Measuring-Voltage Failure Detection
Setting Values
3ph.fail. - VA,VB,VC < 0.300 V to 340 000 V Increments of 0.001 V
3ph.fail. - phs.curr.release 1 A @ 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
3ph.fail. - phs.curr. jump 1 A @ 100 Irated 0.030 A to 35.000 A Increments of 0.001 A
5 A @ 100 Irated 0.15 A to 175.00 A Increments of 0.01 A
Asym.fail. - time delay 0.00 s to 30.00 s Increments of 0.01 s
SO 3ph.fail. - time delay 0.00 s to 30.00 s Increments of 0.01 s
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 available, a dropout ratio of 95 % applies to the current threshold value and a dropout
ratio of 105 % applies to the voltage threshold value.
Minimum absolute dropout differential 150 mV sec.
Times
Pickup time
Approx. 10 ms + OOT
67
at 50 Hz
Approx. 10 ms + OOT at 60 Hz
Dropout time Approx. 20 ms + OOT
Times
Use in function group
Line
Pickup time
Approx. 10 ms + OOT
68
at 50 Hz
Approx. 9 ms + OOT at 60 Hz
Use in other function group types
Pickup time
Approx. 20 ms + OOT
69
at 50 Hz
Approx. 18 ms + OOT 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
Active
11.22
67
OOT (Output Operating Time) Additional delay of the output medium used, see chapter 11.1.4 Relay Outputs
68
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
69
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
11.22 Measuring-Voltage Failure Detection
SIPROTEC 5, Low-Impedance Busbar Protection, Manual 971
C53000-G5040-C019-C, Edition 04.2021
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