RU2763034C1 - Device for damping wind vibration of wires, tows, cables - Google Patents

Abstract

FIELD: power industry.SUBSTANCE: invention relates to electric power industry for damping wind vibration of wires, tows, cables of overhead power lines and communications. The device contains an elastic strand of wire spirals (17) in the form of a loop and clips (18, 19) for installing the elastic strand of wire spirals on a wire (20), tow, cable or on a linear clamp. According to the invention, distributed elements (24) and/or concentrated elements are placed on the elastic strand along its length to weigh down and/or change the stiffness of the elastic strand.EFFECT: increase in the resistance of overhead power transmission and communication lines to low-frequency vibration, especially in long spans.3 cl, 6 dwg

Description

The invention relates to the field of power engineering, in particular to devices for damping wind vibration of wires, cables, cables of overhead power transmission lines and communications.

Known damper dance wires overhead power line, containing a load and an attachment point, through which the load is attached to the wire [1].

This damper is made using standard linear reinforcement, which, in contrast to spiral linear reinforcement, is characterized by a negative moment associated with the difference in stiffness at the points of contact between the reinforcement and the wire, which leads to damage and destruction of the wire in the places of its suspension.

The closest technical solution in relation to the proposed one is a device for damping wind vibration of wires, cables, cables of overhead power lines and communication, containing an elastic strand of wire spirals [2].

Nevertheless, experiments carried out on a vibration stand showed that the damping and dynamic characteristics of such a device (absorber) in the frequency range from 3 to 15 Hz were insufficient to protect wires, (lightning protection) cables and (self-supporting non-metallic optical) communication cables of overhead lines power transmission and communication.

The applicant set himself the task of developing a device (absorber) for damping wind vibration of wires, (lightning protection) cables and (self-supporting non-metallic optical) communication cables of overhead power transmission lines and communication in the vibration frequency range from 3 to 15 Hz, characterized by high damping characteristics in a given frequency range, increasing its reliability and durability. The above positive technical result was achieved due to a new set of design features of a device for damping wind vibration of wires, cables, cables, made according to the present invention and presented in the following claims: a device for damping wind vibration of wires, cables, cables, containing an elastic strand of wire spirals ; an elastic strand of wire spirals in the form of a loop is mounted on a wire, cable, cable or on a linear clamp using at least two clamps, while on the elastic strand of wire spirals there are distributed elements and / or lumped elements located along its length, intended for weighting and / or changing the stiffness of an elastic strand; the above-mentioned distributed elements are made in the form of at least one single-layer or multi-layer set of additional wire spirals wound on an elastic strand; the aforementioned lumped elements are made in the form of weights fixed on an elastic strand of wire spirals with the help of additional nodes and distributed along its length. "

The essence of the invention is illustrated by drawings, where FIG. 1 schematically shows a device for damping wind vibration of wires, cables, cables, made according to the present invention, a variant with an elastic strand of wire spirals in the form of a single loop and two clamps; in fig. 2 schematically shows a device for damping wind vibration of wires, cables, cables, made according to the present invention, a variant with three looped elastic strand of wire spirals and four clamps; in fig. 3 schematically shows a device for damping wind vibration of wires, cables, cables, made according to the present invention, a variant with an elastic strand of wire spirals in the form of a single loop, with two clamps and one distributed element; in fig. 4 schematically shows a device for damping wind vibration of wires, cables, cables, made according to the present invention, a variant with an elastic strand of wire spirals in the form of a single loop, with two clamps and two lumped elements; in fig. 5 schematically shows a device for damping wind vibration of wires, cables, cables, made according to the present invention, a variant with an elastic strand of wire spirals in the form of a single loop, with two spiral clamps; in fig. 6 - graphs of the dependence of the vibration amplitude of the steel-aluminum wire at a point at a distance of 89 mm from the point of exit from the supporting clamp, depending on the frequency (row 1 - steel-aluminum wire with a loop vibration damper; row 2 - steel-aluminum wire; row 3 - permissible amplitude value; row 4 - steel-aluminum wire with Stockbridge resonant vibration damper).

The inventive device for damping wind vibration of wires, cables, cables contains an elastic strand of wire spirals and clamps for installing an elastic strand of wire spirals on a wire, cable, cable or on a linear clamp, while distributed elements and / or lumped elements are located on the elastic strand of wire spirals located along its length, designed to make it heavier and / or change the rigidity of the elastic strand.

FIG. 1 shows a variant of the device with an elastic strand 1 of wire spirals, in the form of a single loop, with two bolt clamps 2, 3, with the help of which the strand 1 is installed on a wire (cable, cable) 4 through a protective spiral protector 5 and with a supporting clip 6 for suspension overhead power line or communication devices through protective spiral protector 7.

FIG. 2 shows a variant of the device with an elastic strand 8 wire spirals in the form of three loops (three loop elastic strand of wire spirals), with four bolt clamps 9, 10, 11, 12, with which the elastic strand 8 is installed on the wire (cable, cable) 13 through a protective spiral protector 14 and with a supporting clip 15 for suspending the device on an overhead power line or communication through a protective spiral protector 16.

