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