Siemens Siprotec 5 7SS85 Techical Data page 61

α
c
Times
Operate time
Dropout time
Frequency Operating Range
0.9 f/f to 1.1 f/f
rated
10 Hz to 0.9 f/f
1.1 f/f to 80 Hz
rated
f < 10 Hz
f > 80 Hz
Tolerances for Stage Type Definite Time-Undervoltage Protection
Voltages
Time delays
Tolerances for Stage Type Inverse Time-Undervoltage Protection
Voltages
Operate time for 0 < V/V
Reset time delay
36 OOT (Output Operating Time) additional delay of the output medium used, see Chapter
SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016
Curve constant α (Parameter Charact. constant α)
Curve constant c (Parameter Charact. constant c)
Approx. 25 ms + OOT
Approx. 22 ms + OOT at 60 Hz
Approx. 20 ms + OOT
According to specified tolerances
rated
Slightly expanded tolerances
rated
Inactive, maintained;
Dropout of the pickup induced by blocking or by increasing the meas-
urand beyond the dropout threshold
0.5 % of the setting value or 0.05 V
1 % of the setting value or 10 ms
0.5 % of the setting value or 0.05 V
< 0.9 5 % of the setting value or 30 ms
Thresh
1 % of the setting value or 10 ms
11.24 Undervoltage Protection with 3-Phase Voltage
36 at 50 Hz
11.1.4 Relay Outputs
Technical Data
605