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Application
The NTGB 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.
Protective
functions
21-51V - Underimpedance or Voltage-controlled
overcurrent protection
24 - Overexcitation (V/Hz)
27 - Undervoltage
32R - Active reverse power
40 - Loss of Field
46 - Negative sequence overcurrent
49 - Thermal image
50/51 - Phase overcurrent
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)
81O - Overfrequency
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