•
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.
•
Supervision by second harmonic blocking feature (
On
/
Off
). By this parameter
setting it is possible to prevent operation of the step if the second harmonic
content in the residual current exceeds the preset level.
•
Multiplier for scaling of the set residual current pickup value by external binary
signal. By this parameter setting it is possible to increase residual current pickup
value when function binary input ENMULTx has logical value 1.
Simplified logic diagram for one residual overcurrent step is shown in figure
.
X
Inverse
OR
|I
OP
|
STINx
TRINx
AND
T
F
HarmRestrainx=Off
INx>
BLKSTx
BLOCK
OR
2ndHarm_BLOCK_Int
INxMult
Characteristx=Inverse
Characteristx=DefTime
DirModex=Off
DirModex=Non-directional
DirModex=Forward
DirModex=Reverse
AND
AND
FORWARD_Int
REVERSE_Int
OR
OR
STEPx_DIR_Int
IEC10000008.vsd
X
T
F
a
b
a>b
b
a
a>b
IMinx
AND
BLKTR
AND
AND
tx
min
tx
AND
t
t
EMULTX
IEC10000008 V5 EN
Figure 164:
Simplified logic diagram for residual overcurrent step x, where x = step 1, 2, 3 or 4
The protection can be completely blocked from the binary input BLOCK. Output
signals for respective step, and STINx and TRINx, can be blocked from the binary
input BLKSTx. The trip signals from the function can be blocked from the binary
input BLKTR.
8.4.7.8
Directional supervision element with integrated directional comparison
function
It shall be noted that at least one of the four residual overcurrent steps
shall be set as directional in order to enable execution of the
Section 8
1MRK502052-UEN B
Current protection
366
Technical manual
Summary of Contents for Relion REG670
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