Siemens Argus 7SR22 - Current Protection: Arc Flash Detector (50 AFD); Figure 3.12-1 Logic Diagram: Arc Flash Detector (50 AFD)

7SR210 & 7SR220 Description of Operation
Unrestricted ©2018 Siemens Protection Devices Limited Page 49 of 94
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.
&
Enabled
Disabled
50AFD
Setting
c
I
A
I
B
I
C
&
50AFD
Arc Detector
Binary Input
AFD Zone 1AFD Zone 1 Flash
AFD Zone 6 Flash AFD Zone 6
AFD Zone 1 Flash
AFD Zone 6 Flash
50 AFD
50 AFD PhA
50 AFD PhB
50 AFD PhC
Figure 3.12-1 Logic Diagram: Arc Flash Detector (50 AFD)