DocumentCode
1396647
Title
Calculation of the internal thermal resistance and ampacity of 3-core unscreened cables with fillers
Author
Anders, G.J. ; Napieralski, A.K.T. ; Zamojski, W.
Author_Institution
Ontario Hydro, Toronto, Ont., Canada
Volume
13
Issue
3
fYear
1998
fDate
7/1/1998 12:00:00 AM
Firstpage
699
Lastpage
705
Abstract
The equations given in IEC 287 and in the Neher-McGarth paper for the internal thermal resistance of 3-core cables were developed for paper insulated cables. For such cables, it was assumed that the insulation and filler materials have the same thermal resistivities. In reality, in 3-core cables a variety of materials are used as fillers. The majority of these will have a higher thermal resistivity than the insulation. In this paper, a new formula is developed to compute the value of this thermal resistance taking into account the thermal resistivity of the filler. The effect of filler resistivity on cable ampacity is also discussed
Keywords
paper; power cable insulation; thermal conductivity; thermal resistance; 3-core unscreened cables; IEC 287; cable ampacity; cable fillers; internal thermal resistance; paper insulated cables; thermal resistivity; Belts; Cable insulation; Conducting materials; Conductivity; Conductors; Equations; IEC standards; Polyethylene; Samarium; Thermal resistance;
fLanguage
English
Journal_Title
Power Delivery, IEEE Transactions on
Publisher
ieee
ISSN
0885-8977
Type
jour
DOI
10.1109/61.686962
Filename
686962
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