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Inverse Time Over-
The inverse logarithmic characteristic differs from the other inverse characteristics
current Stage with
mainly by the fact that the shape of the curve can be influenced by a number of pa-
rameters. The slope and a time shift 3I0p MaxT-DELAY which directly affect the
Logarithmic–
Inverse Character-
curve, can be changed. The characteristics are shown in the Technical Data.
istic
Figure 2-90 shows the logic diagram. In addition to the curve parameters, a minimum
time 3I0p MinT-DELAY can be determined; below this time no tripping can occur.
Below a current factor of 3I0p Startpoint, which is set as a multiple of the basic
setting 3I0p PICKUP, no tripping can take place.
Further information regarding the effect of the various parameters can be found in the
setting information of the function parameters in Section 2.8.2.
The remaining setting options are the same as for the other curves.
Figure 2-90
Logic diagram of the 3I
7SD5 Manual
C53000-G1176-C169-1
2.8 Earth Fault Protection in Earthed Systems (optional)
stage for the inverse logarithmic characteristic
0P
211
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