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Ambient temperature corrected dynamic transmission line ratings at two PG&E locations

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3 Author(s)
Steeley, W.J. ; Pacific Gas & Electr. Co., San Ramon, CA, USA ; Norris, B.L. ; Deb, A.K.

An offline ambient temperature corrected transmission line (T/L) dynamic thermal rating system is being developed at PG&E (Pacific Gas and Electric) to provide T/L ratings 1 to 24 hours ahead based on hourly ambient temperature measurements at a given location. A low minimum 2 ft/s constant wind speed is assumed at all times. Solar radiation is calculated by an analytical solar model assuming clear sky conditions. The IEEE/ANSI ampacity standard is used to calculate T/L ampacity. In the ambient corrected DTR (dynamic thermal rating) system, a stochastic/deterministic model forecasts ambient temperatures. The forecasts and the standard deviations of forecast errors are updated every hour. T/L ratings were evaluated at PG&E locations and gains of up to 34% over the static line ratings were possible at both locations by the proposed DTR system. The benefits and the risk of the ambient corrected DTR system have been quantified

Published in:

Power Delivery, IEEE Transactions on  (Volume:6 ,  Issue: 3 )

Date of Publication:

Jul 1991

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