Specifications

7SR242 Duobias Performance Specification
©2010 Siemens Protection Devices Limited Chapter 3 - Page 42 of 45
Section 3: Supervision Functions
3.1 50BF Circuit Breaker Fail
3.1.1 Reference
Parameter Value
Is
Setting: 50BF-n 0.050, 0.055… 2.0 xIn
Is
Setting: 50BF-n-I4 0.005, 0.010… 2.0 xIn
t
CBF1
Stage 1 Delay setting 0, 5… 60000ms
t
CBF2
Stage 2 Delay setting 0, 5… 60000ms
3.1.2 Operate and Reset Level
Attribute Value
I
op
Operate level
100 % Is, r 5 % or r 1% In
I
reset
Reset level
100 % I
op
, r 5 % or r 1% In
Repeatability
r 1 %
-10 °C to +55 °C
d 5 %
Variation
f
nom
- 3 Hz to f
nom
+ 2 Hz
d 5 %
3.1.3 Operate and Reset Time
Attribute Value
t
basic
Element basic operate time < 20ms
Stage 1
t
CBF1
, r 1 % or r 20ms
t
op
Stage 2
t
CBF2
, r 1 % or r 20ms
Repeatability
r 1 % or r 20ms
Overshoot < 2 x 20ms
Disengaging time < 20ms