Influence of External Currents in Sensors Based on PCB Rogowski Coils.

Abstract

 A  current  sensor  based  in  the  Rogowski  coil  is  an  innovative measuring system that gives advantages with respect to    conventional    measuring    systems    based    in    current    transformers  with  magnetic  core  [1], [2].and [3].   Their  main  advantages are: the linearity, the span and the bandwidth. Different  kinds  of  manufacturing  allow  to  obtain  an  important  variety of Rogowski coils with different properties. One way of manufacturing  is  using  the  same  method  as  for  producing  printed  circuit  boards,  so  by  this  way  is  possible  to  produce  coils very similar and with a high precision. The   authors   are   working   in   current   measurement   with   Rogowski  coils  or  Hall  effect  sensors  and  in  particular  in  the  realization of good and accurate coils [4] and [5].In this work, the  influence  of  external  currents  to  the  coil  in  the  measured  current by the coil has been evaluated.