Rate Of Frequency Change Protection - Siemens 6MD85 Manual

11.25

Rate of Frequency Change Protection

Setting Values for the Function
Minimum voltage
Measuring window
Setting Values for Stage Types
Threshold
Dropout differential
Operate delay
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
Times
Pickup time
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
Threshold,
measuring window > 3 periods
Threshold,
measuring window ≤ 3 periods
82 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
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
3.000 V to 175.000 V
2 periods to 5 periods
0.100 Hz/s to 20.000 Hz/s
0.02 Hz/s to 0.99 Hz/s
0.00 s to 60.00 s
Approx. 160 ms + OOT
window length)
at 50 Hz
Approx. 140 ms + OOT to 200 ms + OOT (depends on measuring
window length)
at 60 Hz
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
According to specified tolerances
Slightly expanded tolerances
rated
Inactive
Approx. 3 % or 0.060 Hz/s
Approx. 5 % or 0.060 Hz/s
11.25 Rate of Frequency Change Protection
Increments of 0.001 V
Increments of 1 period
Increments of 0.025 Hz/s
Increments of 0.01 Hz/s
Increments of 0.01 s
Parameterizable dropout differential
150 mV secondary
82 to 220 ms + OOT (depends on measuring
Technical Data
1163