SU1381635A1 - Aerial power line section - Google Patents

Abstract

The invention relates to electrical engineering and can be used to protect transmission lines with voltages higher than 1000 V from emergency shutdowns caused by wire splitting. The goal is to increase the reliability of the line by protecting the wires from damage and facilitating installation. A device is installed in the line section to prevent the wires from overlapping. It is made of two insulators and a smooth elongated element located between them of a dielectric material that is hinged together. The device is installed at an angle of 40-45 to the wires of the line. The goal is achieved by the implementation of a device to prevent the wires from overlapping and installing them between the wires. 2 Il. i cl

Description

113

The invention relates to electrical engineering, in particular, to the protection of power lines with a voltage of over 1000 V against emergency shutdowns due to wire splitting.

The aim of the invention is to improve reliability by protecting the wires from damage and facilitating installation.

FIG. 1 is a schematic representation of a portion of a transmission line with a device installed between the wires to prevent the wire Bi from being whipped in FIG. 2 - the same, in the event of wire oscillations.

The section of the overhead power line Contains a device for preventing wire bindings, consisting of insulators 1 and a smooth elongated element 2 of dielectric material connected by a hinge, inclined to the axes of wires 3 to prevent them from blending at an angle of 40-45 °.

With an inclined arrangement of the device to prevent the wires from overlapping, the wires do not move relative to one another. In this case, the device operates with vibrations of the wires connected by it only for stretching. Point A without a strut moves with oscillations along the path A of the C-A-AC (Fig. 1). With a spacer, point A can move along the Rc-A-T path. However, such a movement is possible only for short distances yb and yn due to elastic elongation and straightening when the wire is raised up and down, respectively. I

A similar effect occurs on point B when it is moved to the outer side of the wire. In this case, point B cannot move further than nH, since this is prevented by the friction force in the wire, i.e. only movement of elastic elongation occurs.

The movement of point B to the inner side (toward the adjacent wire) is also limited by the fact that when the amplitude is small, the amplitude of the motion to the inner side is also limited.

In the device to prevent wire clasping, serial polymer materials can be used.

L toors, including from press materials. A device to prevent wire from overlapping using a press material element as an insulator is simple. The smooth elongated element may be drawn from cheap non-deficient materials, such as wood treated with polymer (wood plastic).

The use of a smooth elongated element of a dielectric material in the device makes it more economical

The length of the isolators in the device

to prevent the wires from clinging on the line section 4–5 times smaller than the wire size

High tension floor occurs only on the edges of the device

near wires, i.e. on insulators, which contributes to greater reliability and durability.

Installing a device to prevent the wires from stripping between the lower and middle wires (meaning the vertical arrangement of the wires) is most effective. When the ice is reset, the lower wire jump is limited by the device, and when the medium jumps to the upper wire, the middle wire is held by the device attached to the lower wire.

Under the influence of falling ice deposits or wind loads

the bottom wire approaches the middle and the phases close. When installing devices in the middle part of the span, an additional rigidly fixed point appears and the drive behaves as if an additional support is installed in it and, therefore, the phase closure is eliminated (Fig. 2). Thus, the span is reduced by 2 times,

and the oscillation amplitude of the wire is significantly reduced.

In areas where strong gusting winds are observed, the number of struts in the span can be increased to three. The arrangement of the three devices is possible in one section and broken down along the span. I

Installation of isolation devices on

The lines are drawn in the following rdke

Initially, the areas and spans are defined where the most often the wire clings occur and requires

Claims (1)

with measures to prevent it. The number of devices in the span and the distance between HHMHj are determined. It is recommended to place the devices in different sections of the span by 1/3 and 2/3 of the span in order to combat the main harmonics arising during the installation. designs. The struts are mounted from the tower when the necessary safety requirements are fulfilled. Invention Formula An overhead transmission line with a voltage higher than 1000 V, comprising wires between which a device for preventing their splitting is installed, made in the form of a smooth elongated element of a dielectric material and insulators arranged at its ends, characterized in that, in order to increase reliability by protecting the wires from damage and ease of installation, the insulators are connected with a smooth elongated element of dielectric material pivotally, while the angle of inclination of the device to prevent wires from clinging to the axes of the wires is in the limit x 40-45. Op2  Onr Ph Onl FIG. J CM g : 5 s