7SR11 & 7SR12 Performance Specification
©2017 Siemens Protection Devices Limited Chapter 3 Page 44 of 56
2.17 50AFD ARC Flash Detector
(Refer to 7XG31 Technical Manual for performance characteristics)
2.17.1 Reference
Parameter Value
50 AFD
Setting 1, 2,...10 xIn
2.17.2 Operate and Reset Level
Attribute Value
I
op
Operate level (no DC transient)
100 % Is, ± 10 %
Transient overreach
(X/R ≤ 100)
≤ -30%
Reset level
≥ 95 % I
op
Repeatability
± 5 %
Variation
-10 °C to +55 °C
≤ 5 %
f
nom
- 3 Hz to f
nom
+ 2 Hz
≤ 5 %
2.17.3 Operate and Reset Time
Attribute Value
t
basic
50AFD Overcurrent operate time 10 ms – 16 ms
t
op
AFD Zone Operate time (Flash & 50AFD) 15 ms – 25 ms
Repeatability
± 10 ms
Disengaging time < 50 ms
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