The NVA100X-G protection relay integrates a number of functions required for the protection of generators. It may beused in power stations from gas, steam, hydraulic turbine, or diesel driven generators, operating in parallel with the public network and/or in island and with any neutral state and network layout.
All the faults associated to generators can be classified as either insulation failures or abnormal conditions. An insulation failure will result in either an interturn fault, phase to phase fault or an earth fault bringing the winding into direct contact with the core. NVA100X-G provides high level protection and a wide range of possible settings to configure the adopted protection scheme. The fundamental problems affecting the choice of motor protection are independent on the type of the connected load. NVA100-G provides the widest covering for typical problems like heating of motor windings, overload protection, motor current during starting and stall conditions, stalling of motors, unbalanced supply voltages, sequence of the current and stator protection.
Specifications
Key: 
standard 
optional 
alternative
Applications
- Generator
- Motor
Protection functions
- Overflux (V/Hz) (24)
- Pt100 thermometric probes (26)
- Undervoltage (27)
- Positive seq. undervoltage (27V1)
- Directional active overpower (32P)
- Directional reactive overpower (32Q)
- Phase undercurrent (37)
- Directional active underpower (37P)
- Directional reactive underpower (37Q)
- Loss of field (40)
- Negative sequence overcurrent for Generator (46G)
- Negative sequence overcurrent for Motor (46M)
- Phase reversal (47)
- Thermal image for Motor / Generator (49MG)
- Phase overcurrent (50/51)
- Calculated residual overcurrent (50N(Calc)/51N(Calc))
- Residual overcurrent (50N/51N)
- Locked rotor (51LR(48)/14)
- Voltage-controlled overcurrent (51V)
- Minimum power factor (55)
- Overvoltage (59)
- Residual overvoltage (59N)
- Negative seq. overvoltage (59V2)
- Maximum number of starting (66)
- 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