Technical Data
4.20 Breaker Failure Protection 50BF
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
520
4.20
Breaker Failure Protection 50BF
Setting Ranges / Increments
Times
Tolerances
Influencing Variables for Pickup Values
1)
A further delay for the current may be caused by compensation in the CT secondary circuit.
Pickup threshold 50-1 BF
for
I
Nom
= 1 A 0.05 A to 20.00 A
Increment 0.01 A
for
I
Nom
= 5 A 0.25 A to 100.00 A
Increment 0.01 A
Pickup threshold 50N-1 BF
for
I
Nom
= 1 A 0.05 A to 20.00 A
Increment 0.01 A
for
I
Nom
= 5 A 0.25 A to 100.00 A
Increment 0.01 A
Delay time 50 BF trip timer
0.06 s to 60.00 s or
∞
Increments 0.01 s
Pickup Times
– On Internal Start
– For external Start
Dropout Time
included in time delay
included in time delay
Approx. 25 ms
Pickup thresholds 50-1 BF, 50N-1 BF
2 % of setting value;
or 10 mA for
I
Nom
= 1 A
or 50 mA for
I
Nom
= 5 A
Time Delay TRIP-Timer
1 % or 20 ms
Power supply direct voltage in range 0.8
≤
V
PS
/V
PSNom
≤
1.15
1 %
Temperature in range 23.00 °F (-5 °C)
≤
Θ
amb
≤
131.00 °F (55 °C)
0.5 %/10 K
Frequency in range f
Nom
±
5 Hz
1 %
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1 %
1 %
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