Undervoltage Protection
Setting Ranges/Increments
Measured Quantity Fundamental component of one of the undervoltage
voltages connected to the measuring inputs (selectable)
Pickup thresholds U<, U<< 10.0 V to 125.0 V Increments 0.1 V
Dropout ratio RV U<, U<< 1.01 to 1.20 Increments 0.01
Time Delays T U<, T U<< 0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
The set times are pure delay times.
Operating Times
Pickup times/dropout times approx. 55 ms at f
N
= 50 Hz
approx. 48 ms at f
N
= 60 Hz
approx. 145 ms at f
N
= 16.7 Hz
Tolerances
Pickup voltages U<, U<< 1 % of setting value or 0.5 V
Delay times T 1 % of setting value or 10 ms
Influencing Variables for Pickup Values
Power supply direct voltage in range 0.8 ≤ U
Aux
/U
AuxN
≤ 1.15 ≤ 1 %
Temperature in range –5 °C ≤ Θ
amb
≤ 55 °C ≤ 0.5 %/10 K
Frequency in range 0.95 ≤ f/f
N
≤ 1.05 ≤ 1 %
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
≤ 1 %
≤ 1 %
4.4
Technical Data
4.4 Undervoltage Protection
206 SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017
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