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A Comparison of Real-Time Thermal Rating Systems in the U.S. and the U.K.

Lookup NU author(s): Dr David Greenwood, Peter Davison, Dr Grant Ingram



This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2014.

For re-use rights please refer to the publisher's terms and conditions.


Real-time thermal rating is a smart-grid technology that allows the rating of electrical conductors to be increased based on local weather conditions. Overhead lines are conventionally given a conservative, constant seasonal rating based on seasonal and regional worst case scenarios rather than actual, say, local hourly weather predictions. This paper provides a report of two pioneering schemes—one in the U.S. and one in the U.K.—where real-time thermal ratings have been applied. Thereby, we demonstrate that observing the local weather conditions in real time leads to additional capacity and safer operation. Second, we critically compare both approaches and discuss their limitations. In doing so, we arrive at novel insights which will inform and improve future real-time thermal rating projects.

Publication metadata

Author(s): Greenwood DM, Gentle JP, Myers KS, Davison PJ, West IJ, Bush JW, Ingram GL, Troffaes MCM

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Power Delivery

Year: 2014

Volume: 29

Issue: 4

Pages: 1849-1858

Print publication date: 01/08/2014

Online publication date: 13/02/2014

Acceptance date: 22/12/2013

Date deposited: 25/07/2014

ISSN (print): 0885-8977

ISSN (electronic): 1937-4208

Publisher: IEEE


DOI: 10.1109/TPWRD.2014.2299068


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Funder referenceFunder name
Idaho National Laboratory
U.S. Department of Energy Wind Power Technology Office
Durham Energy Institute