Circuit-Breaker Failure Protection (Optional) - Siemens SIPROTEC 7SD80 Manual

Technical Data

4.9 Circuit-Breaker Failure Protection (Optional)

4.9 Circuit-Breaker Failure Protection (Optional)
Circuit Breaker Supervision
Current-flow Monitoring
Zero sequence current monitoring
Dropout ratio
Tolerance
Monitoring of circuit breaker auxiliary contact position
for three-pole tripping
Note:
The circuit breaker failure protection can also operate without the indicated circuit breaker auxiliary contacts, but the func-
tion 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 stub fault protection and circuit breaker pole discrepancy supervision.
Initiation Conditions
For circuit breaker failure protection
1)
Via binary inputs
Times
Pickup time
Drop-off time, internal (overshoot time)
Time delays for all elements
Tolerance
End Fault Protection
With signal transmission to the opposite line end
Time delay
Tolerance
Pole Discrepancy Supervision
Initiation criterion
Monitoring time
Tolerance
310
for I = 1 A 0.05 A to 20.00 A
Nom
for I = 5 A 0.25 A to 100.00 A
Nom
for I = 1 A 0.05 A to 20.00 A
Nom
for I = 5 A 0.25 A to 100.00 A
Nom
approx. 0.95
5 % of setting value or 1 % of nominal current
binary input for CB auxiliary contact
Internal or external 1-pole trip
Internal or external 3-pole trip
Internal or external 3-pole trip without current
Approx. 5 ms with measured quantities present
Approx. 20 ms after switch-on of measured quantities
≤ 15 ms at sinusoidal measured values,
≤ 25 ms maximal
0.00 s to 30.00 s; ∞
1 % of setting value or 10 ms
0.00 s to 30.00 s; ∞
1 % of setting value or 10 ms
Not all poles are closed or open
0.00 s to 30.00 s; ∞
1 % of setting value or 10 ms
Increments 0.01 A
Increments 0.01 A
1)
1)
1)
Increments 0.01 s
Increments 0.01 s
Increments 0.01 s
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011