RU2334327C1 - Spreader-suppressor for two phase-splitted conductors of aerial power line - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: spreader-suppressor represents an annular enclosed flexible element and the limiter of the said element motion caused by the cable vibrations. The flexible element is made up of a multi-conductor steel cable in a preformed state. The cable is fastened by clamps to the power line wires. The motion limiter represents a cantilever arm with a cylindrical weight. The cantilever arm length should be selected so that to make, at least, ¼ of the cable diameter measured along the lengthwise axis of the rod arranged between the spreader clamps. The rod with the weight overlaps the spreader axis of symmetry to allow the most optimum conditions for the system operation in eccentric position which is extremely important for suppression of the cables vibrations. The weight is located vertically in the plane perpendicular to the flexible element plane.

EFFECT: efficient suppression of vibrations, subvibrations and dancing on aerial power lines with two wires in splitted phase.

3 cl, 2 dwg

Description

The present invention relates to the field of electric power, and more specifically to spacer dampers designed to be fixed on two wires of a split phase overhead transmission line.

Known spacer for two wires of the split phase of the overhead power line, made in the form of a closed annular elastic element (cable), fixed in two places by means of die clips on two wires of the split phase of the overhead power line [1].

This spacer can not work effectively as a dampener for vibrations of wires arising on overhead power lines, since only an elastic element (cable) is used here as a damping element, which is clearly not enough; in addition, this spacer is not suitable for damping the dancing of wires, since it cannot affect the torsional vibrations of the wires of the split phase; due to the fact that the spacer in question is flexible, it may have problems ensuring a predetermined distance between the wires, especially when short-circuit currents are applied (a flexible cable does not have sufficient rigidity to withstand large compressive forces arising from short-circuit currents).

The closest technical solution in relation to the proposed one is a spacer-suppressor for two wires of the split phase of an overhead power line, comprising a housing made in the form of an elastic element in the form of a closed ring, fixed by clamps on the wires, and a limiter to move the elastic element, mounted on one of spacer clamps [2].

In the strut-damper, which is the closest analogue to the claimed technical solution, two limiters of movement of the elastic element (cable) are used, which are located symmetrically with respect to the horizontal axis of the strut. Such a symmetrical design, firstly, does not work when dancing wires due to the lack of factors in the design to influence the torsional vibrations of the phase wire; secondly, the shape and symmetrical arrangement of the rope limiters do not allow to secure the spacer from corona discharges (in this design variant, the development of the crown along the limiters will occur with a high degree of probability); thirdly, insufficient length of the limiters reduces the rigidity of the entire system and, as a result, difficulties may arise in ensuring the necessary distance between the wires of the split phase of the line.

In the claimed technical solution, the authors proposed a design variant of the spacer-suppressor for two wires of the split phase of the overhead power line, which differs significantly from the known analogues in terms of the achieved result; namely: effective damping of wire vibrations arising during operation, in particular aeolian vibration, dance and sub-vibrations; the absence of corona discharges on the spacer elements; simplicity of design and accessibility of the production process. The above-mentioned positive technical result is achieved due to a new set of essential structural features of the spacer-damper described in the following claims: “spacer-damper for two wires of the split phase of an overhead power line, containing a housing made in the form of an elastic element in the form of a closed ring, fixed by means of clamps on the wires, and a limiter of movement of the elastic element, mounted on one of the clamps of the spacer; the limiter of movement of the elastic element, made in the form of a cantilever arm with a load at its end, is located between the wires of the split phase of the line eccentrically relative to the elastic element so that part of the cantilever arm with the load overlaps the horizontal axis of symmetry of the spacer at a distance l of at least a quarter from the diameter D of the ring of the elastic element, measured along the longitudinal axis of the cantilever arm between the spacer clamps, while the load is made in the form of a cylinder with rounded ends E surfaces, located in a vertical plane perpendicular to the horizontal plane in which the resilient member providing tangency conditions and its collision with the clip when a dance wires; cantilever arm is made in the form of a rigid rod; a multi-wire preformed steel cable with the number of wires in it up to 19 pieces was used as an elastic element. ”

The invention is illustrated by drawings, where figure 1 shows a General view of the spacer-damper for two wires of the split phase of an overhead power line made according to the present invention, a front view, perpendicular to the wires of the phase; figure 2 is the same as in figure 1 is a side view along the phase wires.

