Undervoltage Protection (Ansi 27) - Siemens Siprotec 7UM611 Manual

4.10

Undervoltage Protection (ANSI 27)

Setting Ranges / Increments
Operating Times
Tolerances
Influencing Variables
7UM61 Manual
C53000-G1176-C127-3
Measured Quantity
Pickup thresholds U, U<<, Up<
Dropout ratio RV U<
(only stages U<, U<<)
Time Delays T U<, T U<<
The set times are pure delay times.
Pickup Times
Dropout Times
Pickup voltages U<, U<<
Delay times T
Auxiliary DC voltage in range
0.8 ≤ U ≤ 1.15
/U
Aux AuxN
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
4.10 Undervoltage Protection (ANSI 27)
Positive Sequence phase-to-earth voltages as
phase-to-phase values
10.0 V to 125.0 V
1.01 to 1.20
0.00 s to 60.00 s
or ∞ (ineffective)
approx. 50 ms
approx. 50 ms
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 %
Increments 0.1V
Increments 0.01
Increments 0.01 s
323