Spline function based technique for sensitizing of ground Overcurrent relays for sub-transmission and distribution lines

The sensitivity of the overcurrent relays is affected by the feed from the other end and the fault resistance. Both of these are unpredictable as these are dependent on the fault location and system conditions. This paper focuses on a novel technique for the sensitizing (enhancing the sensitivity ) of the ground overcurrent relays. The focus of the paper is to demonstrate the technique for a distribution system with double end feed. The results can be extended to radial systems without any loss of accuracy.