Title :
A Weibull approach to the investigation of partial discharges in aged insulation systems
Author :
Contin, A. ; Gulsk, E. ; Cacciari, M. ; Montanar, G.C.
Author_Institution :
Dipartimento di Elettrotecnica Elettronica ed Inf., Trieste Univ., Italy
Abstract :
This paper deals with application of stochastic procedures for the analysis of partial discharge height distributions (PDHD) detected during the aging of insulation systems. Aging experiments were made considering an artificial flat cavity and a 23 kV epoxy-resin insulator. The influence of the aging process on PDHD is observed during long-term voltage application until breakdown of both objects. It is shown that the time evolution of parameters can be connected with aging phenomena. In particular, the variation of shape and scale parameters with aging time offers a key of lecture of the PD mechanism which seems quite useful for diagnosis inference of the insulation system
Keywords :
ageing; electric breakdown; epoxy insulation; epoxy insulators; insulator testing; partial discharges; stochastic processes; 23 kV; aged insulation systems; artificial flat cavity; diagnosis inference; epoxy-resin insulator; insulation breakdown tests; long-term voltage application; partial discharge height distributions; scale parameters; shape parameters; stochastic procedures; Aging; Breakdown voltage; Dielectrics and electrical insulation; Electric breakdown; Maximum likelihood estimation; Partial discharges; Performance evaluation; Shape measurement; Stochastic processes; Testing;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549369
