Siemens SIPROTEC 4 7UT6 Series Manual page 409

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