The directional function needs voltage as it is voltage polarized with memory. The
function can be set to be directional or non-directional independently for each of
the steps.
A second harmonic blocking level can be set for the function and can be used to
block each step individually.
8.2.3 Function block
M12609-3 v8
OC 4PTOC
I3P*
U3P*
BLOCK
BLKTR
BLKST1
BLKST2
BLKST3
BLKST4
ENMULT1
ENMULT2
ENMULT3
ENMULT4
TRIP
TR1
TR2
TR3
TR4
TRL1
TRL2
TRL3
TR1L1
TR1L2
TR1L3
TR2L1
TR2L2
TR2L3
TR3L1
TR3L2
TR3L3
TR4L1
TR4L2
TR4L3
S TAR T
ST1
ST2
ST3
ST4
STL1
STL2
STL3
ST1L1
ST1L2
ST1L3
ST2L1
ST2L2
ST2L3
ST3L1
ST3L2
ST3L3
ST4L1
ST4L2
ST4L3
ST2NDHRM
DIRL1
DIRL2
DIRL3
STDI RCND
IEC06000187-4-en.vsdx
IEC06000187 V4 EN-US
Figure 74: OC4PTOC function block
1MRK 505 394-UEN A Section 8
Current protection
Line differential protection RED650 2.2 IEC 163
Technical manual
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