4 Technical Data
476
7SA522 Manual
C53000-G1176-C155-3
4.18 Circuit Breaker Failure Protection (optional)
Circuit Breaker Monitoring
Initiation Conditions
Times
End Fault Protection
Pole Discrepancy Supervision
Current flow monitoring for I
N
= 1 A 0.05 A to 20.00 A Increments 0.01 A
for I
N
= 5 A 0.25 A to 100.00 A
Drop-off to pick-up ratio Approx. 0.95
Tolerance 5 % of setting value or 1 % of nominal current
Monitoring of circuit-breaker auxiliary contact position
- for three-pole tripping Binary input for circuit breaker auxiliary contact
- for single-pole tripping 1 binary input for auxiliary contact per pole or
1 binary input for series connection NO contact and NC contact
Note
:
The circuit breaker failure protection can also operate without the indicated circuit breaker auxiliary contacts, but the
function range is then reduced.
Auxiliary contacts are necessary for the circuit breaker failure protection for tripping without or with a very low current
flow (e.g. Buchholz protection, stub fault protection, circuit breaker pole discrepancy monitoring).
For circuit breaker failure protection Single-pole tripping internal
Three-pole tripping internal
Single-pole tripping external
1)
Three-pole tripping external
1)
Three-pole tripping without current
1)
1)
via binary inputs
Pickup time Approx. 5 ms with measured quantities present
Approx. 20 ms after switch-on of measured quantities
Drop-off time, internal (overshoot time) ≤ 15 ms at sinusoidal measured values,
≤ 25 ms maximal
Delay times for all stages 0.00 s to 30.00 s; ∞ Increments 0.01 s
Tolerance 1 % of setting value or 10 ms
With signal transmission to the opposite line end
Time delay 0.00 s to 30.00 s; ∞ Increments 0.01 s
Tolerance 1 % of setting value or 10 ms
Initiation criterion Not all poles are closed or open
Monitoring time 0.00 s to 30.00 s; ∞ Increments 0.01 s
Tolerance 1 % of setting value or 10 ms
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