Filter capacitor banks consist of capacitor bank and series connected air core. Their task is to absorb the harmonic currents generated by loads and all above mentioned power electronic devices.
The capacitor banks may be internally/externally fused or fuseless capacitor units. The NVA100X-C relay provides protection of shunt capacitor banks and harmonic filter circuits with following configurations:
- Single Wye grounded or ungrounded
- Double Wye ungrounded or ungrounded
Specifications
Key: 
standard 
optional 
alternative
Applications
- Bank capacitor / harmonic filter
Protection functions
- Pt100 thermometric probes (26)
- Undervoltage (27)
- Phase undercurrent (37)
- Negative sequence overcurrent (46)
- Neutral unbalance overcurrent with inherent unbalance compensation (46N)
- Phase unbalance (46U)
- Thermal image (49)
- Phase overcurrent (50/51)
- RMS phase overcurrent (50/51(RMS))
- Calculated residual overcurrent (50N(Calc)/51N(Calc))
- Residual overcurrent (50N/51N)
- Overvoltage (59)
- Peak overvoltage (59H)
- Residual overvoltage (59N)
- Negative seq. overvoltage (59V2)
- Ground directional overcurrent (67N)
- Underfrequency & overfrequency (81U 81O)
- Breaker failure (BF)
- Phase interruption under low-load condition (I2/I1)
- Discharge Timer (TD)
Monitoring and control functions
- CB diagnostic
- Cold Load Pickup (CLP)
- CTs monitoring (74CT)
- Digital Fault recording (DFR)
- Fault and event logging (SER & SFR)
- Multiple setting profiles
- Programmable Logic Controller
- Second harmonic restraint
- Self-test
- Total Harmonic Distortion of phase currents (THD-I)
- 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
- 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, projecting or rack mounting
- Front Ethernet port for local interface
- Nominal current 1/5 A selectable by DIP-switch
- Nominal current 1/5 A selectable by DIP-switch
- One TX (RJ45) port + one FX (optical port) port + RS485
- RS485 port
- 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