RU2340059C1 - Insulator overhunt three-phase set of air-lines of overhead transmission line - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: insulator overhunt three-phase set of overhead transmission line contains support rocker on which wires of overhead transmission line are hanged with overhead isolating assembly. Overhead isolating assembly is overhead insulator sets consistently and vertically interconnected and having suspended masses. Each overhead insulator set is connected with support through separate support insulator to fix specified overhead sets horizontally.

EFFECT: higher reliability of design and reduction of area width assigned for transmission line rocker.

3 dwg

Description

The invention relates to the field of construction of supporting structures of high voltage power lines. In particular, the invention relates to the design of a system for securing wires of three-phase overhead power lines (transmission lines).

In most types of three-phase overhead power lines, the wires 1 are fastened using free insulating hangers 2, each of which in turn is attached to a separate steel crossarm 3, mounted on a support column 4 (Fig. 1). Such solutions are described, for example, in SU No. 1573117, ЕНН 12/00, publ. 06/23/1990 or SU No. 545738, Е04Н 12/00, publ. 02/05/1977

With this method of fixing the wires, the minimum distance between the wires vertically is equal to the sum of two distances - the insulating air gap Nvozd.f. between the wire and the lower traverse and the construction height of the insulating phase suspension The indicated distance for each class of power line voltage has a specific value and cannot be reduced, because this will result in the air gap between the wire and the traverse overlapping in the event of an overvoltage. In addition, such a suspension can deviate from the vertical under the influence of wind pressure, which requires extending the yoke extension to provide an insulating distance between the wire and the support pole of the power transmission line, which increases the mass and cost of the traverse, and also increases the area alienated under the power transmission line and the width of the felling clearing in the case of transmission lines in the forests. The insulators in such a suspension take on both the wind and weight components of the load, which requires them to be subjected to significant mechanical loads, which, in turn, increases their cost.

At the same time, in some cases there is a need to minimize the distance between the wires of the neighboring phases of the power transmission line and between the wires and the support pole of the power transmission line. Such a need arises in the following and in a number of other cases:

- in compact power lines;

- in power lines with protected wires;

- in conditions when, for various reasons, power lines are carried out with small spans, and in connection with this there is a need to reduce interfacial distances, for example, in urban conditions;

- in conditions when, for various reasons, it is necessary to lower the height of the supports, for example, to increase the lightning resistance of power lines or to reduce the width of the security zone of power lines.

A known design of the rapprochement between the wires of power lines due to the use for fixing the wires of power lines of suspended 5 and supporting 6 insulators without the use of steel traverses (figure 2). In this case, the support insulator is fixed perpendicular to the pole of the power transmission line support, and the suspension insulator is fixed at a certain angle, the value of which is usually about 30 degrees. With this design of the suspension, it is possible to ensure a minimum distance between the wires of adjacent phases, equal to the insulating air gap Nvozd.l. between the phases of power lines withstanding linear overvoltages.

However, this design has a significant drawback, namely, that such a suspension design leads to increased loads compared to free suspension in suspension and support insulators arising from the combined action of the weight and wind components, which makes increased demands on the mechanical strength of all insulators that increases their cost.

There is also known the design of an insulating support-three-phase suspension of power lines, described in US No. 3316342, НВВ 17/00, Н01В 17/08, H02G 7/20, Н01В 17/00, Н01В 17/02, H02G 7/20, publ. 04/25/1967. The well-known three-phase suspension contains one steel traverse to which spaced electric wires of power lines are horizontally suspended on a suspension insulating suspension, while fixing the wires in the horizontal plane is carried out by a support insulator located obliquely to the horizontal direction.

This decision was made as a prototype for the claimed object.

The disadvantage of this design of the suspension of wires is that it does not provide for vertical spacing of wires. In a known construction, the line voltage wires are adjacent adjacent to one horizontal plane and are suspended from said vertical insulating suspension. And phase wires are suspended on a separate insulating suspension in another place at a distance from the line voltage wires and in their same plane of location. Thus, this design is developed in width and it has all the disadvantages that are noted in the previously described examples.

