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Siemens AG ⋅ May 1998
6.5.6.2 Circuit-breaker failure protection
a) Operation mode of the CBF (DA 6201/ZE)
Setting options: 1-channel with/without
supervision
2-channel with/without
supervision
Recommended setting: "1- or 2-channel with
supervision" during
operation
"1- or 2-channel without
supervision" during
test
b) CBF-variant bay-selective (DA 66XX/ZE)
Setting options: - BZ unbalance
- trip by external CBF
- TRIP repeat/
unbalance
- TRIP repeat/
unbalance-pulse
- TRIP repeat/
I > sensor
- I > sensor
Recommended setting: depends on CBF
initialization
c) Stabilizing factor for the pick-up characteristic in
the "unbalance"mode of operation "TRIP rep/unĆ
bal" and "TRIP/UNB pulse"(DA 6202/ZE)
Range: 0 to 0.8
Recommended setting: refer chapter 6.5.6.1
d) Diff-current limit for the pick-up characteristic in
the "unbalance" mode of operation "TRIP-rep/unĆ
bal" and "TRIP/UNB pulse"(DA 6203/ZE)
Range: 0.2 to 4.0 I/I
N
Recommended setting: 0.5 I/I
N
e) Time delay for the breaker failure protection proĆ
cessing (DA 6204/ZE)
Range: 0.05 to 1 s
Recommended setting: 2 x circuit-breaker trip
time
f) Current limit for determining circuit-breaker failure
in the event of busbar short-circuit and for trip sigĆ
nal reset bay-selective (DA 67XX/ZE)
Range: 0.02 to 2.0 I
N
Recommended setting: depends on the lowest
short-circuit current that
can be expected.
g) Time delay for trip repetition
(DA 6208/ZE)
Range: 0 to 1 s
Recommended setting: 0.12 s
6.5.6.3 Supervisory functions
a) Isolator running time(DA 6301/ZE)
Range: 1 to 180 s
Recommended setting: depends on isolator
b) Isolator mal-function response(DA 6302/ZE)
Setting possibilities: - alarm only
- blocking w. autom.
release
- blocking with
storage
Recommended setting: alarm only
c) Cyclic test (DA 6311/ZE)
Setting possibilities: active/inactive
Recommended setting: active
d) Differential current supervision (DA 6303/ZE)
Setting possibilities: active/inactive
Recommended setting: active during normal
operation; inactive during
testing and commission-
ing
e) Zero crossing supervision (DA 6309/ZE)
Setting possibilities: active/inactive
Recommended setting: active when using
linearized CTs
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