FIELD: electronics; telemechanics systems using power transmission lines as communication channels without processing. SUBSTANCE: method involves synchronous signal detection to multiplex frequency band allocated for communication channel in three-phase, 0.38, 10, or 35 kV three-phase power transmission line. Device implementing this method has transformer 1, two voltage symmetrical-component filters 2,3, two narrow-band filters 4,5, balanced phase detector 6, mixer 7, low-frequency filter 8, diode bridge 9, differential-frequency filter 10, and phase shifter 11. EFFECT: reduced cost of signal transmission links. 2 cl, 1 dwg
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