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