Siemens siprotec 7SA522 User Manual

Functions
6-92 7SA522 Manual
C53000-G1176-C119-2
The echo impulse is then issued (event output “(&+26,*1$/”). It’s length is set with
the parameter 7ULS(;7(16,21.
After issue of the echo impulse, the transmission of a new echo is prevented for at
least 20 ms. This prevents the repetition of an echo after the line has been switched
off.
In the case of the blocking scheme and the underreach transfer trip scheme, the echo
function is not required and therefore ineffective.
Figure 6-55 Logic diagram of the echo function with distance protection teleprotection
6.4.2 Applying the Function Parameter Settings
General The distance protection teleprotection supplement is only in service if it is set during
the configuration to one of the possible modes of operation in address . Depend-
ing on this configuration setting, only those parameters that are relevant to the select-
ed mode of operation will appear here. If the teleprotection supplement is not required,
address  is 7HOHSURW'LVW = 'LVDEOHG.
Note:
The “(&+26,*1$/” (F.No. 4246) must be separately assigned to the output relay(s)
for signal transmission, as it is not contained in the transmit signals “'LV76(1'” or
“'LV76(1'/”.
Dist. OFF/BLOCK
O/C OFF/BLOCK
T
Dis. PICKUP
&
S
R
Q
from rec. logic (Figure
6-48 or 6-50)
O/C PICKUP
≥1
&
>Dis.T.BlkEcho
ECHO only
OFF
ECHO and TRIP
„1“
≥1
≥1
 7LPH'(/$<
0
20 0
T

7ULS(;7(16,21
&
Echo release by earth fault
protection
(refer also to Figure 6-72)
&
CB open (3pole)
≥1
&
S
R
Q
ECHO SIGNAL
≥1
&
O/C VTsec lost
&
4040
ms
4246
)&7:HDN,QIHHG


Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English