficiently large one Has diameter in order to keep the corona effect within acceptable limits, and that as well has the high flexibility required for such an overhead conductor. According to the invention this is achieved in that on the inner steel wire spiral under a known intermediate layer at least one layer of alternately arranged circular steel and aluminum wires made of aluminum wires of circular cross-section and larger wire diameter than those alternating arranged steel and aluminum wires. This makes training very easy the necessary aluminum cross-section

is enough and the distribution of the current passage in cross section in one for the reduction of the Corona effect distributed in a favorable manner.

"'' ^Ί " 409 708/362

The invention is explained in more detail below with reference to the drawing using an exemplary embodiment. In the drawing shows

F i g. 1 shows a cross section through a conductor according to the invention and

F i g. 2 shows a longitudinal section along the line II-II in Fig. 1.

The waveguide shown has a continuous spiral made of steel wire 1, the outside of a first layer of steel wires 2 alternating with aluminum wires 3 of the same diameter is surrounded. On top of this first layer is a second layer of aluminum wires 4 with a larger diameter and then a third layer of aluminum wires 4 'with the same diameter as that Wires 4.

The steel wires 2 stranded together with the wires 3, 4, 4 ' made of aluminum and the steel spiral 1 form the supporting and supporting structure.

With such a composition you can create a conductor with an outside diameter of about 50 mm, with the two outer layers on average 54 aluminum wires with a diameter of 4.55 mm and the inner layer on average 24 wires with a diameter of 3.5 mm, and half of steel and half of aluminum. The wires 2 and 3 of the inner layer are around a spiral with 11 mm pitch and an inner diameter of about 20 mm made of steel wire from 2.5 mm in diameter.

The total cross-section of this conductor minus the spiral is 1108.4 mm ² , of which 993 mm ^{2 is} aluminum and 115.4 mm ^{2 is} steel, so that the ratio of aluminum to steel is about 10: 1. The total weight is about 3.94 kg / m and the tensile strength is about 28,900 kg.

Claims (1)

Claim: Metallic conductor for overhead lines for the transmission of electrical energy with a inner cavity formed less by a continuous steel wire spiral, thereby characterized in that on the steel wire spiral under a known intermediate layer of alternately arranged circular steel and aluminum wires of at least one layer Aluminum wire of circular cross-section and larger wire diameter than that alternately arranged steel and aluminum wires. Considered publications: German Patent Nos. 416 158, 449 049; Swiss patents No. 230 337,
111641, 119 569; French Patent Nos. 616 801, 615 490, 612; Austrian patent specifications No. 13 593,
257. 1 sheet of drawings 409 703/362 10.64 & Bundesdruckwoi Berlin