Siemens 6MD85, Manual

Page: 1155 / 1256

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
Threshold value I> 1 A @ 50 and 100 Irated 0.030 A to 10.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 50.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.005 A to 8.000 A Increments of 0.001 A
Threshold value 75
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
Current-flow criterion On
Off
Threshold value I> 1 A @ 50 and 100 Irated 0.030 A to 10.000 A Increments of 0.001 A
5 A @ 50 and 100 Irated 0.15 A to 50.00 A Increments of 0.01 A
1 A @ 1.6 Irated 0.001 A to 1.600 A Increments of 0.001 A
5 A @ 1.6 Irated 0.005 A to 8.000 A Increments of 0.001 A
Threshold 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 constant 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
)
11.20
75 If you have selected the Method of measurement = RMS value, do not set the threshold value under 10 V.
Technical Data
11.20 Undervoltage Protection with 3-Phase Voltage
SIPROTEC 5, High-Voltage Bay Controller, Manual 1155
C53000-G5040-C015-9, Edition 11.2017