Siemens Siprotec 5 7SS85, Technical Data Manual

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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
65
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 ≤ 90 Hz
Slightly expanded tolerances
f < 10 Hz
f > 90 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
Minimum voltage 1 % of the setting value or 0.5 V
Time delays 1 % of the setting value or 10 ms
Functional Measured Value
Value Description
df/dt Calculated rate of frequency change
65
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
SIPROTEC 5, Low-Impedance Busbar Protection, Manual 969
C53000-G5040-C019-C, Edition 04.2021