Siemens siprotec 7SA522 - Fault Location

Technical Data
10-26 7SA522 Manual
C53000-G1176-C119-2
10.14 Fault Location
Start with trip command or drop-off
Setting range reactance (secondary) 0.005 Ω/km to 6.500 Ω/km
*)
(steps 0.001 Ω/km) or
0.005 Ω/mile to 10.000 Ω/mile
*)
(steps 0.001 Ω/mile)
Parallel line compensation may be switched on/off
Set values are the same as for distance
protection (see Section 10.2)
Output of the fault distance in Ω primary and Ω secondary,
in km or miles line
1
),
in % of the line length
1
)
Measuring tolerances 2.5 % of line length
with sinusoidal measured quantities at 30° ≤ ϕ
k
≤ 90° and U
k
/U
N
≥ 0.1
1
) Output of the fault distance in km, miles, and % requires homogeneous lines.
*) Secondary values based on I
N
= 1 A; for I
N
= 5 A the values are to be divided by 5.
10.15 Circuit Breaker Failure Protection
Circuit Breaker
Monitoring
Current flow monitoring 0.05 A to 20.00 A
1
)
(steps 0.01 A)
Drop-off to pick-up ratio approx. 0.95
Tolerance 5 % of the set value or 0.01 A
1
)
Monitoring of circuit-breaker
auxiliary contact position
- for three-pole tripping binary input for breaker auxiliary contact
- for single-pole tripping 1 binary input per circuit breaker pole
or
1 binary input for cb-position three-pole
closed and 1 binary input for cb-position
three-pole open
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
N
= 1 A; for I
N
= 5 A the values are to be multiplied by 5.
Initiation
Conditions
For circuit breaker failure protection single-pole tripping internal
three-pole tripping internal
single-pole tripping external
1
)
three-pole tripping external
1
)
three-pole tripping without current
1
)
1
) via binary inputs
Times Pick-up time approx. 5 ms with measured quantities
present prior to start,