Siemens 7SR12 Argus - Figure 3-15 Logic Diagram: 7 SR12 SEF Time Delayed Element (51 SEF)

7SR11 & 7SR12 Description Of Operation
Chapter 1 Page 46 of 88 ©2017 Siemens Protection Devices Limited
General Pickup
51SEF-n
51SEF-n Setting
51SEF-n Charact
51SEF-n Time Mult
51SEF-n Delay (DTL)
51SEF-n Follower DTL
51SEF-n Reset
51SEF-n Min Operate Time
c
Pickup
trip
Forward
Reverse
51SEF-n Dir.
Control
Non-Dir
≥1
&
&
51SEF-n Dir En
67SEF Fwd
67SEF Rev
51SEF-n VTS Action
Off
Non-Dir
Inhibit
VT Fail
& &
&
≥1
I
4
(I
SEF
)
Inhibit 51SEF-n
&
51SEF-n Element
Enabled
Disabled
51SEF-n Dir En
&
79 P/F Inst Trips
= 51SEF-n
79 P/F Prot’n Trip n
= Delayed
AUTORECLOSE
Ires Select
Ires Real
Ires
3I
0
cos(θ-θ
c
)
Wattmetric Block
>
Compensated
angle
Wattmetric
Inhibit Wattmetric
V
0
I
4
(I
SEF
)
3I
0
cos(θ-θ
c
)
67SEF Charact.angle
Wattmetric Block
67SEF Wattmetric Power
Figure 3-15 Logic Diagram: 7SR12 SEF Time Delayed Element (51SEF)