Influence of oil electrification on ac breakdown between metallic electrodes

Author

Massala, G. ; Lesaint, O. ; Moreau, O.

Author_Institution

CNRS, Grenoble, France

Volume

1

fYear

2000

fDate

2000

Firstpage

89

Abstract

This paper presents experimental investigations concerning the influence of space charge on the ac breakdown of moving mineral oil, between metallic electrodes. Space charges are injected in oil with sharp metallic points, and carried into the breakdown test cell through a perforated ground electrode. Breakdown voltages are measured under ac voltage in rod-sphere or sphere-sphere electrode at 5 and 10 cm gap distances. The results show that, whatever the flow rate of oil and the amount of charge injected, no significant influence on ac breakdown voltage is observed. As a consequence, it appears that the deleterious effect of static electrification of oil in devices like power transformers cannot be simply ascribed to a degradation of the intrinsic oil performance

Keywords

electrodes; power transformer testing; space charge; static electrification; transformer oil; 5 to 10 cm; ac breakdown; breakdown test cell; breakdown voltages; metallic electrodes; moving mineral oil; oil electrification; perforated ground electrode; power transformers; rod-sphere electrode; space charge; sphere-sphere electrode; static electrification; Breakdown voltage; Degradation; Electric breakdown; Electrodes; Minerals; Petroleum; Power transformers; Space charge; Testing; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2000 Annual Report Conference on

Conference_Location

Victoria, BC

Print_ISBN

0-7803-6413-9

Type

conf

DOI

10.1109/CEIDP.2000.885234

Filename

885234