Starting from the core of a copper-wound transformer, we design a winding transformer in aluminum and compare the results obtained in Matlab’s Simulink simulation.Companies such as Rymel and ABB have implemented the construction of large power transformers with aluminum sheets, so it is important to propose a discussion about the subject for future research. This paper presents the design of an aluminum-wound transformer, showing the advantages and disadvantages of this material. The aluminum-wound transformer is 40% lighter and 30% larger compared to the copper-wound transformer. However, the heat dissipation presented by the aluminum winding is superior to that of a copper winding due to the cross section of the aluminum conductor and the coefficient of thermal conductivity.