Investigation of the seasonal variation of ground thermal conductivity on high voltage cable ampacity

Carolyn L. Cooper, Michael L. Dyer, George G. Karady

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Total cable loading depends on heat dissipation from the cables due to their current and the surrounding thermal environment. Cable currents, jacket temperatures, and ambient air temperatures were recorded by an underground thermocouple based data acquisition system. This allowed for the analysis of temperature effects on the cable duct from both sources. There is interaction between the adjacent cables. A step in current corresponds to a transient response it its jacket temperature. Daily ambient air extremes correlated well with the daily current and cable jacket temperature extremes. The thermal area of influence was reduced from what was previously thought, a circle of radius 10ft, allowing for the tighter placement of adjacent underground ducts. The assumed value for thermal resistance used in the software modeling was verified. Seasonal trends were obtained and used to find a temperature delay that will be used to create an overload duration chart for emergency loads.

Original languageEnglish (US)
Title of host publication2004 Large Engineering Systems Conference on Power Engineering - Conference Proceedings; Theme
Subtitle of host publicationEnergy for the Day After Tomorrow
Pages108-112
Number of pages5
StatePublished - Dec 1 2004
Event2004 Large Engineering Systems Conference on Power Engineering - Conference Proceedings; Theme: Energy for the Day After Tomorrow - Halifax, NS, United States
Duration: Jul 28 2004Jul 30 2004

Publication series

Name2004 Large Engineering Systems Conference on Power Engineering - Conference Proceedings; Theme: Energy for the Day After Tomorrow

Other

Other2004 Large Engineering Systems Conference on Power Engineering - Conference Proceedings; Theme: Energy for the Day After Tomorrow
CountryUnited States
CityHalifax, NS
Period7/28/047/30/04

Keywords

  • Cable ampacity
  • Cable jacket
  • Duct bank
  • Ground thermal resistance
  • Temperature variation

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Cooper, C. L., Dyer, M. L., & Karady, G. G. (2004). Investigation of the seasonal variation of ground thermal conductivity on high voltage cable ampacity. In 2004 Large Engineering Systems Conference on Power Engineering - Conference Proceedings; Theme: Energy for the Day After Tomorrow (pp. 108-112). (2004 Large Engineering Systems Conference on Power Engineering - Conference Proceedings; Theme: Energy for the Day After Tomorrow).