AAAC bare conductors are primarily employed in medium to high voltage distribution and transmission lines where corrosion resistance is a priority. These conductors excel in coastal regions, industrial areas with chemical contamination, and environments with high pollution levels. AAAC provides an optimal balance of electrical performance and mechanical strength without steel reinforcement, making it suitable for moderate span lengths with enhanced corrosion resistance requirements.
AAAC conductors consist entirely of high-strength aluminum alloy wires (typically 6201-T81 or 6101-T81) arranged in concentric layers. The aluminum alloy composition provides improved tensile strength compared to pure aluminum while maintaining good conductivity (approximately 52.5% IACS). This homogeneous construction eliminates bi-metallic corrosion concerns and offers a standard operating temperature of 90°C, with lighter weight than comparable ACSR conductors of equivalent strength.
The basic composition of this alloy pertains to the Aluminium-Magnesium-Silicon group, which is also known in Europe as Almelec or Aldrey and after their drawing they must undergo a thermal treatment at a temperature of approximately 1965° C.
Properties
As regards aluminium, the wires of this alloy have a double tensile strength (greater than 30 Kg/mm2), its electrical conductivity is 15% lower (53% instead of 61%) and the weight is the same.