Siemens SIPROTEC 4 7UT6 Series, Руководство пользователя

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For the zero sequence current
3I0p
the characteristic can be selected independently of the characteristic used
for the phase currents.
The pickup values of the stages
Ip
(phases) and
3I0p
(zero sequence current) and the time multipliers valid
for each of these states can be set individually.
Figure 2-71 and Figure 2-72 show the logic diagrams of the inverse overcurrent time protection for phase
currents
Ip
and for the zero sequence currents
3I0p
.
[logik-umz-abh-amz-phasenstrom-iec-kennlinie-121102-st, 1, en_GB]
Figure 2-71 Logic diagram of the inverse overcurrent protection for phase currents — example of IEC char-
acteristic (simplified)
Functions
2.4 Time Overcurrent Protection for Phase and Residual Currents
SIPROTEC 4, 7UT6x, Manual 141
C53000-G1176-C230-5, Edition 09.2016