Function Block - ABB RED650 Technical Manual

1MRK 505 394-UEN A
8.2.3
Line differential protection RED650 2.2 IEC
Technical manual
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.

Function block

OC4PTOC
I3P* TRIP
U3P* TR1
BLOCK TR2
BLKTR TR3
BLKST1 TR4
BLKST2 TRL1
BLKST3 TRL2
BLKST4 TRL3
ENMULT1 TR1L1
ENMULT2 TR1L2
ENMULT3 TR1L3
ENMULT4 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 74: OC4PTOC function block
Section 8
Current protection
M12609-3 v8
163