Circuit Breaker Failure Protection - Siemens SIPROTEC 7UT613 series Manual

4 Technical Data
4.17

Circuit Breaker Failure Protection

Circuit Breaker Supervision
Starting Conditions
Times
478
Current flow monitoring
Dropout-to-pickup ratio
Tolerance
Breaker status monitoring
Secondary values based on I
1)
For breaker failure protection
Pickup time for f = 50 / 60 Hz
N
Pickup time for f = 16.7 Hz
N
Dropout time for f = 50/60 Hz
N
Dropout time for f = 16.7 Hz
N
Times
Time tolerance
0.04 A to 1.00 A
for the respective side
approx. 0.9 for I ≥ 0.25 A
5 % of set value or 0.01 A
via circuit breaker auxiliary contacts and
binary input
= 1 A; for I
= 5 A the currents must be multiplied by 5.
N N
internal trip
external trip (via binary input)
approx. 3 ms with measured quantities,
approx. 20 ms after switch-on of measured
quantities
approx. 60 ms after switch-on of measured
quantities
approx. 25 ms
approx. 75 ms
0.00 s to 60.00 s; ∞
1 % of set value or 10 ms
1)
Steps 0.01 A
1)
1)
Steps 0.01
7UT613/63x Manual
C53000-G1176-C160-2