Aluminum Alloy Stranded Wires are a key overhead variant of aluminum alloy power cables, widely applied to overhead power lines of 1kV and above. They are extensively adopted in urban and rural distribution networks, rural grid upgrades, and power transmission for industrial parks, with targeted applicability to diverse engineering scenarios.
As an overhead configuration of aluminum alloy cables, Aluminum Alloy Stranded Wires are suitable for urban areas with narrow line corridors. They support line capacity expansion without replacing transmission towers, effectively reducing tower loads and lowering overall renovation costs. Medium-strength all-aluminum alloy stranded wires are ideal for urban overhead lines with limited space and frequent routine maintenance needs.
Lightweight and high in tensile strength, Aluminum Alloy Stranded Wires adapt to long-distance overhead laying in mountains, hills, and other complex terrains, reducing wiring difficulty and logistics costs. High-strength models offer tensile strength twice that of pure aluminum conductors and feature low-sag performance, making them perfectly suited for large-span transmission projects across rivers and valleys.
Featuring no steel core structure, Aluminum Alloy Stranded Wires avoid bimetallic electrochemical corrosion. They perform exceptionally well in coastal zones and highly corrosive industrial areas, with a service life more than 50% longer than that of conventional ACSR conductors.
Heat-resistant Aluminum Alloy Stranded Wires act as high-current busbars in substations and power plants, capable of temporarily carrying extra loop current to facilitate emergency repairs and daily maintenance. Steel-cored aluminum alloy stranded wires balance mechanical strength and electrical conductivity, making them suitable for heavy-load overhead lines with high structural strength requirements. Other overhead aluminum alloy cable variants are also applicable to electrified railway catenaries, lightning wires for communication towers, and other special power transmission scenarios.
The advantages of Aluminum Alloy Stranded Wires are consistent with the inherent properties of aluminum alloy cables:
The specific gravity of Aluminum Alloy Stranded Wires is only one-third that of copper. Under the same tensile load, they are around 30% lighter than ACSR conductors, cutting down transportation and construction workload. High-strength types achieve 1.8–2 times the tensile strength of pure aluminum conductors, with an elongation rate of up to 30% and higher flexibility than copper cables. Their minimum bending radius is merely 7 times the conductor diameter, greatly boosting construction efficiency.
Aluminum Alloy Stranded Wires deliver stable conductivity. Under the same breaking load, higher conductivity can be achieved by increasing the conductor cross-sectional area. The steel-core-free design eliminates hysteresis loss and eddy current loss, leading to lower resistance and line loss at the same current-carrying capacity, thus saving considerable electricity costs in long-term operation.
Magnesium, silicon, rare earth, and other alloying elements are added to the raw material, greatly enhancing corrosion resistance and effectively preventing electrochemical corrosion. Their service life reaches 100–120 years, far longer than the 50-year service life of ordinary ACSR conductors, and sharply reduces full-life-cycle maintenance costs.
Benefiting from sufficient raw material supply, aluminum alloy cables (including Aluminum Alloy Stranded Wires) cost only 1/2 to 2/3 as much as copper cables. They can lower project investment by over 30% while satisfying equivalent performance requirements. The steel-core-free all-aluminum alloy structure simplifies design, saves raw materials, and reduces costs of matching towers and line fittings.
Available in all-aluminum alloy and steel-cored aluminum alloy types, they fit different load requirements and service environments. Their thermal expansion coefficient is close to that of copper, ensuring good matching performance with copper-aluminum connectors and preventing loose connection risks, thus maintaining safe and stable power transmission.
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