NDLI: Rating methods for cables installed in unventilated and partially ventilated surface troughs

Content Provider	IEEE Xplore Digital Library
Author	Pilgrim, J.A. Swaffield, D.J. Lewin, P.L. Payne, D.
Copyright Year	2011
Description	Author affiliation: Electricity Network Investment, National Grid, Warwick, UK (Payne, D.) \|\| Tony Davies High Voltage Laboratory, University of Southampton, Southampton, UK (Pilgrim, J.A.; Swaffield, D.J.; Lewin, P.L.)
Abstract	Cables installed in surface troughs are a critical part of many transmission circuits. This paper presents a method for calculating the rating of such circuits using computational fluid dynamics techniques, applied to two common trough designs. One design has solid concrete lids while for the second some lids are replaced by grilles to encourage natural air circulation. For the case of covered troughs with solid concrete lids, the IEC 60287 method was found to be conservative owing to its failure to consider the thermal impact of the ground. Good agreement was observed between the CFD model and an improved analytical formulation by Anders. Modeling of partially ventilated troughs, which at present cannot be rated analytically, shows continuous rating increases of up to 31% over the covered design owing to greater air circulation.
Starting Page	74
Ending Page	78
File Size	1299166
Page Count	5
File Format	PDF
ISBN	9781457702785
e-ISBN	9781457702792
e-ISBN	9781457702778
DOI	10.1109/EIC.2011.5996119
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atmospheric modeling Computational fluid dynamics Mathematical model IEC standards Analytical models Conductors Temperature natural convection computational fluid dynamics cable rating ampacity
Content Type	Text
Resource Type	Article

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