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Comparison of Structural, Microstructural, Elastic, and Microplastic Properties of the AAAC (A50) and ACSR (AC50/8) Cables after Various Operation Periods in Power Transmission Lines
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This study compared the structural and mechanical properties of aluminum cables used in overhead power transmission lines after different periods of operation. Both all-aluminum alloy and aluminum-steel reinforced cable types were tested for hardness, elastic modulus, and microstructural changes with age. Understanding cable degradation is important for maintaining safe and reliable electrical infrastructure.
In modern economic infrastructure, Al cables of overhead power transmission lines are used both without and with a steel core (respectively, all aluminum alloy conductor (AAAC) and aluminum conductor steel reinforced (ACSR) cables). In this article, the changes in structural, microstructural, and elastic-microplastic properties have been analyzed for the outer wires of the AAAC (A50) and ACSR cables (AC50/8 cables with a steel core of ~8 mm2 cross-section, hereinafter referred to as AC50) with the cross-section of the stranded conductor of ~50 mm2, which were in operation for 0–20 years in the Volgograd region of Russia. Using the techniques of X-ray diffraction, electron backscattered diffraction, densitometry, and the acoustic method, the structural and microstructural features of the wires have been compared and found to be correlated with their elastic-microplastic properties. It has been ascertained that the presence of a steel core in AC50 leads to a decrease in the defectiveness of the near-surface layer of their aluminum wires. Compared with A50 cables, the development of void defects in the near-surface layer of Al-wires of AC50 cables slows down (by ~1 year with a service life of ~10 years and by ~3 years with a service life of ~20 years).
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Structural, Microstructural, Elastic, and Microplastic Properties of Aluminum Wires (from AAAC (A50) Cables) after Fatigue Tests
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Researchers characterized the structural, microstructural, elastic, and microplastic deformation properties of aluminum wires from AAAC (A50) overhead power line cables after laboratory fatigue testing, using X-ray diffraction, electron backscatter diffraction, densitometry, and acoustic methods to identify degradation patterns relevant to predicting cable lifespan.
Characteristics of Wires of the Long-Operated Aluminum-Steel Cable at Different Places on an Overhead Power Line Span
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This materials science paper examines the structural and mechanical properties of aluminum-steel cable wires from long-operated power lines. This is an engineering paper with no direct relevance to microplastics or environmental health.
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Structural and microstructural changes in aluminum wires from overhead power transmission lines of 0 to 62 years service life were characterized using X-ray diffraction and electron backscatter diffraction, finding progressive work hardening and grain boundary changes that affect wire strength and longevity.
The Structure of the Near-Surface Layer of the AAAC Overhead Power Line Wires after Operation and Its Effect on Their Elastic, Microplastic, and Electroresistance Properties
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Researchers investigated the near-surface defect layers of All Aluminum Alloy Conductor overhead power line wires after 0 to 62 years of operation using X-ray diffraction, electron backscattering diffraction, optical microscopy, and resistivity measurements. They found two characteristic layer thicknesses of approximately 30 to 50 µm and 56 to 140 µm, with near-surface layer thickness increasing at a rate of approximately 4 µm per year over the first 18 years of service.
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