8.1.6
Monitored data
PID-6519-MONITOREDDATA v5
Table 210: PHPIOC (50) Monitored data
Name
Type
Values (Range)
Unit
Description
IA
REAL
-
A
Current in phase A
IB
REAL
-
A
Current in phase B
IC
REAL
-
A
Current in phase C
8.1.7
Operation principle
M12913-3 v7
The sampled analog phase currents are pre-processed in a discrete Fourier filter (DFT) block. The
RMS value of each phase current is derived from the fundamental frequency components, as well
as sampled values of each phase current. These phase current values are fed to the instantaneous
phase overcurrent protection 3-phase output function PHPIOC (50). In a comparator the RMS
values are compared to the set operation current value of the function
Pickup. If a phase current is
larger than the set operation current a signal from the comparator for this phase is set to true.
This signal will, without delay, activate the output signal TR_x(x=A, B or C) for this phase and the
TRIP signal that is common for all three phases.
There is an operation mode (
OpModeSel) setting: 1 out of 3 or 2 out of 3. If the parameter is set to
1 out of 3 any phase trip signal will be activated. If the parameter is set to 2 out of 3 at least two
phase signals must be activated for trip.
There is also a possibility to activate a preset change of the set operation current
(MultPU) via a
binary input (MULTPU). In some applications the operation value needs to be changed, for
example due to transformer inrush currents.
PHPIOC (50) can be blocked from the binary input BLOCK.
8.1.8
Technical data
IP11435-1 v1
M12336-1 v11
Table 211: PHPIOC (50) technical data
Function
Range or value
Accuracy
Trip current
(5-2500)% of lBase
±
1.0% of I
n
at I ≤ I
n
±
1.0% of I at I > I
n
Reset ratio
> 95% at (50–2500)% of IBase
-
Trip time at 0 to 2 x I
set
Min. = 15 ms
Max. = 25 ms
-
Reset time at 2 to 0 x I
set
Min. = 15 ms
Max. = 25 ms
-
Critical impulse time
10 ms typically at 0 to 2 x I
set
-
Trip time at 0 to 10 x I
set
Min. = 5ms
Max. = 15ms
-
Table continues on next page
1MRK 502 066-UUS B
Section 8
Current protection
449
Technical manual
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