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 AEGPVOC . In addition, the BLKTR input that
blocks the TRIP signal is also present. The input BLKTR can be used if AEGPVOC
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 206: AEGPVOC logic diagram
8.13.1.7 Technical data
Table 240: AEGPVOC 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% at (20–900)% of IBase -
Transient overreach,
overcurrent function
<10% 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
Critical impulse time,
undervoltage
10 ms typically at 2 to 0 x U
set
-
Table continues on next page
1MRK502052-UEN B Section 8
Current protection
445
Technical manual
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