Technical Data
4.9 Earth Fault Protection in Earthed Systems (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
606
Figure 4-5 Trip time characteristic of the inverse time overcurrent stage with logarithmic-inverse charac-
teristic
Logarithmic inverse t = T
3I0Pmax
— T
3I0P
·ln(I/3I0P)
Note: For I/3I0P > 35, the time for I/3I0P = 35 applies
Figure 4-6 Trip time characteristics of the zero sequence voltage protection U
0 inverse
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