Title :
AC degradation of impregnated polypropylene films
Author :
Sebillotte, E. ; Theoleyre, S. ; Said, S. ; Gosse, B. ; Gosse, J.P.
Author_Institution :
Varilec, Pringy, France
fDate :
6/1/1992 12:00:00 AM
Abstract :
The aging of impregnated polypropylene (PP) film has been carried out on capacitor models at 80°C under 50 Hz AC electrical stress (137 Vrms/μm). The damage was estimated from the local measurement of the breakdown voltage of the PP film. The effects of impurities (electrolyte, water, oxygen) added to the impregnating liquid were observed. The relatively low breakdown voltages of the aged film measured in the electrically stressed region were no longer found when the liquid contained epoxides. A chemical degradation analyzed by FT-IR microspectroscopy and gel permeation chromatography was observed and found only in the region of lower dielectric strength
Keywords :
ageing; dielectric losses; electric breakdown of solids; electric strength; environmental degradation; impurities; organic insulating materials; polymer films; power capacitors; 50 Hz; 80 C; AC degradation; FT-IR microspectroscopy; aging; breakdown voltage; capacitor models; chemical degradation; electrical stress; gel permeation chromatography; impregnated polypropylene films; impregnating liquid; impurities; local measurement; power capacitors; Aging; Aluminum; Breakdown voltage; Chemical analysis; Degradation; Dielectrics; Electric breakdown; Polymer films; Power capacitors; Stress;
Journal_Title :
Electrical Insulation, IEEE Transactions on
