Differential displacement and strain analysis of transmission line cables

作者：Rolim Adriana Lima^*; Moreira Jouberson L da R; Veloso Luis A C M; de Souza Remo Magalhaes; Araujo Jose Alexander

来源：Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2013, 35(3): 327-336.

DOI：10.1007/s40430-013-0026-x

• Aeolian vibration
• Transmission lines
• Fatigue
• Cables

This paper presents a strain analysis in transmission line cables caused by mechanical vibrations induced mainly by the wind action that can cause the fatigue rupture of the cable. The tests were performed on a test bench that consists of two spans of 9 and 12 m, respectively, and it was built using elements of transmission lines (suspension clamps, insulators, anchoring towers, etc.). The vibrations were generated by an electrodynamics shaker. Strains were measured by means of micro-electric strain gauges set in 04 wires of the cross-section of the cable at the vicinity of the suspension clamp, which presents severe levels of dynamic stresses. The cable bending amplitude was measured with two laser transducers. The bending amplitude was converted in strain with the Poffenberger-Swart equation. The comparison between the measured strain and that predicted theoretically showed RMS errors of 31 and 48 % for axial load levels of 20 and 30 % UTS, respectively.

• 出版日期2013-10