NDLI: Assessment of seasonal static thermal ratings of overhead transmission conductors

Content Provider	IEEE Xplore Digital Library
Author	Heckenbergerova, J. Musilek, P. Filimonenkov, K.
Copyright Year	2011
Description	Author affiliation: Department of Electrical and Computer Engineering, University of Alberta, Edmonton AB, Canada (Heckenbergerova, J.; Musilek, P.; Filimonenkov, K.)
Abstract	Deterministic static thermal ratings of overhead transmission lines are usually conservative, causing underutilization of their potential capacity. Efforts to overcome this limitation led to the development of alternative rating strategies, based on probabilistic and dynamic methods. One such strategy is the seasonal static thermal rating. It uses a probabilistic rating approach with explicit treatment of seasonal effects on conductor temperature. In this paper, we present several variants of seasonal ratings, and analyze their performance with respect to other rating approaches. Seasonal ratings use a set of predetermined probabilistic ratings that are engaged according to the season of year or time of day. By alternating among several ratings, transmission lines can be operated closer to their actual ampacity. In addition, seasonal ratings can reduce the risk of thermal overload, compared to the uniform probabilistic rating which remains constant at all times. Despite the risk reduction, and counter to the common belief, they still pose a significant risk of conductor thermal overload. Characteristics of several seasonal rating strategies are illustrated using a case study involving a power transmission line in Newfoundland, Canada. Simulation results show that seasonal ratings can provide a modest increase in transmission line throughput, compared to the basic probabilistic rating. However, they also confirm the high levels of residual risk.
Starting Page	1
Ending Page	8
File Size	7209721
Page Count	8
File Format	PDF
ISBN	9781457710001
ISSN	19449925
e-ISBN	9781457710025
e-ISBN	9781457710018
DOI	10.1109/PES.2011.6039393
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductors Power transmission lines Probabilistic logic Wind speed Thermal conductivity Safety Aging Transmission line Overhead conductor Weather conditions Thermal rating Ampacity Risk
Content Type	Text
Resource Type	Article

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