Transmission line length, operating condition and rating regime

Uprating of transmission lines by means of HTLS conductors for a sustainable growth: Challenges, opportunities, and research needs

“…The power transfer capability of short overhead lines (< 80 km) is mainly limited by the conductors' thermal rating. For longer lines (< 300 km) the voltage drop limits the power transfer capability, whereas for lines over 300 km, steady-state stability becomes a critical factor [75].…”