Setting and coordination of distance relays in interconnected power systems using DIgSILENT PowerFactory software

Maintaining selectivity among protective devices in interconnected power systems is of crucial importance. Therefore, it is necessary to install distance relays on both ends of the transmission lines to ensure efficient main and backup protection of the system. In this study, the zones and tripping time settings of distance relay for phase and ground protection of interconnected power systems are set and implemented in the professional DIgSILENT PowerFactory software. The interconnected test system IEEE 9-bus test system is used to validate the proposed methodology. The obtained results have approved that the setting and coordination of distance relays ensure adequate system protection against various fault types and locations.