Siemens siprotec 7SA6 User Manual

Functions
6-276 7SA6 Manual
C53000-G1176-C133-1
tripping protection function resets very rapidly. Only after the last protection function
has reset (no function is picked up any more)
AND the minimum trip command
duration has expired, the trip commands can reset.
A further condition for the reset of the trip command is that the circuit breaker has
opened, in the event of single-pole tripping the relevant circuit-breaker pole. In the
function control of the device this is checked by means of the circuit-breaker position
feedback (Subsection 6.20.2) and the current flow.
The residual current 3ROH2SHQ&XUUHQW that is certainly undershot when the circuit
breaker pole is open is set in address $. Address  5HVHW7ULS&0'
determines under which conditions a trip command is reset. If &XUUHQW2SHQ3ROH is
set, the trip command is reset as soon as the current disappears. It is important that
the value set in address $ 3ROH2SHQ&XUUHQW (see above) is undershot. If
&XUUHQW$1'&% is set, the circuit-breaker auxiliary contact must send a message
that the circuit breaker is open. It is a prerequisite for this setting that the position of
the auxiliary contacts is allocated via a binary input.
Figure 6-142 Latching and reset of the trip command
Trip Seal-in
(Reclosure
Lock-out)
When tripping the circuit-breaker with a protection function reclosure must often be
locked until the cause for the protection function operation is found. 7SA6 therefore
provides the integrated reclosure lock-out function.
The lock-out state (“/2&.287”) is realized by a RS flipflop which is protected against
auxiliary voltage failure (see Figure 6-143). The RS flipflop will be set via a binary input
“!/RFNRXW6(7” (FNo ). With the output alarm “/2&.287” (FNo ), if
interconnected correspondingly, a reclosure of the circuit-breaker (e.g. for automatic
reclosure, manual close signal, synchronization, closing via control) can be blocked.
T
 70LQ75,3&0'
S
R
Q
&
TRIP L1
from the protection functions
≥1
L1 open
Relay TRIP L1
&
FNr



RQO\,
&%DX[DQG,
Reset Trip CMD
from Figure 6-141
,
/
ZLWK&%DX[DQG
S
R
Q
TRIP L2
L2 open
&
from Figure 6-141
,
/
ZLWK&%DX[DQG
S
R
Q
TRIP L3
L3 open
&
from Figure 6-141
,
/
ZLWK&%DX[DQG
Relay TRIP L2
FNr

Relay TRIP L3
FNr

3ROH2SHQ&XUUHQW
3ROH2SHQ&XUUHQW
3ROH2SHQ&XUUHQW
3ROH2SHQ&XUUHQW
3ROH2SHQ&XUUHQW
3ROH2SHQ&XUUHQW
3ROH2SHQ&XUUHQW

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English