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Functions:
Detects neutral-grounding-resistor failure - NGR failure renders current-sensing ground-fault protection inoperative
Detects ground faults
Controls pulsing-ground-fault system
Data logging with PC software
Features:
Continuously measures NGR resistance
Wide set-point ranges - compatible with any neutral-connected NGR up to 72-kV system voltage
Calibrates to NGR resistance
4-20 mA output for earth-leakage metering
DFT (harmonic) filter prevents false operation
Trip delay to coordinate with downstream ground-fault relays
Standard RS-232 interface
Optional DeviceNet, PROFIBUS, and Ethernet communications
Four output relays for control and indication
Conforms to CSA Standard M421-00 Use of Electricity in Mines
Meets the requiremens of the Pennsylvania Bureau of Mine Safety
Free SE-MON330 PC-interface software
Conformally coated circuit boards
Five year warranty
Typical Applications:
Resistance-grounded transformers and generators in processing, manufacturing, chemical, mining, forestry, petroleum, and water treatment facilities
Tripping and alarm-only resistance-grounded systems, including overhead line and pulsing-ground-fault applications
Compatible with very high and very low resistor values
NGR monitoring is recommended for all resistance-grounded systems
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