Analysis of the transformer inrush current in a hydro generator

The inrush currents related to the connection of generator devices is a typical matter of concern in situation with long distribution lines or/and under low short circuit power values at the PCC. This situation is usual for offshore devices. In this case, it is analyzed the magnetization current of the hydro generator developed by Magallanes Renewables supposed to be installed at the EMEC tidal test site. For this analysis, the surrounding network and the transformer has been modelled and simulated under different conditions (short circuit power, remanent flux...). The results show that the voltage depression related to that inrush current fulfills the regulation of the local regulations.