[scVI1ph_V1ph, 1, en_US]
Figure 5-5 Connecting Measuring Points to the Voltage-Current 1-Phase Function Group
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
N
at the broken-delta
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 5-6 Selection of the VN broken-delta Voltage Type for the 1-Phase Voltage Measuring Point
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 5-7 Connecting Measuring Points 3-Phase Voltage and 1-Phase Current to the 1-Phase Voltage-
Current Function Group
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.
Function-Group Types
5.2 Function-Group Type Voltage/current 1-Phase
204 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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