Functions
126
7SS52 V4 Manual
C53000-G1176-C182-1
With the parameter T-BF CB fault (XX24/CU), the delay time of the breaker failure
protection can be reduced.
A TRIP command from the bay unit issues at the same time a transfer trip command
to trip the remote end (Figure 5-22, page 120).
5.3.6 Setting Notes
BF BI MODE The parameter BF BI MODE (XX14/CU) is used to select the supervision mode for
initiation of the breaker failure protection.
With setting 1-ch w/o sup, the breaker failure protection will be initiated only by the
feeder-selective binary input, without time supervision.
With setting 1-ch w sup, the breaker failure protection will be initiated only by the
feeder-selective binary input, with time supervision.
With setting 2-ch w/o sup, the breaker failure protection will be initiated after eval-
uation of an additional binary input ("CBF release"), without time supervision.
With setting 2-ch w sup, the breaker failure protection will be initiated after evalua-
tion of an additional binary input ("CBF release"), with time supervision.
For testing purposes, Siemens recommends to set this parameter to 1-ch w/o sup
or 2-ch w/o sup.
BF OP MODE The parameter BF OP MODE (XX15/CU) is used to select the operating mode for the
breaker failure protection in the bay unit. The parameter setting depends on the pro-
tection concept in use.
With setting non existent the breaker failure protection will be deactivated.
With setting I>query the I> query mode is activated.
With setting trip rep/I>quer the TRIP repetition with subsequent I> query mode
is activated.
With setting BZ unbalance the unbalancing mode is activated.
With setting trip rep/unbal the TRIP repetition with subsequent unbalancing
mode is activated.
With setting external the breaker failure protection will be provided by an external
device.
Note
The operating modes "... without supervision” are recommended for test purposes
only.
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