Functions
6-148
7SA6 Manual
C53000-G1176-C156-2
Figure 6-84
Logic diagram of the blocking scheme (one line end)
6.8.1.4
Transient Blocking
Transient blocking provides additional security against erroneous signals due to tran-
sients caused by clearance of an external fault or by fault direction reversal during
clearance of a fault on a parallel line.
The principle of transient blocking scheme is that following the incidence of an external
fault, the formation of a release signal is prevented for a certain (settable) time. In the
case of permissive schemes, this is achieved by blocking of the transmit and receive
circuit.
Figure 6-85 shows the principle of the transient blocking for a directional comparison
and directional unblocking scheme.
If a fault in the reverse direction is detected within the waiting time
TrBlk Wait Time
(address
3209A
) following fault detection, the transmit circuit and the trip release are
inhibited. This blocking is maintained for the duration of the transient blocking time
TrBlk BlockTime
(address
3210A
) also after the reset of the blocking criterion.
In the case of the blocking scheme, the transient blocking prolongs the received block-
ing signal as shown in the logic diagram Figure 6-84.
3IoMin Teleprot
3203
Send Prolong.
&
T
0
≥
1
I
L1
,
I
L2
,
I
L3
d
dt
40 ms
(u,i)
(A)
U
L1
, U
L2
, U
L3
EF forward
&
&
EF Pickup
3208
Release Delay
0
T
Line Config.
3202
Two terminals
Three terminals
EF Enable Trip
3209
TrBlk Wait Time
T
T
3210
TrBlk BlockTime
&
≥
1
&
&
&
EF Telep. off
1313 >EF TeleprotBLK
EF TeleTransBlk
1318 >EF Rec.Ch1
1319 >EF Rec.Ch2
EF Telep. OFF
1381
EF Tele SEND
1384
EF Tele BL STOP
1384
EF TeleTransBlk
1386
EF Tele BL Jump
1390
Содержание siprotec 7SA6
Страница 2: ...Siemens Aktiengesellschaft Book No C53000 G1176 C156 2 ...
Страница 18: ...xviii 7SA6 Manual C53000 G1176 C156 2 ...
Страница 32: ...Introduction 1 14 7SA6 Manual C53000 G1176 C156 2 ...
Страница 82: ...Hardware and Connections 2 50 7SA6 Manual C53000 G1176 C156 2 ...
Страница 119: ...SIPROTEC 4 Devices 4 25 7SA6 Manual C53000 G1176 C156 2 Figure 4 20 CFC Logic example ...
Страница 190: ...Configuration 5 62 7SA6 Manual C53000 G1176 C156 2 ...
Страница 559: ...Control During Operation 7 45 7SA6 Manual C53000 G1176 C156 2 Figure 7 45 Circuit breaker trip test in DIGSI 4 ...
Страница 652: ...Installation and Commissioning 8 78 7SA6 Manual C53000 G1176 C156 2 ...
Страница 724: ...Technical Data 10 56 7SA6 Manual C53000 G1176 C156 ...
Страница 800: ...Appendix A 76 7SA6 Manual C53000 G1176 C156 2 ...
Страница 866: ...Appendix B 66 7SA6 Manual C53000 G1176 C156 2 ...