•
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 ENMULTx has
logical value 1.
Simplified logic diagram for one negative sequence overcurrent stage is shown in the
following figure:
X
a
b
a>b
ENMULTx
OR
|I
OP
|
STx
TRx
AND
AND
T
F
Ix>
BLKSTx
BLOCK
IxMult
Characteristx=DefTime
DirModex=Off
DirModex=Non-directional
DirModex=Forward
DirModex=Reverse
AND
AND
FORWARD_Int
REVERSE_Int
OR
BLKTR
OR
STAGEx_DIR_Int
IEC09000683.vsd
AND
AND
Characteristx=Inverse
Inverse
tx
min
tx
IEC09000683 V3 EN
Figure 171:
Simplified logic diagram for negative sequence overcurrent stage x , where x=1, 2, 3 or 4
NS4PTOC can be completely blocked from the binary input BLOCK. The start
signals from NS4PTOC for each stage can be blocked from the binary input
BLKSTx. The trip signals from NS4PTOC can be blocked from the binary input
BLKTR.
8.5.7.6
Directional supervision element with integrated directional comparison
function
At least one of the four negative sequence overcurrent steps must be
set as directional in order to enable execution of the directional
Section 8
1MRK502052-UEN B
Current protection
384
Technical manual
Содержание Relion REG670
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