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Assessment of seasonal static thermal ratings of overhead transmission conductors
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SYSNO ASEP 0379805 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Assessment of seasonal static thermal ratings of overhead transmission conductors Author(s) Heckenbergerová, Jana (UIVT-O)
Musílek, P. (CA)
Filimonenkov, K. (CA)Source Title Proceedings of IEEE Power and Energy Society General Meeting. - Piscataway : IEEE, 2011 - ISSN 1944-9925 - ISBN 978-1-4577-1001-8 Pages s. 1-8 Number of pages 8 s. Publication form Online - E Action PES 2011 Event date 24.07.2011-29.07.2011 VEvent location Detroit Country US - United States Event type WRD Language eng - English Country US - United States Keywords transmission line ; overhead conductor ; weather conditions ; thermal rating ; ampacity ; risk ; aging Subject RIV JE - Non-nuclear Energetics, Energy Consumption ; Use CEZ AV0Z10300504 - UIVT-O (2005-2011) UT WOS 000297469603058 EID SCOPUS 82855181014 DOI https://doi.org/10.1109/PES.2011.6039393 Annotation 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. Workplace Institute of Computer Science Contact Tereza Šírová, sirova@cs.cas.cz, Tel.: 266 053 800 Year of Publishing 2013
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