What conductor is best for river crossings over 1000m?
For spans exceeding 1000 meters, ACCC (aluminum conductor composite core) or ACCR (aluminum conductor composite reinforced) are recommended due to their extremely low sag characteristics and high strength-to-weight ratio.
How does temperature affect sag in long spans?
Sag increases with temperature due to thermal expansion. ACSR shows 2-3% sag increase from 25°C to 75°C, while ACCC shows less than 1% change. This difference is critical for maintaining clearances in long-span applications.
What is the cost difference between standard and high-strength conductors?
ACSR/HS costs approximately 10% more than standard ACSR, while composite core conductors (ACCC/ACCR) cost 2-3 times more but offer superior sag performance for critical crossings.
How do I control vibration in long-span installations?
Install appropriate vibration dampers (Stockbridge type), ensure proper spacer placement for bundle conductors, and follow manufacturer guidelines for tension limits to minimize fatigue risk.
