RU132241U1 - STEEL ALUMINUM WIRE FOR ELECTRIC TRANSMISSION AIRLINE - Google Patents

Abstract

1. Steel-aluminum wire for an overhead power line, in which a steel core is made of high-strength steel wires with a diameter of 1.50-4.50 mm each, galvanized, with simultaneous deformation with a compression ratio of the core cross-sectional area of 7-8.6%, cover steel the core with a layer thickness of 0.2-0.5 mm grease resistant to high temperatures, then twist aluminum wires with a diameter of 1.15-4.05 mm each, twist is performed with the same pitch in one direction and with a linear touch provo ok deform plastically outer surface of the upper helix wires at a reduction ratio of the cross-section 8-9 .2%. Steel-aluminum wire for an overhead power line, in which a steel core is made of high-strength steel wires with a diameter of 1.50-4.50 mm each, galvanized, with simultaneous deformation with a compression ratio of a core cross section of 7-8.6%, cover the steel core with a layer 0.2-0.5 mm thick grease resistant to high temperatures, then twist aluminum wires with a diameter of 1.15-4.05 mm each, each twist is produced in the opposite direction from the previous one, and the outer twist should It is necessary to have the right direction of the lay, each winding of aluminum wires is plastically deformed along the outer surfaces of the wires with a degree of compression of the cross-sectional area of the wire 8-9%.

Description

The invention relates to the field of electrical engineering, and in particular to a technology for manufacturing a steel-aluminum wire designed to transmit electrical energy through an overhead power line (VL) of 35 kV and above.

Known steel-aluminum wire, including the manufacture of a steel core from one central and six galvanized steel wires twisted around it with a diameter of 2.2 ÷ 3.6 mm each, applying an annular layer of extruded aluminum to the steel core on the press, cooling with water at a distance of at least 1.5 m from the zone of pressing aluminum and winding on the receiving drum of the finished wire. In this case, a finished wire of a smaller diameter is obtained by 23% compared to a wire obtained according to GOST 839-80 of a similar cross section (see the description of the invention to the RF patent No. 2351486; IPC B60M 1/13 published on 10.04.2009). The disadvantages of this wire are:

- the use of a steel core in a steel-aluminum wire in the form of a round carbon steel wire of low carbon, not thermally processed, of the second class, of increased accuracy according to GOST 3282 (this standard applies to round low carbon steel wire intended for the manufacture of nails, linking. fences and other purposes) does not contribute to the maintenance predetermined operational properties of the wire, due to the low temporary resistance to tearing of the wire, and the steel core as a whole;

- to improve the quality of aluminum overlay on steel wire, it is necessary to conduct special surface preparation; to eliminate irregularities on the surface of a round steel wire, the correct device must be additionally equipped with a calibrating die, which complicates the design.

A known construction of a steel multi-wire wire for overhead electric transmission lines is manufactured according to TU 14-4-661-91 (instead of TU 14-4-661-75). The wires, depending on the nominal cross-section, are twisted in various designs of galvanized steel wire.

The disadvantages of this wire are:

- low mechanical strength of the wire, the temporary tensile strength of 637-1080 n / mm ² . During long-term operation, a number of characteristic workloads act on the wire, such as wind, which causes vibration and galloping of the wire, which contributes to the appearance of fatigue changes in the steel structure. In addition, the deposition of ice on the wire increases the total mechanical tensile load;

- high specific electrical resistance of the wire to direct current, because Technical requirements GOST 3282-74 do not stipulate in the grades of steel used for the manufacture of wire in wires, the amount of impurities affecting electrical resistance;

- low surface density of the zinc coating of the wire, which reduces the corrosion resistance and electrical resistance of the wire as a whole, under the influence of corrosion and erosion of the environment on the material of the protective coatings.

- suboptimal working section of the conductor due to the large air gaps between the round wires in the structure, (reduces the tensile force and reduces the total electrical resistance of the wire as a whole).

