Dielectric design methodology of power transformers based on the cumulative stress method

The complexity of the dielectric design of the oil isolated power transformer increases with the voltage amplitude applied to the equipment. For a project with a dielectric safety margin and adequate manufacturing costs, it is necessary to develop a design methodology for all transformer points for any voltage and power levels. This work proposes a methodology for the dielectric design and calculation of the insulation safety margin of the connection elements external to the windings. The method is based on numerical computer simulations using the Finite Element Method (FEM) and the Cumulative Stress Method (CSM).