Improving Short-Circuit Current Capacity, Resistance, and Breaking Load of OPGW Constructions by Modifying Aluminium Alloy With AlB₂

Abstract

This article presents a method that can be applied to molten AA-6101 alloy to improve electrical properties of the aluminium part of the optical ground wire (OPGW) used in overhead transmission lines to protect phase conductors from lightning strike and to transmit signals and data. AA-6101 alloy in casting of the log as 6 m length and 178 mm diameter for extrusion has been inoculated by AlB 2 to decrease detrimental effects of Cr, Ti, V, and Zr on the conductivity of the material. After inoculation, improved billets were extruded as 9.5 mm diameter feedstock. Required wires drawn from the feedstock according to the construction types of OPGW to be tested were exposed to aging at 175 C, 6 h (T-8). Upon completion of the back-twist and performing-type stranding process, resistance, and short-circuit current capacity and breaking load of the OPGW 88/44 constructions with other metal combinations have been examined and tested to show improvement. Results are summarized in tables and graphically.

Casting of Recycled Aluminum Cans to Electrical Conductivity Tape Production

“…For other applications or even to further improve the ability to conduct electricity, it is recommended to carry out studies with recycled aluminum using as reference 6xxx series alloys, such as alloy 6101, used in the manufacture of electrical conductors and overhead cables in electrical networks performed according to Karabay and others authors [29][30][31][32][33][34][35].…”

Enhancement on Al–Mg–Si alloys against failure due to lightning arc occurred in energy transmission lines

“…In theoretical calculation Eqs. (2) and (3) were used. Then short circuit capacity and resistance of the construction types manufactured from the improved material under AlB 2 effect is indicated in the same Fig.…”

“…Particularly, those lines passing through areas where winter lightning with big energy frequently occurs or areas total days on which lightning occurs, is comparatively high require upgraded lightning resistance overhead ground wires to increase reliability of the power transmission systems [2][3][4][5][6]. Two types of OPGW are available at present [7].…”

Experimental analysis of the strands breaking characteristics of optical fibre composite overhead ground wire due to simulating lightning strike

“…Some researchers have been studying the phenomenon of a lightning strike to OPGW [8][9][10][11][12][13]. Yokoya et al [6] developed excellent lightning-resistant GW/OPGW applicable for conventional transmission lines based on the results of various investigations.…”