RU171205U1 - Bearing reinforced cable of the contact network of the railway - Google Patents

Abstract

The utility model relates to the field of electrical engineering, namely, to the construction of multilayer and multi-wire carrier reinforced cables used to transmit electrical energy in overhead electric networks and high-speed lines of electrified transport, for example, railway. Bearing reinforced cable of the railway contact network, containing a central high-strength steel copper-coated wire, a first layer of four copper wires and three high-strength steel copper-coated wires of the same diameter, a second layer with alternating seven copper wires of one smaller diameter and seven copper wires of one larger diameter and a third layer of fourteen copper wires of the same diameter. Moreover, all three layers are made in one technological operation, with the same lay step, in one direction and with a linear touch of the wires of the first, second and third layer. The outer surfaces of the wires of the third layer are plastically deformed with a degree of compression of the cross-sectional area of the cable 10-12%. This allows you to reduce the electrical resistivity of the reinforced cable, relative to the carrier cable made of bronze round wires Br2 by 35-40%, and increase its breaking strength by 8-12%. The resulting outer surface is smoother and more even than that of a support cable made of round wires, which allows to reduce the load from climatic influences and significantly reduce the aerodynamic resistance and vibration of the wires.

Description

The utility model relates to the field of electrical engineering, namely to the construction of multi-layer and multi-wire carrier cables used for the transmission of electrical energy in overhead electric networks and high-speed lines of electrified transport, for example, railway.

Known Electric wire (options), (see the description of the invention to patent RU 2179348 C2, НВВ 5/08; НВВ 7/28, published 02/10/2002). The wire consists of turns of an outer coil made of copper wire, a central core, inner threads, and the core and inner coil are made of steel wire with at least one protective layer of nickel and / or chromium and / or copper. Or the wire consists of turns of an outer coil, made of copper wire, a central core and inner scrolls made of galvanized steel wire. The outer coil wire is made with at least one protective layer of nickel and / or chromium. The wires of all coils are directed in the opposite direction.

The well-known design of a multi-wire wire used as a contact wire support cable, in which the central core of the inner coil turns (six round wires) is used to increase mechanical strength, all wires are made of steel wire (St. 40-80) with a protective coating of at least from one layer of nickel and / or chromium and / or copper. This technical solution involves increasing the electrical conductivity of the outer coil, made of twelve copper wires.

The disadvantages of the wires of this design, which corresponds to the ropes with a point contact wires, it is necessary to include an extremely low technical resource. The wires undergo significant wear due to crossing between the layers, as well as significant contact stresses, which will inevitably lead to a violation of the protective coating and, as a consequence, a decrease in the corrosion resistance of the wire as a whole. The contact points of the wires between the layers are stress concentrators, which leads to an increase in local stress values not only when bending, but also when the rope is stretched. Over time, due to the effect of the described effect, the point contact wire rope can lose stability and plastically deform even in the region of elastic deformations.

The round shape of the external winding wires contributes to the deterioration of the aerodynamic properties associated with increased adhesion of snow, the formation of ice, increase the weight of the wire.

This technical solution reduces the electrical conductivity of the wire, since for given wire diameters of 10.70; 12.60; 14.00; 15.80 mm, used as a cable for the contact network of the railway, the use of steel round wires reduces the cross-section of conductive copper wires.

Known Interstate Standard GOST 32697-2014. Rail contact network cables. This standard applies to bearing cables made of copper and its alloys intended for contact suspension of the railway. Cables are classified by materials:

copper - M;

bronze, conditional group Br1; Br2.

A cable made of an alloy based on copper Br2, with respect to a cable made of copper, has a breaking strength higher by about 40%, but the electrical resistivity is higher by about 52%.

The disadvantages of a cable made of a bronze alloy with increased mechanical strength include the high cost of manufacture and increased electrical resistance with respect to a cable made of copper.

The objective of the claimed utility model is the creation of a supporting reinforced cable of the contact network of the railway with increased breaking strength and reduced electrical resistance, relative to the supporting cable of the contact network made of bronze alloy Br2, currently used on high-speed railway lines.

The essence of the claimed utility model is as follows.

Bearing reinforced cable of the railway contact network, containing a central high-strength steel copper-coated wire, a first layer of four copper wires and three high-strength steel copper-coated wires of the same diameter, a second layer with alternating seven copper wires of one smaller diameter and seven copper wires of one larger diameter and a third layer of fourteen copper wires of the same diameter. Moreover, all three layers are made in one technological operation, with the same lay step, in one direction and with a linear touch of the wires of the first, second and third layer. The outer surfaces of the wires of the third layer are plastically deformed with a degree of compression of the cross-sectional area of the cable 10-12%.

In the proposed technical solution, an increase in the breaking strength of the load-bearing reinforced cable is achieved by a new design in which the central high-strength steel copper-coated wire is made with a temporary tensile strength of at least 1770 n / mm ² , and three high-strength steel copper-coated wires, in the first layer, are made with a temporary tensile strength, not less than 1960 n / mm ² , the manufacturing technology of copper wire and the bearing reinforced cable as a whole. The decrease in electrical resistance is ensured by the use of plastically deformed copper wires with a large cross section and lower electrical resistivity.

The essence of the utility model is illustrated by the drawing, where in Fig.1 shows a cross section of a bearing reinforced cable.

In the drawing, the following notation:

1 - central high-strength steel copper-plated wire;

2 - three high-strength steel copper-plated wires of the same diameter in the first layer;

3 - four copper wires of the same diameter in the first layer;

4 - the second layer with the alternation of seven wires of one smaller diameter;

5 - the second layer with the alternation of seven wires of one larger diameter;

6 - the third layer of fourteen copper wires of the same diameter.

The outer surfaces of the wires of the third layer carrying the reinforced cable are plastically deformed with a compression ratio of the cross-sectional area of the bearing reinforced cable of 10-12%.

The manufacturing technology of the supporting reinforced cable is as follows.

The twisting of wires of all three layers of the bearing reinforced cable is carried out in one technological operation. At the same time, the lay-up step for all three layers of wires is kept constant, which eliminates the possibility of crossing wires, which is observed when twisting a cable with a point-to-point touch of wires, on individual layers and provide them with a linear touch when twisting an reinforced cable.

The second technological operation is plastic deformation along the cross-sectional area of the bearing reinforced cable with a compression ratio of 10-12%, on the outer surface of the wires.

Plastic deformation over the cross-sectional area of the load-bearing reinforced cable contributes to an increase in the fill of the calculated copper highly conducting cross-section of the load-bearing reinforced cable by increasing the initial diameters of the copper wire, which allows, despite the use of four high-strength copper-plated steel wires, to reduce the total electrical resistance of the reinforced cable, in relation to to the carrier cable made of bronze round wires Br2 by 35-40% and increase its breaking strength by 8-12%

The resulting outer surface is smoother and more even than that of a support cable made of round wires, which allows to reduce the load from climatic influences and significantly reduce the aerodynamic resistance and vibration of the wires.

Claims (1)

The supporting reinforced cable of the railway contact network, containing a central high-strength steel copper-coated wire, a first layer of four copper wires and three high-strength steel copper-coated wires of the same diameter, a second layer with alternating seven copper wires of one smaller diameter and seven copper wires of one larger diameter and a third layer of fourteen copper wires of the same diameter, while the wires of the third layer are plastically deformed with a compression ratio of the cross-sectional area of the cable 10-12%.

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