ACSR steel core aluminum stranded wire galvanized steel core aluminum clad steel core large-span overhead transmission line high-strength tensile aluminum alloy conductor

Steel cored aluminum stranded wire is a composite overhead conductor composed of a steel core and an outer layer of aluminum stranded wire, widely used in high-voltage and ultra high voltage transmission lines. The core advantage of steel cored aluminum stranded wire is that the steel core provides extremely high tensile strength, enabling it to withstand extreme mechanical loads such as large spans, heavy ice areas, and strong wind areas; At the same time, the outer aluminum stranded wire ensures good conductivity, achieving long-distance and high-efficiency power transmission. Steel cored aluminum stranded wire can be subdivided into various types such as ordinary galvanized steel core (ACSR), aluminum clad steel core (ACSR/GA), and aluminum alloy reinforced type (ACSR/AW) to adapt to different corrosion environments and mechanical requirements. Steel cored aluminum stranded wire is almost the only feasible option for overhead conductors when crossing rivers, canyons, railways, or designing long spans. The long-term allowable working temperature of the conductor of steel cored aluminum stranded wire can reach 75 ℃ to 100 ℃, and can be even higher under special design; The maximum temperature during a short circuit (up to 5 seconds) shall not exceed 200 ℃. Steel cored aluminum stranded wire also has good fatigue resistance and low creep characteristics, and can maintain long-term stability under periodic loads. In engineering, different grades of steel cores (ordinary, high-strength, extra strong) and aluminum/steel section ratios can be selected according to actual needs to optimize the balance between transmission capacity and tower costs. This wire is widely used in high-voltage overhead transmission lines ranging from 35kV to 750kV and above, large span projects, cross river and river transmission, mountainous and heavy ice area lines, and other scenarios.

The models of steel cored aluminum stranded wire include ACSR (ordinary galvanized steel core), ACSR/GA (aluminum clad steel core), and ACSR/AW (aluminum alloy reinforced type), with rated voltage suitable for high-voltage overhead transmission lines ranging from 35kV to 750kV and above. The conductor adopts a steel core aluminum stranded wire structure, which is composed of aluminum wire and steel wire twisted together. The nominal cross-sectional specifications range from 10/2 mm ² to 500/65 mm ². The aluminum steel structure can be selected in various combination forms such as 6+1, 12+7, 24+7, 26+7, 30+7, 54+7, etc. The steel core material can be selected from ordinary galvanized steel, aluminum clad steel, or high-strength aluminum alloy, and the aluminum wire layer is made of hard aluminum or aluminum alloy. The maximum long-term operating temperature of the conductor is 75 ℃ to 100 ℃ (depending on the type of steel core and wire grade), and the maximum temperature during a short circuit (lasting for up to 5 seconds) does not exceed 200 ℃. The tensile strength is divided into three levels based on the steel core grade: ordinary, high strength, and extra strong. At 20 ℃, the conductivity of the conductor can reach 61% IACS (standard type) or higher. The line density is lower than that of pure aluminum wire, and the advantage is more obvious with longer spans. The product complies with standards such as IEC 61089, ASTM B232, GB/T 1179, and is suitable for scenarios such as large-span power transmission, mountainous lines, river and valley crossings, heavy ice areas, coastal strong wind areas, and ultra-high voltage backbone power grids. It has core advantages such as high strength, good conductivity, excellent sag characteristics, and corrosion resistance (aluminum clad steel type).