FIG. 3 shows a variant of the device with an elastic strand 17 of wire spirals in the form of a single loop, with two bolt clamps 18, 19, with the help of which the strand 17 is installed on the wire (cable, cable) 20 through a protective spiral protector 21, with a supporting clip 22 for hanging the device on an overhead power line or communication through a protective spiral protector 23 and with distributed elements 24.

FIG. 4 shows a variant of the device with an elastic strand 25 of wire spirals in the form of a single loop, with two bolt clamps 26, 27, with the help of which the strand 25 is installed on the wire (cable, cable) 28 through a protective spiral protector 29, with a supporting clip 30 for hanging the device on an overhead power line or communication through a protective spiral protector 31 and with lumped elements 32.

FIG. 5 shows a variant of the device with an elastic strand 34 of wire spirals in the form of a single loop, with two spiral clamps 35, 36, with which the strand 34 is attached to a wire (cable, cable) 37, with a supporting clamp 38 for hanging the device on an overhead power line, or communication through protective spiral protector 39.

The elastic strand of 1, 8, 17, 25, 34 wire spirals is made from at least one piece of rope or single or double strand wire. Fastening of elastic strand 1, 8, 17, 25, 34 wire spirals on a wire (rope, cable) 4, 13, 20, 28, 37 is carried out using bolt clamps 2, 3, 9, 10, 11, 12, 18, 19 , 26, 27 or spiral clamps 35, 36.

Distributed elements 24 are located on the elastic strand 17 of wire spirals, made in the form of at least one single-layer or multi-layer set of additional wire spirals wound on it, which allow changing the stiffness of the elastic strand 17 (Fig. 3).

On the elastic strand 25 of the wire spirals there are concentrated elements 32, made in the form of weights, which are attached to the elastic strand 25 of the wire spirals using additional attachment points, are distributed along its length and are intended to weight the elastic strand 25 (Fig. 4).

The invention works as follows on a specific example of the implementation of the claimed technical solution:

FIG. 6 shows the dependences of the vibration amplitude on the frequency of a steel-miniature wire having a cross-section of an aluminum part of 185 cm ² , a steel part of 43 mm ² , an outer diameter of 19.6 mm, a breaking force of a wire of 77.7 kN, a linear mass of 0.846 kg / and, at a point distance from the point of exit of the wire (cable, cable) at a distance of 89 mm (generally accepted recommendations). The permissible value of the vibration amplitude (row 3) was determined according to generally accepted relationships. At a given value of the amplitude at the point where the wire leaves the supporting clamp, bending stresses arise, at which, after applying 108 vibration cycles, fatigue failure of the wires of the wire (10 MPa) can occur.

At the same time, the introduction of the proposed device for damping wind vibration of wires, cables, cables (loop-type vibration damper) into the practice of power grid construction will increase the resistance of overhead power transmission lines and communications to low-frequency vibration, especially in long spans, and the use of distributed and concentrated additional elements that make the elastic strand heavier and (or) change its rigidity will significantly reduce the range of vibration dampers.

Sources of information:

[1] Description of the invention to the author's certificate No. 1725310 "Overhead power line", H02G 7/14, declared on 04/09/1990, published on 04/07/1992.

[2] Description of the invention to patent No. 2365009 "Dancing damper for wires of overhead power lines", H02G 7/14, declared on 08.07.2008, published on 20.08.2009.

[3] Description of the invention to the patent No. 2549204 "Dancing damper for wires of overhead power lines", H02G 7/14, declared on 08.07.2008, published on 20.08.2009.

[4] Description of the invention to the patent No. 2484568 "Dancing damper for overhead power line wires", H02G 7/14, declared on 08.07.2008, published on 20.08.2009.

[5] Description of the invention to the inventor's certificate No. 364274 “Method of quenching the dance of wires, H02G 7/14, declared 05.05.1966, published 25.04.1990.

[6] US Patent No. 4159393, H02G 7/14, published 06/26/1979.

[7] Description of the invention to the patent No. 2316865 "An improved damper for the dance of wires of an overhead power line", H02G 7/14, published on 10.02.2008.

Claims (3)

1. A device for damping wind vibration of wires, cables, cables, containing an elastic strand of wire spirals, characterized in that the elastic strand of wire spirals in the form of a loop is installed on a wire, cable, cable or on a linear clamp using at least two clamps, when At the same time, distributed elements and / or lumped elements located along its length are located on the elastic strand of wire spirals, designed to make the elastic strand heavier and / or change the rigidity. 2. The device according to claim 1, characterized in that the aforementioned distributed elements are made in the form of at least one single-layer or multi-layer set of additional wire spirals wound on an elastic strand. 3. The device according to claim 1, characterized in that the aforementioned lumped elements are made in the form of weights fixed on an elastic strand of wire spirals by means of additional nodes and distributed along its length.

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