Overview of on-line and off-line ampacity identification techniques of bare overhead transmission line

Abdallah Abdael Baset, M. Emad Farrag, Shahab Farokhi, Donald M. Hepburn

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

1 Citation (Scopus)
119 Downloads (Pure)


The economics of power transmission requires operators to maximise the power through the network. Increasing knowledge of the impact of environmental factors on the current carrying capabilities of bare wire overhead lines is, therefore, important. Cost savings resulting from enhancing thermal transfer capabilities of transmission lines has motivated many utilities and power systems research centres to investigate techniques for maximising operational parameters. Enhancing power ratings of bare power conductors brings, alongside improved generated power dispatch flexibility, cost savings and economical and technical challenges. The aim of this paper is to examine some of the existing techniques employed to compute the ampacity of bare power lines and discuss practical limitations of these techniques. In addition, the impact of each technique will be considered from an operational prospective.
On-line and off-line techniques are summarised and compared based on the nature and quality of power sources connected to the system, e.g. power output of windfarms tends to be of intermittent nature.
Original languageEnglish
Title of host publication2016 51st International Universities Power Engineering Conference (UPEC)
Number of pages4
ISBN (Electronic)9781509046508
ISBN (Print)9781509046515
Publication statusPublished - 20 Nov 2017


  • conductors
  • power transmission lines
  • meteorology
  • monitoring
  • thermal conductivity
  • real-time systems
  • transmission line measurements
  • dynamic thermal ratings
  • ruling span of transmission line and thermal time constant
  • ampacity of bare power lines
  • generation dispatch

ASJC Scopus subject areas

  • Energy Engineering and Power Technology


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