The PHSEL input signal represents a connection of six different integer values from
Phase selection with load encroachment, quadrilateral characteristic function
FMPSPDIS (21) within the IED, which are converted within the zone measuring
function into corresponding boolean expressions for each condition separately. Input
signal PHSEL is connected to FMPSPDIS (21) function output signal PHSCND.
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
Figure 126: Simplified logic for release start signal
When load encroachment mode is switched on (LoadEnchMode=On) then 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 126.
Composition of the phase pickup signals is presented in figure 81.
1MRK505222-UUS C Section 6
Impedance protection
255
Technical reference manual
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