Abstract :
Results obtained in the AIEE-Engineering Foundation research project on the stability of impregnated-paper insulation, since its inception in 1936, are reported briefly. Some unexpected properties of impregnated-paper insulation have been discovered and findings pertaining to paper density, high-stress internal ionization as the origin of failure, and impregnation temperature versus dielectric strength and life indicate that further research in these fields is desirable.
