Siemens siprotec 7SA522 - Page 234

Functions
6-86 7SA522 Manual
C53000-G1176-C119-2
Figure 6-50 Logic diagram of the unblock scheme with Z1B (one line end)
/LQH&RQILJ
Dis Z1B L1
&
Dis Z1B L2
&
Dis Z1B L3
&
Dis Z1B
&
Dis. forward

6HQG3URORQJ
T0
&
&
&
&
&
&
≥1
≥1
≥1
Three terminals
Two terminals
„1“
≥1
&
Trip command
&
&
&
&
T0
T0
T0
≥1
≥1
≥1
≥1
≥1
≥1
Dis. PICKUP
Unblock 1
Unblock 2
Unblock L1
Unblock L2
Unblock L3
T0
2108
79
from unblock logic Figure 6-51
from unblock logic Figure 6-51
&
≥1
&
Transient blocking
(section 6.4.1.6)
&
Two terminals
Three terminals
Dis Telep. off
4003 >Dis.Telep. Blk
Dis.Telep.OFF
4052
Dis.T.SEND L1
4057
Dis.T.SEND L2
4058
Dis.T.SEND L3
4059
Dis.T.SEND
4056
Echo function
section 6.4.1.7
Weak infeed trip
section 6.7
Dis Enable Z1B/T1B L1
Dis Enable Z1B/T1B L2
Dis Enable Z1B/T1B L3