Circuit-Breaker Failure Protection (Optional)
Circuit Breaker Supervision
Current-flow Monitoring
for Ι
Nom
= 1 A
0.05 A to 20.00 A Increments 0.01 A
for Ι
Nom
= 5 A
0.25 A to 100.00 A
Zero sequence current monitoring
for Ι
Nom
= 1 A
0.05 A to 20.00 A Increments 0.01 A
for Ι
Nom
= 5 A
0.25 A to 100.00 A
Dropout 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 CB auxiliary contact
Note::
e: 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) and for Time Overcurrent fault protection and circuit breaker pole discrepancy supervi-
sion.
Initiation Conditions
For circuit breaker failure protection
Internal or external 1-pole trip
1)
Internal or external 3-pole trip
1)
Internal or external 3-pole trip without current
1)
1)
Via binary inputs
Times
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 maximum
Time delays for all elements 0.00 s bis 30.00 s; ∞ Increments 0.01 s
Tolerance 1 % of setting value or 10 ms
End Fault Protection
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
Pole Discrepancy Supervision
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
4.9
Technical Data
4.9 Circuit-Breaker Failure Protection (Optional)
SIPROTEC 4, 7SD80, Manual 275
E50417-G1100-C474-A2, Edition 02.2018
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