IMinOpPhSel
AngleRCA
AngleROA
IEC15000266-2-en.vsdx
Greater
Comparator
Directional
Element
I3P
U3P
Directional
Release
Block
DFWDLx
DFWDLxx
DREVLx
DREVLxx
STLx
FORWARD_int
REVERSE_int
x‐meansthreephases1,2and3
xx–meansphasetophase12,23,31
IEC15000266 V2 EN-US
Figure 78: OC4 directional release block diagram
Different types of reset time can be selected as described in section "Inverse
characteristics".
There is a possibility to activate a preset change (IxMult x= 1, 2, 3 or 4) of the set
operation current via a binary input ENMULTx (enable multiplier). In some
applications the operation value needs to be changed, for example due to changed
network switching state.
The operation current value Ix>, is limited to be between Ix>Max and Ix>Min. The
default values of the limits are the same as the setting limits for Ix>, and the limits
can only be used for reducing the allowed range of Ix>. This feature is used when
remote setting of the operation current value is allowed, making it possible to
ensure that the operation value used is reasonable. If Ix> is set outside Ix>Max and
Ix>Min, the closest of the limits to Ix> is used by the function. If Ix>Max is
smaller then Ix>Min, the limits are swapped. The principle of the limitation is
shown in Figure
79.
hi
u
lo
y
MIN
MAX
Ix>_used
Ix>Max
Ix>
Ix>Min
IEC17000018-1-en.vsdx
IEC17000018 V1 EN-US
Figure 79: Logic for limitation of used operation current value
Section 8 1MRK 505 394-UEN A
Current protection
176 Line differential protection RED650 2.2 IEC
Technical manual
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