Underfrequency Protection
Setting Values
Pickup values f< 30.00 Hz to 70.00 Hz Increments of 0.01 Hz
Dropout differential 20 mHz to 2 000 mHz Increments of 10 mHz
Time delay T 0.00 s to 600.00 s Increments of 0.01 s
Minimum voltage 3.000 V to 175.000 V Increments of 0.001 V
Times
Pickup times f< Angle difference method
50 Hz
60 Hz
Approx. 70 ms + OOT
64
Approx. 60 ms + OOT
Filtering method
50 Hz
60 Hz
Approx. 75 ms + OOT
Approx. 64 ms + OOT
Dropout times f< 60 ms to 80 ms
Dropout
The larger dropout differential (= | pickup value – dropout threshold |) of the following 2 criteria
is used:
Dropout differential derived from the parameter
Dropout ratio
If this parameter is not present, a dropout ratio of 100.03 % applies to the underfrequency protection.
Minimum absolute dropout differential 5 mHz
Operating Ranges
Voltage range
5 V to 230 V (phase-phase)
Frequency range Angle difference method 10 Hz to 90 Hz
Filtering method 25 Hz to 80 Hz
Tolerances
Frequency f<
f
rated
- 0.20 Hz < f < f
rated
+ 0.20 Hz ± 5 mHz at V = V
rated
f
rated
- 3.0 Hz < f < f
rated
+ 3.0 Hz ± 10 mHz at V = V
rated
Time delay T(f<) 1 % of the setting value or 10 ms
Minimum voltage 1 % of the setting value or 0.5 V
Rate of Frequency Change Protection
Setting Values for the Function
Minimum voltage
3.000 V to 175.000 V Increments of 0.001 V
Measuring window 2 periods to 5 periods Increments of 1 period
11.20.2
11.20.3
64
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
Technical Data
11.20 Frequency Protection
968 SIPROTEC 5, Low-Impedance Busbar Protection, Manual
C53000-G5040-C019-C, Edition 04.2021
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