Abstract

The high voltage power transformer is the supreme section of the power system network. The transformers' dependability and consistency are the most important criteria for the power system networks since the transformer failure may result in high capital loss. Failures occur due to various reasons, which include areas of failure in windings, bushings, tap-changers, core, tank, protection system, cooling system, etc. Finite element modeling can help design power transformer and understand the severe condition of defects while considering real-life conditions. Finite element method (FEM) is used to simulate and investigate power transformer insulations with partial discharge activities. FEMs provide more accurate representation of complex geometries because they consider thermal, electrical, and environmental influences on the insulation models to obtain basic characteristics of the insulation system during normal and partial discharge conditions. The defects have been taken into account are bubbles, cellulose, and metallic defects in the oil and voids and cracks in pressboard insulation. The aim of this paper is to design and analyzing the transformer's defect in the time domain. The electric field is estimated in healthy as well as for the defective transformer.

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