Siemens SIPROTEC 4 7UT6 Series - Circuit Breaker Failure Protection

Circuit Breaker Failure Protection
Circuit Breaker Supervision
Current flow monitoring
0.04 A to 1.00 A
1)
for the respective side
Increments 0.01 A
Dropout-to-pickup ratio
approx. 0.9 für Ι ≥ 0.25 A
1)
Tolerance
5 % of setting value or 0.01 A
1)
Breaker status monitoring via circuit breaker auxiliary contacts and
binary input
1)
Secondary values based on Ι
N
= 1 A; for Ι
N
= 5 A the currents must be multiplied by 5.
Starting Conditions
For breaker failure protection internal trip
external trip (via binary input)
Times
Pickup time for f
N
= 50/60 Hz approx. 3 ms with measured quantities,
approx. 20 ms after switch-on of measured
quantities
Pickup time for f
N
= 16.7 Hz (nur
7UT613/63x)
approx. 60 ms after switch-on of measured
quantities
Dropout time for f
N
= 50/60 Hz approx. 25 ms
Dropout time for f
N
= 16.7 Hz
(nur 7UT613/63x)
approx. 75 ms
Delay times 0.00 s to 60.00 s; ∞ Increments 0.01
Time tolerance 1 % of setting value or 10 ms
4.17
Technical Data
4.17 Circuit Breaker Failure Protection
SIPROTEC 4, 7UT6x, Manual 453
C53000-G1176-C230-5, Edition 09.2016