Protección diferencial de transformadores de potencia mediante técnicas basadas en la transformada wavelet

Abstract

When a power transformer is connected to the grid, the primary currents through windings are very high in relation to the assigned current due to the transient phenomenon of creation of the magnetic field inside the machine as well as to the core saturation. This phenomenon has several negative effects, one of which is the untimely tripping of the differential protection of the transformer. This thesis has as main objective the development of a transformer differential protection system that prevents unwanted tripping of the protection in the energization of the transformer using the wavelet transform as a method of discrimination of inrush currents. For this purpose, a complete differential relay model is developed that is subjected to behavioral testing of different operating situations of the power transformer. The model and all the tests are made using the Matlab / Simulink computer tool