Study on mechanical characteristics of conductors with three-dimensional finite-element models

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.

Numerical study of aeolian vibration characteristics and fatigue life estimation of transmission conductors

“…The mechanical properties of the steel wire, aluminum wire and the clamp are shown in Table 4 . Moreover, the elastoplastic behavior of the steel and aluminum wire is taken into account, and the stress–strain curves of the aluminium and steel wires obtained by experiments [ 33 ] are imported into the ABAQUS software.…”

“…The influence of the mean stress on the fatigue life of a conductor during aeolian vibration should be taken into account, and it can be introduced by the Goodman equation [ 23 ]: where σ eq is the equivalent amplitude of the alternating stress, σ b is the endurance limit, σ a the amplitude of alternating stress and σ m the mean stress. The endurance limit σ b of the aluminum wire of conductor JL/G1A-300/40 is 166 MPa according to our previous work [ 33 ]. Substituting the stress amplitudes of the conductors of the 8 cases into Eq ( 6 ), the equivalent stress amplitudes are obtained and shown in Fig 22(B) .…”

Numerical Simulation of the Dynamic Responses of Electric Power Fitting of Transmission Lines after Ice Shedding

“…If they are in a more extreme environment, the lower hanging point of the triangle hanging plate connected with the iced conductor may be destroyed first. e stress cloud picture in Figure 41 includes (4) parallel hanging plate 1, (8) parallel hanging plate 2, (5) PT adjusting plate 1, (6) PT adjusting plate 2, (7) traction plate, (9) ball-eye, (11) socket-clevis eye, (3) DB adjusting plate 1, and (17) DB adjusting plate 2. It is worth noticing that the ball-eye is prone to stress concentration at the corner of the straight rod.…”

“…Ji et al [9] proposed the ice-shedding failure model of transmission lines to predict the transient response of the transmission line system under impact load. Juraj et al [10] and Liu et al [11] analyzed the ice shedding of different conductors and studied the influence of conductor types and icing positions on overhead transmission lines. Shen et al [12] analyzed the dynamic response of the tower line coupling system under ice-shedding condition.…”