Function-Group Type Voltage 3-Phase
Overview
In the Voltage 3-phase function group, all functions can be used for protecting and for monitoring a
protected object or equipment which allows a 3-phase voltage measurement. The function group also
contains the operational measurement for the protected object or equipment (on this topic, see chapter
10 Measured Values, Energy Values, and Supervision of the Primary System). Applicable functions are, for
example, Voltage protection or Frequency protection.
Structure of the Function Group
The Voltage 3-phase function group has interfaces to the measuring points and the Circuit-breaker function
group.
[dw3spann-300913, 1, en_US]
Figure 5-10 Structure of the Voltage 3-Phase Function Group
Interface with Measuring Points
You connect the Voltage 3-phase function group to the voltage measuring points via the interface to the
measuring points. This assignment can only be made in DIGSI via Project tree → Function group connec-
tions. To connect the interfaces, set a cross at the intersection between the row and column in the matrix.
[sc3span1-190214-01, 1, en_US]
Figure 5-11 Connecting Measuring Points to the Voltage 3-Phase Function Group
If you add functions to the Voltage 3-phase function group, these are connected to the measuring point auto-
matically.
You can connect multiple measuring points with this interface. You can find more information in chapter
6.51 Voltage Measuring-Point Selection.
The measurands from the 3-phase voltage system are supplied via the V 3-ph interface. Depending on the
type of transformer connections, these are, for example, V
A
, V
B
, V
C
, V
gnd
. All values that can be calculated from
the measurands are also provided via this interface.
Interface to the Circuit-Breaker Function Group
All required data is exchanged between the Voltage 3-phase function group and the Circuit-breaker function
group via the interface of the Circuit-breaker function group.
5.3
5.3.1
5.3.2
Function-Group Types
5.3 Function-Group Type Voltage 3-Phase
SIPROTEC 5, Overcurrent Protection, Manual 209
C53000-G5040-C017-8, Edition 07.2017
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