Siemens siprotec 7SA522 User Manual page 275

„1"
>BLOCK Weak Inf
4203
!$$ VI9@SWPGU
U
L1
U
L1
CB closed L1
PICKUP L1
!$$ VI9@SWPGU
U
L2
U
L2
CB closed L2
PICKUP L2
!$$ VI9@SWPGU
U
L3
U
L3
CB closed L3
PICKUP L3
VT loss
*)
4207
>Dis.T.RecCh1L1
*)
4208
>Dis.T.RecCh1L2
≥1
*)
4209
>Dis.T.RecCh1L3
*)
4206 >Dis.Tel Rec.Ch1
Two terminals
„1"
*)
Three terminals
4210
>Dis.Tel Rec.Ch2
Dist. OFF/BLOCK
" $ "D‚HvÃUryrƒ…‚‡
I
E
3I
0
EF Pickup
*)
1318
>EF Rec.Ch1
Two terminals
„1"
Three terminals
1319
>EF Rec.Ch2
*)
EF OFF/BLOCK
Figure 6-75 Logic diagram of the weak infeed tripping
7SA522 Manual
C53000-G1176-C119-2
A8UÃXrhxÃDsrrq
!$
OFF
ECHO only
ECHO and TRIP
&
&
&
! ! GvrÃ8‚svtÃ
&
40 50
ms
with earth fault protection
≥1
"!! GvrÃ8‚svtÃ
&
40 50
ms
&
S Q
&
&
R
S Q
&
&
R
S Q
&
&
R
with dist.protection
*)
applies to PUTT and
POTT;
with unblock schemes,
the "unblock" signals
acc. to Fig. 6-51 apply
S Q
&
&
R
*)
applies to direc. comp;
with unblock schemes the
"unblock" signals apply
Functions
&
4232 W/I Pickup L1
≥1
&
4233 W/I Pickup L2
≥1
&
4234 W/I Pickup L3
≥1
6-127