TY JOUR TI Innovative Approach to the Creation of Power Transformer Theory KW transformer KW primary and secondary windings KW magnetic flux KW equivalent circuit KW short circuit KW idling KW magnetizing current KW vector diagram JO Bulletin of scientific research results AU Shakirov, M.A. AU Tkachuk, A.A. PY 2022 IS 2022 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"