ABB ret650, Technical Manual

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8.1.5 Settings
Table 68: PHPIOC Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Off
On
- - Off Operation Off / On
IP>> 5 - 2500 %IB 1 200 Operate phase current level in % of IBase
Table 69: PHPIOC Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Value
groups
8.1.6 Monitored data
Table 70: PHPIOC Monitored data
Name Type Values (Range) Unit Description
IL1 REAL - A Current in phase L1
IL2 REAL - A Current in phase L2
IL3 REAL - A Current in phase L3
8.1.7 Operation principle
The sampled analogue 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. 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 TRIP signal that is common for all three phases.
PHPIOC can be blocked from the binary input BLOCK.
8.1.8 Technical data
Table 71: 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% -
Operate time 20 ms typically at 0 to 2 x I
set
-
Table continues on next page
Section 8
1MRK 504 135-UEN A
Current protection
142
Technical manual