Title :
Degradation of HV generator insulation under mechanical, electrical and thermal stresses
Author_Institution :
Dept. High Voltage Eng., Indian Inst. of Sci., Bangalore, India
Abstract :
The results of aging experiments under combined electrical, mechanical (vibration), and thermal stresses on epoxy-bonded mica insulation are presented. Actual 11-kV machine coils designed for use in 1 MW rotating machines are used as the specimens. Both diagnostic and destructive tests were carried out to assess the amount of aging. It was observed that the incremental loss tangent and partial discharge energy per cycle increased monotonically with time of aging and that the dielectric strength fell monolithically, thus indicating a high degree of correlation between these properties
Keywords :
AC generators; ageing; coils; insulation testing; loss angle; machine insulation; organic insulating materials; partial discharges; 1 MW; 11 kV; HV generator insulation; aging experiments; destructive tests; dielectric strength; electrical stress; epoxy-bonded mica insulation; incremental loss tangent; machine coils; mechanical stress; partial discharge energy; rotating machines; thermal stresses; Aging; Coils; Dielectric losses; Dielectrics and electrical insulation; Partial discharges; Rotating machines; Testing; Thermal degradation; Thermal stresses; Vibrations;
Conference_Titel :
Electrical Insulation, 1990., Conference Record of the 1990 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
DOI :
10.1109/ELINSL.1990.109699
