Siemens siprotec 7SA6 - Page 355

Functions
6-1657SA6 Manual
C53000-G1176-C156-2
Figure 6-92 Logic diagram of the I
p
–stage (inverse time overcurrent protection IDMT) — illustration for IEC–curves
≥1
2671
Yes
No
I(3I0)p SOTF
2670
Yes
No
further
stages
3I
0P
&
&
≥1
E
I
E
2652 T 3I0p Time Dial
T0
t
I
I
P
&
&
≥1
L1
2642 T Ip Time Dial
2646
T Ip Add.
T0
2660 IEC Curve
t
I
I
L3
I
L2
I
L1
L2
L3
2640
IP
2656
T 3I0p Add.
2650 3I0p PICKUP
switch onto
fault
T0
2680
SOTF Time DELAY
I(3I0)p Tele/BI
Ip Pickup L3
Ip Pickup L2
Ip Trip L3
Ip Trip L2
Ip Pickup L1
Ip Trip L1
3I0p Trip
3I0p Pickup
7106
>BLOCK O/C Ip
7110
>O/C InstTRIP