ABB RES670 Technical Manual page 210

Section 8
Current protection
BLKTR
EMULTX
IMinx
X
MultPUx
X
Pickupx
BLKx
BLOCK
2ndHarm_BLOCK_Int
HarmRestrainx=Disabled
DirModex=Off
DirModex=Non-directional
DirModex=Forward
DirModex=Reverse
ANSI10000008 V3 EN-US
Figure 59: Simplified logic diagram for residual overcurrent step x, where x = step 1, 2, 3 or 4
204
set outside INx>Max and INx>Min, the closest of the limits to INx> is used by the
function. If INx>Max is smaller then INx>Min, the limits are swapped. The
principle of the limitation is shown in Figure 58.
INx>Max
INx>
INx>Min
IEC17000017 V1 EN-US
Figure 58: Logic for limitation of used operation current value
Simplified logic diagram for one residual overcurrent step is shown in Figure 59.
Characteristx=DefTime
T
b
a>b
F
a
|I |
OP
a
a>b
b
T
F
Characteristx=Inverse
OR
STEPx_DIR_Int
OR
AND
FORWARD_Int
AND
REVERSE_Int
The protection can be completely blocked from the binary input BLOCK. Output
signals for respective step, and PUSTx and TRSTx, can be blocked from the binary
MAX
MIN
tx
AND
Inverse
AND
OR
1MRK 511 408-UUS A
hi
u
lo
AND
OR
tMin
Phasor measurement unit RES670 2.2 ANSI
INx>_used
y
IEC17000017-1-en.vsdx
TRSTx
PUSTx
ANSI10000008-4-en.vsd
Technical manual