TY JOUR TI DEVELOPMENT OF OPERATIONAL DIRECT CURRENT SYSTEMS WITH INTELLECTUALIZATION OF RELAY PROTECTION AND AUTOMATION MEANS KW DC operational systems KW electrical substations KW intellectualization KW electric power facilities KW digitalization JO Modern Technologies and Scientific and Technological Progress AU Konovalov, Y.V. AU Ivanov, I.S. AU Marchenko, D.A. AU Budnikov, N.L. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»