Modeling of the saturation curve of power transformers for eletromagnetic transient programs

This paper presents a method to model the saturation curve of power transformers and its impact to power system simulation studies. Thus, the article addresses the particularities of the proposed method (based on field measurements) compared to others found in the literature, especially the treatment of voltage signal and the residual flux. In addition, it shows a simulation study carried out in order to validate the proposed method. Finally, the authors apply the proposed procedure to obtain the saturation curve of a 150MVA power transformer during energization. From the analysis of the measurement results and simulation, it is possible to observe significant differences between the original curve (manufacturer curve) and the proposed curve.