Layered stress calculation method of steel-cored aluminum stranded wire under thermo-mechanical coupling effect

Abstract

The invention relates to a layered stress calculation method of a steel-cored aluminum stranded wire under a thermo-mechanical coupling effect. The method comprises the following steps of: calculating to obtain the average running tension of a conductor at a solved temperature; substituting the average operation tension of the conductor at the temperature into an axial total strain calculation expression to obtain the axial total strain of the conductor and the strand direction strain of stranded wires; removing the temperature strain from the strand direction strain of the stranded wires to obtain the strand direction strain of the stranded wires under the action of tension; solving the axial strain of the stranded wires under the action of tension; acquiring the axial stratification stress of the stranded wires by multiplying the axial strain of the stranded wires under the action of tension by the elastic modulus of each layer of stranded wires; and calculating the layered stress of the wire steel core and the aluminum stranded wires under the extreme weather condition, and judging whether the conductor meets the safety design and the anti-fatigue performance under the extreme weather condition. According to the layered stress calculation method, layered stress calculation expressions of stranded wires of different materials are obtained through theoretical derivation, layered stress values of all layers can be obtained through programming calculation, and important reference is provided for safety design and selection of overhead lines and anti-fatigue performance research.

Description

technical field [0001] The invention relates to the technical field of design and calculation of overhead conductors, in particular to a method for calculating the delamination stress of aluminum-steel conductors under the action of thermal-mechanical coupling. Background technique [0002] With the increase of electricity demand and the large-scale construction of transmission lines, the stress of conductors under different weather conditions is an important indicator for the design and maintenance of overhead conductors. In order to ensure the safe operation of transmission lines, it is necessary to control the stress of conductors within the design range. In actual operation, under the joint action of tension and temperature, the cross-sectional stress of the ACSR will have obvious delamination effect. In the existing projects, the construction and design calculations are carried out according to the average stress, ignoring the influence of the different properties of th...

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Problems solved by technology

[0004] It can be seen that there are many researches at home and abroad on the distribution of delamination stress of conductors under tension, but there are relatively few studies on the distribution of delamination stress of conductors under the combined action of temperature and tension.

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