ABB REL650 series Technical Manual page 234

Section 7
Current protection
228
BLKTR
|I |
OP
Pickupx
BLKx
BLOCK
DirModeSelx=Disabled
DirModeSelx=Non-directional
DirModeSelx=Forward
DirModeSelx=Reverse
ANSI11000281 V1 EN
Figure 101: Operating characteristic for ground-fault directional element using the
zero sequence components
Characteristx=DefTime
a
a>b
b
AND
Characteristx=Inverse
STAGEx_DIR_Int
OR
AND
OR
FORWARD_Int
AND
REVERSE_Int
1MRK 506 335-UUS A
AND
0-tx
OR
0
0-txMin
AND
0
Inverse
ANSI11000281-1-en.vsd
ANSI11000281-1-en.vsd
Technical manual
AND
PU_STx