Estudo de proteção e seletividade de uma subestação destinada a uma usina de minigeração fotovoltaica

Abstract

The present work aims to define a study of coordination and selectivity of the protection for a substation taking in account the insertion of an electric power solar energy, into a distribution grid, of an electric energy concessionaire. From the case study methodology, the adjustments of the electrical protection elements established in national and district standards for the project carried out were calculated. The work script begins with the presentation of concepts and theories about equipment and protection devices commonly used in substations. To define the contracted demand, the elements that make up the mini generation are defined, and thus the power of the substation and the transformer to be installed are defined. Then, the protection study is carried out based on connection data provided by the electric power company of the installation site of the photovoltaic plant. Finally, through the coordination chart, it is verified if the system is selective and the coordination of the calculated protections. It can be concluded that the calculated protections meet the concessionaire's standards, thus protecting the power supply circuit and the plant's devices, in a coordinated way, avoiding undue actions on the concessionaire's feeder.