Control During Operation
230
7SS52 V4 Manual
C53000-G1176-C182-3
6.3.2.2 Blocking the Breaker Failure Protection
The external trip of the breaker failure protection can be blocked for the entire protec-
tion or busbar-selectively
With the external trip of the breaker failure protection blocked, all device-internal pro-
tection functions (central unit, bay unit) remain active. However, there is no trip of the
breaker failure protection inititated, i.e. the breaker failure protection relays configured
in the bay units are not activated. This is useful e.g. during the commissioning phase.
Blocking Breaker
Failure Protection -
entire protection
The blocking of the breaker failure protection for the entire protection is blocked via
the tagging “Blocking BF“ (FNo. 10431/CU) or via a binary input “>Blocking BF“
(FNo. 10430/CU). The blocking is indicated by the annunciation “TRIP blocked“
(FNo. 10432/CU).
Blocking Breaker
Failure Protection -
busbar-selectively
The busbar-selective blocking of the breaker failure protection can be done at the cen-
tral unit for the connected bay units as well as at the bay units directly via DIGSI, binary
input or local operation.
The blocking via the central unit is done via “BlkBF BB $00” (FNo. 176.1349/CU)
or via a binary input “>Blk BF $03” (FNo. 177.1346/CU) and is indicated by the
annunciation "$03 BlkdBF" (FNo. 177.1348/CU) or "BF blocked" (FNo.
10432/CU).
The blocking via the bay unit is done via “>Blk.BF of BB” (FNo. 7690/BU) or
“BLOCKAGE ON?” (FNo. 4301/BU) and is indicated by the annunciation "BF BZ
blkd." (FNo. 7658/BU).
In the case of a restart or a power failure the tagging “Blocking BF” is retained. The
tagging is erased in the case of an initial start.
When blocking exists, changes in the isolator of the blocked bus section are not per-
mitted. The message "IsoProhib G (FNo. 10471/CU)" is outputted.
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