Siemens siprotec 7SA522 - Page 283

Functions
6-1357SA522 Manual
C53000-G1176-C119-2
Figure 6-78 Logic diagram of the I
p
–stage (inverse time overcurrent protection IDMT) — illustration for IEC–curves
≥1

Yes
No
,,S627)

Yes
No
further
stages
3I
0P
&
&
≥1
E
I
E
2652
7,S7LPH'LDO
T0
t
I
I
P
&
&
≥1
L1
2642
7,S7LPH'LDO

7,S$GG
T0
2660
,(&&XUYH
t
I
I
L3
I
L2
I
L1
L2
L3

,3
2656
7,S$GG
 ,S3,&.83
switch onto
fault
T0

627)7LPH'(/$<
,,S7HOH%,
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