The increasing amount of the dispersed generation (DG) requires a protection for Anti-islanding based on the Voltage-Frequency functions. Thanks to NVA100X-V is possible to disconnect the DG in case of abnormalities in voltage or frequency, if one or more phases are disconnected from the grid supply, rapidly disconnecting from the network before the first reclosing shot. Protection strategies for this application are divided into these two categories passive methods and communication-based methods which are completely covered by the NVA100X-V.
Specifications
Key: 
standard 
optional 
alternative
Applications
- Bus
- Feeder
- Transformer
- Utilities interconnection
Protection functions
- Overflux (V/Hz) (24)
- Pt100 thermometric probes (26)
- Undervoltage (27)
- Positive seq. undervoltage (27V1)
- Phase undercurrent (37)
- Negative sequence overcurrent for Line / Transformer (46LT)
- Phase reversal (47)
- Thermal image for Line / Transformer (49LT)
- Phase overcurrent (50/51)
- Calculated residual overcurrent (50N(Calc)/51N(Calc))
- Residual overcurrent (50N/51N)
- 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)
- Vector jump (DPHI)
- Phase interruption under low-load condition (I2/I1)
Monitoring and control functions
- CB diagnostic
- Check synchronizing relay (25)
- Cold Load Pickup (CLP)
- CTs monitoring (74CT)
- Digital Fault recording (DFR)
- Fault and event logging (SER & SFR)
- Fault Locator (FL)
- 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
- 16 binary inputs + 16 output relays + 16 LEDs + IRIG-B
- 16 binary inputs + 16 output relays + 24 LEDs + 8 Pt100
- 16 binary inputs + 8 output relays + 16 LEDs
- 19/2-inch “4U” rack mounting
- 32 binary inputs + 16 output relays + 16 LEDs
- 400 V standard voltage inputs
- Auxiliary power supply 110-230 Vac/dc
- Auxiliary power supply 24-48 Vac/dc
- Flush mounting
- Front Ethernet port for local interface
- Nominal current 1/5 A selectable by DIP-switch
- One TX (RJ45) port + one FX (optical port) port + RS485
- Standard CT amperometric inputs 1/5 A
- Two FX (optical fiber) port + RS485
- Two TX (RJ45) port + RS485
Communication
- IEC 61850 Protocol
- Modbus RTU RS485
- Modbus RTU RS485 / IEC 870-5-103
- Modbus RTU RS485 / IEC 870-5-103 / DNP3 protocol
- Modbus TCP/IP Protocol
- Modbus TCP/IP protocol for local interface