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 grad ien ts, various ins u la t ing m a t e ria 1 s, inhomogeneities, etc., complicates tremendously a n y physical in vest igat ion.

Electrothermal lifetime prediction of polyimide wire insulation with application to aircraft

“…(10), the yintercept is equivalent to the y-intercept of the logarithm of eq. (12). Consequently, these equations can be assimilated as follows:…”

“…11 More recently, Montanari and coworkers have further developed the modeling of aging and degradation of electrical insulation by improving the understanding of physical phenomena that occur during the aging. [12][13][14][15] Their work with partial discharge measurements to monitor electrical tree growth in degrading samples continues to advance aging investigation. 12 Building on Toop's model, they also present the theoretical background to relate lifelines for the aging compensation effect theory.…”

“…[12][13][14][15] Their work with partial discharge measurements to monitor electrical tree growth in degrading samples continues to advance aging investigation. 12 Building on Toop's model, they also present the theoretical background to relate lifelines for the aging compensation effect theory. 13 Consequently, the method is valid not just for parallel linear lifelines but also for non-parallel linear lifelines.…”

“…[12][13][14] In the calculation of electrothermal lifetime, the degree of Rearranging and integrating the governing equation with r replaced by V gives:…”