The proposed spacer-absorber for two wires 1 of the split phase of the overhead power line consists of an elastic element 2, which is fixed between the wires of the 1 phase by means of clamps 3, 4. As an elastic element 2, a multi-wire steel cable (rope) located after a special mechanical processing in a preformed state, that is, in a state when the cable is given a certain shape in advance due to transverse crimping. The number of wires in the cable varies depending on operating conditions up to 19 pieces. To one of the clamps, for example, clamp 3, is attached a limiter for the movement of the elastic element 2, made in the form of a cantilever arm 5 with a load 6 at its end; alternatively, the cantilever arm 5 can be made in the form of an elongated rigid rod. The load 6 is made in the form of a cylinder with rounded end surfaces 7 and is located in a vertical plane perpendicular to the horizontal plane in which the elastic element 2 is located. The vertical arrangement of the load 6 creates conditions for touching or colliding with the clamp 4 of the spacer when the wires dance when the cantilever arm 5 with a load of 6 begins to deviate during torsional vibrations of the wire of the split phase of the line.

The limiter of movement of the elastic element 2 is mounted in the spacer between the wires 1 of the split phase of the line so that the cantilever arm 5 and the load 6 at its end extend beyond the horizontal axis of symmetry 8 of the spacer approximately a distance l equal to a quarter of the diameter D of the ring of the elastic element 2, this diameter D is measured along the longitudinal axis of the cantilever arm 5 between the clamps 3, 4 of the spacer. This allows the spacer to act on torsional vibrations when dancing wires due to the eccentric design.

The invention works as follows:

As a result of the influence of the wind flow around the wire 1, a vibration (aeolian) develops at the corresponding natural frequency with oscillation amplitudes of the order of the diameter of the wires 1. A decrease in the level of such vibration will be achieved in this design of the spacer due to the properties of the used elastic element 2 (damper cable), and namely, its geometrical dimensions, mechanical characteristics of bending stiffness, self-damping ability, determined by the value of power dissipation in it at various levels of vibration . In addition, due to the cantilever arm (rigid rod) 5 with the load 6, mounted on one of the clamps 3, the spacer is able to act as a damper for dancing wires 1, since the eccentric arrangement of the cantilever arm (rigid rod) 5 relative to the horizontal axis 8 provides an impact on torsional vibrations of the wire 1 of the split phase.

The inventive spacer-absorber for two wires of the split phase of an air power transmission allows you to effectively dampen all types of wire vibrations arising on the line (vibration, dance and sub-vibrations); it is simple in its design and technological process of production and, therefore, can be recommended for delivery to overhead power lines in various regions of the country.

Information sources

1. Italian patent No. 504267, class IX (Н02G 7/12), published on December 10, 1954.

2. Japan patent No. 4 - 13932, class H02G 7/12, 1969

Claims (3)

1. Spacer-suppressor for two wires of the split phase of the overhead power line, comprising a housing made in the form of an elastic element in the form of a closed ring, fixed by clamps on the wires, and a limiter to move the elastic element, mounted on one of the clamps of the spacer, characterized in that the limiter of movement of the elastic element, made in the form of a cantilever arm with a load at its end, is located between the wires of the split phase of the line eccentrically relative to the elastic element with such so that part of the cantilever arm with the load overlaps the horizontal axis of symmetry of the strut by a distance l equal to at least a quarter of the diameter D of the ring of the elastic element measured along the longitudinal axis of the cantilever arm between the clamps of the strut, while the load is made in the form of a cylinder with rounded end surfaces, located in a vertical plane perpendicular to the horizontal plane in which the elastic element is located, providing conditions for touching and colliding with the clamp when and dancing wires. 2. The spacer according to claim 1, characterized in that the cantilever arm is made in the form of a rigid rod. 3. The spacer according to claim 1, characterized in that the multi-wire preformed steel cable with the number of wires in it up to 19 pieces is used as an elastic element.

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