NDLI: Theoretical model for temperature gradients within bare overhead conductors

Content Provider	IEEE Xplore Digital Library
Author	Black, W.Z. Collins, S.S. Hall, J.F.
Copyright Year	1986
Abstract	A thermal model is described which can be used to calculate the temperature distribution within an energized, stranded overhead conductor. It has been shown that for typical conductor constructions energized to current levels which produce conductor temperatures less than 100 degrees C and for reasonable weather conditions, the maximum temperature difference that exists in stranded conductors is less than 10 degrees C. If conditions reach such a state that birdcaging in the conductor occurs, then temperature differences within the conductor greater than 10 degrees C can result. However, birdcaging will only occur in conductors for which the supporting strands have a coefficient of thermal expansion is greater than that of the conducting strands (ACSR, for example) and only at elevated temperatures, usually well above 100 degrees C. Finally, the results show that ampacity models based on the assumption of an isothermal conductor will provide accurate predictions of a conductor temperature that are between the center and surface temperatures. A few general conclusions are drawn about the influence of temperature gradients on conductor sags.<>
Sponsorship	IEEE Power Engineering Society
Starting Page	707
Ending Page	715
Page Count	9
File Size	730186
File Format	PDF
ISSN	08858977
Volume Number	3
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Conductors Conducting materials Thermal conductivity Composite materials Inorganic materials Differential equations Thermal resistance Turbines Engines
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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