ACSR (Aluminum Conductor Steel Reinforced) is a widely used overhead conductor consisting of concentrically stranded aluminum wires on a galvanized steel core. The aluminum strands provide excellent conductivity, while the steel core adds mechanical strength and durability. ACSR conductors are ideal for medium and high voltage transmission and distribution systems where long spans, high tension, and mechanical reliability are required.
Application
Overhead power transmission and distribution lines
Primary and secondary distribution circuits
Messenger support for aerial cable installations
Ideal for river crossings, valleys, and other long-span installations
Frequently used in rural electrification and grid expansion projects
Key Features
✅ High Strength-to-Weight Ratio: Suitable for long spans and high mechanical loads
✅ Excellent Electrical Conductivity: Aluminum 1350-H19 strands provide efficient current carrying capacity
✅ Rugged Construction: Galvanized steel core ensures superior tensile strength and corrosion resistance
✅ Low Sag Performance: Enables tighter tensioning and reduced line sag
✅ Cost Effective: Combines performance and economy for utility-scale installations
✅ Proven Performance: Complies with DIN 48204 and other international standards for overhead conductors
Construction Details
ACSR is a composite concentric-lay stranded conductor made up of:
Central Core: One or more galvanized steel wires (can be single or stranded – e.g., 1, 7, 19, or 37 wires)
Outer Layers: One or more layers of hard-drawn aluminum wires (Al 1350-H19) helically stranded over the steel core
| Component | Material |
|---|---|
| Conductor | Aluminum 1350-H19 |
| Core | Galvanized steel (Class A/B/C zinc coating) |
| Stranding Options | 6Al/1St, 12Al/7St, etc., per DIN 48204 |
| Direction of Lay | Right-hand or left-hand, per specification |
acsr conductor construction
Manufacturing Standard
DIN 48204 – German standard for ACSR conductors
Also available to IEC 61089, ASTM B232, BS 215-2, or other custom standards upon request
Technical Advantages
Longer spans with fewer towers
Higher mechanical strength for adverse weather conditions
Good corrosion resistance in standard environments (can be enhanced with zinc/aluminum alloy-coated steel)
Widely accepted and installed by utilities, contractors, and EPCs globally