IfN
Current at nominal frequency
Inf
Current at n times the frequency (n = 3 oder 4)
[tdfrequenzeinf-trafo-7ut613, 1, en_GB]
Figure 4-4
Frequency influence in transformer differential protection
Idiff
Differential current = |
Ι
1
+
Ι
2
|
INObj
Nominal current of protected object
IXf
Current at any frequency within specified range
Operating Times (Generators, Motors, Reactors)
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
Technical Data
4.2 Differential Protection
SIPROTEC 4, 7UT6x, Manual
411
C53000-G1176-C230-5, Edition 09.2016
Summary of Contents for SIPROTEC 4 7UT6 Series
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