Title :
Aging of dielectric liquid-impregnated-paper insulated bushings under voltage switching surges
Author :
Colla, F. ; Pompili, M. ; Mazzetti, C. ; Ratti, U. ; Bartnikas, Ray
Author_Institution :
ABB Transmission, Pomezia, Italy
Abstract :
Aging studies have been carried out on dielectric liquid-impregnated-paper insulated bushings subjected to voltage switching surges. The rate of deterioration of the insulating system of the bushings increased with the number of the switching surges applied. The extent of aging or deterioration of the insulating system was manifest by a decrease in the partial discharge inception voltage and an increase in the cumulative apparent charge transfer. An improvement in the partial discharge characteristics was observed when the bushing specimen was allowed to remain under stress-free conditions for an extended period of time prior to the application of the subsequent series of repetitive impulses
Keywords :
ageing; bushings; dielectric liquids; impregnated insulation; insulation testing; paper; partial discharges; aging; cumulative apparent charge transfer; dielectric liquid-impregnated-paper insulated bushings; partial discharge inception voltage; stress-free conditions; voltage switching surges; Aging; Charge transfer; Circuit testing; Dielectric liquids; Dielectrics and electrical insulation; Insulators; Partial discharge measurement; Partial discharges; Surges; Voltage;
Conference_Titel :
Dielectric Liquids, 1999. (ICDL '99) Proceedings of the 1999 IEEE 13th International Conference on
Conference_Location :
Nara
Print_ISBN :
0-7803-4759-5
DOI :
10.1109/ICDL.1999.798960
