NV021

Loss of mains protection

The relay type NV021 can be typically used in LV distribution systems, on transformers or for electrical machines.
It can be used for system decoupling, load shedding and loss of main (islanding) protection.
The relay complies with CEI 0-21 requirements.

FUNCTIONS


STANDARD PROTECTIVE & CONTROL ELEMENTS

  • Under Voltage - 27
  • Positive Sequence Undervoltage - 27V1
  • Overvoltage - 59
  • Residual Overvoltage - 59N
  • Overfrequency - 81O
  • Underfrequency - 81U
  • Frequency rate of change - 81R
  • Breaker Failure - BF
  • Trip Circuit Supervision - 74TCS
  • Negative sequence overvoltage - 59V2
  • Average overvoltage - 59Uavg
  • Sequence of Fault Recorder (SFR)
  • Sequence of event Recorder (SER)

SW PACK OPTIONAL CONFIGURATION

  • Digital Fault Recorder (DFR)
HW PACK OPTIONAL CONFIGURATION
  • Thermal with Pt100 Probes - 26

COMMUNICATION FUNCTIONS

  • Modbus TCP-IP
  • One USB Type B local port for communication with ThyVisor setup software
  • Modbus protocol RTU RS485 / IEC 870-5-103 / DNP3
  • IEC61850 Ed.1 & Ed. 2

DOWNLOADS

NV021 Manual
Flyer NV021
NV021 Coding
PRO-N NV021 IEC 61850 Certificate

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