ABB ret650 - Page 174

a
b
a>b
OR
|I
OP
|
STx
T
R
x
AND
AND
Ix>
BLKSTx
BLOCK
Characteristx=DefTime
DirModex=Off
DirModex=Non-directional
DirModex=Forward
DirModex=Reverse
AND
AND
FORWARD_Int
REVERSE_Int
OR
BLKTR
OR
STAGEx_DIR_Int
SimplifiedlogicdiagramforresidualOC
stagex-IEC11000281.vsd
AND
AND
Characteristx=Inverse
Inverse
tx
min
tx
IEC11000281-1-en.vsd
IEC11000281 V1 EN
Figure 72: Operating characteristic for earth-fault directional element using the
zero sequence components
Section 8 1MRK 504 135-UEN A
Current protection
168
Technical manual