The following table shows the properties of the voltage input for the Voltage-current 1-phase function group
depending on the connection types.
Connection Type of the 3-
Phase Voltage Measuring
Point
Voltage Input
3 ph-to-gnd voltages The zero-sequence voltage is calculated from the phase-to-ground voltages
and used as a voltage input for all functions.
3 ph-to-gnd volt. + VN The residual voltage VN is converted into the voltage equivalent of the zero-
sequence voltage. This converted voltage is used as a voltage input for func-
tions.
3 ph-to-ph volt. + VN
Interface to the Circuit-Breaker Function Group
All required data is exchanged between the Voltage-current 1-phase function group and the Circuit-breaker
function group via the interface of the Circuit-breaker function group.
In this example, the pickup and operate indications of the protection functions are exchanged in the direction
of the Circuit-breaker function group.
You must connect the Voltage-current 1-phase function group with the Circuit-breaker function group. This
assignment can only be made in DIGSI via Project tree → Function group connections. To connect the inter-
faces, set a cross at the intersection between the row and column in the matrix. If the interface is not
connected, the functions operate as supervision functions in the Voltage-current 1-phase function group.
[sc1stspc-190214-01, 1, en_US]
Figure 5-11 Connecting Voltage-Current 1-Phase Function Group with Circuit-Breaker Function Group
Fundamental Components
The fundamental components are always present in the Voltage-current 1-phase function group and cannot
be deleted.
The following table shows the fundamental components of the Voltage-current 1-phase function group:
Table 5-2
Fundamental Components of the Voltage-Current 1-Phase Function Group
Measured Values Primary Secondary % Referring to
I 1-phase current A A Parameter Rated operating current
V
9
1-phase voltage kV V Parameter Rated operating voltage
V
0
10
Zero-sequence voltage kV V Parameter Rated operating
voltage /√3
V
N
11
Residual Voltage kV V Parameter Rated operating
voltage /√3
You can find the parameters Rated operating current and Rated operating voltage in the
General function block of theVoltage-current 1-phase function group.
9
The 1-phase voltage V is only visible if it is connected to a 1-phase voltage measuring point.
10
The zero-sequence voltage V0 is only visible if it is connected to a 3-phase voltage measuring point with the 3-phase phase-to-ground
voltage connection type.
11
The residual voltage VN is only visible if it is connected to a 3-phase voltage measuring point with the connection type 3-phase phase-
to-ground voltage + VN or 3-phase phase-to-phase voltage + VN.
Function-Group Types
5.3 Function-Group Type Voltage/current 1-Phase
202 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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