Siemens 7SR12 Argus - Figure 3-23 Logic Diagram: 50 G Line Check Elements (50 G LC); Figure 3-24 Logic Diagram: 50 SEF Line Check Elements (50 SEF LC); Figure 3-25 Logic Diagram: 50 Line Check Elements (50 LC)

7SR11 & 7SR12 Description Of Operation
Chapter 1 Page 52 of 88 ©2017 Siemens Protection Devices Limited
50G LC-n
>
c
I
4
Inhibit 50G LC-n
&
50G LC-n Setting
Enabled
Disabled
50G LC-n Element
50G LC-n Delay
Close CB Pulse +
Reclaim Timer
period
Line Check
≥1
Figure 3-23 Logic Diagram: 50G Line Check Elements (50G LC)
50SEF LC
-
n
>
c
I
4
(SEF)
Inhibit 50
SEF
LC-
n
&
50
SEF LC
-n Setting
Enabled
Disabled
50
SEF LC-
n
Element
50SEF LC-n Delay
Close CB Pulse
+
Reclaim Timer
period
Line Check
≥
1
Figure 3-24 Logic Diagram: 50SEF Line Check Elements (50SEF LC)
≥1
50 LC
-n
50
LC-n Setting
c
>
c
50
LC-n Delay
>
c
>
c
IL1
IL
2
IL
3
50/
51
Measurement
L1 81
HBL2
Off
Inhibit
&
L2 81HBL2
L
3 81HBL2
&
&
50
-n Inrush
Action
Inhibit 50
LC-n
Enabled
Disabled
50
LC
-n
Element
Close CB Pulse
+
Reclaim Timer
period
Line Check
≥
1
&
Figure 3-25 Logic Diagram: 50 Line Check Elements (50LC)