The relay type NVA100 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 and transformer on the same Busbar. • In HV, MV and LV electrical machines and network, load shedding and separation of active users from the grid.
Specifications
Key: standard optional alternative
Applications • Feeder • Utilities interconnection Protection functions • Overflux (V/Hz) (24) • Pt100 thermometric probes (26) • Undervoltage (27) • Positive seq. undervoltage (27V1) • Directional active overpower (32P) • Directional reactive overpower (32Q) • Directional active underpower (37P) • Directional reactive underpower (37Q) • Negative sequence overcurrent (46) • Thermal image (49) • Phase overcurrent (50/51) • Residual overcurrent (50N/51N) • Voltage-controlled overcurrent (51V) • Minimum power factor (55) • Overvoltage (59) • Residual overvoltage (59N) • Negative seq. overvoltage (59V2) • Phase directional overcurrent (67) • Ground directional overcurrent (67N) • Automatic reclosing (79) • Frequency rate of change (81R) • Underfrequency & overfrequency (81U 81O) • High impedance restricted earth fault (87NHIZ) • Breaker failure (BF) • Phase interruption under low-load condition (I2/I1) Monitoring and control functions • CB diagnostic • Cold Load Pickup (CLP) • CTs monitoring (74CT) • Digital Fault recording (DFR) • Fault and event logging (SER & SFR) • Logic selectivity • Multiple setting profiles • Programmable Logic Controller • Second harmonic restraint • Self-test • Trip circuit supervision (74TCS) • VTs monitoring (74VT) Hardware • 100 V standard voltage inputs • 2 binary inputs + 6 output relays + 8 LEDs • 400 V standard voltage inputs • Auxiliary power supply 110-230 Vac/dc • Auxiliary power supply 24-110 Vac/dc • Flush, projecting or rack mounting • Flush, projecting, projecting, rack, with separate MMI • Network module with Ethernet FX port (optical fiber) • Network module with Ethernet TX port (copper RJ45) + RS485 port • Nominal current 1/5 A selectable by DIP-switch • RS485 port (unavailable with Ethernet FX port) Communication • IEC 61850 Protocol • Modbus RTU RS232 protocol • Modbus RTU RS485 / IEC 870-5-103 • Modbus RTU RS485 / IEC 870-5-103 / DNP3 protocol • Modbus TCP/IP protocol (network board must be provided)
