SU588584A1 - Overhead power transmission line - Google Patents

Description

and height and with different boom sag, smaller for a group of wires than the top.

In order to simplify the construction of the line and reduce the cost of the supports, the sections of the latter between the points of the fixed wires are made of conductive material, such as reinforced concrete.

FIG. 1 selected line, line view; in fig. 2 - line, when part of the insulating support is made of conductive material; in fig. 3 - lines, when nrovoda are insulated on the insulating support of the bushings of insulators.

Two groups of wires, top 1 and bottom 2, with different sag boom () are interconnected by metal cross-links 3 and attached to the insulating support 4 at different levels. The insulating support part 5, located between the fastenings of a group of wires to it, is made of a conductive material, such as metal, reinforced concrete, etc. {see FIG. 2). Groups of wires can be attached to the insulating support with the help of bush pd insulators 6 (see Fig. 3).

By increasing the distance between the wires of a single phase line, the equivalent splitting radius increases, which means the capacitance increases and the inductance decreases. Accordingly, the characteristic impedance of the line is reduced by the formula

1 / H

-Go

n increases natural power

I - 2

In addition, the small sag of the lower group of wires restricts the lateral deviation of the phase under the action of the wind load, and thus creates the possibility to bring the neighboring phases together.

Since both groups of wires are at the same potential, the portion of the insulating support between the points of attachment to it of groups of wires can be made of conductive material. This allows for a lighter construction and lower cost.

Fastening the bottom group of wires to the insulating support through additional insulation, for example, a wire of insulators, avoids the notice of its insulating part, which increases its discharge characteristics, or, with the same discharge characteristics, reduces its overall height.

The natural power of the proposed line with an allowable loss per corona increases 1.3-1.4 times and simultaneously decreases the distance between the phases of the line in the span from 22 to 16-18 m, i.e. it is possible to refuse the construction of additional chains and reduce 25% to 35% margin. For 1150 kV lines, this will amount to 1.2–1.4 ha per 1 km of line.

Claims (3)

1. An overhead transmission line containing insulating supports for each phase and fixed to them, for example through wires of insulators, split wires, characterized in that, in order to increase the natural power of the line, reduce its dimensions in width, and reduce the extent the influence of the line on the environment, each of its phases is made in the form of two groups of wires interconnected by transverse metal links and located at different heights and with different sag boom, smaller for the group of lower wires than for rhnih. 2. Line according to claim 1, characterized in that, in order to simplify its construction and reduce the cost of the supports, the sections of the supports between the fixing points of the wires are made of n-conducting material, for example reinforced concrete. Sources of information taken into account in the examination 1. Magidin FA, Berkovsky A., G. Design and installation of overhead power lines, ed. “Higher School, M., 1973. 2. USSR author's certificate No. 195617, cl. E 04C 3/32, published. 07.07.67 3. The author's certificate number 516136, cl. H 02G 7/00, 1974. Fig.}