Similar solutions were used in DE No. 550405, SU No. 568288, US No. 7057103. The use of a vertical suspension insulating suspension for power transmission lines with fixing the wires in the horizontal plane by a support insulator, arranged obliquely or horizontally, in known examples leads to:

- either to increase the outreach of the traverse to ensure an insulating distance between the wire and the support pole of the power transmission line, which increases the mass and cost of the traverse, and also increases the area alienated under the power transmission line, and the width of the clearing in the case of transmission lines passing through the forests (US No. 3316342, SU No. 5666288);

- or to increased loads compared to free suspension in suspension and support insulators arising from the combined action of the weight and wind components, which places increased demands on the mechanical strength of all insulators, which also increases their cost (DE No. 550405, US No. 7057103) .

The present invention is aimed at solving the technical problem of changing the suspension circuit of wires by sequentially connecting them to each other on vertical suspension insulating suspensions, (the upper insulating suspension is designed for phase, and the middle and lower for linear voltage of the power lines), each of which is fixed horizontally located support insulator.

The technical result achieved in this case is to increase the reliability of the structure while reducing its mechanical strength and reducing the dimensions of the width of the area alienated under the transmission line.

The specified technical result is achieved by the fact that in the insulating support-suspended three-phase suspension of overhead power lines, containing the cross-arm of the support rack, to which the wires of the overhead power line are suspended on the suspension insulating structure and which is attached to the support rack through the support insulator, the suspension insulating structure is made in the form suspended in series with each other in the vertical direction of the suspension insulating suspensions, to which the phase wires are suspended, each I hanging suspension insulating support post is connected with a separate supporting insulator for securing said hanger in a horizontal direction.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The invention is illustrated by a specific example, which, however, is not the only possible, but clearly demonstrates the possibility of achieving the above set of features of the required technical result.

In Fig.1 is an example of securing wires according to the first analogue;

figure 2 is an example of fixing the wires on the second analogue;

figure 3 is an example of securing wires according to the invention.

According to the present invention, the construction of an insulating supporting-three-phase suspension of a power transmission line is considered (FIG. 3). The proposed suspension insulating structure contains one steel traverse 7 of the support pole of the power transmission line, to which the power transmission wires are vertically suspended on the suspension insulating pendants 8, 9, 10 connected in series with each other. In this case, the upper insulating suspension is designed for phase voltage, and the middle and lower - for the linear voltage of the power lines. Insulating pendants can be made with different mechanical strengths, as the upper suspension holds the weight of all three phases, the middle - the weight of two phases, and the lower weight of one phase. In order to fix the wires in a horizontal plane, horizontally placed support insulators 11 are used, connected with the support stand, on the one hand, and with insulating suspensions 8, 9, 10, on the other hand. Moreover, each individual support insulator 11 is connected with a separate insulating suspension. With such a suspension scheme, the entire weight load is perceived only by suspension insulating pendants, and the whole wind load is perceived only by support insulators 11. In the proposed suspension, the operation of both suspension and support insulators is significantly facilitated, which allows them to be made with lower mechanical strength, and, accordingly, reduce their cost.

The present invention is industrially applicable, as it is based on a rational arrangement of the support elements, which provides an increase in the operational characteristics of the support under working weight and wind loads.

The present invention allows to provide an insulating distance between the wire and the pole support of the power transmission line and the wires, to reduce the area alienated under the power transmission line, and the width of the clearing in the case of transmission lines in the forest, to reduce the mechanical strength of all insulators and, accordingly, the weight of the rack itself.

Claims (1)

An insulating support-suspended three-phase suspension of overhead power transmission lines, comprising the support of the support strut, to which wires of the overhead power transmission line are suspended on the suspension insulating structure, and which is attached to the support strut through the support insulator, characterized in that the suspension insulating structure is made in the form of series-connected to each other each other in a vertical direction of suspension insulating suspensions to which phase wires are suspended, with each suspension insulating suspension connected to the support column by a separate support insulator for fixing the said suspensions in the horizontal direction.

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