Functions
200
7SS52 V4 Manual
C53000-G1176-C182-1
5.18.2 Setting Notes
BackUp CBF The parameter BackUp CBF (3901/BU) is used to activate and deactivate the break-
er failure protection of the bay unit.
B.U.CBF-I The parameter B.U.CBF-I (3911/BU) is used to set the current threshold for the
breaker failure protection of the bay unit. In the case of a circuit breaker malfunction,
the TRIP repetition of the backup breaker failure protection is zero.
When setting this parameter, you should also consider the corresponding parameter
of the breaker failure protection in the central unit, so that the two protection functions
complement each other in a meaningful way. Siemens therefore recommends to
match the value in the bay unit to its counterpart in the central unit.
B.U.CBF-T The parameter B.U.CBF-T (3912/BU) is used to set the delay time for the breaker
failure protection of the bay unit.
When setting this parameter, you should also consider the corresponding parameter
of the breaker failure protection in the central unit, so that the two protection functions
complement each other in a meaningful way. Siemens therefore recommends to
match the value in the bay unit to its counterpart in the central unit.
5.18.3 Settings of the Central Unit
Addr. Setting Title Setting Options Default Settings Comments
114
BF BI MODE 1-ch w/o sup
1-ch w sup
2-ch w/o sup
2-ch w sup
1-ch w sup Binary input mode / supervision
BF
115 BF OP MODE non existent
external
BZ unbalance
trip rep/unbal
I>query
trip rep/I>quer
BZ unbalance Operation mode BF
121 T-BF-mP 0.05 .. 10.00 s 0.25 s Time delay for BF with multi-pole
faults
124 T-BF CB fault 0.00 .. 10.00 s 0.10 s Time delay BF after CB fault
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