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Tolerances for Stage Type Inverse Time-Undervoltage Protection
Voltages
Currents
Operate time for 0 < V/V
Reset time delay
Undervoltage Protection with Positive-Sequence Voltage
12.10.7
Setting Values
Threshold value
Time delay
Dropout ratio
Current-flow criterion
Threshold value I>
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for the overvoltage and of 105 % for the
undervoltage functionality.
Minimum absolute dropout differential
Times
Operate time with time delay = 0 ms, typical
Operate time with time delay = 0 ms, maximum
Dropout time, typical
Dropout time, maximum
Frequency Operating Range
0.9 ≤ f/f
≤ 1.1
rated
10 Hz ≤ f < 0.9 f
1.1 f
< f ≤ 90 Hz
rated
f < 10 Hz
f > 90 Hz
66
OOT (Output Operating Time): additional delay of the output medium used, see Chapter
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
0.5 % of the setting value or 0.05 V
1 % of the setting value or 5 mA (I
10 %), valid for protection-class current transformers
1 % of the setting value or 0.1 mA (I
f
± 10 %), valid for instrument transformers
rated
< 0.9
5 % of the setting value or 30 ms
Thresh
1 % of the setting value or 10 ms
I
= 1 A
rated
I
= 5 A
rated
rated
= 1 A) or 25 mA (I
rated
= 1.6 A) or 0.5 mA (I
rated
0.300 V to 200.000 V
0.00 s to 60.00 s
1.01 to 1.20
On
Off
0.030 A to 10.000 A
0.15 A to 50.00 A
150 mV sec.
66
Approx. 25 ms + OOT
at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Approx. 30 ms + OOT at 50 Hz
Approx. 26 ms + OOT at 60 Hz
Approx. 25 ms + OOT
Approx. 30 ms + OOT
According to specified tolerances
Slightly expanded tolerances
Inactive, maintained;
Dropout of the pickup induced by blocking or by
increasing the measurand beyond the dropout
threshold
12.1.4 Relay Outputs
Technical Data
12.10 Voltage Protection
= 5 A, f
±
rated
rated
= 8 A,
rated
Increments of 0.001 V
Increments of 0.01 s
Increments of 0.01
Increments of 0.001 A
Increments of 0.01 A
841
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