RU2571627C1 - Overhead power transmission line - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: overhead power transmission line comprises supports 1, on which by means of fixtures with insulators 2, there are wires 3 suspended along the vertical line on the supports. The lower wire is made as split into two wires - 4 and 5, which by means of rods with insulators 6 are fixed on cross beams 7, with coverage L of the above wires in the plan. In each span both wires 4 and 5 are connected galvanically to each other by at least one stiff electroconductive link 8, connected to the wires 4 and 5 by means of clamps 9. At the same time the total electric conductivity of both halves of the split lower wire (wires 4 and 5), and also electroconductivity of the link 8, are equal to the design electroconductivity of the lower non-split wire.

EFFECT: increased electric safety of an overhead power transmission line.

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Description

The invention relates to the field of electric power and can be used on overhead power lines with fastening wires on poles vertically.

Known overhead power line with fastening wires on poles vertically - see, for example, “Kligman MV Power supply for the construction of the Baikal-Amur Railway. - M .: "Transport", 1978. - 112 p., Ill., Tab. - Bibliography: p. 110. - (BAM - to help builders), p. 40, Fig. 16 a.

The disadvantage of this overhead power line design is that if the wires break, they fall to the ground, which can lead to electrical injuries, fires, etc. To prevent this, it is necessary to disconnect the line from the power source - if one or more wires break in the spans and fall to the ground. However, the line protection system may not notice the fact of such a fall, for example, with a line with an isolated neutral (in particular, with a high-voltage line), or when broken wires fall on snow, frozen ground, buildings, etc.

As a prototype, the design of an overhead power line was taken, in which the wires on the poles are mounted vertically (see Anastasiev P.I. and Frolov Yu.A. Power lines up to 10 kV of industrial enterprises. - M .: Energy, 1980. - 104 s. ., ill. - (Used electrician; Issue 504), p. 37, Fig. 24).

The disadvantages of the prototype are the same as that of the analogue.

The invention solves the problem of increasing electrical safety of an overhead power line.

For this, the overhead power line contains supports on which wires are mounted by means of fasteners with insulators, the lower wire being made split into two wires parallel to each other, located on both sides of the supports along the power line and secured by pins with insulators on the same horizontal cross beams with overlapping the plan of all the above wires; in each span, both halves of the split wire are galvanically connected to each other by at least one rigid conductive jumper oriented perpendicular to these halves; moreover, the total electrical conductivity of both halves of the split wire and the electrical conductivity of the jumper are equal to the calculated electrical conductivity of the lower wire of the unsplit.

The invention is illustrated in the drawing, which shows: overhead power line (General view) - Fig. 1, the same (top view) - FIG. 2.

The drawing shows: supports 1 overhead power lines; hooks with insulators 2; wires 3 mounted on hooks with insulators; split wire - wires 4 and 5; pins with insulators 6; traverses 7, jumper 8; clamps 9; the amount of overlap in the plan is L.

The overhead power line with a vertical arrangement of wires on the supports contains supports 1, on which, through fasteners (hooks) with insulators 2, wires 3 are mounted located above the lower wire. The bottom wire is made split into two parallel wires of equal cross-section 4 and 5, located on both sides of the supports along the length of the power line and fixed by pins with insulators 6 on the same horizontal traverse 7 with overlapping L in terms of all the upstream wires (3); in each span, both wires 4 and 5 are galvanically connected to each other by at least one rigid conductive jumper 8 using clamps 9 oriented perpendicular to these wires (4 and 5). The total electrical conductivity of both halves of the split lower wire (wires 4 and 5), as well as the electrical conductivity of jumper 8 are equal to the calculated electrical conductivity of the lower wire of the non-split.

When operating such a power line, in the event of a break in the wires located above the lower split wire (wires 4 and 5), they will inevitably fall on the jumper 8 connecting both of these wires (4 and 5), and a reliable short circuit between the wires of different phases, which will cause the system to disconnect the power line from the power source and prevent people and others from getting under voltage on the fallen dangling wire, prevent possible fires, etc.

Compared with the prototype, the proposed design of the overhead power line ensures reliable operation of the line protection - by creating a short circuit mode, which increases the electrical safety of the power line.

Claims (1)

An overhead power transmission line, preferably with vertical arrangement of wires on the supports, containing supports and wires mounted on them by means of fasteners with insulators, characterized in that the lower wire is split into two wires of equal cross section parallel to each other, located on both sides of the supports along the length power lines and supports fixed on the same horizontal horizontal traverses on both sides of the poles with overlapping in terms of all the upstream wires; in each span, both halves of the split lower wire are galvanically connected to each other by at least one rigid conductive jumper oriented perpendicular to these halves; moreover, the total electrical conductivity of both halves of the split wire and jumpers are equal to the calculated electrical conductivity of the lower wire of the unsplit.

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