Abstract
Refined three-dimensional (3D) finite-element (FE) models of typical aluminium conductor steel reinforced (ACSR) and formed aluminium conductor steel reinforced (FACSR) with structural details to simulate their static and dynamic characteristics are proposed. Taking into account the elastoplastic behaviour of the aluminium wires, the tensile mechanical properties and coupling between tension and torsion of the two types of conductors under tensile loading are numerically investigated. Furthermore, dynamic responses of two transmission lines, in which the refined 3D segment models and equivalent beam models of the two types of conductors are used, after ice-shedding are numerically simulated and the dynamic characteristics of the conductors are analysed. Finally, based on the numerical simulation results, the fatigue lives of the aluminium wires are estimated and the wear between the wires is discussed. It is revealed that taking into account the structural details of the conductors in the strength design of transmission lines is necessary, and the mechanical characteristics of FACSR are better than those of the ACSR in both static and dynamic situations.
Highlights
Transmission conductors are key components in the power grid and their safety is very important for the normal operation of the power supply system
The conductors of aluminium conductor steel reinforced (ACSR) are widely used, and a new type of conductors known as formed aluminium conductor steel reinforced (FACSR) are obtaining more and more application in China
Using the mixed models, in which the transmission conductors are discretized with refined 3D models and equivalent beam models, the dynamic responses of these d0 j=1 j=2 j=3 axial direction of the helical structural strand p (Di – di) li b expansion of a single wire in ith layer transmission conductors after ice-shedding are in turn analysed, based on which the fatigue lives of the aluminium wires are estimated and wear between the wires of the two conductors are discussed
Summary
Transmission conductors are key components in the power grid and their safety is very important for the normal operation of the power supply system. By means of the FE model discretized with beam elements, Lalonde et al [20,21] analysed the strain and stress amplitude at critical regions of a conductor-clamp system under cycle bending loads, studied the dynamic bending characteristics and estimated the fatigue lives of the conductors. There are some numerical and experimental works on tension variation in conductors during vibration, such as dynamic responses of transmission lines after ice-shedding [23,24,25], dynamic swing of transmission lines under steady and stochastic wind [26] and galloping of iced transmission lines [27] In these researches the conductors are equivalent to uniform cables without considering the effects of the stranded details of the conductors on their stress, strength, fatigue and wear. The obtained results may provide instructions and foundations for the strength design and type selection of conductors in transmission lines
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