Siemens SIPROTEC 5 Technical Data Manual page 56

Minimum time of the curve
Additional time delay
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout
Minimum absolute dropout differential
Protection-class current transformer
Instrument current transformer
Reset of the Integration Timer
Instantaneous
Disk emulation
Operate Curves and Dropout-Time Characteristic Curves according to IEC
Normal inverse: type A
Very inverse: type B
Extremely inverse: type C
Long-time inverse: type B
Operate Curves and Dropout-Time Characteristic Curves according to ANSI/IEEE
Inverse: type C
Short inverse
Long inverse
Moderately inverse
Very inverse
Extremely inverse
Definite inverse
Times
The maximum pickup time with operate delay = 0 ms Approx. 30 ms + OOT at 50 Hz
Extension of the operate time during operation with
inrush-current detection
Dropout time
Frequency Operating Range
0.9 ≤ f/f ≤ 1.1
rated
10 Hz ≤ f < 0.9 f
1.1 f < f ≤ 80 Hz
rated
f < 10 Hz
f > 80 Hz
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-A, Edition 05.2018
rated
11.11 Directional Overcurrent Protection, Ground
0.00 s to 1.00 s
0.00 s to 60.00 s
95 % of 1.1 ⋅ threshold value
15 mA sec. (I = 1 A) or
rated
75 mA sec. (I = 5 A)
rated
0.5 mA sec. (I = 1 A) or
rated
2.5 mA sec. (I = 5 A)
rated
With dropout
Approx. < 0.90 ⋅ threshold value
Refer to the respective figure of the technical data for
the non-dir-OC-ground function
Inverse-Time Characteristic Curve
Refer to the respective figure of the technical data for
the non-dir-OC-ground function
Inverse-Time Characteristic Curve
Approx. 25 ms + OOT at 60 Hz
Approx. 10 ms
Approx. 20 ms + OOT
According to specified tolerances
Slightly expanded tolerances
Active with reduced sensitivity
Technical Data
Increments of 0.01 s
Increments of 0.01 s
11.9.2 Stage with
11.9.2 Stage with
1151