ABB RELION REX640 Technical Manual page 381

1MRS759142 F
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
I3P
U3P
BLOCK
GAEPVOC Output signals
Table 427: GAEPVOC Output signals
Name
OPERATE
START
ARMED
4.1.4.8 GAEPVOC Settings
Table 428: GAEPVOC Group settings (Basic)
Parameter Values (Range)
Start value 0.05...9.00
Arm set voltage 0.05...1.00
Disarm set voltage 0.50...1.50
Table continues on the next page
REX640
Technical Manual
Type
SIGNAL
SIGNAL
BOOLEAN
Type
BOOLEAN
BOOLEAN
BOOLEAN
Unit Step
xIn 0.01
xUn 0.01
xUn 0.01
Protection functions
Default Description
- Three-phase currents
- Three-phase voltages
0=False Block signal for acti-
vating the blocking
mode
Description
Operate
Start
Current limit active (Armed)
Default
1.20
0.30
0.80
Description
Start value
Voltage level to
arm the protection
(Phase-to-phase
value of voltage)
Voltage level to
disarm the pro-
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