RU2690700C1 - Phase-to-phase remote strut of overhead transmission lines - Google Patents

Abstract

FIELD: electric power engineering.SUBSTANCE: invention relates to electric power industry, in particular, to interphase remote struts of overhead transmission lines. Spacer comprises insulating module (1), two end-stoppers (2, 3) on its ends fixed to connecting attachment units (4, 5) to wires (ropes) (6). Structural length of spacer is selected less than distance between wires (ropes) (6) at installation point. Strut structure includes flexible element (7), rigidity of which is less than that of insulating module (1). Flexible element (7) is built in the middle of the insulating module.EFFECT: higher operational reliability.1 cl, 1 dwg

Description

The invention relates to the field of electric power industry, namely to interphase distance struts of overhead power lines.

A known interphase spacer for fixing the wires of an overhead transmission line, containing insulating traction with end fittings at its ends for fastening wires, is made of a composite of at least two elements interconnected, with the end fittings made with longitudinal channels on the inner surface of one the sides of which are made spikes, and the second side is made with a through hole with a bevel and an inclined protrusion [1].

This spacer is designed for installation on lines that are under voltage, which has led to a significant complication of the structural implementation of its insulating thrust with end fittings. Struts, mounted, as a rule, on non-live overhead power lines, are much simpler in design and the technological process of their manufacture is significantly less expensive and complicated.

An intraphase insulating strut is also known, comprising a housing connected to cone clamps for fastening the components of the split wire, each of which is provided with supporting and pressing dies; the body is made in the form of an axial rod of a dielectric material and has tracking protective ribs, and the die clips are rigidly fixed on the body, with the pressure and support dies connected by means of a bolt joint [2].

In this well-known strut, there is no optimal relationship between the values of the construction lengths of attachment points to overhead wires and the values of the building lengths of the insulating body, which is extremely important for achieving high electrical characteristics of the interphase distance struts, especially if they are mounted on superhigh-power and ultra-high voltage power lines (over 330 kV).

The closest technical solution in relation to the proposed is the interphase distance strut of overhead power lines, containing at least one insulation module with at least two end fittings made at its ends, fixed to the attachment points of attachment to wires and cables of overhead power lines [3].

In this technical solution, the interphase distance strut rigidly fixes wires or cables of overhead power lines in a predetermined position; leads to the destruction of the struts and to frequent accidents on overhead power lines due to this phenomenon.

The applicant set himself the specific task of developing an interphase distance strut of overhead power lines, characterized by high operational reliability, which is achieved by eliminating breakdowns of the spacer elements and its destruction as a whole when the wires (cables) vibrate, when due to the compressive forces that occur, rigidly fixed wires or cables tend to move towards each other, can just break the strut. The above positive technical result was achieved due to a new set of essential design features of the proposed interphase distance strut of overhead lines presented in the following claims: “interphase distance strut of overhead transmission lines containing at least one insulating module with at least two end fittings made at its ends, fixed to connecting attachment points to wires and cables of an overhead power line redacci; its construction length is chosen less than the distance between the wires and cables in the installation site, while it is equipped with an element whose stiffness is less than the stiffness of the insulation module; structural element with a lower stiffness than the stiffness of the insulation module, made in the form of a metal cable; at least one fitting and at least one connecting attachment unit to wires and cables of an overhead transmission line are structurally integrated; it is equipped with at least one device to regulate its building length. "

The invention is illustrated by drawings, where in FIG. 1 shows a general view of the interfacial spacer of overhead power lines made in accordance with the present invention.

