Análisis de los sobre voltajes en sistemas de transmisión con discontinuidades determinadas por líneas aéreas, cables y subestaciones aisladas en SF6, usandoATP-EMTP. análisis de los sobre voltajes por impulso atmosférico en subestaciones aisladas en SF6, alimentadas por líneas aéreas y las implicaciones en la protección del transformador, usando ATP-EMTP.

Abstract

This Curricular Integration Work (TIC) is framed in the theory of traveling waves in electrical systems with discontinuities, atmospheric discharges, line and tower models, gas insulation, lightning rods, and SF6 (sulfur hexafluoride) insulated substations. To study the effect of electromagnetic transients in systems with discontinuities, a model representing a 7-span transmission line with a discontinuity is proposed, which consists of an SF6 insulated substation, which allows studying the behavior of overvoltages due to atmospheric discharges; this allows to study the behavior of overvoltages due to atmospheric discharges, either in the towers or guard cables and phase conductors, in this way it will be possible to understand their behavior as traveling waves through the electrical system, all this to determine the voltage magnitudes at the terminals of a transformer and evaluate the usefulness of placing lightning arresters to protect it from overvoltages. The analysis is carried out using the software specialized in electromagnetic transients ATP (Alternative Transient Program), making use of the predetermined models that this simulation tool has, these models will be integrated into the base system of study for this work, so this TIC presents the proposed methodology to determine the various parameters of each model. Finally, this TIC presents the simulation of the system with discontinuity proposed for different cases of study, in which the obtained results are analyzed, and based on these, relevant conclusions are obtained about the system's behavior in front of atmospheric discharges.