High-Impedance Earth-Fault Detection Algorithm

This technical report outlines the development and implementation of a new high-impedance earth-fault algorithm by S&C Electric Company for use with their IntelliRupter PulseCloser Fault Interrupters. The document details Evoenergy's challenges in detecting high-impedance earth faults, particularly in the context of Australia's bushfire season, which necessitates effective bushfire-mitigation strategies. It describes how traditional Sensitive Earth Fault (SEF) protection methods were inadequate due to their reliance on high fault currents, which could ignite vegetation. The report explains the collaboration between Evoenergy and S&C to create an operating logic map for the IntelliRupter devices, enabling them to detect faults with lower current levels. The testing process, including simulations and field tests, is documented, demonstrating the algorithm's precision and effectiveness. The report concludes with the successful deployment of the IntelliRupter devices, which have been approved by Australian regulators, enhancing Evoenergy's network reliability and resilience against bushfire risks.