Siemens SIPROTEC 7SJ61 - Breaker Failure Protection 50 BF

Technical Data
4.16 Breaker Failure Protection 50BF
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
352
4.16 Breaker Failure Protection 50BF
Setting Ranges / Increments
Times
Tolerances
Influencing Variables for Pickup Values
1)
A further delay for the current may be caused by compensation in the CT secondary circuit.
Pickup threshold 50-1 BF for I
Nom
= 1 A 0.05 A to 20.00 A Increment 0.01 A
for I
Nom
= 5 A 0.25 A to 100.00 A Increment 0.01 A
Pickup threshold 50N-1 BF for I
Nom
= 1 A 0.05 A to 20.00 A Increment 0.01 A
for I
Nom
= 5 A 0.25 A to 100.00 A Increment 0.01 A
Delay time 50 BF trip timer 0.06 s to 60.00 s or ∞ Increments 0.01 s
Pickup Times
– On Internal Start
– For external Start
Dropout Time
included in time delay
included in time delay
Approx. 25 ms
1)
Pickup thresholds 50-1 BF, 50N-1 BF 2 % of setting value;
or 10 mA for I
Nom
= 1 A
or 50 mA for I
Nom
= 5 A
Time Delay TRIP-Timer 1 % or 20 ms
Power supply direct voltage in range 0.8 ≤ V
PS
/V
PSNom
≤ 1.15 1 %
Temperature in range 23.00 °F (-5 °C) ≤ Θ
amb
≤ 131.00 °F (55 °C) 0.5 %/10 K
Frequency in range f
Nom
± 5 Hz 1 %
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1%
1%