Technical Data
4.15 Undervoltage Protection (ANSI 27)
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
488
4.15 Undervoltage Protection (ANSI 27)
Setting Ranges / Increments
Operating Times
Dropout Ratio
Tripping Characteristic
Tolerances
Measured Quantity Positive Sequence phase-to-earth voltages as
phase-to-phase Values
Pickup voltages U<, U<<, Up< 10.0 V to 125.0 V Increments 0.1 V
Rückfallverhältnis RV U< (nur Stufen U<, U<<) 1.01 to 1.20 Increments 0.01
Time delays T U<, T U<< 0.00 s to 60.0 s
or ∞ (ineffective)
Increments 0.01 s
Time multiplication factor T
MUL
for Inverse Characteristic 0.10 s to 5.00 s Increments 0.01 s
Additional delay time T
Up
< for Inverse Characteristic 0.00 s to 60.00 s
or ∞ (ineffective)
Increments 0.01 s
The set times are pure delay times.
Pickup Times approx. 50 ms
Dropout Times approx. 50 ms
from the pickup value of the inverse characteristic 1.01 or 0.5 V absolute
see also Figure 4-12
Pickup voltages U<, U<<, Up< 1 % of setting value or 0.5 V
Time delays T, T
Up
< 1 % of setting value or 10 ms
Voltage-Time Characteristic 1 % based on U, or 30 ms
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