hi
u
lo
y
MIN
MAX
Ix>_used
Ix>Max
Ix>
Ix>Min
IEC17000018-1-en.vsdx
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
Table 97:
Code description for STDIRCND output signal
STDIRCND
Description
bit 0 (1)
General start
bit 1 (2)
Direction detected in forward
bit 2 (4)
Direction detected in reverse
bit 3 (8)
Start in phase L1
bit 4 (16)
Forward direction detected in phase L1
bit 5 (32)
Reverse direction detected in phase L1
bit 6 (64)
Start in phase L2
bit 7 (128)
Forward direction detected in phase L2
bit 8 (256)
Reverse direction detected in phase L2
bit 9 (512)
Start in phase L3
bit 10 (1024)
Forward direction detected in phase L3
bit 11 (2048)
Reverse direction detected in phase L3
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.
GUID-E3980B2D-EEDA-4BF1-A07D-E7B721130554 v5
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
Section 8
1MRK 511 408-UUS A
Current protection
186
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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