RU2619090C1 - Non-isolated cable (versions) - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: cable is made in three versions. In the first version, the wires of the uninsulated cable are made of aluminium. In the second version, the wires for the cable are made of an alloy based on aluminium. In the third version, the wires for the cable are made of a heat-resistant aluminium-based alloy. The non-insulated cable for each of the three versions is made with a linear contact of the wires with each other, with the same pitch of the layers in one direction, the outer surfaces of the wires are laid with gaps of 2-10% of the nominal diameter of the wires, plastically deformed with a reduction ratio of 10-14% of the cross-section area.

EFFECT: invention makes it possible to increase the breaking strength with respect to the uninsulated cables used, to increase the design cross-section, to reduce the electrical resistance of the uninsulated cable, to increase the cable-permitting operating temperature at the maximum values of the transmitted current, which will substantially increase the efficiency of the overhead line.

3 cl, 1 dwg

Description

The invention relates to the field of electrical engineering, namely to uninsulated wires intended for transmission of electric energy through an overhead power line of overhead transmission lines of 35 kV and above.

A non-insulated wire for overhead power transmission lines is known, containing coils of steel aluminum-clad wires, the thickness of the clad aluminum layer on the surface of the steel wire is within 0.02 ÷ 0.5 mm (see the description of the invention to RF patent No. 2396617, IPC Н01В 5/04, published 08/10/2010).

A disadvantage of the known wire is: to obtain the required cross-sectional size of the aluminum wire, a significant increase in the number of wires in this wire design is necessary, which leads to an increase in its diameter and weight in relation to the currently known wires for overhead lines, which inevitably leads to an increase in load elements of supports, as a result of which it may be necessary to strengthen them, to install additional intermediate supports in overhead spans or to install new supports op.

Known wire power lines (see the description of the invention to the patent of the Russian Federation No. 2017245 C1, IPC НВВ 5/08, published July 30, 1994).

A wire with variable stiffness along the length contains a core in cross section made in the form of an ellipse, on top of which are laid the wires of an external coil. It should be noted the complexity of manufacturing the core, for the manufacture of which special equipment is required, and the round wire of the external winding does not increase the reliability of the overhead power lines in the mode of ice-wind loads.

A non-insulated wire is known, containing a steel core, over which a conductive wire of the arrow-shaped profile in cross section, made of aluminum or of thermostabilized aluminum-zirconium alloy, is laid in one or several concentric layers, (see utility model description to RF patent No. 97203 U1, IPC Н01В 5 / 10, published on August 27, 2010, Bulletin No. 24).

A laborious and complex method of manufacturing this wire, due to the fact that the manufacture of a conductive arrow-shaped wire requires special equipment and accessories. In addition, to ensure the reliability of the lock and the wire as a whole, made of conductive arrow-shaped wires in cross section, additional technological operations typical for the manufacture of a closed construction rope are necessary to external wind loads.

Known non-insulated aluminum wire twisted from aluminum wires or from wires of non-heat-treated aluminum alloy brand ABE. The wire is twisted in a multi-operational way, which consists in layer-by-layer production of wire. The wires between the layers intersect, forming a point contact between the layers. The number of layers varies from one to four (see Specifications GOST 839-80 “Uninsulated wires for overhead power lines).

The disadvantages of this known wire include the following:

- the wires in the wire made in such a multi-operational way are subject to significant wear due to crossing between the layers, as well as significant contact stresses.

- low tensile force, increased deflection arrow, which reduces the operational life of high-voltage lines, characteristic disadvantages for single lay wires of point contact, high labor costs in the manufacture of wires with point contact of wires.

The objective of the invention is to increase the technical characteristics of bare wire, such as an increase in breaking strength, an increase in the design cross section, a decrease in the electrical resistance of the wire, an increase in the allowable working temperature of the wire at maximum values of the transmitted current, which will significantly increase the efficiency of the overhead line.

The essence of the claimed invention is as follows. Uninsulated wire is made in three versions.

According to the first option.

An uninsulated wire containing a central wire, around which are sequentially a first layer of seven wires, a second layer with alternating seven wires of smaller diameter and seven wires of larger diameter and a third layer of fourteen wires. In this case, all wires are made of aluminum, the wire is made with the wires touching linearly with each other, with the same lay-up, in one direction, the outer surfaces of the wires are laid with gaps of 2-10% of the nominal diameter of the wires, are plastically deformed with a reduction ratio of 10-14% cross-sectional area.

According to the second option.

An uninsulated wire containing a central wire, around which are sequentially a first layer of seven wires, a second layer with alternating seven wires of smaller diameter and seven wires of larger diameter and a third layer of fourteen wires. In this case, all the wires are made of an alloy based on aluminum, including mass. %: aluminum - base, magnesium 0.45-0.6, silicon 0.45-0.6, iron 0.4-0.7, impurities - zinc ≤0.05, copper ≤0.05 the amount of titanium, vanadium , manganese, chromium ≤0.015. The wire is made with a linear contact of the wires with each other, with the same pitch of the lay layers, in one direction, the outer surfaces of the wires are laid with gaps of 2-10% of the nominal diameter of the wires, are plastically deformed with a reduction ratio of 10-14% of the cross-sectional area.

