Over-current protection relay NA10

trip circuitACfor feeder

The relay type NA10 is typically used in radial HV, MV and LV networks as feeder or power transformer protection. In solidly grounded systems the residual overcurrent protection can be used on feeders of any lenght, while in ungrounded or Petersen coil and/or resistance grounded systems, the residual overcurrent protection can be used on feeders of small lenght in order to avoid unwanted trippings due to the capacitive current contribution of the feeder on external ground fault. The relay complies with CEI 0-16 requirements. STANDARD PROTECTIVE & CONTROL ELEMENTS • Phase overcurrent side H and side L • Maximum Residual Overcurrent • Automatic Recloser • Breaker Failure • CT Supervision • Trip Circuit Supervision SW PACK OPTIONAL CONFIGURATION • Thermal with Pt100 Probes Three phase current inputs and one residual current input, with nominal currents independently selectable at 1 A or 5 A through DIP-switches. Two or five binary inputs are available with programmable active state (active-ON/active-OFF) and programmable timer (active to OFF/ON or ON/OFF transitions). Several presettable functions can be associated to each input.