NV021

Grid interconnection 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
  • Negative sequence overvoltage - 59V2
  • Residual Overvoltage - 59N
  • Over frequency - 81O
  • Under frequency - 81U
  • Frequency rate Change - 81R
  • Breaker Failure - BF
  • Trip Circuit Supervision - 74TCS
SW Pack optional configuration
  • Thermal with Pt100 Probes - 26


COMMUNICATION FUNCTIONS

  • One USB Type B local port for communication with ThyVisor setup software


DOWNLOADS

Flyer
Manual
Coding

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