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Basic Structure of the Function
2.1 Function Embedding in the Device
Interface Between Function Group and Measuring Point
The function groups receive the measurands of the current and voltage transformers from measuring points.
For this, the function groups are connected to one or more measuring points.
The number of measuring points and the assignment of function groups to the measuring points are preset by
the selected application template in accordance with the specific application. Therefore, this specifies which
measuring point(s) and the corresponding measurands have to be used by which function within the function
group.
EXAMPLE
The measuring points are assigned to the function groups in the application template in
•
The protection function group Line is assigned to the measuring points I-3ph 1, I-3ph 2 and V-3ph 1. The
function group therefore receives the measured values from current transformers 1 and 2 and from
voltage transformer 1. The currents of measuring points I-3ph 1 and I-3ph 2 are added geometrically for
feeder-related processing.
•
The circuit-breaker function group QA1 is assigned to the measuring point I-3ph 1 and receives the
measured values from current transformer 1.
•
The circuit-breaker function group QA2 is assigned to the measuring point I-3ph 2 and receives the
measured values from current transformer 2.
The user can change the assignment as needed, that is, function groups can be assigned to any available
measuring points of the device.
To check or change the assignment of measuring points to the function groups, double-click Function-group
connections in the DIGSI 5 project tree.
[scfgverb-190214-01, 1, en_US]
Figure 2-2
The window for routing of the measuring points opens in the working area (see the following Figure, does not
correspond to the example).
46
Project Tree in DIGSI 5 (Detail)
Figure 2-1
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
as follows:
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