Greater
Comparator
Directional
Element
I3P
V3P
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
AngleRCA
AngleROA
PUminOpPhSel
ANSI15000266-2-en.vsdx
ANSI15000266 V2 EN-US
Figure 54:
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 (
MultiPUx,
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
1MRK 511 408-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.2 ANSI
185
Technical manual
Summary of Contents for Relion RES670
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