TY JOUR TI Increasing the Efficiency of Grounding the Overhead Catenary Supports on AC Railway Sections KW Contact network KW alternating current (AC) KW grounding KW group grounding cable KW resistance to dissipation KW electrical safety KW ungrounded supports KW relay protection KW potential distribution JO Bulletin of scientific research results AU Kremlev, I.A. AU Salita, E.Y. AU Terehin, I.A. PY 2025 IS 2025 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"