Mitigation of lightning overvoltage in gas insulated substations concerning ferromagnetic ring effect. (8th June 2016)

• Record Type: Journal Article
• Authors: Abd‐Elhady, Amr M.; Ibrahim, Mohamed E.; Mansour, Arafa S.
• Is Part Of: International transactions on electrical energy systems. Volume 26:Number 12(2016:Dec.)
• Page Start: 2573
• Page End: 2587
• Publication Date: 2016-06-08
• Subjects: GIS -- steepness -- ferromagnetic ring -- lightning overvoltages -- surge arrester -- ATP/EMTP; Electric power -- Periodicals; Electric power systems -- Periodicals; Electrical engineering -- Periodicals; 621.3
• DOI: 10.1002/etep.2222
• Languages: English
• ISSNs: 2050-7038

Abstract

Summary: In this paper, the impact of surge arresters and ferromagnetic ring on the magnitude as well as the steepness of lightning overvoltages in gas insulated substation (GIS) are investigated. This investigation is carried out through modeling of a typical 380‐kV GIS using ATP/EMTP for very fast transient overvoltages. Two scenarios of lightning strikes, backflashover and shielding failure are considered. Also, the impact of ferromagnetic ring on the surge arrester performance is evaluated. The evaluation is carried out considering surge arresters located at entrance, and at transformer terminals of GIS. Finally, the effect of ferromagnetic ring parameters on the arresters performance is evaluated and discussed. The obtained results show that the presence of ferromagnetic ring can affect the rating selection of GIS surge arresters. Copyright © 2016 John Wiley & Sons, Ltd.