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