Measured Impedance by Distance Relay Considering Double Model of the Line Capacitance

Abstract

This paper investigate the measured impedance by distance relay considering the transmission line capacitance by utilizing a double pi model for the line. The distance relay ideal tripping characteristic is therefore presented. The measured impedance and the tripping characteristic are compared with those in the case of not considering the line capacitance. In the case of zero fault resistance, the deviation of the measured impedance from its exact value caused by the line capacitance is also investigated.