RU2319244C1 - Pin insulator using flexible spiral wire for conductor fixation - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: proposed pin insulator that can be used for erecting overhead power transmission lines to protect them against fatigue vibration damage has flexible spiral wires fixed within its body. Conductor is attached to insulator simply by winding spiral wires on conductor. No tool is required for attaching conductor to insulator.

EFFECT: facilitated installation and wiring, reduced fatigue damage to conductor in the course of insulator use.

1 cl, 2 dwg

Description

Technical field

The invention relates to the field of electrical engineering and can be used in the installation of overhead power lines (VLEP) to protect wires from fatigue vibration damage and simplify their installation on pin insulators.

State of the art

When using pin insulators in power lines, the strength of fastening the wire to the insulator head is essential for the reliability of the line. The task is difficult due to the impossibility of using traditional methods of joining parts adopted in mechanical engineering: welding, soldering, bolting, pressing, etc. The impossibility of using these methods is due to the properties of the materials used for traditional insulators: porcelain, glass. Typically, for securing the wire, the insulator has side and upper grooves on its upper part. The wire is fixed in the grooves by wrapping with a special wire the insulator neck and wires. Installation of wires on insulators is laborious and time consuming. In order to simplify the installation and accelerate the fastening of the wire on the insulator in the invention RU 2113741, the insulator contains a metal cap with diametrically located sector recesses. The disadvantage of this type of insulator is the need to fix the insulator on the traverse from turning relative to the power line, unreliable fastening of the wire in case the insulator rotates.

Currently, traditional linear fittings are often replaced by spiral fittings, which has significant advantages over clamps of traditional designs (US 473321, US 4409433, GB 1206548, US 6646208, GB 2338118, JP 7-312130, US 4741097, RU 2175805, RU 2231188, US 3684221, WO 97/41627). Such reinforcement provides reliable fastening of the wire, protects it from excesses, abrasions, and other mechanical damage; while there is a uniform distribution of compressive forces along the length of the wire, the exclusion of their local concentrations; installation of spiral clamps is simple and does not require the use of special tools and devices.

However, all designs relate to independent devices for attaching the wire to the insulator. All devices contain elements or zones by which they themselves are fixed on the insulator, such as, for example, device JP 6005143, in which the spiral clamp is rigidly attached to a cap having eyelets directed upwards for laying the cable. The cap is mounted on an insulator or other device before mounting the cable. The cap fastening is rather complicated, since the device is designed to fasten a spiral clamp or wire on an insulator made of traditional dielectric material (porcelain, glass), to which it is impossible to attach the spiral clamp wires in a simple way.

Recently, polymer insulators with a tip for attaching plastic or metal wires have become widespread. So in the patent WO 03/081610 the insulators have heads with grooves for attaching the wires, made of plastic coated with a protective sheath. With the advent of such insulators, it has become possible to manufacture an insulator comprising a wire holder. An example is the closest analogue of US 5981878. The polymer insulator contains a metal head, inextricably connected to the insulator and which is its integral part. The metal tip can be made both with traditional grooves for fastening the wire, and with a clamping metal die on the screws. The latter has a drawback. In the insulator there is the possibility of damage to the wire as a result of fatigue stresses from vibration and dancing of the wire. To exclude these damages, the tip on which the wire lies must have a diameter in diameter of at least 10-15 diameters of the wire. In addition, the bolt clamp of the wire must be checked and tightened at regular intervals.

The solution to this problem is the use of elastic spiral wires (1) for fastening the wire, rigidly fixed in the body of the insulator (2) and which are its integral part. Elastic spiral wires are often used in special devices designed to attach a wire or cable to structures. Such devices also have means or devices for fastening the devices themselves to structures or for attaching to suspension or pin insulators.

The purpose of the invention

The invention solves the problem of creating a pin insulator for insulation and fastening of live parts in switchgears of stations, substations, power lines, with reliable and easy wire fastening during installation and operation.

Description

The proposed device is an insulator with rigid spiral wires (1) rigidly fixed in the body of the insulator (2).

In the proposed design of the insulator, the elastic spiral wires (1) are an integral part of the insulator (2), therefore, no additional adapter is required for fastening the wire and there is no need to fasten such a device in turn to the insulator.

The wire is fastened to the insulator simply by winding spiral wires onto the wire. An insulator with such a fastening allows fast and reliable fastening of the wire. The reliability of the wire installation on the proposed insulator is much higher than when installing the wire through a separate device, since the spiral wires are reliably built into the insulator before installation. The installation technology is simple and convenient in the field of building power lines or replacing old insulators. Elastic spiral wires, in addition to fastening, perform a protective function against excesses during vibration and wire dancing under the influence of wind. When using the proposed insulators, the vibration of the wires is significantly reduced, since the vibration energy is converted into the deformation energy of the elastic spiral wires. Spiral wires in the manufacture of the insulator can be mounted in a polymer or metal head of the insulator by welding, gluing, soldering, pressing, bolting.

The result of using such an insulator is to simplify installation, quickly fasten the wire to the insulator without a tool, reduce the vibration of the wire attached to such an insulator, and reduce the fatigue damage of the wire over time.

Brief Description of the Drawings

In Fig.1 shows a view of the insulator from the side of the wire, Fig.2 is a view of the insulator from the side.

The wire in figure 1 and figure 2 conventionally not shown.

1 - elastic spirally preformed wire

2 - insulator body

Implementation example

The experimental batch of insulators manufactured at the applicant plant showed, according to the test results, high performance superior to all other structures consisting of an insulator, a device for attaching the wire and the wire itself. Tests on a vibration installation simulating dance and vibration of wires showed an increase in the trouble-free life of the insulator-wire system by more than 2 times in comparison with the traditional method of tying the wire to the head of the insulator.

Claims (1)

An insulator containing means for attaching wires to it in the form of elastic wires transformed into spirals, characterized in that the spiral wires are inseparably connected to the insulator and are an integral part thereof.

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