Experimental Study of the Fatigue Performance of Overhead Pure Aluminium Cables

Characteristics of Wires of the Long-Operated Aluminum-Steel Cable at Different Places on an Overhead Power Line Span

“…In the literature, stranded all-aluminum cables are referred to as all-aluminum alloy conductors (AAACs) [4,7,8,[20][21][22][23][24][25][26][27] or, separately, all-aluminum conductors (AACs) if all of the wires in the cable are made of high-purity aluminum or aluminum conductor alloy-reinforced (ACAR) if the wires are made of technical-grade aluminum [28]. Stranded steel-aluminum cables are called aluminum conductors (or cable or clad) steel-reinforced (ACSR) [4][5][6][7]11,12,14,15,26,[29][30][31][32][33][34].…”

“…Earlier, to investigate the processes occurring during the operation of cables, cables were studied not only immediately after operation in OPLs [5,11,12,14,15,[24][25][26]30,34] but also after fatigue tests [6,16,[20][21][22][23][27][28][29][31][32][33]35,36], which simulated "aging" of wires (changes in microstructural, structural, and other properties) under real operating conditions or after heat treatment [8][9][10]. Both AAAC [6,8,16,[20][21][22][23][24][25][26][27][28]36] and ACSR [5,6,11,12,14,15,26,[29][30]…”

“…A wide range of experimental methods were used for research, such as optical microscopy (OM) [5,11,12,14,15,[20][21][22][23]25,27,29,30], scanning electron microscopy (SEM) [5,11,12,14,15,[20][21][22][23]27,30,32], energy-dispersive X-ray microanalysis (EDX, also energydispersive X-ray spectroscopy in some articles, abbreviated as EDS) [5,11,14,20,24,25,27,30], X-ray diffraction (XRD) [14,15,[24][25][26][27], electron backscatter diffraction (EBSD) [24][25][26][27]34], densitometry [24][25][26][27]34], the acoustic-resonance ...…”

“…For instance, the effect of both tensile mechanical stress [20,21,28,29] and the amplitude of displacements at bending [6,[21][22][23]28,29,31,35] were investigated, as well as that of annealing temperature [8,9] and mechanical defects of Al wires during their production [7], effect of clamp material [23,31], elemental composition of Al wires [6,22], presence of a steel core [6,26], corrosion due to exposure to ambient air during operation in power lines [5,14,15,30], forest fires [10], and the environment during fatigue tests (either room atmosphere or NaCl solution) [32]. Changes in the microstructure, structure, chemical composition, and physical properties of wires from cables were also studied after their operation in OPLs for various service lives ranging from 8 to 62 years [5,11,12,14,15,[24][25][26]30,34] and after fatigue testing [27,36].…”

“…In the papers [5,[24][25][26], where cable wires were studied after operation in OPLs, and in most of the papers devoted to the results of fatigue tests [6,16,20,22,28,32,33,36] and to the studies of various physical properties of the wires after fatigue tests [27,35,36], the positions of the wires in the cable cross-section or along the cable length were not fixed.…”