Known three-lead wire for overhead power lines, contains a core, on top of which are located a wire with aluminum wires, at least one wire contains steel wires (see the description of the invention to patent SU No. 1791854, IPC H01B 5/04, 5/08, published on 30.01. 93. Bull. No. 4).

The disadvantages of the known three-drinkable wire are:

- the technological complexity of manufacturing a wire from a set of wires with a large difference in the mechanical properties of the wires;

- the use of three-drunk wires on overhead power lines with a steel wire to aluminum ratio of 1: 5 does not contribute to an increase in mechanical strength to the parameters of steel wires;

- the use of aluminum wires in the construction increases the cost of the wire;

- low technical resource due to the use in the design of point contact of round wires in a wire of type TK (twisting of coils in opposite directions);

- suboptimal working section of the conductor due to the large air gaps between the round wires in the structure, (reduces the tensile force and reduces the total electrical resistance of the wire as a whole).

A known method of manufacturing a wire, which consists in sequentially superimposing coils of wires on the core and plastic deformation of the product, the wires of the external coils are laid with gaps of 15-70% of the nominal diameter of the wires (see the description of the invention to the USSR copyright certificate No. 669415, IPC H01B 13/02, publication 06/28/1979).

The disadvantage of this method is the low conductivity of the wire, and it should also be noted that with such a wide range of 15-70%, the gap of the wires of the external wire, it will be necessary for each individual value of this gap to adjust the diameters of the wires when laying new wire diameters.

A known method of manufacturing a steel-aluminum wire, which includes the manufacture of a steel core from one central and six galvanized steel wires twisted around it with a diameter of 2.2 ÷ 3.6 mm each, coating the core with a layer of protective heat-resistant grease and manufacturing two coils of aluminum wires (see. Technical GOST 839-80 “Non-insulated wires for overhead power lines).

The disadvantages of this known method include the following:

- steel-aluminum wires have - non-optimal working section of the conductor due to the large air gaps between the round wires in the structure, (reduces tensile strength, increases the deflection arrow and reduces the total electrical resistance of the wire as a whole), which reduces the operational life of high-voltage lines.

A wire is known for overhead power lines containing coils of steel aluminum-clad wires, characterized in that the thickness of the clad aluminum layer on the surface of the steel wire is in the range (0.02 ÷ 0.5) mm in such a way that the wire has an electric current throughput of (0.8 ÷ 8) amperes per square millimeter of its cross section at the maximum allowable surface temperature of the wire, equal to 250 ° C. (see the description of the invention to the patent of the Russian Federation No. 2396617, IPC H01B 5/04, published on 08/10/2010).

A disadvantage of the known wire is:

- with the indicated thickness of the clad aluminum layer on the surface of the steel wire, in order 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 . With given sag arrows, wind and ice loads, increased loads are created on the support elements, for which existing supports may not be designed. Therefore, it may be necessary to strengthen them, to install additional intermediate supports in the spans of an overhead line, or to install new (replace existing) supports.

The objective of the claimed utility model is to create a steel-aluminum wire and use the resulting wire design to transmit and distribute electrical energy to a nominal voltage of 35 kV and above with a nominal frequency of 50 Hz.

The essence of the claimed utility model is as follows.

According to the first option.

Steel-aluminum wire for an overhead power line, in which a steel core is made of high-strength steel wires with a diameter of 1.50 ÷ 4.50 mm each, galvanized, with simultaneous deformation with a compression ratio of the core cross-sectional area of 7 ÷ 8.6%, cover the steel core with a layer with a thickness of 0.2 ÷ 0.5 mm grease resistant to high temperatures, then perform twisting of aluminum wires, with a diameter of 1.15 ÷ 4.05 mm each, twigs are performed with the same pitch, in one direction and with a linear touch prov olive, plastically deform the outer surfaces of the wires of the upper layer with the degree of compression of the cross-sectional area of the wire 8 ÷ 9%.

