TY JOUR TI Experimental determination of external characteristics of AC traction substations for selection of parameters of active devices of traction power supply system KW traction power supply system KW traction substation KW external characteristic KW railway transportation KW energy efficiency JO Bulletin of scientific research results AU Komyakov, A.A. AU Tarasevich, V.A. PY 2024 IS 2024 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"