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4.11
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
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 % 3rd harmonic
- up to 10 % 5th harmonic
1)
A further delay for the current may be caused by compensation in the secondary CT circuit.
SIPROTEC, 7SC80, Manual
E50417-G1140-C486-A1, Release date 12.2011
for I
= 1 A 0.05 A to 20.00 A
Nom
for I
= 5 A 0.25 A to 100.00 A
Nom
for I
= 1 A 0.05 A to 20.00 A
Nom
for I
= 5 A 0.25 A to 100.00 A
Nom
/V
PS
≤ 131.00 °F (55 °C)
amb
≤ 1.05
Nom
4.11 Breaker Failure Protection 50BF
0.06 s to 60.00 s or ∞
is included in the delay time
is included in the delay time
1)
approx. 25 ms
= 0.95 (minimum hysteresis between pickup
and tripping ≥ 32.5 mA)
3 % of setting value
or 15 mA for I
Nom
or 75 mA for I
Nom
1 % or 20 ms
≤ 1.15 1 %
PSNom
0.5 %/10 K
1 %
1 %
1 %
Technical Data
Increments 0.01 A
Increments 0.01 A
Increments 0.01 s
= 1 A
= 5 A
259
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