Siemens siprotec 7SA6 User Manual

Functions
6-897SA6 Manual
C53000-G1176-C133-1
Figure 6-53 Unblock–logic
6.4.1.7 Blocking scheme
Principle The blocking scheme uses the transmission channel to send a block signal from one
line end to the other. The signal is sent as soon as the protection function has detected
a fault in reverse direction, optionally also directly after fault inception (jump detector
via the dashed line in Figure 6-54). It is stopped, as soon as the distance protection
detects a fault in the forward direction, alternatively the signal is only sent when the
distance protection detects the fault in the reverse direction. The signal will be
maintained if the fault is in reverse direction. If the signal is sent with jump detection
(i.e.  'LV-XPS%ORFNLQJ routed in parallel with  - ) only a short delay
to allow for signal transmission is required before Z1b trips. A trip can be achieved with
>Dis.T.UB 1-L1
>Dis.T.UB bl 1
&
&
&
020
ms
100100
ms
≥1
Unblock L1
010
s
to receive circuit Figure 6-52to receive circuit Figure 6-52
>Dis.T.UB 1-L2
&
&
&
020
ms
100100
ms
≥1
Unblock L2
010
s
>Dis.T.UB ub 1
&
&
&
020
ms
100100
ms
≥1
Unblock 1
010
s
Dis.T.UB Fail1
>Dis.T.UB 1-L3
&
&
&
020
ms
100100
ms
≥1
Unblock L3
010
s
≥1
>Dis.T.UB bl 2
>Dis.T.UB ub 2
&
&
&
020
ms
100100
ms
≥1
Unblock 2
010
s
Dis.T.UB Fail1
≥1
FNr 4032
FNr 4033
FNr 4034
FNr 4030
FNr 4031
FNr 4035
FNr 4032
FNr 4080
FNr 4081

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English