ABB Relion REC670 - Page 203

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 511 358-UEN A Section 9
Frequency protection
197
Application manual