Lightning in hybrid cable-overhead lines and consequent transient overvoltages

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

Whereas lines that consist entirely of underground cable are naturally protected from lightning, the phenomenon must be considered for lines that are a mix of overhead lines and underground cables. The difference between overhead lines and underground cables wave impedances may lead to transient overvoltages caused by reflections at the transitions points. This paper explains the phenomenon and analyses the influence of modelling Corona effect, the grounding of the towers and of the cable’s screen on the overvoltage magnitude. The analysis is made both for direct strokes on the overhead line phase conductor and for hits on the earth wire, with and without back flashover. For the most common situation, stroke on the earth wire, it is demonstrated that the cable’s ground propagation mode is dominant, reducing the impact of the reflections.
Original languageEnglish
Title of host publicationProceedings of International Conference on Power Systems Transients, IPST 2017
Number of pages7
PublisherInternational Conference on Power Systems Transients, IPST 2017
Publication dateJun 2017
Article number17IPST083
Publication statusPublished - Jun 2017
EventInternational Conference on Power System Transients - Sungkyunkwan University (SKKU), Seoul, Korea, Democratic People's Republic of
Duration: 26 Jun 201729 Jun 2017
http://ipst2017.com/

Conference

ConferenceInternational Conference on Power System Transients
LocationSungkyunkwan University (SKKU)
CountryKorea, Democratic People's Republic of
CitySeoul
Period26/06/201729/06/2017
Internet address

Keywords

  • Hybrid cable-overhead lines
  • Lightning
  • Corona
  • Transient Overvoltages

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