ABB Relion 670 Series Technical Reference Manual page 194

Section 6
Impedance protection
188
NDIR_A
AND
DIR_A
NDIR_B
DIR_B AND
NDIR_C
DIR_C
AND
NDIR_AB
DIR_AB AND
NDIR_BC
DIR_BC AND
NDIR_CA
AND
DIR_CA
BLK
ANSI09000888 V2 EN
Figure 82: Composition of pickup signals in directional operating mode
Tripping conditions for the distance protection zone one are symbolically presented in
figure 83.
OR
OR
0
AND
15 ms
OR
0
AND
15 ms
OR
0
AND
15 ms
OR
OR
0
AND
15 ms
Technical reference manual
1MRK505222-UUS C
PU_ZMPG
PU_A
PU_B
PU_C
PU_ZMPP
PICKUP
ANSI09000888-2-en.vsd