Traditional methodologies for calculating shortcircuit are strongly influenced by the influential parameters of the calculation, among them: Short-circuit power; Resistance and reactance of cables; Fault impedance. The vagueness of these parameters may compromise the setting protection and lead even to a complete lack of protection in some situations. This paper presents a methodology of calculation of the shortcircuit electrical currents in primary feeders which is based on the treatment of uncertainties of these parameters by Fuzzy Logic. This methodology was implemented in software whose main application is a fault location module that uses information from the electrical waveform records of events in distribution substations and topology data of primary feeders and their physical parameters.
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