The compensation law revisited-Application to dielectric aging

Author

Crine, Jean-Pierre

Author_Institution

Inst. de Recherche d´´Hydro-Quebec, Varennes, Que., Canada

Volume

26

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

811

Lastpage

818

Abstract

The fundamental origin of the compensation law observed by P. K. David (1987, 1988) and G. C. Montanari (1988) in several aging mechanisms of dielectrics is discussed. It is shown that this is due to a linear relation between activation entropy and enthalpy of a given process. An aging model, partially based on the rate theory, is presented. One of its advantages is that it characterizes dielectric aging by a free energy change, rather than by an apparent activation energy. Some aging data are analyzed with the proposed model, and it is shown that under high stresses the failure time varies exponentially with stress. Some critical comments are made regarding the use of arbitrary end points as a method of selection for a failure criterion

Keywords

ageing; electric breakdown of solids; activation entropy; compensation law; dielectric aging; enthalpy; failure time; free energy change; high stresses; rate theory; Aging; Data analysis; Dielectrics; Entropy; Equations; Extrapolation; Failure analysis; Mechanical factors; Temperature; Thermal stresses;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.83707

Filename

83707