The activation of the BLOCK input resets Timer and blocks the START and OPERATE
outputs.
Timer calculates the start duration value START_DUR which indicates the percentage
ratio of the start situation and the set operating time. The value is available in the
monitored data view.
4.1.4.6 Application
Accidental energization protection or dead machine protection is necessary as part
of the generator protection application. In case of operating error, breaker head
flashovers, control circuit malfunctions or a combination of these, the generator
may be accidentally energized while offline. High currents might cause mechanical
and thermal stress to the generator and cables, and other related power station
equipment.
4.1.4.7 Signals
GAEPVOC Input signals
Table 426: GAEPVOC Input signals
Name Type Default Description
I3P SIGNAL - Three-phase currents
U3P SIGNAL - Three-phase voltages
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
GAEPVOC Output signals
Table 427: GAEPVOC Output signals
Name Type Description
OPERATE BOOLEAN Operate
START BOOLEAN Start
ARMED BOOLEAN Current limit active (Armed)
4.1.4.8 GAEPVOC Settings
Table 428: GAEPVOC Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Start value 0.05...9.00 xIn 0.01 1.20 Start value
Arm set voltage 0.05...1.00 xUn 0.01 0.30 Voltage level to
arm the protection
(Phase-to-phase
value of voltage)
Disarm set voltage 0.50...1.50 xUn 0.01 0.80 Voltage level to
disarm the pro-
Table continues on the next page
1MRS759142 F Protection functions
REX640
Technical Manual
381
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