Siemens Siprotec 5 7SS85 Techical Data page 55

V Threshold value (parameter Threshold)
thresh
k Curve constant k (parameter Charact. constant k)
Curve constant α (parameter Charact. constant α)
α
c Curve constant c (parameter Charact. constant c)
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for the overvoltage and of 105 % for the
undervoltage functionality.
Minimum absolute dropout differential
Times
Operate time with time delay = 0 ms
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
Tolerances for Stage Type Definite Time-Overvoltage Protection
Voltages
Time delays
Tolerances for Stage Type Inverse Time-Overvoltage Protection
Voltages
Operate time for
1.2 ≤ V/V threshold value ≤ 20
Reset time delay
28 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
rated
11.19 Overvoltage Protection with 3-Phase Voltage
150 mV sec.
Approx. 25 ms + OOT 28 at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Approx. 20 ms + OOT
According to specified tolerances
Slightly expanded tolerances
Active
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
5 % of the setting value or 30 ms
1 % of the setting value or 10 ms
11.1.4 Relay Outputs
Technical Data
599