According to the second option.

Steel-aluminum wire for an overhead power line, in which a steel core is made of high-strength steel wires with a diameter of 1.50 ÷ 4.50 mm each, galvanized, with simultaneous deformation with a compression ratio of the core cross-sectional area of 7 ÷ 8.6%, cover the steel core with a layer a thickness of 0.2 ÷ 0.5 mm grease resistant to high temperatures, then perform twisting of aluminum wires with a diameter of 1.15 ÷ 4.05 mm each, each twist is produced in the opposite direction from the previous one, and the outer twist for Must have the right direction of lay, each winding of aluminum wires is plastically deformed along the outer surfaces of the wires with a degree of compression of the cross section of the wire 8 ÷ 9%.

The invention is illustrated by drawings, where:

figure 1 shows a wire made in the first embodiment,

figure 2 shows a wire made in the second embodiment.

The following notation is used in the figures:

1 - a Central wire with a diameter of d ₁ ;

2 - wire with a diameter of d _{2 the} first midwife;

3 - wire with a diameter of d _{3 the} second midwife;

4 - a wire with a diameter of d _{4 of the} second coil;

5 - wire with a diameter of d _{5 of the} third layer.

According to the first option.

Steel-aluminum wire contains: one central wire with a diameter of d ₁ ; seven wires with a diameter of d ₂ in the first layer; seven wires of diameter d _{3 of the} second coil; seven wires with a diameter of d _{4 of the} second coil; fourteen wires of diameter d _{5 of the} third layer.

According to the second option.

Steel-aluminum wire contains: one central wire with a diameter of d ₁ ; seven wires with a diameter of d ₂ in the first layer; seven wires of diameter d _{3 of the} second coil; seven wires with a diameter of d _{4 of the} second coil; fourteen wires of diameter d ₅ in the third layer.

This allows you to use the newly developed steel-aluminum wire for the transmission and distribution of electrical energy to a rated voltage of 35 kV and above, with a nominal frequency of 50 Hz, to increase the efficiency of overhead lines by increasing the amount of electricity transmitted per unit time and increasing the mechanical strength of the wire or with the same amount of electricity transmitted reduce the diameter of the wire as a whole, thereby reducing material and financial costs when performing overhead line projects in areas with difficult geographic and weather conditions, to carry out reconstruction projects of power transmission lines with a higher level of environmental safety.

Plastic deformation of aluminum wires contributes, by increasing the fill factor of the working cross section, to an increase in the useful conductive cross section of the wire, and the resulting outer surface is smoother and more even than that of wires made of round wires, it allows to reduce the load from climatic influences, significantly reduce aerodynamic drag and dance of wires.

Claims (2)

1. Steel-aluminum wire for an overhead power line, in which a steel core is made of high-strength steel wires with a diameter of 1.50-4.50 mm each, galvanized, with simultaneous deformation with a compression ratio of the core cross-sectional area of 7-8.6%, cover steel the core with a layer thickness of 0.2-0.5 mm grease resistant to high temperatures, then twist aluminum wires with a diameter of 1.15-4.05 mm each, twist is performed with the same pitch in one direction and with a linear touch provo ok deform plastically outer surface of the upper helix wires at a reduction ratio of the cross-section of 8-9%. 2. Steel-aluminum wire for overhead power transmission line, in which a steel core is made of high-strength steel wires with a diameter of 1.50-4.50 mm each, galvanized, with simultaneous deformation with a compression ratio of the core cross-sectional area of 7-8.6%, cover steel the core with a layer thickness of 0.2-0.5 mm grease resistant to high temperatures, then twist aluminum wires with a diameter of 1.15-4.05 mm each, each twist is produced in the opposite direction from the previous one, and the outer twist to women have right direction of lay of each coils of aluminum wires deformed plastically at outer surfaces of the wires at a reduction ratio of the cross-section of 8-9%.

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