According to the third option.

An uninsulated wire containing a central wire, around which are sequentially a first layer of seven wires, a second layer with alternating seven wires of smaller diameter and seven wires of larger diameter and a third layer of fourteen wires. In this case, all the wires are made of heat-resistant alloy based on aluminum, including, mass. %: aluminum base, zirconium 0.23-0.27, iron 0.15-0.25, magnesium ≤0.02, silicon ≤0.08, zinc ≤0.04, copper ≤0.01 cadmium ≤0 .03, other ≤0.10. The wire is made with a linear contact of the wires with each other, with the same pitch of the lay layers, in one direction, the outer surfaces of the wires are laid with gaps of 2-10% of the nominal diameter of the wires, are plastically deformed with a reduction ratio of 10-14% of the cross-sectional area.

The invention is illustrated in the drawing, where in FIG. 1 shows a cross section of an uninsulated wire.

Uninsulated wire contains a central wire 1, the first layer 2 - seven wires of the same diameter, the second layer with alternating seven wires 3 of the same smaller diameter and seven wires 4 of the same larger diameter, the third layer 5 - fourteen wires of the same diameter.

The outer surfaces of the wires of the third layer are laid with gaps of 2-10% of the nominal diameter of the wires, are plastically deformed with a compression ratio of 10-14% of the cross-sectional area of an uninsulated wire.

The twisting of wires of all three layers of the wire is carried out in one technological operation. At the same time, the stitching pitch for all three layers of wires is kept constant, which eliminates the possibility of crossing the wires in separate layers and provides them with a linear touch when stitching.

The second technological operation is plastic deformation of the wire along the cross-sectional area of the wire with a compression ratio of 10-14% along the outer surface of the wires 5, which are laid with gaps of 2-10% of the nominal diameter of the wires.

Plastic deformation over the cross-sectional area of the wire helps to seal the strand, increase the filling of the calculated cross-section of the wire by increasing the initial diameter of the wire, eliminates the possible unevenness of the tension of the wires when laying the wire, and neutralizes the lay voltage. The resulting outer surface, which is smoother and more even than that of a wire made of round wires, can significantly reduce aerodynamic drag and wire dance.

This allows an uninsulated wire for all three wire options, to increase the breaking strength with respect to the uninsulated wires used by 20-30%, increase the design cross-section by 18-25%, reduce the electrical resistance of an uninsulated wire by 7-10%, additionally increase the third option allowing the operating temperature of the wire to 210 ° C at maximum values of the transmitted current, which will significantly increase the efficiency of the overhead line.

Claims (3)

1. Uninsulated wire containing a Central wire, around which are sequentially the first layer of seven wires, the second layer with alternating seven wires of smaller diameter and seven wires of larger diameter and a third layer of fourteen wires, while all wires are made of aluminum, the wire is made with a linear touch of the wires between each other, with the same pitch of the lay layers, in one direction, the outer surfaces of the wires are laid with gaps of 2-10% of the nominal diameter of the wires, plastically deformed s with a compression ratio of 10-14% of the cross-sectional area. 2. An uninsulated wire containing a central wire, around which a first layer of seven wires, a second layer with alternating seven wires of a smaller diameter and seven wires of a larger diameter and a third layer of fourteen wires, are arranged alternately, with all wires made of an aluminum-based alloy, including mass. %: aluminum - base, magnesium 0.45-0.6, silicon 0.45-0.6, iron 0.4-0.7, impurities - zinc ≤0.05, copper ≤0.05 the amount of titanium, vanadium , manganese, chromium ≤0.015, the wire is made with a linear contact of the wires with each other, with the same pitch of the layers in one direction, the outer surfaces of the wires are laid with gaps of 2-10% of the nominal diameter of the wires, are plastically deformed with a reduction ratio of 10-14% of the area cross section 3. An uninsulated wire containing a central wire, around which a first layer of seven wires, a second layer with alternating seven wires of smaller diameter and seven wires of larger diameter and a third layer of fourteen wires, are sequentially arranged, with all wires made of a heat-resistant aluminum-based alloy including mass. %: aluminum base, zirconium 0.23-0.27, iron 0.15-0.25, magnesium ≤0.02, silicon ≤0.08, zinc ≤0.04, copper ≤0.01 cadmium ≤0 , 03, other ≤0.10, the wire is made with the wires touching linearly with each other, with the same lay-up, in one direction, the outer surfaces of the wires are laid with gaps of 2-10% of the nominal diameter of the wires, are plastically deformed with a reduction ratio of 10-14 % cross-sectional area.

Images