Over-voltage protection relay NA60

under-voltageACfor feeder

The relay type NA60 can be typically used in radial or meshed MV and LV networks as feeder or power transformer protection: on radial, ring and parallel feeders of any length in solidly grounded, ungrounded, Petersen coil and/or resistance grounded systems on parallel connected generators on the same busbar Moreover undervoltage and overvoltage functions are provided as protections or voltage controls. The NA60 relay can be can be shipped with circuits for input phase current suitable for traditional CTs and VTs, or combined ThySensor devices. STANDARD PROTECTIVE & CONTROL ELEMENTS • Under Voltage • Thermal Image Transformer • Phase overcurrent side H and side L • Maximum Residual Overcurrent • Overvoltage • Residual Overvoltage • Phase Directional Overcurrent (Voltmetric Permission) • Ground directional overcurrent • Breaker Failure • CT Supervision • VT 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 Athrough DIP-switches. • Three phase voltage inputs with programmable nominal voltages within range 50...130 V (UR =100 V) or 200...520 V (UR =400 V)and one residual voltage input, with programmable nominalvoltage within range 50...130 V (UER =100 V). • Three phase current inputs, with 630 A nominal current (primary). • One residual current input, with nominal currents independently selectable at 1 A or 5 A through DIP-switches. • Three phase voltage inputs with nominal voltage 20/√3 kV (primary); the residual voltage has been obtained by vector calculation measures of phase voltages