Voltage compensation circuit for heavy current cable - has logic circuit controlling switching of tappings of several stepped transformers

摘要

The heavy current cable effects a communication cable and carries a voltage with a large number of strong harmonics. The interfering voltage is collected from a wire of the communication cable, amplified and applied to a logic circuit which switches electronically and contactlessly tappings of the secondary winding of one or several stepped transformers. A compensation voltage from the secondary winding is applied with correct phase to the cable sheath and/or a wire inside or outside the cable. The primary windings of the transformers are supplied by the interfering network.