Figure 1-36 Logic Diagram: 7Sr12 Sef Instantaneous Element - Siemens 7SR11 Manual

67SEF Fwd
67SEF Rev
AUTORECLOSE
= 50SEF-n
&
= Delayed
50SEF-n Dir En
Wattmetric Block
I (I
4 SEF
3I cos(θ-θ
0

Figure 1-36 Logic Diagram: 7SR12 SEF Instantaneous Element

©2012 Siemens Protection Devices Limited
VT Fail
&
1
&
I (I )
4 SEF
V
0
&
c
)
)
c
7SR11 & 7SR12 Description Of Operation
& &
1
&
Wattmetric Block
3I cos(θ-θ )
0 c
Chapter 1 Page 39 of 76
50SEF-n Dir En