Control During Operation
232
7SS52 V4 Manual
C53000-G1176-C182-3
from the PC
with DIGSI
To block the breaker failure protection via the central unit (PC linked to central unit)
proceed as follows:
Click Control in the navigation window.
Double-click Tagging in the function selection. The Tagging window opens (see
Figure 6-17, page 229).
To block the breaker failure protection, click the command button ON in the corre-
sponding row. To reset the blocking of the breaker failure protection, click the com-
mand button OFF. Next a security prompt takes place.
Click Yes to apply the command. The blocking of the TRIP command can be pro-
tected by the password for switching/selecting/updating. If you have activated this
password, you will be prompted to enter it before the command is first executed af-
ter a connection was established. A dialog box opens for this purpose.
Enter the correct password in the box named Password and then click OK. If the
password is wrong, you will receive an error message. When the password is cor-
rect, the command will be executed.
6.3.2.3 Blocking of Individual Busbar Sections
Individual busbar sections can be blocked for special conditions or for test purposes.
To do so, binary inputs of the central unit have to be configured ">Blk $03” (FNo.
177.1334/CU). The blocking is done for every three phases and is retained beyond
a device restart.
The differential protection of respective bus bars is affected by the blocking. All of the
self-monitoring functions and the check zones stay active. In case of an error on the
blocked bus bar, the tripping of the selective measuring module is inhibited. The check
zone outputs its trip command. The blocking is indicated by the annunciation
"$03 blocked BI” (FNo. 177.1335/CU)..
Note
You can also block the breaker failure protection via the operator panel of the central
unit. If you want to know more on this topic, please read the System Description /1/.
Caution!
The blocking is not "commuted", e.g. in the case of the preference of a measuring
system by inserting a sectionalizer fork (connection of two busbars via an isolator).
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