ABB Relion REG670, Technical Manual

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output function PHPIOC. In a comparator the RMS values are compared to the set
operation current value of the function
(IP>>) . 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 TRLn (n=1,2,3) for this phase and the
TRIP signal that is common for all three phases.
There is an operation mode ( OpMode ) 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
(StValMult) via a binary input (ENMULT). In some applications the operation value
needs to be changed, for example due to transformer inrush currents.
PHPIOC can be blocked from the binary input BLOCK.
8.1.8 Technical data
Table 157: PHPIOC technical data
Function Range or value Accuracy
Operate current (5-2500)% of lBase ± 1.0% of I
r
at I ≤ I
r
±
1.0% of I at I > I
r
Reset ratio > 95% at (50–2500)% of
IBase
-
Operate time at 0 to 2 x I
set
Min. = 15 ms
Max. = 25 ms
-
Reset time at 2 to 0 x I
set
Min. = 15ms
Max. = 25ms
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Operate time at 0 to 10 x I
set
Min. = 5ms
Max. = 15 ms
-
Reset time at 10 to 0 x I
set
Min. = 25ms
Max. = 40 ms
-
Critical impulse time 2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
8.2 Four step phase overcurrent protection 3-phase
output OC4PTOC
1MRK502052-UEN B
Section 8
Current protection
335
Technical manual