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
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