Overfrequency Protection
Setting Values
Pickup values f> 40.00 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
40
Approx. 60 ms + OOT
Filtering method
50 Hz
60 Hz
Approx. 75 ms + OOT
Approx. 75 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
Dropout ratio parameter
If this parameter is not available, a dropout ratio of 95 % applies to the overvoltage protection and a dropout
ratio of 105 % applies to the undervoltage protection.
Minimum absolute dropout differential 150 mV sec.
Operating Ranges
Voltage range
5 V to 230 V (phase-phase)
Frequency range Angle difference method 10 Hz to 80 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
11.27
40
OOT (Output Operating Time) Additional delay of the output medium used, for example 5 ms with fast relay, see chapter 11.1.4 Relay
Outputs
Technical Data
11.27 Overfrequency Protection
608 SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016
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