ABB RELION 670 Series Technical Manual page 455

1MRK 502 066-UUS B
8.1.6 Monitored data
Table 210: PHPIOC (50) Monitored data
Name
IA
IB
IC
8.1.7 Operation principle
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
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 (
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
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
Table 211: PHPIOC (50) technical data
Function
Trip current
Reset ratio
Trip time at 0 to 2 x I
Reset time at 2 to 0 x I
Critical impulse time
Trip time at 0 to 10 x I
Table continues on next page
Technical manual
Type Values (Range)
REAL -
REAL -
REAL -
OpModeSel ) setting: 1 out of 3 or 2 out of 3 . If the parameter is set to
Range or value
(5-2500)% of lBase
> 95% at (50–2500)% of IBase
Min. = 15 ms
set
Max. = 25 ms
Min. = 15 ms
set
Max. = 25 ms
10 ms typically at 0 to 2 x I
Min. = 5ms
set
Max. = 15ms
Unit Description
A Current in phase A
A Current in phase B
A Current in phase C
Pickup . If a phase current is
Accuracy
±1.0% of I
±1.0% of I at I > I
-
-
-
-
set
-
Section 8
Current protection
PID-6519-MONITOREDDATA v5
M12913-3 v7
(MultPU) via a
IP11435-1 v1
M12336-1 v11
at I ≤ I
n n
n
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