The NTGP digital protection relay integrates a number of functions required for the protection of generators. It is used 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.
Additional modules (26 and 64F protections and hardware I/O) are available as option.

Specifications

Key: standard optional alternative

Applications
• Generator
Protection functions
• Underimpedance (21)
• Overflux (V/Hz) (24)
• Pt100 thermometric probes (26)
• Undervoltage (27)
• Third harmonic undervoltage (27H)
• Directional active overpower (32P)
• Reverse active overpower (32R)
• Directional active underpower (37P)
• Loss of field (40)
• Negative sequence overcurrent (46)
• Thermal image (49)
• Inadvertent energizing (50+27)
• Phase overcurrent (50/51)
• Residual overcurrent (50N/51N)
• Voltage-controlled overcurrent (51V)
• Overvoltage (59)
• Third harmonic overvoltage (59-3H)
• Residual overvoltage (59N)
• Rotor earth fault (64F)
• Underfrequency & overfrequency (81U 81O)
• High impedance restricted earth fault (87NHIZ)
• Breaker failure (BF)
Monitoring and control functions
• CB diagnostic
• CTs monitoring (74CT)
• Digital Fault recording (DFR)
• Fault and event logging (SER & SFR)
• Logic selectivity
• Multiple setting profiles
• Self-test
• Trip circuit supervision (74TCS)
• VTs monitoring (74VT)
Hardware
• 16 binary inputs + 16 output relays + 24 LEDs
• 19-inch "4U" rack mounting
• 8 binary inputs + 8 output relays + 16 LEDs
• Auxiliary power supply 24-110 Vac/dc
• Auxiliary power supply 24-48 Vac/dc
• 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
• Standard CT amperometric inputs 1/5 A
Communication
• Modbus RTU RS232 protocol
• Modbus RTU RS485 / IEC 870-5-103 / DNP3 protocol
• Modbus TCP/IP protocol (network board must be provided)