Investigation of ferroresonanse phenomena and its possibilities of occurrence in the operation of 6-220 kV electromagnetic transformerAndrew Tychkin, Andrew Yablokov, Vladimir Lebedev, Nikita Rodin and Maksim BatmanovE3S Web Conf., 288 (2021) 01058DOI: https://doi.org/10.1051/e3sconf/202128801058