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
Increments 1 %
Restraint ratio further (n-th) harmonic
(either 3rd or 5th)
Ι
nfN
/
Ι
fN
10 % to 80 %
see also
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
Technical Data
4.2 Differential Protection
SIPROTEC 4, 7UT6x, Manual
409
C53000-G1176-C230-5, Edition 09.2016
Summary of Contents for SIPROTEC 4 7UT6 Series
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