Siemens siprotec 7SA6 User Manual page 458

Functions
TRIP L1
from Figure 6-141
L1 open
TRIP L2
from Figure 6-141
L2 open
TRIP L3
from Figure 6-141
L3 open
Trip Seal-in
(Reclosure
Lock-out)
6-276
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 $1' &% is set, the circuit-breaker auxiliary contact must send a message
that the circuit breaker is open. It is a prerequisite for this setting that the position of
the auxiliary contacts is allocated via a binary input.
Q‚yrÃPƒrÃ8ˆ……r‡
D
/
D
/
D
/
UHvÃUSDQÃ8H9
≥1
Figure 6-142 Latching and reset of the trip command
When tripping the circuit-breaker with a protection function reclosure must often be
locked until the cause for the protection function operation is found. 7SA6 therefore
provides the integrated reclosure lock-out function.
The lock-out state ("/2&.287") is realized by a RS flipflop which is protected against
auxiliary voltage failure (see Figure 6-143). The RS flipflop will be set via a binary input
"!/RFNRXW 6(7" (FNo ). With the output alarm "/2&.287" (FNo ), if
interconnected correspondingly, a reclosure of the circuit-breaker (e.g. for automatic
reclosure, manual close signal, synchronization, closing via control) can be blocked.
" "$
Reset Trip CMD
‚y’ÃD1
87hˆ‘ÃhqÃD1
Q‚yrÃPƒrÃ8ˆ……r‡Ã1
v‡uÃ87hˆ‘ÃhqÃ
Q‚yrÃPƒrÃ8ˆ……r‡Ã1
Q‚yrÃPƒrÃ8ˆ……r‡
v‡uÃ87hˆ‘Ãhq
Q‚yrÃPƒrÃ8ˆ……r‡Ã1
Q‚yrÃPƒrÃ8ˆ……r‡
v‡uÃ87hˆ‘ÃhqÃ
Q‚yrÃPƒrÃ8ˆ……r‡Ã1
&
!#
T
$&
FNr
S Q
Relay TRIP L1
R
&
$'
FNr
S
Q
Relay TRIP L2
R
&
$(
FNr
S
Q Relay TRIP L3
R
&
7SA6 Manual
C53000-G1176-C133-1