SU1704170A1 - Electric wire - Google Patents

Abstract

The invention relates to power engineering, namely to overhead power lines. The aim of the invention is to reduce the active resistance to alternating current while simultaneously increasing the mechanical strength. The steel multiwire core is overlaid with aluminum wires that make up the conductive element. Additional poviv alloy wires containing. wt.%: magnesium 0.45-0.60; silicon 0.45-0.60; iron 0.40-0.70; aluminum the rest, have a third, counting from the outside. This reduces the resistance of the wire to the AC and simultaneously increases the mechanical strength of the electrical wire. 2 ill., 1 tab.

Description

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This invention relates to electric power industry, viz. overhead power lines.

The purpose of the invention is to reduce the active resistance to alternating current while simultaneously increasing the mechanical strength.

FIG. Figures 1 and 2 show cross sections of electrical wires with a different number of CONDITIONS of the conductive element.

The steel multiwire core 1 is covered by at least two layers of aluminum wires 2 and additional layers of wires 3 from an alloy containing wt.%: Magnesium 0.45-0.60; silicon 0.45-0.60. iron 0.40-0.70; the rest of the aluminum, while the specified winding is located third, counting from the outside.

The operation of the electrical wire can be illustrated by the example shown in FIG. 1. Full alternating current. flowing through the wire is distributed over the windings with different phases due to the intrinsic and mutual inductances of the leads.

At higher frequencies, the electromotive force (EMF) of mutual induction in the third layer, the direction of twist of which coincides with the direction of twist of the first, is opposite to the applied voltage and exceeds its value due to the component due to the full longitudinal flow in the steel core. Due to the lower conductivity of the third layer, compared with the wires of the first two layers, the current in it, directed towards full current, decreases, so the total current increases, which reduces the resistance of the wire as a whole to alternating current.

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At the same time, the mechanical strength of the wire is increased. The operation of the wire structure shown in FIG. 2, is similar to that considered.

The table shows the characteristics of the well-known wire AC-600/72 and the proposed wire, which differs from the well-known fact that in its third layer, instead of aluminum wires, wires are wound from an alloy with a conductivity 4 times lower than that of aluminum and with a tensile strength of 2 times higher, characteristics measured at 200 Hz.

Thus, the proposed wire with the same material consumption, weight and cost with the known wire AC-600/72 has, at 200 Hz, active resistance is 4% lower, and the breaking strength is 11% higher.

The technical advantages of the proposed steel-aluminum wire are that, while maintaining material intensity, weight and cost, it has reduced resistance and increased mechanical strength.

Claims (1)

Invention Formula Electrical wire containing a steel stranded core and Conductive element with cross section S, made in the form of at least two flashing aluminum wires with alternating direction of twisting, characterized in that, in order to reduce the active resistance to alternating current while increasing the mechanical strength, it contains an additional sheet of alloy wires containing, by weight, wt. %: magnesium 0.45-0.60: silicon 0.45-0.60; iron 0.40-0.70; the rest of the aluminum, while the specified winding is located third, counting from the outside. Fm.1 Phil. 2