TY JOUR TI Identification of Arc Processes in the Contact Network of Urban Electric Transport by Methods of Oscillographic Monitoring and Spectral Processing KW urban electric transportation KW overhead contact network protection KW short circuit KW energy recuperation KW monitoring JO Bulletin of scientific research results AU Agunov, A.V. AU Scherban', A.V. AU Arhipov, D.D. AU Kuznecov, A.A. AU Simonenko, K.D. PY 2026 IS 2026 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"