The input signal DIRCND is used to give condition for directionality for the distance measuring
zones. The signal contains binary coded information for both forward and reverse direction. The
zone measurement function filters out the relevant signals depending on the setting of the
parameter
DirMode
. Input signal DIRCND must be configured to the STDIRCND output signal on
ZDMRDIR (21D) function.
OffsetMhoDir=
Non-directional
DirMode=Offset
OR
LDCND
LoadEnchMode=
On/Off
AND
PHSEL
ANSI11000216-1-en.vsd
DIRCND
OffsetMhoDir=
Forward/Reverse
DirMode=
Forward/Reverse
T
F
BLKZ
BLOCK
Release
AND
AND
AND
AND
AND
T
F
True
ANSI11000216 V1 EN-US
Figure 107: Simplified logic for release start signal
When load encroachment mode is switched on (
LoadEnchMode=On
), start signal PHSEL is also
checked against LDCND signal.
Results of the directional measurement enter the logic circuits when the zone operates in
directional (forward or reverse) mode, as shown in figure
107.
Composition of the phase pickup signals is presented in figure
108.
Section 7 1MRK 502 066-UUS B
Impedance protection
232
Technical manual
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