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available. For the complete list of available inverse curves please refer to section
"Inverse time characteristics"
.
•
Time delay related settings. By these parameter settings the properties like definite
time delay, minimum operating time for inverse curves and reset time delay are
defined.
•
Supervision by second harmonic blocking feature (
Enabled
/
Disabled
). 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.
Simplified logic diagram for one residual overcurrent step is shown in figure
.
a
b
a>b
Inverse
OR
|I
OP
|
PU_ST
x
TRST
x
AND
HarmRestrainx=Disabled
Pickupx
BLKx
BLOCK
OR
2ndH_BLOCK_Int
Characteristn=Inverse
Characteristn=DefTime
DirModeSelx=Disabled
DirModeSelx=Non-directional
DirModeSelx=Forward
DirModeSelx=Reverse
AND
AND
FORWARD_Int
REVERSE_Int
OR
OR
STEPx_DIR_Int
ANSI09000638-3-en.vsd
0
0-tx
AND
0
0-txMin
AND
ANSI09000638 V3 EN
Figure 37:
Simplified logic diagram for residual overcurrent
The protection can be completely blocked from the binary input BLOCK. Output signals
for respective step, PU_STx and TRSTx and , can be blocked from the binary input
BLKn.
6.4.7.7
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 directional
supervision element and the integrated directional comparison function.
The protection has integrated directional feature. The operating quantity current
I3PDIR
is always used. The polarizinwcg method is determined by the parameter setting
1MRK 511 287-UUS A
Section 6
Current protection
109
Technical manual
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