Abstract
Increased thermal ratings of transmission lines are important for
operators of transmission lines. While scientific knowledge of
thermal phenomena has advanced substantially in the past two
decades, little has been done to improve the understanding of the
practical effects of the most important factors for practical transmission
engineers.
This report studies the impact of various factors on line rating by
investigating their effect on the sag of a typical transmission line
span. The report shows that the effects of many commonly considered
factors are smaller than practical error margins, while some
omitted factors have much more substantial practical significance.
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