Results of the directional measurement enter the logic circuits, when the zone operates
in directional (forward or reverse) mode, see figure 138.
NDIR_A
DIR_A
NDIR_B
DIR_B
NDIR_C
DIR_C
&
&
&
&
&
BLK
PU_2MPG
PU_A
PU_B
PU_C
PICKUP
AND
AND
AND
OR
OR
en07000081_ansi.vsd
15 ms
0
15 ms
0
15 ms
0
15 ms
0
ANSI07000081 V1 EN
Figure 138: Composition of pickup signals in directional operating mode
Tripping conditions for the distance protection zone one are symbolically presented in
figure 139.
en07000082_ansi.vsd
Timer tPG=Enable
PUZMPG
AND
BLKTR
AND
AND
AND
PU_A
PU_B
PU_C
TRIP
TR_A
TR_B
TR_C
AND
0-tPG
0
0
15 ms
ANSI07000082 V1 EN
Figure 139: Tripping logic for the distance protection zone one
Section 6 1MRK505222-UUS C
Impedance protection
272
Technical reference manual
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