ABB REC670 Applications Manual page 273

1MRK 511 401-UUS A
Bay control REC670 2.2 ANSI
Application manual
Setting procedure on the IED
The parameters for the frequency time accumulation protection FTAQFVR (81A) 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 VBase 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 (81A) 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 PickupCurrentLevel. 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 (81A) 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.
PickupCurrentLevel 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 pickup 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.
Section 10
Frequency protection
267