The movement of a conducting particle in transformer oil in AC fields

Author

Birlasekaran, S.

Volume

28

Issue

1

fYear

1993

fDate

2/1/1993 12:00:00 AM

Firstpage

9

Lastpage

17

Abstract

A theoretical model is proposed and used to analyze the movement of a small conducting sphere stressed with alternating voltage in transformer oil. The model is verified by comparing it with the experimental observations of a metal particle of radius 0.5 mm in an electrode gap of 8 mm stressed with AC voltage. The model suggests that for practically existing micrometer-sized particles (≃50 μm diameter), the opposing viscous force is the most significant component. The viscous force is dissipated in the medium as fluid drag both along and perpendicular to the direction of movement. A theoretical analysis of the contribution of multiple particles to viscous drag is presented, and is shown to provide a possible explanation for the experimentally observed particle cloud formation at lower AC stresses and dispersion at higher AC stresses

Keywords

electrohydrodynamics; insulating oils; transformer insulation; 0.5 mm; 50 micron; 8 mm; AC fields; AC stresses; alternating voltage; cloud formation; conducting particle movement; electrode gap; fluid drag; metal particle; micrometer-sized particles; theoretical model; transformer oil; viscous drag; viscous force; Clouds; Drag; Electric breakdown; Electrodes; Oil insulation; Petroleum; Pollution measurement; Stress; Testing; Voltage;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.192235

Filename

192235