Operating instructions7SV512
V1
77C53000---G1176---C91
1 2 0 0 B R E A K E R
F A I L U R E P R O T .
Beginning of the block ”Circuit breaker failure protec-
tion”
1 2 0 1 B R E A K F A I L
O N
O F F
Circuit breaker failure protection is
ON switched on
OFF switched off
Pick-up value of the current detector of the breaker
failure protection
Smallest setting value: 0.05 I
N
Largest setting value: 4.00 I
N
1 2 0 2 I - B F
0 . 1 0 I / I n
1 2 0 3 T R I P C R o f f
N O
Y E S
Trip signal repetition to the local feeder circuit breaker
(cross trip) is switched off
NO after T1 (two-stage breaker failure protection)
cross trip will be initiated
YES cross trip is switched off (single-stage breaker
failure protection)
1 2 0 4 T R I P 1 P O L E
Y E S
N O
Single-pole trip signal repetition to the local feeder
breaker after single-pole trip of the feeder protection
YES is permitted provided the feeder protection has
issued a single-pole trip signal
NO is not permitted: always three-pole trip by the
breaker failure protection
Delay time for trip signal repetition to the local feeder
breaker after single-pole trip command of the feeder
protection
Smallest setting value: 0.00 s
Largest setting value: 32.00 s
or 1, i.e. no trip in this case
1 2 0 5 T 1 - 1 P O L E
0 . 0 0 s
Delay time for trip signal repetition to the local feeder
breaker after three-pole trip command of the feeder
protection
Smallest setting value: 0.00 s
Largest setting value: 32.00 s
or 1, i.e. no trip in this case
1 2 0 6 T 1 - 3 P O L E
0 . 0 0 s
1 2 1 1 T - T R I P - B B
T 1 + T 2
T 2
The total delay time of the trip signal to the adjacent
circuit breakers (bus-bar zone and remote end if appli-
cable)
T1+T2 is composed of T1 (address 1205 or 1206)
and T2 (address 1212 or 1213); i.e. T2 is
started after expiry of T1
T2 is equal T2 (address 1212 or 1213); i.e. T2
is started with trip command of the feeder
protection
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