Patent ID: 7372354
Filing Date: 2008-05-13
Classification: G01R

Abstract:
1. A detector circuit for measuring high current, the circuit comprising: a main current transformer; two substantially identical auxiliary current transformers each including an annular core, wherein magnetomotive forces are induced by a main current, said magnetomotive forces being counteracted by magnetomotive forces induced by a compensating current in a compensating winding across at least the two annular cores of the auxiliary current transformers at the same time as the two auxiliary current transformers are magnetized in antiphase by means of a modulation signal; and a synchronous rectifier for providing an adjustment signal for the compensating current; wherein the compensating winding for the compensating current across at least the two annular cores is comprised of a continuous conductive element wound to form a plurality of layers of the conductive element which are non-sequentially wound in relation to each other in such a manner that the potential differences between the plurality of winding layers are reduced to a minimum.