4.21 Breaker Failure Protection (ANSI 50BF)
335
7UM61 Manual
C53000-G1176-C127-3
4.21 Breaker Failure Protection (ANSI 50BF)
Setting Ranges / Increments
Times
Tolerances
Influencing Variables for Pickup Values
Pickup thresholds BF I> for I
N
= 1 A 0.04 A to 2.00 A Increments
0.01 A
for I
N
= 5 A 0.20 A to 10.00 A Increments
0.05 A
Delay Time BF-T 0.06 s to 60.00 s or
∞
Increments 0.01
s
Pickup Times
– On Internal Start
– Using Controls
– For external Start
Dropout Time
approx. 50 ms
approx. 50 ms
approx. 50 ms
approx. 50 ms
Pickup Threshold BF I> for I
N
= 1 A 1 % of setting value or 10 mA
for I
N
= 5 A 1 % of setting value or 50 mA
Delay Time BF-T 1 % or 10 ms
Power Supply DC Voltage in Range
0,8 ≤ U
PS
/U
PSN
≤ 1.15
≤ 1 %
Temperature in Range
–5 °C ≤ Θ
amb
≤ 55 °C
≤ 0.5 % / 10 K
Frequency in Range
0,95 ≤ f/f
N
≤ 1.05
≤ 1 %
Harmonics
– Up to 10 % 3rd harmonic
– Up to 10 % 5th harmonic
≤ 1 %
≤ 1 %
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