8.8.5
Settings
Table 137:
AEGGAPC (50AE) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Disable/Enable Operation
I>
5 - 900
%IB
1
120
Phase current pickup in % of IBase
tOC
0.000 - 60.000
s
0.001
0.030
Trip time daly for overcurrent level
ArmU<
2 - 150
%VB
1
50
Undervoltage level to arm protection in % of
Vbase
tArm
0.000 - 60.000
s
0.001
5.000
Time delay to arm protection with undervoltage
pickup
DisarmU>
2 - 200
%VB
1
80
Over voltage level to disarm protection in % of
Vbase
tDisarm
0.000 - 60.000
s
0.001
0.500
Time delay to disarm protection when voltage
greater than drop out level
Table 138:
AEGGAPC (50AE) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 6
-
1
1
Selection of one of the Global Base Value
Groups
8.8.6
Monitored data
Table 139:
AEGGAPC (50AE) Monitored data
Name
Type
Values (Range)
Unit
Description
IMAX
REAL
-
A
Maximum value of current
UMAX
REAL
-
kV
Maximum value of phase to
phase voltage
8.8.7
Operation principle
Accidental energizing protection for synchronous generator AEGGAPC (50AE) function
is connected to three phase current input either from the generator terminal side or from
generator neutral point side and three phase voltage from the generator terminals. The
maximum of the three phase-to-phase voltages and maximum of the three phase currents
are measured.
When the maximum phase-to-phase voltage is less than the
27_pick_up
for the period
tArm
, it is ensured that the generator is off-line. The Enabled signal will initiate the arming
and enable the overcurrent function. If the calculated maximum current of the three phases
1MRK 502 048-UUS A
Section 8
Current protection
263
Technical manual
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