reverse direction. The zone measurement function filter out the relevant signals on the
DIRCND input depending on the setting of the parameter OperationDir. It shall be
configured to the DIRCND output on the Directional impedance element for mho
characteristic (ZDMRDIR,21D) function.
en06000408_ansi.vsd
AND
AND
AND
AG
BG
CG
PHSEL
NDIR_A
NDIR_B
NDIR_C
NDIR_G
AND
BLOCK
LOVBZ
PHPUND
BLK
OR
OR
OR
ANSI06000408 V1 EN
Figure 136: Conditioning by a group functional input signal PHSEL
Composition of the phase pickup signals for a case, when the zone operates in a non-
directional mode, is presented in figure 137.
en06000409_ansi.vsd
NDIR_A
NDIR_B
NDIR_C
OR
AND
AND
AND
AND
BLK
PICKUP
PU_C
PU_B
PU_A
15 ms
0
15 ms
0
15 ms
0
15 ms
0
ANSI06000409 V1 EN
Figure 137: Composition of pickup signals in non-directional operating mode
1MRK505222-UUS C Section 6
Impedance protection
271
Technical reference manual
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