Underfrequency Protection - Siemens SIPROTEC 5 Technical Data Manual

Technical Data

11.23 Underfrequency Protection

11.23 Underfrequency Protection
Setting Values
Pickup values f<
Dropout differential
Time delay T
Minimum voltage
Times
Pickup times f<
Dropout times f<
Dropout
Frequency
Minimum voltage
The larger dropout differential (= | pickup value – dropout threshold |) of the following
2 criteria is used:
Dropout differential derived from Dropout ratio 105 % for the Minimum voltage parameter
Minimum absolute dropout differential
Operating Ranges
Voltage range
Frequency range
Tolerances
Frequency f<
f - 0.20 Hz < f < f
rated
f - 3.0 Hz < f < f
rated
Time delay T(f<)
Minimum voltage
81 OOT (Output Operating Time): Additional delay of the output medium used, for example, 5 ms with fast relays, see chapter
11.1.4 Relay Outputs
1178
+ 0.20 Hz
rated
+ 3.0 Hz
rated
40.00 Hz to 70.00 Hz
20 mHz to 2 000 mHz
0.00 s to 600.00 s
3.000 V to 175.000 V
Angle difference method
50 Hz
60 Hz
Filtering method
50 Hz
60 Hz
60 ms to 80 ms
Parameterizable dropout differential
150 mV secondary
5 V to 230 V (phase-phase)
Angle difference method
Filtering method
± 5 mHz at V = V
rated
± 10 mHz at V = V
rated
1 % of the setting value or 10 ms
1 % of the setting value or 0.5 V
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-A, Edition 05.2018
Increments of 0.01 Hz
Increments of 10 mHz
Increments of 0.01 s
Increments of 0.001 V
Approx. 70 ms + OOT 81
Approx. 60 ms + OOT
Approx. 65 ms + OOT
Approx. 54 ms + OOT
10 Hz to 80 Hz
25 Hz to 80 Hz