Estudo de seletividade e proteção de sobrecorrente na subestação de um complexo eólico

Abstract

This work presents the protection and selectivity study of the Pedra do Sal wind complex, where the parameterization of the protection settings for the collector substation (13.8kV/69kV) is proposed. First, the main concepts necessary for understanding the study of coordination and selectivity are presented. In addition, all the calculations of the main protection functions implemented (through the AREVA P142, AREVA P632 and AREVA P342 relays) will be addressed, ensuring the correct protection of the settings of the phase and neutral overcurrent protection functions and transformer differential protection. In addition, short-circuit simulations will be presented on the bars that make up the circuit in question for the parameterization of the protection devices, based on the obtained values of three-phase and single-phase short-circuit current, using the ANAFAS software. Finally, the phase and neutral Coordinateograms will be shown, based on the study results and protection settings, ensuring the selectivity and coordination of the system, based on the PTW software. In an explanatory and exemplified way, this work shows a case study carried out in a wind complex, using from the conceptual and initial theory of short circuit and coordination and selectivity, to the integration between two softwares and how we obtain a correct adjustment of protection in an electrical system of a wind farm composed of 20 wind turbines. As a result of this study and its adjustments, the selectivity and coordination of protection was ensured, as well as the presentation of coordenograms, single-line diagram of protection and settings of relay parameters.