Extremely inverse: type C Refer to the respective picture of the technical data for the non-
dir-OC-ground function 11.9.2 Stage with Inverse-Time Charac-
teristic Curve
Long-time inverse: type B
Long-time inverse
Moderately inverse
Very inverse
Extremely inverse
Uniformly inverse
Setting Values for Stage Types Logarithmic Inverse Time-Overcurrent Protection
Characteristic curve: see Figure 11-13
Threshold value multiplier 1.00 to 4.00 Increments of 0.01
Time multiplier 0.05 to 15.00 Increments of 0.01
Minimum time of the characteristic curve 0.000 s to 60.000 s Increments of 0.001 s
Maximum time of the characteristic curve 0.000 s to 60.000 s Increments of 0.001 s
Additional time delay 0.000 s to 60.000 s Increments of 0.001 s
[dwloginv-300913, 2, en_US]
Figure 11-13
Operate Curve of Logarithmic Inverse-Time Characteristic
Dropout value for Stage Types Logarithmic Inverse Time-Overcurrent Protection
Dropout ratio
Approx. 1.05 * threshold value
Approx. 0.95 * pickup value
Setting Values for Stage Type Logarithmic Inverse Time with Knee-Point Overcurrent Protection
Characteristic curve: see
Figure 11-14
Minimum time of the characteristic curve 0.00 s to 30.00 s Increments of 0.01 s
Knee-point time of the curve 0.00 s to 100.00 s Increments of 0.01 s
Technical Data
11.11 Directional Time-Overcurrent Protection, Ground
SIPROTEC 5, High-Voltage Bay Controller, Manual 1137
C53000-G5040-C015-9, Edition 11.2017
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