RU116704U1 - WIRE EXTINGUISHER AND WIRE ELECTRIC TRANSMISSION LINE WITH SUCH EXTINGUISHER - Google Patents

Abstract

1. An oscillation damper for the wire of an overhead power line, containing an elastic rod, a clamp designed to fasten the elastic rod parallel to the wire, and weights fixed by the middle part at the ends of the elastic rod, each of which is stretched along its longitudinal axis, characterized in that the weights are fixed across the elastic rod, and each natural frequency fP of the vibration damper satisfies one of the conditions:! fР <fH or fР> fB,! where fH and fB are the lower and upper limits of the wire vibration frequency range. ! 2. A damper according to claim 1, wherein each weight is made in the form of a length of steel pipe filled with a heavy metal such as lead. ! 3. An overhead power transmission line containing supports, on which an electric wire is fixed with insulators and clamps, and a wire vibration damper in at least one of the overhead transmission line spans, characterized in that the wire vibration damper is made according to any one of paragraphs. 1 and 2.

Description

Technical field

The proposal relates to the electric power industry and can be used to protect wires and lightning protection cables of an overhead transmission line (OHL) from wind vibrations.

State of the art

In the wires (and in lightning cables), under the influence of wind, a stable vibration can occur in the frequency range characteristic of a given wire (aeolian vibration). Aeolian vibration with a sufficiently large range and duration of oscillations can lead to fatigue damage to the wire. Protection from aeolian vibration is carried out using vibration dampers [Electrical Installation Rules (PUE), seventh edition, Energoservice, 2003, clause 2.5.85].

Known, adopted as a prototype, a vibration damper of an overhead power line wire, comprising an elastic rod, a clamp for fastening the elastic rod parallel to the overhead line, and loads, each of which is elongated along its longitudinal axis [patent RU 2262173]. In the prototype, the loads are fixed at the ends of the elastic rod so that their longitudinal axis is directed along the elastic rod, coincide with its longitudinal axis or parallel to it.

The disadvantage of the prototype is the possibility of occurrence in the system "wire with a damper" stable resonant oscillations, the amplitude of which exceeds the permissible value.

The objective of the utility model is to eliminate this drawback.

Utility model creature disclosure

The technical result of the utility model is to increase the reliability of protecting wires and lightning cables of overhead lines from aeolian vibration.

The subject of a utility model is an oscillation damper of an overhead power line wire, comprising an elastic rod, a clamp for fastening the elastic rod parallel to the wire, and loads, each of which is stretched along its longitudinal axis, fixed at the ends of the elastic rod, characterized in that the loads are fixed across the elastic rod, and each natural frequency f _P vibration damper satisfies one of the conditions:

f _P <f _H or f _P > f _B ,

where f _N and f _In - the lower and upper boundaries of the frequency range of vibration of the wire.

This allows you to get the specified technical result.

The utility model has a refinement development, consisting in the fact that each load is made in the form of a piece of steel pipe filled with heavy metal, for example, lead.

The object of the utility model is also an overhead power transmission line containing supports on which an electric wire is fixed using insulators and clamps, and the proposed vibration damper of the wire in at least one of the spans of an overhead power transmission line.

When passing overhead lines in areas with high wind loads, power lines equipped with the proposed vibration dampers are characterized by increased reliability.

The implementation of the utility model, taking into account its development.

Figure 1 shows the inventive damper placed on the wire 1.

The damper comprises an elastic rod 2, a clamp 3 for attaching the damper to the wire 1 and loads 4.

Weights 4 are fixed at the ends of the rod 2. Each load 4 is elongated along its longitudinal axis 6 and can be made, for example, in the form of a cylinder or a square bar.

Loads 4 of this form are placed across the rod 2. Each load 4 is fixed with its middle part at the corresponding end of the rod 2.

The clamp 3 is fixed on the rod 2 in its middle and is mounted on the wire 1 so that the rod 2 and its longitudinal axis 5 are parallel to the wire 1. In this case, the wire 1, the rod 2 and the clamp 3 are located in a vertical plane, and the axis 6 and the axis 5 in horizontal.

The damper is characterized by natural frequencies f _P , the position of which on the frequency axis depends on the design characteristics of the damper [Trofimov S.V. Analysis of the results of calculations of the effectiveness of the vibration damper on a sample of wire AC 120-19.//Electro. Electrical engineering, electric power industry, electrical industry. 2011 No. 2].

The inventive overhead line contains supports 7 (one of them is shown in FIG. 1), on which wire 1 is fixed using insulators 8 and supporting or tension clamps 9, and the proposed vibration damper located on wire 1, in at least one of the overhead spans .

A typical range Δf vibrations, wherein in overhead track may arise vibrations wire 1 has a lower limit f _H and f _in the upper limit. Values of f _H and f _B. in Hertz are f _H = 0.18 / d and f _B = 1.4 / d, respectively, where d is the diameter of the wire 1 in meters [IEC 61897-1998. Overhead lines. Stockbridge Aeolic Vibration Absorber Requirements and Testing].

The proposed design of the absorber with the arrangement of goods across the elastic rod allows you to take the eigenfrequency f _{P of the} absorber outside the range ∆f between the frequencies f _N and f _In . This makes it possible to increase the reliability of wire protection against aeolian vibration and, ultimately, ensures more reliable operation of overhead lines equipped with such a damper.

Claims (3)

1. The vibration damper of the overhead power line wire, comprising an elastic rod, a clamp for fastening the elastic rod parallel to the wire, and weights secured with a middle part at the ends of the elastic rod, each of which is elongated along its longitudinal axis, characterized in that the weights are secured across the elastic rod, and each natural frequency f _{P of the} vibration damper satisfies one of the conditions: f _P <f _H or f _P > f _B , where f _H and f _B - the lower and upper boundaries of the frequency range of vibration of the wire. 2. The damper according to claim 1, in which each load is made in the form of a piece of steel pipe filled with heavy metal, such as lead. 3. An overhead power transmission line containing supports on which an electric wire is fixed using insulators and clamps, and a vibration damper of the wire in at least one of the spans of the overhead power transmission line, characterized in that the vibration damper of the wire is made according to any one of paragraphs. 1 and 2.