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NM20
Motor protection
The relay type NM20 can be used for protection of large size motors in MV systems.
For any grounded systems (solidly grounded, ungrounded or Petersen coil and/or resistance grounded) the protection can be used on feeders of any lenght.
FUNCTIONS
STANDARD PROTECTIVE & CONTROL ELEMENTS
Under Voltage - 27
Positive Sequence Undervoltage - 27V1
Directional active overpower - 32P
Under Current - 37
Directional reactive underpower - 37Q
Loss of Field - 40(M/G)
Negative sequence overcurrent Motor/Generator - 46M, 46G
Maximum number of startings (Restart inhibition) - 66
Ground directional overcurrent - 67N
Over frequency - 81O
Under frequency - 81U
Breaker Failure - BF
CT Supervision - 74CT
VT Supervision - 74VT
Trip Circuit Supervision - 74TCS
SW PACK OPTIONAL CONFIGURATION
Thermal with Pt100 Probes - 26
DOWNLOADS
PRO-N NM20 IEC 61850 Certificate
NM20 Manual