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In this paper we carried out dynamical modeling studies and analyzed of the three-phase three legged transformers of the laboratory. The unbalance and hysteresis phenomenon are also treated and two models are used, namely the T- and PI-models. The PI-model as developed by De-Léon et Al [14] in the EMTP simulator (Electro-Magnetic Transients Program) does not give good results. That is why we proceeded...
This paper proposes a new model of asymmetric three-phase three legged transformers for the simulation of transient operation. In the current literature, several models yield incomplete and inaccurate results, both in the steady-state and transient operations. Among all these models, the idea of using a PI model [5] seemed the most promising. We have improved the model by taking into account the fast...
This paper deals with to elaborate a model of single-phase core type transformer. The model uses the principle of duality based on corrections made to the Π-model. First, we will highlight modifications to already existing models, and a comparison between the Modified Π-model with the T and Π-models and experimentation will be made. The main interest of this model is to introduce of hysteresis loop...
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