Static electrification induced by oil flow in power transformers

Author

Peyraque, L. ; Beroual, A. ; Buret, F.

Author_Institution

Jeumont Schneider Transformateurs, Lyon, France

Volume

2

fYear

1996

fDate

16-19 Jun 1996

Firstpage

745

Abstract

This work concerns the study of the static electrification phenomena on a real power transformer equipped with an exceptional set of oil pumps allowing different tests to be performed with an oil flow reaching nearly five times the rated value. The transformer was filled with two kinds of oils, aged and new, in order to compare their electrostatic charging tendency (ECT). The static electrification levels are analyzed through measurement of the leakage currents under unenergized and energized conditions, and by varying the temperature. Dielectric contraints and temperature are adjusted to values inducing the maximum electrification level. The consequences of static electrification on insulation reliability are analyzed based on the electrification level and acoustically measured partial discharges

Keywords

ageing; electric breakdown; electric current measurement; insulation testing; leakage currents; partial discharges; power transformer insulation; power transformer testing; static electrification; transformer oil; acoustically measured partial discharges; aged insulation; dielectric contraints; electrostatic charging tendency; insulating oil flow; insulation breakdown tests; insulation reliability; leakage currents measurement; maximum electrification level; power transformers; static electrification phenomena; temperature variation; Acoustic measurements; Aging; Dielectric measurements; Oil insulation; Performance evaluation; Petroleum; Power transformer insulation; Power transformers; Temperature; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on

Conference_Location

Montreal, Que.

ISSN

1089-084X

Print_ISBN

0-7803-3531-7

Type

conf

DOI

10.1109/ELINSL.1996.549452

Filename

549452