An electronically enhanced magnetic core for current transformers

Summary form only given. An electronic technique which greatly increases the apparent permeability of a magnetic core of a current transformer without a galvanic connection to either of the usual primary or secondary winding circuits is described. The number of turns and the turns ratio can be selected independently as desired. Means are available for examining the waveform of the magnetizing current for the presence of even harmonics, thus indicating possible remanence or direct currents in the windings. Application of the technique to transformer voltage dividers is also discussed.<>