RU2312439C1 - Stagger-peaked vibration damper - Google Patents

Abstract

FIELD: power engineering; vibration dampers for conductors and ground wires of overhead power transmission lines.

SUBSTANCE: proposed vibration damper has elastic damping member (ground wire) with counterweights and clamp. The latter is attached to conductor on one end and to ground wire, on other end. Counterweights are made in the form of C-shaped stems having long and short arms and pipe connection wherein ground wire is secured. Counterweight arm length is found from known equation and distance between attachment point of counterweights on ground wire and attachment point of clamp is calculated from formula given in invention specification. Tests have shown that proposed vibration damper reliably functions in operating frequency band of 5 to 150 Hz. Proposed stagger-peaked vibration dampers have been launched in serial production.

EFFECT: enhanced effectiveness of vibration-damper frequency and power characteristics.

1 cl, 3 dwg

Description

The invention relates to the electric power industry, in particular to vibration dampers for wires and lightning protection cables of overhead power lines.

Currently, significant success has been achieved abroad and in a number of countries in the field of creating improved designs of vibration dampers for wires and cables of overhead power transmission lines. This task is especially relevant for ensuring the reliability of fiber-optic cables suspended to the supports of overhead power transmission lines, both metal (OKNN) and built-in to lightning protection cables (OKCH-OPGW).

A known aeolian vibration damper for overhead power line wires, comprising an elastic damper element (cable), inertial elements (loads) made of a C-shaped rod shape and fixed at the ends of the cable, as well as a clip for hanging on the wire, fixed at one end to the cable, and others attached to the wire [1].

This vibration damper is essentially a Stockbridge type vibration damper, except that its inertial elements (weights) are made of a special C-shaped rod shape. Therefore, it works as a standard Stockbridge vibration damper and, accordingly, has the same disadvantages. On the curve of the frequency-energy characteristics of the Stockbridge-type vibration damper, a characteristic “dip” is observed between the two peaks characterizing the frequency ranges at which the vibration damper has maximum efficiency in terms of the dissipated energy. In the region of frequencies falling at this minimum in the frequency-energy characteristic, a wire protected by this damper may have less effective protection against vibration.

The closest technical solution to the proposed one is a multi-resonant vibration damper for overhead power transmission wires and self-supporting fiber-optic communication cable cables, comprising an elastic damper element made in the form of a multi-wire cable, loads of various weights, made in the form of curved rods fixed at the ends cable, and a clip for hanging on the wire, fixed at one end to the cable, and the other attached to the wire [2].

However, this damper has significant disadvantages:

- the design of this damper is such that its loads are located in a vertical plane, so it will not create torque on the elastic damper element fixed in the holder; this significantly limits the functionality of the damper and reduces its effectiveness in damping vibration of wires of overhead power lines or self-supporting fiber-optic cables of communication lines;

- a change in the total mass of each cargo and its geometric dimensions is achieved in this technical solution by crimping the bushings on an elastic damper element and a long part of the cargo rods, which is structurally and technologically difficult to perform;

- the design of the damper is very complex and time-consuming to manufacture.

The applicant set himself the task of developing a multi-resonance vibration damper that surpasses well-known vibration damper in its frequency-power characteristics. A positive technical result from the use of the claimed damper is to achieve the possibility of increasing the uniformity of the frequency-power characteristics of the damper in the operating frequency range due to the rational choice of masses and geometry of the loads and their location relative to the clamp for suspension on the wire, that is, ultimately, to increase efficiency vibration dampers, namely damping vibration in the operating frequency range. This positive technical result is achieved due to a new set of essential structural features of a multi-resonant vibration damper, which is fixed in the following claims: “multi-resonant vibration damper for overhead power transmission wires and self-supporting fiber-optic communication cables containing an elastic damper element made in the form of a multi-wire cable , different in weight cargo made in the form of curved rods fixed at the ends of the cable, and m for suspension on a wire, fixed at one end to a cable and attached to the wire with the other; loads made in the form of a C-shaped rod with shoulders of various lengths and a pipe fixed in the middle thereof are located in the horizontal plane to provide the torsional moment of the loads around the elastic damper element, while the length of the shoulders of the C-shaped rods is selected from the relation

,

,

and the distance from the point of fastening of goods at the ends of the elastic damper element to the point of fixation of the clip for the suspension on the wire on the elastic damper element is determined by the formula:

,

,

- расстояние от точки закрепления первого груза на упругом демпферном элементе до точки крепления зажима для подвески гасителя на проводе на упругом демпферном элементе,

- расстояние от точки закрепления второго груза на упругом демпферном элементе до точки крепления зажима для подвески гасителя на проводе на упругом демпферном элементе».where k is taken within 1 ÷ 0.7, L _b is the length of the large shoulder of the C-shaped rod, L _m is the length of the short shoulder of the C-shaped rod,

- the distance from the fastening point of the first load on the elastic damper element to the attachment point of the clip for suspension of the damper on the wire on the elastic damper element,

"the distance from the point of attachment of the second load on the elastic damper element to the attachment point of the clip for the suspension of the damper on the wire on the elastic damper element."

The invention is illustrated by drawings, where figure 1 shows a General view of a vibration damper, made according to the present invention, a front view; figure 2 is the same as in figure 1, a top view; in Fig.3 is the same as in Fig.1, a photograph of a vibration damper ready to be sent to the line.

