FIELD: electrical engineering; signal transmission over three- phase power transmission line. SUBSTANCE: system has passive-active transmitter at controlled station and at control-center receiving station it has three current transformers, reverse-sequence symmetrical component current filter, two receivers, three piezoelectric transducers, and forward- sequence symmetrical component current filter. System provides for disabling undesirable signal takeoff from secondary windings of current transformers. EFFECT: provision for signal takeoff from piezoelectric transducers. 2 dwg _
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