Current Protection: Arc Flash Detector (50 Afd); Figure 3.12-1 Logic Diagram: Arc Flash Detector (50 Afd) - Siemens Argus 7SR21 Technical Manual

3.12 Current Protection: Arc Flash Detector (50 AFD)

By employing an optical detection technique, Arc Fault Protection results in fast clearance of arcing faults.
Arc fault protection is achieved in the relays via the 7XG31xx series of equipment being connected to the binary
inputs.
Should the sensor operate when the current is above the 50AFD Setting then an output signal will be initiated.
Refer to 7XG31 documentation for further details.
Disabled
Enabled
AFD Zone 1 Flash
Arc Detector
Binary Input
AFD Zone 6 Flash
Setting
c
I
A
I
B
I
C
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50AFD
50AFD

Figure 3.12-1 Logic Diagram: Arc Flash Detector (50 AFD)

7SR210 & 7SR220 Description of Operation
& AFD Zone 1
AFD Zone 1 Flash
& AFD Zone 6
AFD Zone 6 Flash
50 AFD
50 AFD PhA
50 AFD PhB
50 AFD PhC
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