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Technical data
3
3 - 6
Siemens AG ⋅ May 1998
3.5 Circuit-breaker failure protection
Table 3.6 Circuit-breaker failure protection
one or two-channel initiation
(with external initiation)
Current sensor, TRIP repeat (1/3-phase) with
current sensor, forced unbalance (1-step),
with TRIP repeat, forced unbalance
(1/3-phase; (2-step), TRIP repeat and unbaĆ
lance with pulse trigger
TRIP by external CBF protection (tripping via
isolator mimic of busbar protection
Overcurrent /
N
2)
Stabilizing factor K
Time delay for unbalance/current sensor
Time delay for trip signal repeat
0,2 to 2,00 (in steps of 0,01)
0 to 0,8 (in steps of 0,01)
0,05 to 1,00 s (in steps of 0,01)
0 to 1,00 s (in steps of 0,01)
!
(for busbar short-circuit)
Overcurrent I/I
N
2)
Time delay
0,2 to 2,00 (0,01)
0,05 to 1 s (0,01)
3.6 General data
Table 3.7 General data
!
Trip signal storage time
Minimum current limit for reset of signal /
n
2)
0,02 to 1,0 s (in steps of 0,01)
0,2 to 2,0 (in steps of 0,1)
Setting range /
n
0 to 25 (in steps of 0,01)
Setting range in s 1 to 180 (in steps of 0,01)
Busbar arrangement (max.)
Number of bays
Quadruple or triple busbar with
transfer busbar; up to 4 couplers
and 24 sectionalizers, 12 bus secĆ
tions, 12 coupler bus sections.
3)
48 (including bus couplers and secĆ
tionalizers)
1) selectable feeder-selective
2) Nominal current of the feeder current transformer (1 or 5 A)
3) Sections which serve exclusively for coupling of bus sections; no feeder bays
Note:
1 longitudinal isolator (LT) (without current transformer)=1bay
1 sectionalizer or bus coupler = 2 bays
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