
What are the most common conductor materials used in overhead transmission lines, and why?
2025-08-12The most common conductor materials are ACSR (Aluminum Conductor Steel Reinforced) and AAAC (All Aluminum Alloy Conductor).
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ACSR: This conductor features a central steel core for high tensile strength, which allows for longer spans between towers and greater resistance to mechanical stress from wind and ice. The outer aluminum strands provide excellent electrical conductivity. This combination makes ACSR a popular choice for long-distance, high-voltage transmission lines.
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AAAC: Made from a heat-treatable aluminum-magnesium-silicon alloy, AAAC conductors offer high strength-to-weight ratio and superior corrosion resistance. While they have lower tensile strength than ACSR, their lighter weight and good conductivity make them ideal for medium-span, high-current applications.
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