Estudo da eficiência do índice de aproveitamento de subestações como parâmetro para incremento de potência de transformadores

Abstract

The 2031 Ten-Year Energy Plan points to an average annual growth of 3.5% in energy consumption by users, therefore, it is necessary to constantly reassess the equipment present in active substations. The expansion of the electricity companies’ infrastructure must take place in accordance with the growth in demand at each substation and also be in line with the rules of the Agência Nacional de Energia Elétrica (ANEEL). In this work, the expansion of substations was analyzed within the horizon of 2022 to 2042, by comparing the substation utilization index (IAS) with the useful life of transformers, through two scenarios, one of which foresees the expansion of the substation based on in the calculation performed using the IAS formula introduced by normative regulation 1003/2022 and the other scenario provides for expansion with a transformer that will serve until the end of its useful life. In this work, two hypotheses are also adopted for the acquisition of this equipment, one of them foresees the expansion through a transformer while the other divides the total power in two equal equipments. It is expected that the useful life method has a lower total cost and less need for intervention during the analysis period, while the IAS method should have a higher total cost of both equipment and labor. Through simulations, it was seen that despite the higher cost by the IAS method, the assets still maintained value during their replacement, só at the end of the analysis this method presented greater added value, validating the use of IAS as a parameter for substation expansion.