ABB Relion 670 series - Page 393

a
b
a>b
OR
|I
OP
|
STx
T R
x
AND
Pickupx
BLKSTx
BLOCK
Characteristx=DefTime
DirModeSelx=Disabled
DirModeSelx=Non-directional
DirModeSelx=Forward
DirModeSelx=Reverse
AND
AND
FORWARD_Int
REVERSE_Int
OR
OR
STAGEx_DIR_Int
ANSI12000008-1-en.vsd
AND
AND
Characteristx=Inverse
Inverse
ANSI12000008-1-en.vsd
0
0-tx
0
0-txMin
ANSI12000008 V1 EN
Figure 203: Simplified logic diagram for OC4PTOC
Different types of reset time can be selected as described in section "Inverse
characteristics".
There is also a possibility to activate a preset change (MultiPUx, x= 1, 2, 3 or 4) of the
set operation current via a binary input (enable multiplier). In some applications the
operation value needs to be changed, for example due to changed network switching
state. The function can be blocked from the binary input BLOCK. The pickup signals
from the function can be blocked from the binary input BLK. The trip signals from the
function can be blocked from the binary input BLKTR.
1MRK505222-UUS C Section 7
Current protection
387
Technical reference manual