Breaker Failure Protection (50Bf) - Siemens SIPROTEC 7SJ62 Instruction Manual

10.14 Breaker Failure Protection (50BF)

Pickup and Time
Delay Ranges/
Resolutions
Initiating Time
Tolerances
Influencing Vari-
ables
7SJ62 Manual
C53000-G1140-C121-1
Pickup of 50 Element BkrClosed I MIN
Time Delay
Pickup Times (protection initiates)
- For Internal Start
- Using Controls
- For External Start
Reset Time
Pickup Current
Time Delay
Power supply DC voltage (V
0.8 ≤ V ≤ 1.15
/ V
PS PS nominal
Temperature in range
23º F ≤ ϑ ≤ 131º F
amb
Frequency in range
0.95 ≤ f/f ≤ 1.05
N
Harmonics
rd
- Up to 10% 3 harmonic
th
- Up to 10% 5 harmonic
1
) For I = 1A, divide all limits by 5.
N
0.20 A to 5.00 A
TRIP-Timer 0.06 s to 60.00 s
or ∞ (no trip)
included in time delay
included in time delay
included in time delay
approx. 25 ms
BkrClosed I MIN3% of set value, or 50 mA
TRIP-Timer 1% or 20 ms
) in range
DC
1%
0.3 % /10º F
1%
1%
1%
Technical Data
1 1
) (Increments 0.05 A) )
(Increments 0.01 s)
1
)
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