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
Setting Values for Stage Types
Threshold 0.100 Hz/s to 20.000 Hz/s Increments of 0.025 Hz/s
Dropout differential 0.02 Hz/s to 0.99 Hz/s Increments of 0.01 Hz/s
Operate delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout
Frequency Parameterizable dropout differential
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 150 mV secondary
Times
Pickup time
Approx. 160 ms + OOT
64
to 220 ms + OOT (depends on measuring
window length)
at 50 Hz
Approx. 140 ms + OOT to 200 ms + OOT (depends on measuring
window length)
at 60 Hz
Dropout time Approx. 160 ms + OOT to 220 ms + OOT (depends on measuring
window length)
at 50 Hz
Approx. 140 ms + OOT to 200 ms + OOT (depends on measuring
window length)
at 60 Hz
Frequency Operating Range
0.9 ≤ f/f
rated
≤ 1.1 According to specified tolerances
10 Hz ≤ f < 0.9 f
rated
1.1 f
rated
< f ≤ 80 Hz
Slightly expanded tolerances
f < 10 Hz
f > 80 Hz
Inactive
Tolerances
Threshold,
measuring window > 3 periods
Approx. 3 % or 0.060 Hz/s
Threshold,
measuring window ≤ 3 periods
Approx. 5 % or 0.060 Hz/s
12.15
64
OOT (Output Operating Time): Additional delay of the output medium used, for example, 5 ms with fast relays, see chapter
12.1.4 Relay Outputs
Technical Data
12.15 Rate of Frequency Change Protection
SIPROTEC 5, Paralleling Device, Manual 757
C53000-H5040-C071-1, Edition 05.2018
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