Impulse breakdown of short rod-plane gaps and the influence of humidity

Author

Mikropoulos, P.N. ; Stassinopoulos, C.A.

Author_Institution

Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK

Volume

145

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

141

Lastpage

146

Abstract

An attempt is made to assess the extent of influence of various parameters on the breakdown mechanism in short rod-plane gaps under positive impulses. Such parameters include front duration and peak value of the impulse voltage, gap length, profile of the rod and, in particular, absolute humidity. Depending on the above parameters, breakdown occurs either through a streamer-dominated breakdown mechanism or through one involving the development of a small leader. The second corona was found to predesignate which mechanism will take place, thus influencing the statistical behaviour of breakdown, Calculated humidity correction factors were found to be different from those proposed by IEC

Keywords

air gaps; corona; electric breakdown; probability; transients; IEC standard; absolute humidity; breakdown mechanism; front duration; gap length; humidity correction factors; humidity influence; impulse breakdown; impulse voltage; peak value; positive impulses; predischarge phenomena; probability distributions; rod profile; second corona; short rod-plane gaps; small leader; statistical behaviour; streamer-dominated mechanism;

fLanguage

English

Journal_Title

Science, Measurement and Technology, IEE Proceedings -

Publisher

iet

ISSN

1350-2344

Type

jour

DOI

10.1049/ip-smt:19982106

Filename

707314