Overhead line ratings

Statistical ratings for distribution overhead lines were published nearly 30 years ago and are now considered out of date. These ratings take no account of regional differences in climate, nor of any changes in climate that may have occurred over the last 30 years. This means that load-related decisions to replace or reinforce lines are currently based on inaccurate ratings. Changing demands on networks and the predicted future climate change are increasing the pressure to maximise overhead line capacity. Led by Western Power Distribution, this project will deliver a cost-effective, up-to-date and robust methodology for calculating and optimising overhead line ratings at regional and line-specific levels for today and the future.

Timescales: July 2015 – December 2017.