AAA
NA30

PHASE&RESIDUAL OVERCURRENT, GROUND DIRECTIONAL, THERMAL IMAGE, RESIDUAL OVERVOLTAGE

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The relay type NA30 is typically used in radial MV networks as feeder or power transformer protection:

  • on long radial feeders in ungrounded or Petersen coil and/or high resistance grounded systems
  • on the LV side of parallel connected transformers with any grounding
  • as earth fault protection of parallel connected generators or generator-transformer unit on the same busbar

The relay complies with CEI-016 requirements.

NA30 - Pro-n ()

Specifications


Key:   standard standard optional optional alternative alternative


Applications

  • Feeder
  • Generator
  • Motor
  • Transformer

Protection functions

  • Pt100 thermometric probes (26)
  • Thermal image (49)
  • Phase overcurrent (50/51)
  • Residual overcurrent (50N/51N)
  • Residual overvoltage (59N)
  • Ground directional overcurrent (67N)
  • 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
  • Second harmonic restraint
  • Self-test
  • Trip circuit supervision (74TCS)

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

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