Connecting Measuring Points to a Function Group
The following figure shows the connection of the function group Generator stator with several measuring
points in DIGSI. The ID of each measuring point appears in the brackets after the name.
[sc_VBStoFG, 1, en_US]
Figure 9-21 Connecting the Measuring Points to the Generator Stator Function Group
There are consistency checks that validate the connections of voltage measuring points to the function group:
•
The connection type must be identical for all measuring points connected to the same interface of the
function group.
•
The rated voltage (primary and secondary) must be identical for all measuring points connected to the
same interface.
•
2 voltage measuring points must be connected to one voltage interface.
•
Either the Voltage-comparison supervision function or the Voltage measuring-point selection func-
tion must be instantiated. They must not be instantiated at the same time.
About the Voltage measuring-point selection function, you can find more information in chapter
6.51 Voltage Measuring-Point Selection.
Voltage Selection
2 voltage measuring points are connected to a voltage interface of a function group. In the Voltage-compar-
ison supervision function, you can set one of the voltages as the reference voltage via the parameter Refer-
ence voltage, and the other voltage becomes the main voltage.
•
The reference voltage is used for voltage comparison.
•
The main voltage is used for all voltage-related functions in the FGs that contain the Voltage-compar-
ison supervision function.
If the main voltage transformer is disconnected, the Voltage-comparison supervision function issues
the blocking signal
Meas.-volt failure
. The signal is transmitted to all voltage-related protection
functions which are used in the same FGs as the Voltage-comparison supervision.
Supervision Functions
9.3 Supervision of the Secondary System
SIPROTEC 5, Overcurrent Protection, Manual 1267
C53000-G5040-C017-8, Edition 07.2017
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