Breaker Failure Protection 50Bf - Siemens SIPROTEC 4 Manual

4.19

Breaker Failure Protection 50BF

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