With an increased focus on renewable power generation, dynamic line rating is being investigated as a way to connect the new intermittent generation to the grid without needing to build additional infrastructure. The number of transmission lines available for dynamic line rating depends on the length of each transmission line. The St. Clair curve is typically used by industry to determine the length of transmission lines that are thermally rated. This paper will extend this curve by including reactive power in the calculations. This paper will also demonstrate the effect that changing the capacity of the line due to dynamic line rating has on the length of transmission line that is thermally rated.
['Leanne Dawson', 'Andrew M. Knight']
Transmission line length, operating condition and rating regime