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is larger than
IPickup
for the period
tOC
then the TRIP signal becomes activated. Also
PICKUP signal becomes activated when overcurrent is detected.
When the maximum phase-to-phase voltage is larger than
59_Drop_out
for a period
longer than
tDisarm
, it is ensured generator is on line. During this state, undervoltage
operation is disarmed, blocking the overcurrent operation and thus the function becomes
inoperative.
BLOCK input can be used to block AEGGAPC (50AE). In addition, the BLKTR input
that blocks the TRIP signal is also present. The input BLKTR can be used if AEGGAPC
(50AE) is to be used only for monitoring purposes.
IPickup
Operation = Enabled
a
a>b
b
Imax_DFT
AND
BLOCK
TRIP
RI
Enabled
S
R
NOUT
OUT
27_pick_up
a
a<b
b
Uph-ph_max_DFT
ON - Delay
59_Drop_out
a
a>b
b
ON - Delay
OR
AND
ANSI09000784-2-en.vsd
0
0-tOC
0
0-tArm
0
0-tDisarm
ANSI09000784 V2 EN
Figure 120:
AEGGAPC (50AE) logic diagram
8.8.8
Technical data
Table 140:
AEGGAPC (50AE) technical data
Function
Range or value
Accuracy
Operate value,
overcurrent
(5-900)% of IBase
± 1,0% of I
n
at I<I
n
± 1.0% of I at I>I
n
Reset ratio, overcurrent
>95%
-
Transient overreach,
overcurrent function
<20% at τ = 100 ms
-
Critical impulse time,
overcurrent
10 ms typically at 0 to 2 x I
set
-
Table continues on next page
Section 8
1MRK 502 048-UUS A
Current protection
264
Technical manual
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