High-impedance fault detection and localization in distribution feeders with microprocessor based devices

An accurate electrical model for a HIF is implemented to investigate typical patterns in the line´s current that allow for the detection of these faults. Based on the implemented model an algorithm is proposed to detect and localize the occurrence of HIFs using present recloser/sectionalizer technology. The detection algorithm is presented showing the decision criteria for HIF declaration and its discrimination against nominal behavior in distribution feeders of similar harmonic content.