Flow electrification in high power transformers: BTA effect on pressboard degraded by electrical discharges

Author

Moreau, E. ; Paillat, T. ; Touchard, G.

Author_Institution

Groupe Electrofluidodynamique, Univ. de Poitiers, Futuroscope, France

Volume

10

Issue

1

fYear

2003

Firstpage

15

Lastpage

21

Abstract

The flow electrification process occurring at the oil-pressboard interface in high power transformers seems to cause electrical discharge incidents and may cause failures. The goal of this experimental study is to measure and to compare the streaming current obtained from unused pressboard, pressboard artificially degraded by electrical discharges, and pressboard obtained from a damaged power transformer. The influence of additive 1,2,3 Benzotriazole (BTA) in oil is also analyzed. The results show that flow electrification is greatly increased by the degraded pressboards compared with the new one. On the other hand, adding of BTA significantly reduces flow electrification.

Keywords

discharges (electric); electric charge; impregnated insulation; insulation testing; power transformer insulation; power transformer testing; transformer oil; 1,2,3 Benzotriazole additive; artificially degraded pressboard; damaged power transformer; electrical discharge incidents; electrical discharges; flow electrification process; high power transformers; oil-pressboard interface; streaming current measurement; unused pressboard; Chemicals; Current measurement; Degradation; Oil insulation; Petroleum; Power measurement; Power transformer insulation; Power transformers; Surface discharges; Temperature;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2003.1176551

Filename

1176551