Name Values (Range) Unit Step Default Description
CBCheck Disable
Enable
- - Enable Enabling the generator start or stop
detection logic
PickupCurrentLevel 5.0 - 100.0 %IB 0.1 10.0 Threshold current value of generator in
percentage of base current
EnaVoltCheck Disable
Enable
- - Enable Enabling the voltage band limit check
VHighLimit 0.0 - 200.0 %VB 1.0 200.0 Voltage high limit for voltage band limit
check
VLowLimit 0.0 - 200.0 %VB 1.0 0.0 Voltage low limit for voltage band limit
check
Table 400: FTAQFVR (81A) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
initTimeAcc 0.000 -
90000.000
s 0.001 0.0 Initial accumulated time when LOADINIT
command is executed
10.4.6 Monitored data
PID-3229-MONITOREDDATA v4
Table 401: FTAQFVR (81A) Monitored data
Name Type Values (Range) Unit Description
FREQ REAL - Hz Measured frequency value
ACCTIME REAL - s Accumulated time for frequency band
limits
LASTEVTD REAL - - Accumulation time for last event of
frequency within band
10.4.7 Operation principle
GUID-DB8A3411-2FA6-47B1-BC75-9892BD224DC0 v4
Frequency time accumulation protection function FTAQFVR (81A) is used to protect the turbine
against an abnormal frequency operation. During the startup and shutdown of the turbine-
generator set, FTAQFVR (81A) is blocked to avoid unnecessary accumulation of time or tripping of
generator. FTAQFVR (81A) is also blocked when the system positive-sequence voltage magnitude
deviates from the given voltage band limit, which can be enabled with the
EnaVoltCheck
setting.
The overall logic of FTAQFVR (81A) is explained in Figure
369.
The frequency of the measured input voltage is monitored continuously and compared to the set
frequency band limits
FreqHighLimit
and
FreqLowLimit
. When the measured system frequency is
above the
FreqLowLimit
setting and below the
FreqHighLimit
setting, the FREQOK and PICKUP
signals are activated. The BFI_3P signal is controlled by the measured current and voltage input
magnitude and the status of the circuit breaker position.
Section 10 1MRK 502 066-UUS B
Frequency protection
682
Technical manual
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