Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Résumé

This paper describes the comparison between volume and surface approaches to compute electric field and temperature distributions along the stress-grading system on Stators Bars (Roebel Type) under 60 Hz sinusoidal ac voltage. For the surface approach, a specific boundary condition available in the commercial FEM software Comsol Multiphysics® was used to model the stress-grading system whereas for the volume approach, the thickness of each component is taken into account. The investigations were focused on the comparison of the axial electric field and surface temperature distributions along the stress-grading system using 2D axisymmetric FEM model of a stator bar (Roebel Type). The results obtained demonstrate that the surface approach can be a good alternative to the volume approach to compute the electric field and temperature distributions along the stress grading system. Thus, the numerical surface approach study provides an alternative to calculate the axial electric field and surface temperature distributions along the stress-grading system without numerical instability. In addition, the numerical results obtained using surface approach was confirmed experimentally.