Dynamic Line Rating

Dynamic line rating, also called real-time thermal rating, is an approach to operating electric transmission lines that adjusts how much load a line may carry based on actual, continuously monitored environmental conditions rather than a fixed worst-case assumption. Conventional transmission lines are rated statically for the worst combination of heat, low wind and sunlight a line is expected to face, which leaves capacity unused most of the time. A dynamic line rating system instead measures conditions such as wind speed, air temperature, current load and solar radiation in real time and calculates the line's true safe operating limit at that moment, letting utilities draw on the margin between the static rating and the true limit when conditions allow. This lets grid operators manage congestion, integrate more renewable generation, defer costly new transmission infrastructure, and improve economic dispatch during contingencies, without adding physical capacity to the line itself. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/