Undervoltage Protection - Siemens SIPROTEC 4 7UT6 Series Manual

4.14

Undervoltage Protection

Setting Ranges / Increments
Measured quantity
Pickup Thresholds U<, U<<
Dropout Ratios DR
(only stages U<, U<<)
Time Delays T U<, T U<<
The set times are pure delay times with definite time protection.
Times
Pickup times
Dropout times
Tolerances
Pickup voltages U<, U<<
Delay times T
Influencing Variables for Pickup Values
Power supply direct voltage in range
0.8 ≤ U /U ≤ 1.15
H HN
Temperature in range
–5 °C ≤ Θ ≤ 55 °C
amb
Frequency in range 0.95 ≤ f/f
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Positive Sequence phase-to-earth voltages as
phase-tophase values
10.0 V to 125.0 V
1.01 to 1.20
0.00 s to 60.0 s
or ∞ (unwirksam)
50/60 Hz
16.7 Hz
50/60 Hz
16.7 Hz
1 % of setting value or 0.5 V
1 % of setting value or 10 ms
≤ 1 %
≤ 0.5 %/10 K
≤ 1.05 ≤ 1 %
N
≤ 1 %
≤ 1 %
Technical Data
4.14 Undervoltage Protection
Increments 0.1 V
Increments 0.01
Increments 0.01 s
approx. 30 ms
approx. 70 ms
approx. 30 ms
approx. 70 ms
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