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Littelfuse - Model SE-325 Series -Neutral-Grounding-Resistor Monitor
FromLittelfuse, Inc.
The SE-325 Neutral-Grounding-Resistor Monitor is 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 coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact.
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- Continuous NGR monitoring : Detects resistor failure within seconds, reduces transient-overvoltage risk, removes risk of groundfault-detection failure
- Ground-fault Detection : Main or backup protection to detect a ground fault anywhere on the monitored system
- Adjustable pickup (0.5-4 A) : Select greatest sensitivity without false operation
- Adjustable time delay (0.1-2 s) : Adjustable trip delay allows system coordination
- Output contacts : Form A output contact
- Selectable contact operating mode : Selectable fail-safe or non-fail-safe operating modes allows connection to shunt or undervoltage breaker coil or alarm system