Title :
Formation of vapor bubbles in nonpolar liquids initiated by current pulses
Author :
Kattan, R. ; Denat, A. ; Bonifaci, N.
Author_Institution :
Lab. d´´Electrostat. et de Mater. Dielectr., CNRS, Grenoble, France
fDate :
8/1/1991 12:00:00 AM
Abstract :
The electrical conduction of purified nonpolar liquids with point/plane electrode geometry was studied as a function of various parameters. For negative polarity of the point, a pulse regime has been observed which is greatly similar to the Trichel pulses occurring in air, with the exception of no pressure dependence. At atmospheric pressure, bubble formation was correlated with current pulse. The authors present a study of the generation and dynamics of the bubble as a function of various parameters: injected energy, hydrostatic pressure (⩽12 MPa), and the nature of the liquid. Results obtained for liquid hydrocarbons of different physical and electronic properties are compared and discussed. The transition to a slow bush-like streamer phenomenon is discussed
Keywords :
bubbles; discharges (electric); electric breakdown of liquids; electrical conductivity of liquids; high-pressure phenomena and effects; 12 MPa; atmospheric pressure; bubble formation; bush-like streamer phenomenon; current pulses; electrical conduction; electronic properties; hydrostatic pressure; negative polarity; nonpolar liquids; point/plane electrode geometry; pulse regime; vapor bubbles; Current measurement; Electrodes; Geometry; Helium; Hydrocarbons; Liquids; Optical pulse generation; Pulse compression methods; Pulse measurements; Threshold voltage;
Journal_Title :
Electrical Insulation, IEEE Transactions on