Viabilidade Técnico-Econômica de Alimentação de Cargas Rurais Isoladas através de Transformador de Potencial para Serviços Auxiliares (ASVT)

Abstract

A possible application of the Auxiliary Services Potential Transformer (ASVT), a device used for auxiliary services and protection, in rural electrification in villages and isolated farms close to Transmission Lines is presented. The main advantage of such use is that the installation cost is lower than a substation to feed loads, even though the individual financial investment of the ASVT is greater than that of a common commercial transformer. The work demonstrates the technical-economic viability of this application through the analysis of four implementation hypotheses, the first assuming single-phase power supply for a village or a farm close to a transmission line, the second considering three-phase power supply of the same load, making use of an AC/DC converter, the third being the three-phase medium voltage supply of a load located at a distance of 30 km from the transmission line, with converter, and the last hypothesis being the use of two transformers with a three-phase arrangement to supply the charge. The viability of the project was confirmed through the analysis of economic indicators, such as the NPV (net present value), the IRR (internal rate of return) and the return time on the initial investment, demonstrating the possibility of implementation.