Grounding resistor monitoring system SE-325 series

transformerground fault

The SE-325 series is a neutral-grounding-resistor monitor used on resistance-grounded systems up to 25 kV to monitor the integrity of the neutral-to-ground path and to detect ground faults. It measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor (NGR). The SE-325 monitor coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact. Features Continuous NGR monitoring Output contacts Ground-fault detection Adjustable pickup (0.5–4 A) Adjustable time delay (0.1–2 s) Selectable contact operating mode