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Functions
Definite Time Very
High Set Current
Stage 3I
>>>
0
3I0>>>
3111
I
E
3I
>>>
0
1305 >EF BLK 3I0>>>
3I0>>>InrushBlk
3115
Yes
inrush-
No
stabilization
Op. mode 3I0>>>
3110
Inactive
Forward
Reverse
„1"
Non-Direct.
forwards
direction-
reverse
determination
Figure 6-69
Logic diagram of the 3I
Definite Time High
Set Current
Stage 3I
>>
0
Definite Time
Overcurrent
Stage 3I
>
0
6-122
The earth current I
= 3 I
E
the set value 3I0>>> . If this value is exceeded and alarm is issued. After the corre-
sponding delay times T 3I0>>> have expired, a trip command is issued which is also
alarmed. The reset threshold is approximately 5 % + 0,5 mA below the pick-up thresh-
old.
The possibilities of selection are referred to in the heading "General". Figure 6-69
shows the logic diagram of the 3I
mination", "permissive teleprotection", "switch onto fault", and "inrush stabilization" are
common to all stages and described below. They may however affect each stage in-
dividually. This is done with the following parameters:
• Op. mode 3I0>>> , determines the operating direction of the stage: Forward ,
Reverse or Non-Directional ,
• 3I0>>> Telep/BI , determines whether a non-delayed trip with the teleprotection
scheme is possible ( Yes ) or not possible ( No ),
• 3I0>>>SOTF-Trip , determines whether during energization of the feeder onto a
fault tripping with this stage shall be non-delayed ( Yes ) or not ( No ) and
• 3I0>>>InrushBlk , which is used to switch the inrush stabilization (rush blocking)
on ( Yes ) or off ( No ).
&
&
3113
permissive
teleprot..
&
&
≥1
&
switch onto
fault
>>>–stage
0
The logic of the high set current stage 3I
3I0>>> is therefore to be replaced by 3I0>> , then, Figure 6-69 also applies for 3I
The logic of the overcurrent stage 3I
3I0>>> is therefore replaced with 3I0> , then, Figure 6-69 also applies for 3I
This stage operates with a specially optimized digital filter that completely suppresses
all harmonic components beginning with the 2nd harmonic. Therefore it is particularly
is passed through a numerical filter and then compared with
0
>>>–stage. The function modules "direction deter-
0
3112
T
3I0>>> Telep/BI
Yes
≥1
No
FNo1310
>EF Inst TRIP
3172
SOTF Op. Mode
3114
PICKUP+DIRECT.
PICKUP
&
3173 TSOTF Time DELAY
>> is the same as that of the 3I
0
> is the same as that of the 3I
0
1354 EF 3I0>>>Pickup
T 3I0>>>
0
≥1
1366
&
3I0>>>SOTF-Trip
Yes
T
0
No
>>>–stage.
0
C53000-G1176-C156-2
EF 3I0>>> TRIP
>>>–stage.
0
>>.
0
>.
0
7SA6 Manual
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