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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.
- Continuous NGR monitoring
- Ground-fault detection
- Adjustable pickup (0.5–4 A)
- Adjustable time delay (0.1–2 s)
- Output contacts
- Selectable contact operating mode
- Detects resistor failure within seconds, reduces transient-overvoltage risk, removes risk of ground-fault detection failure
- Main or backup protection to detect a ground fault anywhere on the monitored system
- Select greatest sensitivity without false operation
- Adjustable trip delay allows system coordination
- Form A output contact
- Selectable fail-safe or non-fail-safe operating modes allow connection to shunt or undervoltage breaker coil or alarm system
SE-325 Parts
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SE-325 Applications
- Resistance-grounded systems up to 25 kV
