ABSTRACT This investigation addresses the effect of particulate additives on the electrical breakdown strength of the oil impregnated insulation paper system. The morphological complexity is addressed by converting data from scanning electron microscope images to a data set suitable for numerical simulation analysis. Then, by using the conventional oil‐triggered breakdown assumption, the breakdown strength of the proposed hybrid insulation system was calculated. As a result, it demonstrates that the introduction of particles can redefine the electric field distribution in the hybrid insulation system under study. Consequently, a higher applied voltage is needed for the electrical breakdown to occur in the hybrid system with proper selection and addition of particles. This analysis method builds on the existing understanding of the electrical breakdown phenomena for oil impregnated insulation paper system, explains recent experimental data and supports improvements of material design in the future.
Xu et al. (Fri,) studied this question.