Siemens 6MD85 Manual page 201

[scVI1ph_V1ph, 1, en_US]
Figure 5-8
If you select the voltage type VN broken-delta for the 1-phase voltage measuring point in the measuring
point routing (see the following figure), the device measures the residual voltage V
winding. The residual voltage is converted into the voltage equivalent of the zero-sequence voltage. This
converted voltage is used as the voltage input for all functions in the Voltage-current 1-phase function
group.
[scvnopen, 1, en_US]
Figure 5-9
The zero-sequence voltage calculated from the 3-phase voltage system or the measured residual voltage is
available via the voltage interface (see figure below).
[scVI1ph_V3ph, 1, en_US]
Figure 5-10
You can connect the voltage interface of the Voltage-current 1-phase function group with precisely one 3-
phase voltage measuring point. 3 types of 3-phase voltage measuring-point connection are supported. With
the different connection types, the type of voltage input for the functions in the Voltage-current 1-phase
function group also changes.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Connecting Measuring Points to the Voltage-Current 1-Phase Function Group
Selection of the VN broken-delta Voltage Type for the 1-Phase Voltage Measuring Point
Connecting Measuring Points 3-Phase Voltage and 1-Phase Current to the 1-Phase Voltage-
Current Function Group
Function-Group Types
5.3 Function-Group Type Voltage/current 1-Phase
at the broken-delta
N
201