Siemens siprotec 7SA522, User Manual

Page: 275 / 628

Functions
6-127
7SA522 Manual
C53000-G1176-C119-2
Figure 6-75 Logic diagram of the weak infeed tripping
*)
*)
>Dis.T.RecCh1L1 4207
U
L1
Two terminals
Three terminals
/LQH&RQILJ
&
„1“
Two terminals
Three terminals
/LQH&RQILJ
„1“
≥
1
EF OFF/BLOCK
50 40
ms
&
S
R
Q
I
E
3I
0
,R0LQ7HOHSURW
EF Pickup
≥
1
&
)&7:HDN,QIHHG
ECHO only
OFF
ECHO and TRIP
„1“
U
L1
81'(592/7
VT loss
&
Dist. OFF/BLOCK
50 40
ms
&
S
R
Q
&
PICKUP L1
CB closed L1
&
≥
1
&
W/I Pickup L1
>BLOCK Weak Inf
&
U
L2
U
L2
81'(592/7
&
S
R
Q
&
PICKUP L2
CB closed L2
&
≥
1
&
U
L3
U
L3
81'(592/7
&
S
R
Q
&
PICKUP L3
CB closed L3
&
≥
1
&
with earth fault protection
with dist.protection
*)
*)
*)
*)
applies to PUTT and
POTT;
with unblock schemes,
the ”unblock” signals
acc. to Fig. 6-51 apply
*)
*)
*)
applies to direc. comp;
with unblock schemes the
“unblock” signals apply
4203
>Dis.T.RecCh1L2
4208
>Dis.T.RecCh1L3
4209
>Dis.Tel Rec.Ch1 4206
>Dis.Tel Rec.Ch2
4210
>EF Rec.Ch1
1318
>EF Rec.Ch2
1319
4232
W/I Pickup L2 4233
W/I Pickup L3 4234