Siemens SIPROTEC 4 7SJ61 - Breaker Failure Protection

Breaker Failure Protection
Setting Ranges / Increments
Pickup threshold 50-1 BF
for Ι
Nom
= 1 A
0.05 A to 20.00 A Increments 0.01 A
for Ι
Nom
= 5 A
0.25 A to 100.00 A Increments 0.01 A
Pickup threshold 50N-1 BF
for Ι
Nom
= 1 A
0.05 A to 20.00 A Increments 0.01 A
for Ι
Nom
= 5 A
0.25 A to 100.00 A Increments 0.01 A
Delay time 50 BF Trip timer 0.06 s to 60.00 s oder ∞ Increments 0.01 s
Delay time 50 BF-2 Delay 0.06 s to 60.00 s oder ∞ Increments 0.01 s
Times
Pickup Times
– On Internal Start
– For external Start
Dropout Time
included in time delay
included in time delay
approx. 25 ms
1)
Tolerances
Pickup thresholds 50-1 BF, 50N-1 BF 2 % of setting value
or 10 mA for Ι
Nom
= 1 A
or 50 mA for Ι
Nom
= 5 A
Time Delay TRIP-Timer 1 % bzw. 20 ms
Influencing Variables for Pickup Values
Power supply direct voltage in range 0.8 ≤ V
PS
/V
PSNom
≤ 1.15 1 %
Temperature in range 23.00 °F (-5 °C) ≤ Θamb ≤ 131.00 °F (55 °C) 0.5 %/10 K
Frequency in range 25 Hz to 70 Hz 1 %
Harmonics
- up to 10 % 3rd harmonic
- up to 10 % 5th harmonic
1 %
1 %
1)
A further delay for the current may be caused by compensation in the CT secondary circuit.
4.16
Technical Data
4.16 Breaker Failure Protection
326 SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016