AAA
NM20

MULTIFUNCTION PROTECTION FOR LARGE SIZE MOTORS

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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.

NM20 - Pro-n ()

Specifications


Key:   standard standard optional optional alternative alternative


Applications

  • Motor

Protection functions

  • Pt100 thermometric probes (26)
  • Undervoltage (27)
  • Positive seq. undervoltage (27V1)
  • Reverse active overpower (32R)
  • Phase undercurrent (37)
  • Directional active underpower (37P)
  • Loss of field (40)
  • Negative sequence overcurrent (46)
  • Phase reversal (47)
  • Thermal image (49)
  • Phase overcurrent (50/51)
  • Residual overcurrent (50N/51N)
  • Locked rotor (51LR(48)/14)
  • Minimum power factor (55)
  • Overvoltage (59)
  • Residual overvoltage (59N)
  • Negative seq. overvoltage (59V2)
  • Maximum number of starting (66)
  • Ground directional overcurrent (67N)
  • Underfrequency & overfrequency (81U 81O)
  • High impedance restricted earth fault (87NHIZ)
  • Breaker failure (BF)

Monitoring and control functions

  • CB diagnostic
  • Cold Load Pickup (CLP)
  • CTs monitoring (74CT)
  • Digital Fault recording (DFR)
  • Fault and event logging (SER & SFR)
  • Logic selectivity
  • Multiple setting profiles
  • Programmable Logic Controller
  • Self-test
  • Trip circuit supervision (74TCS)
  • VTs monitoring (74VT)

Hardware

  • 2 binary inputs + 6 output relays + 8 LEDs
  • Auxiliary power supply 110-230 Vac/dc
  • Auxiliary power supply 24-48 Vac/dc
  • Flush, projecting, projecting, rack, with separate MMI
  • Network module with Ethernet FX port (optical fiber)
  • Network module with Ethernet TX port (copper RJ45) + RS485 port
  • Nominal current 1/5 A selectable by DIP-switch
  • RS485 port (unavailable with Ethernet FX port)
  • Standard CT amperometric inputs 1/5 A

Communication

  • IEC 61850 Protocol
  • Modbus RTU RS232 protocol
  • Modbus RTU RS485 / IEC 870-5-103 / DNP3 protocol
  • Modbus TCP/IP protocol (network board must be provided)