The role of electrostatic and hydrodynamic forces in the negative-point breakdown of liquid dielectrics

Author

Watson, P. Keith ; Chadband, W.G. ; Sadeghzadeh-Araghi, M.

Author_Institution

Xerox Corp., Webster, NY, USA

Volume

26

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

543

Lastpage

559

Abstract

By combining simple electrostatic and hydrodynamic concepts one can derive equations for cavity growth, the instability growth rate, and streamer velocity, with results in reasonable agreement with experiments at voltages near breakdown, in short gaps. In high-viscosity fluids other hydrodynamic growth processes are observed. Thus in 100 and 1000 cSt DC-200 silicone fluids a vortex of hot liquid forms near the point cathode and this vortex develops into a vortex ring which grows and decays; at high fields the vortex undergoes an unstable growth process, leading to multiple vortices

Keywords

dielectric properties of liquids and solutions; discharges (electric); electric breakdown of liquids; electrohydrodynamics; silicones; vortices; 1000 cSt DC-200 silicone fluids; cavity growth; electrostatic forces; high fields; high-viscosity fluids; hot liquid; hydrodynamic forces; hydrodynamic growth processes; instability growth rate; liquid dielectrics; multiple vortices; negative-point breakdown; point cathode; short gaps; streamer velocity; unstable growth process; vortex; vortex ring; Breakdown voltage; Dielectric breakdown; Dielectric liquids; Electric breakdown; Electrodes; Electrons; Electrostatics; Gases; Hydrodynamics; Optical vortices;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.83669

Filename

83669