Technical data
7SV512
V1
21
C53000---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 but with reduced scope of functions.
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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