Analysis of the Influence of Fault Resistance and SIR on the Distance Relay

This article proposes to verify the influence of fault resistance on the digital distance relay.To this end, a series impedance line (short line) of 230 kV was used for the simulations considering fault resistance values ranging from 5 ohms to 25 ohms.Furthermore, the SIR variation (0.2, 3, 12.75) was also taken into account in order to verify the impedance path for these boundary conditions.The experimental data and results show that the impedance behavior seen by the relay and the overreaching phenomenon caused by the increase in fault resistance.