ABB Relion REC670 Applications Manual page 203

1MRK 511 358-UEN A
Common base IED values for primary current
global base values for settings function GBASVAL. The
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
supply any load when CB is in open position e.g. excitation equipment and auxiliary services
this may be considered as normal condition and
higher then the set value of
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
value of
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
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.
Application manual
CurrStartLevel . Set the current level just above minimum load.
FreqHighLimit .
IBase and primary voltage UBase are set in the
GlobalBaseSel is used to select
CBCheck enabled. If the generator
CBCheck is ignored when the load current is
FreqLowLimit setting must always be lower than the set
CBCheck enabled.
Section 9
Frequency protection
197