Technical data7SV512
V1
21C53000---G1176---C91
3.2 Circuit breaker failure protection
Breaker supervision
Current detection
setting range 0.05 I
N
to 4.00 I
N
(steps 0.01 I
N
)
drop-off ratio approx. 0.9
tolerance 0.01 ¡ I
N
or 5 % of set value
Supervision via breaker auxiliary contacts
with three-pole control 1 input for breaker auxiliary contact
with single-pole control 1 input for each pole or
1 input for parallel connection and 1 input for
series connection of the breaker auxiliary contacts
Note:The breaker failure protection can operate even without the mentioned breaker auxiliary contacts butwith reduced scope offunctions.
The auxiliary contacts are necessary for
Breaker failure protection after a trip without or end fault protection,
with insufficient current flow (e.g. Buchholz protection), pole discrepancy supervision.
Initiation conditions
for breaker failure protection single-pole trip from feeder protection
three-pole trip from feeder protection
three-pole trip from bus-bar protection
three-pole trip from non-short-circuit protection
Times
pick-up time approx. 5 ms with measured quantities present
approx. 20 ms after switch-on of meas. quantities
drop-off time with sinusoidal measured quantities < 10 ms
drop-off time maximum < 20 ms
delay times for all time stages 0.00 s to 32.00 s (steps 0.01 ms) or 1
delay time tolerance 1 % of set value or 10 ms
The set times are pure delay times.
3.3 Circuit breaker pole discrepancy supervision
Start criterion any pole open and any pole closed
Supervision time 0.00 s to 32.00 s (steps 0.01 ms) or 1
delay time tolerance 1 % of set value or 10 ms
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