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A new method to calculate very fast transient over-voltages (VFTOs) in transformer windings has been presented. The applied algorithm uses a hybrid model which is a combination of the multi-conductor transmission line model (MTLM) and the single-transmission line model (STLM). The voltages at the end of each coil are calculated with the STLM model. Then, these values are used in the MTLM to determine...