Discussion of space-charge life model features in dc and ac electrical aging of polymeric materials

Author

Dissado, L. ; Mazzanti, G. ; Montanari, G.C.

Author_Institution

Dept. of Eng., Leicester Univ., UK

Volume

1

fYear

1997

fDate

19-22 Oct. 1997

Firstpage

36

Abstract

In this paper, the features of a thermodynamic life model for polymeric insulation, based on the effect of space-charge trapped within the dielectric, are investigated by comparing the application of the model to dc and ac life data obtained from accelerated tests. The changes of parameter values when the model is used to fit both dc and ac life data are pointed out and indications derived from the corresponding variations in activation enthalpy and entropy of the degradation process. This leads to a deeper understanding of the alteration of the aging mechanisms from dc to ac regime and suggests ways to achieve the formulation of a proper model valid for life under ac electrical stress.

Keywords

ageing; insulation testing; life testing; organic insulating materials; power cable insulation; space charge; ac electrical stress; ac life data; accelerated tests; activation enthalpy; activation entropy; aging mechanisms; dc life data; degradation process; electrical aging; polymeric materials; space-charge life model features; thermodynamic life model;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1997. IEEE 1997 Annual Report., Conference on

Conference_Location

Minneapolis, MN, USA

Print_ISBN

0-7803-3851-0

Type

conf

DOI

10.1109/CEIDP.1997.634553

Filename

634553