Breaker Failure Protection (Ansi 50Bf) - Siemens Siprotec 7UM611 Manual

4.21

Breaker Failure Protection (ANSI 50BF)

Setting Ranges / Increments
Times
Tolerances
Influencing Variables for Pickup Values
7UM61 Manual
C53000-G1176-C127-3
Pickup thresholds BF I>
Delay Time BF-T
Pickup Times
– On Internal Start
– Using Controls
– For external Start
Dropout Time
Pickup Threshold BF I>
Delay Time BF-T
Power Supply DC Voltage in Range
0,8 ≤ U ≤ 1.15
/U
PS PSN
Temperature in Range
–5 °C ≤ Θ ≤ 55 °C
amb
Frequency in Range
0,95 ≤ f/f ≤ 1.05
N
Harmonics
– Up to 10 % 3rd harmonic
– Up to 10 % 5th harmonic
4.21 Breaker Failure Protection (ANSI 50BF)
for I = 1 A 0.04 A to 2.00 A
N
for I = 5 A 0.20 A to 10.00 A
N
0.06 s to 60.00 s or
∞
approx. 50 ms
approx. 50 ms
approx. 50 ms
approx. 50 ms
for I = 1 A 1 % of setting value or 10 mA
N
for I = 5 A 1 % of setting value or 50 mA
N
1 % or 10 ms
≤ 1 %
≤ 0.5 % / 10 K
≤ 1 %
≤ 1 %
≤ 1 %
Increments
0.01 A
Increments
0.05 A
Increments 0.01
s
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