Breaker Failure Protection 50BF
Setting Ranges / Increments
Pickup threshold 50-1 BF
for Ι
Nom
= 1 A
0.05 A to 20.00 A Increments 0.01 A
for Ι
Nom
= 5 A
0.25 A to 100.00 A Increments 0.01 A
Pickup threshold 50N-1 BF
for Ι
Nom
= 1 A
0.05 A to 20.00 A Increments 0.01 A
for Ι
Nom
= 5 A
0.25 A to 100.00 A Increments 0.01 A
Delay time 50 BF Trip timer 0.06 s to 60.00 s or ∞ Increments 0.01 s
Delay time 50 BF-2 Delay 0.06 s to 60.00 s or ∞ Increments 0.01 s
Times
Pickup times
- for internal start
- for external start
Included in time delay
Included in time delay
Dropout time
approx. 25 ms
1)
Dropout ratio 0.95 (minimal hysteresis between pickup and tripping ≥ 32.5 mA)
1)
A further delay for the current may be caused by compensation in the secondary CT circuit.
Tolerances
Pickup threshold 50-1 BF, 50N-1 BF
for Ι
Nom
= 1 A
3 % of setting value or 15 mA
for Ι
Nom
= 5 A
3 % of setting value or 75 mA
Time delay 50 BF trip timer 1 % or 20 ms
Influencing Variables for Pickup Values
Auxiliary DC voltage in range 0.8 ≤ V
Aux
/V
AuxNom
≤ 1,15 1 %
Temperature in range –5 °C (23 °F) ≤ Θ
amb
≤ 55 °C (131 °F) 0.5 %/10 K
Frequency in the range of 25 Hz to 70 Hz
Frequency in the range of 0.95 ≤ f/f
Nom
≤ 1.05 (f
Nom
= 50 Hz or 60 Hz) 1 %
Frequency outside range 0.95 ≤ f/f
Nom
≤ 1.05 Increased tolerances
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1 %
1 %
4.19
Technical Data
4.19 Breaker Failure Protection 50BF
SIPROTEC 4, 7SJ80, Manual 405
E50417-G1140-C343-A8, Edition 12.2017
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