ACSS bare conductors are primarily used in high-temperature overhead transmission lines, especially in regions with high ambient temperatures and long spans requiring superior mechanical strength. They excel in high-capacity power corridors and both urban and suburban distribution networks. These conductors are particularly valuable in areas subject to ice loading and high wind conditions, as well as in retrofit projects where increased capacity is needed without modifying existing towers.
ACSS conductors consist of a high-strength galvanized steel core (single or stranded) wrapped with fully annealed 1350-O aluminum wires in concentric layers. This specific design enables operation at temperatures up to 250°C with minimal sag, as the steel core bears mechanical loads while the annealed aluminum maintains conductivity at high temperatures. This construction results in reduced sag compared to conventional ACSR conductors when operating at elevated temperatures, helping maintain necessary clearance requirements under heavy load conditions. Additionally, the construction provides self-damping characteristics that help reduce vibration during service.