50Bf Circuit-Breaker Failure Protection - 3 Pole - Siemens 7SR51 Device Manual

Technical Data
10.14 50BF Circuit-Breaker Failure Protection – 3 Pole
10.14 50BF Circuit-Breaker Failure Protection – 3 Pole
50BF Circuit‑Breaker Failure Protection – 3 Pole
10.14.1
Reference
I
set
t
delay1
t
delay2
Operate and Reset Level
I
op
I
reset
Operate and Reset Time
t
basic
t
op
Circuit‑Breaker Supervision
Position supervision via circuit‑breaker auxiliary contacts
For 3 pole CB tripping
NOTE
i
i
The circuit‑breaker failure protection can also work without the circuit‑breaker auxiliary contacts stated.
Auxiliary contacts are required for circuit‑breaker failure protection in cases where the current flow is
absent or too low for tripping (for example with a transformer or a Buchholz protection).
Times
Pickup time, in the case of an internal start
Pickup time, in the case of an external start
Dropout time for unbalancing operating mode
Typical dropout time
Dropout time via circuit‑breaker auxiliary contact
criterion
522
Parameter
Setting
Stage 1 delay setting
Stage 2 delay setting
Attribute
Operate level
Reset level
Repeatability
Variation IEC -10 °C to +55 °C
60255-1
f
rated
Attribute
Element basic operate time
Stage 1
Stage 2
Repeatability
Overshoot
Disengaging time
Value
0.050 to 2 ⋅ I
20 to 60000 ms
20 to 60000 ms
Value
I , ± 5 % or ± 1 % I
set
< 100 % I
op
± 1 %
≤ 5 %
± 5 % ≤ 5 %
1 input each for make contact and break contact
< 1 ms
< 5 ms
Approx. 2 ms
< 15 ms
< 5 ms
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
rated
rated
± 5 % or ± 1 % I
rated
Value
< 20 ms
t , ± 1 % or ± 20 ms
delay1
t , ± 1 % or ± 20 ms
delay2
± 1 % or ± 20 ms
< 2 ⋅ 20 ms
< 30 ms