Abb Schweiz Ag

Abb Research Ltd.

Centre National De La Recherche Scientifique

Abb Technology Ag

L'universite De Strasbourg

Jean-Baptiste Kammerer

Joris Pascal

Yannick Maret

Rolf Disselnkötter

Simon Paulus

The invention is about a current transducer of the Rogowski type, with a primary conductor winding having a first number of loops (N) for carrying the rated current (I) to be measured, with a secondary conductor winding having a pair of second terminals and a helical shape and a second number of loops (N), said secondary conductor winding encircling the primary conductor in a toroidal manner, whereby a rated current voltage signal Vis induced between the pair of second terminals of the secondary winding, said rated current voltage signal being characteristic for the derivative of the rated current (dI/dt), with a transducer electronics (IED) configured to receive the rated current voltage signal (V), characterized in that the current transducer comprises a third conductor winding having a pair of third terminals with a third number of loops (N), whereby the transducer electronics (IED) is configured to feed a calibration current signal (I) into the third conductor winding, whereby in response to the derivative of the calibration current signal (dl-/dt) an additional calibration signal (V) is created between the pair of second terminals of the second winding and whereby the transducer electronics (IED) is configured to process the rated current voltage signal (V) and the calibration signal (V) to derive a corrected voltage signal (V) with a calibrated sensitivity S.

Current transducer of the Rogowksi type and arrangement for measuring a current

A current measurement device for measuring a current through a primary conductor is provided. The current measurement device comprises a current transducer of the Rogowski type, the current transducer comprising a conductor winding connected to a pair of transducer terminals and adapted to induce there between a measurement voltage indicative of a current through the primary conductor; a pair of calibration terminals adapted for providing a calibration current to a calibration current path conforming to the primary conductor, so that the calibration current induces a calibration response voltage component between the pair of transducer terminals; and a control circuit. The control circuit comprises a calibration current generator for generating the calibration current and connected to the pair of calibration terminals for providing the calibration current via the pair of calibration terminals to the calibration current path, and a voltage analyzer connected to the pair of transducer terminals for receiving the calibration response voltage component induced between the pair of transducer terminals.

Current measurement device and method using a Rogowski type current transducer

Growing community of inventors

Lochwiller, France

Jean-Baptiste Kammerer