RU2553977C1 - Nanocomposite wire - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: at a core (1) made of a steel wire layers of current-conducting wires of two types are wound - aluminium wire (2) and nanocomposite wire (3). The layers of wire (3) are alternated with the layers of wire (2). The layer of wire (3) is wound to the core (1). The wire (3) is formed of a wire stock (wire rod) produced of a nanocomposite material based on aluminium with a nanoparticle filler made as multilayer carbon nanotubes and reinforced in the process of multiple cold drawing of the wire stock up to the preset diameter.

EFFECT: increased capacity, mechanical strength and resistivity to sagging without an increase in its weight.

2 cl, 1 dwg

Description

Technical field

The invention relates to the electric power industry and can be used in stranded wires for overhead power lines. State of the art

Known wire containing a supporting core coated with a layer of metallic conductive material of high conductivity. The core is made of a composite material with a synthetic resin matrix modified with carbon nanoclusters of the fulleroid type (fullerenes, and / or nanotubes, and / or astral) [patent RU No. 23 87035]. The core coating is made of a highly conductive metal material (copper, and / or aluminum, or steel, or their alloys with other metals).

This does not simultaneously optimize the mechanical and electrical characteristics of the wire, since the mechanical characteristics of the wire are determined by the properties of the supporting core, and the coating is only involved in ensuring the bandwidth of the wire.

Known electrical wire made of aluminum alloy (patent RU No. 2422223, IPC B21C 1/00, 2010), which contains the core and the surrounding surface layer of increased micro-continuity, obtained by drawing wire blanks, the strength and conductivity of which is greater than that of the core. The aluminum alloy of which the wire is made contains (in wt.%): Iron 0.5-0.7; silicon 0.2-0.4; cerium, lanthanum, praseodymium in the amount of 6.0-10.0; impurities 0.1-0.3; the rest is aluminum.

The disadvantage of this solution is the need to use special materials (expensive rare-earth elements) in the aluminum alloy of which the wire is made, as well as the reduced strength of the inner areas (core) of the wire.

Known selected as a prototype "Wire for power lines" according to patent RU No. 2063080. The wire contains a steel core and several conductive coils of aluminum wires. The core is made of non-magnetic nitrogen-containing austenitic steel with low magnetic permeability and increased strength. Aluminum coils are made of wires of various diameters (the largest is the diameter of the wires of the outer coils) and provide high current throughput of the wire.

The disadvantage of the prototype is that the mechanical load on the wire is perceived almost exclusively by the steel core, as a result of which the mechanical strength of the wire and its resistance to sagging under long-term exposure to mechanical load are reduced.

Disclosure of the invention

The subject of the invention is a wire for a power line comprising a steel core and aluminum wire strands alternating with aluminum nanowire wire strands filled with multilayer carbon nanotubes reinforced with multiple cold drawing to a predetermined diameter.

This allows you to increase the mechanical strength and resistance to sagging wires without increasing its mass and reducing current throughput.

The invention has a clarifying development, consisting in the fact that a coil of nanocomposite wire is wound on a steel core. The implementation of the invention in view of its development

The figure illustrates the claimed construction of a wire with a core 1 of steel wire, on which coils of two types of conductive wires are wound - aluminum wire 2 and nanocomposite wire 3. Coils of wire 2 alternate layer by layer with coils of wire 3. A core of coils 1 is wound from coils of wire 3.

The wire 3 is formed from a wire billet (wire rod) obtained from a nanocomposite material consisting of a base (aluminum) and a filler in the form of multilayer carbon nanotubes (nanoparticles). The use of an aluminum base provides high conductivity to the material, and a filler of nanoparticles (multilayer carbon nanotubes) provides increased mechanical strength.

In the process of multiple cold drawing of a wire billet (i.e. successive cold drawing of wire rod through a series of dies with a decreasing hole diameter), the nanocomposite wire is hardened due to intense plastic deformation, which increases the degree of interaction between the base and the filler.

In the manufacture of wires on a steel core in alternating layers wound coils of conductive wires 3 and 2.

The increased mechanical strength of the wire of the claimed design is achieved due to the fact that the mechanical load on the wire is perceived not only by its steel core 1, but also by the meanings of the conductive nanocomposite wire 3.

It was experimentally established that layer-by-layer alternation of coils of nanocomposite wire 3 with coils of aluminum wire 2 provides the optimal combination of mechanical strength and resistance to sagging wires with high current throughput.

An example of a specific implementation of the inventive wire. The wire, the design of which is shown in the figure, has a core 1 of steel wire with a temporary tensile strength of 1400 MPa and coils of conductive wires 3 and 2, arranged in alternating layers around core 1. In this example, the first layer (closest to core 1) form 6 nanocomposite wires 3, the second layer - 12 aluminum wires 2, the third layer - 18 nanocomposite wires 3. For wires 3, the indicator of temporary tensile strength is 150 MPa.

The electrical resistance of the wire to DC at 20 ° C is 0.1179 Ohm / km. The mass of the wire is 756 kg / km. The breaking force for such a wire is 73513 N, which is 53% higher than the corresponding indicator for the steel-aluminum wire of the corresponding mass.

Claims (2)

1. A wire for a power line comprising a steel core and coils of aluminum wire, alternating with coils of nanocomposite aluminum-based wire with a filler of multilayer carbon nanotubes, hardened by multiple cold drawing to a predetermined diameter. 2. The wire according to claim 1, in which a coil of nanocomposite wire is wound around a steel core.