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File Last modified on: Mon Jun 21, 2010 16:52:52
 
Device and method for mitigating magnetic core saturation in a current transformer
 

A device and a method for mitigating magnetic core saturation in a current transformer. The Primary Winding of the current transformer is connected to power system and protective relay system is connected to secondary winding of the current transformer. The device comprises a current sensor connected in series with secondary winding of current transformer and connected to input of analog measurement circuit. The output of analog measurement circuit is connected to control circuit. The output of control circuit is connected normally closed switch connected across the secondary winding. A compensating flux generating and injecting circuit is connected across the normally closed switch and normally open switch is connected in series with compensating flux generating and injecting circuit. The output of control circuit is further connected to normally open switch. The output of compensating flux generating and injecting circuit is connected to secondary winding of current transformer through normally open switch and closed switch.

Indian patent application no. 592/MUM/2008 Patent grant no.
Inventors: S A Soman, P R Apte, and P V Chawande