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This project ended in Jul 2018 and is now closed.Dismiss

Improved Statistical Ratings for Distribution Overhead Lines

Network operators
  • UK Power Networks
  • Northern Powergrid
  • Scottish & Southern Energy Networks
  • Western Power Distribution
  • Electricity North West Limited
  • Scottish and Southern Energy Power Distribution
Funding mechanismNetwork Innovation Allowance
DurationJul 2015 - Jul 2018
Project expenditure747,554
Research areaNetwork Operations, Comms & IT
  • August 2018

    All work being undertaken by EA Technology is now complete – the test rig at Stoke has been decommissioned. The collected data has been compiled and analysed…

Contact: Paul Jewell - Policy Manager; Sven Hoffman - Company Overhead Line Engineer

This project will use the test rig facility to gather 2 years of conductor and weather data. This data will be analysed to validate and update overhead line ratings, update existing tools and methodologies, and produce a software tool that will enable GB DNOs to further optimise regional or line specific ratings.


  • To monitor the weather conditions and co-incident temperatures of various conductors at various current levels in order to provide a new dataset for the assessment of the weather risk element of probabilistic ratings and to derive a methodology for quantifying this risk, in combination with load risks, in order to calculate line ratings.
  • To update ENA ER P27 and ENA ACE 104.
  • To validate the updated CIGRÉ methodology for calculating conductor temperature from load and weather data, allowing the possibility of future “desk top” re-runs of the project to cover different locations and time periods.
  • To update existing software tools, and to provide a new software tool to enable more comprehensive (regional or line specific) rating assessments to be made.
  • To engage with the Met Office to enable rapid provision of appropriate weather data sets.

Expected Benefits:

  • Sufficient data collection to build a robust model of overhead line ratings.
  • Analysis of that data to produce a model that enables more robust rating of overhead lines than the current model.
  • A new software tool to enable more comprehensive (regional or line specific) rating assessments to be made.
  • A robust, accurately informed revision of ENA ACE 104 and ENA ER P27.