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

Greenwood, David M.; Gentle, Jake P.; Myers, Kurt S.; Davison, Peter J.; West, Isaac J.; Bush, Jason W.; Ingram, Grant L.; Troffaes, Matthias C.M.

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David M. Greenwood

Jake P. Gentle

Kurt S. Myers

Peter J. Davison

Isaac J. West

Jason W. Bush


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 United States of America and one in the United Kingdom—in which 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. Secondly, 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.


Greenwood, D. M., Gentle, J. P., Myers, K. S., Davison, P. J., West, I. J., Bush, J. W., …Troffaes, M. C. (2014). A Comparison of Real Time Thermal Rating Systems in the U.S. and the UK. IEEE Transactions on Power Delivery, 29(4), 1849-1858.

Journal Article Type Article
Publication Date Aug 1, 2014
Deposit Date Jan 10, 2014
Publicly Available Date Jan 10, 2014
Journal IEEE Transactions on Power Delivery
Print ISSN 0885-8977
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 29
Issue 4
Pages 1849-1858
Keywords Power transmission, Fluid Dynamics, Power system planning.


Accepted Journal Article (905 Kb)

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