Behaviour of positive conductor-rod gaps stressed by impulse voltages in atmospheric air

Author

Gourgoulis, D.E. ; Mikropoulos, P.N. ; Stassinopoulos, C.A. ; Yakinthos, C.G.

Author_Institution

Dept. of Electr. & Comput. Eng., Aristotelian Univ. of Thessaloniki, Greece

Volume

144

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

209

Lastpage

214

Abstract

Results were obtained and evaluated so as to investigate the influence of various parameters on the breakdown mechanism of a 50 cm positive conductor-rod gap under impulse voltages. For such a gap it was found that several parameters affect its breakdown characteristics, notably humidity, waveshape of the applied impulse, diameter of the energised conductor and position of the earthed rod with respect to the conductor. Breakdown probability curves have been established, gap factors computed and their dependence on the aforementioned parameters investigated. Finally, the paths taken by the spark channel have been studied. Based on the information gained several suggestions concerning the breakdown mechanism are proposed

Keywords

air gaps; overvoltage; power system transients; 50 cm; atmospheric air; breakdown mechanism; breakdown probability curves; earthed rod position; energised conductor diameter; gap factors; gap geometry; humidity effect; impulse voltage stressed; impulse waveshape effect; positive conductor-rod gaps; spark channel; sparkover voltage; streamer lengths;

fLanguage

English

Journal_Title

Science, Measurement and Technology, IEE Proceedings -

Publisher

iet

ISSN

1350-2344

Type

jour

DOI

10.1049/ip-smt:19971250

Filename

620457