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Application
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.
Function
& Protection
21-51V - Underimpedance or Voltage-controlled
overcurrent protection
24 - Overexcitation (V/Hz)
26 - Thermal protection with 8 PT100 thermometric
probes
27 - Undervoltage
27H-59H - Third harmonic Under/Overvoltage (100%
stator earth fault)
32 - Active directional overpower
32R - Active reverse power
37P - Active underpower
40 - Loss of Field
46 - Negative sequence overcurrent
49 - Thermal image
50/51 - Phase overcurrent
50+27 - Inadvertent energizing
50G/51G-87N - Residual overcurrent (90% stator earth
fault) or, alternatively, high impedance restricted
earth fault.
59 - Overvoltage
59N - Residual overvoltage (90% stator earth fault)
64F - Rotor earth fault
81O - Overfrequency
81U - Underfrequency
BF - Breaker failure
74CT - Phase CT supervision
74VT - Line VT supervision
74TCS - Trip circuit supervision |
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