Idiff
differential current = |Ι
1
+ Ι
2
|
IRest
stabilising current = |Ι
1
| + |Ι
2
|
INObj Nominal current of protected object
Harmonic Restraint (Transformers)
Inrush restraint ratio
(2nd harmonic) Ι
2fN
/Ι
fN
10 % to 80 %
see also Figure 4-2
Increments 1 %
Restraint ratio further (n-th) harmonic
(either 3rd or 5th) Ι
nfN
/Ι
fN
10 % to 80 %
see also Figure 4-3
Increments 1 %
Crossblock function can be activated / deacti-
vated
Max. action time for crossblock to 1000 AC cycles
or 0 (crossblock deacti-
vated)
or ∞ (to)
Increments 1 cycle
Operating Times (Transformers)
7UT612
Pickup time / dropout time with single-side infeed
Pickup time at frequency 50 Hz 60 Hz
at 1.5 · setting Ι
Diff
>
at 1.5 · setting Ι
Diff
>>
at 5 · setting Ι
Diff
>>
38 ms
25 ms
19 ms
35 ms
22 ms
17 ms
Dropout time, approx. 35 ms 30 ms
Drop-off to pickup ratio approx. 0.7
7UT613/63x
Pickup time / dropout time with single-side infeed
Pickup time at frequency 50 Hz 60 Hz 16.7 Hz
Ι
Diff
> min
fast relays 30 ms 27 ms 78 ms
high-speed relays 25 ms 22 ms 73 ms
Ι
Diff
>> min
fast relays 11 ms 11 ms 20 ms
high-speed relays 6 ms 6 ms 15 ms
Dropout time, approx. 54 ms 46 ms 150 ms
Dropout ratio approx. 0.7
Conditioning for Transformers
Matching of vector group
0 to 11 (x 30°) Increments 1
Starpoint conditioning earthed or non-earthed
(for each winding)
Operating Range Frequency (Transformers)
Frequency influence within the frequency tagging range
see Figure 4-4
Technical Data
4.2 Differential Protection
SIPROTEC 4, 7UT6x, Manual 409
C53000-G1176-C230-5, Edition 09.2016
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