Ground Fault Protection of Microgrid Interconnection Lines Using Distance Relay with Residual Voltage Compensation

Protection of utility feeders that supplies an ungrounded/impedance-grounded Microgrids (MGs) or Distributed Energy Resources (DERs) is a challenging task, especially for Single-Line-to-Ground (SLG) faults. Normally, the interconnection line can be protected using: (i) a Direct Transfer Trip (DTT) from the utility station and/or (ii) an over-voltage relay (59G) energized by a broken-delta potentia...