Algoritmo para cálculo de correntes de curto-circuito em sistemas elétricos

Abstract

The Transformers, between substation’s components, have a high value, and, for that reason, they have a quite criteria protection system made by many forms, between these, short- circuit’s instantaneous overcurrent.The short-circuit analysis is due to parametrization to promote system protection and coordenation. Therefore others analysis are riquired such as: Th ́evenin’s impedance; monofase; two-fase; and three fase short circuit and the others source’s contributions to short-circuit. The system configuration can became complex to analysis, mainly to current’s contributions growing in geometrical scale. As a result, an algoritm was developed to performs the short-cirtuit’s calculations and shows the results. The methodology was developed in a way that input data can be by Microsot Office Excel, as so the outputs of the results of short-cicuit’s and current’s contribuitions. The matrices sizes is due to equivalants circuits of positive, negative a zero sequences, shown in methodology chapter, transformations and calculos being necessary to validate the models executed in MathWorks MATLab. The algorithm results were validate with a generic short-circuit study problem, shown in results and discussion chapter. They showed low errors in doing so the conclusion were that the developed algorithm can help in short-circuit calculos in any alement os power eletrical system that may be reproduce with equivalent circuits as like this study. All in all, the algorithm is available at:https://github.com/Conticaio/do, for future studies is suggest to introduce angular lag, phases decomposistions in short-circuit studies and integration with fotovoltaica sources.