Effect of liquid flow velocity on the breakdown voltage of mineral oil under highly nonuniform fields

Author

Zaky, A.A. ; Megahed, I.Y. ; El-Awa, M.

Author_Institution

Coll. of Eng., Sultan Qaboos Univ., Muscat, Oman

fYear

1990

fDate

10-14 Sep 1990

Firstpage

564

Lastpage

568

Abstract

The effect of forced flow velocity on the breakdown voltage/gap length characteristics of transformer oil was studied using a needle point and a mesh plane electrode system. The velocity of the axial (co-field) oil flow varied from 0 to 280 cm/s. Tests were carried out on degassed oil, O₂-saturated oil, and SF₆-saturated oil for negative and positive point polarities. For degassed oil there was a large increase in the breakdown voltage with increasing oil velocity for both polarities of the point and over the whole range of gaps examined. For O₂- and SF₆-saturated oils a similar increase in breakdown voltage was observed only with the point negative. With the point positive, velocities above 90 cm/s had no effect

Keywords

electric breakdown of liquids; insulating oils; transformer insulation; 0 to 2800 mm/s; O₂-saturated oil; SF₆-saturated oil; breakdown voltage; degassed oil; gap length characteristics; highly nonuniform fields; liquid flow velocity; mesh plane electrode; mineral oil; needle point; oil flow; oil velocity; transformer oil; Breakdown voltage; Electrodes; Fluid flow; Lubricating oils; Minerals; Oil insulation; Petroleum; Solids; Testing; Wire;

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.1990.202966

Filename

202966