Siemens SIPROTEC 4 7VK61, Manual

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Circuit breaker failure protection (optional)
Circuit breaker monitoring
Current flow monitoring for
Ι
N
= 1 A 0.05 A to 20.00 A Increments 0.01 A
for
Ι
N
= 5 A
0.25 A to 100.00 A
Zero sequence current monitoring for
Ι
N
= 1 A 0.05 A to 20.00 A Increments 0.01 A
for
Ι
N
= 5 A 0.25 A to 100.00 A
Dropout to pickup ratio Approx. 0.95
Tolerance 5 % of set value or 1 % of nominal current
Monitoring of circuit breaker auxiliary contact position
for 3-pole tripping
binary input for CB auxiliary contact
for 1-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) and for stub fault protection and circuit breaker pole discrepancy supervision.
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
Dropout time, internal (overshoot time) ≤ 15 ms at sinusoidal measured values,
≤ 25 ms maximum
Delay times for all stages 0.00 s to 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
4.6
Technical Data
4.6 Circuit breaker failure protection (optional)
SIPROTEC 4, 7VK61, Manual 247
C53000-G1176-C159-5, Edition 05.2018