TY JOUR TI ANALYTICAL EXPRESSION OF THE BUS ADMITTANCE MATRIX OF THE TRANSFORMER WITH THE SCHEME OF THE WINDING CONNECTION «STAR - STAR» KW transformer KW emergency operation KW asymmetrical operation KW method of phase coordinates KW bus admittance matrix KW scheme of winding connection KW analytical expression JO Bulletin of KSAU AU Soldatov, V.A. AU Chebesov, E.A. PY 2015 IS PB Krasnoyarsk State Agrarian University