Streamer propagation in composite oil/cellulose insulation under LI voltages

Author

Liu, Rongsheng ; Jaksts, Albert ; Bengtsson, Tord

Author_Institution

ABB Corp. Res., Vasteras, Sweden

fYear

2000

fDate

2000

Firstpage

426

Lastpage

430

Abstract

A needle/plane geometry was used to study fundamental properties of streamer propagation in composite transformer oil/cellulose insulation under LI (lightning impulse: 1.2/50 μs) voltages. The plane electrode was either an aluminium plate (bare oil gap) or covered with laminated oil-impregnated paper of different thickness. Breakdown voltage and streamer propagation speed were seen to differ at different polarities and dependent on the gap length of the needle/plane geometry. A ratio of oil-gap length to electrode cover thickness seems to exist, below which, the cover thickness dominates the breakdown of the composite insulation. Above that, length of the oil gap dominates the breakdown

Keywords

discharges (electric); electric breakdown; impregnated insulation; paper; transformer oil; Al; aluminium plate; breakdown voltage; composite transformer oil/cellulose insulation; laminated oil impregnated paper; lightning impulse voltage; needle-plane electrode system; oil gap; streamer propagation; Aluminum; Electric breakdown; Electrodes; Geometry; Lightning; Needles; Oil insulation; Optical propagation; Petroleum; Power transformer insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 2000. Conference Record of the 2000 IEEE International Symposium on

Conference_Location

Anaheim, CA

ISSN

1089-084X

Print_ISBN

0-7803-5931-3

Type

conf

DOI

10.1109/ELINSL.2000.845540

Filename

845540