Light emission study in transformer oil and along oil/cellulose interface using a spark-gap system

Author

Liu, Rongsheng ; Jaksts, Albert ; Walfridsson, Lars

Author_Institution

ABB Corp. Res., Vasteras, Sweden

fYear

1997

fDate

22-25 Sep 1997

Firstpage

469

Lastpage

475

Abstract

Interfaces between oil and oil-impregnated-pressboard are known to weaken insulation system strength. The work here describes differences in the observed discharges in transformer oils and along oil/oil-impregnated-pressboard interfaces. Oil breakdown in a uniform electric field was initiated by triggering a spark gap either at the anode or at the cathode using a liquid trigatron. Light emission during the breakdown processes was detected using a photomultiplier tube. Breakdown voltage, time to breakdown, streamer propagation speed and polarity effect were seen to differ in a transformer oil and along an oil/oil-impregnated pressboard interface

Keywords

anodes; cathodes; composite insulating materials; discharges (electric); gas-discharge tubes; insulation testing; optical variables measurement; photomultipliers; power transformer insulation; power transformer testing; spark gaps; transformer oil; anode; breakdown voltage; cathode; discharges; insulation system strength weakening; light emission study; liquid trigatron; oil breakdown; oil-impregnated-pressboard; oil/cellulose interface; oil/oil-impregnated-pressboard interfaces; photomultiplier tube; polarity effect; spark gap triggering; spark-gap system; streamer propagation speed; time to breakdown; transformer oil; uniform electric field;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation Conference, 1997, and Electrical Manufacturing & Coil Winding Conference. Proceedings

Conference_Location

Rosemont, IL

ISSN

0362-2479

Print_ISBN

0-7803-3959-2

Type

conf

DOI

10.1109/EEIC.1997.651192

Filename

651192