Effect of liquid motion on breakdown voltage under divergent electric fields in transformer oil

Author

Hanaoka, R. ; Ishibashi, R. ; Aoyagi, T. ; Asada, Y. ; Nishi, T.

Author_Institution

Dept. of Electr. Eng., Kanazawa Inst. of Technol., Japan

fYear

1990

fDate

10-14 Sep 1990

Firstpage

301

Lastpage

305

Abstract

Conduction current and liquid motion under divergent electric fields in transformer oil were measured, and the effect of polarity on the DC breakdown voltage was clarified. Electric field and space charge density distributions near the breakdown were computed, taking the liquid motion into account. It was deduced that the breakdown occurred due to the field enhancement in front of the plane electrode, and it was demonstrated that the breakdown voltage in the case of the negative sharp electrode was much higher than in the case of the positive one

Keywords

electric breakdown of liquids; insulating oils; space charge; transformer insulation; DC breakdown; breakdown voltage; conduction current; divergent electric fields; field enhancement; liquid motion; negative sharp electrode; polarity; space charge density; transformer oil; Blades; Breakdown voltage; Current measurement; Electrodes; Geometry; Motion measurement; Needles; Oil insulation; Space charge; Space technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Conduction and Breakdown in Dielectric Liquids, 1990. ICDL 1990. Conference Record., 10th International Conference on

Conference_Location

Grenoble

Type

conf

DOI

10.1109/ICDL.1990.202911

Filename

202911