ABB RES670 Technical Manual page 192

Section 8
Current protection
186
Ix>Max
Ix>
Ix>Min
IEC17000018 V1 EN-US
Figure 55: Logic for limitation of used operation current value
The STDIRCND output provides an integer signal that depends on the start and
directional evaluation and is derived from a binary coded signal as described in Table
97.
Table 97: Code description for STDIRCND output signal
STDIRCND
bit 0 (1)
bit 1 (2)
bit 2 (4)
bit 3 (8)
bit 4 (16)
bit 5 (32)
bit 6 (64)
bit 7 (128)
bit 8 (256)
bit 9 (512)
bit 10 (1024)
bit 11 (2048)
All four steps in OC4PTOC (51/67) can be blocked from the binary input BLOCK.
The binary input BLKx (x=1, 2, 3 or 4) blocks the operation of the respective step.
The pickup signals from the function can be blocked by the binary input BLK.The trip
signals from the function can be blocked by the binary input BLKTR.
A harmonic restrain of the directional phase overcurrent protection function OC4PTOC
51_67 can be chosen. If the ratio of the 2nd harmonic component in relation to the
fundamental frequency component in a phase current exceeds the preset level defined
by the parameter 2ndHarmStab setting, any of the four overcurrent stages can be
selectively blocked by the parameter HarmBlockx setting. When the 2nd harmonic
MAX
hi
u
MIN
lo
Description
General start
Direction detected in forward
Direction detected in reverse
Start in phase L1
Forward direction detected in phase L1
Reverse direction detected in phase L1
Start in phase L2
Forward direction detected in phase L2
Reverse direction detected in phase L2
Start in phase L3
Forward direction detected in phase L3
Reverse direction detected in phase L3
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
Ix>_used
y
IEC17000018-1-en.vsdx
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