Title :
Breakdown of a thin dielectric liquid layer
Author :
Brosseau, Christian
Author_Institution :
CERMO, Univ. Joseph Fourier, Saint-Martin-d´´Heres, France
fDate :
12/1/1992 12:00:00 AM
Abstract :
Measurements of electrical breakdown on thin (10-100-μm) liquid dielectric (capacitor impregnant) layers for different interfacial situations are discussed. For this purpose a new uniform field electrode arrangement that represents interfacial conditions close to those of industrial practice was developed. It was investigated experimentally how the dielectric strength depends on such factors as electrode area, gap spacing, nature of the interface in contact with the liquid, and temperature. The breakdown phenomena are shown to be either related to high-field conduction (i.e., boiling or electrohydrodynamic cavitation leading to the generation of a vapor bubble in the prebreakdown regime) or related to the presence of particles or to local field enhancements
Keywords :
dielectric properties of liquids and solutions; dielectric thin films; electric breakdown of liquids; electric strength; insulating oils; insulation testing; materials testing; power capacitors; 10 to 100 micron; boiling; breakdown phenomena; capacitor impregnant; dielectric strength; electrical breakdown measurements; electrode area; electrohydrodynamic cavitation; gap spacing; high-field conduction; industrial practice; interface nature; interfacial conditions; local field enhancements; organic liquids; prebreakdown regime; presence of particles; temperature; thin dielectric liquid layer; uniform field electrode arrangement; vapor bubble; Dielectric breakdown; Dielectric liquids; Dielectric measurements; Electric breakdown; Electrodes; Partial discharges; Physics; Power capacitors; Residual stresses; Voltage;
Journal_Title :
Electrical Insulation, IEEE Transactions on
