FIELD: communications engineering; data transmission by high-frequency currents over distributed cable lines. SUBSTANCE: device has high-frequency toroidal-core transformer whose primary winding is connected on one end to communication equipment and on other, to ground circuit; secondary winding of high-frequency transformer is formed by passing conductor that grounds armor braid and metal sheath of power transmission cable through toroidal core that carries primary winding, current-carrying conductors of power transmission cable being connected to ground circuit through capacitors connected in series with inductance coils. EFFECT: reduced impact of input resistance of substation buses on high- frequency signal transferred. 1 cl, 1 dwg
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