TY JOUR TI Protected Approaches to Power Supply Inputs of Railway Automation and Remote control Devices under Lightning Strikes KW lightning strike KW mathematical model KW protected approaches KW impulse overvoltages KW railway automation and remote control JO Transport automation research AU Solov'ev, A.D. PY 2026 IS 12 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"