SYSTEM AND METHOD FOR LOCATING A FAULT ON UNGROUNDED AND HIGH-IMPEDANCE GROUNDED POWER SYSTEMS

摘要

A fault is located in a power distribution system 10 having a line frequency. The power distribution system includes a plurality of phases, at least one feeder, and each feeder includes at least one segment. The fault is located by detecting a faulted phase from the plurality of phases of the power distribution system 10. A measurement signal 230 having a measurement frequency is injected into the detected faulted phase, the measurement frequency being a different frequency than the line frequency. The fault location is determined for a selected segment based on at least one measured residual current corresponding to the injected signal and a predetermined relative impedance of the power distribution system 10.