A multi-resonant vibration damper for overhead power transmission wires and self-supporting fiber optic cables 1 of the communication lines consists of an elastic damper element 2 (multi-wire steel cable), on which loads 3 (inertial elements) are fixed, and a clamp 4, on one side fixed on the wire 1 and with another attached to the elastic damper element 2. Each damper load 3 is made in the form of a C-shaped rod 5 with a long 6 and short 7 shoulders and a pipe 8 attached to the middle of the rod 5. In the pipe 8 is fixed yayutsya example opressovaniem ends of the elastic damping element 2 in such a way that the goods 3 with respect to the terminal 4 housed in a horizontal plane or a plane close to the horizontal plane. This allows you to create a torque load 3 relative to the cable 2 and to achieve effective damping of torsional vibrations of the wire 1.

Clamp 4 is made of extruded aluminum profile, which allows to unify it for two size ranges of diameters of the protected wire lines.

The design of the proposed damper provides a simple opportunity to change the total mass of each load 3, its geometric dimensions, change the position of the center of gravity of the load 3 relative to the point 9 of its closure and create torque on the cable 2, fixed in the clamp 4. These changes are achieved by calculating the lengths of the shoulders 6, 7 of the rod 5 and the distance from the points 9 of the load 3 on the cable 2 to the point 10 of the clamp 4 on the cable 2. For example, the length of the shoulders 6, 7 of the C-shaped rods 5 is selected from the ratio

,

,

a the distance from the point of fixation (seal) 9 of cargo 3 at the ends of the elastic damper element 2 to the point 10 of the fixation of the clamp 4 for suspension on the wire 1 on the elastic damper element 2 are determined by the formula:

,

,

- расстояние от точки 9 закрепления первого груза 3 на упругом демпферном элементе 2 до точки 10 крепления зажима 4 для подвески гасителя на проводе 1 на упругом демпферном элементе 2,

- расстояние от точки 9 закрепления второго груза 3 на упругом демпферном элементе 2 до точки 10 крепления зажима 4 для подвески гасителя на проводе 1 на упругом демпферном элементе 2.where k is taken within 1 ÷ 0.7, L _b is the length of the large arm 6 of the C-shaped rod 5, L _m is the length of the short arm 7 of the C-shaped rod 5,

- the distance from the point of attachment of the first load 3 on the elastic damper element 2 to the point of attachment 10 of the clip 4 for suspension damper on the wire 1 on the elastic damper element 2,

- the distance from the point 9 of securing the second load 3 on the elastic damper element 2 to the point 10 of the attachment of the clamp 4 for suspension of the damper on the wire 1 on the elastic damper element 2.

The proposed multi-resonance vibration damper is assembled as follows.

At the ends of the steel multi-wire cable 2, the pipe 8 weights 3 are mounted and secured, for example, by the most common and reliable method of crimping. Then the clamp 4 is fixed at the calculated point 10 on the cable 4 and is fixed with its die on the wire (cable) of 1 line.

The inventive multi-resonant vibration damper provides an effective damping of vibrational vibrations of the wires of overhead power lines and self-supporting fiber-optic cables of communication lines in the frequency range from 5 to 150 Hz, as shown by the results of tests carried out by VNIIE on three modifications of the vibration damper mockup with the weight of the goods 0.8 kg fixed on a steel cable with a diameter of 9.1 mm. Moreover, the options for frequency-power characteristics obtained for these three variants of mass composition of vibration damper loads showed an almost unlimited possibility of increasing the uniformity of the frequency-power characteristics of vibration damper due to the rational choice of mass and geometry of the vibration damper weights and their location relative to the clamp for fixing on the wire (cable).

MZVA CJSC has launched serial production of the proposed multi-resonance vibration dampers.

Information sources:

1. US patent No. 3052747 "Aeolian Vibration Dampers", class 174-42, published 04.09.1962.

2. Patent of the Russian Federation No. 2228567 "Multi-frequency vibration damper", class Н02G 7/14, published on 05/10/2004, Bull. No. 13.

Claims (1)

A multi-resonant vibration damper for overhead power lines wires and self-supporting fiber-optic cables for communication lines, comprising an elastic damper element made in the form of a multi-wire cable, loads of various weights made in the form of curved rods fixed to the ends of the cable, and a clip for suspension on the wire, fixed at one end to a cable and fastened to the other with a cable, characterized in that the cargo is made in the form of a C-shaped rod with shoulders of various lengths and a pipe fixed along its united, are arranged in a horizontal plane to provide a torsional moment around the cargoes elastic damper element, the shoulder length of the C-shaped rods is chosen from the relationship

and the distances from the point of fastening of goods at the ends of the elastic damper element to the point of fixation of the clip for the suspension on the wire on the elastic damper element are determined by the formula

where k is taken within 1 ÷ 0.7, L _b is the length of the large shoulder of the C-shaped rod, L _m is the length of the short shoulder of the C-shaped rod,

- the distance from the fastening point of the first load on the elastic damper element to the attachment point of the clip for suspension of the damper on the wire on the elastic damper element,

- the distance from the point of attachment of the second load on the elastic damper element to the attachment point of the clip for the suspension of the damper on the wire on the elastic damper element.

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