Transformer protection

The differential current relay type NT10 is intended for the protection of two-winding power transformers, auto-transformers, generator- transformer units and short lines. No matching CTs are required.


Standard Protective & control elements
  • Under Current
  • Negative sequence overcurrent transformer
  • Negative /positive sequence current ratio
  • Thermal Image Transformer
  • Phase overcurrent side H and side L
  • Maximum Residual Overcurrent
  • Low impedance restricted earth fault
  • Double slope biased differential for Generator/ Motor/Transformer
  • Breaker Failure
  • Trip Circuit Supervision
SW Pack optional configuration
  • Thermal with Pt100 Probes