When the maximum phase-to-phase voltage is larger than DisarmU> for the period
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 . In addition, the BLKTR input that
blocks the TRIP signal is also present. The input BLKTR can be used if AEGGAPC
is to be used only for monitoring purposes.
I>
Operation = ON
a
a>b
b
Imax_DFT
AND
BLOCK
TRIP
tOC
START
ARMED
S
R NOUT
OUT
ArmU<
a
a<b
b
Uph-ph_max_DFT
t
tArm
ON - Delay
DisarmU>
a
a>b
b
t
tDisarm
ON - Delay
OR
AND
IEC09000784-2-en.vsd
t
IEC09000784 V2 EN
Figure 120: AEGGAPC logic diagram
8.8.8 Technical data
Table 140: AEGGAPC technical data
Function
Range or value Accuracy
Operate value,
overcurrent
(5-900)% of IBase ± 1,0% of I
r
at I<I
r
± 1.0% of I at I>I
r
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
-
Impulse margin time,
overcurrent
15 ms typically -
Operate value,
undervoltage
(2-150)% of UBase ± 0.5% of U
r
at U<U
r
± 0.5% of U at U>U
r
Table continues on next page
Section 8 1MRK 502 048-UEN A
Current protection
242
Technical manual
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