FIELD: electrical power engineering. SUBSTANCE: gear is intended for provision of reliability of long-distance redundancy which is achieved thanks to automatic putting of electric power line out of operation if it is overloaded under conditions of mutual supply and safety of operation of protection under optimum line end mode of asymmetric short-circuit and its transition to symmetric short-circuit across transformers of spur lines thanks to check of priority of closing of corresponding circuits of protection. EFFECT: improved reliability of protection. 2 dwg
