A comparative investigation of electrothermal endurance models for insulating materials and systems characterization

Abstract

Inference of ageing mechanisms becomes a very complex matter in insulations, where the presence of electrical field concentrations, temperature gradients, various insulating materials, inhomogeneities, etc., complicates tremendously any physical investigation. This paper focuses on recent developments in modeling insulation behavior under thermo-electrical stresses. In particular, a comparison between phenomenological and physical models, with the relevant limits and constraints, is presented. Moreover, a probabilistic approach, which may hold for materials and systems as well, is discussed, referring to both parametric and non-parametric models.