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4.6
Circuit Breaker Failure Protection (optional)
Circuit breaker monitoring
Current flow monitoring
Zero sequence current monitoring
Dropout to pickup ratio
Tolerance
Monitoring of circuit breaker auxiliary contact position
- for three-pole tripping
- for single-pole tripping
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 end fault protection and circuit breaker pole discrepancy supervision.
Initiation conditions
For circuit breaker failure protection
1)
via binary inputs
Times
Pickup time
Dropout time, internal (overshoot time)
Delay times for all stages
Tolerance
End fault protection
With signal transmission to the opposite line end
Time delay
Tolerance
Pole discrepancy supervision
Initiation criterion
Monitoring time
Tolerance
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
for I
= 1 A 0.05 A to 20.00 A
N
for I
= 5 A 0.25 A to 100.00 A
N
for I
= 1 A 0.05 A to 20.00 A
N
for I
= 5 A 0.25 A to 100.00 A
N
Approx. 0.95
5 % of setting value or 1 % of nominal current
Binary input for circuit breaker auxiliary contact
1 binary input for auxiliary contact per pole or
1 binary input for series connection NO contact and NC contact
Three-pole tripping internal (by voltage protection)
Single-pole tripping external
Three-pole tripping external
Three-pole tripping 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
4.6 Circuit Breaker Failure Protection (optional)
Increments 0.01 A
Increments 0.01 A
1)
1)
1)
Increments 0.01 s
Increments 0.01 s
Increments 0.01 s
Technical Data
253
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