Tensile test method for bent aluminium alloy overhead stranded conductor used for power grids

Abstract

A tensile test method for a bent aluminium alloy overhead stranded conductor used for power grids is disclosed. The aluminium alloy overhead stranded conductor used for the power grids cannot be processed into a dumbbell shape sample because the aluminium alloy overhead stranded conductor is small in diameter and uniform in thickness. In tensile tests, fracture frequently occurs at a clamping root. In addition, a wire taken down from the overhead stranded conductor is usually bended, so that the elongation percentage cannot be obtained. The tensile test method of the aluminium alloy overhead stranded conductor, a determination method of clamping force and a measuring method of the elongation percentage are disclosed, and a proper clamping force range of the aluminium alloy overhead stranded conductor is provided. The tensile test method is suitable for performing tensile tests of the aluminium alloy overhead stranded conductor on a device capable of adjusting the clamping force, can measure the elongation percentage of the stranded conductor, and provides good foundations for accurate evaluation of mechanical performance of the overhead stranded conductor.

Description

technical field [0001] The invention relates to the technical field of tensile test methods for aluminum alloys, in particular to a tensile test method for curved aluminum alloy overhead stranded wires for power grids. Background technique [0002] With the continuous development of overhead stranded wires for power grid transmission, aluminum alloy cored aluminum conductors and all aluminum alloy conductors have gradually replaced steel cored aluminum conductors due to their obvious energy-saving effects, and have been popularized and promoted in power line construction. The mechanical properties of these two energy-saving wires are also the prerequisites for the normal use of the wires, especially the tensile strength and elongation, so the correct evaluation of the tensile strength and elongation of the wires is particularly important. [0003] At present, the aluminum alloy energy-saving wires are all twisted from multiple monofilaments, and the diameter of the monofilam...

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art that the aluminum alloy wires are often broken at the root of the clamp in the tensile test and the true elongation cannot be obtained due to the bending of the sample, the present invention provides a tensioning method for aluminum alloy overhead stranded wires for power grids. Tensile test method, the present invention solves this problem, this method prevents the sample from breaking at the clamping root by selecting a suitable clamping force method, and provides a suitable range of clamping force and a determination method for elongation, which can obtain real resistance Tensile strength and elongation

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