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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
‐
means
three
phases
1,2
and
3
xx
–
means
phase
to
phase
12,23,31
IEC15000266 V2 EN-US
Figure 85:
OC4 directional release block diagram
Different types of reset time can be selected as described in section
.
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
hi
u
lo
y
MIN
MAX
Ix>_used
Ix>Max
Ix>
Ix>Min
IEC17000018-1-en.vsdx
IEC17000018 V1 EN-US
Figure 86:
Logic for limitation of used operation current value
Section 7
1MRK 506 382-UEN A
Current protection
176
Line distance protection REL650 2.2 IEC
Technical manual
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