Thermal analysis of cables in unfilled troughs: Investigation of the IEC standard and a methodical approach for cable rating

Matthew Terracciano, Sujit Purushothaman, Francisco De León, Alireza Vashghani Farahani

Research output: Contribution to journalArticle

Abstract

A robust algorithm, based on relaxation, is proposed for the implementation of the IEC Standard method for rating cables installed in unfilled troughs. Through hundreds of finite-element simulations, the validity range of the standardized equations is established. Studies are performed by varying the following parameters over a wide range: trough size, ambient air temperature, trough aspect ratio, position of cables, cable operating temperature, and intensity of solar radiation. A physically consistent analog thermal-electric equivalent circuit is proposed for the thermal rating of cables installed in unfilled troughs. In contrast with the standards, the equivalent circuit offers a methodological approach that considers all heat-transfer phenomena involved in cables in troughs, for example, the conduction of heat through the cable layers, the heat convection and radiation inside the trough, the conduction in the trough itself and soil, the convection to the surface air, and the solar radiation. Extensive finite-element verification in steady state and transients demonstrates the accuracy of the proposed equivalent circuit.

Original languageEnglish (US)
Article number6218216
Pages (from-to)1423-1431
Number of pages9
JournalIEEE Transactions on Power Delivery
Volume27
Issue number3
DOIs
StatePublished - 2012

Keywords

  • Ampacity
  • cable thermal rating
  • finite elements
  • intensity of solar radiation
  • unfilled troughs

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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