RU222462U1 - Bare reinforced wire for overhead transmission lines - Google Patents

Abstract

The utility model relates to cable technology. The technical result is to increase the strength of the steel core of the wire. The wire contains the main part of several successive layers superimposed on a core twisted from wires; the wires are made of a steel alloy based on iron, carbon, manganese and silicon with the introduction of vanadium as an additional alloying element with a content of at least 0.003%. 2 salary f-ly, 1 ill.

Description

Technical field

The utility model relates to cable technology, namely to products for high-voltage overhead power lines (hereinafter referred to as power lines) with bare conductors intended for transmitting electrical energy.

State of the art

Known, selected as a prototype, is a non-insulated wire for overhead power lines, containing a main aluminum conductive part of several successive layers superimposed on a core twisted from wires (patent No. 119514, published 08/20/2012).

In the prototype, the guaranteed tensile strength of the core wires is limited to 1900 N/mm ² . This reduces the reliability of the power line.

Disclosure of the essence of the utility model

The claimed technical result consists of increasing the strength of the steel core of a bare wire and a corresponding increase in the reliability of the power transmission line.

The technical result is achieved by the fact that a non-insulated wire for overhead power lines contains a main current-carrying part consisting of several successive layers superimposed on a core twisted from wires made of a steel alloy based on iron, carbon, manganese and silicon with the introduction of vanadium as an additional alloying agent. element with a content of at least 0.003%.

The utility model has been developed.

The main conductive part of the wire can be made of electrical pure aluminum. This provides a maximum reduction in losses and makes it possible to increase the load on overhead power lines.

The main conductive part of the wire can be made of aluminum alloyed with zirconium. This increases the strength characteristics of the wire for power lines.

Another development of the utility model is that a corrosion-resistant coating of zinc and aluminum can be applied to the steel core wires.

The utility model, taking into account its development, is illustrated by a drawing showing a cross-section of the wire.

The figure shows:

1 - the main aluminum conductive part of several (for example, two) layers;

2 - core wires made of steel alloy;

3 - corrosion-resistant coating of wires 2.

The conductive part 1 can be made of pure aluminum or an alloy of aluminum and zirconium.

Coating 3 can be made of zinc and aluminum. The steel alloy of wire 2 is made on the basis of iron, carbon, manganese and silicon with the introduction of vanadium as an additional alloying element with a content of at least 0.003%.

A series of experiments confirmed an increase in the ultimate strength (tensile strength under tensile load) of wire 2 to a value of at least 2000 N/mm ² (versus 1900 N/mm ² in the prototype). The result was obtained for wire 2 of different diameters (2.1 mm, 2.65 mm, 2.8 mm) under conditions of changing its relative elongation in the range of 3.2-6.0% when introducing vanadium into a steel alloy containing 0.003-0.006 %. Increasing the percentage of vanadium further increases the ultimate strength of wire 2, but at the cost of increasing the cost of wire for power lines.

When manufacturing a wire according to the claimed utility model, first a reinforced core of wires 2 with increased ultimate tensile strength is twisted using a cigar-twisting machine. The wires 2 can first be hot coated with a coating 3 of zinc and aluminum. Then, on top of the core, using a cage twisting machine, the main aluminum conductive part is formed from several layers. The result is a reinforced wire for power lines that can withstand increased destructive load due to the increased tensile strength of core wires 2.

An example of wire parameters for power lines according to the claimed utility model.

The cross-section of the aluminum part is 300 mm ² , the cross-section of the steel core is 48 mm ² . The breaking load of the wire is 150.2 KN (versus 144.6 KN for the prototype wire).

Thus, the implementation of the claimed wire for power lines from an aluminum conductive part in the form of several successive layers and a reinforced core, the wires of which are made of a steel alloy based on iron, carbon, manganese and silicon with the introduction of vanadium as an additional alloying element with a content of at least 0.003% , allows you to increase the strength of the core, thanks to the greater (compared to the values in the prototype) ultimate tensile strength of the core wire, accordingly, increase the resistance of the wire to destructive loads and, therefore, ensure the achievement of the stated technical result - increasing the reliability of the overhead power line.

Claims (4)

1. Non-insulated wire for overhead power lines, containing a main aluminum current-conducting part of several successive layers superimposed on a core twisted from wires, characterized in that the core wires are made of a steel alloy based on iron, carbon, manganese and silicon with the introduction of vanadium into as an additional alloying element with a content of at least 0.003%. 2. Non-insulated wire for overhead power lines according to claim 1, characterized in that its main conductive part is made of electrical pure aluminum. 3. Non-insulated wire for overhead power lines according to claim 1, characterized in that its main conductive part is made of aluminum alloyed with zirconium. 4. Non-insulated wire for overhead power lines according to claim 1, characterized in that a corrosion-resistant coating of zinc and aluminum is applied to the core wires.