Abstract
This paper discusses the issue of shape and stress of overhead transmission lines. It fully considers that the conductor is subjected to axial force, shear, bending moment simultaneousiy. And the flat wire is basically in the elastic range. Because the stress is the strength of a certain point, the bending rigidity of the overhead lines can not be ignored. However, the catenary has been used in previous research and the force of the overhead lines is obtained on this basis. The author establishes a model of wire calculation under real condition, and gives a feasible simplified model. And then it gives the line shape formula, internal force formula, formula of stress in the strands. The results show that the original stress is significantly smaller.In this paper, the stress formula is almost close to the reality. It proves the reliability of the simplified model that the line shape includes the original flexible part.The results can not only fill the gaps in the theoretical study of the overhead lines, but also have some guidance to the production and design of overhead lines.
Highlights
The hypothesis has been adopted in the study of wire mechanics that line shape of overhead transmission line is catenary [1,2,3,4,5]
The conductor is only subjected to axial force, and the stress of the wire is replaced by the average stress
The purpose of this paper is to study the wire alignment under the natural suspended state, and the axial force, shear force and bending moment of the conductor under this condition
Summary
The hypothesis has been adopted in the study of wire mechanics that line shape of overhead transmission line is catenary [1,2,3,4,5]. The conductor is only subjected to axial force, and the stress of the wire is replaced by the average stress. The real wire is rigid and it is subjected to axial force, shear force and bending moment unlike a cable that is just under tension. The purpose of this paper is to study the wire alignment under the natural suspended state, and the axial force, shear force and bending moment of the conductor under this condition. The author obtains the line shape from the static equilibrium analysisθ and finds out the internal force of the wire and the stress of the strands.
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