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In the May issue of Modern Power Systems, Editor James Varley writes: "Real time ratings of overhead transmission lines - based on continuous monitoring of mechanical tension - tend to be higher than the static ratings that are conventionally used. Many lines are underutilized most of the time, creating opportunities for getting more out of the existing assets.
"Utilities' operating transmission systems measure just about everything under the sun," says Sandy Aivaliotis of The Valley Group (now owned by Nexans), but, remarkably, "they don't know the true capacity of their overhead transmission lines," which varies with changing weather conditions. This lack of information was implicated in the northern USA / Canada blackout of 14 August 2003.
Click here to read the Modern Power Systems Article May 2009
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