Differential Protection
Pickup Values
Differential current
Ι
Diff
>/Ι
NObj
0.05 to 2.00 Increments 0.01
High-current stage
Ι
Diff
>>/Ι
NObj
0.5 to 35.0
or ∞ (ineffective)
Increments 0.1
Increase of the pickup value when
connecting as a factor of Ι
Diff
>
1.0 to 2.0 Increments 0.1
Add-on restraint on external fault
(Ι
Rest
> setting value)
Action time
Ι
add-on
/Ι
NObj
2.00 to 15.00
2 to 250 cycles
or ∞ (active until
dropout)
Increments 0.01
Increments 1 cycle
Trip characteristic see Figure 4-1
Tolerances (with preset characteristic parameters, for 2 sides with 1 measuring location
each)
Ι
Diff
>-stage and characteristic
5 % of set value
Ι
Diff
>>-stage
5 % of set value
Time Delays
Delay of
Ι
Diff
>-stage
T
ΙDiff>
0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Delay ofΙ
Diff
>>-stage
T
ΙDiff>>
0.00 s to 60.00 s
or ∞ (no trip)
Increments 0.01 s
Time tolerance 1 % of set value or 10 ms
The set times are pure delay times
[tdausloesekennliniediff7ut612-021026-rei, 1, en_GB]
Figure 4-1 Tripping characteristic of the differential protection
4.2
Technical Data
4.2 Differential Protection
408 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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