Operating Range Frequency (Generators, Motors, Reactors)
Frequency influence within the frequency tagging range see Figure 4-5
[tdfrequenzeinf-genmot-7ut612-021026-rei, 1, en_GB]
Figure 4-5 Frequency influence (generator / motor protection and busbar protection)
Idiff
Differential current = |Ι
1
+ Ι
2
|
INObj Nominal current of protected object
IXf Current at any frequency within specified range
Differential Current Monitor (Busbars, Short Lines)
Note
:
Higher tolerances must be expected if Ι
N
= 0.1 A (device connected via summation current
transformers). Also, the device tolerances do not include measuring errors originating from
summation CTs and magnetizing currents.
Steady-state differential current monitoring
Ι
Monit
/Ι
NObj
0.15 to 0.80 Increments 0.01
Delay of blocking of differential current
T
Monit
1 s to 10 s Increments 1 s
Feeder Current Guard (Busbars, Short Lines)
Trip release by feeder current guard
Ι>
Guard
/Ι
NObj
0.20 to 2.00
or 0 (always
released)
Increments 0.01
Operating Time (Busbars, Short Lines)
7UT612
Pickup time / dropout time with single-side infeed
Pickup time at frequency 50 Hz 60 Hz
Technical Data
4.2 Differential Protection
412 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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