دانلود Detection of Partial Saturation and Waveform Compensation of Current Transformers

Abstract

Derivative-based approaches have been widely used for detecting  Current-Transformer  (CT)  saturation.  This  letter  proposes  an  efficient approach for detecting CT saturation with a generic discrimination index without a need for setting definition. For this aim, the simultaneous samples-based multiplication of the secondary current by  its  derivative  is  only  used  to  differentiate  between  saturated  and  unsaturated  wave  portions.  Reconstructing  of  the  detected  saturated secondary  current  is  done  using  Kalman  filtering  to  efficiently  extract the  phasor  quantities  of  the  unsaturated  current  portion.  The  results provide  evidences  of  the  efficacy  of  the  proposed  detector  and  of  the Kalman-based waveform reconstruction.