Siemens 7SR224 - 50 BF Circuit Breaker Fail; Reference; Operate and Reset Level; Operate and Reset Time

7SR224 Argus Performance Specification
3.2 50BF Circuit Breaker Fail
3.2.1 Reference
Parameter Value
Is
Setting 0.005, 0.010… 2.0 xIn
t
CBF1
Stage 1 Delay setting 0, 2, 0.205… 60000ms
t
CBF2
Stage 2 Delay setting 0, 2, 0.205… 60000ms
3.2.2 Operate and Reset Level
Attribute Value
I
op
Operate level
100 % Is, ± 5 % or ± 1% In
I
reset
Reset level
<100 % I
op
, ± 5 % or ± 1% In
Repeatability
± 1 %
-10 °C to +55 °C
≤ 5 %
Variation
f
nom
- 3 Hz to f
nom
+ 2 Hz
≤ 5 %
3.2.3 Operate and Reset Time
Attribute Value
t
basic
Element basic operate time < 20ms
Stage 1
t
CBF1
, ± 1 % or ± 20ms
t
op
Stage 2
t
CBF2
, ± 1 % or ± 20ms
Repeatability
± 1 % or ± 20ms
Overshoot < 2 x 20ms
Disengaging time < 20ms
©2010 Siemens Protection Devices Limited Chapter 3 Page 42 of 49