As shown in the illustrated alternator protection scheme diagram, under what circumstances would an earth leakage relay (EL) be used? EL-0067

Correct Answer: Option D — in high voltage systems with a high impedance earthing resistor or transformer

High-voltage marine distribution systems above 1kV utilize high-impedance earthing resistors or grounding transformers to limit single-phase-to-ground fault currents. Earth leakage relays tuned to these systems detect small leakage currents without causing immediate, hazardous voltage spikes.