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

fYear

1999

fDate

1999

Firstpage

414

Lastpage

417

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICDL.1999.798960

Filename

798960