FIELD: electrical engineering; signal transmission over three- phase power transmission lines. SUBSTANCE: method involves conversion of commercial- frequency F supply voltage U(t) into reverse-sequence signal current I(f1) at frequency f1 and forward-sequence signal current I1(f2) at frequency f2, where f2 f1 = 2F, at controlled point in transmission center, transmission of these currents over supply mains to reception point of control center, conversion of mentioned currents to mechanical vibrations and then to electrical oscillations, filtering, amplification of voltage amplitudes, and separation of respective voltages in desired frequency band. Proposed method 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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