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Functions
2.16 Function Logic
General Trip
All trip signals for the protection functions are connected by OR and generate the indication
This indication can be routed to LED or output relays.
Terminating the Trip Signal
A trip command once transmitted is stored (see
duration TMin TRIP CMD is started. It ensures that the command is transmitted to the circuit breaker for a
sufficient amount of time, even if the tripping protection function drops out very quickly. The trip commands
can only be reset after all tripping protection functions have dropped out and after the minimum trip
command time has elapsed.
A further condition for terminating the trip command is that the circuit breaker is recognized to be open. The
function control of the device checks this condition by means of the circuit-breaker position feedback (Section
"Detection of the Circuit-Breaker Position") and the flow of current. In address 1130 the residual current
PoleOpenCurrent is set which is certainly undershot when the circuit-breaker pole is open. Address 1135
Reset Trip CMD determines under which conditions a trip command is reset. If CurrentOpenPole is set,
the trip command is reset as soon as the current disappears. It is important that the value falls below the
setting in address 1130 PoleOpenCurrent (see above). If Current AND 52a is set, the circuit-breaker
auxiliary contact must also send a message that the circuit breaker is open. This setting requires the position
of the auxiliary contact to be routed via a binary input. If this additional condition is not required for resetting
the trip command (e.g. if test sockets are used for protection testing), it can be switched off with the setting
Pickup Reset.
[lo-ls-absteuer-ausloese-20101112, 1, en_US]
Figure 2-78
Reclosure Interlocking
After the circuit breaker has been tripped by a protection function, the reclosing must often be blocked until
the cause for tripping of the protection function has been found. 7SD80 enables this via the integrated reclo-
sure interlocking.
The interlocking state ("LOCKOUT") will be realized by an RS flipflop which is protected against auxiliary
voltage failure (see
output indication
for automatic reclosing, manual close signal, closing via control) can be blocked. The interlocking should only
be reset manually via binary input
mined.
178
Storage and termination of the trip command
Figure
2-79). The RS flipflop is set via binary input
LOCKOUT (no. 530), if interconnected correspondingly, reclosing of the circuit breaker (e.g.
>Lockout RESET (no. 386) when the cause of the fault has been deter-
Figure
2-78). At the same time, the minimum trip command
>Lockout SET (no. 385). With the
E50417-G1100-C474-A2, Edition 02.2018
Relay TRIP .
SIPROTEC 4, 7SD80, Manual
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