Breaker Failure Protection 50Bf - Siemens 7SC80 Manual

4.19

Breaker Failure Protection 50BF

Setting Ranges/Increments
Pickup threshold 50BF Pickup
Pickup threshold 50NBF Pickup
Time delay 50 BF TRIP Timer
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 50BF Pickup, 50NBF Pickup
Time delay 50 BF TRIP Timer
Influencing Variables for Pickup Values
Auxiliary direct voltage in the range of 0.8 ≤ V
Temperature in the range of 23.00 °F (-5 °C) ≤ Θ
Frequency in the range of 0.95 ≤ f/f
Harmonics
- up to 10 % 3. harmonic
- up to 10 % 5. harmonic
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
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
0.06 s to 60.00 s or ∞
/V ≤ 1.15
PS PSNom
≤ 131.00 °F (55 °C)
amb
≤ 1.05 (f = 50 Hz or 60 Hz)
Nom Nom
4.19 Breaker Failure Protection 50BF
Increments 0.01 A
Increments 0.01 A
Increments 0.01 s
is included in the delay time
is included in the delay time
approx. 25 ms 1)
= 0.95(minimum hysteresis between pickup
and tripping ≥ 32.5 mA)
3 % of setting value,
or 15 mA for Ι = 1 A
Nom
or 75 mA for Ι = 5 A
Nom
1 % or 20 ms
1 %
0.5 %/10 K
1 %
1 %
1 %
Technical Data
557