Assessing electrocution risks in transmission substations using probabilistic criteria

A. Amin, N. Harid, A. Dimopoulos, D. Guo, H. Griffiths, G. Mpofu, A. Haddad, D. Frame

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The following work investigates the risk of electrocution from earth potential rise at transmission substations and nearby third party locations as a result of a power system earth fault. Current earthing standards use a deterministic approach where the risk assessment considers a set of worst-case conditions. However, it is recognised that most of the parameters involved in calculating the earth potential rise and associated safety voltages are probabilistic by nature. A probabilistic technique has been developed to determine the risk of electrocution of an individual under power system earth fault conditions. The so determined individual risk can be compared with accepted health & safety risk levels, employing the ALARP principle (as low as reasonably practicable). This paper presents improvements to the developed probabilistic technique by introducing defined risk zones with specific probability of presence and introducing exclusion zones where there is virtually no touch voltage risk. The improved technique is applied to a practical case study electrical installation.

Original languageBritish English
Title of host publication2013 48th International Universities' Power Engineering Conference, UPEC 2013
DOIs
StatePublished - 2013
Event2013 48th International Universities' Power Engineering Conference, UPEC 2013 - Dublin, Ireland
Duration: 2 Sep 20135 Sep 2013

Publication series

NameProceedings of the Universities Power Engineering Conference

Conference

Conference2013 48th International Universities' Power Engineering Conference, UPEC 2013
Country/TerritoryIreland
CityDublin
Period2/09/135/09/13

Keywords

  • Earth Potential Rise
  • Earthing
  • Probability
  • Risk Assessment

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