Modified values for geometric factor of external thermal resistance of cables in duct banks

The authors previously described a technique for calculating the geometric factor G/sub b/ for extended ranges of the height/width ratio of the duct bank or backfill that enabled the Neher-McGrath method to be applied to a wider range of cable configurations. However, the technique was based on the...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on power delivery 1988-10, Vol.3 (4), p.1303-1309
Main Authors: El-Kady, M.A., Anders, G.A., Motlis, J., Horrocks, D.J.
Format: Article
Language:English
Subjects:
Applied sciences
Cables
Ducts
Earth
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Finite element methods
Heat transfer
Isothermal processes
Power networks and lines
Surface resistance
Temperature
Thermal factors
Thermal resistance
Underground and submarine networks
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The authors previously described a technique for calculating the geometric factor G/sub b/ for extended ranges of the height/width ratio of the duct bank or backfill that enabled the Neher-McGrath method to be applied to a wider range of cable configurations. However, the technique was based on the assumption that the duct bank surface represents an isothermal boundary, which can result in some errors in the derived G/sub b/-values. A finite-element-based technique is described for calculating modified values of G/sub b/ on the basis of the actual heat-transfer mechanism (constant total heat flux) around the duct bank surface. The technique was applied to several cable configurations, yielding more accurate values.< >
ISSN:0885-8977
1937-4208
DOI:10.1109/61.193924