Undervoltage Protection with 3-Phase Voltage
Setting Values for Stage Type Definite Time-Undervoltage Protection
Measured value Phase-to-phase
Phase-to-ground
Method of measurement Fundamental component
RMS value
Current-flow criterion On
Off
Pickup value
35
0.300 V to 175.000 V Increments of 0.001 V
Time delay 0.00 s to 60.00 s Increments of 0.01 s
Dropout ratio 1.01 to 1.20 Increments of 0.01
Setting Values for Stage Type Inverse Time-Undervoltage Protection
Measured value Phase-to-phase
Phase-to-ground
Method of measurement Fundamental component
RMS value
Pickup value 0.300 V to 175.000 V Increments of 0.001 V
Pickup factor 0.80 to 1.00 Increments of 0.01
Characteristic constant k 0.00 to 300.00 Increments of 0.01
Characteristic constan α 0.010 to 5.000 Increments of 0.001
Characteristic constant c 0.000 to 5.000 Increments of 0.001
Time multiplier 0.05 to 15.00 Increments of 0.01
Additional time delay 0.00 s to 60.00 s Increments of 0.01 s
Reset time 0.00 s to 60.00 s Increments of 0.01 s
Operate Curve
T
op
=T
Inv
+ T
add
Where:
T
op
Operate delay
T
Inv
Inverse-time delay
T
add
Additional time delay (Parameter Additional time delay)
[fo_UVP3ph_1_3pol_inverse, 1, en_US]
Where
T
Inv
Inverse-time delay
T
p
Time multiplier (Parameter Time dial)
V Measured undervoltage
V
Thresh
Threshold value (Parameter Threshold)
k Curve constant k (Parameter Charact. constant k)
11.24
35
If you have selected the Method of measurement = RMS value, do not set the threshold value to less than 10 V.
Technical Data
11.24 Undervoltage Protection with 3-Phase Voltage
604 SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016
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