Siemens siprotec 7SA522 User Manual page 234

Functions
6-86
Dis Telep. off
4003 >Dis.Telep. Blk
Transient blocking
(section 6.4.1.6)
Trip command
Dis. forward
&
Dis Z1B L1
&
Dis Z1B L2
&
Dis Z1B L3
&
Dis Z1B
Dis. PICKUP
! ! GvrÃ8‚svtÃ
Two terminals
„1"
Three terminals
Unblock 1
Two terminals
Unblock 2
Three terminals
≥1
Unblock L1
Unblock L2
Unblock L3
Figure 6-50 Logic diagram of the unblock scheme with Z1B (one line end)
≥1
&
! " TrqÃQ…‚y‚t
0 T
&
≥1
0 T
&
≥1
0 T
&
≥1
0 T
&
≥1
UÃW
2108
T 0
≥1
&
≥1
&
&
&
4052
Dis.Telep.OFF
&
Dis.T.SEND L1
4057
&
4058
Dis.T.SEND L2
&
4059
Dis.T.SEND L3
&
4056
Dis.T.SEND
Echo function
section 6.4.1.7
&
Weak infeed trip
section 6.7
≥1
Dis Enable Z1B/T1B L1
≥1
Dis Enable Z1B/T1B L2
≥1
Dis Enable Z1B/T1B L3
7SA522 Manual
C53000-G1176-C119-2