Cálculo de correntes de curto-circuito e seletividade em instalações elétricas industriais

Abstract

The calculation of short circuit current is very important in the design of industrial electrical installations, and one of the main points considered in approving the project for the local power company is the selectivity of the protection system Electrical System Industrial (ESI) and protection system of the company. Many professionals in the field of electrical engineering do not perform the calculation of short circuit and selectivity of the system due to the complexity of the calculations. This academic work then provides the possibility of performing the calculation of short circuit currents and amperometric selectivity ESI quick and easy, requiring only the insertion of data to the algorithm of the electric system. This algorithm developed performs the calculation of short circuit currents and selectivity of EISs with different configurations, which have indefinite number of buses and circuits by bus. This paper presents the conceptual theory from short circuit and selective coordination until the final result of simulations using the algorithm, demonstrating calculation, with its complexities, and ease of use of the algorithm.