Effects of negative direct voltage pre-stressing on the breakdown of conductor-rod gaps under positive impulse voltages

Author

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

Author_Institution

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

Volume

145

Issue

3

fYear

1998

fDate

5/1/1998 12:00:00 AM

Firstpage

105

Lastpage

109

Abstract

The sparkover of a 50 cm conductor rod gap under positive impulses is investigated when a pre-stressing negative direct voltage is applied to the rod. Under lightning impulses the pre-stress has a small effect on the breakdown voltage of the gap. For long-front impulses, a considerable increase in the dielectric strength of the gap can be observed. Several parameters affect this behaviour, like the value of the prestressing direct voltage, the diameter of the energised conductor, the position of the rod with regard to the conductor and the waveshape of the applied impulse

Keywords

air gaps; electric strength; humidity; lightning protection; probability; transients; breakdown probability; breakdown voltage; conductor-rod gaps; dielectric strength; energised conductor; humidity effect; lightning impulses; long-front impulses; negative direct voltage; negative direct voltage pre-stressing; positive impulse voltages; sparkover; waveshape;

fLanguage

English

Journal_Title

Science, Measurement and Technology, IEE Proceedings -

Publisher

iet

ISSN

1350-2344

Type

jour

DOI

10.1049/ip-smt:19981964

Filename

682028