ABB RES670 Technical Manual page 230

Section 8
Current protection
ANSI09000684 V1 EN-US
Figure 66: Simplified logic diagram for negative sequence overcurrent stage x , where x=1, 2, 3 or 4
224
are available. For the complete list of available inverse curves, refer to Chapter
"Inverse characteristics"
• Type of reset characteristic (Instantaneous / IEC Reset /ANSI reset).By this
parameter setting it is possible to select the reset characteristic of the stage. For the
complete list of available reset curves, refer to Chapter
• Time delay related settings. By these parameter settings the properties like definite
time delay, minimum operating time for inverse curves, reset time delay and
parameters to define user programmable inverse curve are defined.
• Multiplier for scaling of the set negative sequence current pickup value by external
binary signal. By this parameter setting it is possible to increase negative sequence
current pickup value when function binary input MULTPUx has logical value 1.
Simplified logic diagram for one negative sequence overcurrent stage is shown in the
following figure:
NS4PTOC (4612) can be completely blocked from the binary input BLOCK. The
pickup signals from NS4PTOC (4612) for each stage can be blocked from the binary
input BLKx. The trip signals from NS4PTOC (4612) can be blocked from the binary
input BLKTR.
1MRK 511 408-UUS A
"Inverse characteristics"
Phasor measurement unit RES670 2.2 ANSI
Technical manual