Impact of Geomagnetically Induced Currents Secondary Event on the High-Voltage Synchronous Motors

Copyright © 2013 Vera V. Vakhnina, Aleksey A. Kuvshinov. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. It is justified that during geomagnetic storms the high voltage synchronous engines are being impacted by high current harmonics of even sequences powered by power transformer due to geo-induced high voltage currents flowed through the windings. Equivalent circuits of step down substation and HV synchronous motors are made for making it possible to consider a saturation of power transformer magnetic system and higher current harmonics availability in stator wind-ings. Analytic expressions for higher current harmonics and extra capacity losses calculation in stator windings are re-ceived, as well as the calculation of induction torques allowing to denote a rate of geomagnetic processes impact on synchronous engine operation at various step down substation parameters