Plant Visualization
251
7SS52 V4 Manual
C53000-G1176-C182-3
Display of the
measured values
Measured value boxes are displayed for the busbars and current transformers each
consisting of three fields (phases L1, L2, L3) of the phase currents and always display
the current measured value. The first line of each measured value box shows the
name of the busbar or of the current transformer. Measured value boxes for current
transformers show the current in percent.
.
Each bus zone has one measured value box for the 3 differential currents and one for
the 3 restraint currents.
The measured value boxes of a current transformer show the actual feeder current
and also the long text of the logic group (bay name) to which the transformer is as-
signed.
You can show or hide the measured value boxes.
To show the measured value boxes:
Click
View
→
Measured Value Boxes
on the menu bar. Alternatively, you can click
the
button on the toolbar. The measured value boxes are displayed as you have
specified in the DIGSI Plant Configuration. With the measured value boxes shown,
the menu item
View
→
Measured Value Boxes
is checked off and the
com-
mand button is active.
Note
The percentages for the differential and restraint currents are referred to the
normalized current (Chapter 4.3.7, page 60) of the base CT. The percentages for the
feeder currents refer to the rated transformer current of the corresponding feeder.
Note
In the fault record, the current values are displayed from the protection's point of view,
i.e. after the algorithmic processing, for an easier analysis of the protection behaviour.
This means that, for example, the stabilization factor k in the restraint current is taken
into account.
A special feature is the restraint current of the check zone: In the extreme case (bus-
bar fault with all currents directed to the busbar), the resulting restraint current of the
check zone is even zero since the current flowing out is zero.
Note
The measured value boxes for the bus zones can only be displayed in the Plant Vis-
ualization if you have set the measured values to visible in the DIGSI Plant Configu-
ration under the object properties of the busbar.
Further information on setting the object properties can be found in the on-line help of
the DIGSI Plant Configuration.
Note
If 2 busbars are connected with each other via a sectionalizer fork, only the measured
value boxes of the busbar with the higher priority (lower number as BB1, ...) are visible.
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