Siemens 7SR51 - 50 AFD Arc Flash Detection; 50 GAFD Earth Arc Flash Detection

50AFD Arc Flash Detection
Reference (50AFD)
Parameter Value
I
set
Setting 0.5 to 20 ⋅ I
rated
, Δ 0.05
I Applied current (for operate time) 0 to 2 ⋅ I
set
(switched)
Operate and Reset Level (50AFD)
Attribute Value
I
op
Operate level (no DC transient) I
set
: ± 10 %
Transient overreach (X/R ≤ 100) ≤ -30 %
Reset level ≥ 95 % I
op
Repeatability ± 5 %
Variation IEC
60255-1
-10 °C to +55 °C ≤ 5 %
f
rated
- 3 Hz to f
rated
+
2 Hz
≤ 5 %
Operate and Reset Time (50AFD)
Attribute Value
t
basic
Element basic operate time 2 ⋅ I
set
: < 20 ms
t
op
AFD zone operate time (Flash and 50AFD) 2 ⋅ I
set
: 15 ms - 25 ms
Repeatability ± 10 ms
Disengaging time < 50 ms
50GAFD Earth Arc Flash Detection
Reference (50GAFD)
Parameter
Value
I
set
Setting 0.5 to 8 ⋅ I
rated
, Δ 0.05
I Applied current (for operate time) 0 to 2 ⋅ I
set
(switched)
Operate and Reset Level (50GAFD)
Attribute
Value
I
op
Operate level (no DC transient) I
set
: ± 10 %
Transient overreach (X/R ≤ 100) ≤ -30 %
Reset level ≥ 95 % I
op
Repeatability ± 5 %
Variation IEC
60255-1
-10 °C to +55 °C ≤ 5 %
f
rated
- 3 Hz to f
rated
+
2 Hz
≤ 5 %
10.13
10.13.1
Technical Data
10.13 50AFD Arc Flash Detection
520 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019