The inventive interphase distance strut of overhead power lines contains an insulating module 1 (in the strut construction there can be more than one insulating module), two or more end fittings 2, 3 attached to the attachment fasteners 4, 5 to the wires (cables) 6 at its ends power lines. The insulating module of the spacer 1 is made of fiberglass, basalt-plastic or acid-resistant rods. The construction length of the spacer is chosen less than the distance between the wires (cables) 6 at the installation site. The structure of the spacer includes an element 7, the stiffness of which is less than the stiffness of the insulating module 1. The element 7 of the design of the spacer with a lower stiffness than the stiffness of the insulation module 1, is performed, for example, in the form of a metal cable. The end fittings 2, 3 and the mounting attachment points 4, 5 to the wires (cables) 6 of the overhead power line can be structurally combined (into a single structural unit). A device (not shown) can also be provided in the spacer, allowing adjustment of its building length.

The invention works as follows:

The proposed interphase distance strut, in which the stiffness of the insulation module 1 is greater than the rigidity of the element 7, for example, a metal cable section, does not work as a conventional interphase spacer, that is, simply fixes the wires (cables) of the overhead power line in the span, but acquires a new quality , acting as an effective flexible (elastic) device. When vibrations (vibrations), always taking place on overhead power lines, the wires (cables) tend to move, move towards each other, because with vibrations (vibrations) there are significant compressive forces acting on the wires (cables). In the course of these movements and movements of wires (cables), they act with great effort on the elements of known spacers (fittings, attachment fittings, insulating modules) and, as the spacer tends to keep the wires (cables) in their original (predetermined) position, they damage elements of the spacer, destroying it, as a rule, as a whole. In the claimed embodiment, when the wires (cables) 6 are compressed, the element 7 is bent due to its flexibility, allowing the insulation module 1 to bring the wires (cables) closer to each other, since the building strut length selected is less than the distance between the wires (cables) 6 installation site, makes it possible to do so. When the compressive forces cease to act, the element 7 due to elasticity expands, like a spring, and rigidly fixes the wires (cables) 6 of the overhead power line in a given (initial) position, without damaging the spacer elements, and without destroying whole

Thus, the proposed interphase distance strut of overhead power lines (called the “flexible” interphase distance strut) differs from the known technical solutions for a similar purpose by significantly increased operational reliability, since during long-term industrial use it is not damaged or destroyed due to vibrations (vibrations) of wires (cables) overhead power lines.

Information sources:

[one]. Description of the invention to the author's certificate "Interfacing distance strut for fixing the wires of an overhead transmission line" No. 1746453, H02G 7/12, declared 10/01/1990, published 07/07/1992.

[2]. The description of the utility model patent “Intraphase insulating strut” No. 136930, H02G 7/12, announced on July 17, 2013, published January 20, 2014.

[3]. Description to the patent for the invention "Interphase distance strut of overhead power lines with voltage of 35-1150 kV" No. 2577034, H02G 7/12, announced on 25.11.2014, published on 10.03.2016.

[four]. Description of the invention to the author's certificate "Interfacial strut" No. 1543492, H02G 7/12, declared 15.06.1987, published 15.02.1990.

[five]. Description of the invention to the author's certificate "Interfacial strut" №1220039, H02G 7/12, declared 06/21/1984, published 03/23/1986.

[6]. Description of the invention to the author's certificate "Interphase insulating strut" №1501206, H02G 7/12, declared 07.03.1984, published 08/15/1989.

[7]. Description of the invention to the author's certificate "High-voltage interphase spacer" №1443072, H02G 7/12, declared 09/01/1984, published 12/07/1988.

[eight]. Description of the invention to the author's certificate "Device for fastening the interphase spacer to the wires of the phases of an overhead transmission line" No. 1376165, H02G 7/12, declared 04/06/1986, published 02/23/1988.

Claims (1)

Interphase distance strut of overhead power lines, containing an insulating module with at least two end fittings made at its ends, fixed to connecting attachments to wires of an overhead power line, characterized in that it is provided with a flexible element made in the form of a metal cable, embedded in the middle of the insulation module and having a stiffness less than the stiffness of the insulation module itself, while the construction length of the spacer is chosen less than the distance The connection between the wires and cables in the place of their installation.

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