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.
7.2.3
Function block
M12609-3 v8
OC4PTOC
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
START
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 81:
OC4PTOC function block
1MRK 506 382-UEN A
Section 7
Current protection
Line distance protection REL650 2.2 IEC
163
Technical manual
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