TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Research upon Contact Area between Wires in the Structure of Overhead High Voltage Transmission Line
(Cercetări asupra zonei de contact dintre firele din componenţa conductoarelor de înaltă tensiune)
Vol LXVII • No. 2/2015
Daniel Achiriloaiei, Cristian-Sorin Neş, Ion Dumitru
Universitatea “Politehnica” din Timişoara, Bd. Mihai Viteazu nr.1, Timişoara e-mail: daniel.achiriloaiei@yahoo.com

 Keywords   conductor, wire, contact, tensile test, imprint, fretting

 Abstract
Electricity transmission from source to consumers is achieved through overhead power lines. Under the influence of weather conditions, additional stress is generated and may lead to accelerated deterioration and premature breakage. The analysis of stress and strain at wire level has a decisive role in identifying areas with peak loads and in network lifetime evaluation. The mechanical properties of the conductor may change with the emergence and development of contact imprints. In order to understand how an imprint develops and how it influences the properties of the conductor, imprint and tensile tests were done on wires taken from a steel-aluminum conductor. Theoretical and experimental researches have shown that the shape and size of imprints occurring at the contact points between wires have a significant influence on the tensile strength of the conductors. Additionally, local deformations can lead to the initiation and propagation of fretting fatigue cracks.

 Rezumat
Transportul energiei electrice de la sursă catre consumatori se realizează prin intermediul liniilor aeriene de înaltă tensiune. Sub acţiunea factorilor meteorologici, la nivelul conductoarelor apar solicitări suplimentare care duc la deteriorarea accelerată şi ruperea prematură. Analiza stării de tensiune şi deformaţie a firelor din componenţa conductoarelor are rol decisiv în vederea identificarii zonelor cu solicitari maxime, monitorizării retelei şi evaluării duratei de viaţă.
Modificarea proprietaţilor mecanice ale conductorului se face odată cu apariţia si evoluţia amprentelor de contact. Pentru a înţelege modul cum evoluează o amprentă şi a efectelor pe care aceasta le are, s-au realizat teste de amprentare şi tracţiune pe fire prelevate dintr-un conductor bimetalic oţel-aluminiu. Cercetarile teoretice si experimentale au evidenţiat că forma şi dimensiunile amprentelor care apar la contactul firelor au o influenţă deosebită asupra rezistenţei la rupere a conductoarelor şi că deformatiile locale determină anumite particularităţi ale iniţierii şi propagării fisurilor la oboseală cu fretting.



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