Why is steel-cored aluminum stranded wire the preferred choice for high-voltage and long-distance power transmission?

ACSR Conductor (ACSR) remains the optimal choice for long-distance overhead transmission lines, primarily due to its unique structural design, which achieves a perfect balance between mechanical strength, electrical efficiency, and economic cost.

What are the advantages of the ACSR structure?

1. The outer aluminum layer of ACSR possesses excellent conductivity, is lightweight, and low-cost, primarily responsible for transmitting electrical energy; the inner steel core has extremely high tensile strength, acting as a mechanical reinforcement component to bear the entire mechanical load and tension of the conductor.
2. The vast majority of the current is transmitted through the outer aluminum core, which has good conductivity, while very little current is carried in the inner steel core, which has poor conductivity. Therefore, the presence of the steel core not only does not reduce the overall conductivity of the conductor but also significantly improves its mechanical strength without compromising current carrying capacity.
3. Thanks to its high-strength steel core, ACSR can cross complex terrains such as rivers, canyons, and remote mountainous areas with fewer tower supports, effectively reducing land occupation and engineering costs. Meanwhile, it exhibits exceptional resistance to wind vibration and galloping under severe weather conditions such as strong winds and icing, maintaining stable tension and reducing sag.
4. The steel core maintains structural stability even at high temperatures, making the conductor less prone to deformation during temperature cycles and reducing the risk of sag. Furthermore, the excellent heat dissipation and low resistance of aluminum wire result in minimal voltage drop during long-distance transmission, effectively reducing energy loss.

Why is the market demand for steel-cored aluminum conductors higher than that for aluminum alloy conductors?

Aluminum alloy stranded wire is made of multiple strands of aluminum alloy wire twisted together. They have poor mechanical strength and tensile strength, and are extremely unstable when facing complex terrains for long-distance power transmission.

ACSR Conductor, through scientific structural design and material combination, meets the requirements of long-distance, high-capacity, and high-safety power transmission while keeping construction and maintenance costs within a reasonable range, thus becoming an indispensable mainstream choice in modern power infrastructure.