Fault Location; Circuit Breaker Failure Protection - Siemens siprotec 7SA6 User Manual

10.15 Fault Location

10.16 Circuit Breaker Failure Protection

Circuit Breaker
Monitoring
7SA6 Manual
C53000-G1176-C133-1
Start
Setting range reactance (secondary)
Parallel line compensation
Load current compensation
for single-phase earth faults
Output of the fault distance
Measuring tolerances
with sinusoidal measured quantities
Further output options
(dependent on order variant)
output time, settable
1
) Output of the fault distance in km, miles, and % requires homogeneous lines.
2
) Secondary values based on I
Current flow monitoring
Drop-off to pick-up 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), stub fault protection, circuit breaker pole discrepancy monitoring.
1
) Secondary values based on I
multiplied by 5.
with trip command or drop-off
0.005 Ω/km to 6.500 Ω/km
0.005 Ω/mile to 10.000 Ω/mile
can be switched on/off
Set values are the same as for distance
protection (see Section 10.2)
correction of the X-value
can be switched on/off
in Ω primary and Ω secondary,
in km or miles line
in % of the line length
2.5 % of line length
at 30° ≤ ϕ
k
as analog value 0 mA to 22.5 mA;
as BCD–code 4 bit units + 4 bit tens +
1 bit hundreds + 1 validity bit
0.01 s to 30.00 s; ∞
= 1 A; for I = 5 A the impedances are to be divided by 5.
N N
0.05 A to 20.00 A
(steps 0.01 A)
approx. 0.95
5 % of the set value or 0.01 A
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
= 1 A; for I = 5 A the currrent values are to be
N N
Technical Data
2
)
(steps 0.001 Ω/km) or
2
)
(steps 0.001 Ω/mile)
1
),
1
)
≤ 90° and U ≥ 0.1
/U
k N
(steps 0.01 s)
1
)
1
)
10-33