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Functions
3154
3I0p Startpoint
3141
3I0p PICKUP
I
E
3I
0P
1309 >EF BLOCK 3I0p
3150
3I0p InrushBlk
Yes
inrush-
No
stabilization
3140
Op. mode 3I0p
Inactive
Forward
„1"
Reverse
Non-Directional
forwards
direction-
reverse
determination
Figure 6-71
Logic diagram of the 3I
Zero Sequence
Voltage Time Pro-
tection
(U
-Inverse)
0
6-124
The logic diagram is shown in Figure 6-71. In addition to the curve parameters, a min-
imum time 3I0p MinT-DELAY can be determined; below this time no tripping can oc-
cur. Below a current factor of 3I0p Startpoint , which is set as a multiple of the
basic setting 3I0p PICKUP , no tripping can take place.
Further information regarding the effect of the various parameters can be found in the
setting information of the function parameters in Sub-section 6.7.2, refer also to Figure
6-75.
The remaining setting options are the same as for the other curves.
&
&
permissive
teleprot..
&
≥1
&
&
switch on
to fault
–stage for the inverse logarithmic curve
0P
The zero sequence voltage time protection operates according to a voltage-depend-
ent trip time characteristic. It can be used instead of an inverse time overcurrent stage.
The voltage/time characteristic can be displaced in voltage direction for a determined
constant voltage ( U0inv. minimum , valid for t → ∞ ) and in time direction by a deter-
mined constant time ( T forw. (U0inv) ). The different characteristics and their un-
derlying formulae are shown in the Technical Data Section (10.5, Figure 10-5).
Figure 6-72 illustrates the functional principle. The tripping time depends on the level
of the zero sequence voltage U
voltage increases towards the earth fault location. The inverse characteristic results in
the shortest command time for the relay closest to the fault. The other relays then re-
set.
A further time stage T rev. (U0inv) provokes non-directional tripping with a volt-
age-independent delay. This stage can be set above the directional stage. When trip-
3153 LOG Curve
3145
3146
t
T
0
3147
Add.T-DELAY
3142
3I0p MinT-DELAY
T
0
3148
3I0p Telep/BI
≥1
Yes
No
FNo 1310
>EF Inst TRIP
SOTF Op. Mode
3172
3149
PICKUP+DIRECT.
PICKUP
&
. For meshed earthed systems the zero sequence
0
1357 EF 3I0p Pickup
3I0p Time Dial
3I0p MaxT-DELAY
&
3I
0
≥1
&
3I0p SOTF-Trip
Yes
T
0
No
3173
SOTF Time DELAY
C53000-G1176-C156-2
EF 3I0p TRIP
1369
7SA6 Manual
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