ABB REC670 Applications Manual page 258

Section 10
Frequency protection
252
Setting procedure on the IED
The parameters for the frequency time accumulation protection FTAQFVR are set
using the local HMI or through the dedicated software tool in Protection and
Control Manager (PCM600).
Common base IED values for primary current IBase and primary voltage UBase
are set in the global base values for settings function GBASVAL. The
GlobalBaseSel is used to select GBASVAL for the reference of base values.
FTAQFVR used to protect a turbine:
Frequency during start-up and shutdown is normally not calculated, consequently
the protection function is blocked by CB position, parameter CBCheck enabled. If
the generator supply any load when CB is in open position e.g. excitation
equipment and auxiliary services this may be considered as normal condition and
CBCheck is ignored when the load current is higher then the set value of
CurrStartLevel. Set the current level just above minimum load.
EnaVoltCheck set to Disable.
tCont: to be coordinated to the grid requirements.
tAccLimit, FreqHighLimit and FreqLowLimit setting is derived from the turbine
manufacturer's operating requirements, note that FreqLowLimit setting must always
be lower than the set value of FreqHighLimit.
FTAQFVR used to protect a generator:
Frequency during start-up and shutdown is normally not calculated, consequently
the protection function is blocked by CB position, parameter CBCheck enabled.
CurrStartLevel set to Disable.
EnaVoltCheck set to Enable, voltage and frequency limits set according to the
generators manufacturer's operating requirements. Voltage and frequency settings
should also be coordinated with the starting values for over and underexcitation
protection.
tCont: to be coordinated to the grid requirements.
tAccLimit, FreqHighLimit and FreqLowLimit setting is derived from the generator
manufacturer's operating requirements.
1MRK 511 401-UEN A
Bay control REC670 2.2 IEC
Application manual